US4762736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a coating
Assignee: Unilever Patent Holdings BV
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Filing: 1987-04-22
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Granted: 1988-08-09
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Expires: 2007-04-22
Abstract
Abstract This invention discloses the preparation of coatings on substrates. The coating is derived from a film formed at a sol air interface and the film is bonded to the substrate by direct contact. The coating preferably contains silica.
Inventors
- 👤 Michael J. Garvey
- 👤 Ian C. Griffiths
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:27
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C04B41/45; C04B41/4505; C04B41/50; C04B41/5025; C04B41/5035; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C23; C23C; C23C24/00; C23D; C23D13/00; G; G11; G11B; G11B5/00; G11B5/84; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/213; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/111; C03C2218/113; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/366
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A process for the deposition of a coating on a substrate characterised by generating an interface on a sol containing a surfactant, the amount of surfactant being sufficient to cause a film of colloidal material comprising the sol to form at the interface, and contacting the substrate and film so as to deposit the film onto the substrate.
Claim 2
Dependent Claim
58 words
A process for the deposition of a coating on a substrate characterised by generating an interface on a sol containing a surfactant, the amount of surfactant being sufficient to cause a film of colloidal material comprising the sol to form at the interface, and contacting the substrate and film so as to deposit the film onto the substrate.
Claim 3
Dependent Claim
31 words
A process as claimed in claim 1 in which colloidal material is selected from the group consisting of insoluble or sparingly soluble inorganic particles, organic particles, polymeric particles and mixtures thereof.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 1 in which the colloidal material includes silica.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 3 in which the sol includes 0.001 to 30 wt % silica with respect to the total weight of the sol.
Claim 6
Dependent Claim
33 words
A process as claimed in claim 1 in which the sol includes an amount of surfactant less than that required to form a monolayer according to the expression 3/ρrAN moles g -1 .
Claim 7
Dependent Claim
29 words
A process as claimed in claim 1 in which the sol includes an amount of surfactant in the range of 0.1 to 100 mg per gram of colloidal material.
Claim 8
Dependent Claim
31 words
A process as claimed in claim 1 in which the substrate is drawn through the interface at which the film has formed so as to contact the film and the substrate.
Claim 9
Dependent Claim
38 words
A process as claimed in claim 1 in which the substrate is in the form of beads and the sol surfactant mixture is raised to immerse the beads at least once to deposit a coating on the beads.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |