KR20220076230A - Composition for Wrap film and Wrap film using the same - Google Patents

Abstract

The present invention relates to a wrap film, and more specifically, a new composition that includes both the advantages of the PVC-based wrap film and the LDPE-based wrap film because of its excellent elasticity and anti-fogging properties as well as high heat resistance and high adhesiveness. of the Wrap film composition and to a Wrap film comprising the composition.

Description

Wrap film composition and Wrap film comprising the composition {Composition for Wrap film and Wrap film using the same}

The present invention relates to a wrap film manufacturing technology, and more specifically, a wrap film composition with a new composition that includes both the advantages of the PVC-based wrap film and the LDPE-based wrap film because of its excellent adhesion and anti-fogging properties. And it relates to a Wrap film comprising the composition.

Existing wrap (wrap) films for food packaging are generally high-transparency films with a thickness of about 12 to 15 μm. They are easy to wrap, and are suitable for maintaining the freshness of food by preventing the inflow of foreign substances and blocking moisture. It is widely used for storage and packaging of all kinds of food, such as fruits, vegetables, rice cakes, processed food and delivery food.

Wrap films are mainly made of synthetic resins such as polyvinylchloride (PVC), polyvinylidene chloride (PVDC), and low density polyethylene (LDPE). In general, since physical properties such as transparency, adhesion, anti-fogging properties, elongation, softness, and tear strength must be secured, PVC, which has excellent properties such as these, is mainly used. In other words, PVDC and LDPE have significantly lower properties that determine the quality of wrap films, such as transparency, elongation, adhesion, and anti-fogging properties, compared to PVC, so there is a limit to their application for manufacturing wrap films for food packaging.

However, in the wrap film of PVC resin, a plasticizer is essential to provide softness, etc. As the plasticizer, diethylhexyl adipate (DOA) or diethylhexyl phthalate (DOP), which has high elongation and adhesion, is mainly used. However, there is a problem that these plasticizers are harmful as endocrine disruptors. On the other hand, the PE resin wrap film does not contain plasticizer, so it is safe for the human body, but has low adhesive strength. There are problems that can leak out. In order to solve this problem, when a separate adhesive is applied to impart adhesive strength to the PE resin, the adhesive is transferred to the surface, thereby reducing film winding and unwinding properties.

Furthermore, in the case of PVC wrap, there are issues of chlorine gas generation and toxicity during incineration, so regulations on the use of the wrap are being reviewed. Also, in the case of PEWrap, securing performance comparable to PVCWrap is emerging as an important issue due to its high price and low performance compared to PVC. Various methods have been tried to solve this problem, but among them, a method of manufacturing a wrap using various additives to PP (Polypropylene) having the best heat resistance and physical properties is attracting attention.

However, in the case of wrap products using PP as the base resin, there is a problem in that the adhesive performance as well as the anti-fogging performance is low when manufacturing the wrap using the existing additives, and it is not possible to secure sufficient elongation.

Therefore, there is a demand for development of a polypropylene-based wrap film composition of a new composition in which the above-described problems are solved, and a wrap film prepared from the composition.

Patent Registration No. 10-0681364

Therefore, it is an object of the present invention to provide a wrap film composition of a new composition having improved adhesion and anti-fogging properties while being harmless to the human body due to improved properties, that is, excellent chemical resistance, while using PP as a base resin .

Another object of the present invention is to provide a wrap film with excellent economic feasibility by maximizing basic properties of the wrap film as well as simplifying the manufacturing process since it can be manufactured as a single layer with the wrap film composition of the new composition as described above.

The object of the present invention is not limited to the object mentioned above, and even if not explicitly mentioned, the object of the invention that can be recognized by a person of ordinary skill in the art from the description of the detailed description of the invention to be described later may also be included. .

In order to achieve the object of the present invention described above, the present invention is a polypropylene-based resin 30 to 70% by weight; 1 to 20% by weight of thermoplastic elastomer A; 5 to 40% by weight of thermoplastic elastomer B; 1 to 30% by weight of the copolymer; 1 to 30% by weight of the adhesive resin; and 0.1 to 5 wt% of an antifogging agent; provides a Wrap film composition comprising.

In a preferred embodiment, the polypropylene-based resin is a homopolymer having only a propylene unit or a binary copolymer further having an ethylene unit in the polymer molecular chain.

In a preferred embodiment, the thermoplastic elastomer A is any one selected from the group consisting of Triblock copolymer based on styrene and ethylene/butylene, High 1,2 butadiene, coupled hydrogenated styrene-butadiene (S-EB)x Polymer, and the Thermoplastic elastomer B has a propylene repeat unit with random ethylene distribution structure and has a Melt Index of 0.1 to 30 g/10 min (190° C., 2.16 Kgf).

In a preferred embodiment, the copolymer is a copolymer resin containing 4 to 40% of polar groups and has a melt index of 0.1 to 25 g/10 min.

In a preferred embodiment, the adhesive resin is at least one selected from the group consisting of petroleum resin, rosin resin, rosin derivative resin, polybutylene (PB), and polyisobutylene (PIB).

In a preferred embodiment, the petroleum resin is selected from the group consisting of aliphatic (C5-based) petroleum resins, aromatic-based (C9-based) petroleum resins, C5/C9 copolymer-based petroleum resins, alicyclic petroleum resins, and hydrides thereof which one to be,

The rosin resin is unmodified rosin (raw rosin) including gum rosin, wood rosin, and tall oil rosin, and modified rosin (hydrogenated rosin) modified by at least one of hydrogenation, disproportionation, and polymerization of the unmodified rosin. , disproportionated rosin, polymerized rosin, chemically modified rosin) is any one selected from the group consisting of,

The rosin derivative resin may include rosin esters including an esterified product of unmodified rosin and an esterified product of modified rosin; unsaturated fatty acid modified rosins obtained by modifying unmodified rosin or modified rosin with unsaturated fatty acids; unsaturated fatty acid-modified rosin esters obtained by modifying rosin esters with unsaturated fatty acids; Rosin alcohols obtained by reducing the carboxyl group in unmodified rosin, modified rosin, unsaturated fatty acid modified rosin or unsaturated fatty acid modified rosin ester; metal salts of unmodified rosin, modified rosin, and rosin esters; Any one selected from the group consisting of unmodified rosin, modified rosin, and rosin phenol resin obtained by thermal polymerization by adding phenol to rosin esters with an acid catalyst.

In a preferred embodiment, the antifogging agent includes at least one selected from the group consisting of C ₁₀ ~ C ₂₀ fatty acids and glycerol or polyglycerol esters and derivatives thereof.

In a preferred embodiment, the antifogging agent includes an ester and derivatives thereof obtained by reacting a fatty acid containing lauric acid (C12) and stearic acid (C18) fatty acids in a ratio of 1:1 to 1:3 with glycerol or polyglycerol. do.

In addition, the present invention provides a Wrap film, characterized in that made of any one of the Wrap film composition described above.

In a preferred embodiment, the Wrap film is a single layer and has a thickness of 5 to 30 μm.

In a preferred embodiment, the Wrap film has a tensile strength of 35 MPa or more, an elongation of 350% or more, and an adhesiveness of 40 nN or more.

According to the wrap film composition of the present invention described above, while using PP as the base resin, the basic properties of the wrap film are improved, that is, excellent chemical resistance, so it is harmless to the human body and has excellent adhesion and anti-fogging properties.

In addition, since the Wrap film of the present invention can be manufactured as a single layer with the Wrap film composition of the new composition as described above, the basic necessary properties of the Wrap film are maximized, and the manufacturing process is simple and thus economical is excellent.

These technical effects of the present invention are not limited only to the above-mentioned range, and even if not explicitly mentioned, the effects of the invention that can be recognized by those of ordinary skill in the art from the description of the specific content for the implementation of the invention to be described later of course included

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the description of the invention exists, but is not limited to one or more other It is to be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

Unless defined otherwise, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with the meanings in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention. does not

In interpreting the components, it is construed as including an error range even if there is no separate explicit description. In particular, when the terms "about", "substantially", etc. of degree are used, they may be construed as being used in a sense at or close to the numerical value when manufacturing and material tolerances inherent in the stated meaning are presented. . Also, where the description discloses numerical ranges, such ranges are continuous and inclusive of all values from the minimum to the maximum inclusive of the range, unless otherwise indicated. Furthermore, when such ranges refer to integers, all integers inclusive from the minimum to the maximum inclusive are included, unless otherwise indicated.

In the case of a description of a temporal relationship, for example, 'after', 'following', 'after', 'before', etc., when temporal precedence is described, 'immediately' or 'directly' Unless ' is used, cases that are not continuous are included.

Hereinafter, the technical configuration of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.

However, the present invention is not limited to the embodiments described herein, and like reference numerals indicate like elements in different forms.

The technical feature of the present invention is that while using PP as the base resin, the basic physical properties of the wrap film are improved, that is, it has excellent chemical resistance, so that it is harmless to the human body and has improved adhesion and anti-fogging properties, as well as excellent heat resistance and elasticity. There is a new composition of the wrap film composition with a special combination of various organic and inorganic materials.

Therefore, the Wrap film composition of the present invention comprises 30 to 70% by weight of a polypropylene-based resin; 1 to 20% by weight of thermoplastic elastomer A; 5 to 40% by weight of thermoplastic elastomer B; 1 to 30% by weight of the copolymer; 1 to 30% by weight of the adhesive resin; and 0.1 to 5% by weight of an antifogging agent.

First, the polypropylene-based resin may be a homopolymer having only a propylene unit or a binary copolymer further having an ethylene unit in the polymer molecular chain. It may be preferable that the copolymer is obtained by random copolymerization in view of transparency, and with respect to stereoregularity, any one of the same or ordered structure, or a mixture thereof may be used. Others are not particularly limited, but in consideration of use in a film for food packaging, it may be one that has passed the standard for food packaging in terms of safety.

As an embodiment, when the polypropylene-based resin included in the wrap film composition of the present invention is random polypropylene, the ethylene content may be 0 to 10%, and the melt flow index may be 0.1 g/10min to 30 g/10min (230 ℃, 2.16 Kgf).

The polypropylene-based resin may be included in an amount of 30 to 70% by weight in the Wrap film composition of the present invention. If the content of the polypropylene-based resin is less than 30% by weight, there is a problem that the processability and transparency of the film are reduced, and if it exceeds 70% by weight, the adhesion and elongation are reduced, and furthermore, the extrusion appearance and processability may be reduced. to be.

Since thermoplastic elastomer A and thermoplastic elastomer B are used as softeners, they have abundant flexibility by themselves, and when incorporated into polypropylene-based resins, all known softeners can be used as long as they have properties that can bring about a softening effect without losing transparency. There will be.

As an embodiment, in the present invention, the types and content ratios of the thermoplastic elastomer A and the thermoplastic elastomer B included in the Wrap film composition of the present invention were experimentally determined. That is, the thermoplastic elastomer A may be a styrenic block copolymer, in particular, any one selected from the group consisting of Triblock copolymer based on styrene and ethylene/butylene or High 1,2 butadiene, coupled hydrogenated styrene-butadiene (S-EB)x Polymer One and more preferably Melt Index 0.1 to 40g/10min (230°C, 2.16 Kgf), Polystyrene Content 5 to 65%. The thermoplastic elastomer B may be any one selected from those having a Melt Index of 0.1 to 30 g/10 min (190° C., 2.16 Kgf) in a propylene repeat unit with random ethylene distribution structure.

When the thermoplastic elastomer A and the thermoplastic elastomer B having these properties are used in 1 to 20 wt% and 5 to 40 wt%, respectively, in the wrap film composition of the present invention, compatibility with other components is good and the original polypropylene resin It does not significantly impair transparency, moisture resistance and heat resistance, and does not affect the anti-fogging and adhesive properties imparted by other components, and has an effect of reducing the tensile modulus or flexural modulus (i.e., the effect of imparting flexibility) as well as resistance to rebound Because even the castle was excellent.

The copolymer is a component used to impart adhesiveness to the polypropylene-based resin, and as will be described later, it must be used together with the adhesive resin to further improve the adhesiveness. The copolymer means all known universally used copolymers, and in the case of a polar copolymer, it is not limited as long as it is a modified resin having a polar functional group introduced thereto. On the other hand, when the copolymer used in the present invention is a polar copolymer, the polar functional group is a modified resin introduced in an amount of 4% by weight or more and 40% by weight or less, and the melt index may be 0.1 to 25g/10min. In one embodiment, the polar copolymer is EVA (Ethylene vinyl acetate) resin, EMA (Ethylene methyl acetate) resin, EEA (Ethylene ethyl acetate) resin, E(M)AA (ethylene(metha)acrylic acid) resin, EVOH ( Ethylene vinyl alcohol) may be a polyethylene resin-based polar copolymer including a resin.

The copolymer included in the Wrap film composition of the present invention may be included in an amount of 1 to 30% by weight. If the content of the copolymer is less than 1% by weight, transparency may be reduced, and adhesiveness may be lowered because there is no synergistic effect with the adhesive resin. because there is

The adhesive resin is a component used to impart adhesiveness to the polypropylene-based resin, and it has been experimentally confirmed that a synergistic effect of remarkably improving adhesiveness when used in parallel with the copolymer appears. All known adhesive resins may be used as the adhesive resin of the present invention, but as an embodiment, it is selected from the group consisting of petroleum resin, rosin resin, rosin derivative resin, polybutylene (PB), and polyisobutylene (PIB). There may be more than one.

The petroleum resin may be any one selected from the group consisting of aliphatic (C5-based) petroleum resins, aromatic-based (C9-based) petroleum resins, C5/C9 copolymer-based petroleum resins, alicyclic petroleum resins, and hydrides thereof.

Rosin resin is unmodified rosin (raw rosin) including gum rosin, wood rosin, and tall oil rosin, and modified rosin (hydrogenated rosin, It may be any one selected from the group consisting of disproportionated rosin, polymerized rosin, and chemically modified rosin).

Rosin derivative resins include rosin esters including esters of unmodified rosin and esters of modified rosin; unsaturated fatty acid modified rosins obtained by modifying unmodified rosin or modified rosin with unsaturated fatty acids; unsaturated fatty acid-modified rosin esters obtained by modifying rosin esters with unsaturated fatty acids; Rosin alcohols obtained by reducing the carboxyl group in unmodified rosin, modified rosin, unsaturated fatty acid modified rosin or unsaturated fatty acid modified rosin ester; metal salts of unmodified rosin, modified rosin, and rosin esters; It may be any one selected from the group consisting of unmodified rosin, modified rosin, and a rosin phenol resin obtained by thermal polymerization of phenol by adding phenol to rosin esters with an acid catalyst.

The adhesive resin may be included in the wrap film composition of the present invention in an amount of 1% to 30% by weight, and if it is less than 1% by weight, a synergistic effect with the adhesive resin does not appear, so the adhesiveness may decrease, and if it exceeds 30% by weight, it is This is because there is a problem in the discharge rate and moldability due to the acid problem.

The antifogging agent is a component used to maintain the transparency of the wrap film surface by preventing fogging, and various fatty acid ester compounds are known as the antifogging agent used in the prior art. However, in the Wrap film composition of the present invention, a polypropylene-based resin is used as a base resin, not PVC or LDPE, which are mainly used conventionally, and other specially combined as described above to solve the disadvantages such as low adhesion of the polypropylene-based resin. A number of experiments were performed to select the most suitable antifogging agent in consideration of the interaction with the components. As a result, in the composition as in the present invention, when a composition containing at least one selected from the group consisting of C ₁₀ ~ C ₂₀ fatty acids and glycerol or polyglycerol esters and derivatives thereof is used as an anti-fogging agent, the anti-fogging properties are excellent. was confirmed experimentally. In particular, it was confirmed experimentally that the composition containing the ester and its derivative obtained by reacting glycerol or polyglycerol with fatty acids containing lauric acid (C12) and stearic acid (C18) in a ratio of 1:1 to 1:3 was the best experimentally.

Accordingly, the antifogging agent used in the present invention may include at least one selected from the group consisting of esters and derivatives of fatty acids and glycerol or polyglycerol, and the fatty acids may preferably be C ₁₀ ~ C ₂₀ fatty acids. In one embodiment, C ₁₀ ~ C ₂₀ fatty acid is Capric acid (C ₁₀ ), Lauric acid (C ₁₂ ), Myristic acid (C ₁₄ ), Palmitic acid (C ₁₆ ), Stearic or Oleic or Linoleic acid (C ₁₈ ) , Arachidonic (C ₂₀ ) It may be any one or more selected from the group consisting of specific fatty acids, such as. Esters obtained by esterification of fatty acids with glycerol or polyglycerol and their derivatives are polyglycerol fatty acid esters, glycerin fatty acid esters, single fatty acid derivatives of glycerol, polyglycerol stearic acid esters, polyglycerol palmitic acid esters, and polyglycerols as an embodiment. and lauric acid esters. If necessary, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid, tridecylic acid, mischiric acid, pentadecylic acid, saturated fatty acids such as palmitic acid, margaric acid, stearic acid, nonadecylic acid, arachidic acid, henicosylic acid, behenic acid, tricosylic acid and lignoseric acid; α-Linolenic acid, stearidonic acid, polyunsaturated fatty acid, docosapentaenoic acid, docosahexaenoic acid, linoleic acid, γ-linolenic acid, dihomo-γ-linolenic acid, arachidonic acid, docosapentaenoic acid, palmitoleic acid, A small amount of unsaturated fatty acids such as vaccenic acid, bauric acid, oleic acid, elaidic acid, erucic acid and nervonic acid may be added.

The anti-fogging agent may be included in the Wrap film composition of the present invention in an amount of 0.1 wt % to 5 wt %, and if it is less than 0.1 wt %, the anti-fogging property may be greatly reduced, and if it exceeds 5 wt %, the anti-fogging agent will continuously seep into the transparency This is because there is a problem with this remarkably falling.

Next, the Wrap film of the present invention is made of the Wrap film composition having the above-described configuration, and as an embodiment, a method of extruding and molding the Wrap film composition, specifically, manufactured by a T-die extruder As a single-layered film, the thickness may be 5 to 30 μm, and it can be molded very thinly and is suitable for food packaging.

The wrap film of the present invention, based on polypropylene resin, has a tensile strength of 35 MPa or more, an elongation of 350% or more, and a tackiness of 40 nN or more. Since it is harmless to the human body even at high temperatures above ℃, it can be applied as a wrap film for various food packaging. In particular, in the case of adhesiveness, practical adhesiveness has not been measured until now and has been emotionally evaluated. In the present invention, the adhesiveness is scientifically measured and the actual usable adhesiveness is clarified as well as polypropylene-based resins. Although it was used as a base resin, it was confirmed that the adhesiveness was equal to or higher than that of a commercial wrap film using an actual PVC resin or LDPE resin as a base film.

Examples 1 to 6

Wrap film compositions 1 to 6 were prepared by uniformly mixing the components shown in Table 1 in the indicated amounts.

composition Example One 2 3 4 5 6 polypropylene resin 34 38.9 34 34 42 57 Thermoplastic Elastomer A 8 8 8 8 One 20 Thermoplastic Elastomer B 40 40 22 22 39 5 copolymer 5 5 One 30 5 5 adhesive resin 8 8 30 One 8 8 Anti-fogging agent 1 5 0.1 5 5 5 5 Total amount (wt%) 100 100 100 100 100 100

Here, the polypropylene-based resin is a random polypropylene obtained by randomly polymerizing propylene by adding 5% by weight of ethylene when polymerizing propylene, and has a melt flow index of 10 g/10 min. Triblock copolymer based on styrene and ethylene/butylene was used for thermoplastic elastomer A, and propylene repeat units with random ethylene distribution were used for thermoplastic elastomer B. The thermoplastic elastomer A used has a melt flow index of 3 g/10min and polystyrene content of 12%, and thermoplastic elastomer B has a melt flow index of 1 g/10min. EVA was used as the copolymer, petroleum resin was used as the adhesive resin, and as the antifogging agent 1 in Example 1, polyglycerol was an ester using lauric acid (C ₁₂ ) and stearic acid (C ₁₈ ) fatty acids in a 1:1 ratio. Polyglycerol fatty acid ester 1 obtained by the reaction was used, and in Example 2, polyglycerol fatty acid ester 2 obtained by esterification of polyglycerol using Lauric acid (C ₁₂ ) and Stearic acid (C ₁₈ ) fatty acids in a ratio of 1:3 was used, and in Examples 3 to 6, the polyglycerol obtained by esterification of the fatty acids of Capric acid (C ₁₀ ), Myristic acid (C ₁₄ ), Palmitic acid (C ₁₆ ), Arachidonic (C ₂₀ ) and polyglycerol each having a carbon number Fatty acid esters 3 to 6 were used.

Examples 7 to 12

After melt-kneading the Wrap film compositions 1 to 6 obtained in Examples 1 to 6, wrap films 1 to 6 were prepared using a T-die extruder. Here, the film was formed at a processing temperature of 170 to 240°C.

Comparative Examples 1 to 9

Comparative Example Compositions 1 to 9 were prepared by uniformly mixing the components shown in Table 2 in the indicated amounts.

composition comparative example One 2 3 4 5 6 7 8 9 polypropylene resin 34 38.9 34 39 42 47 42 59 62 Thermoplastic Elastomer A 8 8 8 8 8 8 0 8 0 Thermoplastic Elastomer B 40 40 35 40 40 40 40 0 0 copolymer 5 5 5 0 5 0 5 20 25 adhesive resin 8 8 8 8 0 0 8 8 8 Anti-fogging agent 1 5 5 5 5 5 5 Anti-fogging agent 2 5 0.1 10 Total amount (wt%) 100 100 100 100 100 100 100 100 100

Here, as the antifogging agent 2, TOWREX antifogging agent was used in Comparative Examples 1 and 2, AF450L was used in Comparative Example 3, and the antifogging agent 1 used in Comparative Examples 4 to 9, respectively, was the same polyglycerin as used in Examples 1 to 6 Fatty acid esters 1 to 6 were used. For the rest of the components, the same components as in the examples were used.

Comparative Examples 10 to 18

Comparative Example Compositions 1 to 9 obtained in Comparative Examples 1 to 9 were carried out in the same manner as in Example 7 to prepare Comparative Examples Wrap Films 1 to 9.

Experimental example

The physical properties of the Wrap films 1 to 6 prepared in Examples 7 to 12 and Comparative Examples Wrap films 1 to 9 prepared in Comparative Examples 10 to 18 were measured as follows, and the results are summarized in Table 3.

In Table 3, when the tensile strength is 35 MPa or more, the elongation is 350% or more, and the adhesiveness is 40 or more, it is practically possible. In the case of receiving only the evaluation of , it was judged that it was practically possible, and in the case of items judged as △ or ×, it was determined that there was a problem in practical use.

1) Tensile strength

The tensile strength of each of the films of Examples and Comparative Examples was evaluated as follows.

The prepared wrap film was aged at room temperature for 24 hours, and then the physical properties were measured. The measuring equipment was measured according to ASTM D638 by attaching a 5kN load cell to the Instron 3369 model.

2) elongation

For each of the films of Examples and Comparative Examples, elongation was evaluated as follows. The prepared wrap film was aged at room temperature for 24 hours, and then the physical properties were measured. The measuring equipment was measured according to ASTM D638 by attaching a 5kN load cell to the Instron 3369 model.

3) Adhesive

For each of the films of Examples and Comparative Examples, adhesion was evaluated as follows.

The prepared Wrap film was aged at room temperature for 24 hours, and then adhesiveness was measured. The measurement equipment was measured according to KS D2714: 2016 using Piezoresponse Force Microscopy Mode for Atomic Force Microscopy of KTR (Korea Testing and Research Institute).

4) Transparency evaluation

Transparency was evaluated as follows for each of the films of Examples and Comparative Examples.

The cloudiness of the film was measured using Koptri (manufactured by Nippon Denshoku Industries, Ltd.) according to the method described in ASTM-D-1003, and transparency was evaluated according to the following criteria. .

◎: less than 1.0

○: 1.0 or more, less than 2.0

△: 2.0 or more, less than 3.0

×: 3.0 or more

5) Anti-fogging evaluation

Anti-fogging properties were evaluated as follows for each of the films of Examples and Comparative Examples.

60 ml of water at 30° C. was put into a glass beaker with a capacity of 100 ml, and the inlet of the beaker was sealed and sealed with films of each of Examples and Comparative Examples after storage for a predetermined period under a prescribed temperature. Then, it is placed in a thermostat at 5° C., and the state of adhesion of water droplets to the inner surface of the film after 1 hour is visually observed and evaluated based on the evaluation criteria (class 1 to 10) shown below, and from 1 day to 30 days after film production. The change with time was measured, and the thing which maintained grade 7 or more was set as the pass. The film was stored at a storage temperature of 40°C.

10th grade: No water droplets at all and completely wet.

Grade 9: There is no cloudiness at all, but small water droplets exist locally in three or four places.

Level 8: Interim assessment of Levels 7 and 9

Level 7: There is no cloudiness, but small water droplets are present everywhere.

Level 6: Interim assessment of Levels 5 and 7

Level 5: There is no cloudiness, but the splashed water becomes large water droplets and is dotted with it.

Level 4: Interim assessment of Levels 3 and 5

Grade 3: A state in which large water droplets are condensed on the front surface, making it cloudy and almost invisible.

Level 2: Intermediate evaluation of Level 2 and Level 3

Grade 1: The whole is cloudy and the contents cannot be seen at all.

◎: 9th and 10th grade

○: 7th and 8th grade

△: Level 4 ~ Level 6

×: Level 1 ~ Level 3

6) Formability

Examples and Comparative Examples Films were molded at a processing temperature of 170 to 240° C. using a T-die extruder in molding each of the films. From the molding state at that time, the following reference|standard evaluated the moldability of a film.

◎: Film thickness less than 15um can be molded

○: 15um to 30um film thickness can be molded

△: 30um to 50um film thickness can be molded

×: It cannot be smoothly formed within 50 μm, and the discharge amount is often lowered or

It is not possible to form a film of the desired thickness due to the occurrence of holes in the film.

7) Cutability

Examples and Comparative Examples Each film is wound around a paper tube with a width of 300 mm and a winding length of 20 m, and this is installed in a "manual wrap wrapping machine (TW-400)", the film is placed on a roller, and the film is properly After pulling out, it was cut by contacting the cutter. From the cutting state at that time, the following reference|standard evaluated the cutability of the film.

◎: Can be cut cleanly with light force

○: Requires some force, but can be cut cleanly

△: Can be cut, but not easy

×: Cannot cut smoothly, often the film is stretched without being cut, torn at an angle, or the cutter is damaged due to excessive force when cutting the film

division The tensile strength
[MPa] elongation
[%] sticky
[nN] Transparency anti-fogging formability cleavage wrap film One 42 500 54 ◎ ◎ ◎ ◎ 2 48 580 48 ◎ ◎ ◎ ◎ 3 42 360 71 ◎ ◎ ○ ◎ 4 36 630 65 ◎ ◎ ○ ◎ 5 44 480 44 ◎ ◎ ◎ ◎ 6 43 450 47 ◎ ◎ ○ ◎ Comparative Example Wrap Film One 40 490 53 ◎ △ ◎ ◎ 2 48 570 49 ◎ △ ◎ ◎ 3 × × × × × × × 4 40 480 28 ◎ ◎ ◎ ◎ 5 37 530 32 ◎ ◎ ◎ ◎ 6 39 460 17 ◎ ◎ ◎ ◎ 7 37 430 34 ◎ ◎ ◎ ◎ 8 51 270 32 ◎ ◎ ○ ◎ 9 50 240 32 ◎ ◎ ○ ◎ demand over 35 350 or more over 40 ○More ○More ○More ○More

From Table 3, it can be seen that all of the Wrap films 1 to 6 obtained in Examples 7 to 12 satisfy tensile strength and elongation, and exhibit excellent adhesion, as well as satisfactory transparency, anti-fogging properties, formability, and cutability.

On the other hand, Comparative Example Film 1 and Comparative Example Film 2 used the antifogging agent 2 used in the prior art instead of the antifogging agent 1 of the present invention as the antifogging agent. Able to know. In addition, in Comparative Example Film 3, as a result of using the antifogging agent 2 as well as using an excessive amount, all properties could not be measured. It can be seen that the remarkably lowered, a synergistic effect can be confirmed for the parallel use of the copolymer and the adhesive resin. In addition, it can be seen that Comparative Examples Films 7 to 9 had an adverse effect on one or more properties of elongation, tackiness, and moldability as a result of including only one or all of the thermoplastic elastomer A and the thermoplastic elastomer B.

Although the present invention has been described with reference to preferred embodiments as described above, it is not limited to the above-described embodiments, and various methods can be made by those of ordinary skill in the art to which the invention pertains without departing from the spirit of the present invention. Changes and modifications will be possible.

Claims (11)

30 to 70% by weight of a polypropylene-based resin;
1 to 20% by weight of thermoplastic elastomer A;
5 to 40% by weight of thermoplastic elastomer B;
1 to 30% by weight of the copolymer;
1 to 30% by weight of the adhesive resin; and
0.1 to 5% by weight of an antifogging agent; Wrap film composition comprising a.
The method of claim 1,
The polypropylene-based resin is a wrap film composition, characterized in that it is a homopolymer having only a propylene unit or a binary copolymer further having an ethylene unit in the polymer molecular chain.
The method of claim 1,
The thermoplastic elastomer A is any one selected from the group consisting of Triblock copolymer based on styrene and ethylene/butylene, High 1,2 butadiene, coupled hydrogenated styrene-butadiene (S-EB)x Polymer,
The thermoplastic elastomer B has a propylene repeat unit with random ethylene distribution structure, and a Melt Index of 0.1 to 30g/10min (190°C, 2.16 Kgf) Wrap film composition.
The method of claim 1,
The copolymer is a copolymer resin containing 4 to 40% of polar groups, and a wrap film composition, characterized in that the melt index is 0.1 to 25 g/10 min.
The method of claim 1,
The adhesive resin is a petroleum resin, a rosin resin, a rosin derivative resin, polybutylene (PB), a wrap film composition, characterized in that at least one selected from the group consisting of polyisobutylene (PIB).
5. The method of claim 4,
The petroleum resin is any one selected from the group consisting of aliphatic (C5-based) petroleum resins, aromatic-based (C9-based) petroleum resins, C5/C9 copolymer-based petroleum resins, alicyclic petroleum resins, and hydrides thereof,
The rosin resin is unmodified rosin (raw rosin) including gum rosin, wood rosin, and tall oil rosin, and modified rosin (hydrogenated rosin) modified by at least one of hydrogenation, disproportionation, and polymerization of the unmodified rosin. , disproportionated rosin, polymerized rosin, chemically modified rosin) is any one selected from the group consisting of,
The rosin derivative resin may include rosin esters including an esterified product of unmodified rosin and an esterified product of modified rosin; unsaturated fatty acid modified rosins obtained by modifying unmodified rosin or modified rosin with unsaturated fatty acids; unsaturated fatty acid-modified rosin esters obtained by modifying rosin esters with unsaturated fatty acids; Rosin alcohols obtained by reducing the carboxyl group in unmodified rosin, modified rosin, unsaturated fatty acid modified rosin or unsaturated fatty acid modified rosin ester; metal salts of unmodified rosin, modified rosin, and rosin esters; Wrap film composition, characterized in that any one selected from the group consisting of: unmodified rosin, modified rosin, and rosin phenol resin obtained by thermal polymerization by adding phenol to rosin esters with an acid catalyst.
The method of claim 1,
The antifogging agent Wrap film composition, characterized in that it comprises at least one selected from the group consisting of C ₁₀ ~ C ₂₀ fatty acid and glycerol or polyglycerol esters and derivatives thereof.
The method of claim 1,
The antifogging agent Wrap comprising esters and derivatives thereof obtained by reacting fatty acids containing lauric acid (C12) and stearic acid (C18) fatty acids in a ratio of 1:1 to 1:3 with glycerol or polyglycerol film composition.
A Wrap film, characterized in that it is made of the Wrap film composition of any one of claims 1 to 8.
10. The method of claim 9,
Wrap film, characterized in that it is a single layer and has a thickness of 5 to 30 μm.
10. The method of claim 9,
Wrap film, characterized in that the tensile strength of 35 MPa or more, the elongation of 350% or more, and the adhesiveness of 40 nN or more.