Method for producing methyl methacrylate polymer
AssigneeKaneka Corporation
InventorFuminobu Kitayama
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Abstract
Provided herein is a (meth)acrylic resin that has less impurities and is less likely to deteriorate in transparency or turn yellow during molding processing, which is not obtainable by conventional suspension polymerization. The invention is a method for producing a methyl methacrylate polymer, comprising suspension polymerization of 30 to 100 wt % of methyl methacrylate and 70 to 0 wt % of a monomer copolymerizable therewith to produce a methyl methacrylate polymer, wherein the polymerization is initiated in the presence of 350 ppm or less of a suspension stabilizer relative to the monomer(s) and then a suspension stabilizer is added when a polymerization conversion ratio reaches 20 to 90%.
Claims8
A method for producing a methyl methacrylate polymer, comprising suspension polymerization of 30 to 100 wt % of methyl methacrylate and 70 to 0 wt % of a monomer copolymerizable therewith to produce a methyl methacrylate polymer, wherein the polymerization is initiated in the presence of 350 ppm or less of an initial suspension stabilizer relative to the monomer(s), and then a later suspension stabilizer is added when a polymerization conversion ratio reaches 20 to 90%.
A methyl methacrylate polymer whose nonionic water-soluble polymer content is 500 ppm or less.
Dependencies are inferred from the claim text.