# US 7,612,029 B2 · Controlled release using gels in a melamine foam

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- Number: US 7,612,029 B2
- Document ID: US7612029B2
- Status: Granted
- Kind: B2
- Application number: 11/279,284
- Filed: 2006-04-11
- Published: 2007-10-11
- Granted: 2009-11-03
- Earliest claimed: 2006-04-11
- Assignees: The Clorox Company
- Inventors: Lafayette D. Foland; Mimi Y. Lee; David Lestage; Sara Morales
- Web page: https://patentgrep.com/patent/US7612029B2

## CPC

- C11D 17/049: {Cleaning or scouring pads; Wipes}
- C11D 3/222: {Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

A substrate comprising a nonwoven layer containing an ionically crosslinked polymer can be used to control the release of active ingredients. The substrate can be a melamine foam and contain a surfactant and an alginate polymer crosslinked with calcium.

## Claims

### Claim 1

A method of making a cleaning substrate comprising the steps of:
a. providing a substrate layer comprising a melamine foam;
b. forming an active layer on the substrate by
i. contacting the substrate layer with a first composition comprising a saccharinic gum; and
ii. then contacting the substrate layer with a second composition comprising divalent metal ions and their salts, trivalent metal ions and their salts, and mixtures thereof.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first composition additionally comprises an active material selected from the group consisting of a surfactant, a fragrance, a dye, and combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the first composition additionally comprises an antimicrobial agent.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first composition additionally comprises an essential oil.

### Claim 5 (depends on 1)

The method of claim 1, wherein the second composition additionally comprises an antimicrobial agent.

### Claim 6 (depends on 1)

The method of claim 1, wherein the second composition additionally comprises an essential oil.

### Claim 7 (depends on 1)

The method of claim 1, wherein the saccharinic gum is an alginate.

### Claim 8 (depends on 1)

A cleaning substrate prepared by the method of claim 1.

### Claim 9 (depends on 8)

The cleaning substrate of claim 8, wherein the first composition additionally comprises an active material selected from the group consisting of a surfactant, a fragrance, a dye, and combinations thereof.

### Claim 10 (depends on 8)

The cleaning substrate of claim 8, wherein the first composition additionally comprises an antimicrobial agent.

### Claim 11 (depends on 8)

The cleaning substrate of claim 8, wherein the first composition additionally comprises an essential oil.

### Claim 12 (depends on 8)

The cleaning substrate of claim 8, wherein the second composition additionally comprises an antimicrobial agent.

### Claim 13 (depends on 8)

The cleaning substrate of claim 8, wherein the second composition additionally comprises an essential oil.

### Claim 14 (depends on 8)

The cleaning substrate of claim 8, wherein the saccharinic gum is an alginate.