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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Importance

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Abstract

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
MERCK PATENT GMBHDARMSTADT2833

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nitta, Katsuhisa Iwaki, JP 18 167
Suzuki, Isao Tama, JP 181 1156

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MERCK PATENT GMBH (4)
4,565,581 Nacreous pigments having improved light fastness, their preparation and use 22 1982
4,482,389 Nacreous pigments 19 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 19 1987
 
El-Chem Corporation (1)
4,525,425 Water and oil repellent metal oxide-organic combination coating systems and method of making same 19 1981
 
THOMAS JEFFERSON UNIVERSITY (1)
4,457,784 Green nacreous pigments having calcined Cr oxide and phosphate layer, their preparation, and use 16 1982

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
MERCK PATENT GMBH (6)
5,472,491 Pearlescent pigment for water-borne surface-coating systems 30 1994
6,176,918 Modified nacreous luster pigments for water paint systems 44 1998
7,160,374 Flaky pigments coated with a coupling agent and a perfluoroalkyl phosphate 2 2001
6,858,072 Surface-modified pearl pigment and process for producing the same 5 2002
7,241,503 Iridescent pigment having high brilliance and high chroma 9 2003
RE41858 Pearlescent pigment for water-borne surface-coating systems 0 2009
 
ENGELHARD CORPORATION (3)
5,759,255 Pearlescent pigment for exterior use 39 1997
5,951,750 Anti-yellowing polyolefin compositions containing pearlescent pigment to prevent yellowing and method therefore 5 1997
6,139,615 Pearlescent pigments containing ferrites 14 1998
 
NIPPON SHEET GLASS CO., LTD. (3)
8,273,171 Pearlescent pigment 0 2007
8,440,014 Bright pigment, and bright coating composition and automotive body coating each containing the same 0 2008
8,409,708 Bright pigment 0 2008
 
ECKART GMBH (1)
8,197,591 Pearlescent pigments having a secondary coating comprising α-silanes and method for the production thereof 1 2007
 
SHISEIDO COMPANY, LTD. (1)
7,022,409 Pleochroism powder and pleochroism printed article 0 2002