US4888383A
Expired / Lapsed
US
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Method for aqueous dispersion of polyurethane modified polyacrylics
Assignee: EIDP Inc
•
Filing: 1988-08-03
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Granted: 1989-12-19
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Expires: 2008-08-03
Abstract
Abstract A method for preparing a stable aqueous dispersion of polyurethane modified polyacrylic involving chain extension of polyacrylic with isocyanate and hydroxyl- or amino-functional groups.
Inventors
- 👤 Jozef T. Huybrechts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/62; C08G18/6291; C08G18/08; C08G18/0804; C08G18/0819; C08G18/0823; C08G18/10; C08G18/6216; C08G18/625; C08G18/6254; C08G18/6287
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A method of preparing a stable aqueous dispersion of polyurethane-urea modified polyacrylic comprising a. preparing a reaction mixture in the form of an aqueous dispersion or emulsion of primary amine-functional or hydrazide-functional polyacrylic, b. adding to the reaction mixture an isocyanate terminated prepolymer or a diisocyanate, and c. reacting the resultant mixture to cause chain extension to form a polyurethane-urea modified polyacrylics.
Claim 2
Independent Claim
62 words
A method of preparing a stable aqueous dispersion of polyurethane-urea modified polyacrylic comprising a. preparing a reaction mixture in the form of an aqueous dispersion or emulsion of primary amine-functional or hydrazide-functional polyacrylic, b. adding to the reaction mixture an isocyanate terminated prepolymer or a diisocyanate, and c. reacting the resultant mixture to cause chain extension to form a polyurethane-urea modified polyacrylics.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the ratio of polyurethane to polyacrylic is between 1/10 to 10/1.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the polyurethane prepolymer is a reaction product of n moles of difunctional polyol with n+1 moles of a difunctional diisocyanate.
Claim 5
Dependent Claim
38 words
The method of claim 3 wherein the polyurethane prepolymer contains an effective amount to stabilize the prepolymer in water of anionic salt groups or cationic salt groups or water soluble groups selected from polyethyleneoxide and polypropylene oxide copolymer.
Claim 6
Dependent Claim
35 words
The method of claim 3 wherein the polyurethane is based partly on a hydroxyl functional polyester, polyether or polybutadiene with a molecular weight between 500 and 3000 and an OH value between 35 and 230.
Claim 7
Dependent Claim
15 words
The method of claim 3 where the diisocyanates are of the aliphatic or cycloaliphatic type.
Claim 8
Dependent Claim
15 words
The method of claim 1 where the polyacrylic is based on an acrylic vinyl copolymer.
Claim 9
Dependent Claim
25 words
The method of claim 7 wherein the polyacrylic dispersion has an acid value between 30 and 150 and an amine value between 10 and 150.
Claim 10
Dependent Claim
25 words
The method of claim 8 where the polyacrylic has a hydroxyl value between 0 and 200 and a molecular weight average between 3000 and 150,000.
Claim 11
Dependent Claim
18 words
The method of claim 8 wherein the amine functionality is obtained through partial imination of the acid groups.
Claim 12
Dependent Claim
24 words
The method of claim 1 wherein the polyacrylic emulsion is formed through emulsion polymerization of acrylic-vinyl monomer blend using anionic, cationic or non-ionic surfactants.
Claim 13
Dependent Claim
25 words
The method of claim 11 wherein the polyolefin emulsion has an acid value between 0 and 150 and an amine value between 10 and 150.
Claim 14
Dependent Claim
33 words
The method of claim 12 wherein the amine functionality is obtained through imination of the acid groups or through reaction of an epoxy group with ammonia, or a mono- di- or polyfunctional amine.
Claim 15
Dependent Claim
27 words
The method of claim 11 wherein the emulsion has a hydrazide functionality obtained through reaction of a mono- or dihydroxide with a ketone or aldehyde functional monomer.
Claim 16
Dependent Claim
16 words
The method of claim 12 wherein the emulsion has a hydroxy value between 0 and 200.
Claim 17
Dependent Claim
40 words
The method of claim 11 wherein the emulsion contains 0.5-5% di- or polyfunctional monomers or 0.5-20% of a reactive monomer blend during the process of making the emulsion so that the formed emulsion is partly or completely insoluble in methylethylketone.
Claim 18
Dependent Claim
16 words
The method of claim 1 where the extension is done with an aliphatic or cycloaliphatic diisocyanate.
References Cited (Backward Citations)
US3624020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |