# US 4,381,247 A · Enzyme-containing bleaching composition

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- Number: US 4,381,247 A
- Document ID: US4381247A
- Status: Granted
- Kind: A
- Application number: 06/313,129
- Filed: 1981-10-20
- Granted: 1983-04-26
- Earliest claimed: 1980-10-24
- Assignees: Kao Soap Co., Ltd.
- Inventors: Yunosuke Nakagawa; Shoichiro Aramatsu
- Web page: https://patentgrep.com/patent/US4381247A

## CPC

- C11D 3/38636: {containing enzymes other than protease, amylase, lipase, cellulase, oxidase or reductase}
- C01B 15/106: {Stabilisation of the solid compounds, subsequent to the preparation or to the crystallisation, by additives or by coating}
- C11D 3/38609: {Protease or amylase in solid compositions only}
- C11D 3/38672: {Granulated or coated enzymes}
- D06L 4/12: combined with specific additives
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- D06L: DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS

## Abstract

An enzyme-containing bleaching composition is disclosed containing an inorganic peroxide, an enzyme, and one or more anhydrous salts selected from the group consisting of anhydrous sodium citrate, anhydrous magnesium sulfate, anhydrous calcium chloride and anhydrous zinc sulfate.

## Claims

### Claim 1

A dry, powder, enzyme-containing, bleaching composition comprising from 5 to 98 percent by weight of an inorganic peroxide effective for bleaching fabrics; from 0.01 to 5 percent by weight of one or more enzymes capable of functioning in a bleaching composition for the removal of organic stains from fabrics; and from 0.1 to 20 percent by weight of at least one anhydrous salt selected from the group consisting of anhydrous sodium citrate, anhydrous magnesium sulfate, anhydrous calcium chloride and anhydrous zinc sulfate.

### Claim 2 (depends on 1)

A dry, powder, enzyme-containing, bleaching composition according to claim 1 wherein the enzymes are selected from the group consisting of hydrolase, transferase, oxide-reductase, lyase, isomerase, ligase, protease, lipase, cellulase and amylase.

### Claim 3 (depends on 1)

A dry, powder, enzyme-containing, bleaching composition according to claim 1 wherein the enzymes have an optimum temperature in the range of 10.degree.-80.degree. C. and an optimum pH in the range of 4-12.

### Claim 4 (depends on 1)

A dry, powder, enzyme-containing, bleaching composition according to claim 1 wherein the inorganic peroxide has a water content of less than 2 wt. %.

### Claim 5 (depends on 4)

A dry, powder, enzyme-containing, bleaching composition according to claim 4 wherein the enzymes are in the form of granules having a particle size 0.1-2.0 mm.

### Claim 6 (depends on 1)

A dry, powder, enzyme-containing, bleaching composition according to claim 1, consisting essentially of from 20 to 85 percent by weight of said inorganic peroxide, from 0.1 to 5 percent by weight of said enzyme and from 0.5 to 15 percent by weight of said anhydrous salt.

### Claim 7 (depends on 6)

A dry, powder, enzyme-containing, bleaching composition according to claim 6 in which said enzyme is selected from the group consisting of protease, lipase, cellulase, amylase and mixtures thereof.