Process for the preparation of flexible polyurethane foams

Details Process for the preparation of flexible polyurethane foams Process for the preparation of flexible polyurethane foams

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01) C08G 18/63 (2006.01) C08J 9/00 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2360532

Process for the preparation of flexible polyurethane foams comprising the steps of (a) bringing together a polyol component, a polyisocyanate component, a blowing agent comprising liquid carbon dioxide, a suitable catalyst and optionally ancillary chemicals at sufficient pressure to maintain the carbon dioxide in a liquid state, and (b) releasing the pressure and allowing the mixture obtained in step (a) to react into a flexible polyurethane foam, wherein the polyol component comprises a polymer polyol consisting of at least one polyether polyol having an average nominal functionality of at least 2.5 with dispersed therein from 2 to 50 wt% based on total weight of polymer polyol of polymer particles, whereby the particle size of essentially none of these polymer particles exceeds 50 micron.

Procédé servant à préparer des mousses de polyuréthanne souples et consistant à: (a) mettre en contact un constituant de polyol, un constituant de polyisocyanate, un agent soufflant contenant du dioxyde de carbone liquide, un catalyseur approprié et éventuellement des agents chimiques auxiliaires à une pression suffisante pour maintenir le dioxyde de carbone à l'état liquide et (b) relâcher la pression et laisser réagir le mélange obtenu à l'étape (a) afin d'obtenir une mousse de polyuréthanne souple. Le constituant de polyol comprend un polyol polymère constitué par au moins un polyol de polyéther possédant une fonctionnalité nominale moyenne d'au moins 2,5 dans lequel sont dispersées de 2 à 50 % du poids total du polyol polymère de particules polymères, dont la dimension ne dépasse pas 50 microns.

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