COPOLYCARBONATES, THEIR DERIVATIVES AND THE USE THEREOF IN SILICONE HARDCOAT COMPOSITIONS.

摘要

Disclosed herein are novel copolycarbonates containing repeating units A and B respectively of the formulae: (A) -[R1OC(=0)0]-, and (B) -[(R20)n-C(=O)-O]-, wherein the molar ratio of units (A) to units (B) is in the range of from about 9: 1 to about 1 :9, and wherein R1 is a divalent C8 to C 12 alicyclic group, and R2 is ethylene or propylene, and n is an integer ranging from 4 to 40. Also disclosed are silicone hardcoat compositions containing the copolycarbonates and their derivatives. Upon cure, these silicone hardcoat compositions exhibit improved flexibility as compared to that of the conventional hardcoats while at the same time maintain the abrasion resistance of conventional silicone hardcoats.