Impact improvement of rubber-modified nitrile resins

Claim 2

An impact-resistant resin composition comprising an intimate mixture of from 1 to 30 parts by weight of an impact improver selected from the group consisting of triethyl phosphate, 2-ethyl hexanoic acid, 2,4-di-t-butyl phenol, trimethyl phosphate, tributyl phosphate, 4-hexyl resorcinol, epoxidized soybean oil, 2,6-di-t-butyl-4-methyl phenol, and p-nonyl phenol and 100 parts by weight of a resin resulting from the polymerization of a major proportion of an unsaturated nitrile in the presence of a preformed rubber component and optionally a minor proportion of at least one other polymerizable component.

Claim 3

The composition of claim 1 wherein the resin is one which results from the polymerization of 100 parts by weight of A. at least 50% by weight of at least one nitrile having the structure ##STR7## wherein R is hydrogen, a lower alkyl group having from 1 to 4 carbon atoms, or a halogen, and B. up to 50% by weight based on the combined weights of (A) and (B) of an ester having the structure ##STR8## wherein R 1 is hydrogen, an alkyl group having from 1 to 4 carbon atoms, or a halogen, and R 2 is an alkyl group having from 1 to 6 carbon atoms, in the presence of from 1 to 40 parts by weight of C. a rubbery polymer of a conjugated diene monomer selected from the group consisting of butadiene and isoprene and optionally a comonomer selected from the group consisting of styrene, a nitrile monomer having the structure ##STR9## wherein R has the foregoing designation, and a monomer having the structure ##STR10## wherein R 1 and R 2 have the foregoing respective designations, said rubbery polymer containing from 50 to 100% by weight of polymerized conjugated diene and from 0 to 50% of comonomer.

Claim 4

The composition of claim 12 wherein (A) is acrylonitrile.

Claim 5

The composition of claim 3 wherein the impact improver is triethyl phosphate.

Claim 6

The composition of claim 3 wherein the impact improver is 2-ethyl hexanoic acid.

Claim 7

The composition of claim 3 wherein the impact improver is 2,4-di-t-butyl phenol.

Claim 8

The composition of claim 3 wherein the impact improver is trimethyl phosphate.

Claim 9

The composition of claim 3 wherein the impact improver is tributyl phosphate.

Claim 10

The composition of claim 3 wherein the impact improver is 4-hexyl resorcinol.

Claim 11

The composition of claim 3 wherein the impact improver is epoxidized soybean oil.

Claim 12

The composition of claim 3 wherein the impact improver is 2,6-di-t-butyl-4-methyl phenol.

Claim 13

The composition of claim 3 wherein the impact improver is p-nonyl phenol.