Patent ID: 8450420

Claim:
A polylactic acid-containing resin composition comprising: a polylactic acid in an amount in a range of 50 to 95 weight percent based on a total weight of the resin composition; and a (meth)acrylic copolymer having a weight average molecular weight in a range of 50,000 to 2,000,000 g/mole in an amount in a range of 5 to 50 weight percent based on a total weight of the resin composition, wherein said (meth)acrylic copolymer is a reaction product of methyl acrylate (i); and at least one (meth)acrylic acid ester (ii) represented by formulas (i), (II), or (III): CH 2 ═CH—COO—R 2 (I) CH 2 ═C(R 1 )—COO—(CH 2 CH 2 O) m —R 3 (II) CH 2 ═C(R 1 )—COO—(CH 2 CH 2 O) n -Ph (III) wherein R 1 is —H, or —CH 3 ; R 2 is a C 2 -C 14 alkyl; R 3 is —CH 3 , or —CH 2 CH 3 ; Ph is —C 6 H 5 ; and m and n are each independently an integer that is greater than or equal to 1; the monomer mixture is free of methyl methacrylate; the methyl acrylate (i) and the (meth)acrylic acid ester (ii) are blended at a weight ratio methyl acrylate (i): (meth)acrylic acid ester (ii) of 95:5 to 50:50 in the (meth)acrylic copolymer; and the (meth)acrylic copolymer has a glass transition temperature in the range of −2.5° C. to −36.5° C.