METHACRYLIC RESIN COMPOSITION

摘要

It is an object of the present invention to provide a methacrylic resin composition that realizes both delamination resistance and hot water whitening resistance and that makes it possible to form a film excellent in terms of transparency, flex cracking (whitening) resistance, and appearance. The methacrylic resin composition includes an acrylic graft copolymer containing an acrylic acid ester-based rubbery polymer. In the methacrylic resin composition:
(1) a content of the acrylic acid ester-based rubbery polymer is 10 to 40 wt%; (2) a mean particle diameter d of the acrylic acid ester-based rubbery polymer is 50 to 200 nm; (3) a relationship between the mean particle diameter d (nm) of the acrylic acid ester-based rubbery polymer and a cross-linking agent content w (wt%) in a monomer mixture used in the acrylic acid ester-based rubbery polymer satisfies 0.02d ‰¤ w ‰¤ 0.05d; (4) a graft ratio of the acrylic graft copolymer is 60 to 105 %; and (5) a reduced viscosity of a component of the methacrylic resin composition, the component being soluble in methyl ethyl ketone, is 0.75 to 1.3 dl/g.