US4752409A
Expired / Lapsed
US
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Thixotropic clay aqueous suspensions
Assignee: Colgate Palmolive Co
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Filing: 1986-09-05
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Granted: 1988-06-21
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Expires: 2006-09-05
Abstract
Abstract The physical stability of liquid gel-like compositions based on montmorillonite, attapulgite, hectorite or other inorganic colloid-forming clay or other thixotropic thickener is greatly improved by incorporating in the composition small amounts, such as 0.1 or 0.2 weight percent, of calcium, magnesium, aluminum or zinc stearate or other polyvalent metal salt of long chain fatty acid. The aqueous compositions containing inorganic builder salts and other functional inorganic salts, chlorine bleach, bleach-stable detergent, thixotropic thickener and polyvalent metal salt of a fatty acid as a physical stabilizer remain stable against phase separation for periods in excess of twelve weeks under a wide range of temperatures. The thixotropic properties can be retained or improved using smaller levels of the clay thixotropic thickener than in the absence of the physical stabilizer. Use as liquid gel-like automatic dishwasher compositions are described.
Inventors
- 👤 Julien Drapier
- 👤 Chantal Gallant
- 👤 Daniel van de Gaer
- 👤 Jean-Paul Delvenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:52
CPC Classifications
C; C11; C11D; C11D17/00; C11D17/0008; C11D17/0013; C11D1/00; C11D1/02; C11D1/04; C11D17/003; C11D3/00; C11D3/02; C11D3/12; C11D3/124; C11D3/1246; C11D3/1253; C11D3/1266; C11D3/16; C11D3/20; C11D3/2075; C11D3/2079
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
136 words
An aqueous thixotropic automatic dishwasher composition comprising approximately by weight: (a) 5 to 35% alkali metal tripolyphosphate; (b) 2.5 to 20% sodium silicate; (c) 0 to 9% alkali metal carbonate; (d) 0.1 to 5% chorine bleach stable, water-dispersible organic detergent active material; (e) 0.1 to 5% chlorine bleach stable foam depressant; (f) chlorine bleach compound in an amount to provide about 0.2 to 4% of available chlorine; (g) 0.1 to 10.0% thixotropic thickener in an amount sufficient to provide the composition with a thixotropy index of about 2 to 10; (h) 0 to 8% of sodium hydroxide; (i) 0.08 to 0.40 of a polyvalent metal salt of a long chain 8 to 22 carbon fatty acid as a physical stabilizer in an amount effective to increase the physical stability of the composition; and (j) balance water.
Claim 2
Dependent Claim
136 words
An aqueous thixotropic automatic dishwasher composition comprising approximately by weight: (a) 5 to 35% alkali metal tripolyphosphate; (b) 2.5 to 20% sodium silicate; (c) 0 to 9% alkali metal carbonate; (d) 0.1 to 5% chorine bleach stable, water-dispersible organic detergent active material; (e) 0.1 to 5% chlorine bleach stable foam depressant; (f) chlorine bleach compound in an amount to provide about 0.2 to 4% of available chlorine; (g) 0.1 to 10.0% thixotropic thickener in an amount sufficient to provide the composition with a thixotropy index of about 2 to 10; (h) 0 to 8% of sodium hydroxide; (i) 0.08 to 0.40 of a polyvalent metal salt of a long chain 8 to 22 carbon fatty acid as a physical stabilizer in an amount effective to increase the physical stability of the composition; and (j) balance water.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the physical stabilizer (i) is aluminum tristearate or zinc distearate.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein the thixotropic thickener (g) is an inorganic, colloid-forming clay.
Claim 5
Dependent Claim
16 words
The composition of claim 3 wherein the clay is an attapulgite clay, or a smectite clay.
Claim 6
Dependent Claim
22 words
The composition of claim 3 wherein the amount of the clay thickener is in the range of from about 0.1 to 3%.
Claim 7
Dependent Claim
24 words
The composition of claim 1 which contains from about 0.1 to 2% by weight of an inorganic, colloid-forming clay as the thixotropic thickener (g).
Claim 8
Dependent Claim
13 words
The composition of claim 1 having a pH of 10.5 to about 13.5.
Claim 9
Dependent Claim
61 words
A composition of claim 1 having a viscosity at low shear conditions which is about 2 to 3 times higher than the viscosity at low shear conditions of the composition without the long chain fatty acid metal salt, and whereby the viscosity of the composition at high shear conditions is from about 1/2 to 1/10 the viscosity at low shear conditions.
Claim 10
Dependent Claim
24 words
The composition of claim 8 wherein the long chain fatty acid metal salt is a magnesium, calcium, aluminum or zinc salt of stearic acid.
Claim 11
Dependent Claim
44 words
The composition of claim 1, wherein the physical stabilizer (i) is a polyvalent metal salt of an aliphatic fatty acid having from about 10 to 20 carbon atoms and the polyvalent metal is selected from the group consisting of Mg, Ca, Al and Zn.
Claim 12
Dependent Claim
28 words
The composition of claim 1, wherein the physical stabilizer (i) is a polyvalent metal salt of an aliphatic fatty acid having from about 12 to 18 carbon atoms.
Claim 13
Dependent Claim
43 words
The composition of claim 1, wherein the physical stabilizer (i) is a polyvalent metal salt of an aliphatic fatty acid selected from the group consisting of stearic acid, myristic acid, palmitic acid, oleic acid, tallow fatty acid, soya fatty acid, and mixtures thereof.
Claim 14
Dependent Claim
30 words
The composition of claim 1 wherein at applied shear rates of 3 to 30 rpm, the viscosities (Brookfield) correspondingly ranged from about 10,000 to 30,000 cps to about 3000-7000 cps.
Claim 15
Dependent Claim
16 words
The composition of claim 1 adapted to have a density of about 1.29 g/cm 3 .
Claim 16
Dependent Claim
77 words
The composition of claim 1 in which the foam depressant (e) is an alkyl acid phosphate ester or an alkyl phosphonic acid ester containing one or two C 12-20 alkyl groups or a mixture thereof and the detergent active material (d) is selected from the group consisting of branched alkali metal mono- and di- C 8-14 alkyl diphenyl oxide mono- and disulfonates and linear alkali metal mono- and di- C 8-14 alkyl diphenyl oxide mono- and disulfonates.
Claim 17
Dependent Claim
22 words
The composition of claim 1 wherein the alkali metal carbonate (c) is present in an amount from about 2% to about 9%.
Claim 18
Dependent Claim
20 words
The composition of claim 1 wherein the sodium hydroxide (h) is present in an amount from about 0.5% to 6%.
Claim 19
Dependent Claim
78 words
A method for cleaning soiled dishware in an automatic dishwashing machine which comprises contacting the soiled dishware in an automatic dishwashing machine in an aqueous washbath having dispersed therein an effective amount of the composition of claim 1 by pouring said composition into the dispensing cup of the automatic dishwashing machine, permitting said composition to thicken in said dispensing cup and subsequently applying a shear to said composition such as by the water spray from the dishwashing machine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |