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
1992-11-17
1994-04-05
Michl, Paul R.
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...
528 44, 528 45, 528 65, 528 85, C08J 300, C08K 320, C08L 7500, C08G 1800
Patent
active
053005562
ABSTRACT:
The present invention is directed to a process for the preparation of an aqueous dispersion containing both a blocked polyisocyanate and a polyhydroxyl compound by reacting an aqueously dispersed polyisocyanate having an isocyanate content of at least 12% by weight, based on the weight of the polyisocyanate, with a monofunctional blocking agent which is more reactive with isocyanate groups than water at an equivalent ratio of monofunctional blocking groups to isocyanate groups of 0.5:1 to 2:1 in the presence of a polyhydroxyl compound which is either water soluble or water dispersible, wherein the polyhydroxyl compound is present in an amount which is sufficient to provide an equivalent ratio of hydroxyl groups to blocked isocyanate groups of 0.6:1 to 1.25:1.
REFERENCES:
patent: 4098933 (1978-07-01), Burkhardt et al.
patent: 4284544 (1981-08-01), Wegner et al.
patent: 4442259 (1984-04-01), Isgur et al.
patent: 4522851 (1985-06-01), Rosthauser
Rosthauser James W.
Tirpak Robin E.
Gil Joseph C.
Michl Paul R.
Miles Inc.
Niland P.
Roy Thomas W.
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