Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1980-10-14
1982-03-30
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
525329, 525437, 525440, 525452, 528 45, 528 49, 528 59, 528 73, 524705, 524839, 524916, 523130, C08L 7500
Patent
active
043223273
ABSTRACT:
A novel slow-curing water-curable urethane prepolymer composition obtained by reacting (A) a hydrophilic urethane prepolymer which is a reaction product of a polyisocyanate and a hydrophilic polyol prepolymer and has at least two --NCO groups and (B) a blocking agent selected from a class consisting of heterocyclic compounds having an ##STR1## structure in the molecule thereof, hydroxypyridines and hydroxyquinolines in the proportion that the equivalent ratio of the .dbd.NH groups of the --OH groups in the blocking agent (B) to the --NCO groups in the hydrophilic urethane prepolymer (A), that is, --OH or .dbd.NH/--NCO ratio, is 0.05 to 2 is disclosed. This composition is remarkably useful as a grouting material, for forming hydrogel which is effective as a fixative or carrier of various materials, as a vehicle for coating materials, and as a stabilizer and thickener for aqueous resin emulsions.
REFERENCES:
patent: 4016120 (1977-04-01), Matsuda et al.
patent: 4098933 (1978-07-01), Burkhardt et al.
patent: 4200725 (1980-04-01), Gras et al.
Hijikata Kenji
Hosokawa Noritaka
Yoshimura Naoki
Mitsubishi Petrochemical Co. Ltd.
Welsh Maurice J.
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