| 摘要 |
<p>1422852 Copolyetheresters E I DU PONT DE NEMOURS & CO 19 June 1973 [20 June 1972] 29059/73 Heading C3R A segmented thermoplastic copolyetherester comprises long- and short-chain ester units derived from a poly-(alkylene oxide)glycol of molecular weight 400-6000 and a carbon to oxygen ratio of 2À0 : 1 to 4À3 :1, a diol of molecular weight not greater than 250, and a dicarboxylic acid of molecular weight not greater than 300, at least 70% of which is 2,6- naphthaline dicarboxylic acid, and wherein at least 70% of the short-chain ester units are identical and the copolyetherester contains 66- 95% by weight of the short-chain ester units. The examples describe Copolyetheresters prepared from (a) dimethyl-2,6-naphthalene dicarboxylate, 1,4-butanediol and poly-(tetramethylene ether)glycol of molecular weight 980, poly-(propylene ether)glycol of molecular weight 1000 or a block copolyether glycol containing ethylene ether and propylene ether units of molecular weight 1150, and (b) dimethyl-2,6- naphthalene dicarboxylate, ethylene glycol and poly-(tetramethylene ether)glycol of molecular weight 980 or the above block copolyether glycol. The copolyetheresters may be mixed with stabilizers and inorganic fillers, e.g. carbon black, silica gel, alumina, clay or chopped fibreglass.</p> |
