Method for the preparation of semi-rigid polyurethane modified p

Details Method for the preparation of semi-rigid polyurethane modified p Method for the preparation of semi-rigid polyurethane modified p

1985-04-15

1986-02-04

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521118, 521129, 521130, 521131, 521167, 521174, 521176, C08G 1814

Patent

active

045687021

ABSTRACT:
Polyurethane modified polyurea foams having a finer cell structure and an increased volume of finished product are prepared by reacting crude organic di- or polyisocyanates with a mixture of polyether polyols and an alkylene or dialkyl carbonate in the presence of a tertiary amine catalyst, a silicone surfactant and a blowing agent selected from water, which reacts with the di- or polyisocyanate to generate CO.sub.2, fluorocarbons having a boiling point below 60.degree. C. and mixed with water and methylene chloride mixed with water.

REFERENCES:
patent: 3751392 (1973-08-01), Olstowski
patent: 4033908 (1977-07-01), Hopkins et al.
patent: 4071482 (1978-01-01), Hopkins et al.

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