# US 4,391,723 A · Controlled release laundry bleach product

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- Number: US 4,391,723 A
- Document ID: US4391723A
- Status: Granted
- Kind: A
- Application number: 06/282,562
- Filed: 1981-07-13
- Granted: 1983-07-05
- Earliest claimed: 1981-07-13
- Assignees: The Procter & Gamble Company
- Inventors: Dennis R. Bacon; Frank P. Bossu
- Web page: https://patentgrep.com/patent/US4391723A

## CPC

- C11D 17/046: {Insoluble free body dispenser}
- C11D 3/3945: {Organic per-compounds (C11D3/3902 takes precedence)}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

A hydrophilic or hydrotropic peroxyacid laundry bleach plus a surfactant bleach release-delaying agent, contained inside a pouch, bag or substrate, provides a controlled bleach release laundry product.

## Claims

### Claim 1

A dry, granular laundry bleach product in a pouch comprising:
I. a peroxyacid bleach selected from the group consisting of hydrotropic acid hydrophilic peroxyacid bleaches,
II. an effective amount of a bleach release-delaying 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 delays 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-delaying agent is present at a level of at least about 10% 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: diperoxyphthalic, 1,12-diperoxydodecanedioic, 1,11-diperoxyundecanedioic, diperoxyazelaic, diperoxyadipic, and perbenzoic acids.

### Claim 4 (depends on 2)

The invention of claim 2 wherein said bleach release-delaying agent is a surfactant selected from the group consisting of: sodium lauryl sulfate, sodium laurate, ethoxylated tallow alcohol 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)

The invention of claim 1, 2, 3, 4, 5, or 6 wherein said bleach is 1,12-diperoxydodecanedioic acid and said agent is sodium lauryl sulfate wherein said agent is present at a level of from about 10% to about 60% by weight of said bleach.

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

The invention of claim 1, 2, 3, 4, 5, or 6 wherein said bleach is 1,12-diperoxydodecanedioic acid and said agent is sodium laurate wherein said agent is present at a level of from about 10% to about 60% by weight of said bleach.