Resin composition comprising polyphenylene ether, polyolefin resin and aliphatic polycarboxylic acids

A process for producing a resin composition which consists of melting and kneading in the presence of a radical generator selected from the group consisting of halogenated imides, organic peroxides, persulfates and diazo compounds (A) a polyphenylene ether resin, (B) a polyolefin resin and (D) an aliphatic polycarboxylic acid derivative represented by the following general formula:

• (R.sub.1 O).sub.m R(COOR.sub.2).sub.n (CORN.sub.3 R.sub.4).sub.s
• wherein R represents a saturated hydrocarbon group having 2 to 20 carbon atoms with a linear or branched chain;
• R.sub.1 represents a hydrogen atom or an alkyl, aryl, acyl or carbonyldioxy group having 1 to 10 carbon atoms;
• each R.sub.2 represents a hydrogen atom or an alkyl or aryl group having 1 to 20 carbon atoms;
• R.sub.3 and R.sub.4 each represents a hydrogen atom or an alkyl or aryl group having 1 to 10 carbon atoms;
• m represents a number equal to 1 or 2;
• (n+s) is larger than or equal to 2, and n and s are each larger than or equal to 0;
• (OR.sub.1) is in an alpha or beta position with respect to a carbonyl group, and at least two carbonyl groups are separated by 2 to 6 carbon atoms, wherein at least a part of (A), at least a part of (B) and at least a part of (D), are melted and kneaded simultaneously at a temperature of 150.degree. to 400.degree. C.