The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1995
Filed:
Aug. 04, 1992
A Leslie Peterson, Coraopolis, PA (US);
Richard A Riccitelli, Monaca, PA (US);
Miles Inc., Pittsburgh, PA (US);
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.