PROCESS OF PRODUCING ACID-MODIFIED POLYPHENYLENE ETHER AND POLYSTYRENIC RESIN COMPOSITION

摘要

A process of producung an acid-modified polyphenylene ether by reacting 100 pts. by wt. of polyphenylene ether (a) with 0.1 to 5.0 pts. by wt. of fumaric acid or its derivative (b) at 300 to 350 DEG C, substantially without any solvent, optionally by the use of 0.1 to 5.0 pts. by wt. of a free-radical generator (c) having a one-minute half-life temperature of 300 DEG C or above; and a polystyrenic resin composition comprising 100 pts. by wt. of a syndiotactic styrenic polymer or a mixture thereof with a rubbery elastomer and/or a polyamide (d), 0.5 to 5.0 pts. by wt. of an acid-modified polyphenylene ether (e) produced by the above process and, if necessary, 0.5 to 350 pts. by wt. of an inorganic filler (f). The above process permits stable and simple production of an acid-modified polyphenylene ether being inhibited from decrease in molecular weight without worsening the working atmosphere, and the use of the acid-modified polyphenylene ether makes it possible to provide a polystyrenic resin composition having high toughness.