Flexible polyurethane foams having improved load bearing...

Details Flexible polyurethane foams having improved load bearing... Flexible polyurethane foams having improved load bearing...

C - Chemistry, Metallurgy

08

G

400/107, 403/14,

C08G 18/50 (2006.01) C08G 18/32 (2006.01) C08G 18/65 (2006.01) C08G 65/26 (2006.01)

Patent

CA 1248653

FLEXIBLE POLYURETHANE FOAMS HAVING IMPROVED LOAD BEARING CHARACTERISTICS AND MIXTURES USEFUL THEREIN ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of a flexible polyurethane foam comprising reacting an organic polyisocyanate and a polyol, in the presence of a blowing agent, a catalyst, and a foam stabilizer, the improvement wherein a foam of increased load bearing is obtained by including in the reaction mixture from about 8 to about 25 parts by weight per 100 parts by weight of said polyol of a mixture comprising (a) from 30 to 100 percent by weight of an addition product of an alkylene oxide and an aromatic diamine, said addition product having an average hydroxyl functionality of at least 2.5 and as high as 6, and having an hydroxyl number of from about 150 to about 810 and containing no free amine hydrogen, and (b) from 0 to 70 percent by weight of an alkanolamine having at least one hydroxyl group and having at least two active hydrogens, wherein the hydroxyl number of the combination of the polyol, the mixture, and any other isocyanate-reactive components, excluding water,is from 25 to 300, said process further being character- ized as being conducted in the absence of a tin catalyst.

480432

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