Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1996-10-15
1998-02-17
Acquah, Samuel A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528274, 528288, 528289, 528293, 528355, 528361, 524714, 524717, C08G 6306
Patent
active
057192561
ABSTRACT:
The invention provides a novel preparation process of a polycondensation type polymer, an excellent polymer which is represented by lactic acid and the preparation process of the polymer, a polycondensation agent used for the preparation process, and an intermediate. Specifically, the invention provides a preparation process of the polycondensation type polymer, for example, polyamide, polyimide, polythioester and polyester, comprising bonding a carboxyl group comprising compound with an active hydrogen group comprising compound in the presence of haloiminium salt. The invention provides excellent polylactic acid having a controlled D/L-isomer ratio in the repeating structural units and preparation process of polylactic acid, and further provides a haloiminium salt compound used for the preparation process and an intermediate compound of acid chloride.
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patent: 5605944 (1997-02-01), Heebner
Goto Ken-ichi
Kataoka Toshiyuki
Kohgo Osamu
Kuroki Takashi
Mizuta Hideki
Acquah Samuel A.
Mitsu Toatsu Chemicals, Inc.
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