Method for producing soft to semi-rigid polyurethane...

Details Method for producing soft to semi-rigid polyurethane... Method for producing soft to semi-rigid polyurethane...

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08J 9/34 (2006.01)

Patent

CA 2394169

The invention provides a process for the production of flexible to semi-rigid polyurethane shaped articles with a compacted edge zone of given hardness and a significantly more flexible cell core, so-called integral foams, in which non--combustible mixtures of fluoroalkanes which comprise 1,1,1,3,3- pentafluorobutane (R 365mfc) are employed as physical blowing agents.

L'invention concerne un procédé permettant de produire des corps moulés en polyuréthane souples à demi-durs comportant une zone marginale compactée de dureté définie et présentant un noyau cellulaire nettement plus souple, ce qu'il est convenu d'appeler les mousses intégrales. Dans ces mousses, les agents porogènes physiques utilisés sont des mélanges non inflammables de fluoroalcanes, qui contiennent du 1,1,1,3,3-pentafluorobutane (R 365mfc).

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