Open-celled rigid polyurethane foam

Details Open-celled rigid polyurethane foam Open-celled rigid polyurethane foam

C - Chemistry, Metallurgy

08

J

C08J 9/04 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01) C08L 75/08 (2006.01)

Patent

CA 2265799

Disclosed is a process for preparing an open-celled rigid polyurethane foam by reacting a polyisocyanate with a polyol in the presence of a blowing agent, usually water, and a cell opening agent. The cell opening agent comprises a combination of a polyoxyalkylene polysiloxane having a cloud point of 65°C or less, and a second substance that has a critical surface free energy of less than about 23mJ/m2. Highly preferred as second substance is fine particulate poly(tetrafluorethylene) polymer.

L'invention concerne un procédé de préparation d'une mousse de polyuréthanne rigide à alvéoles ouvertes, par réaction d'un polyisocyanate avec un polyol en présence d'un agent gonflant, généralement de l'eau, et d'un agent d'ouverture des alvéoles. Cet agent d'ouverture des alvéoles comprend un polyoxyalkykène polysiloxane dont le point de trouble est inférieur ou égal à 65 DEG C, combiné à une seconde substance dont la tension interfaciale critique est inférieure à 23mJ/m<2> environ. Cette seconde substance est de préférence un polymère de poly(tétrafluoroéthylène) sous forme de particules fines.

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