Patent ID: 6177537
Filing Date: 2001-01-23
Classification: C08G,G11B

Abstract:
A polycarbonate comprising:(a) carbonate structural units corresponding to structure (I) ##STR21##whereR.sub.1, and R.sub.2, are independently selected from the group consisting of C.sub.1 -C.sub.6 alkyl, R.sub.3 is C.sub.1 -C.sub.3 alkyl and n is 0,1,2,3 or 4 and(b) carbonate structural units corresponding to structure (II) ##STR22##whereR.sub.4, R.sub.5, R.sub.8 and R.sub.9 are independently C.sub.1 -C.sub.6 alkyl,R.sub.6 and R.sub.7 are independently H or C.sub.1 -C.sub.5 alkyl,R.sub.10 is H or C.sub.1 -C.sub.3 alkyl and n is 0,1,2 or 3;wherein the polycarbonate has a glass transition temperature of from about 120.degree. C. to about 185.degree. C. and a water absorption of less than about 0.33%.