Method for the preparation of semi-rigid polyurethane...

Details Method for the preparation of semi-rigid polyurethane... Method for the preparation of semi-rigid polyurethane...

C - Chemistry, Metallurgy

08

J

403/30

C08J 9/08 (2006.01) C08G 18/48 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08K 5/109 (2006.01)

Patent

CA 1263799

ABSTRACT OF THE DISCLOSURE 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 CO2, fluorocarbons having a boiling point below 60°C and mixed with water and methylene chloride mixed with water.

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