Process for preparing flexible polyurethane foams

Details Process for preparing flexible polyurethane foams Process for preparing flexible polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/48 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2100192

In accordance with the foregoing, the present invention encompasses an improved process for the production of flexible polyurethane foams by the reaction of a polyol and water with polyisocyanate in the presence of a blowing agent, the improvement wherein the polyisocyanate comprises toluene diisocyanate having a 2,4- isomer to 2,6-isomer ratio is greater than 80:20. In a presently preferred embodiment, the invention encompasses an improved process for increasing softness of flexible foams by reacting a secondary hydroxyl terminated polyol with a polyisocyanate in the pre- sence of a blowing agent, the improvement comprising the blowing agent consisting essentially of carbon dioxide derived from the polyisocyanate/ water reaction, a substantially low amount of an auxiliary blowing agent, and the polyisocyanate comprising toluene diisocyanate having a 2,4- isomer to a 2,6-isomer ratio greater than 80:20. It has been found that by the present invention that there is obtained flexible polyurethane foams having the unexpected properties of 15% to 23% softening, increased tear strength, increased tensile strength, and increased percent elongation, and very little change in compression set properties.

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