US3853989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Defoamer for aerosol concentrates
Assignee: PQ Corp
•
Filing: 1968-02-14
•
Granted: 1974-12-10
•
Expires: 1988-02-14
Abstract
Abstract Internal foaming in aerosol containers may be suppressed by adding about 0.001 to 3% of a hydrophobic silica calculated on the basis of the concentrate (that is the ingredients other than the propellant).
Inventors
- 👤 W Conn
- 👤 C Blake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/02; A61K; A61K8/00; A61K8/02; A61K8/04; A61K8/046; A61K8/18; A61K8/19; A61K8/25; A61Q5/06; C; C09; C09K; C09K3/00; C09K3/30; C11; C11D; C11D17/00; C11D17/0043; C11D3/00; C11D3/0005; C11D3/0094
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
IN THE KNOWN TYPE OF AEROSOL UNIT CONTAINING A FOAMABLE AQUEOUS LIQUID CONCENTRATE AND A PROPELLANT, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN THE AEROSOL UNIT A FINELY DIVIDED HYDROPHOBIC SOLID SILICEOUS MATERIAL IN THE AMOUNT OF ABOUT 0.001-3% BASED ON THE WEIGHT OF SAID CONCENTRATE, SAID HYDROPHOBIC SOLID SILICEOUS MATERIAL IS A FINELY DIVIDED SILICA HAVING A PARTICLE SIZE BETWEEN ABOUT 7 AND 100 U AND A PH ABOVE ABOUT 2 COATED WITH A HYDROPHOBIC ORGANIC FILM.
Claim 2
Dependent Claim
77 words
IN THE KNOWN TYPE OF AEROSOL UNIT CONTAINING A FOAMABLE AQUEOUS LIQUID CONCENTRATE AND A PROPELLANT, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN THE AEROSOL UNIT A FINELY DIVIDED HYDROPHOBIC SOLID SILICEOUS MATERIAL IN THE AMOUNT OF ABOUT 0.001-3% BASED ON THE WEIGHT OF SAID CONCENTRATE, SAID HYDROPHOBIC SOLID SILICEOUS MATERIAL IS A FINELY DIVIDED SILICA HAVING A PARTICLE SIZE BETWEEN ABOUT 7 AND 100 U AND A PH ABOVE ABOUT 2 COATED WITH A HYDROPHOBIC ORGANIC FILM.
Claim 3
Dependent Claim
27 words
An aerosol unit according to claim 1 wherein the organic film is formed by curing a silicone oil adsorbed on the surface of the finely divided silica.
Claim 4
Dependent Claim
16 words
An aerosol unit according to claim 1 wherein said silica is a microfine precipitated hydrated silica.
Claim 5
Dependent Claim
16 words
An aerosol unit according to claim 1 wherein said siliceous material is a finely divided clay.
Claim 6
Dependent Claim
16 words
An aerosol unit according to claim 1 wherein said silica is a finely divided pyrogenic silica.
Claim 7
Dependent Claim
24 words
An aerosol unit according to claim 2 wHerein the silicone oil is selected from the group consisting of dimethyl polysiloxane and hydrogen methyl polysiloxane.
Claim 8
Dependent Claim
29 words
An aerosol unit according to claim 1 in which the propellant is selected from the group consisting of a liquified compressed gas and a mixture of liquified compressed gases.
Claim 9
Dependent Claim
18 words
An aerosol unit according to claim 1 wherein the foamable aqueous liquid concentrate is a shave cream composition.
Claim 10
Dependent Claim
17 words
An aerosol unit according to claim 1 wherein the foamable aqueous liquid concentrate is a detergent composition.
Claim 11
Independent Claim
92 words
A method for controlling foam formation when charging an aerosol unit with a foamable aqueous concentrate and a propellant, which comprises: a. charging the aerosol unit with a mixture of the foamable aqueous concentrate and 0.001 to 3.0% of a finely divided hydrophobic solid siliceous material, said hydrophobic solid siliceous material being a hydrated precipitated silica having an ultimate particle size between 7 and 100 Mu and a pH between 4 and 11 and a surface coating of a polysiloxane cured in situ, and b. charging the aerosol unit with a propellant.
Claim 12
Independent Claim
92 words
A method for controlling foam formation when charging an aerosol unit with a foamable aqueous concentrate and a propellant, which comprises: a. charging the aerosol unit with a mixture of the foamable aqueous concentrate and 0.001 to 3.0% of a finely divided hydrophobic solid siliceous material, said hydrophobic solid siliceous material being a hydrated precipitated silica having an ultimate particle size between 7 and 100 Mu and a pH between 4 and 11 and a surface coating of a polysiloxane cured in situ, and b. charging the aerosol unit with a propellant.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |