# US 5,254,263 A · Method of making sludge powder and sealant from paint sludge and sludge powder and sealant compositions produced thereby

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- Number: US 5,254,263 A
- Document ID: US5254263A
- Status: Granted
- Kind: A
- Application number: 07/921,559
- Filed: 1992-07-29
- Granted: 1993-10-19
- Earliest claimed: 1991-09-20
- Assignees: Aster Co., Ltd.
- Inventors: Michael J. Gerace; Sevilla C. Gamboa; Yasminka S. Landaburu
- Web page: https://patentgrep.com/patent/US5254263A

## CPC

- C08J 11/00: Recovery or working-up of waste materials (recovery of plastics B29B17/00; polymerisation processes involving purification or recycling of waste polymers or their depolymerisation products C08B, C08C, C08F, C08G, C08H)
- C09D 127/06: Homopolymers or copolymers of vinyl chloride
- C08L 2201/00: Properties
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

A sludge powder and sealant are prepared from paint sludge. A sludge powder is generated from a paint sludge having a volatiles content of 0-50% by weight by adding a processing filler thereto. A sealant composition is prepared by thereafter or concurrently therewith adding sealant ingredients including polymer, plasticizer, curative, and other sealant ingredients such as an adhesion promoter and sealant filler materials to the sludge powder. Alternatively, a sealant composition may be prepared by adding a paint sludge having a volatiles content of 0-50% by weight to the sealant ingredients, which may include a processing filler.

## Claims

### Claim 1

A method of preparing a sealant composition with a paint sludge containing water, solvent, and uncured polymer resin comprising:
generating a sludge powder containing uncured polymer by adding a processing filler to said paint sludge having a volatiles content of 0-50% by weight, and
combining with said sludge powder a polymer, plasticizer, curative, an adhesion promoter and sealant filler materials to form a sealant composition.

### Claim 2 (depends on 1)

The method of claim 1 wherein said processing filler is selected from the group consisting of calcium oxide, calcium sulfate, calcium chloride, magnesium sulfate, sodium sulfate, potassium carbonate, calcium carbonate, silica, clay, talc, hydrated alumina, wood flour, nut shells, poly soy, and cork.

### Claim 3 (depends on 2)

The method of claim 2 wherein said polymer is at least in part a polyvinyl chloride resin.

### Claim 4 (depends on 3)

A sealant composition produced by the method of claim 3.

### Claim 5 (depends on 1)

The method of claim 1 wherein said sludge powder is generated in-situ.

### Claim 6 (depends on 1)

The method of claim 1 wherein said sludge powder is first generated and, then, stored and later combined with said polymer, plasticizer, curative, and other sealant ingredients.

### Claim 7 (depends on 1)

A sealant composition produced by the method of claim 1.

### Claim 8

An in-situ method of preparing a sealant composition with a paint sludge containing water, solvent and uncured polymer resin comprising:
providing a paint sludge containing uncured polymer and having a volatiles content of 0-50% by weight, and
combining with said paint sludge a polymer, plasticizer, curative, an adhesion promotor and sealant filler material to form a sealant composition.

### Claim 9 (depends on 8)

The method of claim 8 wherein said polymer is at least in part a polyvinyl chloride resin.

### Claim 10 (depends on 10)

A sealant composition produced by the method of claim 10.

### Claim 11 (depends on 8)

The method of claim 8 wherein said paint sludge is a detackified paint sludge.

### Claim 12 (depends on 8)

The method of claim 8 wherein said paint sludge is a concentrated paint sludge.

### Claim 13 (depends on 8)

A sealant composition produced by the method of claim 8.