Process for the preparation of compounds containing hydroxyl gro

Details Process for the preparation of compounds containing hydroxyl gro Process for the preparation of compounds containing hydroxyl gro

1992-12-04

1994-08-16

Kight, III, John

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

Synthetic resins

Process of treating scrap or waste product containing solid...

2521822, 25218224, 521 49, 525452, 525457, 525458, 525459, 525460, 528 85, 568700, C08J 1104

Patent

active

053387635

ABSTRACT:
Compounds containing alcoholic hydroxyl groups suitable as a starting material for the isocyanate polyaddition process by the alcoholysis of polyisocyanate polyaddition products are produced. Polyurethane urea or polyurea waste products having a molar ratio of urea groups to urethane groups of from 1:20 to 1:0 are heated in size reduced form to temperatures of from 120.degree. to 250.degree. C. together with B) polyhyhdric alcohols in the molecular weight range of from 62 to 250 in a ratio by weight of A:B of from 3:1 to 1:10. At least 10% of the polyhydric alcohol B put into the process is subsequently removed by distillation under reduced pressure. A total of up to 1000% by weight, based on the weight of polyurethane urea or polyurea waste A, of one or more polyhydroxy compounds having a molecular weight above 250 which is (are) not volatile under the distillation conditions may optionally be added to the mixture before and/or after removal of the excess alcohol B by distillation. The resulting compounds containing hydroxyl groups may be used as starting material for the production of polyurethane resins by the isocyanate polyaddition process.

REFERENCES:
patent: 3738946 (1973-06-01), Frulla et al.
patent: 4316992 (1982-02-01), Gerlock et al.

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