US4046729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-reduced urethane coating compositions
Assignee: PPG Industries Inc
•
Filing: 1975-06-02
•
Granted: 1977-09-06
•
Expires: 1995-06-02
Abstract
Abstract A water-diluted, ungelled, non-sedimenting polyurethane and a process for preparing such a polyurethane in the presence of water is disclosed. The polyurethanes are prepared so that they contain a high percentage of highly active hydrogens which enable the polyurethanes to be further reacted with a curing agent to form thermoset products. The polyurethanes of the present invention are prepared by first dispersing a partially reacted NCO-containing polymer in water, which is then chain extended with a material such as an organic diamine. Thermosetting compositions are made by adding curing agent to the chain extended material. Curing agents can also be incorporated into the polymer molecule either in the making of the partially reacted NCO-containing prepolymer or by further reaction with the partially reacted NCO-containing prepolymer. The water-dispersed polyurethanes of the present invention are excellent film formers, capable of making coatings with a wide spectrum of desirable properties. In addition, they can be added to other water-compatible compositions to improve flexibility, hardness, drying and other coating properties.
Inventors
- 👤 Roger L. Scriven
- 👤 Wen-Hsuan Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:43
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/70; C08G18/72; C08G18/74; C08G18/75; C08G18/758; C08J2375/00; C08J2375/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31591
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
97 words
A stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of a non-gelled polyurethane formed by reacting in the presence of water: A. a partially reacted NCO-containing polymer containing salt groups and highly active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said partially reacted NCO-containing polymer having a reactive hydrogen equivalent weight of 150 to 10,000, B. an active hydrogen-containing compound having at least one hydrogen more reactive with NCO groups than water to form a polyurethane having an intrinsic viscosity of less than 4.0 deciliters per gram.
Claim 2
Dependent Claim
97 words
A stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of a non-gelled polyurethane formed by reacting in the presence of water: A. a partially reacted NCO-containing polymer containing salt groups and highly active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said partially reacted NCO-containing polymer having a reactive hydrogen equivalent weight of 150 to 10,000, B. an active hydrogen-containing compound having at least one hydrogen more reactive with NCO groups than water to form a polyurethane having an intrinsic viscosity of less than 4.0 deciliters per gram.
Claim 3
Dependent Claim
15 words
The aqueous dispersion of claim 1 in which the salt groups are acid salt groups.
Claim 4
Dependent Claim
15 words
The aqueous dispersion of claim 1 in which the salt groups are cationic in character.
Claim 5
Dependent Claim
16 words
The aqueous dispersion of claim 2 in which the salt groups are salts of carboxylic acids.
Claim 6
Dependent Claim
20 words
The aqueous dispersion of claim 3 in which the cationic salt groups are selected from the class consisting of ##STR12##
Claim 7
Dependent Claim
26 words
The aqueous dispersion of claim 1 in which the partially reacted NCO-containing polymer contains no more than 50 mole percent by weight of ethylene oxide moieties.
Claim 8
Dependent Claim
24 words
The aqueous dispersion of claim 1 in which the partially reacted NCO-containing polymer has an acid salt group equivalent weight of 150 to 20,000.
Claim 9
Dependent Claim
41 words
The aqueous dispersion of claim 2 in which the partially reacted NCO-containing polymer is dissolved in about 5 to 60 percent by weight organic solvent; the percentage by weight being based on total weight of solvent and partially reacted NCO-containing polymer.
Claim 10
Dependent Claim
27 words
The aqueous dispersion of claim 8 in which the organic solvent is water-soluble and at least part of the solvent has a boiling point above 150° C.
Claim 11
Dependent Claim
24 words
The aqueous dispersion of claim 8 in which the partially reacted NCO-containing polymer solution has a viscosity of from about 50 to 10,000 centipoises.
Claim 12
Dependent Claim
32 words
The aqueous dispersion of claim 1 in which the partially reacted NCO-containing polymer is the reaction product of an organic polyisocyanate and an organic compound having at least two active hydrogen atoms.
Claim 13
Dependent Claim
28 words
The aqueous dispersion of claim 11 in which the partially reacted NCO-containing polymer is the reaction product of an organic diisocyanate and an organic polyol or organic polyamine.
Claim 14
Dependent Claim
19 words
The aqueous dispersion of claim 12 in which the organic polyol contains at least in part a polyester polyol.
Claim 15
Dependent Claim
32 words
The aqueous dispersion of claim 11 in which the equivalent ratio of organic polyisocyanate to organic compound having at least two active hydrogen atoms is within the range of 7 to 0.5:1.
Claim 16
Dependent Claim
26 words
The aqueous dispersion of claim 1 in which the partially reacted NCO-containing polymer has a reactive hydrogen equivalent weight under the range of 150 to 8,000.
Claim 17
Dependent Claim
20 words
The aqueous dispersion of claim 1 in which the dispersed phase has a particle size of less than 5 microns.
Claim 18
Dependent Claim
33 words
The aqueous dispersion of claim 1 in which the NCO-containing polymer is reacted with a polyfunctional active hydrogen-containing compound having at least two hydrogens which are more reactive with NCO groups than water.
Claim 19
Dependent Claim
35 words
The aqueous dispersion of claim 17 in which the partially reacted NCO-containing polymer is reacted in said aqueous medium with a difunctional active hydrogen-containing compound having two hydrogens more reactive with NCO groups than water.
Claim 20
Dependent Claim
18 words
The aqueous dispersion of claim 1 in which the active hydrogen-containing compound is a primary or secondary polyamine.
Claim 21
Dependent Claim
13 words
The aqueous dispersion of claim 19 in which the polyamine is a diamine.
Claim 22
Dependent Claim
22 words
The aqueous dispersion of claim 1 in which the active hydrogen-containing compound is hydrazine, a substituted hydrazine or a hydrazine reaction product.
Claim 23
Dependent Claim
15 words
The aqueous dispersion of claim 19 in which the active hydrogen-containing compound is an alkanolamine.
Claim 24
Dependent Claim
29 words
The aqueous dispersion of claim 1 in which the equivalent ratio of active hydrogen-containing compounds to the partially reacted NCO-containing polymer is within the range of 0.5 to 2:1.
Claim 25
Dependent Claim
15 words
The aqueous dispersion of claim 1 in which the polyurethane contains unsaturated fatty acid moieties.
Claim 26
Dependent Claim
14 words
The aqueous dispersion of claim 1 which contains curing groups in the polymer molecule.
Claim 27
Dependent Claim
35 words
The aqueous dispersion of claim 25 in which the curing groups are selected from the class consisting of N-alkoxymethyl moieties, blocked isocyanate moieties, masked isocyanate moieties, alkoxysilane moieties, epoxy moieties and moieties containing ethylenic unsaturation.
Claim 28
Dependent Claim
21 words
The aqueous dispersion of claim 25 which is applied as a coating and treated with microwave with or without ultraviolet radiation.
Claim 29
Dependent Claim
105 words
An aqueous coating composition comprising: A. stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of an ungelled NCO-free polyurethane formed by reacting in the presence of water: 1. a partially reacted NCO-containing polymer containing salt groups and reactive active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said polymer having a reactive active hydrogen equivalent weight of 150 to 10,000, 2. an active hydrogen-containing compound having at least one hydrogen more reactive with NCO groups than water to form a polyurethane having an intrinsic viscosity of 2.0 deciliters per gram or less; B. a curing agent.
Claim 30
Dependent Claim
105 words
An aqueous coating composition comprising: A. stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of an ungelled NCO-free polyurethane formed by reacting in the presence of water: 1. a partially reacted NCO-containing polymer containing salt groups and reactive active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said polymer having a reactive active hydrogen equivalent weight of 150 to 10,000, 2. an active hydrogen-containing compound having at least one hydrogen more reactive with NCO groups than water to form a polyurethane having an intrinsic viscosity of 2.0 deciliters per gram or less; B. a curing agent.
Claim 31
Dependent Claim
24 words
The composition of claim 28 in which the curing agent is selected from the class consisting of aminoplasts, polyisocyanates, phenolic resins or epoxy-containing materials.
Claim 32
Dependent Claim
30 words
The composition of claim 28 in which the reactive active hydrogens are hydroxyl groups and the curing agent is selected from the class consisting of aminoplasts, polyisocyanates, or phenolic resins.
Claim 33
Dependent Claim
23 words
The composition of claim 28 in which the reactive active hydrogens are amino and curing agent is an epoxy-containing material or a polyisocyanate.
Claim 34
Dependent Claim
20 words
The composition of claim 28 which is applied as a coating and treated with microwave with or without ultraviolet radiation.
Claim 35
Dependent Claim
13 words
The composition of claim 28 which is applied as a coating by electrodeposition.
Claim 36
Dependent Claim
14 words
The composition of claim 28 which is applied as a coating by electrostatic spraying.
Claim 37
Independent Claim
131 words
A method of forming a stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of an ungelled polyurethane comprising: A. preparing a partially reacted NCO-containing polymer containing ionic salt groups or groups which are capable of forming ionic salt groups and highly active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said partially reacted NCO-containing polymer having a highly active hydrogen equivalent weight of 150 to 10,000, B. dispersing said partially reacted NCO-containing polymer in aqueous medium in which water is the principal ingredient, C. chain extending the NCO-containing polymer with an active hydrogen-containing compound having at least one hydrogen more reactive with the NCO groups than water to form a polyurethane having an intrinsic viscosity of 4.0 deciliters per gram or less.
Claim 38
Independent Claim
131 words
A method of forming a stable aqueous dispersion which is emulsifiable in the absence of added emulsifier of an ungelled polyurethane comprising: A. preparing a partially reacted NCO-containing polymer containing ionic salt groups or groups which are capable of forming ionic salt groups and highly active hydrogens selected from the group consisting of hydroxyl, thiol, primary and secondary amine, said partially reacted NCO-containing polymer having a highly active hydrogen equivalent weight of 150 to 10,000, B. dispersing said partially reacted NCO-containing polymer in aqueous medium in which water is the principal ingredient, C. chain extending the NCO-containing polymer with an active hydrogen-containing compound having at least one hydrogen more reactive with the NCO groups than water to form a polyurethane having an intrinsic viscosity of 4.0 deciliters per gram or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |