COPOLYCARBONATE COMPOSITIONS

1 . A copolycarbonate composition, comprising a blend of a polycarbonate-polydimethylsiloxane (PC—Si) copolymer and a terephthalate polymer of Formula (IV):

wherein R 10 is a divalent aliphatic or cycloaliphatic radical containing from about 1 to about 10 carbon atoms;

wherein the composition has a melt volume rate of at least 8 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 11.5 ft-lb/inch at minus 40° C., according to ASTM D256.

2 . The composition of claim 1 , wherein the terephthalate polymer is selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and poly(1,4-cyclohexanedimethylene) terephthalate (PCT).

3 . The composition of claim 1 , wherein the terephthalate polymer comprises from about 5 to about 20 weight percent of the copolycarbonate composition.

4 . The composition of claim 1 , wherein the composition has a melt volume rate of at least 12 cc/10 min at 300° C./1.2 kg, according to ASTM D1238.

5 . The composition of claim 1 , wherein the composition has a notched Izod impact strength of at least 12 ft-lb/in at minus 40° C., according to ASTM D256

6 . The composition of claim 1 , wherein the composition has a melt volume rate of at least 12 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 12 ft-lb/in at minus 40° C., according to ASTM D256.

7 . The composition of claim 1 , wherein the PC—Si copolymer is of the general Formula (III):

wherein A is selected from a bond, —O—, —S—, —SO 2 —, C 1 -C 12 alkyl, C 6 -C 20 aromatic, and

C 6 -C 20 cycloaliphatic; each R 5 is independently selected from divalent C 2 -C 8 aliphatic;

each M is independently selected from halogen, cyano, nitro, C 1 -C 8 alkylthio, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, C 2 -C 8 alkenyl, C 2 -C 8 alkenyloxy, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkoxy, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 7 -C 12 arylalkyl, C 7 -C 12 arylalkoxy, C 7 -C 12 alkylaryl, or C 7 -C 12 alkylaryloxy; each n is independently an integer from 0 to 4; x is the mole percentage of the carbonate unit; y has an average value of from about 2 to about 1,000; and z is the mole percentage of the siloxane unit.

8 . The composition of claim 7 , wherein the ratio of x:z is from about 20 to about 500.

9 . The composition of claim 7 , wherein A is isopropylidene.

10 . The composition of claim 1 , wherein the terephthalate polymer has a weight average molecular weight of from about 50,000 to about 110,000.

11 . An article molded from a copolycarbonate composition comprising a blend of a polycarbonate-polydimethylsiloxane (PC—Si) copolymer and a terephthalate polymer of Formula (IV):

wherein R 10 is a divalent aliphatic or cycloaliphatic radical containing from about 1 to about 10 carbon atoms;

wherein the composition has a melt volume rate of at least 8 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 11.5 ft-lb/inch at minus 40° C., according to ASTM D256.

12 . A copolycarbonate composition, comprising a blend of a polycarbonate-polydimethylsiloxane (PC—Si) copolymer and a terephthalate polymer of Formula (IV):

wherein R 10 is a divalent aliphatic or cycloaliphatic radical containing from about 1 to about 10 carbon atoms;

wherein the composition has a melt volume rate of at least 8 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 11.5 ft-lb/inch at minus 40° C., according to ASTM D256; and

wherein the composition is produced by blending a mixture of the PC—Si copolymer, the terephthalate polymer, and from about 40 ppm to about 60 ppm of phosphoric acid.

13 . The composition of claim 12 , wherein the terephthalate polymer comprises from about 5 to about 20 weight percent of the copolycarbonate composition.

14 . The composition of claim 12 , wherein the composition has a melt volume rate of at least 12 cc/10 min at 300° C./1.2 kg, according to ASTM D1238.

15 . The composition of claim 12 , wherein the composition has a notched Izod impact strength of at least 12 ft-lb/in at minus 40° C., according to ASTM D256

16 . The composition of claim 12 , wherein the composition has a melt volume rate of at least 12 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 12 ft-lb/in at minus 40° C., according to ASTM D256.

17 . The composition of claim 12 , wherein the PC—Si copolymer is of the general Formula (III):

wherein A is selected from a bond, —O—, —S—, —SO 2 —, C 1 -C 12 alkyl, C 6 -C 20 aromatic, and C 6 -C 20 cycloaliphatic; each R 5 is independently selected from divalent C 2 -C 8 aliphatic; each M is independently selected from halogen, cyano, nitro, C 1 -C 8 alkylthio, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, C 2 -C 8 alkenyl, C 2 -C 8 alkenyloxy, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkoxy, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 7 -C 12 arylalkyl, C 7 -C 12 arylalkoxy, C 7 -C 12 alkylaryl, or C 7 -C 12 alkylaryloxy; each n is independently an integer from 0 to 4; x is the mole percentage of the carbonate unit; y has an average value of from about 2 to about 1,000; and z is the mole percentage of the siloxane unit.

18 . The composition of claim 17 , wherein the ratio of x:z is from about 20 to about 500.

19 . The composition of claim 17 , wherein A is isopropylidene.

20 . The composition of claim 12 , wherein the terephthalate polymer has a weight average molecular weight of from about 50,000 to about 110,000.

21 . A copolycarbonate composition comprising a blend of a polycarbonate-polydimethylsiloxane (PC—Si) copolymer and a terephthalate polymer;

wherein the PC—Si copolymer is of the general Formula (III):

wherein A is isopropylidene; each R 5 is independently selected from divalent C 2 -C 8 aliphatic; each M is independently selected from halogen, cyano, nitro, C 1 -C 8 alkylthio, C 1 -C 8 alkyl, C 1 -C 8 alkoxy, C 2 -C 8 alkenyl, C 2 -C 8 alkenyloxy, C 3 -C 8 cycloalkyl, C 3 -C 8 cycloalkoxy, C 6 -C 10 aryl, C 6 -C 10 aryloxy, C 7 -C 12 arylalkyl, C 7 -C 12 arylalkoxy, C 7 -C 12 alkylaryl, or C 7 -C 12 alkylaryloxy; each n is independently an integer from 0 to 4; x is the mole percentage of the carbonate unit; y has an average value of from about 2 to about 1,000; and z is the mole percentage of the siloxane unit;

wherein the terephthalate polymer is of the general Formula (IV):

wherein R 10 is a divalent aliphatic or cycloaliphatic radical containing from about 1 to about 10 carbon atoms;

wherein the terephthalate polymer comprises from about 5 to about 20 weight percent of the copolycarbonate composition; and

wherein the composition has a melt volume rate of at least 8 cc/10 min at 300° C./1.2 kg, according to ASTM D1238, and a notched Izod impact strength of at least 11.5 ft-lb/inch at minus 40° C., according to ASTM D256.