Process for preparing polyurethane foams having zones of...

Details Process for preparing polyurethane foams having zones of... Process for preparing polyurethane foams having zones of...

C - Chemistry, Metallurgy

08

J

18/647

C08J 9/32 (2006.01) A47C 7/18 (2006.01) B29C 44/04 (2006.01) B29C 67/20 (2006.01) C08J 9/00 (2006.01)

Patent

CA 1283765

28156-2 ABSTRACT OF THE DISCLOSURE PROCESS FOR PREPARING POLYURETHANE FOAMS HAVING ZONES OF DIFFERING HARDNESS A process for preparing a polyurethane foamed article comprising a hard foam encapsulated by a soft foam is provided. The process provides improved encapsulation over that described in EP 68820 by frothing the hard foam formulation, with for example carbon dioxide, before it is introduced onto the rising soft foam formulation. The hard foam formulation is frothed so that it's density is between 75% and 145% of the soft foam formulation.

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