Pigment dispersion composition

Details Pigment dispersion composition Pigment dispersion composition

1995-05-26

1996-12-17

Hoke, Veronica P.

Stock material or miscellaneous articles

Composite

Of metal

106412, 106500, 427528, 428463, 524 88, 524376, 524389, 524786, B32B 1508, B32B 2700, C09B 6750, C23C 1414, C08K 547

Patent

active

055851894

ABSTRACT:
The present invention discloses a pigment dispersion composition for depositing a multiplicity of pores existing in anodic oxide films formed on a surface of an aluminum or aluminum alloy material by way of electrophoresis for coloration, the pores being preliminarily enlarged to have a diameter of 50 nm to 250 nm. The pigment dispersion composition comprises water, a pigment dispersant and a pigment. The pigment dispersed in the pigment dispersion composition has a median particle size of not greater than 250 nm in a particle-size distribution thereof with not greater than 30% of the pigment particles being impassable through a sieve having a mesh size of 300 nm. The pigment dispersion composition is useful for coloration of the anodic oxide films, and has excellent repeated-coloration characteristics.

REFERENCES:
patent: 3844908 (1974-10-01), Matsuo et al.
patent: 4371643 (1983-02-01), Thomas
patent: 4478968 (1984-10-01), Jaffe
patent: 5334297 (1994-08-01), Nakada et al.
patent: 5416135 (1995-05-01), Endres et al.

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