Molding of open cell soft polyurethane foam

Details Molding of open cell soft polyurethane foam Molding of open cell soft polyurethane foam

B - Operations, Transporting

29

C

B29C 33/62 (2006.01) B29C 37/00 (2006.01) B29C 44/34 (2006.01) C08L 33/02 (2006.01)

Patent

CA 2068659

A method for molding open cell soft polyurethane foam is disclosed as incorporating an aqueous gel (30) of an acrylic acid polymer that is coated 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. The acrylic acid polymer is preferably acid neutralized 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.

Méthode pour le moulage de mousse poreuse souple de polyuréthane, consistant à incorporer un gel aqueux (30) d'un polymère d'acide acrylique, appliqué sur les surfaces internes (18,20) d'un moule (10) avant l'introduction d'un mélange liquide de polyuréthane expansible (32), qui remplit les pores (22), le gel aqueux agissant comme un agent de démoulage sans solvant, avec un bon pouvoir lubrifiant qui facilite le remplissage des pores par la mousse (34); cela empêche la fixation de la mousse (34) au moule et forme un passage, sous forme de mince pellicule, pour la sortie (36) du gaz produit lors de l'expansion. Le polymère d'acide acrylique est de préférence neutralisé par un acide pour l'obtention du gel aqueux. On privilégie fortement la pulvérisation du polymère d'acide acrylique et du neutralisant acide sous forme de mélanges aqueux séparés sur les surfaces intérieures du moule pour la formation du gel aqueux.

Affiliated with

Also associated with

Rating

Molding of open cell soft polyurethane foam does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Molding of open cell soft polyurethane foam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Molding of open cell soft polyurethane foam will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1886990