ACRYLIC MULTILAYER STRUCTURE COPOLYMER, METHACYLIC RESIN COMPOSITION THEREWITH AND LUMP LENS

PROBLEM TO BE SOLVED: To keep haze and temperature-dependency of color tone appearances low and to improve flowability by polymerizing an alkyl methacrylate in the presence of a certain innermost polymer and an intermediate layer polymer. SOLUTION: 100 pts.wt.% monomer mixture comprising (a) 40-100 wt.% of a 1-4C alkyl, methacrylate, (b) 0-60 wt.% of a 1-8C alkyl acrylate and (c) 0-20 wt.% of another copolymerizable monomer; (d) 0.1-5 pts.wt. crossliker; and (e) 0.1-5 pts.wt. graft-crossing agent are pclymerized to obtain an innermost polymer (A). 100 pts.wt. monomer mixture comprising 70-90 wt.% of the component (b), 10-30 wt.% of an aromatic vinyl monomer and 0-20 wt.% of the component (c); 0.1-5 pts.wt. of the component (d); and 0.1-5 pts.wt. of the component (e) are polymerized in the presence of the component (A) to obtain an intermediate layer polymer (B). 50-100 wt.% of the component (a), 0-50 wt.% of the component (b) and 0-20 wt.% of the component (c) are polymerized in the presence of the components (A) and (B) to form an outermost polymer (C), thereby obtaining an acrylic multilayer structure copolymer.