Ultraviolet light stabilizer combination for polymers

Claim 2

A composition which comprises a mixture of a. zinc oxide, b. at least one zinc dihydrocarbyldithiocarbamate represented by the formula ##STR4## wherein each R 1 group is independently selected from the group consisting of an acyclic hydrocarbon radical having from 1 to 20 carbon atoms and cyclic hydrocarbon radicals having 5 to 20 carbon atoms, and c. nickel phosphonate represented by the formula ##STR5## wherein R 2 is an alkyl radical having from 1 to 6 carbon atoms, R 3 is selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms, R 4 is an alkylene radical having from 1 to 4 carbon atoms and R 5 is selected from the group consisting of hydrogen and alkyl having from 1 to 30 carbon atoms, wherein the weight ratio of said zinc oxide to said compound (b) is in the approximate range of 10:1 to 1:3.2 and the weight ratio of said zinc oxide to said compound (c) is in the approximate range of 10:1 to 1:2.

Claim 3

The composition of claim 1 additionally comprising at least one hindered phenol antioxidant, the weight ratio of said zinc oxide to said antioxidant being in the approximate range of 500:1 to 1:2.

Claim 4

The composition of claim 2 wherein the weight ratio of said zinc oxide to said antioxidant is in the approximate range of 80:1 to 2.5:1.

Claim 5

The composition of claim 1 wherein said component (b) is zinc dibutyldithiocarbamate, and said component (c) is nickel bis(O-ethyl-3,5-di-t-butyl-4-hydroxybenzylphosphonate).

Claim 6

The composition of claim 2 wherein said component (b) is zinc dibutyldithiocarbamate, said component (c) is nickel bis(O-ethyl-3,5-di-t-butyl-4-hydroxybenzyl phosphonate), and said antioxidant is tetrakis[ methylene-(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane.

Claim 7

The composition of claim 2 wherein said component (b) is zinc dibutyldithiocarbamate, said component (c) is nickel bis(O-ethyl-3,5-di-t-butyl-4-hydroxybenzyl phosphonate), and said antioxidant is 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene.

Claim 8

A stabilized polymeric composition comprising a major amount of a polymer of a mono-1-olefin having incorporated therein a. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of zinc oxide; b. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of at least one zinc dihydrocarbyldithiocarbamate represented by the formula ##STR6## wherein each R 1 group is independently selected from the group consisting of acyclic hydrocarbon radicals having from 1 to 20 carbon atoms and cyclic hydrocarbon radicals having from 5 to 20 carbon atoms; and c. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of at least one nickel phosphonate represented by the formula ##STR7## wherein R 2 is an alkyl radical having from 1 to 6 carbon atoms, R 3 is selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms, R 4 is a divalent alkylene radical having from 1 to 4 carbon atoms and R 5 is selected from the group consisting of hydrogen and alkyl having from 1 to 30 carbon atoms, and wherein the weight ratio of said zinc oxide to said compound (b) is in the approximate range of 10:1 to 1:3.2 and the weight ratio of said zinc oxide to said compound (c) is in the approximate range of 10:1 to 1:2.

Claim 9

A stabilized polymeric composition comprising a major amount of a polymer of a mono-1-olefin having incorporated therein a. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of zinc oxide; b. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of at least one zinc dihydrocarbyldithiocarbamate represented by the formula ##STR6## wherein each R 1 group is independently selected from the group consisting of acyclic hydrocarbon radicals having from 1 to 20 carbon atoms and cyclic hydrocarbon radicals having from 5 to 20 carbon atoms; and c. a small but effective amount, sufficient to stabilize said composition against the deteriorative action of ultraviolet light, of at least one nickel phosphonate represented by the formula ##STR7## wherein R 2 is an alkyl radical having from 1 to 6 carbon atoms, R 3 is selected from the group consisting of hydrogen and alkyl having from 1 to 6 carbon atoms, R 4 is a divalent alkylene radical having from 1 to 4 carbon atoms and R 5 is selected from the group consisting of hydrogen and alkyl having from 1 to 30 carbon atoms, and wherein the weight ratio of said zinc oxide to said compound (b) is in the approximate range of 10:1 to 1:3.2 and the weight ratio of said zinc oxide to said compound (c) is in the approximate range of 10:1 to 1:2.

Claim 10

The composition of claim 7 additionally having incorporated therein a small but effective amount, sufficient to stabilize said composition against oxidative deteriorative action, of at least one hindered phenol antioxidant.

Claim 11

The composition of claim 8 wherein said component (a) is present in an approximate amount ranging from 0.25 to 10 php; said component (b) is present in an approximate amount ranging from 0.05 to 2 php; said component (c) is present in an approximate amount ranging from 0.05 to 1.5 php; and said antioxidant is present in an approximate amount ranging from 0.02 to 0.5 php.

Claim 12

The composition of claim 8 wherein said polymer is a polymer of propylene; said component (b) is zinc dibutyldithiocarbamate; said component (c) is nickel bis(0-ethyl-3,5-di-t-butyl-4hydroxybenzyl phosphonate); and said antioxidant is tetrakis[methylene-(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane.

Claim 13

The composition of claim 8 wherein said polymer is a polymer of propylene; said component (b) is zinc dibutyldithiocarbamate; said component (c) is nickel bis(O-ethyl-3,5-di-t-butyl-4-hydroxybenzyl phosphonate); and said antioxidant is 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene.

Claim 14

The composition of claim 8 wherein said component (a) is present in an approximate amount ranging from 0.5 to 4 php; said component (b) is present in an approximate amount ranging from 0.1 to 1.6 php; said component (c) is present in an approximate amount ranging from 0.08 to 1 php; and said antioxidant is present in an approximate amount ranging from 0.05 to 0.2 php.