Abstract Production of synthetic vinyl resins having pronounced resistance to color deterioration, while also manifesting high impact strength and transparency, utilizing a butadiene graft polymer formed by the sequential addition to a polymer or copolymer of butadiene of from 80 to 30 parts of monomers for each 100 parts of total resin content, said monomers consisting of from 5 to 80 percent vinyl aromatic compound, from 5 to 50 percent of methyl methacrylate, and from 5 to 60 percent of acrylonitrile, the process being characterized in that at least 80 percent of the butadiene particles at the start are less than 0.1 Mu in diameter and are dispersed in an aqueous emulsion which contains from 0.5 to 10.0 parts of a formaldehyde sulfoxylic salt, and catalytically effective amounts up to three parts of peroxide, for each 100 parts of resinous constituents used, said particle size being maintained at least until polymerization of the monomeric material has been effectively begun, said butadiene graft polymer being independently useful but also being capable of blending with a resin of the vinyl chloride type to produce a final resin of greatly enhanced properties.
The process of claim 1 wherein at least a portion of the acrylonitrile is incorporated in the dispersion containing the polybutadiene particles, the sulfoxylate and the peroxide prior to the addition of the methyl methacrylate and monoethylenically unsaturated aromatic hydrocarbon.
Claim 2
Dependent Claim
21 words
The process of claim 1 wherein the acrylonitrile, methyl methacrylate and monoethylenically unsaturated aromatic hydrocarbon are added sequentially and in increments.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the monoethylenically unsaturated aromatic hydrocarbon is styrene.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the rubbery butadiene polymer is a copolymer of butadiene and styrene.
Claim 5
Dependent Claim
41 words
The process of claim 1 wherein the amount of formaldehyde sulfoxylic salt employed is from about two parts to about five parts in relation to each 100 parts of the total weight of the monomeric and polymeric constituents to be used.
Claim 6
Dependent Claim
59 words
The process of making a thermoplastic composition whereby the final resin not only possesses high transparency and resistance to impact, but also possesses an enhanced capacity to resist color deterioration at elevated temperatures under subsequent manufacturing, by blending a vinyl chloride polymer containing at least 70 percent polyvinyl chloride with a graft polymer made in accordance with claim 1.
Claim 7
Dependent Claim
59 words
The process of making a thermoplastic composition whereby the final resin not only possesses high transparency and resistance to impact, but also possesses an enhanced cApacity to resist color deterioration at elevated temperatures under subsequent manufacturing, by blending a vinyl chloride polymer containing at least 70 percent polyvinyl chloride with a graft polymer made in accordance with claim 5.
Claim 8
Dependent Claim
10 words
The graft polymer produced by the method of claim 1.
Claim 9
Dependent Claim
10 words
The thermoplastic composition produced by the method of claim 7.