US Patent No: 5,223,034
Number of patents in Portfolio can not be more than 2000
Weather-resistant, pearlescent pigment and process for producing the same in the presence of hypophosphite
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Jun 29, 1993
Issued date -
May 1, 1991
filing date -
07/696,268
serial no -
In Force
status
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Abstract
The invention relates to a weather-resistant, pearlescent pigment which comprises mica flakes coated with a metal oxide as base material, (a) hydrated zirconium oxide formed by hydrolysis of a zirconyl compound in the presence of a hypophosphite, and (b) a hydrated metal oxide (or oxides) formed by hydrolysis of a water-soluble compound (or compounds) of at least one member selected from the group consisting of cobalt, manganese and cerium, said components (a) and (b) being deposited on the surface of said base material.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,565,581 Nacreous pigments having improved light fastness, their preparation and use | 20 | 1982 | |
| 4,482,389 Nacreous pigments | 16 | 1983 | |
| 5,022,923 Pearl luster pigments stable to glaze and enamel | 18 | 1986 | |
| 4,828,623 Water resistant nacreous pigment and process for producing the same | 18 | 1987 | |
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| 4,525,425 Water and oil repellent metal oxide-organic combination coating systems and method of making same | 19 | 1981 | |
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| 4,457,784 Green nacreous pigments having calcined Cr oxide and phosphate layer, their preparation, and use | 13 | 1982 | |