Polyurethane foam molding with zones of different indentation ha

Details Polyurethane foam molding with zones of different indentation ha Polyurethane foam molding with zones of different indentation ha

1982-01-15

1983-04-12

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521159, 521160, 521917, 264 451, 264 455, 264 458, 264 462, 264 463, 296 63, C08G 1814

Patent

active

043798560

ABSTRACT:
A deformable and durable polyurethane foam molding is made from the reaction product of a polyether 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 subsequently removed from the mold cavity. These polyurethane foam moldings are particularly useful in making seat cushions.

REFERENCES:
patent: 3182104 (1965-05-01), Cwik
patent: 3519708 (1970-07-01), McMichael
patent: 3534129 (1970-10-01), Bartel

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