US4719146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scratch resistant antireflective coatings for synthetic resins
Assignee: Roehm GmbH Darmstadt
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Filing: 1985-10-21
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Granted: 1988-01-12
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Expires: 2005-10-21
Abstract
Abstract Scratch resistant and antireflective coatings for synthetic resins, said coatings having a refractive index differing from the value 1.45 by at least 0.01 unit and a thickness ranging from 1 to 40 microns and comprising (1) (a) an acrylate and/or methacrylate polymer, and/or (b) an organosilicon polymer, or (c) a melamine resin; and (2) from 0.1 to 10 weight percent of amorphous, porous silicic acid having a large pore volume from 0.1 to 5 ml/g and consisting of primary particles of an average diameter ranging from 1 to 50 microns; synthetic resin substrates having such a coating thereon; coating compositions for applying such a coating to a substrate; and methods for making such coatings.
Inventors
- 👤 Heinz-Juergen Hohage
- 👤 Rolf Neeb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:23
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C09D161/00; C09D161/20; C09D161/26; C09D161/28; C09D183/00; C09D183/04; C09D5/00; C09D5/006; C09D7/00; C09D7/40; C09D7/60; C09D7/61; C09D7/66; C09D7/69; C08K; C08K3/00; C08K3/34; C08K3/36; C08K7/00; C08K7/22; C08K7/24; C08K7/26; C08L; C08L61/00; C08L61/20; C08L83/00; C08L83/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/25; Y10T428/259; Y10T428/26; Y10T428/263; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A scratch resistant antireflecting coating having a refractive index differing from the value 1.45 by at least 0.01, said coating comprising a matrix film, from 1 to 40 microns thick, of (1) (a) an acrylate and/or methacrylate polymer, and/or (b) an organosilicon polymer, or (c) a melamine resin; and, in said matrix film, (2) from 0.1 to 10 percent, by weight of the coating, of amorphous, porous silica having a large pore volume from 0.1 to 5 ml/g and consisting of primary particles having an average diameter from 1 to 50 microns, at least 40 percent of the silica primary particles having an average diameter at least 10 percent greater than the thickness of the matrix film.
Claim 2
Dependent Claim
117 words
A scratch resistant antireflecting coating having a refractive index differing from the value 1.45 by at least 0.01, said coating comprising a matrix film, from 1 to 40 microns thick, of (1) (a) an acrylate and/or methacrylate polymer, and/or (b) an organosilicon polymer, or (c) a melamine resin; and, in said matrix film, (2) from 0.1 to 10 percent, by weight of the coating, of amorphous, porous silica having a large pore volume from 0.1 to 5 ml/g and consisting of primary particles having an average diameter from 1 to 50 microns, at least 40 percent of the silica primary particles having an average diameter at least 10 percent greater than the thickness of the matrix film.
Claim 3
Dependent Claim
19 words
A coating as in claim 1 wherein the packed density of said silica is from 120 to 350 g/l.
Claim 4
Dependent Claim
20 words
A coating as in claim 1 wherein said silica primary particles have an average diameter from 1 to 20 microns.
Claim 5
Dependent Claim
21 words
A coating as in claim 1 wherein said silica has a specific surface area from 300 to 900 m 2 /g.
Claim 6
Dependent Claim
31 words
A coating as in claim 1 wherein at least 50 percent of the silica primary particles have an average diameter at least 15 percent greater than the thickness of the coating.
Claim 7
Dependent Claim
15 words
A synthetic resin substrate having thereon a scratch resistant antireflecting coating as in claim 1.
Claim 8
Dependent Claim
13 words
A coated substrate as in claim 6 wherein said synthetic resin is transparent.
Claim 9
Dependent Claim
17 words
A coated substrate as in claim 7 wherein said synthetic resin is a polymer of methyl methacrylate.
Claim 10
Dependent Claim
29 words
A coating as in claim 1 wherein said polymer (1) (a) is crosslinked by the presence therein of 40 to 100 percent by weight of diacrylate and/or dimethacrylate esters.
Claim 11
Dependent Claim
11 words
A coating as in claim 1 comprising (b) an organosilicon polymer.
Claim 12
Dependent Claim
11 words
A coating as in claim 1 comprising (c) a melamine resin.
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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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |