Method for producing foams from high acid polyester polyols

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/14 (2006.01) B29C 44/30 (2006.01) B32B 5/20 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08J 9/04 (2006.01)

Patent

CA 2239348

Closed cell, rigid polymer foams are prepared by (a) continuously conveying a carrier along a production line, (b) supplying on the carrier a foam-forming mixture comprising a polyisocyanate, a catalyst, a hydrogen-containing blowing agent or a mixture of the hydrogen-containing blowing agent and at least one co-blowing agent, and an isocyanate-reactive component comprising (i) a high acid polyester polyol having an acid number greater than 1, or (ii) a mixture of the high acid polyester polyol and at least one other isocyanate-reactive compound, (c) passing the carrier and mixture between two constricting members forming therebetween a metering gap, and (d) allowing the mixture after passing through the gap to freely expand to form a plastic foam, wherein the acid number and amount of the high acid polyester polyol in the mixture are sufficiently high to result in a superior resistance to cold temperature shrinkage.

La préparation de mousses polymériques rigides, à cellules fermées, consiste à : a) convoyer en continu un véhicule le long d'une ligne de production; b) acheminer sur le véhicule un mélange producteur de mousse, renfermant un polyisocyanate, un catalyseur, un gonflant contenant de l'hydrogène ou un mélange du gonflant contenant de l'hydrogène et d'au moins un co-gonflant, un composé réactif avec les isocyanates à base (i) d'un polyester-polyol à forte teneur en acide, possédant un indice d'acide supérieur à 1, ou (ii) un mélange du polyester-polyol à forte teneur en acide et d'au moins un autre composé réactif avec les isocyanates; c) faire passer le véhicule et le mélange entre deux éléments d'étranglement formant entre eux un espace de mesure; d) laisser le mélange, après passage à travers l'espace de mesure, s'expanser librement pour former une mousse de plastique, l'indice d'acide et la quantité de polyester-polyol à forte teneur en acide dans le mélange étant suffisamment élevés pour se traduire par une résistance supérieure au retrait à basse température.

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