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US 5,686,540 AGranted
Process for the preparation of lactic acid-based polyester
AssigneeDainippon Ink and Chemicals, Inc.
InventorYasutoshi Kakizawa
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AssigneeDainippon Ink and Chemicals, Inc.
InventorYasutoshi Kakizawa
Estimating the term…
The present invention provides a process for the preparation of a biodegradable lactic acid-based polyester composition excellent in thermal stability, storage stability, flexibility, heat resistance, mechanical and physical properties and moldability which comprises kneading a lactic acid-based polyester and a polyester consisting of dicarboxylic acid component(s) and diol component(s) with a chelating agent, an acidic phosphoric acid ester, a molecular weight increasing agent, etc., and then devolatizing the kneaded mixture. The present invention also provides a molding process of the foregoing lactic acid-based polyester composition. A novel process for the preparation of a lactic acid-based polyester composition is provided, which comprises melt-kneading a lactic acid-based polyester (A), a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) and a chelating agent and/or acidic phosphoric acid ester (C) in an amount such that the weight ratio (A)/(B is from 99/1 to 10/90 and the proportion of (C) is 0.001 to 5 parts by weight based on 100 parts by weight of the sum of (A) and (B). A novel process for molding a lactic acid-based polyester composition is also provided, which comprises kneading a lactic acid-based polyester (A) and a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) with a chelating agent and/or acidic phosphoric acid ester (C), and then molding the material.
A process for the preparation of a lactic acid-based polyester composition, which comprises melt-kneading a lactic acid-based polyester (A), a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) and a chelating agent and/or acidic phosphoric acid ester (C) in an amount such that the weight ratio (A)/(B) is from 99/1 to 10/90 and the proportion of (C) is from 0.001 to 5 parts by weight based on 100 parts by weight of the sum of (A) and (B).
A process for the preparation of a lactic acid-based polyester composition, which comprises melt-kneading either of a lactic acid-based polyester (A) or a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) with a chelating agent and/or acidic phosphoric acid ester C), and then melt-kneading the resulting material with the remainder of said polyester (A) or said polyester (B), or comprises melt-kneading a lactic acid-based polyester (A) with a chelating agent and/or acidic phosphoric acid ester (C) and melt-kneading a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) with a chelating agent and/or acidic phosphoric acid ester (C), separately, and then melt-kneading the both resulting materials, wherein the weight ratio (A)/(B) is from 99/1 to 10/90 and the proportion of (C) is from 0.001 to 5 parts by weight based on 100 parts by weight of the sum of (A) and (B).
A process for the preparation of a lactic acid-based polyester composition, which comprises melt-kneading a melt-kneaded mixture of a lactic acid-based polyester (A) and a chelating agent and/or acidic phosphoric acid ester (C) with a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) in an amount such that the weight ratio (A)/(B) is from 99/1 to 10/90 and the proportion of (C) is from 0.001 to 5 parts by weight based on 100 parts by weight of the sum of (A) and (B).
A molding process of a lactic acid-based polyester composition, which comprises kneading a lactic acid-based polyester (A) and a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s) with a chelating agent and/or acidic phosphoric acid ester (C), and then molding the material.
A molding process of a lactic acid-based polyester composition, which comprises melt-kneading a lactic acid-based polyester (A) and a polyester (B) consisting of dicarboxylic acid components) and diol component(s) with a chelating agent and/or acidic phosphoric acid ester (C), removing volatile components from the material under reduced pressure, and then molding the material.
A molding process of a lactic acid-based polyester composition, which comprises melt-kneading a lactic acid-based polyester (A) with a chelating agent and/or acidic phosphoric acid ester (C), removing volatile components from the material under reduced pressure, and then kneading the material with a polyester (B) consisting of dicarboxylic acid component(s) and diol component(s), and then molding the material.
Dependencies are inferred from the claim text.