Patent ID: 7910659

Claim:
An acrylic syrup having a viscosity at 25° C. of from 0.1 to 50 Pa·s and containing: a vinyl monomer (A) which comprises not less than 85% by weight of methyl methacrylate and not more than 15% by weight of a vinyl compound selected from the group consisting of acrylonitrile, methacrylonitrile, styrene, alpha-methylstyrene, dimethylstyrene, vinyltoluene, chlorostyrene, acrylic acid, methacrylic acid, maleic acid, fumaric acid and vinyl acetate, and a polymerized solid component (B) which is a high polymer of said vinyl monomer and has a weight average molecular weight of from 30,000 to 2,000,000 as measured by the GPC, wherein at least part of said polymerized solid component (B) is: (i) a grafted rubber obtained by graft-polymerizing said vinyl monomer with a rubbery polymer, by employing a half-batch polymerization method, wherein the rubbery polymer consists of a non-hydrogenated styrene/butadiene copolymer that is added at a ratio of 2 to 20 parts by weight per 100 parts by weight of a total amount of said vinyl monomer (A), (ii) said high polymer of said vinyl monomer except the grafted rubber and (iii) said vinyl monomer which is graft-polymerized with the rubbery polymer; and wherein said grafted rubber has a branching coefficient with which the slope obtained by double logarithmically plotting the RMS radius (z-average inertial radius) calculated from the GPC-MALLS (gel permeation chromatography-multi-angle laser light scattering) measurement and the molecular weight, is 0.35 to 0.65 (nm/(g/mol)).