Mixtures for preparing hard polyurethane foams

Details Mixtures for preparing hard polyurethane foams Mixtures for preparing hard polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08G 18/40 (2006.01) C08G 18/79 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2187652

Mixtures leading to hard polyurethane foamed materials, which mixtures are preferably present in a pressure vessel, contain a) prepolymers containing isocyanate groups, obtainable by the reaction of polyisocyanates containing isocyanurate groups and optionally urethane groups with compounds having at least two hydrogen atoms which are reactive to isocyanates and having a molecular weight of 62 to 10,000, wherein the content of monomeric polyisocyanate in the prepolymer is less than 2 weight %, b) auxiliary process materials and additives known in the art, and c) foaming agents having a boiling point less than 0°C/760 mm Hg.

Des mélanges qui permettent d'obtenir des mousses dures en polyuréthanne et qui sont conservés de préférence dans un réservoir sous pression contiennent: (a) des prépolymères qui contiennent des groupes isocyanate obtenus par réaction de polyisocyanates contenant des groupes isocyanurate et le cas échéant des groupes uréthanne avec des composés ayant au moins deux atomes d'hydrogène susceptibles de réagir avec les isocyanates et un poids moléculaire compris entre 62 et 10.000, la teneur en polyisocyanate monomère du prépolymère étant inférieure à 2 % en poids; (b) des additifs et adjuvants connus en soi; et (c) des agents gonflants avec un point d'ébullition inférieur à 0 ~C/760 mm Hg.

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