# US 5,348,579 A · Water resistant metal pigment-containing paste and method for making

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- Number: US 5,348,579 A
- Document ID: US5348579A
- Status: Granted
- Kind: A
- Application number: 08/104,550
- Filed: 1993-08-11
- Granted: 1994-09-20
- Earliest claimed: 1993-08-11
- Assignees: Silberline Manufacturing Co., Inc.
- Inventors: William G. Jenkins; Craig Keemer; H. Taylor Lamborn; Michael Curcio
- Web page: https://patentgrep.com/patent/US5348579A

## CPC

- C09D 5/38: Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
- C09D 17/006: {Metal}
- C01P 2004/20: extending in two dimensions, e.g. plate-like
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Metal pigment particles which are treated with a phosphosilicate compound show increased stability against attack by water. The particles are especially useful in aqueous coating compositions.

## Claims

### Claim 1

A metal pigment-containing paste suitable for formation of a coating composition, comprising:
metal pigment particles;
a solvent;
and at least one phosphosilicate compound
wherein the metal pigment particles comprise aluminum.

### Claim 2

A metal pigment-containing paste suitable for formation of a coating composition, comprising:
metal pigment particles;
a solvent;
and at least one phosphosilicate compound
wherein the metal pigment particles comprise bronze.

### Claim 3 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the metal pigment particles are present in an amount of from approximately 40% to approximately 90% by weight of the paste.

### Claim 4 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the phosphosilicate compound is present in an amount of from approximately 0.1% to approximately 30.0% by weight of the metal pigment particles.

### Claim 5 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the amount of phosphosilicate compound is approximately 10% by weight of the metal pigment particles.

### Claim 6 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the solvent comprises at least one member selected from the group consisting of mineral spirits, high flash naphtha, glycol ethers, glycol ether acetates, nitroparaffins, alcohols and acetates.

### Claim 7

A metal pigment-containing paste suitable for formation of a coating composition, comprising:
metal pigment particles;
a solvent;
and at least one phosphosilicate compound
wherein the metal pigment particles comprises at least one member selected from the group consisting of calcium strontium phosphosilicate, aluminum zirconium zinc phosphosilicate and calcium strontium zinc phosphosilicate.

### Claim 8 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the phosphosilicate compound comprises calcium strontium zinc phosphosilicate.

### Claim 9 (depends on 1)

The metal pigment-containing paste of claim 1, wherein the solvent further comprises a surface active agent.

### Claim 10 (depends on 1)

An aqueous coating composition comprising:
a metal pigment-containing paste as claimed in claim 1; and
an aqueous carrier.

### Claim 11

A method of making a metal pigment-containing paste useful for forming a coating composition, comprising:
(a) producing aluminum particles; and
(b) contacting the aluminum particles with a phosphosilicate compound.

### Claim 12 (depends on 11)

A coating composition comprising the metal pigment-containing paste made according to the method of claim 11.

### Claim 13

In a painted automobile, the improvement comprising paint containing aluminum particles which have been treated with a phosphosilicate compound.