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
1996-02-23
1998-02-10
Niland, Patrick
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...
524539, 524839, 524840, C08J 300, C08K 320, C08L 7500
Patent
active
057170240
ABSTRACT:
A process for preparing aqueous dispersions of polyurethanes comprises dispersing polyurethane prepolymer containing unreacted --NCO functionality in water with moderate agitation at a temperature at or below 65.degree. C., preferably at or below 38.degree. C., and more preferably within the range 38.degree.-25.degree. C.; simultaneously reducing the agitation to a mild rate and maintaining the temperature within the range 38.degree.-85.degree. C., preferably, 60.degree.-65.degree. C., until the reaction of --NCO with water levels off; adding an effective amount of a quenching agent to react with sufficient --NCO functionality to reduce the number of available --NCO groups that can react with water so that the evolution of CO.sub.2 is reduced or eliminated during storage of the polyurethane dispersion; and at any of the previous sequential steps adding an effective amount of a deaerating agent to reduce or eliminate CO.sub.2 foaming or to liberate any dissolved CO.sub.2 gas.
REFERENCES:
patent: 4501852 (1985-02-01), Markusch et al.
D. Dietrich, "Aqueous Emulsions, Dispersions and Solutions of Polyurethanes; Synthesis and Properties", Progress in Organic Coatings, 9 (1981) pp. 281-340.
James W. Rosthauser and Klaus Nachtkamp, "Waterborne Polyurethanes", Adv. Urethane Science and Technology, 1987, pp. 121-162.
Full Andrew P.
Kielbania Andrew J.
Kukkala Pravin K.
Tontisakis Antonios
Gennaro Jane E.
National Starch and Chemical Investment Holding Corporation
Niland Patrick
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