Process for producing flexible polyurethane foam

Details Process for producing flexible polyurethane foam Process for producing flexible polyurethane foam

2005-07-28

2010-06-15

Cooney, John (Department: 1796)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S123000, C521S130000, C521S170000, C521S174000

Reexamination Certificate

active

07737192

ABSTRACT:
A flexible polyurethane foam is produced by blending a polyurethane raw material containing a polyol, a polyisocyanate, a blowing agent, and a catalyst with an inorganic compound hydrate having a specific gravity of 1.5 to 4.0 and reacting the above polyurethane raw material to effect foaming and curing. The inorganic compound hydrate is preferably an iron sulfate hydrate, a calcium sulfate hydrate, or a magnesium sulfate hydrate. The above inorganic compound hydrate preferably has decomposition temperature of from 100 to 170° C. Then, an increase in exothermic temperature owing to the above foaming and curing is diminished by evaporation of water formed through decomposition of the above inorganic compound hydrate.

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