Patent ID: 8609786

Claim:
A method of making a thermoplastic composition, the method comprising reacting a melt reaction mixture comprising: a first polycarbonate comprising repeat units derived from monomers (II), (III), and (IV), wherein monomer (II) is a first dihydroxy compound of the formula: wherein n is 0 to 4 and R f1 is a halogen, a C 1-10 hydrocarbon group, or a C 1-10 halogen-substituted hydrocarbon group; monomer (III) is a second dihydroxy compound not the same as monomer (II) and of the formula: wherein m is 1 to 4, and R f2 is a halogen, a C 1-10 hydrocarbon group, or a C 1-10 halogen-substituted hydrocarbon group; and monomer (IV) is a third dihydroxy compound of the formula: wherein R a and R b are each independently a halogen or C 1-12 alkyl group that is meta to the hydroxy group on the same aromatic ring; R c and R d each independently represent a C 1 -C 12 alkyl group that is ortho to the hydroxy group on the same ring; p and q are each independently integers of 0 to 2; v and w are each independently integers of 0 to 2; and X a is a single bond or a bridging group; wherein the sum of the mole percent of the repeat units derived from monomers (II) and (III) is greater than or equal to 30 mole percent, based on the total moles of the repeat units derived from monomers (II), (III), and (IV) in the first polycarbonate, the mole percent of the repeat units derived from monomer (IV) is 5 to 70 mole percent, based on the total moles the repeat units derived from monomers (II), (III), and (IV), and the total weight of the repeat units derived from monomers (II), (III), and (IV) is greater than or equal to 90 wt. % of the first polycarbonate; and an additional polycarbonate, comprising 50 to 100 mole percent of repeat units derived from a bisphenol cyclohexylidene of the formula (VI): wherein R c1 and R d1 are each independently C 1-12 alkyl, R c2 and R d2 are each independently hydrogen or C 1-12 alkyl, R g is C 1-12 alkyl or halogen, and t is 0 to 10; and 0 to 50 mole percent of repeat units derived from a dihydroxy aromatic compound of formula (VIII): wherein R e and R f are each independently a halogen or C 1-10 alkyl group; r and s are each independently integers of 0 to 4; X a is a single bond or a bridging group connecting the two hydroxy-substituted aromatic groups; and the dihydroxy aromatic compound of formula (VIII) is not the same as the bisphenol cyclohexylidene of formula (VI); in the presence of a catalyst for the reaction of the first polycarbonate and the additional polycarbonate.