US4171227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina-silica binder for coating compositions
Assignee: PQ Corp
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Filing: 1978-01-19
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Granted: 1979-10-16
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Expires: 1998-01-19
Abstract
Abstract A binder system useful in formulating coatings for glass, metal, wood and especially light diffusive coatings for glass light bulb envelopes is disclosed. Excellent coatings can be formed using a binder system comprising dispersible colloidal particles of alumina and finely divided, precipitated silica. When a stable dispersion of these two materials is combined properly with a pigment and/or filler system and then dried upon a glass, metal or wood surface, a tough, continuous, tightly adhering coating is formed. By using the correct pigments, a light diffusive coating for light bulb envelopes can be formed.
Inventors
- 👤 M. Robert Derolf
- 👤 Eleftherios P. Katsanis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:09
CPC Classifications
C; C09; C09D; C09D1/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
97 words
A stable binder composition useful in producing coatings on glass, metal and wood, comprising: (a) 1 to 22% by weight of dispersible colloidal particles of Al 2 O 3 with sufficient acid to stabilize the Al 2 O 3 ; said acid having a monovalent cation; (b) 0.1 to 11% by weight of finely divided precipitated silica having an ultimate particle size in the colloidal region, 1 part by weight of said silica being present for every 2 to 20 parts by weight of Al 2 O 3 ; and (c) the balance to 100% as water.
Claim 2
Dependent Claim
97 words
A stable binder composition useful in producing coatings on glass, metal and wood, comprising: (a) 1 to 22% by weight of dispersible colloidal particles of Al 2 O 3 with sufficient acid to stabilize the Al 2 O 3 ; said acid having a monovalent cation; (b) 0.1 to 11% by weight of finely divided precipitated silica having an ultimate particle size in the colloidal region, 1 part by weight of said silica being present for every 2 to 20 parts by weight of Al 2 O 3 ; and (c) the balance to 100% as water.
Claim 3
Dependent Claim
22 words
The binder of claim 1 wherein the acid is selected from the group consisting of HCl, HNO 3 , acetic and formic.
Claim 4
Dependent Claim
34 words
The binder of claim 2 wherein the acid is HCl and the composition contains 1 part by weight of HCl for every 20 to 70 parts by weight of Al 2 O 3 .
Claim 5
Dependent Claim
29 words
The composition of claim 3 wherein the binder contains 1 part by weight of HCl for every 50 to 70 parts by weight of Al 2 O 3 .
Claim 6
Dependent Claim
11 words
The binder of claim 1 wherein the alumina is α-alumina monohydrate.
Claim 7
Dependent Claim
23 words
The binder of claim 5 wherein the α-alumina monohydrate has 10% surface water and a particle size of about 5 to 10 nanometers.
Claim 8
Dependent Claim
128 words
A coating composition comprising: (a) 0.9 to 20% by weight of dispersible colloidal particles of Al 2 O 3 with sufficient acid to stabilize the Al 2 O 3 ; said acid having a monovalent cation; (b) 0.1 to 10% by weight of finely divided precipitated silica having an ultimate particle size in the colloidal region, 1 part by weight of said silica being present for every 2 to 20 parts by weight of Al 2 O 3 ; (c) 0.4 to 18.4% by weight of one or more pigments and fillers selected from the group consisting of iron oxides, carbon black, titanium oxide, antimony oxide, cadmium sulfide, chromium oxide, zirconium oxide, calcium silicate, talc, silica gel and ground glass; and (d) the balance to 100% is water.
Claim 9
Dependent Claim
128 words
A coating composition comprising: (a) 0.9 to 20% by weight of dispersible colloidal particles of Al 2 O 3 with sufficient acid to stabilize the Al 2 O 3 ; said acid having a monovalent cation; (b) 0.1 to 10% by weight of finely divided precipitated silica having an ultimate particle size in the colloidal region, 1 part by weight of said silica being present for every 2 to 20 parts by weight of Al 2 O 3 ; (c) 0.4 to 18.4% by weight of one or more pigments and fillers selected from the group consisting of iron oxides, carbon black, titanium oxide, antimony oxide, cadmium sulfide, chromium oxide, zirconium oxide, calcium silicate, talc, silica gel and ground glass; and (d) the balance to 100% is water.
Claim 10
Dependent Claim
22 words
The composition of claim 7 wherein the acid is selected from the group consisting of HCl, HNO 3 , acetic and formic.
Claim 11
Dependent Claim
34 words
The composition of claim 8 wherein the acid is HCl and the composition contains 1 part by weight of HCl for every 20 to 70 parts by weight of Al 2 O 3 .
Claim 12
Dependent Claim
29 words
The composition of claim 9 wherein the composition contains 1 part by weight of HCl for every 20 to 35 parts by weight of Al 2 O 3 .
Claim 13
Dependent Claim
12 words
The coating composition of claim 7 wherein the alumina is α-alumina monohydrate.
Claim 14
Dependent Claim
26 words
The coating composition of claim 7 wherein the α-alumina monohydrate has 10% by weight surface water and a particle size of about 5 to 10 nanometers.
Claim 15
Dependent Claim
136 words
A coating composition useful in preparing light diffusive coating for light bulb envelopes, consisting essentially of: (a) 1 to 22% by weight of dispersible α-alumina monohydrate having about 10% surface moisture and a particle size of about 5 to 10 nanometers; (b) 1 part by weight of HCl for every 20 to 70 parts by weight of Al 2 O 3 ; (c) 0.1 to 11% by weight of finely divided amorphous silica having an ultimate particle size in the colloidal range, said silica being precipitated from sodium silicate, said silica being present in an amount such that there is 1 part by weight of silica for every 2 to 20 parts by weight of Al 2 O 3 ; (d) 2 to 16% by weight of titanium dioxide; and (e) the remainder to 100% water.
Claim 16
Dependent Claim
136 words
A coating composition useful in preparing light diffusive coating for light bulb envelopes, consisting essentially of: (a) 1 to 22% by weight of dispersible α-alumina monohydrate having about 10% surface moisture and a particle size of about 5 to 10 nanometers; (b) 1 part by weight of HCl for every 20 to 70 parts by weight of Al 2 O 3 ; (c) 0.1 to 11% by weight of finely divided amorphous silica having an ultimate particle size in the colloidal range, said silica being precipitated from sodium silicate, said silica being present in an amount such that there is 1 part by weight of silica for every 2 to 20 parts by weight of Al 2 O 3 ; (d) 2 to 16% by weight of titanium dioxide; and (e) the remainder to 100% water.
Claim 17
Dependent Claim
25 words
The composition of claim 13 wherein the composition contains 1 part by weight of HCl for every 50 to 70 parts by weight of alumina.
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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |