Preparation of rigid pu foams having small cell diameters...

Details Preparation of rigid pu foams having small cell diameters... Preparation of rigid pu foams having small cell diameters...

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08G 18/08 (2006.01) C08G 18/48 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2259588

A process for the preparation of fine-cell rigid polyurethane foams by the reaction of a) polyisocyanates with b) compounds having at least two reactive hydrogen atoms in the presence of c) expanding agents, d) catalysts and, optionally, e) auxiliaries and/or additives, where the expanding agents c) used are perfluoro compounds which are emulsified in at least one of the components a) or b), and water and air are removed from the components a) to e) prior to conversion to the polyurethane.

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