Patent ID: 6949279

Claim:
A miscible polymer blend selected from the group consisting of: (i) a first polymer A, a second polymer B, a third polymer C, and an optional additive used in optical applications, wherein (A) is a polycarbonate comprising structural units corresponding to structure (I) where R 1 and R 2 independently comprise a C 1 -C 6 alkyl; X comprises CH 2 ; 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 R 1 or R 2 in the 3 or 3′ position, (B) is a polymer comprising structural units corresponding to structure (II) where R 3 comprises a C 1 -C 6 alkyl, hydrogen, cyano or methoxy, and (C) is a polymer comprising structural units corresponding to structure (III) where R 4 , R 5 and R 6 independently comprise a C 1 -C 6 alkyl, (ii) a first polymer A, a second polymer B, a third polymer E, and an optional additive used in optical applications, wherein (A) is a polycarbonate comprising structural units corresponding to structure (I) where R 1 and R 2 independently comprise a C 1 -C 6 alkyl; X comprises CH 2 ; 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 R 1 or R 2 is in the 3 or 3′ position, (B) is a polymer comprising structural units corresponding to structure (II) where R 3 comprises a C 1 -C 6 alkyl, hydrogen, cyano or methoxy, and (E) is a polymer comprising structural units corresponding to structure (V) where R 9 comprises a C 1 -C 6 alkyl, hydrogen, cyano or methoxy; and (iii) a first polymer B, a second polymer C, a third polymer E, and an optional additive used in optical applications, wherein (B) is a polymer comprising structural units corresponding to structure (II) where R 3 comprises a C 1 -C 6 alkyl, hydrogen, cyano or methoxy, (C) is a polymer comprising structural units corresponding to structure (III) where R 4 , R 5 and R 6 independently comprise a C 1 -C 6 alkyl, and (E) is a polymer comprising structural units corresponding to structure (V) where R 9 comprises a C 1 -C 6 alkyl, hydrogen, cyano or methoxy, where the polymer blend has a glass transition temperature of from about 100° C. to about 185° C.