US4052520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating a synthetic polymer sheet material with a durable abrasion-resistant vitreous composition
Assignee: American Optical Corp
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Filing: 1976-08-12
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Granted: 1977-10-04
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Expires: 1996-08-12
Abstract
Abstract There is disclosed a process for improving the adhesion of an evaporable glass coating on a synthetic polymer sheet material by the application of a base vitreous coating of a mixture of silicon dioxide and silicon monoxide by evaporating silicon monoxide under vacuum in an oxygen atmosphere so that in addition to silicon monoxide, a silicon dioxide condensate is condensed on the outer surface of the sheet. An outer vitreous coating is subsequently applied over said base coating. The evaporative glass outer coating can be formed essentially from boron oxide and silicon dioxide containing less than 5% by weight of sodium oxide. The evaporative glass coating can also be of fused silica, or a boro-silicate glass sold under the trademark "Pyrex".
Inventors
- 👤 Leei Chang
- 👤 John A. Verburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:16
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; C; C23; C23C; C23C14/00; C23C14/06; C23C14/10; G02C; G02C7/00; G02C7/02; C03; C03C; C03C2217/00; C03C2217/70; C03C2217/78; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
The method of coating a sheet of material of diallyl glycol carbonate polymer comprising the steps of: 1. first step -- hydroxylating the sheet surface to be coated; 2. second step -- applying to the hydroxylated surface of the sheet by vacuum deposition a base coating of a material selected from the group consisting of silicon monoxide and a mixture of silicon dioxide and silicon monoxide, by evaporation of silicon monoxide in an oxygen atmosphere under a vacuum lower than 1 × 10 -4 torr, said base coating being at least one molecule in thickness; and 3. third step -- applying to the coated surface of the sheet of the second step by vacuum deposition an outer coating of evaporable glass, said evaporable glass being in a thickness of about one micrometer or higher, said glass coating being applied at a pressure lower than 5 × 10 -4 torr.
Claim 2
Independent Claim
149 words
The method of coating a sheet of material of diallyl glycol carbonate polymer comprising the steps of: 1. first step -- hydroxylating the sheet surface to be coated; 2. second step -- applying to the hydroxylated surface of the sheet by vacuum deposition a base coating of a material selected from the group consisting of silicon monoxide and a mixture of silicon dioxide and silicon monoxide, by evaporation of silicon monoxide in an oxygen atmosphere under a vacuum lower than 1 × 10 -4 torr, said base coating being at least one molecule in thickness; and 3. third step -- applying to the coated surface of the sheet of the second step by vacuum deposition an outer coating of evaporable glass, said evaporable glass being in a thickness of about one micrometer or higher, said glass coating being applied at a pressure lower than 5 × 10 -4 torr.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein said process includes as the first step the hydroxylating of the surface of said sheet by alkali treatment.
Claim 4
Dependent Claim
21 words
A method according to claim 2 wherein said alkali is selected from the group consisting of sodium hydroxide and potassium hydroxide.
Claim 5
Dependent Claim
15 words
A method according to claim 3 wherein said alkali is utilized as an aqueous solution.
Claim 6
Dependent Claim
26 words
A method according to claim 2 wherein said vacuum deposition of the evaporable glass is effected in a vacuum lower than 5 × 10 -4 torr.
Claim 7
Dependent Claim
76 words
A method according to claim 2 wherein said evaporable glass is selected from the group consisting of (1) a glass consisting essentially of boron oxide and silicon dioxide containing less than 5% by weight of Na 2 O (2) fused silica, and (3) a borosilicate glass of the following weight percentage composition: SiO 2 -- 80.2 B 2 o 3 -- 13.5 al 2 O 3 -- 2.2 Na 2 O -- 4.0 CaO -- 0.1
Claim 8
Dependent Claim
26 words
A method according to claim 2 wherein said vacuum deposition of said base coating is effected in a vacuum lower than 1 × 10 -4 torr.
Claim 9
Dependent Claim
52 words
A method according to claim 2 wherein said alkali is utilized as an aqueous solution of sodium hydroxide and wherein said evaporable glass is a glass comprising boron oxide and silicon dioxide and up to 5% by weight of Na 2 O and is applied in a thickness of about 4 micrometers.
Claim 10
Independent Claim
135 words
The method of coating a sheet of material of an aromatic polycarbonate comprising the steps of: 1. first step -- applying to the sheet by vacuum deposition a base coating of a material selected from the group consisting of silicon monoxide and a mixture of silicon dioxide and silicon monoxide, by evaporation of silicon monoxide in an oxygen atmosphere under a vacuum lower than 1 × 10 -4 torr, said base coating being at least one molecule in thickness; and 2. second step -- applying to the coated surface of the sheet of the first step by vacuum deposition an outer coating of evaporable glass under vacuum, said evaporable glass being in a thickness of about one micrometer or higher, said glass coating being applied at a pressure lower than 5 × 10 -4 torr.
Claim 11
Independent Claim
135 words
The method of coating a sheet of material of an aromatic polycarbonate comprising the steps of: 1. first step -- applying to the sheet by vacuum deposition a base coating of a material selected from the group consisting of silicon monoxide and a mixture of silicon dioxide and silicon monoxide, by evaporation of silicon monoxide in an oxygen atmosphere under a vacuum lower than 1 × 10 -4 torr, said base coating being at least one molecule in thickness; and 2. second step -- applying to the coated surface of the sheet of the first step by vacuum deposition an outer coating of evaporable glass under vacuum, said evaporable glass being in a thickness of about one micrometer or higher, said glass coating being applied at a pressure lower than 5 × 10 -4 torr.
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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) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |