Bayer Corporation

Miles Inc.

Richard A Riccitelli

William E Slack

Sanjeev Madan

Charles M Milliren

Ronald Zibert

William E Miller

A Leslie Peterson

This invention relates to flexible foams and flexible molded foams prepared from an isocyanate component comprising an allophanate-modified diphenylmethane diisocyanate. The present invention also relates to processes for the production of these flexible foams and flexible molded foams.

Flexible foams and flexible molded foams based on allophanate-modified

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.

Process for preparing flexible polyurethane foams and foams thus obtained

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Monaca, PA, United States of America

Richard A Riccitelli