Polyphenylene ether resin composition

Details Polyphenylene ether resin composition Polyphenylene ether resin composition

1996-11-25

1998-02-10

Reddick, Judy M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524117, 524119, 524120, 524128, 524147, 524148, 524149, 524151, 524153, 524505, C08K 549

Patent

active

057170142

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a novel resin composition containing polyphenylene ether (hereinafter referred to as "PPE") as a main component and having excellent impact resistance, rigidity and heat resistance.


BACKGROUND ART

In the prior art, as a thermoplastic resin having excellent heat resistance and mechanical and electric properties, PPE obtained by subjecting 2,6-dimethylphenol to oxidative coupling polymerization has been known widely. However, the above PPE has high melting temperature and poor melt fluidity so that it has a drawback that molding processability is inferior. In order to remove such a drawback, various methods have been proposed, and there have been disclosed, for example, 1 a method of formulating other resin into PPE, i.e., a method of formulating a styrene type resin into PPE (U.S. Pat. No. 3,383,435) and a method of formulating a polymer such as a polyamide, polyethylene terephthalate, polybutylene terephthalate, etc. into PPE (Japanese Patent Publication No. 997/1970, Japanese Provisional Patent Publications No. 159847/1984 and No. 75662/1974, etc.). However, in these methods, inherent characteristics, particularly heat resistance in a final composition are impaired in many cases.
Also, as a method for improving impact resistant strength by improving compatibility of a thermoplastic resin and PPE, there have been proposed 2 a method of formulating a polyamide into PPE and further formulating, for example, a compound having a carbon-carbon double bond and a functional group such as a carboxyl group, an acid anhydride group, an acid amide group, an imide group, etc. as a third component (Japanese Provisional Patent Publication No. 26913/1981) and 3 a method of formulating a copolymer of a styrene type compound and an .alpha.,.beta.-unsaturated dicarboxylic acid (Japanese Patent Publication No. 33614/1984), etc., but impact resistant strength is not sufficient, and further improvement has been demanded.
In order to improve the impact resistant strength of a multicomponent type polymer blend material of PPE and a thermoplastic resin such as a polyamide, etc., it is considered to mix and disperse an elastomer which is an impact resistant strength improver, and there have been proposed 4 a method in which in a three-component type material comprising PPE, a polyamide and an elastomer, when the melt viscosities of PPE and the polyamide satisfy a specific relation, said material is made a multilayer structure material in which the polyamide is a continuous phase, PPE is a primary dispersed phase and the elastomer is further dispersed in the primary dispersed phase of PPE (Japanese Provisional Patent Publication No. 273254/1987), 5 a thermoplastic resin composition which is a mixed composition containing a polyamide, PPE and a specific styrene type elastomer as a third component and has a structure that the polyamide forms a continuous phase and PPE exists as a dispersed phase having an average particle size of 0.1 to 10 .mu.m in this continuous phase (Japanese Provisional Patent Publication No. 79258/1989), and 6 a method for improving impact resistance by formulating a block copolymer (a hydrogenated compound) having a specific molecular structure in PPE (Japanese Provisional Patent Publication No. 181552/1991, etc.).
Further, as a method for improving the impact resistant strength of a composition by using a block copolymer which is an impact resistant strength improver and selectively controlling a dispersed state in a PPE dispersed phase, there has been disclosed a method for improving impact resistant strength to a great extent and forming an ideal dispersion form by controlling the ratio of the melt viscosity of a block copolymer to the melt viscosity of PPE to a certain specific range (Japanese Provisional Patent Publication No. 84063/1991).
An object of the present invention is to provide a PPE resin composition which comprises PPE and a partially hydrogenated aromatic alkenyl compound-conjugated diene block copolymer having a hydroxy group and has excellent mo

REFERENCES:
patent: 4383066 (1983-05-01), Sugio et al.
patent: 4472546 (1984-09-01), Sugio et al.
patent: 4489186 (1984-12-01), Sugio et al.
patent: 5061753 (1991-10-01), Maruyama et al.
patent: 5420184 (1995-05-01), Tsukahara et al.
patent: 5468530 (1995-11-01), Go tz et al.

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