Title:
METHODS FOR PRODUCING TITANIUM DIOXIDE HAVING IMPROVED GLOSS AT LOW TEMPERATURES
Document Type and Number:
WIPO Patent Application WO2001079358
Kind Code:
A3
Abstract:
The present invention provides methods of preparing a titanium dioxide pigment having improved gloss properties which involves heating an aqueous slurry of base titanium dioxide pigment to a temperature below about 75 DEG C, coating the base titanium dioxide pigment with a silica compound at a temperature below about 75 DEG C to form a silica coated titanium dioxide pigment; and coating the silica coated titanium dioxide pigment with an alumina compound at a temperature below about 75 DEG C to form the titanium dioxide pigment having improved gloss.
Inventors:
HIEW MICHAEL
WANG YARW-NAN
HAMOR LES
TEAR BRIAN
MCINTYRE ROBERT
WANG YARW-NAN
HAMOR LES
TEAR BRIAN
MCINTYRE ROBERT
Application Number:
PCT/US2001/011938
Publication Date:
March 28, 2002
Filing Date:
April 12, 2001
Export Citation:
Assignee:
MILLENNIUM INORGANIC CHEM (US)
International Classes:
C01G23/04; C09C1/36; C09C3/06; C09C3/08; C09D17/00; (IPC1-7): C09C1/36
Domestic Patent References:
| WO1989009801A1 | 1989-10-19 | |||
| WO1993022386A1 | 1993-11-11 | |||
| WO1996015197A1 | 1996-05-23 |
Foreign References:
| EP0073340A2 | 1983-03-09 | |||
| US3897261A | 1975-07-29 | |||
| FR1442117A | 1966-06-10 | |||
| GB1179171A | 1970-01-28 | |||
| GB2271765A | 1994-04-27 | |||
| DE1917363A1 | 1969-10-23 | |||
| US2913419A | 1959-11-17 |
Other References:
DATABASE WPI Section Ch Week 197743, Derwent World Patents Index; Class E32, AN 1977-76659Y, XP002186499
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