US4783502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable nonaqueous polyurethane microparticle dispersion
Assignee: PPG Industries Ohio Inc
•
Filing: 1987-12-03
•
Granted: 1988-11-08
•
Expires: 2007-12-03
Abstract
Abstract A stable, nonaqueous polyurethane microparticle dispersion is characterized in that less than 20 percent of the polymer microparticles have a mean diameter greater than 5 microns, further characterized in that at a total solids content of 60 percent the Brookfield viscosity is less than 1000 centipoise measured at 50 RPM using a number 3 spindle at 25° C., the polyurethane being prepared from reactants which are substantially free of acrylic polymer and the polyurethane being further characterized in that it is substantially free of unreacted polyisocyanate monomer.
Inventors
- 👤 Dennis L. Faler
- 👤 Gregory J. McCollum
- 👤 James B. O'Dwyer
- 👤 Marvis E. Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:40
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0861; C08G18/0871
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
87 words
A stable, nonaqueous polyurethane microparticle dispersion is characterized in that less than 20 percent of the polymer microparticles have a mean diameter greater than 5 microns, further characterized in that at a total solids content of 60 percent the Brookfield viscosity is less than 1000 centipoise measured at 50 RPM using a number 3 spindle at 25° C., the polyurethane being prepared from reactants which are substantially free of acrylic polymer and the polyurethane being further characterized in that it is substantially free of unreacted polyisocyanate monomer.
Claim 2
Dependent Claim
87 words
A stable, nonaqueous polyurethane microparticle dispersion is characterized in that less than 20 percent of the polymer microparticles have a mean diameter greater than 5 microns, further characterized in that at a total solids content of 60 percent the Brookfield viscosity is less than 1000 centipoise measured at 50 RPM using a number 3 spindle at 25° C., the polyurethane being prepared from reactants which are substantially free of acrylic polymer and the polyurethane being further characterized in that it is substantially free of unreacted polyisocyanate monomer.
Claim 3
Dependent Claim
23 words
The microparticle dispersion of claim 1 wherein less than 20 percent of the polymer microparticles have a mean diameter greater than 1 micron.
Claim 4
Dependent Claim
23 words
The microparticle dispersion of claim 1 wherein the mean diameter of the polymer microparticles ranges from about 0.05 micron to about 0.5 micron.
Claim 5
Dependent Claim
20 words
The microparticle dispersion of claim 1 wherein the polyurethane is prepared from an active hydrogen containing material and a polyisocyanate.
Claim 6
Dependent Claim
20 words
The dispersion of claim 4 wherein the active hydrogen containing material is selected from polyols, amines, and acid functional materials.
Claim 7
Dependent Claim
19 words
The dispersion of claim 4 wherein the polyurethane contains groups selected from ethylenic unsaturation, hydroxyl, epoxy, carboxyl and amino.
Claim 8
Dependent Claim
24 words
The dispersion of claim 1 wherein the polyurethane polymer is contained within each microparticle and the nonaqueous medium is substantially free of dissolved polymer.
Claim 9
Dependent Claim
18 words
The dispersion of claim 7 wherein the nonaqueous medium contains no more than 30 percent of dissolved polymer.
Claim 10
Dependent Claim
18 words
The dispersion of claim 8 wherein the nonaqueous medium contains no more than 15 percent of dissolved polymer.
Claim 11
Dependent Claim
21 words
The dispersion of claim 5 wherein the polyol is selected from the group of polyester polyols, polyether polyols, and polyurethane polyols.
Claim 12
Dependent Claim
32 words
The dispersion of claim 1 wherein the reactants contain no more than about 30 percent by weight of acrylic polymer based on the total weight of the reactants of the polyurethane polymer.
Claim 13
Dependent Claim
20 words
The dispersion of claim 11 wherein the reactants contain no more than about 20 percent by weight of acrylic polymer.
Claim 14
Dependent Claim
20 words
The dispersion of claim 12 wherein the reactants contain no more than about 10 percent by weight of acrylic polymer.
Claim 15
Dependent Claim
11 words
The dispersion of claim 1 wherein the polymer microparticles are crosslinked.
Claim 16
Dependent Claim
11 words
The dispersion of claim 1 wherein the polymer microparticles are uncrosslinked.
Claim 17
Dependent Claim
15 words
The dispersion of claim 1 wherein the polyurethane polymer is essentially free of isocyanate groups
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |