US5164003A
Expired / Lapsed
US
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Room temperature curable surface coating and methods of producing and applying same
Assignee: Ceram Tech International Ltd
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Filing: 1990-03-28
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Granted: 1992-11-17
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Expires: 2010-03-28
Abstract
Abstract A silica-based coating for, and a method for coating glass, metal, ceramic, and plastic surfaces by forming single cross-linked O-Si-O polymer chains. The coating generally comprises a binder and a filler. The binder is a mixture of silica-based polymers, colloidal silica, and metal oxide particles in an aqueous suspension. It includes four main ingredients: an alkali metal silicate; silica gel; a cross-linking agent such as methyltrimethoxysilane or tetraethoxysilane; and water. After curing, the binder forms an amorphous layer that binds the fillers to the surface. The protective coating is formed at room temperature, without the addition of energy in any form. The fillers are chosen to provide the coating with mechanical strength, abrasion resistance, and increased corrosion resistance. Fillers may also be chosen to modify the coating's dielectric constant, to improve the coating's surface lubricity, and to alter the coating's thermal coefficient of expansion. Typical fillers include clay, wollastonite, nepheline syenite, talc, flint, ceramic fibers, metallic fibers, ceramic microspheres, glass microspheres, cerium dioxide, and dichromium trioxide.
Inventors
- 👤 Paul N. Bosco
- 👤 Terrance Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C09; C09D; C09D1/00; C09D1/02; C04B12/00; C04B12/04; C04B28/00; C04B28/24; C04B28/26; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5076; C04B41/5089; C04B2111/00; C04B2111/00474; C04B2111/00482
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
56 words
An amorphous ceramic coating, comprising a silica-based binder and a filler, said coating chemically bonding at room temperature to surfaces selected from the group consisting of glass, metal, ceramic and plastic, wherein said binder and filler comprise 2-60 volume percent dichromium trioxide, and said dichromium trioxide has an average particle size no greater than 0.5 microns.
Claim 2
Dependent Claim
56 words
An amorphous ceramic coating, comprising a silica-based binder and a filler, said coating chemically bonding at room temperature to surfaces selected from the group consisting of glass, metal, ceramic and plastic, wherein said binder and filler comprise 2-60 volume percent dichromium trioxide, and said dichromium trioxide has an average particle size no greater than 0.5 microns.
Claim 3
Dependent Claim
21 words
The amorphous ceramic coating as set forth in claim 1, wherein said silica-based binder comprises a cross-linking agent consisting of methyltrimethoxysilane.
Claim 4
Dependent Claim
32 words
The amorphous ceramic coating as set forth in claim 1, wherein said silica-based binder comprises a cross-linking agent selected from the group consisting of tetraethoxysilane and a mixture of methyltrimethoxysilane and tetraethoxysilane.
Claim 5
Dependent Claim
30 words
The amorphous ceramic coating as set forth in claim 1, wherein said silica-based binder comprises a cross-linking agent selected from the group consisting of alkyltrialkoxysilane, aromatictrialkoxysilane, tetraalkoxysilane, and mixtures thereof.
Claim 6
Dependent Claim
23 words
The amorphous ceramic coating as set forth in claim 1, wherein said silica-based binder comprises a cross-linking agent consisting of an organo-functional silane.
Claim 7
Dependent Claim
19 words
The amorphous ceramic coating as set forth in claim 1, wherein said silica-based binder comprises an alkali metal silicate.
Claim 8
Dependent Claim
29 words
The amorphous ceramic coating as set forth in claim 6, wherein said alkali metal silicate is selected from a group consisting of potassium silicate, sodium silicate, and lithium silicate.
Claim 9
Dependent Claim
17 words
The amorphous ceramic coating as set forth in claim 6, wherein said silica-based binder comprises silica gel.
Claim 10
Dependent Claim
77 words
The coating as set forth in claim 1, wherein said filler comprises dichromium trioxide at a concentration of 2-15 volume percent, clay at a concentration of 3-15 volume percent, nepheline syenite at a concentration of 2-10 volume percent, ceramic fibers at a concentration of 2-12 volume percent, talc at a concentration of 2-12 volume percent, flint at a concentration of 5-30 volume percent, and ceramic microspheres at a concentration of 15-25 volume percent or 50-65 volume percent.
Claim 11
Dependent Claim
69 words
An aqueous suspension, comprising a silica-based binder, dichromium trioxide, and a filler, said silica-based binder comprising an alkali metal silicate, silica gel, and a cross linking agent, said aqueous suspension being suitable for forming a coating, said coating being formed upon application to a surface and curing, said suspension further comprising 2-60 volume percent dichromium trioxide, said dichromium trioxide having an average particle size no greater than 0.5 microns.
Claim 12
Dependent Claim
69 words
An aqueous suspension, comprising a silica-based binder, dichromium trioxide, and a filler, said silica-based binder comprising an alkali metal silicate, silica gel, and a cross linking agent, said aqueous suspension being suitable for forming a coating, said coating being formed upon application to a surface and curing, said suspension further comprising 2-60 volume percent dichromium trioxide, said dichromium trioxide having an average particle size no greater than 0.5 microns.
Claim 13
Dependent Claim
30 words
The coating formed upon application to a surface and curing as set forth in claim 10, wherein said silica-based binder comprises alkali metal oxides, O-Si-O polymer chains, and silanol radicals.
Claim 14
Dependent Claim
16 words
The coating as set forth in claim 11, wherein said alkali metal silicate is potassium silicate.
Claim 15
Dependent Claim
25 words
The coating as set forth in claim 11, wherein said alkali metal silicate is selected from the group consisting of sodium silicate and lithium silicate.
Claim 16
Dependent Claim
14 words
The coating as set forth in claim 11, wherein said cross-linking agent comprises methyltrimethoxysilane.
Claim 17
Dependent Claim
14 words
The coating as set forth in claim 11, wherein said cross-linking agent comprises tetraethoxysilane.
Claim 18
Dependent Claim
26 words
The coating as set forth in claim 11, wherein said cross-linking agent is selected from the group consisting of alkyltrialkoxysilane, aromatictrialkoxysilane, and tetraalkoxysilane, and mixtures thereof.
Claim 19
Dependent Claim
16 words
The coating as set forth in claim 11, wherein said cross-linking agent is an organo-functional silane.
Claim 20
Dependent Claim
77 words
The coating as set forth in claim 11, wherein said filler comprises dichromium trioxide at a concentration of 2-15 volume percent, clay at a concentration of 3-15 volume percent, nepheline syenite at a concentration of 2-10 volume percent, ceramic fibers at a concentration of 2-12 volume percent, talc at a concentration of 2-12 volume percent, flint at a concentration of 5-30 volume percent, and ceramic microspheres at a concentration of 15-25 volume percent or 50-65 volume percent.
Claim 21
Dependent Claim
38 words
The coating as set forth in claim 11, wherein said filler comprises clay at a concentration of 3-15 volume percent, nepheline syenite at a concentration of 2-10 volume percent, and talc at a concentration of 2-12 volume percent.
Claim 22
Dependent Claim
39 words
The coating formed upon application to a surface and curing as set forth in claim 10, wherein the molar ratio of the total amount of SiO 2 to alkali metal oxide in the binder is between 6.5 and 8.1.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |