JPH0755995B2 - Thermoplastic resin composition - Google Patents

Description

The present invention relates to a thermoplastic resin composition, and more particularly to a thermoplastic resin composition having excellent heat resistance.

[Problems to be Solved by Prior Art and Invention]

In general, thermoplastic resins have superior moldability compared to other materials and have sufficient rigidity, so they are used as molding materials for various products such as household products, electrical products, and parts of machinery and equipment. Has been.

However, although the thermoplastic resin has such excellent properties, it has a drawback that it is difficult to say that it is sufficient in terms of heat resistance. In order to improve the heat resistance of the thermoplastic resin, it is effective to add an inorganic filler, but various disadvantages such as a decrease in moldability and an increase in specific gravity occur.

Therefore, the present inventors have conducted earnest research to develop a thermoplastic resin that does not have such inconvenience and has improved heat resistance.

[Means for solving problems]

As a result, it was found that the thermoplastic resin composition containing a styrene-based polymer having a syndiotactic structure at a constant ratio has the desired physical properties,
The present invention has been completed.

That is, the present invention mainly relates to a thermoplastic resin composed of 1 to 99% by weight of a styrene polymer having a syndiotactic structure and 99 to 1% by weight of a thermoplastic resin other than the styrene polymer having a syndiotactic structure. A composition is provided.

In the composition of the present invention, it is necessary to mainly contain a styrene polymer having a syndiotactic structure. This styrene polymer mainly has a syndiotactic structure, that is, a novel three-dimensional structure in which a phenyl group or a substituted phenyl group, which is a side chain, is alternately located in the opposite direction with respect to the main chain formed from carbon-carbon bonds. The tacticity is determined by the nuclear magnetic resonance method (NMR method).

The tacticity measured by NMR can be indicated by the abundance ratio of a plurality of continuous structural units, for example, diad in the case of 2, triad in the case of 3 and pentad in the case of 5 The styrene-based polymer mainly having a syndiotactic structure means polystyrene, poly (alkylstyrene), poly (halogenated styrene), which has a syndiotactic structure of 85% or more in diads or 35% or more in pentads in general. The poly (alkoxystyrene), poly (benzoic acid ester styrene) and mixtures thereof, or copolymers containing these as the main components are referred to. Here, as the poly (alkylstyrene), there are poly (methylstyrene), poly (ethylstyrene), poly (isopropylstyrene), poly (tertiarybutylstyrene), etc., and as the poly (halogenated styrene), Examples include poly (chlorostyrene) and poly (bromostyrene).
Examples of poly (alkoxystyrene) include poly (methoxystyrene) and poly (ethoxystyrene).

In the thermoplastic resin composition of the present invention, the styrene polymer having a syndiotactic structure needs to be blended in the range of 1 to 99% by weight based on the total weight of the composition. If it is less than 1% by weight, the effect of improving the heat resistance of the thermoplastic resin is not sufficient, and if it exceeds 99% by weight, the object of the present invention of improving the heat resistance of general thermoplastic resins is lost.

The thermoplastic resin composition of the present invention comprises a styrene polymer having the syndiotactic structure, and a thermoplastic resin other than the styrene polymer having the syndiotactic structure (hereinafter referred to as a general thermoplastic resin. Sometimes it is). As such a thermoplastic resin, various resins are selected depending on the application of the composition and the like, and are not particularly limited. For example, polystyrene with atactic structure, polystyrene with isotactic structure, AS resin,
In addition to styrene polymers such as ABS resin, condensation polymers such as polyester, polycarbonate, polyether, polyamide, polyoxymethylene, acrylic polymers such as polyacrylic acid, polyacrylic acid ester, polymethylmethacrylate, polyethylene, etc. , Polypropylene, polybutene, poly-4-methylpentene-1, ethylene-propylene copolymers and the like, and halogen-containing vinyl compound polymers such as polyvinyl chloride, polyvinylidene chloride and polyvinylidene fluoride.

In the present invention, the above-mentioned general thermoplastic resin is blended with a styrene-based polymer having a syndiotactic structure having a novel three-dimensional structure. Further, moldability, stability, and mechanical strength are further added as required. In order to improve the above, a lubricant, an oxidation stabilizer, an inorganic filler and the like which have been conventionally used can be added.

In the present invention, when kneading mainly a styrene polymer having a syndiotactic structure and a general thermoplastic resin, and optionally other components to be kneaded, appropriate conditions may be selected depending on the situation, but generally Banbury. Usual melt-kneading with a mixer, a Henschel mixer, a kneading roll, a single-screw extruder, a twin-screw extruder or the like may be used.

〔The invention's effect〕

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

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

〔Example〕

 Next, the present invention will be described in more detail with reference to Examples.

Reference Example 1 Toluene 2 as a solvent in a reaction vessel, 20 mmol of cyclopentadienyl titanium trichloride as a catalyst component, and 0.8 mol of methylaminoxane as an aluminum atom were added, and styrene 3.6 was added at 20 ° C. for 1 hour for polymerization reaction Was done. After the reaction was completed, the product was washed with a hydrochloric acid-methanol mixed solution to decompose and remove the catalyst component. Then, it was 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 280000, a number average molecular weight of 57,000 and a melting point of 270.
It was ℃. This polymer was also found to have an absorption at 145.35 ppm due to the syndiotactic structure from the analysis of isotopic carbon nuclear magnetic resonance ( ¹³ C-NMR), and the syndiotacticity in the pentad calculated from the peak area. Was 96%.

Example 1 As a thermoplastic resin, 20 parts by weight of polystyrene having a syndiotactic structure obtained in Reference Example 1 was mixed with 80 parts by weight of a polycarbonate (trade name: Idemitsu Polycarbonate A2500, manufactured by Idemitsu Petrochemical Co., Ltd.). Then, it was kneaded with a mini mat molding machine to prepare a test piece, and the mechanical strength of this was measured. For the thermal properties, the Vicat softening point was measured. The results are shown in Table 1.

Example 2 The same operation as in Example 1 was carried out except that the mixing ratio of the polycarbonate was 50 parts by weight and the mixing ratio of the polystyrene obtained in Reference Example 1 was 50 parts by weight. First result
Shown in the table.

Example 3 The same operation as in Example 1 was carried out except that 80 parts by weight of polyethylene terephthalate (trade name: Pyropet RY533, manufactured by Toyobo Co., Ltd.) was used as the thermoplastic resin. The results are shown in Table 1.

Example 4 The same operation as in Example 1 was carried out except that the mixing ratio of polyethylene terephthalate (the same as that of Example 3) was 50 parts by weight and the mixing ratio of the polystyrene obtained in Reference Example 1 was 50 parts by weight. It was The results are shown in Table 1.

Example 5 The same operation as in Example 1 was performed except that 80 parts by weight of an ABS resin (trade name: JSRABS15, manufactured by Japan Synthetic Rubber Co., Ltd.) was used as the thermoplastic resin. The results are shown in Table 1.

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

Example 7 The same operation as in Example 1 was performed except that 80 parts by weight of polysulfone (trade name: Udel Polysulfone P-1700, manufactured by Union Carbide) was used as the thermoplastic resin. The results are shown in Table 1.

Example 8 The same operation as in Example 1 was carried out except that the blending ratio of polysulfone (the same as that of Example 7) was 50 parts by weight and the blending ratio of the polystyrene obtained in Reference Example 1 was 50 parts by weight. . The results are shown in Table 1.

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

Example 9 The same operation as in Example 1 was carried out except that the blending ratio of the polycarbonate was 95 parts by weight and the blending ratio of the polystyrene obtained in Reference Example 1 was 5 parts by weight. Second result
Shown in the table.

Example 10 The same operation as in Example 1 was carried out except that the compounding ratio of the polycarbonate was 5 parts by weight and the compounding ratio of the polystyrene obtained in Reference Example 1 was 95 parts by weight. Second result
Shown in the table.

Example 11 The same operation as in Example 3 was carried out except that in Example 3, the mixing ratio of polyethylene terephthalate was 20 parts by weight, and the mixing ratio of the polystyrene obtained in Reference Example 1 was 80 parts by weight. . The results are shown in Table 2.

Claims (2)

[Claims] 1. A thermoplastic resin other than the styrene-based polymer having a syndiotactic structure and 1 to 99% by weight, and the styrene-based polymer having a syndiotactic structure.
A thermoplastic resin composition comprising 99 to 1% by weight. 2. The thermoplastic resin other than the styrene polymer having a syndiotactic structure is polycarbonate, polyethylene terephthalate, ABS resin, polysulfone, polystyrene having an atactic structure, polystyrene having an isotactic structure, polybutylene terephthalate,
The composition according to claim 1, which is at least one resin selected from polyether, polyamide, polyethylene and polypropylene.