Patent ID: 6951340
Filing Date: 2005-10-04
Classification: B65D,C08G,C09K,F16J,Y10T

Abstract:
1. A gasket member for a substrate-holding container formed from a thermoplastic polyester-based elastomer resin containing absolutely no softening agent, of which the surface hardness according to JIS K6301 does not exceed 80A and the amount of gas emission does not exceed 10 ppm based on the weight of the material when heated for 60 minutes at 80° C. wherein the aforementioned thermoplastic polyester-based elastomer resin is a block copolymer consisting of polybutyleneterephthalate as a hard constituent and polytetramethyleneglycol as a soft constituent, the composition weight proportion of said hard constituent to said soft constituent being in the range from 4:1 to 3:1.