US4170485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium dioxide slurries from recycle material
Assignee: KEMIRA Inc A GA CORP
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Filing: 1978-08-22
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Granted: 1979-10-09
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Expires: 1998-08-22
Abstract
Abstract {PG,1 High gloss titanium dioxide pigment slurries are prepared by using the underflow from the thickener, optionally treated with aluminum oxide, plus an organic dispersant, plus optionally a polyol.
Inventors
- 👤 David W. Blake
- 👤 Gerard M. Sheehan
- 👤 John D. Rowland
- 👤 George L. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A high gloss titanium dioxide slurry comprising: 60-80% by weight thickener underflow material as the titanium dioxide, the underflow being the bottom product out of a milling step in which the particles are considered too fine to be packed as a dry pigment; 0.3-2% by weight organic polyelectrolyte dispersant; and the balance is water.
Claim 2
Dependent Claim
54 words
A high gloss titanium dioxide slurry comprising: 60-80% by weight thickener underflow material as the titanium dioxide, the underflow being the bottom product out of a milling step in which the particles are considered too fine to be packed as a dry pigment; 0.3-2% by weight organic polyelectrolyte dispersant; and the balance is water.
Claim 3
Dependent Claim
27 words
The slurry of claim 1 wherein the thickener underflow has added thereto about 0.2-0.75% by weight, based on the dry weight of titanium dioxide, of aluminum oxide.
Claim 4
Dependent Claim
31 words
The slurry of claim 1 further containing up to about 2% by weight of a polyol of the formula R(CH.sub.2 OH).sub.3 wherein R is an alkyl group having 1-10 carbon atoms.
Claim 5
Dependent Claim
10 words
The slurry of claim 3 wherein the polyol is trimethylolethane.
Claim 6
Dependent Claim
64 words
In a high gloss titanium dioxide slurry comprising 60-80% by weight titanium dioxide, 0.3-2% by weight organic polyelectrolyte dispersant, and the balance water, the improvement comprising thickener underflow material as at least about 50% of the titanium dioxide, the underflow being the bottom product out of a milling step in which the particles are considered too fine to be packed as a dry pigment.
Claim 7
Dependent Claim
64 words
In a high gloss titanium dioxide slurry comprising 60-80% by weight titanium dioxide, 0.3-2% by weight organic polyelectrolyte dispersant, and the balance water, the improvement comprising thickener underflow material as at least about 50% of the titanium dioxide, the underflow being the bottom product out of a milling step in which the particles are considered too fine to be packed as a dry pigment.
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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) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |