Degradable copolymer and preparation process thereof
AssigneeMitsui Chemicals, Inc.
InventorsYuji Terado, Chojiro Higuchi, Masanobu Ajioka
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Abstract
A degradable copolymer obtained by heat-dehydration reaction of aromatic polycarbonate and aliphatic polyester in the presence of a catalyst, has degradability which cannot be exhibited by common aromatic polycarbonate, transparency equal to polycarbonate, thermal resistance which cannot be exhibited by common aliphatic polyester, melt flowability superior to common aromatic polycarbonate and other excellent characteristics, and thus can be widely used for processed articles which require severe properties.
Claims18
A preparation process of a degradable copolymer comprising reacting an aromatic polycarbonate having aromatic groups in the polymer backbone with an aliphatic polyester prepared from i) at least one aliphatic hydroxycarboxylic acid, ii) at least one aliphatic polyhydric alcohol and at least one aliphatic polybasic acid, iii) at least one alicyclic polyhydric alcohol and at least one aliphatic polybasic acid, or iv) mixtures thereof in the presence of a catalyst.
The preparation process of the degradable copolymer according to 1, wherein the aromatic polycarbonate has glass transition temperature of 100.degree. C. or more.
The preparation process of the degradable copolymer according to 1, wherein the aliphatic polyester is polylactic acid and/or a copolymer of lactic acid and the other hydroxycarboxylic acid.
A degradable copolymer comprising an aromatic polycarbonate block having aromatic groups in the polymer backbone and an aliphatic polyester block prepared from i) at least one aliphatic hydroxycarboxylic acid, ii) at least one aliphatic polyhydric alcohol and at least one aliphatic polybasic acid, iii) at least one alicyclic polyhydric alcohol and at least one aliphatic polybasic acid, or iv) mixtures thereof, wherein said copolymer has high transparency and a glass transition temperature higher than that of the aliphatic polyester forming the aliphatic polyester block.
Dependencies are inferred from the claim text.