# US 4,396,389 A · Method of manufacturing a fabric having soil-release properties, particularly forming fabrics used in papermaking machines and cellulose machines, and filter cloths used in the papermaking and cellulose industries and related industries

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- Number: US 4,396,389 A
- Document ID: US4396389A
- Status: Granted
- Kind: A
- Application number: 06/351,157
- Filed: 1982-02-22
- Granted: 1983-08-02
- Earliest claimed: 1981-03-05
- Assignees: Nordiskafilt AB
- Inventors: Per A. Lofgren
- Web page: https://patentgrep.com/patent/US4396389A

## CPC

- D01F 6/92: of polyesters
- D01F 1/10: Other agents for modifying properties
- Y10S 162/903: Paper forming member, e.g. fourdrinier, sheet forming member
- Y10T 442/2025: Coating produced by extrusion
- Y10T 442/2279: Coating or impregnation improves soil repellency, soil release, or anti- soil redeposition qualities of fabric
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method of improving the soil-repellant properties of fabrics such as forming fabrics used in papermaking and cellulose machines, and filter cloths used in pa;permaking and cellulose industries and related industries. The improvement in accordance with the invention is obtained in that the synthetic material from which these fabrics are manufactured, is given improved hydrophilic properties, which in turn is achieved in that the synthetic starting material, prior to being extruded, is mixed with polymers which are made up of monomers having hydrolizable side groups. The fabric manufactured from the synthetic material is treated in a manner known per se with strong bases and or/acids to hydrolize the side groups.

## Claims

### Claim 1

In a method of manufacturing a fabric possessing soil-release properties which comprises; extruding threads from a material comprising synthetic polymeric resins; manufacturing a fabric from the extruded threads; and treating the fabric to obtain soil-release properties, the improvement comprising;
mixing the material with a polymer prior to extruding said material, said polymer being made up of monomers having hydrolyzable side groups, and in
treating said fabric manufactured from said thread applying a strong base and/or acid in order to hydrolyze said side groups.

### Claim 2 (depends on 1)

The improved method according to claim 1, wherein treating said fabric is by applying a strong base to hydrolyze said side groups.

### Claim 3 (depends on 1)

The improved method according to claim 1, wherein treating said fabric is by applying a strong acid to hydrolyze said side groups.

### Claim 4 (depends on 1)

The improved method according to claim 1, wherein said treatment of said fabric is by applying a combination of bases and acids.

### Claim 5 (depends on 1)

The improved method according to claim 1, wherein said polymer is mixed in amounts of up to 7% calculated on the weight of said material.

### Claim 6 (depends on 5)

The improved method according to claim 5, wherein said polymer is a polymethacrylate.

### Claim 7 (depends on 5)

The improved method according to claim 5, wherein said polymer is a polyacrylate.

### Claim 8 (depends on 5)

The improved method according to claim 5, wherein said polymer is polyvinyl acetate.

### Claim 9 (depends on 5)

The improved method according to claim 5, wherein said polymer is a copolymer made up of one or several of the monomers chosen from the group consisting of methacrylate, acrylate and vinylacetate.

### Claim 10 (depends on 1)

The improved method according to claim 1, wherein said material is a thermoplastic polyester.

### Claim 11 (depends on 10)

The improved method according to claim 10, wherein said thermoplastic polyester is polyethylene terephthalate.

### Claim 12 (depends on 10)

The improved method according to claim 10, wherein said thermoplastic polyester is polybutylene terephthalate.

### Claim 13 (depends on 1)

The improved method according to claim 1, wherein base is sodium hydroxide.

### Claim 14

In a forming fabric used in papermaking and cellulose machines, and in filter cloths used in the papermaking and cellulose industries and related industries, said fabric and cloths being made from a synthetic filament, the improvement comprising said synthetic filament being extruded from a mixture of polymers comprising polymers made up of monomers having hydrolizable side groups, which are hydrolized through treatment with strong bases.

### Claim 15

In a forming fabric used in papermaking and cellulose machines, and in filter cloths used in the papermaking and cellulose industries and related industries, said fabric and cloths being made from a synthetic filament, the improvement comprising said synthetic filament being extruded from a mixture of polymers comprising polymers made up of monomers having hydrolizable side groups, which are hydrolized through treatment with strong acids.