Cyclic phosphonite stabilized cellulose ester compositions

Claim 2

A cellulose ester plastic composition containing a thermally stabilizing amount of the combination of (A) about 0.10 to 1 part by weight of at least one cyclic phosphonite compound having the formula ##STR3## wherein X is hydrogen, hydroxyl, amino, alkyl having 1 to 22 carbon atoms, alkoxy having 1 to 22 carbon atoms, alkylthio, aryloxy or arylthio having 1 to 22 carbon atoms; Y 1 is alkyl having 1 to 18 carbon atoms; Y 2 is halogen, alkyl having 1 to 18 carbon atoms, alkoxy having 1 to 18 carbon atoms, nitro, cyano or sulfonic acid radical; Y 1 and Y 2 combined with a biphenyl ring form a phenanthrene ring; Z is an oxygen or sulfur atom; m and n are whole numbers ranging from 0 to 4; (B) a conventional antioxidant; and (C) an acid accepting epoxy compound.

Claim 3

A cellulose ester plastic composition according to claim 1 wherein said acid accepting epoxy compound is a member of the group consisting of compounds having the formula ##STR4## where n = 0 to 12; (B) neopentyl glycol diglycidyl ethor; ##STR5## wherein R 1 is an alkylene having 1 to 12 carbon atoms, or arylene which can be substituted with alkyl or hydroxy; x and y is 1 to 10; R 2 is methyl, ethyl, propyl, butyl, hexyl or octyl; (D) epoxidized tallate; and (E) epoxidized soybean oil.

Claim 4

A cellulose ester plastic composition according to claim 2 wherein said conventional antioxidant is a member of the group consisting of (A) organic phosphite antioxidants, (B) thiodipropionate acid ester antioxidants, and (C) phenolic antioxidants which contain one or more phenolic nuclei.

Claim 5

A cellulose ester plastic composition containing a thermally stabilizing amount of the combination of (A) about 0.10 to 1 part by weight of at least one cyclic phosphonite compound having the formula ##STR6## wherein X is hydrogen, hydroxyl, amino, alkyl having 1 to 22 carbon atoms, alkoxy having 1 to 22 carbon atoms, alkylthio, aryloxy or arylthio having 1 to 22 carbon atoms; Y 1 is alkyl having 1 to 18 carbon atoms; Y 2 is halogen, alkyl having 1 to 18 carbon atoms, alkoxy having 1 to 18 carbon atoms, nitro, cyano or sulfonic acid radical; Y 1 and Y 2 combined with a biphenyl ring form a phenanthrene ring; Z is an oxygen or sulfur atom; m and n are whole numbers ranging from 0 to 4; (B) about 0.50 to 3 parts by weight of at least one member of the group consisting of compounds having the formula: ##STR7## where n =0 to 12; (2) neopentyl glycol diglycidyl ether; ##STR8## wherein R 1 is an alkylene having 1 to 12 carbon atoms, or arylene which can be substituted with alkyl or hydroxy; x and y is 1 to 10; R 2 is methyl, ethyl, propyl, butyl, hexyl or octyl; (4) epoxidized tallate; (5) epoxidized soybean oil; and (C) about 0.05 to 1 part by weight of at least one conventional antioxidant.

Claim 6

A cellulose ester plastic composition containing a thermally stabilizing amount of the combination of (A) about 0.10 to 1 part by weight of at least one cyclic phosphonite compound having the formula ##STR6## wherein X is hydrogen, hydroxyl, amino, alkyl having 1 to 22 carbon atoms, alkoxy having 1 to 22 carbon atoms, alkylthio, aryloxy or arylthio having 1 to 22 carbon atoms; Y 1 is alkyl having 1 to 18 carbon atoms; Y 2 is halogen, alkyl having 1 to 18 carbon atoms, alkoxy having 1 to 18 carbon atoms, nitro, cyano or sulfonic acid radical; Y 1 and Y 2 combined with a biphenyl ring form a phenanthrene ring; Z is an oxygen or sulfur atom; m and n are whole numbers ranging from 0 to 4; (B) about 0.50 to 3 parts by weight of at least one member of the group consisting of compounds having the formula: ##STR7## where n =0 to 12; (2) neopentyl glycol diglycidyl ether; ##STR8## wherein R 1 is an alkylene having 1 to 12 carbon atoms, or arylene which can be substituted with alkyl or hydroxy; x and y is 1 to 10; R 2 is methyl, ethyl, propyl, butyl, hexyl or octyl; (4) epoxidized tallate; (5) epoxidized soybean oil; and (C) about 0.05 to 1 part by weight of at least one conventional antioxidant.

Claim 7

A cellulose ester plastic composition according to claim 4 wherein said cyclic phosphonite is 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. 10-phosphaphenanthrene10-oxide.

Claim 8

A cellulose ester plastic composition according to claim 5 wherein said conventional antioxidant is tetrakis[ methylene(3,5-di-tertbutyl-4-hydroxyhydrocinnanmate)methane].

Claim 9

A cellulose ester plastic composition according to claim 6 wherein said acid accepting epoxy compound is an epichlorohydrin/bisphenol A type epoxy resin.

Claim 10

A cellulose ester plastic composition according to claim 7 wherein said epichlorohydrin/bisphenol A type epoxy resin is present in an amount of 0.5 to 1.5 parts by weight per 100 parts of cellulose ester.