Polycarbonate and polyester blends

Claim 1

A blend composition comprising: (A) from 1 to 99 percent by weight of a polycarbonate comprising a diol component comprising from 5 to 100 mol percent units of a diphenol or mixture of diphenols having the formula ##STR6## wherein R 0 , R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are independently selected from the group consisting of hydrogen, halogen, C 1 -C 8 alkyl, C 5 -C 12 cycloalkyl, C 5 -C 12 aryl, and C 6 -C 12 aralkyl, X represents carbon, m is an integer of from 4 to 7, and R 8 and R 9 are independently selected for each X and independently selected of each other from the group consisting of hydrogen and C 1 -C 8 alkyl; 0to about 95 mol percent 4,4'-isopropylidenediphenol units, and about 0 to about 10 mol percent modifying glycol units having 2 to 16 carbons, wherein the total mol percent of diol units is equal to 100 mol percent; and (B) from 1 to 99 percent by weight of a polyester comprising (a) a dicarboxylic acid component comprising from 80 to 100 mol percent 1,4-cyclohexane-dicarboxylic acid units; and from 0 to about 20 mol percent modifying dicarboxylic acid units having from 2 to 20 carbons, wherein the total mol percent of dicarboxylic acid units is equal to 100 mol percent; and (b) a glycol component comprising from 10 to 75 mol percent 2,2,4,4-tetramethyl-1,3-cyclobutanediol units, from 25 to 90 mol percent 1,4-cyclohexanedimethanol units, and from 0 to 10 mol percent modifying glycol units having 2 to 16 carbons, wherein the total mol percent of glycol units is equal to 100 mol percent; wherein the total units of said polyester is equal to 200 mol percent; wherein said blend is clear and the total weight percent of said polycarbonate (A) and said polyester (B) is equal to 100 weight percent.