Coagulation of polymers using sulfurous acid
AssigneeGeneral Electric Company
InventorJohn C. Wozny
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Abstract
Methods for coagulating a graft polymer latex comprise contacting the latex with sulfurous acid. The methods are particularly suitable for ABS resins and provide products having improved thermal oxidative stability and color stability. When coagulation is effected in the presence of a radical initiator, the residual grafting monomer concentration in the resin product is reduced.
Claims9
A method for coagulating a graft polymer latex, said graft polymer latex having been formed by emulsion polymerization of one or more monomers, said one or more monomers comprising at least one monovinyl aromatic monomer, in the presence of a rubber substrate, comprising contacting the graft polymer latex with sulfurous acid.
A method for coagulating a graft polymer latex, said graft polymer latex having been formed by emulsion polymerization of styrene and acrylonitrile in the presence of a polybutadiene substrate, comprising contacting the graft polymer latex with sulfurous acid.
Dependencies are inferred from the claim text.