Stable heavy metal free zircon pigments for use in plastics and paints and method for coloring thereof
US5316570A · kind A · utility
3Cited by
11References
3Claims
0Family size
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Inventor
Key dates
| Filing date | Sep 28, 1992 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Sep 28, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K9/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Stable zircon pigment particles, at least about 50 percent by volume of which range from about 0.2 to about 2.5.mu. in size, provide useful heavy metal free pigments for plastics and paints. A method for coloring plastic and paint materials without the use of heavy metal pigments comprises the step of adding to the material, in an amount of 0.5 to about 10 percent by weight, stable zircon pigment particles, at least about 50 percent by volume of which range from about 0.2 to about 2.5.mu. in size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.