# US 5,703,027 A · Monomeric rich silicate system in automatic dishwashing composition with improved glass etching

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- Number: US 5,703,027 A
- Document ID: US5703027A
- Status: Granted
- Kind: A
- Application number: 08/346,560
- Filed: 1994-11-29
- Granted: 1997-12-30
- Earliest claimed: 1994-11-29
- Assignees: The Procter & Gamble Company
- Inventors: Gregory Stephen Caravajal; Janet Layne Marshall
- Web page: https://patentgrep.com/patent/US5703027A

## CPC

- C11D 3/08: Silicates
- C11D 1/722: Ethers of polyoxyalkylene glycols having mixed oxyalkylene groups; {Polyalkoxylated fatty alcohols or polyalkoxylated alkylaryl alcohols with mixed oxyalkylele groups (C11D1/721 takes precedence)}
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

Automatic dishwashing detergent compositions comprising a certain combination of metasilicate with other silicate (polymeric) components are disclosed. Particularly preferred compositions also comprise low foaming surfactant and detergency builders.

## Claims

### Claim 1

An automatic dishwashing detergent composition comprising, by weight:
(a) from about 1% to about 10% of SiO.sub.2 as monomeric silicate;
(b) from about 1% to about 10% of SiO.sub.2 as a second silicate component having a SiO.sub.2 :M.sub.2 O weight ratio (where M=alkali metal) of from about 2 to about 2.4, wherein said monomeric silicate (a) and silicate component (b) have a SiO.sub.2 weight ratio of from about 10:1 to about 1:10; and wherein the automatic dishwashing detergent composition comprises from about 5% to about 12% total SiO.sub.2 ;
(c) from about 0.01% to about 15% of low foaming surfactant,
(d) from about 0.1% to about 50% of a detergency builder; wherein said detergency builder is a salt or salt/builder of sodium/potassium phosphate; and
(e) from about 0.001% to about 5% of a detersive enzyme; wherein said composition has a pH of from about 9.5 to about 10.5.

### Claim 2 (depends on 1)

A composition according to claim 1 further comprising a bleaching agent selected from the group consisting of peroxygen bleaches and chlorine bleaches.

### Claim 3 (depends on 2)

A composition according to claim 2 wherein said bleaching agent is selected from the group consisting of percarbonate salts and perborate salts.

### Claim 4 (depends on 3)

A liquid composition according to claim 3 further comprising from about 0.01% to about 6% by weight of an enzyme stabilizing system.

### Claim 5 (depends on 4)

A composition according to claim 4 wherein said detersive enzyme is selected from the group consisting of protease, amylase, lipase and mixtures thereof.

### Claim 6 (depends on 5)

A composition according to claim 5 comprising from about 0.005 to about 3% by weight protease or amylase.

### Claim 7 (depends on 1)

A composition according to claim 1 comprising from about 1% to about 10% of SiO.sub.2 as metasilicate and from about 3% to about 6% of said SiO.sub.2 as said second silicate component.

### Claim 8 (depends on 7)

A composition according to claim 7 wherein the weight ratio of metasilicate (a) to second silicate component (b) is between about 3:1 and about 1:2.

### Claim 9 (depends on 2)

A composition according to claim 2 comprising from about 0.01% to about 8% available oxygen.

### Claim 10 (depends on 1)

A composition according to claim 1 further comprising from about 0.1% to about 8% of an anionic co-surfactant.

### Claim 11 (depends on 2)

A composition according to claim 2 wherein said low foaming surfactant is selected from the group consisting of alkoxylated alcohols.

### Claim 12 (depends on 3)

A composition according to claim 3 further comprising from about 0.5% to about 20% of a dispersant polymer.

### Claim 13 (depends on 12)

A composition according to claim 12 wherein said dispersant polymer is selected from the group consisting of polacrylates and polyacrylate copolymers.

### Claim 14

A method for cleaning soiled tableware comprising contacting said tableware with an aqueous detergent composition comprising (a) from about 1% to about 10% SiO.sub.2 as monomeric silicate, (b) from about 1% to about 10% SiO.sub.2 as a second silicate component having a SiO.sub.2 :M.sub.2 O weight ratio (where M=alkali metal) from about 2 to about 2.4, and wherein said monomeric silicate (a) and second silicate component (b) have a SiO.sub.2 weight ratio of from about 3:1 to about 1:2, and wherein the aqueous wash medium comprises from about 5% to about 12% total SiO.sub.2 ; c) nonionic surfactant, d) from about 0.001% to about 5% of a detersive enzyme, and e) detergency builder; wherein said detergency builder is sodium/potassium phosphate; wherein said composition has a pH of from about 9.5 to about 10.5.