Patent ID: 7056963

Claim:
A polyester resin composition comprising: a thermoplastic polyester resin and a polyether compound-treated layered material consisting of polyether and layers respectively exfoliated by one another, which satisfies at least one of the conditions (i) to (iii) given below: (i) That said polyether compound is represented by the general formula (2): wherein -A- is —O—, —S—, —SO—, —SO 2 —, —CO—, an alkylene group containing 1 to 20 carbon atoms or an arylene group containing 6 to 20 carbon atoms, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 each represents a hydrogen atom, a halogen atom or a univalent hydrocarbon group containing 1 to 5 carbon atom, R 9 and R 10 each represents a bivalent hydrocarbon group containing 1 to 5 carbon atoms, R 11 and R 12 each represents a hydrogen atom or a univalent hydrocarbon group containing 1 to 20 carbon atoms, those may be the same or different, and m and n each represents the number of occurrences of the repeating oxyalkylene group provided that 2≦m+n≦50; (ii) That said polyester resin composition comprises a phosphorus-containing compound; (iii) That said polyester resin composition is obtainable by melt-kneading the thermoplastic polyester resin and the polyether compound-treated layer material consisting of polyether and layers respectively exfoliated by one another and then treating the mixture for increasing the molecular weight of the polyester resin.