초록 ▼

Block copolymers of the general formula －polycarbonate－G－polyether glycol－wherein G is an ester aromatic carbonate and/or an ester-ester linkage, substantially free of aliphatic ether linkages are thermally stable in comparison with prior art block copolymers. They form compatible blends with a numb

Block copolymers of the general formula －polycarbonate－G－polyether glycol－wherein G is an ester aromatic carbonate and/or an ester-ester linkage, substantially free of aliphatic ether linkages are thermally stable in comparison with prior art block copolymers. They form compatible blends with a number of other thermoplastic resins to produce molded articles with improved resiliency. The block copolymers are produced from novel terminally functional end capped polyalkylene glycols.

대표청구항 ▼

A polycarbonate polyether block copolymer substantially free of aliphatic carbonate linkages, having a mean weight average molecular weight Mw of between about 15,000 and 40,000 and being of the general formula [Figure] wherein repeating units B comprise soft polyether segments comprising from 5 to

A polycarbonate polyether block copolymer substantially free of aliphatic carbonate linkages, having a mean weight average molecular weight Mw of between about 15,000 and 40,000 and being of the general formula [Figure] wherein repeating units B comprise soft polyether segments comprising from 5 to 60% by weight of said block copolymer and have mean number average molecular weights Mn of between about 500 and 20,000, and wherein G is [Figure] [Figure] R is hydrogen, chlorine, bromine or alkyl of from 1 to 3 carbon atoms; m is 1 or 2; X is a bond or C1-C8 alkylene, C2 to C8 alkylidene, C5 to C15 cycloalkylene, C5 to C15 cycloalkylidene, SO2, SO, O, CO or [Figure] r is 6 to 450; and Y is C2-C15 linear or branched alkylene.