Claims
- 1. A process for preparing a flake inorganic pigment coated with zinc magnesium titanate defined by the following formula:Zn2−xMgx.yTiO4 (I) in whichx denotes a real number of 0.5 to 1.5; and y denotes an integer of 1 or 2 said process comprising the steps of dispersing a flake inorganic pigment in an aqueous phase, and dissolving water-soluble salts of titanium, zinc and magnesium in the aqueous phase according to the constitutional ratio given in the formula (I) and heating the resulting mixture to a temperature in the range of 40° C. to 80° C., titrating the mixture with an alkali, filtering the mixture, washing the mixture with water, drying the mixture, and sintering the mixture at a temperature in the range of from 700° C. to 1300° C.
- 2. The process of claim 1, wherein the flake inorganic pigment is one or more selected from the group consisting of talc, mica, sericite and kaolin, the water-soluble salt of titanium is one or more selected from the group consisting of titanium tetrachloride and titanium sulfate, the water-soluble salt of zinc is one or more selected from the group consisting of zinc chloride and zinc sulfate, and the water-soluble salt of magnesium is one or more selected from the group consisting of magnesium nitrate, magnesium chloride and magnesium sulfate.
- 3. The process of claim 1, wherein the water-soluble salts of titanium, zinc and magnesium are present in an amount ranging from 10 to 60 wt % with respect to the flake inorganic pigment as the base material.
- 4. The process of claim 2, wherein the water-soluble salts of titanium, zinc and magnesium are present in an amount ranging from 10 to 60 wt % with respect to the flake inorganic pigment as the base material.
- 5. The process of claim 1, wherein the titration is conducted by adjusting the pH value of the aqueous phase to a value in the range of 7-9.5 with an aqueous solution of at least one of sodium hydroxide, potassium hydroxide and ammonia.
- 6. The process of claim 1, wherein the powder obtained from said drying step is sintered for a time period within the range of from 1 to 10 hours.
Priority Claims (1)
Number |
Date |
Country |
Kind |
98-25563 |
Jun 1998 |
KR |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/KR99/00192 which has an International filing date of Apr. 23, 1999, which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/KR99/00192 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/00432 |
1/6/2000 |
WO |
A |
US Referenced Citations (9)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0340313 |
Nov 1989 |
EP |
63-265810 |
Nov 1988 |
JP |
08-3019 |
Jan 1996 |
JP |
1998-069339 |
Oct 1998 |
KR |
Non-Patent Literature Citations (2)
Entry |
Derwent information for KR 98069339, Oct. 26, 1998.* |
Database WPI on Questel, week 8122, London derwent Publications Ltd., AN 81-39713D, class E32, SU 763413 B (Sheubjnabb), abstract. |