US4737194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium dioxide pigment coated with cerium cations, selected acid anions, and alumina
Assignee: EIDP Inc
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Filing: 1986-04-30
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Granted: 1988-04-12
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Expires: 2006-04-30
Abstract
Abstract A pigment consisting essentially of rutile TiO 2 particles coated with alumina or alumina-silica, and having particle surfaces associated with cerium cations and borate anions or water-soluble polyfunctional organic acid anions, is useful in coating compositions.
Inventors
- 👤 Howard W. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:52
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C09C1/3692; C09C3/00; C09C3/06; C09C3/063; C09C3/08; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
59 words
A pigment consisting essentially of rutile TiO 2 particles bearing coatings of alumina or alumina-silica, the particle surfaces having associated therewith 0.05-2%, by weight of the TiO 2 , of cerium cations and an associated quantity of borate anions or polyfunctional organic acid anions having a solubility in water of at least 10 grams per liter at 25° C.
Claim 2
Dependent Claim
59 words
A pigment consisting essentially of rutile TiO 2 particles bearing coatings of alumina or alumina-silica, the particle surfaces having associated therewith 0.05-2%, by weight of the TiO 2 , of cerium cations and an associated quantity of borate anions or polyfunctional organic acid anions having a solubility in water of at least 10 grams per liter at 25° C.
Claim 3
Dependent Claim
23 words
A pigment according to claim 1, wherein the alumina or alumina-silica coating constitutes 0.5-10% of the total weight of the TiO 2 particles.
Claim 4
Dependent Claim
23 words
A pigment according to claim 2, wherein the alumina or alumina-silica coating constitutes 1-6% of the total weight of the TiO 2 particles.
Claim 5
Dependent Claim
23 words
A pigment according to claim 3, wherein the alumina or alumina-silica coating constitutes 2-4% of the total weight of the TiO 2 particles.
Claim 6
Dependent Claim
13 words
A pigment according to claim 1, wherein the associated anions are borate ions.
Claim 7
Dependent Claim
30 words
A pigment according to claim 1, wherein the associated anions are polyfunctional organic acid anions having a solubility in water of at least 10 grams per liter at 25° C.
Claim 8
Dependent Claim
25 words
A pigment according to claim 1, wherein the associated anions are selected from the group consisting of citrate, succinate, fumarate, adipate, tartrate, and maleate ions.
Claim 9
Dependent Claim
13 words
A pigment according to claim 1, wherein the associated anions are citrate ions.
Claim 10
Dependent Claim
13 words
A pigment according to claim 2, wherein the associated anions are citrate ions.
Claim 11
Dependent Claim
13 words
A pigment according to claim 3, wherein the associated anions are citrate ions.
Claim 12
Dependent Claim
13 words
A pigment according to claim 4, wherein the associated anions are citrate ions.
Claim 13
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 1, a film-forming material, and a liquid carrier.
Claim 14
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 2, a film-forming material, and a liquid carrier.
Claim 15
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 3, a film-forming material, and a liquid carrier.
Claim 16
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 4, a film-forming material, and a liquid carrier.
Claim 17
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 5, a film-forming material, and a liquid carrier.
Claim 18
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 6, a film-forming material, and a liquid carrier.
Claim 19
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 7, a film-forming material, and a liquid carrier.
Claim 20
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 8, a film-forming material, and a liquid carrier.
Claim 21
Dependent Claim
17 words
A coating composition comprising a pigment according to claim 9, a film-forming material, and a liquid carrier.
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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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |