Patent US4474909A successfully refreshed from Google Patents.
US4474909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opacification of paint
Assignee: DeSoto Inc
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Filing: 1982-12-09
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Granted: 1984-10-02
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Expires: 2002-12-09
Abstract
Abstract Aqueous flat paints are disclosed having improved hide at lowered titanium dioxide content in which the dispersed pigment is present in an amount providing a pigment volume concentration of from 60% to 80%, and in which the pigment contains from 5% to 25% of titanium dioxide, rutile, and the balance of the pigment consists essentially of pigmented vesiculated beads and opaque polymer particles in a ratio of 80/20 to 90/10. The small proportion of opaque polymer particles used minimizes the reduction in burnish and scrub resistance, but a large gain in hide is obtained.
Inventors
- 👤 Philip M. Smith
- 👤 Kenneth K. Hesler
- 👤 John R. Lofstrom
- 👤 Ursula A. Sikorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:25
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/02; C09D7/00; C09D7/40; C09D7/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
An aqueous flat paint having improved hide at lowered titanium dioxide content comprising, water, a resin binder, and pigment dispersed in the water, said pigment being present in an amount providing a pigment volume concentration of from 60% to 80%, said pigment containing from 5% to 25% of titanium dioxide, rutile, and the balance of the pigment consisting essentially of a mixture of pigmented vesiculated beads and opaque polymer particles in a ratio of from 30/70 to 90/10, said opaque polymer particles having a glass transition temperature high enough to avoid coalescence in the aqueous paint, an average particle size in the range of 0.1-2.5 microns and containing light-scattering microvoids which provide these particles with their opacity.
Claim 2
Dependent Claim
117 words
An aqueous flat paint having improved hide at lowered titanium dioxide content comprising, water, a resin binder, and pigment dispersed in the water, said pigment being present in an amount providing a pigment volume concentration of from 60% to 80%, said pigment containing from 5% to 25% of titanium dioxide, rutile, and the balance of the pigment consisting essentially of a mixture of pigmented vesiculated beads and opaque polymer particles in a ratio of from 30/70 to 90/10, said opaque polymer particles having a glass transition temperature high enough to avoid coalescence in the aqueous paint, an average particle size in the range of 0.1-2.5 microns and containing light-scattering microvoids which provide these particles with their opacity.
Claim 3
Dependent Claim
26 words
An aqueous paint as recited in claim 1 in which said binder is an emulsion copolymer suspended in the water with the aid of a surfactant.
Claim 4
Dependent Claim
24 words
An aqueous paint as recited in claim 1 in which the proportion of titanium dioxide, rutile, is from 5% to 15% of total pigment.
Claim 5
Dependent Claim
25 words
An aqueous latex paint as recited in claim 2 in which the proportion of titanium dioxide, rutile, is from 5% to 15% of total pigment.
Claim 6
Dependent Claim
18 words
An aqueous latex paint as recited in claim 4 in which said paint is an air drying paint.
Claim 7
Dependent Claim
39 words
An aqueous paint as recited in claim 1 in which said vesiculated beads have an average particle diameter of from 3 to 30 microns and contain from 10% to 60%, based on their dry weight, of finely divided pigment.
Claim 8
Dependent Claim
22 words
An aqueous paint as recited in claim 6 in which the finely divided pigment in said vesiculated beads is titanium dioxide, rutile.
Claim 9
Dependent Claim
21 words
An aqueous paint as recited in claim 1 in which the total pigmentation includes up to about 30% of extender particles.
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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |