JPS62257950A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:The titled composition suitable as materials for various industries requiring heat resistance, having improved heat resistance, obtained by blending a thermoplastic resin with a specific amount of a styrenic polymer having syndiotactic structure. CONSTITUTION:A thermoplastic resin is blended with 1-99wt% styrenic polymer having syndiotactic structure wherein (substituted) phenyl groups as side chains are alternately located in opposite directions based on a main chain consisting of a carbon-carbon bond.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a thermoplastic resin composition, and more particularly to a thermoplastic resin composition with excellent heat resistance.

[Prior art and problems to be solved by the invention] In general, thermoplastic resins have better moldability than other materials and have sufficient rigidity, so they are used in household goods and electrical products. 2. It is used as a molding material for various products such as parts for machinery and equipment.

However, although thermoplastic resins have such excellent properties, they have the drawback of not being sufficiently heat resistant. Although it is effective to add inorganic fillers to improve the heat resistance of thermoplastic resins, various disadvantages occur, such as a decrease in moldability and an increase in specific gravity.

Therefore, the inventors of the present invention have conducted extensive research in order to develop a thermoplastic resin that does not have such disadvantages and has improved heat resistance.

[Means for solving problems]

As a result, they discovered that a thermoplastic resin composition containing a certain proportion of a styrene polymer having a syndiotactic structure has the desired physical properties.
The present invention has now been completed.

That is, the present invention provides a thermoplastic resin composition containing a styrenic polymer mainly having a syndiotactic structure in a proportion of 1 to 99 weight percent.

In the composition of the present invention, it is necessary to mainly contain a styrenic polymer having a syndiotactic structure. This styrenic polymer is mainly syndiotactic (i.e., phenyl groups or substituted phenyl groups or W side chains are located in opposite directions alternately with respect to the main chain formed from carbon-carbon bonds). It has a novel three-dimensional structure, and its toughness is determined by nuclear magnetic resonance (NMR).

Toughness measured by NMR refers to the abundance ratio of a plurality of consecutive structural units; for example, if there are two structural units, it is a diad, and if there are three structural units, it is a triat.

The case of 5 can be represented by a pentad, but
In the present invention, the styrenic polymers mainly having a syndiotactic structure include polystyrene, poly(alkyl styrene), poly(halogenated styrene), poly(alkoxystyrene).

Refers to poly(benzoate styrene), mixtures thereof, or copolymers containing these as main components. Note that poly(alkylstyrene) here includes poly(methylstyrene) and poly(ethylstyrene).
Examples of poly(halogenated styrene) include poly(isopropylstyrene), poly(tert-butylstyrene), and poly(chlorostyrene), poly(bromostyrene). Examples of poly(alkoxystyrene) include poly(methoxystyrene) and poly(ethoxystyrene).

In the thermoplastic resin composition of the present invention, the styrenic polymer having the syndiotactic structure described above must be contained in an amount of 1 to 99% by weight of the entire composition. If it is less than 1% by weight, the effect of improving the heat resistance of the thermoplastic resin will not be sufficient, and if it exceeds 99% by weight, the purpose of the present invention, which is to improve the heat resistance of general thermoplastic resins, will be lost.

The base of the composition of the present invention is a general thermoplastic resin other than the above-mentioned styrenic polymer having a syndiotactic structure. Various thermoplastic resins can be selected depending on the intended use of the composition, and there are no particular limitations.

For example, styrene polymers such as acute structure polystyrene, isotactic structure polystyrene, AS resin, and Al3S resin, condensation polymers such as polyester, polycarbonate, polyether, polyamide, and polyoxymethylene, and polyacrylic acid.

Acrylic polymers such as polyacrylic acid ester and polymethyl methacrylate, polyolefins such as polyethylene, polypropylene, polybutene, poly4-methylpentene-1, and ethylene-propylene copolymers, or polyvinyl chloride, polyvinylidene chloride, and polyfluoride. Examples include halogen-containing vinyl compound polymers such as vinylidene chloride.

In the present invention, a styrenic polymer with a syndiotactic structure having a novel three-dimensional structure is blended with the above-mentioned general thermoplastic resin, and if necessary, moldability, stability, mechanical strength, etc. In order to improve the properties, conventionally used lubricants, oxidation stabilizers, inorganic fillers, etc. can be added.

In the present invention, when kneading the styrene polymer mainly having a syndiotactic structure, a general thermoplastic resin, and other components added as desired, conditions may be selected as appropriate depending on the situation, but in general, may be carried out by ordinary melt kneading using a Banbury mixer, a Henschel mixer or a kneading roll.

〔Effect of the invention〕

The thermoplastic resin composition of the present invention thus obtained has significantly improved heat resistance compared to conventional general thermoplastic resins.

Therefore, the thermoplastic resin composition of the present invention can be widely and effectively used in various industrial materials, machine parts materials, etc. that require heat resistance.

〔Example〕 Next, the present invention will be explained in more detail with reference to Examples.

Reference Example 1 In a reaction vessel, l.luene 21 as a solvent and cyclopentadienyl titanium trichloride 2 as a catalyst component were placed in a reaction vessel.
0 mmol and 0.8 mol of methylaluminoxane as aluminum atoms were added, and 3.61 mol of styrene was added at 20°C to carry out a polymerization reaction for 1 hour. After the reaction was completed, the product was washed with a hydrochloric acid-methanol mixture to decompose and remove the catalyst component. It was then dried to obtain 330 g of a polymer.

Next, this polymer was subjected to Soxhlet extraction using methyl ethyl ketone as a solvent to obtain an extraction residue of 95% by weight. This polymer has a weight average molecular weight of 280,000° and a number average molecular f
f157,000, and the melting point was 270°C. In addition, this polymer can be used for isotopic carbon nuclear magnetic resonance ("C-NMR").
) analysis shows that 1 is based on a syndiotactic structure.
Absorption was observed at 45.35 ppm, and the syndiotacticity in pentad calculated from the peak area was 96%.

Example 1 20 parts by weight of polystyrene with a syndiotactic structure obtained in Reference Example 1 was blended with 80 parts by weight of polycarbonate (trade name: Idemitsu Polycarbonate A2500, manufactured by Idemitsu Petrochemical Department) as a thermoplastic resin, A test piece was prepared by kneading it using a minimant molding machine, and the mechanical strength of this piece was measured. Regarding thermal properties, the Vicat softening point was measured. These results are shown in Table 1.

Example 2 The same operation as in Example 1 was carried out, except that the blending ratio of polycarbonate was 50 parts by weight, and the blending ratio of polystyrene obtained in Reference Example 1 was 50 parts by weight. The results are shown in Table 1.

Example 3 Polyethylene terephthalate (trade name: Vyropeso 1-RY533. manufactured by Toyobo I@) 80 as a thermoplastic resin
The same operation as in Example 1 was performed except that parts by weight were used. The results are shown in Table 1.

Example 4 The same operation as in Example 1 was carried out, except that the blending ratio of polyethylene terephthalate (same as Example 3) was 50 parts by weight, and the blending ratio of polystyrene obtained in Reference Example 1 was 50 parts by weight. Ta.

The results are shown in Table 1.

Example 5 ABS resin (product name: JSRABS) was used as the thermoplastic resin.
15. The same operation as in Example 1 was performed except that 80 parts by weight (manufactured by Nippon Synthetic Rubber Co., Ltd.) was used.

The results are shown in Table 1.

Example 6 The same operation as in Example 1 was carried out, except that the blending ratio of ABS resin (same as Example 5) was 50 parts by weight, and the blending ratio of polystyrene obtained in Reference Example 1 was 50 parts by weight. Ta. The results are shown in Table 1.

Example 7 Polysulfone (trade name Newdel Polysulfone P-1'700. Union Carbide Co., Ltd.) was used as a thermoplastic resin.
I! A) The same operation as in Example 1 was performed except that 80 parts by weight was used. The results are shown in Table 1.

Example 8 The blending ratio of polysulfone (same as Example 7) was 50
The same operation as in Example 1 was performed except that the weight part and the blending ratio of the polystyrene obtained in Reference Example 1 were changed to 1 part of 50ffIB. The results are shown in Table 1.

Comparative Examples 1 to 4 The properties of the individual resins used in Examples 1 to 8, polycarbonate, polyethylene terephthalate Al3S resin, and polysulfone, were measured in the same manner as in Example 1. The results are shown in Table 1.

Claims (1)

[Claims] (1) A thermoplastic resin composition containing 1 to 99% by weight of a styrenic polymer mainly having a syndiotactic structure.