Compositions – Preservative agents – Anti-corrosion
Patent
1995-08-17
1997-02-18
Gibson, Sharon
Compositions
Preservative agents
Anti-corrosion
252302, 2523635, 106400, 106404, 106453, B01J 1300, C09K 162, C04B 1400, C09C 134
Patent
active
056038658
ABSTRACT:
The present invention is directed to a pigment dispersant composition for use with inorganic pigments in coating compositions. The dispersant composition includes a vinyl or acrylic copolymer and a transition metal or rare earth metal salt. The metal salt in combination with the copolymer is useful with inorganic pigment as it lowers the viscosity of the pigment dispersions, thus allowing a higher concentration of pigment in the dispersion and consequently providing dispersions with higher non-volatile content and higher pigment to binder ratios. The presence of the metal salts in the dispersant composition when used with surface coated metal flake pigment provides excellent corrosion reduction of the metal pigment, indicated by the reduction or elimination of hydrogen gassing by the pigment in a coating composition.
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Arnott et al, Cationic-Film-Forming Inhibitors for the Protection of the AA 7075 Aluminum Alloy Against Corrosion in Aqueous Chloride Solution, Jan. 1989 pp. 12-18.
Bemer Lynne G.
Carpenter Clint G.
Czornij Zenon P.
DePue Jeffrey S.
Anthony Joseph D.
BASF Corporation
Gibson Sharon
Sabourin Anne Gerry
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