Welcome Guest to Coatings World    Login || Register
Last Updated Wednesday, November 26 2014
Print

Eckart patents aluminum effect pigments



Published August 15, 2011
Related Searches: Color
Patent No. U.S. 7,828,890 B2
Eckart has been granted a patent for effect pigments having an aluminum core or aluminum alloy core and an aluminum oxide-containing or aluminum oxide/hydroxide-containing layer enveloping the aluminum core or aluminum alloy core, obtained by chemical wet-process oxidation of lamellar aluminum pigments or aluminum alloy pigments, the content of metallic aluminum in the aluminum core or aluminum alloy core being not more than 90% by weight, based on the total weight of the pigment, characterized in that the oxidized aluminum pigments or aluminum alloy pigments exhibit at least one highly refractive metal chalcogenide layer having a refractive index of >1.95, the at least one metal chalcogenide layer being a layer of an intrinsically colored metal chalcogenide, and a mixed layer is formed between the highly refractive metal chalcogenide layer and the enveloping aluminum oxide-containing or aluminum oxide/hydroxide-containing layer, wherein the aluminum oxide-containing or aluminum oxide/hydroxide containing enveloping layer has a thickness of from 50-300 nm and wherein the effect pigments have a weak color flop having a ΔH*anchor in a range of between 1.5 and 50, and wherein the refractive index of the mixed layer between the aluminum oxide-containing or aluminum oxide/hydroxide-containing layer and the highly refractive metal chalcogenide layer exhibits a gradient perpendicularly to the pigment surface extending from the refractive index of the pure aluminum oxide/hydroxide-containing layer and the refractive index of the highly refractive metal chalcogenide layer.


blog comments powered by Disqus
Receive free Coatings World emails
Sign up now to receive the weekly newsletter, and more!

Enter your email address:
Company Spotlight
Shamrock Technologies, Inc.
Foot of Pacific Street
Newark, NJ, 07114
USA
View Profile
BASF Corporation
100 Campus Drive
Florham Park, NJ, 07932
US
View Profile
Lubrizol Advanced Materials, Inc.
9911 Brecksville Road
Cleveland, OH, 44141
US
View Profile
Keeneyes
18F, No.85, Sec. 1, Chung-Shiao E. Rd.
Taipei, Taiwan, 100
R.O.C.
View Profile
Micro Powders, Inc.
580 White Plains Rd.
Tarrytown, NY, 10591
US
View Profile
AZ Electronic Materials Co., Ltd.
No. 458-6, Sinsing Road Hu Kou Township Hsinchu Country 303, Taiwan
Hsinchu Country, Taiwan, 303
Taiwan
View Profile
Siltech Corporation
225 Wicksteed Avenue
Toronto, ON, M4H 1G5
Canada
View Profile
Sunin Machine Co., Ltd.
No.96, Chiao Ho Rd ,Chungho Dist
New Taipei City, Taiwan , 235
Taiwan Roc
View Profile
Houchi Chemical Co., Ltd
No.56, Fu Chow Street
Taipei, Taipei, 100
Taiwan
View Profile
Follow Coatings World On