Stabilized polycarbonate compositions

Claim 2

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units selected from the group consisting of (1) units of the formula ##EQU2## wherein R is a monovalent hydrocarbon radical free of aliphatic unsaturation, a is from 1.00 to 2.10, b is from 0.1 to 1.0, and the sum of a plus b is from 2.00 to 2.67; (2) units of the formula ##STR12## wherein A and B are terminal units independently selected from ##STR13## and n is an integer of from about 1 to about 500, and (3) units of the formula ##STR14## wherein m is equal to about 26.

Claim 3

A composition as defined in claim 1 wherein component (b) is present in an amount of from about 0.001 to about 10.0 parts by weight per hundred parts by weight of aromatic carbonate polymer (a).

Claim 4

A composition as defined in claim 1 wherein the aromatic carbonate polymer component (a) is derived from bisphenol-A.

Claim 5

A composition as defined in claim 1 wherein the aromatic carbonate polymer component (a) is a copolymer derived from bisphenol-A and tetrabromo bisphenol-A.

Claim 6

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##EQU3## wherein R is a monovalent hydrocarbon radical free of aliphatic unsaturation, a is from 1.00 to 2.10, b is from 0.1 to 1.0, and the sum of a plus b is from about 2.00 to 2.67.

Claim 7

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##EQU3## wherein R is a monovalent hydrocarbon radical free of aliphatic unsaturation, a is from 1.00 to 2.10, b is from 0.1 to 1.0, and the sum of a plus b is from about 2.00 to 2.67.

Claim 8

A composition as defined in claim 5 wherein R is methyl.

Claim 9

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR15## wherein A and B are terminal units independently selected from ##STR16## and n is an integer of from about 1 to about 500.

Claim 10

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR15## wherein A and B are terminal units independently selected from ##STR16## and n is an integer of from about 1 to about 500.

Claim 11

A composition as defined in claim 7 wherein the terminal units in component (b) comprise mixed trimethylsiloxy and dimethylhydrogensiloxy units.

Claim 12

A composition as defined in claim 8 wherein said component (b) comprises about 1.6 percent by weight of active, silicon-bonded hydrogen.

Claim 13

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR17## wherein m is equal to about 26.

Claim 14

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR17## wherein m is equal to about 26.

Claim 15

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR18## wherein p is about 103 and n is about 22.

Claim 16

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR18## wherein p is about 103 and n is about 22.

Claim 17

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR19## wherein s is about 17.5 and t is about 3.2.

Claim 18

A thermal and oxidatively stabilized thermoplastic composition consisting essentially of in admixture (a) a high molecular weight aromatic carbonate polymer and a minor amount of (b) a chain-stopped polyorganohydrogen-siloxane comprising units of the formula: ##STR19## wherein s is about 17.5 and t is about 3.2.

Claim 19

A composition as defined in claim 1 which further includes a pigment.

Claim 20

A composition as defined in claim 13 wherein said pigment is titanium dioxide.

Claim 21

A composition as defined in claim 1 which further includes a stabilizing amount of (c) an organophosphite or organophosphonite of the formulae: ##STR20## wherein R 1 , R 2 and R 3 are independently selected from hydrogen, alkyl, aryl, cycloalkyl, aralkyl and alkylaryl radicals wherein at least one such R is other than hydrogen.

Claim 22

A composition as defined in claim 15 wherein the amount of stabilizer (c) comprises from about 0.005 to about 1.0 parts by weight based on 100 parts by weight of aromatic carbonate polymer (a).

Claim 23

A composition as defined in claim 15 wherein the stabilizer (c) comprises tri(nonylphenyl) phosphite.

Claim 24

A composition as defined in claim 15 wherein the stabilizer (c) comprises diphenyldecyl phosphite.

Claim 25

A composition as defined in claim 1 which further includes a stabilizing amount of a compound of the formulae: ##STR21## wherein R 1 is, independently, alkyl, aryl, cycloalkyl, aralkyl or alkaryl.

Claim 26

A composition as defined in claim 1 which further includes a stabilizing amount of (d) an epoxy compound selected from the following: I. Derivatives of epoxy ethane represented by the following formula: ##STR22## wherein R 5 , R 6 , R 7 and R 8 are independently hydrogen, alkyl of 1-24 carbon atoms, aryl of 6-24 carbon atoms, --CH 2 OR', --CH 2 OCOR', --CH 2 OCOR'X, --'COOCH 2 X, or --CH 2 OR"OCH 2 X, wherein R' is alkyl of 1-24 carbon atoms or aryl of 6 to 24 carbon atoms and wherein R" is alkylene of 1-24 carbon atoms and X is an oxirane ring. II. Derivatives of epoxy cyclohexane represented by the following formula: ##STR23## wherein R 9 through R 16 are independently selected from hydrogen, alkyl of 1-24 carbon atoms, --COOR 17 , --OCOR 17 , --COOR 18 X, or --OCOR 18 --COOX wherein R 17 is alkyl of 1-24 carbon atoms and R 18 is alkylene of 1-24 carbon atoms and X is an oxirane ring.

Claim 27

A composition as defined in claim 18 which further includes a stabilizing amount of an organophosphite or organophosphonite of the formulae: ##STR24## wherein R 1 , R 2 and R 3 are independently selected from hydrogen, alkyl, aryl, cycloalkyl, aralkyl and alkylaryl radicals wherein at least one such R is other than hydrogen.

Claim 28

A composition as defined in claim 15 wherein the stabilizer (c) comprises diphenyloctyl phosphite in combination with 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate.

Claim 29

A composition as defined in claim 15 which further includes a pigment.

Claim 30

A composition as defined in claim 23 wherein said pigment is titanium dioxide.

Claim 33

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane is added in an amount from about 0.001 to about 10.0 parts by weight per one hundred parts by weight of aromatic carbonate polymer.

Claim 34

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane comprises units of the formula: ##EQU5## wherein R is a monovalent hydrocarbon radical free of aliphatic unsaturation, a is from 1.00 to 2.10, b is from 0.1 to 1.0, and the sum of a plus b is from about 2.00 to 2.67.

Claim 35

A method according to claim 25 wherein R is methyl.

Claim 36

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane is of the formula: ##STR28## wherein A and B are terminal units independently selected from ##STR29## and n is an integer of from about 1 to about 500.

Claim 37

A method according to claim 29 wherein the terminal units in the chain-stopped polyorganohydrogen-siloxane comprises mixed trimethylsiloxy and dimethylhydrogen-siloxy units.

Claim 38

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane is of the formula: ##STR30## wherein m is equal to about 26.

Claim 39

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane is of the formula: ##STR31## wherein p is about 103 and n is about 22.

Claim 40

A method according to claim 25 wherein the chain-stopped polyorganohydrogen-siloxane is of the formula: ##STR32## wherein s is about 17.5 and t is about 3.2.