US5858078A
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Platelet-shaped titanium dioxide pigment
Assignee: Merck Patent GmbH
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Filing: 1998-01-09
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Granted: 1999-01-12
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Expires: 2018-01-09
Abstract
Abstract Plateletlike, substrate-free titanium dioxide pigment obtainable by solidifying an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with further titanium dioxide by a wet method, and separating off, drying and calcining the material obtained.
Inventors
- 👤 Stefanie Andes
- 👤 Gerd Bauer
- 👤 Gunter Brenner
- 👤 Dieter Bruckner
- 👤 Andrea Heyland
- 👤 Matthias Kuntz
- 👤 Karl Osterried
- 👤 Gerhard Pfaff
- 👤 Michael Schmelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:19
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0018; A; A23; A23L; A23L5/00; A23L5/40; A23L5/42; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/29; A61Q; A61Q17/00; A61Q17/04; C09C1/0021; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/037; C09D5/00; C09D5/36; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/405; A61K2800/00; A61K2800/40; A61K2800/42; A61K2800/43; C01; C01P; C01P2004/00; C01P2004/20; C09C2200/00; C09C2200/10; C09C2200/1004; C09C2200/30; C09C2200/301; C09C2210/00; C09C2210/20; C09C2220/00; C09C2220/10; C09C2220/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
55 words
Platelet shaped, substrate-free titanium dioxide pigment obtainable by solidifying an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with further titanium dioxide by a wet method, and separating off, drying and calcining the material obtained.
Claim 2
Dependent Claim
55 words
Platelet shaped, substrate-free titanium dioxide pigment obtainable by solidifying an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with further titanium dioxide by a wet method, and separating off, drying and calcining the material obtained.
Claim 3
Dependent Claim
22 words
Titanium dioxide pigment according to claim 1, characterized in that the thermally hydrolysable titanium compound employed is an aqueous titanium tetrachloride solution.
Claim 4
Dependent Claim
109 words
Process for the preparation of the titanium dioxide pigment according to claim 1, characterized in that an aqueous solution of a thermally hydrolysable titanium compound is applied as a thin film to a continuous belt, the liquid film is solidified by drying, in the course of which the titanium dioxide is developed from the solution by means of a chemical reaction, the resulting layer is subsequently detached from the belt and washed, the titanium dioxide platelets obtained, with or without drying in between, are suspended in water and coated with further titanium dioxide, and the titanium dioxide platelets are separated off from the aqueous suspension, dried and, optionally, calcined.
Claim 5
Dependent Claim
25 words
The process according to claim 3, characterized in that the aqueous solution of a thermally hydrolysable titanium compound employed is an aqueous titanium tetrachloride solution.
Claim 6
Dependent Claim
28 words
Process according to claim 3, characterized in that the additional titanium dioxide is applied to the dried titanium dioxide platelets in a fluidized-bed reactor by means of CVD.
Claim 7
Dependent Claim
27 words
A method comprising incorporating the pigments according to claim 1 in paints, printing inks, plastics, cosmetics and glazes for ceramics and glass and in foodstuffs and sunscreens.
Claim 8
Dependent Claim
21 words
The method according to claim 6, characterized in that the pigments are employed in the form of a mixture of pigments.
Claim 9
Dependent Claim
16 words
Paint, printing ink, plastic, cosmetic, ceramic or glass pigmented with a pigment according to claim 1.
Claim 10
Dependent Claim
13 words
The pigment of claim 1, which has a layer thickness of 500 nm.
Claim 11
Dependent Claim
15 words
The pigment of claim 9, which has a layer thickness tolerance of less than 10%.
Claim 12
Dependent Claim
22 words
The pigment of claim 2, wherein the concentration of the titanium tetrachloride in the solution is from 7 to 30% by weight.
Claim 13
Dependent Claim
17 words
The pigment of claim 1, which is calcined at above 600° C. and is in rutile form.
Claim 14
Dependent Claim
15 words
The pigment of claim 1, which has a thickness of between 40 and 300 nm.
Claim 15
Dependent Claim
17 words
The process of claim 3, wherein the drying is conducted at temperatures between 30° and 200° C.
Claim 16
Dependent Claim
42 words
The process of claim 3, wherein the coating with further titanium dioxide is conducted by adding an aqueous titanium salt solution to a suspension of the titanium dioxide platelets heated to about 50°-100° C. and at a substantially constant pH of 0.5-5.
Claim 17
Dependent Claim
16 words
The method of claim 6, wherein 0.1 to 30% by weight of the pigment is incorporated.
References Cited (Backward Citations)
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