# US 4,391,745 A · Desizing agent and process for preparation thereof

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- Number: US 4,391,745 A
- Document ID: US4391745A
- Status: Granted
- Kind: A
- Application number: 06/283,816
- Filed: 1981-07-16
- Granted: 1983-07-05
- Earliest claimed: 1979-03-09
- Assignees: Diamalt Aktiengesellschaft
- Inventors: Maria Denkler; Frederic Braun
- Web page: https://patentgrep.com/patent/US4391745A

## CPC

- D06L 1/14: De-sizing
- D06L: DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS

## Abstract

This invention deals with the removal of starch and starch-containing substances from various fabrics and the like. This is accomplished by simultaneously using an admixture of starch decomposing enzymes and an appropriate surfactant.

## Claims

### Claim 1

A composition for removing starch and starch-containing sizing materials comprising an emulsion or dispersion of 10-40% of high temperature aqueous amylase enzyme effective as a desizing agent at about 100.degree. C. or higher, an anionic surfactant present in an amount of 0.5% and a non-ionic surfactant selected from the group consisting of alkyl oxalkylates, alkaryl oxalkylates and fatty acid ethyloxylates present 10-60% with the balance water.

### Claim 2 (depends on 1)

A composition as in claim 1, wherein the anionic surfactant is a paraffin sulfonate.

### Claim 3 (depends on 1)

A composition as in claim 1, wherein the non-ionic surfactant is an alkylphenol oxethylate.

### Claim 4 (depends on 1)

A composition as in claim 1, containing 0.5-20% paraffin sulfonate, 10-40% alkylphenol oxethylate, and 10-40% of the enzyme, the remainder being water.

### Claim 5 (depends on 1)

A composition as in claim 1, containing 1-10% paraffin sulfonate, 15-25% alkylphenol oxylate, 25-40% of the enzyme preparation, with the remainder being water.

### Claim 6 (depends on 1)

A composition as in claim 1, wherein the surfactant comprises essentially 5-15 parts of paraffin sulfonate sodium salt and 50-70 parts of alkylphenol oxethylate.

### Claim 7 (depends on 1)

A composition as in claim 1, wherein the components are emulsified with one another.

### Claim 8

A composition for removing starch and starch-containing sizing materials consisting essentially of an emulsion or dispersion of 10-40% of a starch-decomposing aqueous high temperature amylase enzyme, effective as a desizing agent at about 100.degree. C. or higher and 10-60% of a non-ionic surfactant selected from the group consisting of alkylphenol oxalkylate, oxalkylated fatty alcohols and fatty acid othyloxylate, with the balance water.