Patent US3647495A successfully refreshed from Google Patents.
US3647495A
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Titanium dioxide pigment having improved dispersibility in coating compositions
Assignee: NL Chemicals Inc
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Filing: 1970-01-29
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Granted: 1972-03-07
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Expires: 1990-01-29
Abstract
Abstract A highly dispersible titanium dioxide pigment which may or may not be coated with a hydrous oxide such as alumina, titania or silica and mixtures thereof contains a coating of from 0.35 to 1.50 percent 2,2,4-trimethyl-1,3-pentanediol on pigment weight basis.
Inventors
- 👤 Charles W Cline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:59
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/36; C09C1/3692; C09C3/00; C09C3/006; C09C3/06; C09C3/063; C09C3/08; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
38 words
TiO2 pigment particles having a coating thereon of hydrous oxides selected from the group consisting of alumina, titania, silica and mixtures thereof and from 0.35 to 1.50 percent 2,2,4-trimethyl-1,3-pentanediol by weight of the pigment on the surface thereof.
Claim 2
Dependent Claim
16 words
TiO2 pigment particles according to claim 2 wherein the hydrous oxide coating comprises titania and alumina.
Claim 3
Dependent Claim
17 words
TiO2 pigment particles according to claim 2 wherein the hydrous oxide coating comprises titania, alumina and silica.
Claim 4
Dependent Claim
37 words
Process for preparing a diol treated titanium dioxide pigment comprising treating pigmentary titanium dioxide particles with from 0.35 to 1.50 percent 2,2,4-trimethyl-1,3-pentanediol and thereafter recovering titanium dioxide pigment particles having said diol retained on the surface thereof.
Claim 5
Dependent Claim
51 words
Process for preparing a diol-treated titanium dioxide pigment comprising coating pigmentary titanium dioxide with hydrous oxides selected from the group consisting of alumina, titania, silica and mixtures thereof and then treating the hydrous oxide coated titanium dioxide pigment with from 0.35 to 1.50 percent 2, 2,4-trimethyl-1,3-pentanediol by weight of the pigment.
References Cited (Backward Citations)
US3076719A
Cited
US3531310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |