Abstract There is disclosed a process for the preparation of 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 vinyl halide polymer, a vinyl halide monomer and a long-chain aliphatic ether monomer capable of copolymerizing with the vinyl halide monomer. Copolymerization of said monomers in the presence of the aqueous dispersion of the preformed polymer leads to a polymeric particle whose shell contains a major proportion of the polymeric long-chain aliphatic ether monomer and whose core is essentially devoid of this monomer. This preferential concentration of a lubricating monomer on the outer shell of the particle leads to greatly improved flow with only a minor loss in glass temperature.
from about 20 to 60 parts by weight of a monomer mixture comprising (on a 100 weight percent total mixture basis): a. from about 70 to 98 weight percent vinyl halide monomer, and b. the balance up to 30 weight percent of any given such mixture being at least one long-chain aliphatic vinyl compound characterized by the general formula: where R2 is an aliphatic radical containing from 8 through 22 carbons, B. subjecting said aqueous dispersion to polymerization conditions for a period of time sufficient to polymerize at least a substantial portion of the polymerizable monomers present therein, and C. recovering the resulting polymeric product.
Claim 2
Dependent Claim
14 words
The process of claim 1 wherein said vinyl halide polymer particles comprise homopolyvinyl chloride.
Claim 3
Dependent Claim
63 words
comprising a first polymer whose composition comprises: a. at least about 75 weight percent of a polymerized vinyl halide, and b. the balance up to 25 weight per cent of any given such first polymer being at least one copolymerized ethylenically unsaturated aliphatic monomer having a molecular weight under about 100, B. said shell portion being substantially a second polymer whose composition comprises:
Claim 4
Dependent Claim
70 words
the balance up to 98 weight percent of any given such second polymer being a copolymerized vinyl halide, C. the weight ratio of said shell portion to said core portion ranging from about 0.20:1 to 1.50:1, D. said long-chain aliphatic vinyl compound being characterized by having at least one long-chain aliphatic vinyl compound characterized by the general formula: where R1 is an aliphatic radical containing from eight through 22 carbons.
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
28 words
A vinyl halide polymer initially in the form of discrete particles, each such particle having a core portion and a shell portion integral therewith, A. said core portion:
Claim 7
Dependent Claim
15 words
The polymer of claim 4 wherein said long-chain aliphatic vinyl monomer is cetyl vinyl ether.
Claim 8
Dependent Claim
12 words
The polymer of claim 4 wherein said first polymer comprises homopolyvinyl chloride.