Polyurethane foam molding with zones of different...

Details Polyurethane foam molding with zones of different... Polyurethane foam molding with zones of different...

B - Operations, Transporting

29

C

18/646

B29C 44/04 (2006.01) B60N 2/70 (2006.01) C08G 18/08 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1173212

Mo-2310 Lea 20,660 A POLYURETHANE FOAM MOLDING, WITH ZONES OF DIFFERENT INDENTATION HARDNESS AND A PROCESS FOR ITS PRODUCTION ABSTRACT OF THE DISCLOSURE A deformable and durable polyurethane foam molding is made from the reaction product of a poly- ether polyol component and a polyisocyanate component. The polyether polyol component is a polyether having at least two hydroxyl groups, a molecular weight of from 400 to 10,000 and at least 10 wt. % hydroxyl groups which are primary hydroxyl groups. The polyisocyanate component is a mixture of from 60-90 wt. % 4,4'-diphenyl methane diisocyanate and from 3-30 wt. % 2,4'-diphenyl methane diisocyanate. Such reaction mixture is prepared in each of at least two mixing heads. The index of reaction mixture is different from that in the other mixing head. The mixture is then introduced into associated zones of a mold cavity where the mixture is allowed to foam. The molding is sub- sequently removed from the mold cavity. These poly- urethane foam moldings are particularly useful in making seat cushions. Mo-2310 LeA 20,660

393777

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