Patent US4629637A successfully refreshed from Google Patents.
US4629637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated optically isotropic or monoaxially film of plastic
Assignee: Bayer AG
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Filing: 1985-04-18
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Granted: 1986-12-16
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Expires: 2005-04-18
Abstract
Abstract Optically monoaxial film of plastic which is coated with a product formed by hardening a mixture of a prepolymer, containing at least two (meth)acryloyl groups, and a (meth)acrylic acid ester of a monohydric or polyhydric aliphatic alcohol and/or an aliphatic vinyl compound, and the use of this film in liquid crystal visual displays.
Inventors
- 👤 Werner Waldenrath
- 👤 Hans-Leo Weber
- 👤 Uwe Claussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:18
CPC Classifications
C; C08; C08F; C08F299/00; C08F299/02; C08F299/022; C08F299/024; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/048; C09; C09D; C09D4/00; C09D4/06; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/133305; C08J2367/00; C08J2369/00; C08J2433/00; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/30; C09K19/3001; C09K19/3003; C09K2019/3009; C09K2019/3016; C09K2323/00; C09K2323/05; C09K2323/057; Y; Y10; Y10S; Y10S428/00; Y10S428/906; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
An optically isotropic or monoaxial film of a polymer selected from the group consisting of polyaryl sulphone, a polyacrylate, polymethacrylate, polycarbonate or of a mixture or copolymer containing such polymer, the film being coated with a product formed by hardening under electron beams a mixture of (a) a prepolymer and (b) a (meth)acrylic acid ester of a polyhydric aliphatic alcohol and/or N-vinylpyrrolidone, the prepolymer (a) containing two to five (meth)acryloyl groups and being derived from a polyether or polyurethane.
Claim 2
Dependent Claim
79 words
An optically isotropic or monoaxial film of a polymer selected from the group consisting of polyaryl sulphone, a polyacrylate, polymethacrylate, polycarbonate or of a mixture or copolymer containing such polymer, the film being coated with a product formed by hardening under electron beams a mixture of (a) a prepolymer and (b) a (meth)acrylic acid ester of a polyhydric aliphatic alcohol and/or N-vinylpyrrolidone, the prepolymer (a) containing two to five (meth)acryloyl groups and being derived from a polyether or polyurethane.
Claim 3
Dependent Claim
16 words
A film according to claim 1, wherein the prepolymer (a) contains 2,3 or 4 (meth)acryloyl groups.
Claim 4
Dependent Claim
48 words
A film according to claim 1, wherein (b) is selected from the group consisting of ethylene glycol di(meth)acrylate,; a di(meth)acrylate of diethylene glycol, triethylene glycol, tetraethylene glycol or pentaethylene glycol; propylene glycol di(meth)acrylate; a di(meth)acrylate of di-to pentapropylene glycol; neopentyl di(meth)acrylate; butane-1,4-diol di(meth)acrylate; hexane-1,6-diol di(meth)acrylate; and trimethylolpropane tri(meth)acrylate.
Claim 5
Dependent Claim
14 words
A film according to claim 1, wherein the polymer of the film is polycarbonate.
Claim 6
Dependent Claim
29 words
A film according to claim 1 wherein the polymer of the film by weight comprises 60 to 90% of linear polyaryl sulphone and 40 to 10% of linear polycarbonate.
Claim 7
Dependent Claim
12 words
A liquid crystal visual display containing a film according to claim 1.
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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |