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
1995-09-15
1997-06-10
Sergent, Rabon
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...
524500, 524507, 524726, 524760, 524770, 524840, 525123, 525127, 525440, 525454, 525455, 525457, 525528, 528 71, 528905, C08L 7506, C08G 1846
Patent
active
056376391
ABSTRACT:
A process for preparing poly(urethane/urea) prepolymers and aqueous poly(urethane/urea) dispersions (PUDs) therefrom, the poly(urethane/urea) polymers having high heat resistance and good water resistance. The method employs a water soluble volatile organic solvent, such as acetone, at a level of 0.1-5%, based on final dispersion weight, a level which does not require removal for purposes of flash point considerations. The method includes the steps of
reacting in the presence of a water soluble volatile organic solvent at a level corresponding to no more than 5% by weight of the final dispersion, a polyisocyanate component comprising a diisocyanate, with a polyol component to produce an isocyanate terminated polyurethane prepolymer the polyol component providing both carboxylate groups and sulfonate groups;
dispersing the isocyanate terminated prepolymer in aqueous media;
reacting said dispersed isocyanate terminated polyurethane prepolymer with at least one amine functional chain extender or chain terminator compound to thereby form said poly(urethane/urea) polymer;
neutralizing the carboxylate and sulfonate groups of said isocyanate terminated prepolymer with an alkali hydroxide or a tertiary amine prior to, or simultaneous with, said reaction of said prepolymer and said amine functional chain extender or terminator;
wherein the method is performed without a solvent distillation step.
REFERENCES:
patent: 4801644 (1989-01-01), Coogan
patent: 4870129 (1989-09-01), Henning et al.
patent: 5344873 (1994-09-01), Blum
patent: 5508340 (1996-04-01), Hart
patent: 5541251 (1996-07-01), Bontinck et al.
Duan Youlu
Stammler Sonja
H.B. Fuller Licensing and Financing, Inc.
Sergent Rabon
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