Molding of open cell soft polyurethane foam utilizing release ag

Details Molding of open cell soft polyurethane foam utilizing release ag Molding of open cell soft polyurethane foam utilizing release ag

1989-12-21

1992-05-12

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264130, 264300, 264338, B29C 3358

Patent

active

051125439

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.

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