Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1985-12-09
1987-01-20
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521172, C08G 1814
Patent
active
046380175
ABSTRACT:
A water-absorbing sponge comprises at least one of a sulfo- group containing polyurea and polyurethane, the polymer containing at least one sulfonate equivalent per 20,000 molecular weight units.
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U.S.S.N. 562,459, U.S.S.N. 739,542, (copies not included).
Hedrick Steven T.
Larson Wayne K.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Sherman Lorraine R.
Smith James A.
Welsh Maurice J.
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