Mixtures for the production of rigid polyurethane

Details Mixtures for the production of rigid polyurethane Mixtures for the production of rigid polyurethane

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/12 (2006.01) C08G 18/72 (2006.01) C08J 9/14 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2165507

Mixtures which react to produce rigid polyurethane foams which are preferably present in a pressure vessel. These foam-forming mixtures contain a) a prepolymer having isocyanate groups, obtainable by reaction of a polyphenyl-polymethylene polyisocyanate containing at least three aromatic nuclei with a compound having at least two hydrogen atoms that are reactive with isocyanate groups and a molecular weight of 62 to 10,000, b) known auxiliary substances and additives, and c) a blowing agent with a boiling point below 0°C/760 mm Hg.

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