Process for the production of oligoesters containing hydroxy gro

Details Process for the production of oligoesters containing hydroxy gro Process for the production of oligoesters containing hydroxy gro

1987-06-23

1988-07-12

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521172, 521173, 528 76, 528 77, 528 78, 528 79, 528291, 560 88, 560 91, C08G 1814

Patent

active

047570970

ABSTRACT:
Oligoesters having hydroxyl groups and an OH number of from 200 to 600 mg KOH/g are made by reacting a cyclic dicarboxylic acid anhydride in which no halogen is present with a polyfunctional alcohol or dialkanolamine in a molar ratio of from 1:0.5 to 1:1.5 at a temperature of from 50.degree. to 150.degree. C. to form the corresponding dicarboxylic acid semiester and/or semiamide. This semiester and/or semiamide is then alkoxylated with ethylene oxide and/or propylene oxide in the presence of a catalyst at 80.degree. to 150.degree. C. The equivalent ratio of acid groups to alkylene oxide groups is from 1:0.8 to 1:1.7. The catalysts are reaction products of alkoxides with at least 3 C-atoms with ammonia, piperidine, piperazine and/or C.sub.2 -C.sub.6 aliphatic, polyamines, preferably diamines in which all of the NH-functional groups have been alkoxylated. The resultant oligoester may then be reacted with a polyisocyanate optionally in the presence of known additives, such as blowing agents and catalysts.

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Methoden der Organischen Chemie, vol. VIII, 1952, pp. 531-533, Houben-Weyl, Georg Thieme Verlag.

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