Aqueous resistant metal pigment-containing paste and method for

Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...

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Details

106403, 106419, 106431, C09C 162

Patent

active

056371438

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention is related to paste compositions containing metal pigment particles suitable for forming coating compositions, particularly aqueous coating systems. Increasingly stringent environmental regulations have required that coating systems dramatically reduce volatile organic solvent levels. One way to comply with such regulations is to use water in place of the volatile organic solvents previously used.


BACKGROUND OF THE INVENTION

Within this application several publications are referenced by arabic numerals within parentheses. Full citations for these references may be found at the end of the specification immediately preceding the claims. The disclosures of these publications in their entireties are hereby expressly incorporated by reference into this application.
In the area of coating systems utilizing metal pigment particles, aqueous systems present rather formidable difficulties. This is particularly true with respect to aluminum and zinc pigments. Thus, the metal pigment can readily react with water to generate hydrogen gas. The amount of gas generated can produce a safety hazard, creating high pressures within the composition containers. Also, the water reaction substantially diminishes the aesthetic value of metal pigments. The reaction of aluminum pigments with water can be depicted as follows:
Due to the increasing demand for aqueous systems, a number of techniques have been proposed for inhibiting the attack on the pigment particles by water. Unfortunately, most of these techniques have not provided sufficient protection.
One technique that provides inhibiting properties is the passivation of the metal pigment particles with an ionic organic phosphate as disclosed by Williams et al., U.S. Pat. No. 4,565,716, the disclosure of which is incorporated herein by reference. Another technique involves the use of compounds containing hexavalent chromium or pentavalent vanadium compounds as disclosed in Kondis U.S. Pat. No. 4,693,754, the disclosure of which is incorporated herein by reference. Other techniques include the use of organic phosphites as disclosed in Kondis et al. U.S. Pat. No. 4,808,231, the disclosure of which is incorporated herein by reference, or the use of nitroparaffin solvents. Still another technique includes the use of either (a) an ionic organic phosphate compound, for example as taught in Williams et al., U.S. Pat. No. 4,565,716, or (b) a pentavalent vanadium compound, for example as taught in Kondis, U.S. Pat. No. 4,693,754, or (c) an organic phosphite compound, for example as taught in Kondis et al. U.S. Pat. No. 4,808,231, in combination with a nitro-containing solvent such as a nitroparaffin as disclosed in Keemer et al., U.S. Pat. No. 5,215,579, the disclosure of which is incorporated herein by reference.
The treated metal pigment particles can be used to form a metal pigment paste. The treatment produces a metal pigment paste which has improved gassing stability over conventionally treated products.


SUMMARY OF THE INVENTION

The present invention is directed to metal particles which have been treated with (1) at least one heteropoly anion, (2) at least one phosphosilicate pigment or (3) a combination of at least one heteropoly anion and at least one phosphosilicate pigment. The metal particles, (e.g. aluminum flakes), which have been treated in this manner are stabilized to a degree suitable for use in aqueous coating systems.
A principle object of the invention is to provide a metal flake which can be used in aqueous systems and which is resistant to hydrogen evolution.
Another object of the invention is to provide a metal flake which maintains acceptable aesthetic values and intercoat and intracoat adhesion in the paint film.
Other objects, advantages and features of the present invention will be more readily appreciated and understood when considered in conjunction with the following detailed description.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

All the disclosed embodiments can be made using conventional compounds and pr

REFERENCES:
patent: 3423229 (1969-01-01), Kompanek et al.
patent: 4370382 (1983-01-01), Salensky
patent: 4693745 (1987-09-01), Kondis
patent: 4808231 (1989-02-01), Kondis et al.
patent: 4869754 (1989-09-01), Kawabe et al.
patent: 5215579 (1993-06-01), Keemer et al.
patent: 5296032 (1994-03-01), Jenkins et al.
patent: 5348579 (1994-09-01), Jenkins et al.
patent: 5356469 (1994-10-01), Jenkins et al.

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