Patent · US Expired

Polyurethanes prepared with tetrahydrofuran-alkylene oxide polymerizates having low oligomeric cyclic ether content

US4224432A · kind A · utility

12Cited by

2References

10Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Engelbert Pechhold · Chadds Ford, US
Ivan M. Robinson · Wilmington, US

Key dates

Filing date	Dec 11, 1978
Grant date	Sep 23, 1980
Priority date	—
Expiry date	Dec 11, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/4854
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The resistance to degradation on exposure to high temperatures, water and organic liquids of a polyurethane prepared by reacting a tetrahydrofuran/alkylene oxide polymerizate, an organic polyisocyanate and a chain extender is significantly improved by using a tetrahydrofuran/alkylene oxide polymerizate which contains no more than about 3%, by weight, of oligomeric cyclic ethers.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.