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:
May. 12, 1992
Filed:
Dec. 21, 1989
Christian Thary, Farmington Hills, MI (US);
Creme Art Corporation, Walled Lake, MI (US);
Abstract
A method for molding open cell soft polyurethane foam and a release agent utilized in the method are disclosed as incorporating an aqueous gel coated (30) onto interior surfaces (18,20) of a mold (10) prior to introduction of a foamable liquid polyurethane mixture (32) whose foaming fills the mold cavity (22) as the aqueous gel functions as a solventless release agent that has good lubricity to facilitate filling of the cavity by the foam (34), prevents bonding of the foam (34) to the mold and also provides a thin film-like escape passage (36) for gas generated during the foaming. An acrylic acid polymer that is acid neutralized is preferably utilized to provide the aqueous gel. The acrylic acid polymer and acid neutralizer are most preferably sprayed as separate aqueous mixtures onto the interior mold surfaces to provide the aqueous gel.