Stabilization of radial block copolymers

Claim 2

A composition according to claim 2 wherein said copolymer contains from 70-60 weight per cent, based on weight of copolymer, of butadiene and from 30-40 weight per cent, based on weight of copolymer, of styrene and said stabilizing additive is selected from the group consisting of zinc dibutyldithiocarbamate or 2(2-hydroxy-5-methylphenyl)benzotriazole.

Claim 3

A stabilized polymeric composition comprising a radial block copolymer of a conjugated diene and a vinyl-substituted aromatic compound wherein, based on the weight of said copolymer, said conjugated diene is in the range of about 70-50 weight per cent and is a material selected from the group consisting of butadiene, isoprene, 2,3-methyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 1-phenyl-1,3-butadiene and mixtures thereof and said vinyl-substituted aromatic compound is in the range of about 30-50 weight per cent and is a material selected from the group consisting of styrene, 3-methylstyrene, 4-n-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4-(4-phenyl-n-butyl)styrene, and mixtures thereof; and a stabilizing amount of a stabilizing additive mixture consisting essentially of at least one benzotriazole compound having the formula

Claim 4

A polymeric composition according to claim 4 wherein the amount of benzotriazole compound is in the range of about 0.1-0.5 parts by weight per 100 parts by weight of copolymer, the amount of organic phosphite compound is in the range of about 0.5-1.5 parts by weight per 100 parts by weight of copolymer, and the amount of zinc alkyldithiocarbamate is in the range of 0.1-0.5 parts by weight per 100 parts by weight of copolymer.

Claim 5

A polymeric composition according to claim 5 wherein said copolymer consists essentially of from 70-60 weight per cent, based on total weight of copolymer, of butadiene and from about 30-40 weight per cent, based on total weight of said copolymer, of styrene; and wherein said stabilizer additive mixture consists essentially of 2(2-hydroxy-5-methylphenyl)benzotriazole in combination with at least one compound selected from the group consisting of tri(nonylphenyl)phosphite, zinc dibutyldithiocarbamate and mixtures thereof.

Claim 6

A stabilized polymeric composition comprising a radial block cOpolymer of a conjugated diene and a vinyl-substituted aromatic compound wherein, based on the weight of said copolymer, said conjugated diene is in the range of about 70-50 weight per cent and is a material selected from the group consisting of butadiene, isoprene, 2,3-methyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 1-phenyl-1,3-butadiene, and mixtures thereof and said vinyl-substituted aromatic compound is in the range of from about 30-50 weight per cent and is a material selected from the group consisting of styrene, 3-methylstyrene, 4-n-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4-(4-phenyl-n-butyl)styrene and mixtures thereof; and a stabilizing amount of a mixture of the following stabilizer additive components: at least one organic phosphite having the general formula (RO)3P where R is any combination of an alkyl, aryl, cycloalkyl, aralkyl or alkaryl radical having one-24 carbon atoms and P is phosphorous; at least one zinc alkyldithiocarbamate having the formula wherein R1 and R2 are selected from the group consisting of alkyl and cycloalkyl radicals having one-23 carbon atoms; and carbon black.

Claim 7

A composition of matter according to claim 7 wherein said organic phosphite is present in an amount in the range of about 0.5-1.5 parts by weight per 100 parts by weight of copolymer; said zinc alkyldithiocarbamate is present in an amount in the range of about 0.5-1 parts by weight per 100 parts of copolymer and said carbon black is present in an amount in the range of 0.1-1.0 parts by weight per 100 parts by weight of copolymer.

Claim 8

A polymeric composition of claim 8 wherein said copolymer consists essentially of from 60-70 weight percent butadiene and from 30-40 weight percent styrene; said organic phosphite is tri(nonylphenyl)phosphite and said zinc alkyldithiocarbamate is zinc dibutyldithiocarbamate.

Claim 9

A stabilized polymeric composition comprising a radial block copolymer of a conjugated diene and a vinyl-substituted aromatic compound wherein, based on the weight of said polymer, said conjugated diene is in the range of about 70-50 weight percent and is a material selected from the group consisting of butadiene, isoprene, 2,3-methyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 1-phenyl-1,3-butadiene and mixtures thereof and said vinyl-substituted aromatic compound is in the range of about 30-50 weight percent and is a material selected from the group consisting of styrene, 3-methylstyrene, 4-n-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4-(4-phenyl-n-butyl)styrene and mixtures thereof; and a stabilizing amount of a combination of the following stabilizer components: at least one organic phosphite having the general formula (RO)3P wherein R is any combination of an alkyl, aryl, cycloalkyl, aralkyl and alkaryl radical having one-24 carbon atoms and P is phosphorus; at least one zinc alkyldithiocarbamate having the formula wherein R1 and R2 are selected from the class consisting of alkyl and cycloalkyl radicals having from one to 23 carbon atoms and mixtures thereof; and at least one benzotriazole compound having the formula

Claim 10

A stabilized polymeric composition according to claim 10 wherein said organic phosphite is present in an amount in the range of about 0.3-1.5 parts by weight per 100 parts by weight of copolymer; said zinc alkyldithiocarbamate is present in an amount in the range of about 0.1-0.7 parts by weight per 100 parts by weight of copolymer; and said benzotriazole is present in an amount in the range of about 0.2-1 parts by weight per 100 parts by weight of copolymer.

Claim 11

A composition according to claim 11 wherein said copolymer consists essentially of from about 70-60 weight percent of butadiene and from 30-40 weight percent of styrene; said organic phosphite comprises 0.5-1.4 parts by weight per 100 parts by weight of copolymer of tri(nonylphenyl) phosphite; said zinc dialkyldithiocarbamate comprises 0.3-0.7 parts by weight per 100 parts by weight of copolymer of zinc dibutyldithiocarbamate; and said benzotriazole comprises 0.5-1 parts by weight per 100 parts by weight of copolymer of 2(2-hydroxy-5-methylphenyl)benzotriazole.

Claim 12

A stabilized polymeric composition comprising a radial block copolymer of a conjugated diene and a vinyl-substituted aromatic compound wherein, based on the weight of said polymer, said conjugated diene is in the range of about 70-50 weight percent and is a material selected from the group consisting of butadiene, isoprene, 2,3-methyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 1-phenyl-1,3-butadiene and mixtures thereof and said vinyl-substituted aromatic compound is in the range of about 30-50 weight percent and is a material selected from the group consisting of styrene, 3-methyl styrene, 4-n-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4-(4-phenyl-n-butyl)styrene and mixtures thereof; and a stabilizing amount of the following stabilizer additive components: at least one organic phosphite having the general formula (RO)3P wherein R is any combination of alkyl, aryl, cycloalkyl, aralkyl or alkaryl radicals having one-24 carbon atoms and P is phosphorus; at least one zinc alkyldithiocarbamate having the formula wherein R1 and R2 are selected from the group consisting of alkyl or cycloalkyl radicals having one-23 carbon atoms; at least one benzotriazole compound having the formula

Claim 13

A composition of matter according to claim 13 wherein said organic phosphite is present in an amount in the range of about 0.5-1.5 parts by weight per 100 parts by weight of copolymer; said zinc alkyldithiocarbamate is present in an amount in the range of about 0.5-1 parts by weight per 100 parts by weight of copolymer; said benzotriazole compound is present in an amount in the range of about 0.1-1 parts by weight per 100 parts by weight of copolymer; and said carbon black is present in an amount in the range of about 0.1-1 parts by weight per 100 parts by weight of copolymer.

Claim 14

A polymeric composition according to claim 14 wherein said copolymer consists essentially of from about 70-60 weight percent butadiene and from about 30 to about 40 weight percent styrene; said organic phosphite comprises tri(nonylphenyl)phosphite; said zinc alkyldithiocarbamate comprises zinc dibutyldithiocarbamate; and said benzotriazole comprises 2(2-hydroxy-5-methylphenyl)benzotriazole.

Claim 15

A stabilized composition of matter comprising a radial block copolymer of a conjugated diene and a vinyl-substituted aromatic compound wherein, based on the weight of said polymer, said conjugated diene is in the range of abOut 70-50 weight percent and is a material selected from the group consisting of butadiene, isoprene, 2,3-methyl-1,3-butadiene, piperylene, 3-butyl-1,3-octadiene, 1-phenyl-1,3-butadiene and mixtures thereof and said vinyl-substituted aromatic compound is in the range of about 30-50 weight percent and is a material selected from the group consisting of styrene, 3-methylstyrene, 4-n-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4-p-tolylstyrene, 4-(4-phenyl-n-butyl)styrene and mixtures thereof; and a stabilizing amount of a mixture of the following stabilizer additive components: at least one organic phosphite having the general formula (RO)3P wherein R is any combination of an alkyl, aryl, cycloalkyl, aralkyl and alkaryl radical having from one to 24 carbon atoms and P is phosphorus; at least one zinc alkyldithiocarbamate having the formula wherein R1 and R2 are selected from the class consisting of alkyl and cycloalkyl radicals having from one-23 carbon atoms; at least one benzotriazole compound having the formula

Claim 16

A stabilized polymeric composition according to claim 16 wherein said organic phosphite is present in an amount in the range of about 0.5-1.5 parts by weight per 100 parts by weight of copolymer; said zinc alkyldithiocarbamate is present in an amount in the range of about 0.1-0.6 parts by weight per 100 parts by weight of copolymer; said benzotriazole compound is present in an amount in the range of about 0.1-0.6 parts by weight per 100 parts by weight of copolymer; and said thiodipropionic acid ester is present in an amount in the range of about 0.05-0.4 parts by weight per 100 parts by weight of copolymer.

Claim 17

A stabilized polymeric composition according to claim 17 wherein said copolymer consists essentially of from about 70-60 weight percent of butadiene and from about 30-40 weight percent styrene; said organic phosphite comprises tri(nonylphenyl)phosphite; said zinc alkyldithiocarbamate comprises zinc dibutyldithiocarbamate; said benzotriazole compound comprises 2(2-hydroxy-5-methylphenyl)benzotriazole; and said thiodipropionic acid ester comprises dilaurylthiodipropionate.