Rigid insulating polyurethane foams prepared from ternary...

Details Rigid insulating polyurethane foams prepared from ternary... Rigid insulating polyurethane foams prepared from ternary...

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08G 18/06 (2006.01) C08J 9/08 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2117728

Polyurethane foams blown with a mixture of water, HCFC-22 or HCFC-141b, and a perfluorinated hydrocarbon having from 3 to 8 carbon atoms yields polyurethane and polyisocyanurate foams having exceptional physical properties, i.e., small and uniform cells, low initial K-factor, low aged K-factor, and high tensile strength. The low initial and aged K-factors are most unexpected when it is considered that significant amounts of water are used to blow the foam.

Mousses de polyuréthane, soufflées avec un mélange d'eau, de HCFC-22 ou de HCFC-141b et un hydrocarbure perfluoré comptant de 3 à 8 atomes de carbone; on obtient des mousses de polyuréthane et de polyisocyanurate avec des propriétés physiques exceptionnelles, soit des cellules petites et uniformes, un faible facteur K initial, un faible facteur K à un stade avancé, et une forte résistance à la traction. Les faibles facteurs K initiaux et à un stade avancé sont très étonnants si on tient compte du fait que des quantités significatives d'eau sont employées pour le soufflage des mousses.

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