RU2770368C1 - Polypropylene-based composition with improved transparency, impact strength, and rigidity, intended for casting thin-walled products, method for producing such a composition, and products manufactured therefrom - Google Patents

Abstract

FIELD: polymers.SUBSTANCE: invention relates to a polypropylene-based composition for for producing cast products, containing, relative to the total weight of the composition, (A) 53.8 to 79.8 wt.% crystalline isotactic polypropylene, (B) 10 to 20 wt.% elastomer based on an ethylene copolymer with an α-olefin containing 4 to 10 carbon atoms, (C) 10 to 25 wt.% one or multiple homopolymers of ethylene and/or statistical thermoplastic copolymers of ethylene with α-olefins containing 3 to 10 carbon atoms, and (D) a modifying system including 0.04 to 0.64 wt.% (D1) organic peroxide and 0.04 to 0.64 wt.% (D2) coagent constituting a vinyl monomer with three or more functional acrylate groups, and (E) 0.05 to 1.0 wt.% nucleating agent, and optional additives. The composition is produced by a two-stage method including the stage of producing a modified composition of a concentrate by mixing and compounding components in a melt using mixing equipment and an extruder. The resulting polypropylene-based composition has an optimal balance of properties, in particular, increased fluidity, improved impact strength. and rigidity, as well as transparency. The invention also relates to an application of the polypropylene-based composition for manufacturing cast products, as well as to a product based on the resulting composition.EFFECT: creation of a polypropylene-based composition exhibiting an optimal balance of properties.65 cl, 29 ex, 2 tbl

Description

Field of technology to which the invention relates

The present invention relates to compositions based on polypropylene (PP), which have an optimal balance of properties, in particular, increased fluidity, improved toughness and stiffness, and transparency. Obtained in accordance with the claimed method, the composition based on polypropylene is intended for thin-walled casting of products used as packaging, and for storing various materials, including at low temperatures, for the manufacture of thin-walled containers for liquid and bulk materials, as well as for laminating various surfaces .

State of the art

It is known that for a composition based on polypropylene used for thin-walled casting products, important characteristics are: high fluidity and good mechanical properties, in particular stiffness and toughness. The requirement of fluidity is important to ensure high manufacturability of products based on the composition of polypropylene. The mechanical properties of the composition, such as stiffness and toughness, provide products with resistance to damage, for example, when mechanically squeezed or dropped.

In addition, an important requirement for a composition based on polypropylene are optical characteristics, namely transparency. However, often, an improvement in the optical properties of a composition based on polypropylene entails a deterioration in mechanical properties and vice versa. The high degree of crystallinity of polypropylene, which is part of the composition, provides products based on it with good mechanical properties, in particular rigidity, but at the same time has a negative effect on transparency. Reducing the degree of crystallinity, for example, by increasing the amount of comonomer contained in the propylene copolymer, improves the optical properties of the composition and products based on it, however, there is a significant deterioration in rigidity. In this regard, it is important to maintain the optimal ratio between the mechanical and optical properties of the resulting composition.

From the prior art compositions based on polypropylene are known, products from which are characterized by transparency. For example, CN 103709518 discloses a composition based on a random copolymer of propylene with a content of propylene units from 87 to 99 wt.%. As a comonomer, ethylene is used, introduced into the composition of the copolymer in an amount of from 0.5 to 3.5 wt.%, and α-olefin containing from 4 to 8 carbon atoms, in an amount of from 0.5 to 9.5 wt.% . The composition also contains a nucleating agent, which is used as sorbitol derivatives or aromatic phosphates. The melt flow index (MFR) of the composition ranges from 0.5 to 20 g/10 min. The composition is characterized by good transparency: the value of turbidity is less than 10%, however, it does not have the required level of impact-strength characteristics in some cases, especially at low temperatures and at high MFR.

In a number of patents described below, formulation and technological solutions are disclosed that make it possible to increase the impact strength of a composition based on polypropylene, including at low temperatures, while maintaining optical properties (transparency). This balance of mechanical and optical properties is achieved by a composition based on a binary mixture of a highly crystalline propylene (co)polymer with an elastomer, where the elastomer has good compatibility with the propylene (co)polymer and is a predominantly amorphous propylene copolymer with a relatively high content of ethylene comonomer or α- olefin containing from 4 to 8 carbon atoms. The preparation of such copolymers is often carried out using metallocene catalytic systems in two- or multi-stage reactor technology.

For example, patent RU 2337114 presents a composition based on propylene copolymers for the manufacture of fibers, films or molded articles. The composition consists of components A and B obtained in separate reactors in the presence of a metallocene catalyst system. Component A is an isotactic propylene homopolymer. Component B is a propylene copolymer containing 12 to 18% by weight of ethylene. Also, the composition may optionally contain other additives such as stabilizers, lubricants, nucleating agents, antistatic agents, dyes and pigments. It is noted that components A and B are present as separate phases, the mass ratio of A and B is from 80:20 to 60:40. The presented composition is characterized by high transparency (turbidity not more than 30%) and Charpy impact strength s / n at room temperature (23 ° C) - from 41.3 to 49.4 kJ / m ² and at 0 ° C - from 12, 6 to 28.9 kJ/m ² . However, at a lower temperature, equal to -20°C, the value of the index of impact strength is sharply reduced to values from 2.1 to 2.6 kJ/m ² . Another disadvantage of the composition is the low modulus of elasticity in tension: from 602 to 609 MPa.

US Pat. No. 8,618,220 presents a binary composition which is characterized by an increased modulus of elasticity. Said composition consists of a propylene homopolymer (A), a propylene copolymer (B) containing 10 to 35% by weight of an olefin other than propylene, and optionally additives. According to the claimed invention, the increase in the modulus of elasticity is achieved by expanding the intervals of varying the content of component B and the content of olefin in the propylene copolymer. Here, the propylene homopolymer and the propylene copolymer are produced using a Ziegler-Natta catalytic system. The increased values of the modulus of elasticity of the polypropylene composition, reaching the level of 1100 MPa, however, have a negative effect on the value of impact strength, which is from 3.5 to 9.0 kJ/m ² at 23°C, and from 2 to 5 kJ/m ² at 0°C.

Patent RU 2528425 also presents a binary composition based on polypropylene with improved transparency, as well as a method for obtaining such a composition by polymerization in a reactor or by extrusion technology. This composition includes: (A) from 60 to 90 wt.% of a crystalline propylene copolymer containing from 3.5 to 10.0 wt.% of units formed by ethylene, and (B) from 10 to 40 wt.% of a propylene copolymer containing from 18.5 to 23.5 wt.% links formed by ethylene. The MFR of the composition ranges from 3 to 20 g/10 min. At the same time, the values of impact strength according to Izod s/n are relatively small and range from 33.8 to 51.0 J/m at 23°C, from 9.9 to 45 J/m at 0°C, and from 3.3 up to 4.9 J/m at 20°C. In addition, the composition is characterized by small values of the modulus of elasticity: from 500 to 700 MPa.

Thus, a common disadvantage of binary compositions based on a mixture of polypropylene and its copolymers with ethylene and other α-olefins of various compositions and microstructures is the difficulty in obtaining a good balance of parameters such as fluidity, impact strength, and rigidity while maintaining optimal optical properties (transparency). One of the possible ways to solve this problem, known from the prior art, is to use a binary heterophase mixtures of isotactic polypropylene and ethylene-α-olefin elastomer. However, to obtain compositions characterized by transparency, a certain combination of the structure and properties of both phases of these components is required.

Thus, patent EP 0603723 claims a heterophasic composition based on polypropylene with good optical and improved impact properties. This composition includes: (A) from 70 to 98 wt.% crystalline homopolypropylene or propylene copolymer containing from 0.5 to 10.0 wt.% units of ethylene or other olefin other than propylene; and (B) from 2 to 30 wt.% of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms. It is noted that the content of ethylene in the composition of the copolymer (B) can vary from 60 to 85 wt.%. In this case, the xylene-soluble fraction should have an intrinsic viscosity in the range from 0.8 to 1.1 dl/g.

A technically similar solution is proposed in patent RU 2043373, which discloses the composition and method for producing a polypropylene composition with improved transparency and impact strength. The composition includes: (A) from 87.0 to 92.5 wt.% of a crystalline copolymer of propylene and ethylene and (B) from 7.5 to 13.0 wt.% of an elastomer based on a copolymer of ethylene and C ₃ -C ₄ -α -olefin. The composition is obtained by two-stage copolymerization. The content of ethylene units introduced in the second stage of copolymerization using titanium-magnesium catalysts varies from 25 to 68.5 wt.%. Additional conditions are certain intrinsic viscosities of the xylene-soluble fractions of components A and B, as well as a certain ratio of the content of ethylene units in the elastomeric, xylene-soluble ethylene copolymer. A nucleating agent is additionally added to the composition. The properties of the composition, however, are not too high: the Izod impact strength s/n is 118 J/m at 23°C and from 30.4 to 45.0 J/m at 0°C, the modulus of elasticity is from 780 to 880 MPa .

The solution aimed at obtaining a composition with an optimal balance of mechanical and optical properties is presented in patent RU 2315069. The content of the elastomer included in the composition is increased to values from 30 to 45 wt.%, while the content of the fraction soluble in xylene is not more than 35 wt.%, preferably not more than 30 wt.%. The resulting composition is characterized by a combination of high fluidity and impact strength, expressed in terms of the transition temperature from plastic to brittle fracture, and impact strength in the Izod s/n test. Thus, impact strength at room temperature for such a composition reaches a value of 39.5 kJ/m ² . The brittle-plastic transition temperature of the composition is not more than -35°C. MFR composition ≥ 15 g/10 min. The disadvantage of the composition is the low value of the modulus of elasticity in bending: from 600 to 770 MPa.

Patent EP 2471858 presents a composition of a more complex composition, including: (A) from 30 to 60 wt.% homopolypropylene; (B) from 30 to 60 wt.% random copolymer of propylene with α-olefins containing from 4 to 8 carbon atoms; (C) from 2 to 15 wt.% elastomer based on a copolymer of ethylene with α-olefins containing from 4 to 8 carbon atoms; (D) an ethylene homo- or copolymer having a density of 0.905 to 0.920 g/cm ³ ; and (D) 0.001 to 1.0% by weight of a nucleating agent. The composition is obtained by multi-stage technology in several reactors. The resulting composition has an elastic modulus from 100 to 1600 MPa. The disadvantage of this composition is the low impact strength (Charpy s/n), component at room temperature from 4 to 7 kJ/m ² and from 2.5 to 3.0 kJ/m ² at 0°C.

Wider possibilities for varying the structure and properties of shock-resistant and transparent compositions based on polypropylene are provided by the use of a three-component composition of the compositions. Thus, US Pat. No. 8,779,064 proposes a composition and method for producing a polypropylene composition with good toughness and transparency. The composition of the composition is a mixture of three components of different structure and properties. The main component (A), which is part of the composition in an amount of from 50 to 95 wt.%, is a propylene random copolymer containing from 0.5 to 10 wt.% of ethylene or other α-olefin. Its production is carried out in a suspension technology reactor on Ziegler-Natta catalytic systems or metallocene catalysts. Further, the reaction mass obtained in the specified reactor is sent to another reactor, in which component B is obtained at the second stage, the content of which in the final composition can vary from 5 to 49 wt.%. Component B is an elastomer based on a propylene copolymer containing 20 to 70% by weight of ethylene and/or butene units. Next, the obtained product (A+B) is mixed with the component (C) by means of extrusion processing. Component (C) is a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and its content in the composition is from 1 to 45 wt.%. The density of component C can vary from 0.870 to 0.955 g/cm³Thus, both amorphous elastomers and plastomers and more crystalline thermoplastic (co)polymers of ethylene (LLDPE, MDPE and HDPE) can be used. The composition may also contain nucleating additives and other conventional additives. The required properties of the composition are achieved by varying the number of components (A + B + C) in the mixture, the ratio of their viscosities, as well as the nature of each component. The properties of the compositions obtained in the examples of a specific implementation of the invention vary in the following ranges: MFI from 2.4 to 2.6 g/10 min., modulus of elasticity in bending from 930 to 1000 MPa, impact strength according to Izod s/n from 550 to 570 J/m at 23^aboutC, and from 28 to 30 J/m at -20°C. The disadvantage of the composition is the complex method of its preparation, as well as low fluidity and insufficiently high impact strength at low temperatures.

Another, more simplified technological approach, which consists in obtaining by extrusion technology three-component compositions of compositions based on polypropylene with improved transparency and toughness, is described in patent EP 0557953. The composition includes (A) a highly crystalline random copolymer of propylene with ethylene and/or α-olefin , with 4 to 8 carbon atoms. This copolymer contains from 85 to 99 wt.% propylene, from 1 to 5 wt.% ethylene, from 1 to 6 wt.% α-olefin. The density of the copolymer (A) can vary from 0.885 to 0.910 g/cm ³ . Component (B), the content of which in the composition is from 40 to 75 wt.%, is a binary mixture of elastomer (B1) based on a copolymer of ethylene with an α-olefin containing from 3 to 8 carbon atoms, with a density of 0.855 to 0.865 g /cm ³ (Mooney ML(1+4) ₁₂₅ ^o from 10 to 100 relative units) and component (B2), which is a polyethylene thermoplastic (LDPE, LLDPE or HDPE or a mixture thereof) with a density of 0.910 to 0.965 g/cm ³ . A necessary condition for obtaining transparent compositions is compliance with the ratio of densities: d _B1 /d _B2 =0.980-1.015. The disadvantage of the proposed compositions is not enough good balance between impact strength and modulus of elasticity. At a brittle-plastic transition temperature of the compositions less than -40°C, ^the modulus of elasticity ranges from 200 to 600 MPa. When the achieved values of the modulus of elasticity more than 600 MPa, the brittle-plastic transition temperature of the composition increases sharply to -15°C.

The closest in technical essence to the claimed invention is patent EP 2338657, which discloses a polypropylene-based composition with an improved balance of impact strength and transparency, intended for use as a film material or for thin-walled molded products used for packaging and storing frozen foods. In accordance with the said invention, a multicomponent composition is proposed comprising a mixture of highly crystalline components: (A) from 30 to 60 wt.% of homopolypropylene; (B) from 10 to 50 wt.% random copolymer with a content of comonomers up to 5 wt.%; (C) from 1 to 20 wt.% of a mixture of two different elastomers based on ethylene copolymers, differing in the content of ethylene units and viscosity; (D) from 5 to 25 wt.% homo - or random thermoplastic copolymer of ethylene with a density of from 0.905 to 0.925 g/cm ³ . The mixing of all these components is carried out in the melt. The resulting composition is characterized by the following properties: MFI ≥ 20 g/10 min, Charpy impact strength s/n from 7.0 to 12.0 kJ/m ² (from ~70 to ~120 J/m) at 23°C, from 1.8 to 4.0 kJ/m ² (from ~18 to ~40 J/m) at -20°C, turbidity of casting samples 2 mm thick from 70 to 80%. The disadvantages of this composition include the complexity of the composition and insufficiently high impact strength, both at room and at low temperatures.

As follows from the prior art, the main problem of the proposed solutions remains the unattainability of the optimal balance of the fundamental characteristics of compositions based on polypropylene used to produce packaging films, containers and other thin-walled molded products. Thus, there is a need to obtain a composition based on polypropylene, which, while maintaining good impact strength, including at low temperature, has improved fluidity, that is, a high melt flow rate, as well as high rigidity and transparency.

The objective of the present invention is to obtain a composition based on polypropylene, which is characterized by high fluidity and an optimal combination of mechanical and optical properties, in particular stiffness, impact strength and transparency.

Technical result of the present invention is to improve the impact-strength and physico-mechanical properties of the composition based on polypropylene while maintaining optimal optical properties, namely transparency. Thus, the impact strength of the composition based on polypropylene according to Izod s / n is increased to values from 150 to 517 J / m at 23^aboutC, and from 41 to 52 J/m at -20°C. In addition, the composition has increased rigidity, expressed in terms of the flexural modulus, which ranges from 910 to 1200 MPa. At the same time, the melt flow index of the composition is at a level of at least 20 g/10 min.

An additional technical result consists in simplifying the composition of the composition relative to the prototype, which makes the method of obtaining the composition more efficient.

To achieve the technical result according to the present invention, it is essential:

1) the use in the composition of polymer components selected from crystalline isotactic polypropylene, an elastomer based on an ethylene copolymer and a thermoplastic polymer based on ethylene and/or its copolymer;

2) the use in the composition of the modifying system based on organic peroxide and coagent, which is a vinyl monomer with three or more functional acrylate groups; and

3) use of a nucleating agent.

The specified technical result, which consists in achieving the greatest transparency, is achieved by using an elastomer and a thermoplastic polymer at such a mass ratio relative to each other, at which the density of their mixture will be close or equal to the density of isotactic polypropylene, while the elastomer content in the composition should not be less than 10 wt.%. In addition, high transparency values of the composition are provided when using a nucleating agent, preferably a "clarifier".

The required flow characteristics and, at the same time, high impact strength and stiffness values are achieved through the use of crystalline isotactic polypropylene, as well as through the chemical modification of polymer components with a modifying system that includes an organic peroxide and a vinyl monomer coagent with three or more functional acrylate groups.

At the same time, in order to maintain the optimal ratio between the optical and mechanical properties of the composition, its preparation must be carried out in a two-stage method, including the stage of obtaining a modified concentrate composition and the subsequent stage of mixing the resulting concentrate with a nucleating agent and, optionally, other additives, where crystalline isotactic polypropylene used in the first stage , and polypropylene used in the second stage, differ from each other in terms of melt flow.

Description of the invention

In accordance with the present invention, a composition is claimed containing in relation to the total mass:

(A) from 53.8 to 79.8 wt.% crystalline isotactic homopolypropylene,

(B) from 10 to 20 wt.% of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and

(C) from 10 to 25 wt.% of one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms, and

(D) modifying system, which includes (D1) from 0.04 to 0.64 wt.% organic peroxide, (D2) from 0.04 to 0.64 wt.% coagent, which is used as a vinyl monomer with three or more acrylate functional groups, and

(E) from 0.05 to 1.0 wt.% nucleating agent and, optionally, other additives.

In this case, crystalline isotactic polypropylene (A) is a mixture of polypropylenes (A΄) and (A΄΄), differing in the values of the melt flow index. In accordance with the present invention, two crystalline isotactic polypropylenes (A΄) and (A΄΄) are used with melt flow rates (A΄) from 2.0 to 4.0 g/10 min, preferably from 2.5 to 3, 5 g/10 min, and (A΄΄) 20 to 40 g/10 min, preferably 25 to 35 g/10 min.

The weight ratio of the isotactic polypropylenes (A') and (A΄΄) according to the invention is from 0.1 to 9, preferably from 0.25 to 4, most preferably from 0.75 to 3.5, so that the content of (A ΄) + (A΄΄) was equal to the content of (A), i.e. the total amount of A= (A΄) + (A΄΄) relative to the total weight of the composition ranged from 53.8 to 79.8 wt.%, preferably from 58.2 to 79.7 wt.%, most preferably from 63 .7 to 79.6 wt.%.

The elastomer (B) is a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, preferably obtained using metallocene catalyst systems. Preferably, an ethylene-octene-1 copolymer is used. Said elastomer has a density of 0.855 to 0.890 g/cm ³ , preferably 0.857 to 0.885 g/cm ³ , and a melt flow index (MFR _190/2.16 ) of 1 to 30 g/10 min.

The content of the elastomer (B), based on 100% by weight of the composition, is 10 to 20% by weight, preferably 10 to 17% by weight, most preferably 10 to 15% by weight.

Component (C), which is part of the claimed composition, includes one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms. The density of said ethylene homo- or copolymer is 0.910 to 0.965 g/cm ³ , preferably 0.915 to 0.960 g/cm ³ , MFR _190/2.16 is 0.1 to 10 g/10 min, preferably 0.3 up to 8 g/10 min. Thus, as component (C) can be used any of the base grades of industrial polyethylene that meet the above requirements, selected from low density polyethylene LDPE (LDPE), linear low density polyethylene LLDPE (LLDPE), linear medium density polyethylene LLDPE (LMDPE ) and high density polyethylene HDPE (HDPE).

In the present invention, polyethylene obtained by the mechanism of radical-chain initiation of ethylene polymerization at high pressure (up to 2000 atm and more) in tubular or autoclave type reactors is used as LDPE. The LDPE included in the claimed composition is characterized by a melt flow index (MFR _{190 ° C / 2.16 kg} ) from 0.1 to 10 g / 10 min, preferably from 0.2 to 10 g / 10 min, more preferably from 0.3 to 5 g/10 min and has a density of 0.910 to 0.935 g/cm ^{3 ,} preferably 0.910 to 0.930 g/cm ³ , more preferably 0.915 to 0.925 g/cm ³ .

As LLDPE and LPESP, polyethylene is used, obtained by the anion-coordination copolymerization of ethylene with α-olefins containing from 4 to 10 carbon atoms, at low pressure on Ziegler-Natta catalysts, or using metallocene catalytic systems according to standard industrial technologies. The LLDPE included in the claimed composition is characterized by a melt flow index (MFR_{190°C/2.16kg}) 0.1 to 10 g/10 min, preferably 0.3 to 10, more preferably 0.5 to 5 g/10 min and has a density of 0.910 to 0.927 g/cm³, preferably 0.915 to 0.925 g/cm³. Melt flow index (MFR_{190°C/2.16kg}) The LPESP is 0.1 to 10 g/10 min, preferably 0.3 to 10, more preferably 0.5 to 5 g/10 min, and has a density of 0.930 to 0.940 g/cm³, preferably 0.930 to 0.935 g/cm³.

As LLDPE and LPESP, according to the present invention, copolymers of ethylene with an α-olefin containing from 4 to 10 carbon atoms, for example, with an α-olefin selected from the group including butene-1, hexene-1, octene-1 and other α-olefins. Most preferred is an ethylene-octene-1 copolymer. The content of α-olefin comonomer in LLDPE and LPESP is from 2.5 to 8 wt.%, preferably from 3 to 6 wt.%, most preferably from 3.5 to 5 wt.%.

As HDPE in the present invention, polyethylene is used, obtained by the anionic-coordination copolymerization of ethylene with higher α-olefins containing from 4 to 10 carbon atoms, at low pressure on Ziegler-Natta catalysts, or using metallocene catalyst systems. according to standard industrial technologies. Included in the claimed composition of HDPE are characterized by the melt flow rate (MFR_190°C/5kg) 0.1 to 5 g/10 min, preferably 0.3 to 5 g/10 min, more preferably 0.5 to 5 g/10 min and have a density of 0.945 to 0.965 g/cm³, preferably 0.950 to 0.960 g/cm³.

The content of component (C) in the composition relative to the total weight of the composition is 10 to 25 wt.%, preferably 10 to 23 wt.%, most preferably 10 to 20 wt.%.

To achieve the best technical result, the contents of components (B) and (C) vary within the declared ranges in such a way that:

1) the concentration of elastomer (B) in the composition of the claimed composition was at least 10 wt.% and

2) the density of the mixture of elastomer (B) and ethylene homopolymer and/or its thermoplastic copolymer with α-olefin containing from 4 to 10 carbon atoms (C) was close to or equal to the density of isotactic polypropylene (A), i.e. that the density (B +C) was not less than 0.995, preferably not less than 0.997 of the density of the polypropylene (A), and not more than 1.007, preferably not more than 1.005 of the density of the polypropylene (A).

To ensure an optimal balance of properties, the claimed composition necessarily includes a modifying system (D) containing, based on the total weight of the composition, from 0.04 to 0.64 wt.% organic peroxide (D1), from 0.04 to 0.64 wt. .% coagent (D2), which is a vinyl monomer with three or more functional acrylate groups. The use of said modifying system, according to the Applicant, provides, in particular, improved distribution of the elastomer phase (B) and ethylene homopolymer and/or ethylene random thermoplastic copolymer (C) in the isotactic polypropylene matrix (A) due to the chemical interaction of all three polymer components.

Organic peroxide (D1) is selected from tert-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, di-tert-butyl peroxide, tert-butylcumene peroxide, dicumyl peroxide, 1,3-1,4-bis-(tert-butylperoxyisopropyl)benzene, acetyl peroxide , benzoyl peroxide, isobutyryl peroxide, bis-3,5,5-trimethylhexanoyl peroxide, methyl ethyl ketone peroxide and other peroxides.

Preferably, organic peroxides are used as individual components, since peroxide concentrates on inorganic and polymeric carriers can reduce the transparency of the resulting composition.

The content of organic peroxide in relation to the total weight of the composition is from 0.04 to 0.64 wt.%, preferably from 0.08 to 0.48 wt.%, most preferably from 0.1 to 0.40 wt.%.

Coagent (D2) is a vinyl monomer with three or more functional acrylate groups. As such a monomer, pentaerythritol tetraacrylate, sorbitan hexaacrylate, xylitol pentaacrylate, glycerol triacrylate, trimethylol propane triacrylate, preferably trimethylol propane triacrylate (TMPTA) are used. Mono- and di-functional ether, amide and other derivatives of acrylic monomers do not allow to achieve the desired technical result, as well as polyfunctional monomers of a different nature, for example, such as triallyl isocyanurate (TAIC), 1,3,5-trivinylcyclohexane and the like.

The content of coagent D2 relative to the total weight of the composition is from 0.04 to 0.64 wt.%, preferably from 0.08 to 0.48 wt.%, even more preferably from 0.1 to 0.40 wt.%.

To ensure greater transparency, in addition to the polymer components (A, B and C) and the modifying system (D), the claimed composition includes (E) a nucleating agent in an amount of from 0.05 to 1.0 wt.%, preferably from 0.1 to 0.8 wt.%, most preferably from 0.2 to 0.5 wt.%, as well as other optional additives. In accordance with the present invention, the nucleating agent is of an organic nature. A mixture of nucleating agents may be used.

The most preferred nucleating agent are dibenzylidene sorbitol derivatives, which are also known as "clarifiers". In particular, the nucleating agent is selected from 3,4-dimethyldibenzylidene sorbitol, bis(4-propylbenzylidene) propyl sorbitol and the like.

The composition of the present invention may also include optional additives other than nucleating agents, such as, for example, antioxidants, heat stabilizers, stabilizers, and mixtures thereof. The content of such additives in the composition is preferably from 0 to 0.3 wt.%.

Examples of suitable antioxidants are 2,6-di-tert-butyl-p-cresol, tetrakis-[methylene-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]methane, and ester 3,5 -di-tert-butyl-4-hydroxy-phenylpropionic acid and pentaerythritol under the trademark Irganox 1010.

Examples of suitable heat stabilizers and light stabilizers include tri-(phenyl-2,4-di-tert-butyl)phosphite, known under the trade name Irgafos 168, and/or similar heat stabilizers from other trade names, as well as hindered amine type light stabilizers and blending systems. stabilizers known under such trademarks as Irganox B225, Irganox B215.

The composition according to the invention is obtained by mixing all the components using known methods of mixing thermoplastic materials, for example, extrusion or mixing in mixers of various designs. Closed mixers with blades or rotors, single-screw extruders, extruders with two screws rotating in the same or opposite directions are used.

In accordance with the present invention, the composition is obtained by mixing the components and then melt compounding the resulting mixture using equipment known in the art, for example, mixing equipment (Banbury mixers, Brabender mixers), single screw, twin screw extruder and other similar mixers. Preferably, mixing is carried out in a mixing equipment, and further compounding of the resulting mixture is carried out in an extruder.

At the same time, compounding in the present invention is understood as a technological process of mixing polymers and additives in order to obtain a composition with homogeneously mixed components.

The authors of the present invention unexpectedly found that mixing all the components of the composition in one stage negatively affects the operation of the modifying system and the nucleating agent - clarifier, which does not lead to the achievement of the required level of transparency of the resulting compositions. Thus, the use of a modifying system and a nucleating agent in the same step is undesirable, so the composition according to the present invention is obtained in a two-step process, including the step of obtaining a modified concentrate composition, as described below.

I stage. Preparation of the concentrate composition

Mixing (B) of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and (C) one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms carbon, with (A΄) crystalline isotactic polypropylene.

At the same time, the mixing of these components (A + B + C) is carried out in the presence of a modifying system (D), including (D1) organic peroxide, taken in an amount of from 0.1 to 0.8 wt%, and (D2) a coagent, as which use a vinyl monomer with three or more functional acrylate groups, taken in an amount of from 0.1 to 0.8 wt.%.

Mixing of the components is carried out in a mixing equipment for a period of time from 1 to 20 minutes, preferably from 2 to 10 minutes at a temperature of from 10 to 50°C, preferably from 20 to 40°C. Next, the resulting mixture is compounded in the melt, preferably in an extruder, at a temperature of from 190 to 240°C., preferably from 220 to 230°C. The number of revolutions of the screw is approximately 250 min ^-1 .

II stage. Obtaining a composition based on polypropylene

The concentrate composition obtained in stage I, taken in an amount of from 40 to 80 wt.%, preferably from 50 to 70 wt.%, is mixed with (A΄΄) crystalline isotactic polypropylene and (E) a nucleating agent and, optionally, other additives .

Mixing of the components is carried out in a mixing equipment for a period of time from 1 to 20 minutes, preferably from 2 to 10 minutes at a temperature of from 10 to 50°C, preferably from 20 to 40°C. Next, the resulting mixture is compounded in the melt, preferably in an extruder, at a temperature of from 190 to 240°C., preferably from 220 to 230°C. The number of revolutions of the screw is approximately 250 min ^-1 .

In this case, as isotactic crystalline polypropylene, polypropylene A΄ in the first stage and A΄΄ in the second stage are preferably used, which differ from each other in the values of the melt flow index. The A΄ is polypropylene with a melt flow index of 2.0 to 4.0 g/10 min, preferably 2.5 to 3.5 g/10 min. The A΄΄ is polypropylene with a melt flow index of 20 to 40 g/10 min, preferably 25 to 35 g/10 min. (A΄) and (A΄΄) are used in their mass ratio of 0.1 to 9, preferably 0.25 to 4, most preferably 0.75 to 3.5, so that the total content of (A ΄ + А΄΄) was equal to A, i.e. the total amount (A΄ + A΄΄) in relation to the total weight of the composition ranged from 53.8 to 79.8 wt.%, preferably from 58.2 to 79.7 wt.%, most preferably 63.7 to 79, 6 wt%.

Without wishing to be bound by any theory, the authors of the present invention believe that the use of polypropylenes, differing in the melt flow index, provides the formation of an interfacial layer of a certain morphology during the modification of a dispersed heterophasic mixture of components (A) and (B). The modified products of the composition polypropylene-coagent-elastomer thus formed must have a high level of molecular weight characteristics in order to ensure the stability, uniformity and high density of the spatial network of physical entanglements of macrochains in the dispersed system of polypropylene (A΄) and elastomer (B) at the first stage of production compositions. When using more highly fluid grades of polypropylene in the first stage, it is impossible to provide the necessary balance of impact resistance, fluidity and rigidity of the resulting composition. At the same time, to ensure the required level of fluidity, polypropylene (A΄΄) with a higher melt flow rate (MFR) is used at the second stage of obtaining the composition.

As components (A), (B), (C), (D), (E) in the preparation of the composition, the compounds described earlier are used. At the same time, the content of these components in the process of obtaining the composition is varied in such a way that the resulting composition satisfies the declared quantitative composition, namely, it contains:

(A) from 53.8 to 79.8 wt.% crystalline isotactic polypropylene,

(B) from 10 to 20 wt.% of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and

(C) from 10 to 25 wt.% of one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms, and

(D) modifying system, which includes (D1) from 0.04 to 0.64 wt.% organic peroxide, and from 0.04 to 0.64 wt.% coagent (D2), which is used as a vinyl monomer with three or more functional acrylate groups, and

(E) from 0.05 to 1.0 wt.% nucleating agent, as well as other optional additives.

As mentioned earlier, in order to achieve the best technical result, the mass ratio of components (B) and (C) is varied so that the density of the mixture of elastomer (B) and homopolymer (C) of ethylene and / or its thermoplastic copolymer with α-olefin containing from 4 to 10 carbon atoms, is close to or equal to the density of isotactic polypropylene (A), that is, it is necessary that the density (B + C) is not less than 0.995, preferably not less than 0.997 of the density of polypropylene (A), and not more than 1.007, preferably not more than 1.005 of the density of the polypropylene (A). In this case, the concentration of the elastomer (B) in the composition should be at least 10 wt.%.

The compositions of the present invention are preferably used as a material for the manufacture of molded articles, preferably injection molded articles. Even more preferred is the use of the compositions of the present invention for the manufacture of thin walled containers and packaging products such as plastic cups, household items and food packaging.

The present invention also relates to articles made from the composition of the invention; preferably, such products are produced by injection molding.

The invention will be further explained by examples, which are given to illustrate the present invention and are not intended to limit its scope.

EXAMPLES OF CARRYING OUT THE INVENTION

Test Methods

The determination of the melt flow index (MFR) at a temperature of 230 ^about C and a load of 2.16 kg is performed according to ASTM D 1238-04C.

Samples for physical and mechanical testing are made by injection molding according to ASTM D 4101. The injection molding modes on an Engel Victory 200/50 injection molding machine are as follows:

- injection volume - 31 cm ³

- transition point - 3.5 cm ³

- temperature by zones - 230-230-225-220°C

- mold temperature - 35°С

- dosing speed - 0.06 m/s

- injection speed -100 cm ³ / s

- injection pressure - 800 bar

- speed pressure - 50 bar

- back pressure - 400 bar

- exposure time under pressure - 20 s

- cooling time - 30 s.

Determination of notched Izod impact strength (s/n) at a temperature ^of 23° C. and minus 10° C. is performed according ^to ASTM D 256, (test type A).

Determination of turbidity and transparency for samples with a thickness of 1 and 2 mm is performed according to ASTM D1003.

Determination of tensile yield strength and relative strain at yield strength is performed according to ASTM D 638.

Determination of the flexural modulus is performed according to ASTM D 790, test type: three-point bending, test speed 1.3 mm/min.

Components used in the examples

Examples of suitable polypropylenes (A΄) include commercially available products known under the trademarks PPH 030 GP manufactured by Tomskneftekhim LLC, Tobolsk-Polymer LLC, Poliom LLC, NPO Neftekhimiya, Balen 01030 manufactured by Ufaorgsintez OJSC , PP 1500J manufactured by Nizhnekamskneftekhim LLC, etc. Examples (А΄΄) may be products known under the trademarks РРН 270 GP manufactured by Tomskneftekhim LLC, Tobolsk-Polymer LLC, Poliom LLC, NPO Neftekhimiya , Balen 01270 manufactured by OJSC Ufaorgsintez, PP 1300R manufactured by LLC Nizhnekamskneftekhim and the like. In particular, as a crystalline isotactic homopolypropylene (A ) use:

PPH030GP manufactured by Tomskneftekhim LLC, (MFR _{230°С/2.16=} 3 g/10 min),

PPH350FF manufactured by Tomskneftekhim LLC, (MFR _{230°С/2.16=} 25 g/10 min),

PPH270GP manufactured by Tomskneftekhim LLC, (MFR _{230°С/2.16=} 27 g/10 min).

Examples of suitable elastomers (B) are commercially available products known under such trademarks as, for example, Engage 8452, Engage 8842, Engage 8137, Exact 8210. In particular, as the elastomer (B) in the present invention, use:

Engage 8452, 8842, 8137 - ethylene-octene copolymer produced by Dow Chemical,

Exact 8210 is an ethylene-octene copolymer produced by ExxonMobil,

EPDM R563 is a ternary copolymer of ethylene, propylene and a diene.

As LDPE, any well-known LDPE brands can also be used.

Examples of suitable thermoplastic copolymers of ethylene with α-olefins (component (C)) include low density polyethylenes (LDPE), such as, for example, PE 15303-003, PE 15803-020, PE 10803-020, PE 11503-070, PE 16803 -070, Novex 20P730, LDPE 19N430, CA 8200, MA 8200, or mixtures thereof; linear low density polyethylenes (LLDPE), such as XP 9400, XP 9200, XP 9100, 3306WC4, PE 5118Q, UF414C4, 3840, SABIC LLDPE 318B, SABIC LLDPE 6318 BE, SABIC LLDPE R500035, or mixtures thereof, or linear medium density polyethylenes (LMESP), such as, for example, DOWLEX 5066, Lumicene M3410 EP, or a mixture thereof; as well as high density polyethylenes (HDPE), for example, PE 6948C, HDPE-276-73, HDPE 273-83, SABIC HDPE B5205, SABIC HDPE B5429, SABIC HDPE F04660, HDPE PE30T-49, or a mixture thereof.

In particular, within the scope of the present invention, the use of ethylene with α-olefins (C) as thermoplastic copolymer is preferred:

Daelim XP 9200, 9400 - low density metallocene linear polyethylene,

LDPE 153 - low density polyethylene produced by Tomskneftekhim LLC,

PEND276-73 - low-pressure polyethylene produced by Tomskneftekhim LLC.

Examples of suitable peroxides are those known under the trademarks Trigonox 301, Luperox DCP, Luperox DI, Luperox DTA, Luperox F, Luperox 101, Luperox 801. In particular, Trigonox 301 is preferably used as the organic peroxide (D1) in the practice of the present invention. - cyclic peroxide manufactured by AkzoNobel. Trimethylpropane triacrylate (TMPTA), 1,4-butanediol dimethacrylate (BDDMA), and triallyl isocyanurate (TAIC) are used as coagent (D2).

Examples of nucleating agents suitable for use in the compositions of the present invention include products known under the trademarks Millad 3988, Millad 8000, in particular Millad 8000, a clarifier manufactured by Milliken, is used as the nucleating agent (E).

Example 1 (comparative).

I stage. In a paddle mixer, a mixture is prepared according to the formula of the concentrate composition (K-1) shown in Table 1. The ratio of the elastomeric component (B) and the polyethylene thermoplastic (C) is selected so that the density of the mixture (B+C) is 0.900 g/cm ³ . Then the polymeric components A+(B+C), the organic peroxide (D1) and the coagent (D2) are mixed for 2 to 10 minutes at room temperature. The resulting mixture is then processed in a twin-screw extruder LTE-20-44 at a maximum temperature in the cylinder zones of 230°C and a screw speed of 250 min ^-1 . The granulate obtained on the line of this extruder is further used at the second stage of obtaining the composition.

II stage. In a paddle mixer, a mixture is prepared according to the recipe given in Table 2, and mixing is carried out for 2-10 minutes at a temperature ^of 20-50 ° C. For a more uniform distribution of additives (nucleating agent and other possible additives) in the mass of the composition, it is possible to optionally, apply liquid paraffin in an amount up to 0.2 wt.% The resulting mixture of components is processed in a twin-screw extruder LTE-20-44 at a maximum temperature in the cylinder zones of 210°C and a screw speed of 250 min ^-1 . The dry granulate obtained on the LTE-20-44 extruder line of the second stage is used further to determine the values of MFR _230/2.16 and to obtain samples by injection molding for subsequent physical-mechanical and optical-physical tests.

The results of all tests of the obtained compositions are shown in Table.2.

Example 2

Carried out according to Example 1, except that 60.0% of the modified concentrate K-1 is dosed at stage II. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 155 J/m and 42 J/m, respectively. Haze of 2 mm sample=74.1%.

Example 3

Carried out according to Example 1, except that in stage II metered 70.0% of the modified concentrate K-1. The results of all tests are shown in Table 2. The composition obtained has Izod s/n impact strengths at +23°C and -20°C of 486sh J/m (hinged fracture) and 48 J/m, respectively. Haze of 2 mm sample=75.4%.

Example 4

Carried out according to Example 1, except that in stage II metered 80.0% of the modified concentrate K-1. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 517sh J/m and 52 J/m, respectively. Haze of 2 mm sample=79.4%.

Example 5 (comparative).

Carried out according to Example 1, except that 85.0% of the modified concentrate K-1 is dosed in stage II. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 528sh J/m and 56 J/m, respectively. Haze of 2 mm sample=85.3%.

Example 6 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-2 (Table 1) is used, and at stage II, 80.0% of the modified concentrate K-2 is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 143 J/m and 40 J/m, respectively. Haze of 2 mm sample=80.0%.

Example 7

It is carried out according to Example 1, except that at stage I the modified concentrate K-3 formula is used (Table 1), and at stage II 80.0% of the modified K-3 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 157 J/m and 41 J/m, respectively. Haze of 2 mm sample=74.3%.

Example 8

It is carried out according to Example 1, except that at stage I the modified K-4 concentrate formula is used (Table 1), and at stage II 60.0% of the modified K-4 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 208 J/m and 43 J/m, respectively. Haze of 2 mm sample=65.1%.

Example 9

Carried out according to Example 1, except that at stage I, the formulation of the modified K-5 concentrate (Table 1) is used, and at stage II, 60.0% of the modified K-5 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 157 J/m and 43 J/m, respectively. Haze of 2 mm sample=79.5%.

Example 10

Carried out according to Example 1, except that at stage I, the modified K-6 concentrate formula (Table 1) is used, and at stage II, 60.0% of the modified K-6 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 355 sh J/m and 45 J/m, respectively. Haze of 2 mm sample=75.1%.

Example 11.

Carried out according to Example 1, except that at the first stage the formulation of the modified K-7 concentrate (Table 1) is used, and at the II stage 40.0% of the modified K-7 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 162 J/m and 42 J/m, respectively. Haze of 2 mm sample=60.1%.

Example 12.

Carried out according to Example 1, except that at stage I, the formulation of the modified K-8 concentrate (Table 1) is used, and at stage II, 60.0% of the modified K-8 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 151 J/m and 41 J/m, respectively. Haze of 2 mm sample=71.4%.

Example 13

Carried out according to Example 1, except that at stage I, the formulation of the modified K-9 concentrate (Table 1) is used, and at stage II, 60.0% of the modified K-9 concentrate is dosed. The results of all tests are shown in Table 2. The composition obtained has Izod s/n impact values at +23°C and -20 ^° C ^of 178 J/m and 44 J/m, respectively. Haze of 2 mm sample=75.6%.

Example 14 (comparative).

Carried out according to Example 1, except that at stage I use the formulation of the modified concentrate K-10 (comp.) (Table 1), and at stage II dosed 60.0% of the modified concentrate K-10 (comp.). The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 175 J/m and 42 J/m, respectively. Haze of 2 mm sample=85.0%.

Example 15 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-11 (comp.) (Table 1) is used, and at stage II, 60.0% of the modified concentrate K-11 (compar.) is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 79 J/m and 33 J/m, respectively. Haze of 2 mm sample=64.1%.

Example 16

Carried out according to Example 1, except that at stage I, the modified concentrate K-12 formulation (Table 1) is used, and at stage II, 50.0% of the modified K-12 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 168 J/m and 43 J/m, respectively. Haze of 2 mm sample=75.3%.

Example 17.

Carried out according to Example 1, except that at stage I, the formulation of the modified K-13 concentrate (Table 1) is used, and at stage II, 60.0% of the modified K-13 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 259 J/m and 48 J/m, respectively. Haze of 2 mm sample=77.9%.

Example 18 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-14 (comp.) (Table 1) is used, and at stage II, 70.0% of the modified concentrate K-14 (compar.) is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength Izod s/n at +23°C and -20°C equal to 77 J/m and 35 J/m, respectively. Haze of 2 mm sample=95.1%.

Example 19 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-15 (comp.) (Table 1) is used, and at stage II, 60.0% of the modified concentrate K-15 (compar.) is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 116 J/m and 35 J/m, respectively. Haze of 2 mm sample=70.1%.

Example 20 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-16 (comp.) (Table 1) is used, and at stage II, 60.0% of the modified concentrate K-16 (compar.) is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 111 J/m and 32 J/m, respectively. Haze of 2 mm sample=72.4%.

Example 21 (comparative).

It is carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-17 (compare) (Table 1) is used, in which the ratio of elastomer (B) (Engage 8452) with component C (LLDPE Daelim XP9200) is changed so that the total density of the B+C mixture is 0.891 g/cm ³ , and 50.0% of the modified concentrate K-17 is dosed in stage II (comp.). The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 198 J/m and 48 J/m, respectively. Haze of 2 mm sample=87.6%.

Example 22 (comparative).

Carried out according to Example 1, except that at stage I, the formulation of unmodified concentrate K-18 (comp.) (Table 1) is used, and at stage II, 60.0% of unmodified concentrate K-18 (compare) is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 75 J/m and 29 J/m, respectively. Haze of 2 mm sample=70.2%.

Example 23 (comparative).

It is carried out according to Example 1, except that at stage I the modified concentrate K-13 formula is used (Table 1), and at stage II 60.0% of the modified K-13 concentrate is dosed without the use of a nucleating agent. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C equal to 215 J/m and 47 J/m, respectively. Haze of 2 mm sample=89.1%.

Example 24 (comparative).

The composition of polypropylene (PP) with a composition similar to Example 2 is obtained in one stage without preliminary production of a modified concentrate. To do this, a mixture is prepared in a paddle mixer according to the recipe given in Table 2, and mixing is carried out for 2-10 minutes at a temperature ^of 20-50 ° C. The resulting mixture of components is processed in a twin-screw extruder LTE-20-44 at a maximum temperature in the zones of the cylinder 230°C and the speed of the screws 250 min ^-1 . The dry granulate obtained on the line of the extruder LTE-20-44 is then used to determine the values of MFI _{230 / 2.16} and to obtain samples by injection molding for subsequent physical-mechanical and optical-physical tests (test names are given in Table 2) . The injection molding modes are similar to Example 1. The results of all tests are shown in Table 2. The resulting composition is characterized by Izod impact strength values s/n at +23°C and -20°C equal to 158 J/m and 42 J/m, respectively . Haze of 2 mm sample=89.7%.

Example 25.

Carried out according to Example 1, except that at stage I, the formulation of the modified K-7 concentrate (Table 1) is used, and at stage II, 80.0% of the modified K-7 concentrate is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 162 J/m and 42 J/m, respectively. Haze of 2 mm sample=60.1%.

Example 26.

It is carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-7-1 (Table 1) is used, and at stage II, 40.0% of the modified concentrate K-7-1 is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength Izod s/n at +23°C and -20°C equal to 159 J/m and 42 J/m, respectively. Haze of 2 mm sample=65.0%.

Example 27.

Carried out according to Example 1, except that at stage I, the formulation of the modified concentrate K-19 (Table 1) is used, and at stage II, 80.0% of the modified concentrate K-19 is dosed. The results of all tests are shown in Table 2. The resulting composition is characterized by Izod impact strength s/n at +23°C and -20°C equal to 505sh J/m and 50 J/m, respectively. Haze of 2 mm sample=79.7%.

Example 28.

Carried out according to Example 11, except that in stage II, 0.05% of the nucleating agent is used. The results of all tests are shown in Table 2. The resulting composition is characterized by the values of impact strength according to Izod s/n at +23°C and -20°C, equal to 157 J/m and 41 J/m, respectively. Haze of 2 mm sample=71.4%.

Example 29.

Carried out according to Example 11, except that 1.0% of the nucleating agent is used in stage II. The results of all tests are shown in Table 2. The resulting composition is characterized by Izod impact strength values s/n at +23°C and -20°C, equal to 168 J/m and 43 J/m, respectively. Haze of 2 mm sample=64.5%.

Table 1. The composition of the compositions of the concentrate obtained at stage I of the preparation of the composition.

No. Composition, wt.% K-1 K-2 K-3 K-4 K-5 K-6 K-7 K-7-1 K-8 K-9 one Component (A)* PPH030GP 59.2 59.2 59.2 59.2 59.2 54.3 49.3 49.8 59.5 58.8 2 Component (B) Engage 8452 16.74 - - - 16.74 18.84 - 16.74 16.74 3 Engage 8842 - 11.80 - - - - - - - 4 Engage 8137 - - 13.33 - - - - - - 5 Exact 8210 - - - 20.0 - - 25.0 25.0 - - 6 Component (C) Daelim XP 9200 23.26 28.20 26.67 20.0 - 26.16 25.0 25.0 23.26 23.26 7 LDPE 153 - - - - 23.26 - - - - - eight Component (D1) Trigonox 301 0.4 0.4 0.4 0.4 0.4 0.3 0.3 0.1 0.4 0.4 nine Component (D2) TMPTA 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.1 0.1 0.8

Continuation of Table 1.

No. Composition, wt.% K-10
(compar.) K-11
(compar.) K-12 K-13 K-14
(compare) K-15
(compar.) K-16
(compar.) K-17
(compar.) K-18
(compar.) K-19 one Component (A)* PPH030GP 58.6 49.60 49.35 58.9 59.4 58.9 58.9 59.2 - 58.4 2 PPH350FF 60.0 3 Component (B) Engage 8452 16.74 20.93 20.93 23.33 - 16.74 16.74 25.0 16.74 16.74 4 EPDM R563 - - - 15.0 - - - - 5 Component (C) Daelim XP 9200 23.26 29.07 - 10.01 25.0 23.26 23.26 15.0 23.26 23.26 6 Daelim XP 9400 - 29.07 - - - - - - 7 HDPE 276-73 - - 6.66 - - - - - eight Component (D1) Trigonox 301 0.4 0.4 0.25 0.4 0.4 0.4 0.4 0.4 - 0.8 nine Component (D2) TMPTA 1.0 - 0.4 0.7 0.2 - - 0.4 - 0.8 ten BDDMA - - - - - 0.7 - - - eleven TAIC - - - - - - 0.7 - -

* isotactic homopolypropylene added at the first stage of obtaining the composition

Table 2. Composition and properties of the obtained compositions (based on mixtures of stage I).

No. Composition, wt.% Example 1
(compar.) Example 2 Example 3 Example 4 Example 5
(compar.) Example 6
(compar.) Example 7 Example 8 one Component (A)** PPH270GP 49.7 39.7 29.7 19.7 14.7 19.7 19.7 19.7 2 Concentrate compositions (K) obtained at stage I K-1 50.0 60.0 70.0 80.0 85 3 K-2 80.0 4 K-3 80.0 5 K-4 60.0 6 Nucleating agent Millad 8000 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 7 The content of component (B) in the composition, % wt. 8.37 10.05 11.73 13.39 14.23 9.44 10.66 12.0 Properties of the resulting composition one MFR _230/2.16 , g/10 min 27.8 25.4 23.6 21.1 18.6 18.9 24.6 27.8 2 σ _PT, MPa 24.1 23.6 22.2 21.5 20.4 23.2 21.3 25.4 3 _εPT , % nine ten eleven 12 12 eleven eleven ten 4 Е izg., MPa 1120 1060 980 910 840 960 940 1110 5 Izod s/n +23°С, J/m 114 155 486sh 517sh 528sh 143 157 208 6 Izod s/n -20°С, J/m 35 42 48 52 56 40 41 43 7 Turbidity 1 mm/2 mm, %* 45.3/70.5 47.3/74.1 48.6/75.4 50.1/79.4 58.9/85.3 56.3/80.0 44.2/74.3 33.5/65.1 eight Transparency 1 mm/2 mm,% 87.4/49.6 85.2/48.4 82.3/45.6 79.3/41.2 73.2/39.4 71.2/40.3 85.1/46.8 88.9/67.2

Continued Tab. 2

No. Composition, wt.% Example 9 Example 10 Example 11 Example 12 Example 13 Example 14
(compar.) Example 15
(compar.) Example 16 one Component (A)** PPH270GP 39.7 39.7 59.7 39.7 39.7 39.7 39.7 49.7 2 Concentrate compositions (K) obtained at stage I K-5 60.0 3 K-6 60.0 4 K-7 40.0 5 K-8 60.0 6 K-9 60.0 7 K-10 (comparative) 60.0 eight K-11 (comparative) 60.0 nine K-12 50.0 ten Nucleating additive Millad 8000 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 eleven The content of component (B) in the composition, % wt. 10.05 11.30 10.0 10.05 10.05 10.05 10.05 10.47 Properties of the resulting composition : one MFR _230/2.16 , g/10 min 22.3 24.2 27.6 26.7 22.3 19.5 22.7 21.8 2 σ _PT, MPa 21.5 23.1 26.2 22.9 24.4 25.2 21.3 23.4 3 _εPT , % ten eleven nine ten eleven eleven nine ten 4 Е izg., MPa 1080 1010 1250 990 1050 1060 840 1040 5 Izod s/n +23°С, J/m 157 355sh 162 151 178 175 79 168 6 Izod s/n -20°С, J/m 43 45 42 41 44 42 33 43 7 Turbidity 1mm/2mm, %* 58.4/79.5 46.3/75.1 30.4/60.1 42.3/71.4 49.9/75.6 59.3/85.0 39.2/64.1 51.5/75.3 eight Transparency 1mm/2mm,% 70.4/43.6 86.2/47.3 95.3/75.9 89.3/61.2 83.2/49.6 80.2/41.3 94.1/69.3 80.9/47.2

Continuation of Table 2.

No. Composition, wt.% Example 17 Example 18
(compar.) Example 19
(compar.) Example 20
(compar.) Example 21
(compar.) Example 22
(compar.) Example 23
(compar.) Example 24
(compar.) one Component (A) PPH270GP 39.7 29.7 39.7 39.7 49.7 39.7 - - 2 PPH350FF 40.0 - 3 PPH030GP 75.04 4 Component (B) Engage 8452 10.05 5 Daelim XP9200 13.96 5 Concentrate compositions (K) obtained at stage I K-13 60.0 60.0 6 K-14 (compar.) 70.0 7 K-15 (compar.) 60.0 eight K-16 (compar.) 60.0 nine K-17 (compar.) 50.0 ten K-18 (compar.) 60.0 eleven Nucleating agent Millad 8000 0.3 0.3 0.3 0.3 0.3 0.3 - 0.3 12 Component (D1) Trigonox 301 0.25 thirteen Component (D2) TMPTA 0.4 fourteen The content of component (B) in the composition, % wt. 13.98 10.5 10.05 10.05 12.5 10.05 10.05 10.05 Properties of the resulting composition : one MFR _230/2.16 , g/10 min 21.5 22.1 28.1 29.7 23.3 25.5 21.7 20.0 2 σ _PT, MPa 25.7 23.6 20.2 19.2 22.1 19.7 23.4 25.8 3 _εPT , % ten ten nine nine ten 5 ten ten 4 Е izg., MPa 1120 910 810 880 930 960 990 1080 5 Izod s/n +23°С, J/m 259 77 116 111 198 75 215 158 6 Izod s/n -20°С, J/m 48 35 35 32 48 29 47 42 7 Turbidity 1mm/2mm, % 56.1/77.9 80.3/95.1 43.2/70.1 44.1/72.4 72.9/87.6 39.3/70.2 71.7/89.1 69.8/89.7 eight Transparency 1mm/2mm,% 72.2/44.2 18.2/6.7 85.3/49.9 81.3/41.2 33.2/19.6 81.5/61.3 56.1/29.3 71.1/31.2

* isotactic homopolypropylene (A΄) added at the first stage of obtaining the composition; ** isotactic homopolypropylene (А΄΄), added at the second stage of obtaining the composition

w- hinged failure: incomplete failure of the sample, in which the parts of the sample are held together only by a thin peripheral layer in the form of a hinge having a low residual stiffness,Eizg. - modulus of elasticity in bending, σ _pp - breaking strength,ε _pp - relative elongation at break,s/n - notched impact test,PTR - melt flow index

Continued Tab. 2

No. Composition, wt.% Example 25 Example 26 Example 27 Example 28 Example 29 one Component (A)** PPH270GP 19.7 59.7 19.7 59.95 59.0 2 Concentrate compositions (K) obtained at stage I K-7 80.0 40.0 40.0 3 K-7-1 40.0 4 K-19 80.0 ten Nucleating additive Millad 8000 0.3 0.3 0.3 0.05 1.0 eleven The content of component (B) in the composition, % wt. 20.0 10.0 13.39 10.0 10.0 Properties of the resulting composition : one MFR _230/2.16 , g/10 min 21.2 20.2 20.0 20.7 20.1 2 σ _PT, MPa 22.4 24.1 22.0 23.5 24.9 3 _εPT , % eleven eleven 12 eleven eleven 4 Е izg., MPa 940 1200 970 1150 1250 5 Izod s/n +23°С, J/m 450sh 159sh 505sh 157 168 6 Izod s/n -20°С, J/m fifty 42 fifty 41 43 7 Turbidity 1mm/2mm, %* 48.4/75.5 31.3/65.0 51.3/79.7 42.3/71.4 31.0/64.5 eight Transparency 1mm/2mm,% 80.6/44.2 92.2/73.2 77.5/40.3 90.3/71.0 93.0/74.6

As can be seen from the experimental data presented, the polypropylene-based composition obtained in accordance with the method of the present invention has an improved balance of properties compared to the prototype and analogues and has the following indicators (in accordance with examples 2-4, 7-13, 16-17, table 2):

- impact strength according to Izod s/n at +23°С - from 151 J/m to 517 J/m, at -20°С - from 41 J/m to 52 J/m;

- modulus of elasticity in bending - from 910 MPa to 1250 MPa;

- MFR _230/2.16 - from 20.0 g/10 min to 27.8 g/10 min;

- turbidity of 2 mm cast samples from 60.1% to 79.5%.

Compositions in which the content of components and their ratios are outside the declared ranges demonstrate a significant deterioration in strength, mechanical and optical properties, which is confirmed by experimental data for examples 1, 5, 6 and 22.

In addition, it is shown that the technical result is unattainable when the composition is obtained in the absence of a modifying system, in particular organic peroxide (D1) and coagent (D2) (see example 22, table 2). At the same time, the content of coagent D2 in the composition of the modifying system is an important condition, since its absence affects the impact-strength characteristics of the composition, and its content above the declared range affects the optical properties (see example 15 and example 14, respectively). It is also shown that the use of a coagent of a different nature, in particular, BDDMA instead of TMPTA (example 19, table 2) or TAIC instead of TMPTA (example 20, table 2) leads to a significant decrease in the impact strength properties of the composition, which indicates the need to use as a coagent a vinyl monomer with three or more acrylate functional groups.

The experimental data obtained indicate that the best technical result is achieved when a nucleating agent is used in the composition, while in its absence, the optical properties of the composition decrease (example 23, table 2). At the same time, it is essential to carry out the method for obtaining the composition in 2 stages as described in the present invention. Otherwise, with a simple mixing of all components in one stage, the resulting compositions will be characterized by an insufficient balance of mechanical and optical properties (see example 24, table 2).

Claims (77)

1. Composition based on polypropylene for the production of cast products, containing, in relation to the total mass of the composition, the following components: (A) from 53.8 to 79.8 wt.% crystalline isotactic polypropylene, (B) from 10 to 20 wt.% of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and (C) from 10 to 25 wt.% of one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms, and (D) modifying system, which includes: from 0.04 to 0.64 wt.% (D1) organic peroxide and from 0.04 to 0.64 wt.% (D2) coagent, which is a vinyl monomer with three or more acrylate functional groups, and (E) 0.05 to 1.0% by weight of a nucleating agent. 2. The composition according to claim 1, wherein the content (A) of crystalline isotactic polypropylene in relation to the total weight of the composition is from 58.2 to 79.7 wt.%. 3. The composition according to claim 2, wherein the content of (A) crystalline isotactic polypropylene in relation to the total weight of the composition is from 63.7 to 79.6 wt.%. 4. The composition according to claim 1, wherein the content of said (B) elastomer is between 10 and 17% by weight, based on the total weight of the composition. 5. The composition according to claim 4, wherein the content of said (B) elastomer is between 10 and 15% by weight, based on the total weight of the composition. 6. Composition according to claim 1, where the content of component (C) is from 10 to 23 wt.%, relative to the total weight of the composition. 7. Composition according to claim. 6, where the content of the specified component (C) is from 10 to 20 wt.%, relative to the total weight of the composition. 8. The composition according to claim 1, wherein the content (D1) of organic peroxide is from 0.08 to 0.48 wt.%, relative to the total weight of the composition. 9. Composition according to claim 8, wherein the content (D1) of organic peroxide is from 0.1 to 0.4 wt.%, relative to the total weight of the composition. 10. Composition according to claim 1, where the content of the coagent (D2) is from 0.08 to 0.48 wt.%, relative to the total weight of the composition. 11. Composition according to claim 10, where the content of the coagent (D2) is from 0.1 to 0.4 wt.%, relative to the total weight of the composition. 12. Composition according to claim 1, where the content of the nucleating agent (E) is from 0.1 to 0.8 wt.%, relative to the total weight of the composition. 13. The composition according to claim 12, wherein the content of the nucleating agent (E) is from 0.2 to 0.5 wt.%, relative to the total weight of the composition. 14. The composition of claim. 1, where the specified composition additionally contains optional additives in an amount of from 0 to 0.3 wt.%, relative to the total weight of the composition. 15. The composition according to claim 1, where the crystalline isotactic polypropylene (A) is a mixture of polypropylenes (A') and (A'') differing in melt flow index values. 16. The composition according to claim 15, wherein the melt flow index values of the polypropylenes A' and A'' are from 2.0 to 4.0 g/10 min and from 20 to 40 g/10 min, respectively. 17. The composition of claim 14, wherein the melt flow index values of the polypropylenes A' and A'' are 2.5 to 3.5 g/10 min and 25 to 35 g/10 min, respectively. 18. Composition according to claim 1, where ethylene-octene-1 copolymer is used as elastomer (B). 19. The composition according to claim 18, wherein said ethylene-α-olefin copolymer elastomer (B) has a density of 0.855 to 0.890 g/cm ³ . 20. Composition according to claim 19, wherein said elastomer (B) has a density of 0.857 to 0.885 g/cm ³ . 21. The composition according to claim 19, wherein said elastomer (B) is characterized by a melt flow index (MFR _190/2.16 ) from 1 to 30 g/10 min. 22. The composition according to claim 1, wherein said component (C) is selected from the group of polymers selected from the group of LDPE, LLDPE, LLDPE and HDPE. 23. The composition according to claim 1, where the specified component (C) is characterized by a density of 0.910 to 0.965 g/cm ³ . 24. The composition according to claim 21, where the specified component (C) is characterized by a density of 0.915 to 0.960 g/cm ³ . 25. The composition according to claim 1, where the specified component (C) is characterized by a melt flow index (MFR _{190 / 2.16} ) from 0.1 to 10 g / 10 min. 26. The composition according to claim 23, wherein the melt flow index (MFR _190/2.16 ) of component (C) is from 0.3 to 8 g/10 min. 27. The composition according to claim 1, where the elastomer (B) and homopolymer (C) are used in such a mass ratio to each other in which the density of the mixture (B + C) will be close to or equal to the density of isotactic polypropylene (A). 28. The composition according to claim 27, where the density of the mixture of elastomer (B) and homopolymer (C) is not less than 0.995, preferably not less than 0.997 of the density of isotactic polypropylene (A), and not more than 1.007, preferably not more than 1.005 of the density of isotactic polypropylene (BUT). 29. The composition according to claim 27, where the elastomer (B) and the homopolymer (C) are used at such a mass ratio relative to each other, in which the concentration of the elastomer (B) in the composition is at least 10 wt.% with respect to the total weight of the composition. 30. The composition according to claim 1, where the organic peroxide (D1) is selected from the group consisting of tert-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, di-tert-butyl peroxide, tert-butylcumene peroxide, dicumyl peroxide, 1.3-1.4 -bis-(tert-butylperoxyisopropyl)benzene, acetyl peroxide, benzoyl peroxide, isobutyryl peroxide, bis-3,5,5-trimethylhexanoyl peroxide, methyl ethyl ketone peroxide. 31. The composition according to claim 1, where trimethylol propane triacrylate is used as the vinyl monomer of the coagent (D2). 32. The composition according to claim 1, wherein the nucleating agent (E) is a nucleating agent of an organic nature or a mixture of such nucleating agents. 33. The composition according to claim 32, where "clarifiers" are used as an organic nucleating agent. 34. The composition according to claim 32, where dibenzylidene sorbitol derivatives are used as a nucleating agent, for example 3,4-dimethyldibenzylidene sorbitol, bis(4-propylbenzylidene) propylsorbitol, or a mixture thereof. 35. The composition of claim 14, wherein optional additives other than nucleating agents include, for example, antioxidants, heat stabilizers, stabilizers, and mixtures thereof. 36. A method for producing a composition based on polypropylene, including the steps : I) preparing a concentrate composition by mixing (B) an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and (C) one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms, with (A') crystalline isotactic polypropylene with an MFR of 2.0 to 4.0 g/10 min, in the presence of a modifying system (D) comprising an organic peroxide (D1) and a coagent (D2), in which is used as a vinyl monomer with three or more functional acrylate groups, and subsequent compounding of the resulting mixture in the melt; and II) mixing the concentrate composition obtained in step (I), taken in an amount of from 40 to 80 wt.%, with (A'') crystalline isotactic polypropylene with an MFR of 20 to 40 g/10 min and (E) a nucleating agent, followed by compounding said mixture in the melt. 37. The method of obtaining a composition according to claim 36, where the amounts of components used vary in such a way that the composition obtained in accordance with the claimed method contains: (A' + A'') = (A) from 53.8 to 79.8 wt.% of crystalline isotactic homopolypropylene, (B) from 10 to 20 wt.% of an elastomer based on a copolymer of ethylene with an α-olefin containing from 4 to 10 carbon atoms, and (C) from 10 to 25 wt.% of one or more homopolymers of ethylene and/or random thermoplastic copolymers of ethylene with α-olefins containing from 3 to 10 carbon atoms, and (D) modifying system, which includes from 0.04 to 0.64 wt.% organic peroxide (D1), from 0.04 to 0.64 wt.% coagent (D2), which is used as a vinyl monomer with three or more acrylate functional groups, and (E) from 0.05 to 1.0 wt.% nucleating agent and, optionally, additional additives. 38. The method of obtaining the composition according to p. 36, where the components (A') and (A'') are used in their mass ratio from 0.1 to 9, preferably from 0.25 to 4, most preferably from 0.75 to 3 ,5. 39. A process for preparing a composition according to claim 36, wherein component (A') is a crystalline isotactic polypropylene having a melt flow index of 2.5 to 3.5 g/10 min. 40. A process for preparing a composition according to claim 36, wherein component (A'') is a crystalline isotactic polypropylene having a melt flow index of 25 to 35 g/10 min. 41. A method for producing a composition according to claim 36, where an ethylene-octene-1 copolymer is used as the elastomer (B). 42. The method of obtaining a composition according to p. 36, where the elastomer (B) is characterized by a density of 0.855 to 0.890 g/cm ³ . 43. The method of obtaining a composition according to p. 42, where the elastomer (B) is characterized by a density of 0.857 to 0.885 g/cm ³ . 44. A method for producing a composition according to claim 36, where the elastomer (B) is characterized by a melt flow index (MFR _{190 / 2.16} ) from 1 to 30 g / 10 min. 45. A method for preparing a composition according to claim 36, where any polymers from the group of LDPE, LLDPE, LLDPE and HDPE are selected as component (C). 46. The method of obtaining a composition according to p. 36, where the component (C) is characterized by a density of 0.910 to 0.965 g/cm ³ . 47. The method of obtaining a composition according to p. 46, where the specified component (C) is characterized by a density of 0.915 to 0.960 g/cm ³ . 48. A method for producing a composition according to claim 36, where the specified component (C) is characterized by a melt flow index (MFR _{190 / 2.16} ) from 0.1 to 10 g / 10 min. 49. The method of obtaining a composition according to p. 48, where the specified component (C) is characterized by a melt flow index (MFR _{190 / 2.16} ) from 0.3 to 8 g / 10 min. 50. The method of obtaining a composition according to claim 36, where the specified elastomer (B) and the homopolymer of ethylene and / or its thermoplastic copolymer (C) are used at such a mass ratio relative to each other, in which the density of the mixture (B + C) will be close or equal to the density of isotactic polypropylene (A). 51. A method for producing a composition according to claim 50, where the density of the mixture of elastomer (B) and homopolymer (C) is not less than 0.995, preferably not less than 0.997 of the density of isotactic polypropylene (A), and not more than 1.007, preferably not more than 1.005 of the density isotactic polypropylene (A). 52. A method for producing a composition according to claim 50, where the elastomer (B) and the homopolymer (C) are used at such a mass ratio with respect to each other, in which the concentration of the elastomer (B) in the composition is at least 10 wt.% in relation to to the total weight of the composition. 53. The method for preparing the composition according to claim 36, wherein the organic peroxide (D1) is a compound selected from the group consisting of tert-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydroperoxide, di-tert-butyl peroxide, tert-butylcumene peroxide, dicumyl peroxide, 1,3-1,4-bis-(tert-butylperoxyisopropyl)benzene, acetyl peroxide, benzoyl peroxide, isobutyryl peroxide, bis-3,5,5-trimethylhexanoyl peroxide, methyl ethyl ketone peroxide. 54. The method for preparing the composition according to claim 36, wherein trimethylol propane triacrylate is used as the vinyl monomer with three or more functional acrylate groups of the coagent (D2). 55. A method for preparing a composition according to claim 36, wherein a nucleating agent of an organic nature or a mixture of such nucleating agents is used as the nucleating agent (E). 56. The method of obtaining a composition according to p. 55, where "clarifiers" are used as the specified nucleating agent of organic nature. 57. A method for preparing a composition according to claim 55, where dibenzylidene sorbitol derivatives are used as a nucleating agent, for example, 3,4-dimethyldibenzylidene sorbitol, bis(4-propylbenzylidene) propyl sorbitol, or a mixture thereof. 58. The method of obtaining a composition according to p. 37, where optional additives other than nucleating agents include, for example, antioxidants, heat stabilizers, stabilizers, as well as mixtures thereof. 59. The method of obtaining a composition according to claim 36, where the mixing of the components in stages I and II is carried out in a mixing equipment for a period of time from 1 to 20 minutes, preferably from 2 to 10 minutes. 60. The method of obtaining a composition according to p. 36, where the mixing of the components in stages I and II is carried out at a temperature of from 10 to 50°C, preferably from 20 to 40°C. 61. The method of obtaining a composition according to claim 36, where mixing and melt compounding in stages I and II are carried out using mixing equipment and an extruder, respectively. 62. Composition based on polypropylene, obtained by the method according to item 36. 63. The use of compositions based on polypropylene according to any one of paragraphs. 1-35 as a material for the manufacture of thin-walled cast products. 64. Cast thin-walled product containing a composition based on polypropylene according to any one of paragraphs. 1-35. 65. The product according to claim 64, which is obtained by injection molding.