Production of rigid polyurethanes foams with reduced density

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/14 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08L 75/04 (2006.01) F16L 59/00 (2006.01)

Patent

CA 2228937

A process for producing rigid polyurethane foams with reduced density by reacting a) organic and/or modified organic polyisocyanates with b) at least one higher-molecular-weight compound having at least two reactive hydrogen atoms and, if desired, e) low-molecular-weight chain extenders and/or crosslinkers in the presence of d) blowing agents, e) catalysts and, if desired, f) other auxiliaries and/or additives, is described, which comprises using, as blowing agent (d), a mixture of cyclopentane with at least one compound which is homogeneously miscible with cyclopentane selected from the class consisting of the alkanes and/or alkenes having 3 or 4 carbon atoms in the molecule and with the carbon dioxide produced from water and isocyanate, and using, as higher-molecular-weight compound (b) having at least two reactive hydrogen atoms, polyethers which contain aromatics and nitrogen. The use of the rigid foams produced in this way as insulating material is also described.

On décrit un procédé de production de mousses de polyuréthane rigides à densité réduite, par réaction a) de polyisocyanates organiques et/ou organiques modifiés avec b) au moins un composé de masse moléculaire plus élevée possédant au moins deux atomes d'hydrogène réactifs et, si on le désire, e) des allongeurs de chaîne et/ou des agents de réticulation de faible masse moléculaire en présence d) de gonflants, e) de catalyseurs et, si on le désire, f) d'autres substances auxiliaires et/ou additifs. Ce procédé comprend l'utilisation, comme gonflant (d), d'un mélange constitué de cyclopentane et d'au moins un composé miscible de façon homogène avec le cyclopentane, choisi parmi la classe de composés comprenant des alcanes et/ou des alcènes à 3 ou 4 atomes de carbone dans la molécule, et avec le dioxyde de carbone produit à partir de l'eau et de l'isocyanate, et, comme composé de masse moléculaire plus élevée (b) possédant au moins deux atomes d'hydrogène réactifs, des polyéthers contenant des substituants aromatiques et de l'azote. On décrit aussi l'utilisation, comme matériaux isolants, de mousses rigides produites grâce à ce procédé.

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