Lactic acid containing hydroxycarboxylic acid for the preparatio

Details Lactic acid containing hydroxycarboxylic acid for the preparatio Lactic acid containing hydroxycarboxylic acid for the preparatio

1995-06-07

1996-04-30

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528271, 528274, 528275, 528283, 528354, 528357, 524755, 524784, C08G 6306

Patent

active

055126537

ABSTRACT:
A preparation process of polyhydroxycarboxylic acid having an inherent viscosity of 0.3 dl/g or more by dehydrating polycondensation of lactic acid containing hydroxycarboxylic acid in an organic solvent in the presence or absence of a catalyst, comprising using a hydroxycarboxylic acid raw material which comprises one or more impurities selected from the group consisting of methanol, ethanol, acetic acid, pyruvic acid, fumaric acid, methyl lactate, ethyl lactate and butyl lactate in a total amount of 0.3% by mole or less for the amount of said hydroxycarboxylic acid raw material.

REFERENCES:
patent: 4273920 (1981-06-01), Nevin
patent: 5302894 (1994-04-01), Buchholz
patent: 5310865 (1994-05-01), Enomoto et al.
H. G. Ellas, "Makromolekule Band 1, Grundlagen", 1990, pp. 231-232.
Database WPI, Week 8717, JPA-62064823.
Chemical Abstracts, vol. 120, No. 10, Mar. 7, 1994, Abstract No. 10788 m.

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