Abstract There is disclosed a process for the preparation of graft copolymers of a vinyl halide and a long-chain aliphatic vinyl monomer. In accordance with the process, an aqueous dispersion is formed of a preformed rubber-modified vinyl halide graft copolymer, a vinyl halide monomer and a long-chain aliphatic monomer capable of copolymerizing with the vinyl halide monomer. Copolymerization of said monomers is the presence of the aqueous dispersion of the preformed graft polymer leads to a polymeric particle whose shell contains a major proportion of the polymeric long-chain aliphatic monomer and whose core is essentially devoid of this monomer. This preferential concentration of a lubricating monomer on the outer shell of the product particle leads to greatly improved toughness under conditions of high shear.
The process of claim 1 wherein said vinyl halide polymer particles comprise a graft copolymer of vinyl chloride on chlorinated polyethylene.
Claim 2
Dependent Claim
33 words
The process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: CH2 CH-O-R where R is an aliphatic radical containing from about eight to 22 carbon atoms.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: where R is an aliphatic radical containing from about eight to 22 carbon atoms.
Claim 4
Dependent Claim
37 words
The process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: where R is an aliphatic radical containing from about 8 to 22 carbon atoms and R1 is hydrogen or methyl.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein said long-chain aliphatic vinyl monomer is cetyl vinyl ether.
Claim 6
Dependent Claim
37 words
The product produced by the process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: CH2 CH-O-R where R is an aliphatic radical containing from about eight to 22 carbon atoms.
Claim 7
Dependent Claim
35 words
The product produced by the process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: where R is an aliphatic radical containing from about eight to 22 carbon atoms.
Claim 8
Dependent Claim
41 words
The product produced by the process of claim 1 wherein said long-chain aliphatic vinyl monomer is characterized by the general formula: where R is an aliphatic radical containing from about eight to 22 carbon atoms and R1 is hydrogen or methyl.
Claim 9
Dependent Claim
19 words
The product produced by the process of claim 1 wherein said long-chain aliphatic vinyl monomer is cetyl vinyl ether.