| 摘要 |
PROBLEM TO BE SOLVED: To produce a multilayer structure acrylic polymer (A) being excellent in impact resistance, transparency and discoloration resistance and having a small haze dependency by forming the innermost gayer and the intermediate layer by polymerization in the presence of a non-redox aqueous inorganic polymerization initiator and (a) forming the outermost layer by polymerization in the presence of a redox organic peroxide polymerization initiator (b). SOLUTION: Polymer A comprises 10-50 pts.wt. innermost layer polymer formed by polymerizing a monomer mixture based on a 1-4C alkyl methacrylate, 20-60 pts.wt. intermediate layer polymer formed by polymerizing a monomer mixture based on a graft-bondable monomer selected among 1-8C alkyl acrylates, aromatic vinyl monomers and/or arylalkyl acrylates,α,β-unsaturated carboxylic allyl esters, etc., and 20-60 pts.wt. outermost layer polymer formed by polymerizing a monomer mixture based on a 1-4C alkyl methacrylate. Component (a) is exemplified by a persulfate, and component (b) is exemplified by a hydroperoxide.
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