Process for preparing flexible polyurethane foams and foams thus

Details Process for preparing flexible polyurethane foams and foams thus Process for preparing flexible polyurethane foams and foams thus

1992-08-04

1995-02-21

Kuhns, Allan R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264 54, 521174, C08G 1870

Patent

active

053915860

ABSTRACT:
A 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 includes toluene diisocyanate having a 2,4-isomer to 2,6-isomer ratio is greater than 80:20. The invention encompasses a process for increasing softness of flexible foams by reacting a secondary hydroxyl terminated polyol with a polyisocyanate in the presence of a blowing agent of carbon dioxide derived from the polyisocyanate/water reaction, a substantially low amount of an auxiliary blowing agent, and the polyisocyanate including 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.

REFERENCES:
patent: 2929802 (1960-03-01), Katz
patent: 3072582 (1963-01-01), Frost
patent: 3325823 (1967-06-01), Boon
patent: 3360495 (1967-12-01), Muller et al.
patent: 3957889 (1976-05-01), Milligan et al.
patent: 4072637 (1978-02-01), Blount
patent: 4246356 (1981-01-01), Walmsley
patent: 4497913 (1985-02-01), Raes et al.
patent: 4782099 (1988-11-01), Dietrich et al.
Chemical Abstracts, vol. 109, No. 8, Abstract No. 55883q.

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