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US 5,508,378 AGranted
Method for producing polylactic acid
AssigneeShimadzu Corporation
InventorsHitomi Ohara, Seiji Sawa, Tatsushi Kawamoto
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Abstract
A method for producing a polylactic acid of the present invention includes the steps of (a) polymerizing a lactide used as a main starting material in a molten state to give a polylactic acid; and (b) further polymerizing the polylactic acid obtained in step (a) in a solid phase by heating at a temperature lower than a melting point of a final polymer product.
Claims14
A method for producing a polylactic acid comprising the steps of:
- (a) partially polymerizing a lactide used as a main starting material in a molten state to give a polylactic acid;
- and
- (b) further polymerizing the polylactic acid obtained in step (a) in a solid phase by heating at a temperature lower than a melting point of a final polymer product.
A polylactic acid produced by the process comprising:
- (a) partially polymerizing a lactide used as a main starting material in a molten state to give a polylactic acid;
- and
- (b) further polymerizing the polylactic acid obtained in step (a) in a solid phase by heating at a temperature lower than a melting point of a final polymer product.
Dependencies are inferred from the claim text.