# US 4,391,724 A · Controlled release laundry bleach product

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- Number: US 4,391,724 A
- Document ID: US4391724A
- Status: Granted
- Kind: A
- Application number: 06/313,422
- Filed: 1981-10-21
- Granted: 1983-07-05
- Earliest claimed: 1981-10-21
- Assignees: The Procter & Gamble Company
- Inventors: Dennis R. Bacon
- Web page: https://patentgrep.com/patent/US4391724A

## CPC

- C11D 3/3945: {Organic per-compounds (C11D3/3902 takes precedence)}
- C11D 17/044: {Solid compositions}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

A granular hydrophobic peroxyacid laundry product comprising a bleach plus a surfactant bleach release agent, contained inside a pouch, bag or substrate, provides a controlled bleach release laundry product for better bleaching in a laundry wash liquor.

## Claims

### Claim 1

A dry, granular laundry bleach product in a pouch comprising:
I. a hydrophobic peroxyacid bleach; and
II. an effective amount of a bleach release agent; said bleach and agent being contained within a closed water-insoluble but water-permeable pouch of fibrous material; said agent consisting of a surfactant selected from the group consisting of peroxyacid compatible synthetic detergents and short chain fatty acid soaps having carbon chain lengths of from about 8 to 14, whereby said agent increases the release of said peroxyacid bleach from said pouch into laundry wash liquor.

### Claim 2 (depends on 1)

The invention of claim 1 wherein said bleach release agent is present at a level of from about 5% to about 60% by weight of said peroxyacid bleach.

### Claim 3 (depends on 1)

The invention of claim 1 wherein said peroxyacid is selected from the group consisting of: peroxydecanoic acid, peroxydodecanoic acid, and peroxytetradecanoic acid.

### Claim 4 (depends on 2)

The invention of claim 2 wherein said bleach release agent is a surfactant selected from the group consisting of: sodium lauryl sulfate, sodium laurate, sodium paraffin sulfonate and linear alkyl benzene sulfonate.

### Claim 5 (depends on 1)

The invention of claim 1 wherein said pouch of fibrous material is: polyester fibers having a density of about 5-100 gm/m.sup.2 and wherein said pouch material has a pore size such that there is substantially no leakage of the granular bleach product.

### Claim 6 (depends on 5)

The invention of claim 5 wherein said density is about 40-65 gm/m.sup.2.

### Claim 7 (depends on 1, 2, 3, 4, 5, 6)

The invention of claim 1, 2, 3, 4, 5 or 6 wherein said bleach is peroxydodecanoic acid and said agent is sodium lauryl sulfate wherein said agent is present at a level of from about 5% to about 60% by weight of said bleach.

### Claim 8 (depends on 1, 2, 3, 4, 5, 6)

The invention of claim 1, 2, 3, 4, 5 or 6 wherein said bleach is peroxydodecanoic acid and said agent is sodium laurate wherein said agent is present at a level of from about 5% to about 60% by weight of said bleach.

### Claim 9 (depends on 1, 2, 3, 4, 5, 6)

The invention of claim 1, 2, 3, 4, 5 or 6 wherein the surfactant is present at a level of from about 15% to about 55% by weight of said bleach.

### Claim 10 (depends on 1, 2, 3, 4, 5, 6)

The invention of claim 1, 2, 3, 4, 5 or 6 wherein the surfactant is present at a level of from about 30% to about 50% by weight of said bleach.