Patent ID: 6537636
Filing Date: 2003-03-25
Classification: C08L,G11B,Y10T

Abstract:
An optical article comprising a miscible polymer blend, the miscible polymer blend comprisingA) from 1 to 99% by weight of a first polycarbonate comprising structural units having the formula (I) â€ƒwhere R1 and R2 are independently selected from the group consisting of C1-C6 alkyl; X represents CH2; m is an integer from 4 to 7; n is an integer from 1 to 4; and p is an integer from 1 to 4 with the proviso that at least one of R1 or R2 is in the 3 or 3â€² position; â€ƒand wherein the structural units of formula (I) comprise from 1 mol % to about 100 mol % of the first polycarbonate; and B) from 1 to 99% by weight of a second polycarbonate comprising structural units having the formula (II) â€ƒwhere R18 is independently selected from the group consisting of halogen, hydrogen, monovalent C1-C6 hydrocarbon, monovalent C1-C6 hydrocarbonoxy radicals, R19 is independently selected from the group consisting of halogen, hydrogen, monovalent C1-C6 hydrocarbon, and monovalent C1-C6 hydrocarbonoxy radicals; W is selected from the group consisting of substituted or unsubstituted divalent C1-C18 hydrocarbon radicals, â€”Sâ€”, â€”Sâ€”Sâ€”, â€”Oâ€”, each n is independently selected from integers having a value of from 0 to 4 inclusive; and b is zero or one; wherein the structural units of formula (II) comprise from about 1 to about 100 mol % of the second polycarbonate; and wherein the total weight percent of first polycarbonate (A) and second polycarbonate (B) is equal to 100 weight percent.