Thermoplastic resin composition

A thermoplastic resin composition which comprises (a) 100 parts by weight of a polyphenylene ether resin and (b) 0.001-15 parts by weight of at least one 4-amino-2,2,6,6-tetramethylpiperidyl compound represented by the following formula (I):

• ##STR35## wherein R.sub.1 represents a hydrogen atom, an oxygen atom (oxy radical), a hydroxyl group, an alkyl group having 1-8 carbon atoms, a cycloalkyl group, an allyl group, a benzyl group, an aryl group, an alkanoyl group, an alkenoyl group, an alkyloxy group or a cycloalkyloxy group, and n is an integer of 1 to 4;
• wherein when n is 1, R.sub.2 represents a hydrogen atom, an alkyl group of 1-8 carbon atoms or ##STR36## where X and Y represent one selected from the group consisting of an alkylene group, an alkylidene group, a vinyl group and a vinylidene group, and R.sub.3 is a hydrogen atom, an alkyl group, a cycloalkyl group, an alkenyl group, a benzyl group, an aryl group or ##STR37## in which Z represents a direct bond, --O-- or --NR.sub.8 -- and R.sub.6 represents a direct bond, a straight or branched alkylene group, an alkylidene group or an arylene group, and R.sub.7 and R.sub.8 each represents a hydroxyl group, al alkyl group, an aryl group, ##STR38## wherein when n is 2, R.sub.2 represents a hydrogen atom, an alkyl grup of 1-8 carbon atoms, or ##STR39## in which X and Y represent one selected from the group consisting of an alkylene group an alkylidene group, a vinyl group, and a vinxylidene group and R.sub.3 is an alkylene group or ##STR40## in which R.sub.9 represents a direct bond, a straight or branched alkylene group, an alkylidene group or an arylene group;
• wherein when n is 3, R.sub.2 represents ##STR41## where Q represents a hydrogen atom or an alkyl group of 1-8 carbon atoms and p is an integer of 2 to 8, and R.sub.3 is a group represented by the following formula:
• ##STR42## and wherein when n is 4, R.sub.2 represents a hydrogen atom or an alkyl group of 1-8 carbon atoms, and R.sub.3 is a group represented by the following formula:
• ##STR43##