Patent US4801644A successfully refreshed from Google Patents.
US4801644A
Expired / Lapsed
US
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Coating compositions
Assignee: Syngenta Ltd
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Filing: 1986-10-03
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Granted: 1989-01-31
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Expires: 2006-10-03
Abstract
Abstract Aqueous polyurethane dispersions useful as coating compositions wherein the polyurethane comprises the reaction product of (a) an isocyanate-terminated polyurethane prepolymer containing carboxylic acid salt groups formed by reacting: (i) a polyisocyanate component containing at least 1% by weight of diphenylmethane-2,4'-diisocyanate, and (ii) an active hydrogen containing component containing a polyol and a carboxy group containing diol or triol, and (b) an active hydrogen containing chain extender.
Inventors
- 👤 Richard G. Coogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:08
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/7671; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0823; C08G18/10; C08G18/12; C08G18/7607
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
151 words
An aqueous polyurethane dispersion wherein the polyurethane comprises the reaction product of (a) an unblocked isocyanate-terminated polyurethane prepolymer containing carboxylic acid salt groups formed by reacting: (i) a polyisocyanate component containing at least 1% by weight of diphenylmethane-2,4'-diisocyanate, and (ii) an active hydrogen containing component containing at least one polyol having a molecular weight of from 62 to about 6000 and a carboxy group containing diol, in such proportions that the ratio of the number of isocyanate groups to the number of hydroxyl groups is in the range from about 1.1:1 to about 6:1, and (b) an active hydrogen containing chain extender selected from the group consisting of water, ammonia, a primary or secondary aliphatic, alicyclic, aromatic araliphatic or heterocyclic amine, hydrazine or a substituted hydrazine, the ratio of active hydrogens in the chain extender excluding water to isocyanate groups in the prepolymer being in the range from 1.0:1 to 1.75:1.
Claim 2
Dependent Claim
151 words
An aqueous polyurethane dispersion wherein the polyurethane comprises the reaction product of (a) an unblocked isocyanate-terminated polyurethane prepolymer containing carboxylic acid salt groups formed by reacting: (i) a polyisocyanate component containing at least 1% by weight of diphenylmethane-2,4'-diisocyanate, and (ii) an active hydrogen containing component containing at least one polyol having a molecular weight of from 62 to about 6000 and a carboxy group containing diol, in such proportions that the ratio of the number of isocyanate groups to the number of hydroxyl groups is in the range from about 1.1:1 to about 6:1, and (b) an active hydrogen containing chain extender selected from the group consisting of water, ammonia, a primary or secondary aliphatic, alicyclic, aromatic araliphatic or heterocyclic amine, hydrazine or a substituted hydrazine, the ratio of active hydrogens in the chain extender excluding water to isocyanate groups in the prepolymer being in the range from 1.0:1 to 1.75:1.
Claim 3
Dependent Claim
18 words
A dispersion according to claim 1 wherein the polyisocyanate component contains at least 5% by weight of diphenylmethane-2,4'-diisocyanate.
Claim 4
Dependent Claim
18 words
A dispersion according to claim 2 wherein the polyisocyanate component contains at least 10% by weight of diphenylmethane-2,4'-diisocyanate.
Claim 5
Dependent Claim
31 words
A dispersion according to claim 1 wherein the polyisocyanate component is a mixture of te 2,4'- and 4,4'-isomers of diphenylmethane diisocyanate containing from 5 to 70% by weight of the 2,4'-isomer.
Claim 6
Dependent Claim
47 words
A dispersion according to claim 1 wherein the polyisocyanate component comprises: (i) from 10 to 60% by weight of toluene diisocyanate, and (ii) from 90 to 40% by weight of a mixture of 4,4'- and 2,4'-diphenylmethane diisocyanates containing from 5 to 70% by weight of the 2,4'-isomer.
Claim 7
Dependent Claim
42 words
A dispersion according to claim 5 wherein the polyisocyanate component comprises from 30 to 50% by weight of toluene diisocyanate and from 70 to 50% by weight of a 4:4'-/2,4'-diphenylmethane diisocyanate mixture containing from 10 to 40% by weight of the 2,4'-isomer.
Claim 8
Dependent Claim
66 words
A dispersion according to claim 1 wherein the active hydrogen containing component comprises: (i) a polymeric diol having a molecular weight of from 500 to 6000, (ii) from 1 to 2 moles, per mole of polymeric diol, of a carboxy group containing diol and (iii) from 0 to 1 mole, per mole of polymeric diol, of a diol having a molecular weight from 62 to 300.
Claim 9
Dependent Claim
16 words
A dispersion according to claim 7 wherein the polymeric diol is a polyether or polyester diol.
Claim 10
Dependent Claim
15 words
A dispersion according to claim 8 wherein the polymeric diol is a polytetramethylene ether glycol.
Claim 11
Dependent Claim
15 words
A dispersion according to claim 7 wherein the carboxy group containing diol is 2,2-dimethylol-propionic acid.
Claim 12
Dependent Claim
20 words
A dispersion according to claim 7 wherein the diol having a molecular weight from 62 to 300 is cyclohexane dimethanol.
Claim 13
Dependent Claim
23 words
A dispersion according to claim 1 wherein the chain extender is selected from hydrazine, ethylene diamine, menthane diamine, 1,3-phenylene diamine and 1,4-phenylene diamine.
Claim 14
Dependent Claim
17 words
A coated article obtained by applying an aqueous polyurethane dispersion according to claim 1, to a substrate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |