Methyl methacrylate-butadiene-styrene impact modifier polymers, polyvinyl chloride, compositions and methods
AssigneeRohm and Haas Company
InventorsRichard R. Clikeman, Donald H. Jones, Thomas J. Shortridge, Edward J. Troy
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Abstract
Methyl methacrylate-butadiene-styrene polymer impact modifiers are improved by mixing them with about 0.01 to 5 percent by weight of a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are C.sub.1 to C.sub.4 alkyl, R.sub.3 and R.sub.4 are H, C.sub.1 to C.sub.4 alkyl, or 4'-hydroxy-2'-R.sub.2 -5'-R.sub.1 -phenyl. Polyvinyl chloride (PVC) is mixed with the improved impact modifiers and has improved dispersion and resistance to discoloration.
Claims7
Impact modifier composition comprising a methyl methacrylate-butadiene-styrene polymer prepared in two or more stages and containing about 50 to 90 parts polybutadiene or compolymer of polybutadiene and about 0.01 to 5 percent by weight of 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butyl phenyl) butane.
Method of stabilizing methyl methacrylate-butadiene-styrene polymer impact modifiers containing about 50 to 90 parts polybutadiene or copolymer of polybutadiene against oxidative degradation and discoloration, and improving the dispersibility of said modifiers in polyvinyl chloride comprising blending an emulsion containing 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butyl phenyl) butane with an emulsion of the polymer impact modifier, and isolating the resultant blend.
Dependencies are inferred from the claim text.