Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1999-04-27
2000-10-31
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528274, 528283, 528491, 528492, 528499, 528503, 524745, 524784, C08G 6306, C08K 541
Patent
active
061404586
ABSTRACT:
The invention provides a process for producing high-molecular aliphatic polyesters capable of being substitutes for general-purpose resins that are required to have high toughness, in a simplified manner and at a high volume efficiency. Specifically, in the process, used as the starting material is an easily-available, low-molecular aliphatic polyester prepolymer to be prepared through polycondensation of inexpensive materials of an aliphatic hydroxycarboxylic acid such as lactic acid, glycolic acid or the like, an aliphatic polyalcohol such as butanediol or the like, and an aliphatic polycarboxylic acid such as succinic acid or the like, and the starting prepolymer is crystallized and thereafter polycondensed in a solid phase in the presence of a catalyst to give the intended, tough and high-molecular aliphatic polyester.
REFERENCES:
patent: 4057537 (1977-11-01), Sinclair
Ajioka Masanobu
Hiraoka Shoji
Kotaki Yasushi
Ogawa Shinji
Sakai Masayuki
Acquah Samuel A.
Mitsui Chemicals Inc.
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