申请人:Mitsui Chemicals, Inc.
公开号:EP2045293A1
公开(公告)日:2009-04-08
An object of the present invention is to provide a resin composition having improved heat resistance (high crystallinity) and transparency without impairing rigidity which a polylactic acid resin inherently has, and a molded article composed of the resin composition. A polylactic acid resin composition of the present invention contains 100 parts by weight of a polylactic acid compound (A) having a specific moiety represented by the formula (1): -X1-R1-X2- and having a weight average molecular weight (Mw) of 5,000 to 500,000, 5 to 2,000 parts by weight of a lactic acid resin (B) and 0.1 to 10 parts by weight of at least one kind of a transparent nucleating agent (C) selected from carboxylic acid amides, aliphatic alcohols and aliphatic carboxylic acid esters. In the formula (1), X1 and X2 each independently represent an oxygen atom, a sulfur atom or an NH group, R1 represents an aliphatic hydrocarbon group having a weight average molecular weight of 25 to 50, 000 without containing a ring structure, and the hydrocarbon group may contain an oxygen atom, a nitrogen atom or a sulfur atom.
本发明的目的是提供一种树脂组合物,该树脂组合物具有更好的耐热性(高结晶度)和透明性,同时不损害聚乳酸树脂固有的刚性,以及由该树脂组合物组成的模塑制品。本发明的聚乳酸树脂组合物含有 100 重量份的聚乳酸化合物 (A),该化合物具有由式 (1) 表示的特定分子:-X1-R1-X2-且重量平均分子量(Mw)为 5,000 至 500,000 的聚乳酸化合物(A)、5 至 2,000 重量份的乳酸树脂(B)和 0.1 至 10 重量份的至少一种透明成核剂(C),透明成核剂选自羧酸酰胺、脂肪醇和脂肪族羧酸酯。在式 (1) 中,X1 和 X2 各自独立地代表一个氧原子、一个硫原子或一个 NH 基团,R1 代表一个重量平均分子量为 25 至 50,000 且不含环状结构的脂肪族烃基,该烃基可包含一个氧原子、一个氮原子或一个硫原子。