JPS59197457A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide a thermoplastic resin compsn. having good resistance to impact, heat and weather as well as excellent weld strength, by blending a specified rubbery polymer and an epoxy group-contg. polyolefin copolymer with a polycarbonate. CONSTITUTION:A rubbery polymer obtd. by polymerizing at least two compds. selected from an arom. vinyl compd. (e.g. styrene), a vinyl cyanide (e.g. acrylonitrile) and an alkyl unsaturated carboxylate (e.g. methyl acrylate) in the presence of a rubbery polymer (selected from among an acrylate ester polymer, chlorinated polyethylene and an ethylene/vinyl acetate copolymer) is used. 0.1- 40pts.wt. epoxy group-contg. olefin copolymer is blended with 100pts.wt. compsn. consisting of 90-10wt% polycarbonate and 10-90wt% said polymer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel thermoplastic resin composition having excellent weld strength.

Polycarbonate has traditionally been widely used as an engineering plastic with excellent impact resistance and heat resistance. Additionally, various polymer blends that take advantage of the characteristics of polycarbonate have been developed.

For example, acrylonitrile-acrylic resin composition mixed with mousstyrene polymer (Japanese Patent Publication No. 47-41424), acrylonitrile-
Resin composition with excellent stain resistance mixed with chlorinated polyethylene-styrene polymer (Japanese Patent Publication No. 48-42452),
These include acrylonitrile-ethylene/acetic acid, a resin composition with excellent processability mixed with vinyl rubber and styrene polymer (Japanese Patent Application Laid-Open No. 50-14752), and the like.

However, the strength I of the weld portion produced in injection molding, which is the most common molding method, is insufficient, and it is difficult to say that it is a practically excellent material.

As a result of intensive research into improving the weld strength of such compositions made of polycarbonate and polymer, the present inventors surprisingly discovered that an olefin copolymer containing an epoxy group was distributed in the composition of polycarbonate and polymer. It was discovered that by doing so, the weld strength was significantly improved in addition to impact resistance, heat resistance, and weather resistance, and the present invention was achieved based on this finding.

That is, the present invention comprises 10 to 90% by weight of polycarbonate (A) and a rubbery polymer selected from the group consisting of an acrylic ester polymer, a chlorinated polyethylene, and an ethylene-vinyl acetate copolymer. Modified polymer (B)
A thermoplastic resin having excellent impact resistance, heat resistance, and weather resistance as well as excellent weld strength, characterized by adding an epoxy group-containing olefin copolymer (C) to a composition consisting of 90 to 10% by weight. The present invention provides a fat composition.

The thermoplastic resin composition of the present invention will be explained in detail below.

Examples of the polycarbonate (A) include aromatic polycarbonates, aliphatic polycarbonates, aliphatic-aromatic polycarbonates, and the like.

In general, ha2.2-bis(4-oxyphenyl)alkanes, bis(4-oxyphenyl)ethers, bis(4-oxyphenyl)
-oxyphenyl) sulfone, sulfide, or sulfoxide type bisphenols, and is a polymer using bisphenols substituted with norogen depending on the purpose.

For the manufacturing method and types of polycarbonate, please refer to I Polycarbonate Resin (1968) published by Nikkan Kogyo Shimbun.
(Published September 30, 2016).

The rubbery polymer constituting the polymer (B) is a polymer mainly composed of metinope acrylate, ethyl acrylate, butyl acrylate, propyl acrylate, etc., as well as styrene,
From acrylic acid ester polymers (1), including copolymers with other copolymerizable monomers such as acrylonitrile and methyl methacrylate, chlorinated polyethylene (11), and ethylene-vinyl acetate copolymers (iii) One or more polymers selected from the group consisting of: Furthermore, examples of aromatic vinyl compounds include styrene, α-methylstyrene, dimethylstyrene, vinyltoluene, and the like. With vinyl cyanide compounds.

Examples include acrylonitrile, methacrylonitrile, and the like.

Examples of the unsaturated carboxylic acid alkyl ester compound include methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, and the like.

There is no particular restriction on the composition ratio of the rubbery polymer and the compound mixture for polymerization in the polymer (B), but rubbery polymers 5 to 5
70% by weight, preferably 95-30% by weight of the compound mixture. In addition, there is no particular restriction on the composition ratio of each compound in the compound mixture for polymerization, but 50 to 80% by weight of an aromatic vinyl compound and a vinyl cyanide compound and/or
or unsaturated carboxylic acid alkyl ester compound 50~
It is preferable that the weight is 20% by weight.

Examples of methods for producing the polymer (B) include known emulsion polymerization methods, suspension polymerization methods, bulk polymerization methods, solution polymerization methods, emulsion-suspension polymerization methods, and bulk-suspension polymerization methods.

The composition ratio of polycarbonate (A) and polymer (B) is 10 to 90% by weight of polycarbonate and 90 to 1% by weight of polymer.
It is 0% by weight. If the polycarbonate content is less than 10% by weight, the heat resistance will be significantly reduced and the weld strength will also be low, which is not preferable. Moreover, if it exceeds 90% by weight, processability will be significantly reduced and the appearance will be poor, which is not preferred in practice.

Epoxy group-containing olefin copolymer (Q is a copolymer consisting of an unsaturated epoxy compound and an olefin, or these and an ethylenically unsaturated compound. Although there is no restriction, it is preferable that the epoxy compound content is 0.05 to 95% by weight.

The unsaturated epoxy compound has an unsaturated group copolymerizable with an olefin and an ethylenically unsaturated compound and an epoxy group in the molecule, for example, the following general formula (1),
These are unsaturated epoxy compounds such as unsaturated glycidyl esters, unsaturated glycidyl ethers, epoxy alkenes, and P-glycidyl styrenes as represented by (n) and (1).

1 R-C-0-CH, -CH-C,H, (1)\1 (R is a C9-1!l hydrocarbon group having an ethylenically unsaturated bond.) R-X-CH, -CH-C4 (1) \1 (R is a c, 1-18 hydrocarbon group having an ethylenically unsaturated bond. X is -CH, -0-1R-C-CH1
1 (It (R is a C9-.8 hydrocarbon group having an ethylenically unsaturated bond. Z is hydrogen or a methyl group.) Specifically, glycidyl acrylate, glycidyl methacrylate, itaconic acid glycidyl esters, Butene carboxylic acid esters, allyl glycidyl ether, 2-
Methyl allyl glycidyl ether, styrene-P-glycidyl ether, 3.4-epoxybutene, 3.4-epoxy-3-methyl-1-butene, 3.4-epoxy-
Examples include 1-pentene, 3,4-epoxy-3-methylpentene, 5,6-epoxy-1-hexene, vinylcyclohexene monoxide, and P-glycidylstyrene.

As olefins, ethylene, propylene, butylene/-
Examples include 1,4 methylpentene-1.

In addition, as ethylenically unsaturated compounds, olefins,
Vinyl esters containing C2 to 1 as a saturated carboxylic acid component, acrylic and methacrylic esters and maleic esters containing C1 to S as a saturated alcohol component, vinyl halides, vinyl ethers, N-vinyl lactams , carboxylic acid amides, etc.

When copolymerizing an unsaturated epoxy compound and an olefin, these ethylenically unsaturated compounds are
It is copolymerized in an amount of 0% by weight or less, particularly 0.1 to 45% by weight.

The epoxy group-containing olefin copolymer (C) can be produced by various methods. For example, an unsaturated epoxy compound and an olefin, in some cases an ethylenically unsaturated compound, are mixed in the presence of a radical generator at a pressure of 50 to 4000 atm.
Examples include a method of contacting at 300° C., and a method of mixing polypropylene with an unsaturated epoxy compound and irradiating it with gamma rays under high vacuum to prepare a polymer.

There is no particular restriction on the amount of epoxy group-containing olefin copolymer (0) added, but polycarbonate (4) and polymer (B
) is particularly preferably 0.1 to 40 parts by weight per 100 parts by weight.

If it is less than 0.1 part by weight, there will be problems with dispersibility, and if it is less than 0.1 part by weight,
If the amount exceeds 1 part by weight, delamination tends to occur in the molded product.

There is no restriction on the mixing order of the polycarbonate, the polymer, and the epoxy group-containing onfin copolymer, and it is also possible to mix only two of these three components in advance, and then add and mix the other component. , the three components may be mixed all at once.

Furthermore, the mixing method includes a known mixing method using a Banbury mixer, a single screw extruder, a twin screw extruder having a kneading block, and the like.

In addition, during mixing, polyolefin resins such as polyethylene, polypropylene, and ethylene-propylene copolymers, as well as known dyes and pigments, stabilizers, plasticizers, antistatic agents,
It is also possible to add ultraviolet absorbers, lubricants, fillers, etc.

The present invention will be specifically explained below using Examples, but the present invention is not limited to these in any way.

Polycarbonate, polymer, and epoxy group-containing olefin copolymer were mixed at once based on the blending ratio shown in Table 1 to obtain various compositions (sample numbers 1 to 8). Table 2 shows the physical properties of the obtained composition.

The polymers and epoxy group-containing olefin copolymers used in the Examples and Comparative Examples were obtained by the following formulations. Note that the polycarbonate is commercially available.

0 polycarbonate (A) Teijin Kasei Co., Ltd. Panrai) L-1250W70 polymer (
B) (1) Polymer B-1 was obtained by polymerizing 30 parts by weight of polybutyl acrylate latex, 50 parts by weight of styrene, and 20 parts by weight of acrylonitrile based on a known emulsion polymerization method.

(11) Chlorinated polyethylene 3 with chlorine content of 30% by weight
0 parts by weight, 50 parts by weight of styrene, and 20 parts by weight of acrylonitrile were polymerized based on a known solution polymerization method to obtain a polymer B-I+.

(Di) 30 parts by weight of ethylene-vinyl acetate (40/60) copolymer, 50 parts by weight of styrene, and 20 parts by weight of acrylonitrile were polymerized based on a known solution polymerization method to obtain polymer B.

0 epoxy group-containing olefin copolymer (C) 200071/
Add the crAi compressed ethylene monomer, glycidyl methacrylate and vinyl acetate along with the catalyst (di-t-butyl peroxide) and, with stirring,
3001: for several minutes, and the copolymer (C) was separated through a separator and taken out.

Claims (1)

[Scope of Claims] 1) 10 to 90% by weight of polycarbonate (A), and one or more rubbers selected from the group consisting of acrylic ester polymers, chlorinated polyethylene, and ethylene-vinyl acetate copolymers. A polymer (B) obtained by polymerizing two or more compounds selected from the group consisting of an aromatic vinyl compound, a vinyl cyanide compound, and an unsaturated carboxylic acid alkyl ester compound in the presence of a solid polymer (B) 90 to 10% by weight A thermoplastic resin composition characterized by adding an epoxy group-containing olefin copolymer (Q) to a composition consisting of , i to 40 parts by weight of the thermoplastic resin composition according to claim WJ1. 3) Epoxy group-containing olefin copolymer (Q is a copolymer consisting of an epoxy group-containing compound and an olefin) The composition according to claim 1. 4) The epoxy group-containing olefin copolymer (C) is a copolymer consisting of an epoxy group-containing compound, an olefin, and an ethylenically unsaturated monomer. The composition according to item 1. 5) The composition according to claim 3 or 4, wherein the olefin is one or more compounds selected from ethylene and α-olefin. 6) The composition according to claim 5, wherein the α-olefin is propylene.