Process for preparing polyurethane foams having reduced voc...

C - Chemistry – Metallurgy – 08 – G

Patent

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C08G 18/38 (2006.01) C08G 18/61 (2006.01)

Patent

CA 2567850

A process for preparing a polyurethane foam is provided which comprises reacting a polyisocyanate and an active hydrogen-containing component, e.g., water and an organic polyol , and an effective amount of a silicone-based surfactant composition as a stabilizer for the foam, the silicone-based surfactant composition comprising a first silicone having from about 2 to about 205 siloxane repeat units of the general formula: M*tDXD*yMU wherein M* is R 1 2RSiO0.5; D is R 12 SiO; D* is R1 RSiO; M is R13 SiO0.5R 12R 2 SiO0.5; R1 is an aromatic or saturated aliphatic hydrocarbon group; R is a divalent hydrocarbon moiety, optionally interrupted with methoxy or ethoxy groups, and having a hydroxyl end group, t and u are 0-2; t+u=2; x+y=1 -200 and t+y is at least 1, in the presence of a blowing agent and under conditions sufficient to form the polyurethane foam.

L'invention porte sur un procédé de préparation d'une mousse de polyuréthane, ce procédé consistant à faire réagir un polyisocyanate et un composé contenant de l'hydrogène actif, tel que de l'eau et un polyol organique, et une quantité effective d'une composition de tensioactifs à base de silicone jouant le rôle d'agent stabilisant de la mousse, cette composition comprenant un premier silicone possédant environ 2 à environ 205 motifs de répétition de siloxane de formule générale: M*¿t?D<SB>X</SB>D*¿y?M<SB>U</SB>, dans laquelle M* représente R?1¿ ¿2?RSiO¿0.5?; D représente R?1¿¿2? SiO; D* représente R?1¿ RSiO; M représente R?1¿¿3? SiO¿0.5?R?1¿¿2?R?2¿ SiO¿0.5?; R?1 ¿représente un groupe d'hydrocarbures aromatiques ou aliphatiques saturés; R représente une fraction d'hydrocarbure divalente, éventuellement interrompue par des groupes méthoxy ou éthoxy, et possédant un groupe à terminaison hydroxyle, t et u représentent 0 à 2; t+u=2; x+y=1 -200 et t+y est au moins 1, en présence d'un agent gonflant et dans des conditions suffisantes pour former la mousse de polyuréthane.

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