Polylactic acid composition

Details Polylactic acid composition Polylactic acid composition

C - Chemistry, Metallurgy

08

L

C08L 67/04 (2006.01) B32B 27/36 (2006.01) C08L 53/00 (2006.01) C09J 7/02 (2006.01) D01F 6/92 (2006.01) C08L 101/16 (2006.01)

Patent

CA 2628551

Disclosed is a polylactic acid composition composed of a polylactic acid resin (A) and an acrylic triblock copolymer (B), wherein (1) the acrylic triblock copolymer (B) is a triblock copolymer wherein a polymer block (B2a) and another polymer block (B2b) both having a glass transition temperature of not less than 60~C are respectively bonded to the ends of a polymer block (B1) having a glass transition temperature of not more than 25~C; (2) the polymer block (B1) is mainly composed of a unit derived from an acrylate ester, while the polymer block (B2a) and the polymer block (B2b) are mainly composed of a unit derived from a methacrylate ester, respectively; and (3) the weight average molecular weights of the polymer block (B2a) and the polymer block (B2b) are both lower than the weight average molecular weight of the polymer block (B1). The polylactic acid resin (A) and the acrylic triblock copolymer (B) may have a phase separation structure.

L~invention concerne une composition d~acide polylactique composée d~une résine (A) d~acide polylactique et d~un copolymère (B) acrylique tribloc, (1) ledit copolymère (B) acrylique tribloc étant un copolymère tribloc au sein duquel un bloc polymérique (B2a) et autre bloc polymérique (B2b), ayant tous deux une température de transition vitreuse supérieure ou égale à 60 ~C, sont respectivement liés aux extrémités d~un bloc polymérique (B1) ayant une température de transition vitreuse inférieure ou égale à 25 ~C, (2) ledit bloc polymérique (B1) étant principalement composé d~une unité dérivée d~un ester d'acrylate et ledit bloc polymérique (B2a) et ledit bloc polymérique (B2b) étant principalement composés d~une unité dérivée d~un ester de méthacrylate, respectivement ; et (3) les masses moléculaires moyennes pondérales du bloc polymérique (B2a) et du bloc polymérique (B2b) étant toutes les deux inférieures à la masse moléculaire moyenne pondérale du bloc polymérique (B1). La résine (A) d'acide polylactique et le copolymère (B) acrylique tribloc peuvent avoir une structure de séparation de phase.

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