Abstract: Disclosed are a thermoplastic resin composition which comprises(A) 10 to 90% by weight of a polyphenylene ether,(B) 90 to 10% by weight of a saturated polyester,(C) 0.1 to 10 parts by weight of an organic phosphorous acid compound represented by the formula: ##STR1## wherein n represents 1 or 2; Ar represents an aryl group having 6 to 30 carbon atoms or a substituted aryl group and when n is 2, Ars may be the same or different; and R represents an alkylene group having 2 to 18 carbon atoms or arylene group when n is 1 and represents an alkanetetrayl group having 4 to 18 carbon atoms when n is 2, based on 100 parts by weight of Components (A) and (B) , and(D) 0 to 10 parts by weight of an acid receptor based on 100 parts by weight of Components (A) and (B),and a process for preparing the same.

Abstract: Disclosed are processes for preparing a process for preparing a modified polyphenylene ether which comprises reacting any one of a borane compound having at least one boronhydrogen bond, an .alpha.,.beta.-unsaturated carbonyl compound or a mercaptane having a carbonyl group, a hydroxyl group or an alkoxysilyl group with a polyphenylene ether having a carbon-carbon unsaturated bond in a substituent, and optionally oxidizing the resulting borane-modified PPE under alkaline conditions.

Abstract: A hydroxy-substituted poly(phenylene ether) resin can be produced by copolymerizing from 1.5 to 8 mol % of a phenol compound selected from those represented by the following formulae (a), (b), (c), (d), and (e): ##STR1## and from 98.5 to 92 mol % of a phenol compound of the following formula (f): ##STR2## The hydroxy-substituted poly(phenylene ether) resin shows excellent compatibility with a polyamide, a polycarbonate, a poly(butylene terephthalate), a poly(phenylene sulfide), and is useful as a copatibilizer or a modified resin for engineering plastics.

Abstract: Disclosed is a process for preparing a polyhydroxyphenylene ether resin which comprises copolymerizing a phenol-substituted compound having hydroxyl group as a substituent, represented by the formula (I): ##STR1## wherein m and n each represents an integer satisfying the formulae 1.ltoreq.m and m+n.ltoreq.4; J represents {(HO).sub.a --R.sup.1 --S}.sub.b --R.sup.2 -- where a and b each represents an integer of 1 to 6; and R.sup.1 and R.sup.2 each represents unsubstituted or halogen-substituted alkylene, alkenylene or arylene, or alkylene; K represents halogen, primary or secondary alkyl, alkenyl, phenyl, aminoalkyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy;with at least one phenol-substituted compound represented by the formula (II): ##STR2## wherein Qs each represents hydrogen, halogen, primary or secondary alkyl, alkenyl, aromatic, aminoalkyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy,and a resin composition containing the polyhydroxyphenylene ether resin prepared by the above method.

Abstract: Disclosed are processes for preparing a process for preparing a modified polyphenylene ether which comprises reacting any one of a borane compound having at least one boron-hydrogen bond, an .alpha.,.beta.-unsaturated carbonyl compound or a mercaptane having a carbonyl group, a hydroxyl group or an alkoxysilyl group with a polyphenylene ether having a carbon-carbon unsaturated bond in a substituent, and optionally oxidizing the resulting borane-modified PPE under alkaline conditions.