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US 4,383,100 AGranted
Polyurethanes from oligomeric formal diols of THF copolymer glycols
AssigneeE. I. Du Pont de Nemours and Company
InventorEngelbert Pechhold
Life of this patent
Estimating the term…
Abstract
Oligomeric formal diols are prepared by coupling segments of copolyether glycols with formaldehyde. The formal diols are useful in preparing polyurethanes.
Claims6
A polyurethane which is the reaction product of
- (a) an oligomeric formal diol made by coupling segments of copolymers of tetrahydrofuran and an alkylene oxide whose ring contains 2 or 3 carbon atoms with formaldehyde, the diol having a number average molecular weight of 1200-12000,
- (b) an organic polyisocyanate, and
- (c) a chain extender.
An oligomeric formal diol made by coupling copolyether glycol segments with formaldehyde.
Dependencies are inferred from the claim text.