Slow-curing water-curable urethane prepolymer composition
First Claim
1. A slow-curing water-curable urethane prepolymer composition obtained by reacting (A) a hydrophilic urethane prepolymer which is the reaction product of a polyisocyanate and a hydrophilic polyol prepolymer and has at least two free --NCO groups and (B) a blocking agent selected from a class consisting of heterocyclic compounds having an ##STR8## structure in the molecule thereof, hydroxypyridines and hydroxyquinolines in such a proportion that the equivalent ratio of the ═
- NH groups or the --OH groups in the blocking agent (B) to the --NCO groups in the hydrophilic urethane prepolymer (A) (═
NH or --OH/--NCO) is 0.05 to 2.
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Accused Products
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 ═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 ═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.
57 Citations
15 Claims
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1. A slow-curing water-curable urethane prepolymer composition obtained by reacting (A) a hydrophilic urethane prepolymer which is the reaction product of a polyisocyanate and a hydrophilic polyol prepolymer and has at least two free --NCO groups and (B) a blocking agent selected from a class consisting of heterocyclic compounds having an ##STR8## structure in the molecule thereof, hydroxypyridines and hydroxyquinolines in such a proportion that the equivalent ratio of the ═
- NH groups or the --OH groups in the blocking agent (B) to the --NCO groups in the hydrophilic urethane prepolymer (A) (═
NH or --OH/--NCO) is 0.05 to 2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- NH groups or the --OH groups in the blocking agent (B) to the --NCO groups in the hydrophilic urethane prepolymer (A) (═
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12. An improved aqueous resin emulsion composition, which contains a slow-curing water-curable urethane prepolymer composition obtained by reacting (A) a hydrophilic urethane prepolymer composition which is a reaction product of a polyisocyanate and a hydrophilic polyol prepolymer and has at least 2 free --NCO groups and (B) a blocking agent selected from a class consisting of heterocyclic compounds having an ##STR13## structure in the molecule thereof, hydroxypyridines, and hydroxyquinolines, in such a proportion that the equivalent ratio of the ═
- NH groups or --OH groups of the component (B) to the --NCO groups of the component (A) is 0.05-2, in an amount of 0.05-10 parts by weight per 100 parts of the solid ingredient content of said emulsion.
- View Dependent Claims (13, 14, 15)
Specification