US4683169A
Expired / Lapsed
US
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Methyl methacrylic coatings on thermoplastic film
Assignee: General Electric Co
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Filing: 1985-11-04
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Granted: 1987-07-28
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Expires: 2005-11-04
Abstract
Abstract Methyl methacrylic UV protective coatings for polycarbonate film are disclosed with improved resistance to microcracking.
Inventors
- 👤 Herbert L. Curry
- 👤 Earl T. Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:31
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J2369/00; C08J2433/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A UV stable article comprising a film substrate of polycarbonate having a thickness of from about 1 to about 60 mils, and a microcrack resistant protective external coat comprising a copolymer consisting essentially of: (a) methyl methacrylate units, (b) from about 1/2 percent up to about 10 percent by number of other methacrylate units selected from the group consisting of ethyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, or mixtures thereof, and (c) from 0 percent up to 5 percent by number of other alpha-beta ethylenically unsaturated units; wherein said units are combined in such ratio to result in a copolymer material having a tensile elongation at break of greater than about 3.5 percent and a glass transition temperature greater than about 87° C.
Claim 2
Dependent Claim
122 words
A UV stable article comprising a film substrate of polycarbonate having a thickness of from about 1 to about 60 mils, and a microcrack resistant protective external coat comprising a copolymer consisting essentially of: (a) methyl methacrylate units, (b) from about 1/2 percent up to about 10 percent by number of other methacrylate units selected from the group consisting of ethyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, or mixtures thereof, and (c) from 0 percent up to 5 percent by number of other alpha-beta ethylenically unsaturated units; wherein said units are combined in such ratio to result in a copolymer material having a tensile elongation at break of greater than about 3.5 percent and a glass transition temperature greater than about 87° C.
Claim 3
Dependent Claim
20 words
The article of claim 1 wherein said film substrate has a thickness of from about 5 to about 30 mils.
Claim 4
Dependent Claim
14 words
The article of claim 1 wherein said other methacrylate units are ethyl methacrylate units.
Claim 5
Dependent Claim
13 words
The article of claim 1 wherein said other unsaturated units are polyethylene units.
Claim 6
Dependent Claim
110 words
A UV stable article comprising a film substrate of polycarbonate having a thickness of from about 1 to about 60 mils and a microcrack resistant protective external coat comprising a copolymer consisting essentially of: (a) methyl methacrylate units, (b) from about 1/2 percent up to about 10 percent by number ethyl methacrylate units, and (c) from 0 percent up to 5 percent by number of other alpha-beta ethylenically unsaturated units; wherein said units are combined in such ratio to result in a copolymer material having a tensile elongation at break (23° C., 50 percent RH) of greater than 3.5 percent and a glass transition temperature greater than about 87° C.
Claim 7
Dependent Claim
110 words
A UV stable article comprising a film substrate of polycarbonate having a thickness of from about 1 to about 60 mils and a microcrack resistant protective external coat comprising a copolymer consisting essentially of: (a) methyl methacrylate units, (b) from about 1/2 percent up to about 10 percent by number ethyl methacrylate units, and (c) from 0 percent up to 5 percent by number of other alpha-beta ethylenically unsaturated units; wherein said units are combined in such ratio to result in a copolymer material having a tensile elongation at break (23° C., 50 percent RH) of greater than 3.5 percent and a glass transition temperature greater than about 87° C.
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) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |