Process for rigid polyurethane foams

Details Process for rigid polyurethane foams Process for rigid polyurethane foams

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08G 18/76 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2318300

Process for preparing rigid polyurethane or urethane-modified polyisocyanurate foams comprising the step of reacting an organic polyisocyanate with a polyfunctional isocyanate-reactive component in the presence of a blowing agent mixture comprising from 50 to 90 % by weight of cyclopentane and from 10 to 50 % by weight of a mixture comprising isopentane and/or n-pentane and isobutane and/or n-butane wherein the weight ratio of isopentane and/or n- pentane over isobutane and/or n-butane is between 5/95 and 95/5.

Ce procédé de préparation de mousses rigides de polyuréthanne ou de polyisocyanurate modifié par uréthanne comprend l'étape consistant à faire réagir un polyisocyanate organique avec un constituant polyfonctionnel réagissant avec isocyanate, en présence d'un mélange d'agents de gonflement comprenant 50 à 90 % en poids de cyclopentane et 10 à 50 % en poids d'un mélange contenant isopentane et/ou n-pentane et isobutane et/ou n-butane, le rapport pondéral entre isopentane et/ou n-pentane, et isobutane et/ou n-butane étant compris entre 5/95 et 95/5.

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