Flame retardant polyphenylene ether resin compositions

A flame retardant polyphenylene ether resin composition comprising:

• (a) from about 3 parts to about 10 parts by weight of a phosphine oxide having the formula:
• ##STR4## wherein R.sub.1 may be the same or different radicals selected from the group consisting of hydrogen and the methyl radical, R.sub.2 is an alkyl radical of 4 to 8 carbon atoms and n is either zero or one;
• and
• (b) 100 parts by weight of a polyphenylene oxide graft copolymer composition comprising
• (i) from about 30 to about 90 weight percent of a graft copolymer free from polyphenylene ether homopolymers prepared by polymerizing 20 to 200 parts by weight of styrene-type compound at a temperature in the range from 130.degree. C. to 200.degree. C. in the presence of 100 parts by weight of a polyphenylene ether and 0.1 to 15 parts by weight of a radical initiator, and
• (ii) 10 to 70 weight percent of a styrene-type compound polymer having a number average molecular weight in the range from 50,000 to 200,000.