Process for preparing elastic polyurethane slabstock foams

Details Process for preparing elastic polyurethane slabstock foams Process for preparing elastic polyurethane slabstock foams

1997-05-20

2000-08-08

Short, Patricia A.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521170, 521174, 521176, C08J 930

Patent

active

061003093

ABSTRACT:
A present invention relates to a process for preparing elastic, flexible slabstock foams by reacting polyisocyanates with at least one polyol having a molecular weight from 2,000 to 10,000, having a functionality of 2 to 4, which have at least two hydrogen atoms capable of reacting with said polyisocyanates; at least one polyol having a molecular weight from 400 to 4,000, having a functionality of 4 to 8 and having at least four hydrogen atoms capable of reacting with isocyanates; water and optionally, organic blowing agents; stabilizers; activators; additives and auxiliary agents; optionally, low molecular weight cross-linking agents with a molecular weight of 32 to 399; and liquid CO.sub.2, which is used as an additional blowing agent, and is decompressed in a decompression chamber containing fine-meshed gratings upstream of the discharge point to the conveyer belt.

REFERENCES:
patent: 4500656 (1985-02-01), Rasshofer
patent: 5643970 (1997-07-01), Sulzbach
Oertel, Gunter, Polyurethane Handbook, p. 194 Hanser Publishers, N.Y. (1994).

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