Densifiable and re-expandable polyurethane foam

Details Densifiable and re-expandable polyurethane foam Densifiable and re-expandable polyurethane foam

1990-07-02

1991-07-16

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521174, 521918, 528 44, 528 76, 528502, 528503, C08G 1814

Patent

active

050326228

ABSTRACT:
Polyurethane foams having a specified glass transition temperature are densified for transportation or other purposes by heating the foam to a temperature above its T.sub.g, compressing the heated foam, and then cooling the compressed foam to a temperature below its T.sub.g. The cooled foam remains in a densified state until re-heated to a temperature above its T.sub.g, whereupon it re-expands to assume its original dimensions.

REFERENCES:
patent: 4980386 (1990-12-01), Tiao et al.

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