Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
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.
Harnden Robert M.
Herrington Ronald M.
Turner Robert B.
The Dow Chemical Company
Welsh Maurice J.
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