Anti-corrosive pigment and compositions formulated with such pigments
First Claim
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1. An anti-corrosive pigment comprising a polyvalent metal organophosphonate wherein the organophosphonate corresponds to phosphono carboxylic acid containing one or more acid groups and the ratio of polyvalent metal in said organophosphonate to acid group or groups in the corresponding phosphono carboxylic acid is greater than one on an equivalents basis.
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Abstract
Effective anti-corrosive pigments are obtained using basic or neutral to basic polyvalent metal organophosphonates. The anti-corrosive organophosphonate pigments may optionally contain a co-acidic substance such as silica. The organophosphonate pigments provide ant-corrosive protection comparable to traditional pigments while enabling the avoidance of heavy metals.
23 Citations
31 Claims
- 1. An anti-corrosive pigment comprising a polyvalent metal organophosphonate wherein the organophosphonate corresponds to phosphono carboxylic acid containing one or more acid groups and the ratio of polyvalent metal in said organophosphonate to acid group or groups in the corresponding phosphono carboxylic acid is greater than one on an equivalents basis.
- 18. An anti-corrosive primer or coating composition comprising a polyvalent metal organophosphioniate wherein the organophosphonate corresponds to phosphono carboxylic acid containing one or more acid groups and the ratio of polyvalent metal in said organophosphonate to acid group or groups in the corresponding phosphono carboxylic acid is greater than one on an equivalents basis.
- 21. An anti-corrosive primer or coating composition comprising, (a) polyvalent metal organophosphonate wherein the organophosphonate corresponds to phosphono carboxylic acid containing one or more acid groups and the ratio of polyvalent metal in said organophosphonate to acid groups in the corresponding phosphono carboxylic acid is greater than or equal to one on an equivalents basis, and (b) a member of a group consisting of an essentially water insoluble co-acid, a polyvalent metal salt of an essentially water insoluble co-acid or mixtures of said co-acid and polyvalent metal salt of said co-acid.
- 24. A process for preparing anti-corrosive pigments comprising (a) mixing an organophosphonic component selected from the group consisting phosphono carboxylic acid, phosphono carboxylic acid salt,and mixtures thereof, with water and at least one polyvalent metal compound to form a reaction mixture and (b) reacting said organophosphonic component and said polyvalent metal compound to form polyvalent metal organophosphonate.
Specification