Method for producing flexible to semi-rigid,integral skin...

Details Method for producing flexible to semi-rigid,integral skin... Method for producing flexible to semi-rigid,integral skin...

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08J 9/34 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2290377

The invention provides a process for preparing flexible to semi-rigid, integral skin polyurethane molded foams. This process reacting at least one organic polyisocyanate component or prepolymer thereof, with at least one polyol component having an OH value of 20 to 200 and, optionally, a polyol component with an OH value of 201 to 899, and from 3 to 20 wt.% of at least one chain lengthening agent with an OH or an amine value of 600 to 1850. The reaction occurs in the presence of water and from 0.2 to 10 parts by weight of a C6 hydrocarbon mixture comprising 2- methylpentane, 3- methylpentane, 2,3-dimethylbutane, and up to 10 wt.% of 2,2,-dimethylbutane. The C6 hydrocarbon mixture has a boiling point in the range of 55 to 65°C.

L'invention concerne un procédé permettant de produire des corps moulés de polyuréthane mous à mi-durs, présentant une zone marginale comprimée d'une dureté donnée et un noyau sensiblement plus mou, corps que l'on appelle mousses structurées, pour lesquels on utilise des agents moussants physiques de la série des hydrocarbures C6.

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