Patent US3942999A successfully refreshed from Google Patents.
US3942999A
Expired / Lapsed
US
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Pigments
Assignee: British Titan Ltd
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Filing: 1974-08-15
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Granted: 1976-03-09
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Expires: 1994-08-15
Abstract
Abstract Titanium dioxide pigments carrying diisopropanolamine have good dispersibility, minimum tendency to foaming, minimum retardation of drying time and develop high opacity without the requirement for the presence of water. Preferably, the pigments also carry one or more hydrous metal oxides, a phosphate and/or a silicate. The preferred method of manufacture of the pigmentary titanium dioxide is to dry mill the pigment in the presence of the diisopropanolamine.
Inventors
- 👤 John James Hinley
- 👤 David Malcolm Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:25
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: 21
Claim 1
Independent Claim
26 words
A pigmentary titanium dioxide the particles of which carry diisopropanolamine in an amount of from 0.05 to 2% by weight based on the weight of pigment.
Claim 2
Dependent Claim
26 words
A pigmentary titanium dioxide the particles of which carry diisopropanolamine in an amount of from 0.05 to 2% by weight based on the weight of pigment.
Claim 3
Dependent Claim
38 words
A pigmentary titanium dioxide as claimed in claim 1 which the particles also carry one or more hydrous metal oxides in an amount of from 0.5 to 25% (as oxide) by weight based on the weight of pigment.
Claim 4
Dependent Claim
21 words
Pigmentary titanium dioxide according to claim 1 which the amount of diisopropanolamine is from 0.1% to 0.6% by weight of pigment.
Claim 5
Dependent Claim
24 words
Pigmentary titanium oxide according to claim 1 in which the particles also carry one or more hydrous metal oxides, a phosphate or a silicate.
Claim 6
Dependent Claim
26 words
Pigmentary titanium dioxide according to claim 2 in which the hydrous oxide is present in an amount of from 0.5 to 6% (as oxide) by weight.
Claim 7
Dependent Claim
30 words
Pigmentary titanium oxide according to claim 4 in which the hydrous oxide is selected from the group consisting of a hydrous oxide of titanium, aluminium, cerium, silicon, zirconium and zinc.
Claim 8
Dependent Claim
52 words
Pigmentary titanium dioxide according to claim 4 in which the particles carry a hydrous oxide of silicon in an amount of from 9 to 15% SiO 2 and a hydrous oxide of aluminum in an amount of 2 to 7% as Al 2 O 3 both based on the weight of pigment.
Claim 9
Dependent Claim
28 words
Pigmentary titanium dioxide according to claim 1 in which the particles also carry a non-hydrous metal oxide selected from the class of oxides of aluminium, titanium and silicon.
Claim 10
Dependent Claim
37 words
A process for the treatment of pigmentary titanium dioxide comprising mixing pigmentary titanium oxide with diisopropanolamine in an amount such that the dry pigment carries 0.05 to 2% by weight diisopropanolamine based on the weight of pigment.
Claim 11
Dependent Claim
37 words
A process for the treatment of pigmentary titanium dioxide comprising mixing pigmentary titanium oxide with diisopropanolamine in an amount such that the dry pigment carries 0.05 to 2% by weight diisopropanolamine based on the weight of pigment.
Claim 12
Dependent Claim
17 words
The process of claim 9 wherein said pigmentary titanium dioxide is wet milled before treating with diisopropanolamine.
Claim 13
Dependent Claim
26 words
A process according to claim 9 in which the pigmentary titanium dioxide is treated with the diisopropanolamine during the fluid energy mill stage of pigment preparation.
Claim 14
Dependent Claim
26 words
A process according to claim 10 in which the pigmentary titanium dioxide is treated with the diisopropanolamine during the fluid energy mill stage of pigment preparation.
Claim 15
Dependent Claim
24 words
A process according to claim 11 in which the diisopropanolamine is added to the pigmentary titanium dioxide prior to entering the fluid energy mill.
Claim 16
Dependent Claim
21 words
A process according to claim 13 in which the diisopropanolamine is in solid form when added to the pigmentary titanium dioxide.
Claim 17
Dependent Claim
19 words
A process according to claim 13 in which the diisopropanolamine is molten when added to the pigmentary titanium dioxide.
Claim 18
Dependent Claim
23 words
A process according to claim 13 in which the diisopropanolamine is dissolved in a solvent therefore when added to the pigmentary titanium dioxide.
Claim 19
Dependent Claim
14 words
A process according to claim 16 in which the diisopropanolamine is dissolved in water.
Claim 20
Dependent Claim
20 words
A process according to claim 16 in which the solution contains from 50 to 90% by weight of the diisopropanolamine.
Claim 21
Dependent Claim
31 words
A process according to claim 11 in which the pigmentary titanium dioxide is fluid energy milled twice and the diisopropanolamine is added immediately prior to the first fluid energy milling stage.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |