Patent ID: 8017678

Claim:
A polyester resin composition comprising (a) a polyester resin containing (b) a sulfonamide compound metal salt which has a structure selected from groups of the following general formulae (1), (2) and (3): (in the formula (1), R and R′ each independently represent a hydrogen atom, a halogen atom, an alkali metal atom, an amino group, an alkyl group which has 1 to 10 carbon atoms and which may be branched or substituted, an alkoxy group which has 1 to 10 carbon atoms and which may be branched or substituted, or a cyclic group which has 3 to 30 carbon atoms and which may be substituted; R and R′ may be bonded together to form a cyclic group; n represents a number of 1 or 2; (in the formula (2), R′ has the same meaning as in the formula (1), and R″ represents a linking group which may be substituted (an alkylene group having 1 to 12 carbon atoms, an alkenylene group having 2 to 12 carbon atoms, a cycloalkylene group having 3 to 8 carbon atoms, an alkylene group having an ether bond and 4 to 20 carbon atoms, an alkylene group interrupted by a cycloalkylene group and having 5 to 20 carbon atoms, an arylene group having 6 to 12 carbon atoms, or a combination thereof)), and, (in the formula (3), R has the same meaning as in the formula (1), and R″ has the same meaning as in the formula (2)), and wherein M in the general formulae (1), (2) and (3) is an alkali metal atom; wherein the polyester resin (a) is selected from the group consisting of polyethylene terephthalate (PET), polyethylene naphthalate (PEN) and polybutylene terephthalate (PBT); and, wherein the sulfonamide compound metal salt (b) is mixed in an amount of 0.01 to 10 parts by mass relative to 100 parts by mass of the polyester resin (a).