초록 ▼

A slow speed wheel with high abrasion resistance, good riding attributes and excellent bounce from a composition comprising at least 20 wt % of a segmented thermoplastic copolyester or a blend of copolyesters consisting of essentially of a multiplicity of recurring long chain ester units and short c

A slow speed wheel with high abrasion resistance, good riding attributes and excellent bounce from a composition comprising at least 20 wt % of a segmented thermoplastic copolyester or a blend of copolyesters consisting of essentially of a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, said long chain ester units being represented by the formula (A): [ STR 1 ] and said short chain units being represented by the formula (B): [ STR 2 ] wherein said short chain ester units make up between about 10 to about 95 wt % of said copolyester or blend of copolyesters; G is a divalent radical remaining after the removal of terminal hydroxyl groups from a polyether glycol copolymer based on poly(propylene oxide) and poly(ethylene oxide); R is a divalent radical remaining after removal of carboxyl groups from a aromatic dicarboxylic acid; D is a divalent radical remaining after removal of hydroxyl groups from a diol.

대표청구항 ▼

[ We claim:] [1.] A slow speed wheel composition comprising at least 20 wt % of a segmented thermoplastic copolyester or a blend of copolyesters consisting essentially of a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, said l

[ We claim:] [1.] A slow speed wheel composition comprising at least 20 wt % of a segmented thermoplastic copolyester or a blend of copolyesters consisting essentially of a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, said long chain ester units being represented by the formula (A): [ STR 7 ] and said short chain units being represented by the formula (B): [ STR 8 ] wherein said short chain ester units make up between about 10 to about 95 wt % of said copolyester or blend of copolyesters; andG is a divalent radical remaining after the removal of terminal hydroxyl groups from a polyether glycol copolymer based on poly(propylene oxide) and poly(ethylene oxide); said polyether having a number average molecular weight of about 600-5000;R is a divalent radical remaining after removal of carboxyl groups from a aromatic dicarboxylic acid; said aromatic dicarboxylic acidis selected from a group consisting of terphthalic acid, isophthalic acid and phthalic acid or mixtures thereof;D is a divalent radical remaining after removal of hydroxyl groups from a diol having a molecular weight of less than about 250 or mixtures thereof.