EP0035076A1
Expired / Lapsed
EP
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High dry hide TiO2 slurries
Assignee: Wyeth Holdings LLC
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Filing: 1980-03-03
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Granted: —
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Expires: 2000-03-03
Abstract
Abstract Satisfactory high dry hide titanium dioxide pigment slurries are prepared from undried, unmilled hydroclassified fines by the expedient of coating the fines with low amounts of aluminum oxide.
Inventors
- 👤 David Willson Blake
- 👤 Alberto Wolter Delgado
- 👤 Gerard Martin Sheehan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 00:29
CPC Classifications
C; C09; C09D; C09D17/00; C09D17/004; C09D17/007; C09D17/008; C09C; C09C1/00; C09C1/36; C09C1/3607; C09C1/3653; C09C1/3661; C01; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/22; C01P2006/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
In an aqueous titanium dioxide pigment slurry having high hiding power, a solids content of about 55 to 70 percent by weight, and an effective amount of a dispersing agent, the improvement comprising using undried, unmilled hydroclassified fines as the source of the titanium dioxide wherein said fines pass through a 325 mesh screen and are coated with about 0.3 to 3 percent by weight of hydrous aluminum oxide.
Claim 2
Dependent Claim
69 words
In an aqueous titanium dioxide pigment slurry having high hiding power, a solids content of about 55 to 70 percent by weight, and an effective amount of a dispersing agent, the improvement comprising using undried, unmilled hydroclassified fines as the source of the titanium dioxide wherein said fines pass through a 325 mesh screen and are coated with about 0.3 to 3 percent by weight of hydrous aluminum oxide.
Claim 3
Dependent Claim
23 words
The slurry of Claim 1, wherein up to about 60 percent of the fines is replaced by dried and milled titanium dioxide pigment.
Claim 4
Dependent Claim
19 words
The slurry of Claim 1 or Claim 2, wherein the fines are formed by the combustion of titaniferous salts.
Claim 5
Dependent Claim
33 words
The slurry of Claim 3, wherein the combustion of titaniferous salts is performed in the presence of aluminum chloride so as to burn in up to about 2 percent by weight aluminum oxide.
Claim 6
Dependent Claim
23 words
.5. The slurry of Claim 1 or Claim 2, wherein the fines are derived from the hydrolysis of a titanium iron sulfate solution.
Claim 7
Dependent Claim
32 words
The slurry of Claim 5, wherein the resultant hydrolysate is calcined in the presence of an aluminum salt so as to burn in up to about 2 percent by weight aluminum oxide.
Claim 8
Dependent Claim
18 words
The slurry of any preceding claim, wherein the solids content is about 60 to 65 percent by weight.
Claim 9
Dependent Claim
30 words
The slurry of any preceding claim, wherein the desired solids content has been obtained by concentration of a diluter slurry of the fines by filtration or evaporation of the water.
References Cited (Backward Citations)
US4097301A
Cited
US4170485A
Cited
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