Stabilized polycarbonate composition

Claim 2

A stabilized polycarbonate composition comprising in admixture, an aromatic carbonate polymer and a stabilizing amount of a cyclic diphosphite characterized by the following general formula: ##STR6## wherein X is selected from the group consisting of lower alkyl of 1 to 6 carbon atoms; aryl, alkaryl and aralkyl of 6 to 20 carbon atoms and halogen.

Claim 3

The composition as defined in claim 1 wherein the cyclic diphosphite is used in amounts of from 0.01 to about 0.10 weight percent.

Claim 4

The composition as defined in claim 1 wherein the cyclic diphosphite is di-(2,4-di-t-butylphenyl) pentaerythrityl diphosphite.

Claim 5

The composition as defined in claim 1 which contains a stabilizing amount of a silane compound of the general formula: R.sub.a Si(OR).sub.b wherein R is independently selected from the group consisting of alkyl, alkoxy, aryl, aralkyl and alkaryl of 1 to 20 carbon atoms and wherein a + b = 4 and b is an integer equal to or less than 3.

Claim 6

The composition as defined in claim 4 wherein the silane is used in amounts of from 0.01 to about 0.10 weight percent based on the weight of the polycarbonate composition.

Claim 7

The composition as defined in claim 4 wherein the silane is triethoxy silane.

Claim 8

The composition as defined in claim 4 wherein the silane is diphenyl diethoxy silane.

Claim 9

The composition as defined in claim 1 which contains 0.01 to 0.5 weight percent based on the weight of the polymer composition of epoxy compounds selected from the following: I. derivatives of epoxy ethane represented by the following formula: ##STR7## wherein R 1 , R 2 , R 3 and R 4 are independently selected from the group consisting of hydrogen, an alkyl radical of 1-24 carbon atoms, an aryl radical of 6-24 carbon atoms, --CH 2 OR', --CH 2 OCOR', --CH 2 OCOR'X, 'COOCH 2 X, CH 2 OR"OCH 2 X wherein R' is selected from the group consisting of an alkyl radical of 1-24 carbon atoms or an aryl radical of 6 to 24 carbon atoms and wherein R" is an alkylene radical of 1-24 carbon atoms and X is an oxirane ring. Ii. derivatives of epoxy cyclohexane represented by the following formula: ##STR8## wherein R 5 through R 12 are independently selected from the group consisting of hydrogen, alkyl radicals of 1-24 carbon atoms, --COOR 13 , --OCOR 13 , --COOR 14 X, --OCOR 14 --COOX wherein R 13 is an alkyl radical of 1-24 carbon atoms and R 14 therein is an alkylene radical of 1-24 carbon atoms and X is an oxirane ring.

Claim 10

The composition as defined in claim 8 wherein the epoxy compound is 2,3-epoxycyclohexylmethyl 3,4-epoxycyclohexane carboxylate.