US4978471A
Expired / Lapsed
US
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Dispersible silicone wash and rinse cycle antifoam formulations
Assignee: Dow Silicones Corp
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Filing: 1989-08-07
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Granted: 1990-12-18
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Expires: 2009-08-07
Abstract
Abstract A dispersible silicone antifoam composition for providing controlled foaming laundry detergent formulations effective in both the wash and the rinse cycles of a washing machine. The antifoam includes a non-aqueous emulsion of primary and secondary silicone antifoam agents, at least one nonionic silicone surfactant for emulsifying the primary and secondary antifoam agents in a solvent, a first organic surfactant dispersing agent for assisting in dispersing the emulsified primary and secondary antifoam agents in the laundry detergent, and a second dispersing agent of a nonionic difunctional block-copolymer terminating in primary hydroxyl groups for further assisting in dispersing the emulsified primary and secondary antifoam agents in the laundry detergent.
Inventors
- 👤 Michael S. Starch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:40
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/37; C11D3/0005; C11D3/0026; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; B01D19/0409; C11D3/3703; C11D3/373
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
142 words
In a laundry detergent including a surfactant, builder, and at least one foam control agent, the improvement comprising a dispersible silicone antifoam composition for providing controlled foaming comprised of a non-aqueous emulsion of primary and secondary antifoam agents; the primary antifoam agent being a mixture of (a) a polyorganosiloxane, (b) a resinous siloxane or a silicone resin-producing silicon compound, (c) a finely divided filler material, and (d) a catalyst to promote the reaction of mixture components (a), (b), and (c), to form silanolates; the secondary antifoam agent being a blend of a polydimethylsiloxane substituted with polar groups and a polydimethylsiloxane fluid; the substituted polydimethylsiloxane providing more effective reduction of foaming in the laundry rinse cycle; at least one nonionic silicon surfactant, a first organic surfactant dispersing agent, and a second dispersing agent of a nonionic difunctional block-copolymer terminating in primary hydroxyl groups.
Claim 2
Dependent Claim
142 words
In a laundry detergent including a surfactant, builder, and at least one foam control agent, the improvement comprising a dispersible silicone antifoam composition for providing controlled foaming comprised of a non-aqueous emulsion of primary and secondary antifoam agents; the primary antifoam agent being a mixture of (a) a polyorganosiloxane, (b) a resinous siloxane or a silicone resin-producing silicon compound, (c) a finely divided filler material, and (d) a catalyst to promote the reaction of mixture components (a), (b), and (c), to form silanolates; the secondary antifoam agent being a blend of a polydimethylsiloxane substituted with polar groups and a polydimethylsiloxane fluid; the substituted polydimethylsiloxane providing more effective reduction of foaming in the laundry rinse cycle; at least one nonionic silicon surfactant, a first organic surfactant dispersing agent, and a second dispersing agent of a nonionic difunctional block-copolymer terminating in primary hydroxyl groups.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein the nonionic silicone surfactant is a copolymer of polymethylsiloxane and polyalkylene oxide in a polyalkylene oxide solvent.
Claim 4
Dependent Claim
30 words
The composition of claim 2 including a second nonionic silicone surfactant which is a trimethylsilyl endcapped polysilicate which has been condensed with a polyalkylene glycol or diester in a solvent.
Claim 5
Dependent Claim
23 words
The composition of claim 3 wherein the polydimethylsiloxane fluid of the blended secondary antifoam agent has a viscosity of about one thousand centistokes.
Claim 6
Dependent Claim
22 words
The composition of claim 4 wherein the solvent is polypropylene glycol having an average molecular weight of about one to four thousand.
Claim 7
Dependent Claim
16 words
The composition of claim 5 wherein the block copolymer is an ethylene oxide-propylene oxide block copolymer.
Claim 8
Dependent Claim
206 words
The composition of claim 1 wherein the polydimethylsiloxane substituted with polar groups is a siloxane having the formula R a X 3-a Si(OSiX 2 ) n (OSiX b R 2-b ) m OSiX 3-a R a wherein R is a monovalent radical having the general formula --C y H 2y Z wherein y has a value of 2 to 8 and Z is selected from the group consisting of --NR'CH 2 CH 2 NR' 2 , --COOH, --SCH 2 COOH, ##STR3## --NR' 2 , --N + R' 3 A - , --N + R'H 2 A - , and --NR'CH 2 CH 2 N + R'H 2 A - , wherein R'; is selected from the group consisting of hydrogen, phenyl, henzyl, and monovalent saturated hydrocarbon radicals composed of 1 to 20 carbon atoms and A - is a halogen; X is selected from the group consisting of hydrogen, phenyl, hydroxyl, and saturated hydrocarbon radicals composed of 1 to 8 carbon atoms; a has a value of 0 to 3; b has a value of 0 to 1; and n m has a value of 1 to 2000 with n having a value of 0 to 1999 and n+m having a value of 1 to 2000.
Claim 9
Dependent Claim
123 words
A dispersible silicone antifoam composition for providing controlled foaming comprising a non-aqueous emulsion of primary and secondary antifoam agents; the primary antifoam agent being a mixture of (a) a polyorganosiloxane, (b) a resinous siloxane or a silicon resin-producing silicon compound, (c) a finely divided filler material, and (d) a catalyst to promote the reaction of mixture components (a), (b) and (c), to form silanolates; the secondary antifoam agent being a blend of a polydimethylsiloxane substituted with polar groups and a polydimethylsiloxane fluid; the substituted polydimethylsiloxane providing more effective reduction of foaming in the laundry rinse cycle; at least one nonionic silicone surfactant, a first organic surfactant dispersing agent, and a second dispersing agent of a nonionic difunctional block-copolymer terminating in primary hydroxyl groups.
Claim 10
Dependent Claim
123 words
A dispersible silicone antifoam composition for providing controlled foaming comprising a non-aqueous emulsion of primary and secondary antifoam agents; the primary antifoam agent being a mixture of (a) a polyorganosiloxane, (b) a resinous siloxane or a silicon resin-producing silicon compound, (c) a finely divided filler material, and (d) a catalyst to promote the reaction of mixture components (a), (b) and (c), to form silanolates; the secondary antifoam agent being a blend of a polydimethylsiloxane substituted with polar groups and a polydimethylsiloxane fluid; the substituted polydimethylsiloxane providing more effective reduction of foaming in the laundry rinse cycle; at least one nonionic silicone surfactant, a first organic surfactant dispersing agent, and a second dispersing agent of a nonionic difunctional block-copolymer terminating in primary hydroxyl groups.
Claim 11
Dependent Claim
23 words
The composition of claim 8 wherein the nonionic silicone surfactant is a copolymer of polymethylsiloxane and polyalkylene oxide in a polyalkylene oxide solvent.
Claim 12
Dependent Claim
30 words
The composition of claim 9 including a second nonionic silicone surfactant which is a trimethylsilyl endcapped polysilicate which has been condensed with a polyalkylene glycol or diester in a solvent.
Claim 13
Dependent Claim
23 words
The composition of claim 10 wherein the polydimethylsiloxane fluid of the blended secondary antifoam agent has a viscosity of about one thousand centistokes.
Claim 14
Dependent Claim
22 words
The composition of claim 11 wherein the solvent is polypropylene glycol having an average molecular weight of about one to four thousand.
Claim 15
Dependent Claim
16 words
The composition of claim 12 wherein the block copolymer is an ethylene oxide-propylene oxide block copolymer.
Claim 16
Dependent Claim
206 words
The composition of claim 8 wherein the polydimethylsiloxane substituted with polar groups is a siloxane having the formula R a X 3-a Si(OSiX 2 ) n (OSiX b R 2-b ) m OSiX 3-a R a wherein R is a monovalent radical having the general formula --C y H 2y Z wherein y has a value of 2 to 8 and Z is selected from the group consisting of --NR'CH 2 CH 2 NR' 2 , --COOH, --SCH 2 COOH, ##STR4## --NR' 2 , --N + R' 3 A - , --N + R'H 2 A - , and --NR'CH 2 CH 2 N + R'H 2 A - , wherein R'; is selected from the group consisting of hydrogen, phenyl, benzyl, and monovalent saturated hydrocarbon radicals composed of 1 to 20 carbon atoms and A - is a halogen; X is selected from the group consisting of hydrogen, phenyl, hydroxyl, and saturated hydrocarbon radicals composed of 1 to 8 carbon atoms; a has a value of 0 to 3; b has a value of 0 to 1; and n m has a value of 1 to 2000 with n having a value of 0 to 1999 and m having a value of 1 to 2000.
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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) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |