US4758067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic optical fiber
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1985-05-24
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Granted: 1988-07-19
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Expires: 2005-05-24
Abstract
Abstract A plastic optical fiber comprising a core and a cladding, wherein the core is made a polymer comprising units of methyl methacrylate and of a methacrylate ester, the ester moiety of which has an alicyclic hydrocarbon of 8 to 20 carbon atoms, and the cladding is made of a fluorine-containing polymer comprising units of the formula: <IMAGE> (I) wherein R1 and R2 are each hydrogen or C1-C3 alkyl, Rf1 is fluorine or trifluoromethyl, an Rf2 is C2-C10 fluoroalkyl, which units (I) are derived from fluoroalkyl alpha -fluoroacrylate or trifluoromethacrylate, which has short- and long-time heat and humidity resistance as well as low attenuation of light transmission.
Inventors
- 👤 Yoshiharu Tatsukami
- 👤 Katsuramaru Fujita
- 👤 Motonobu Furuta
- 👤 Toshifumi Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:27
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/02033; G02B1/00; G02B1/04; G02B1/045; G02B1/046; G02B1/048; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A plastic optical fiber comprising a core and a cladding, wherein the core is made of a polymer comprising units of methyl methacrylate and units of a methacrylate ester, the ester moiety of which has an alicyclic hydrocarbon of from 8 to 20 carbon atoms, and the cladding is made of a fluorinecontaining polymer comprising units of the formula: ##STR3## wherein R 1 and R 2 are each hydrogen or C 1 -C 3 alkyl, R f1 is fluorine or trifluoromethyl, and R f2 is C 2 -C 10 fluoroalkyl, which units (I) are derived from fluoroalkyl α-fluoroacrylate or trifluoromethacrylate.
Claim 2
Dependent Claim
100 words
A plastic optical fiber comprising a core and a cladding, wherein the core is made of a polymer comprising units of methyl methacrylate and units of a methacrylate ester, the ester moiety of which has an alicyclic hydrocarbon of from 8 to 20 carbon atoms, and the cladding is made of a fluorinecontaining polymer comprising units of the formula: ##STR3## wherein R 1 and R 2 are each hydrogen or C 1 -C 3 alkyl, R f1 is fluorine or trifluoromethyl, and R f2 is C 2 -C 10 fluoroalkyl, which units (I) are derived from fluoroalkyl α-fluoroacrylate or trifluoromethacrylate.
Claim 3
Dependent Claim
45 words
The plastic optical fiber according to claim 1, wherein the methacrylate ester, the ester moiety of which has an alicyclic hydrocarbon from 8 to 20 carbon atoms is selected from the group consisting of bornyl methacrylate, fenchyl methacrylate, l-menthyl methacrylate, adamantyl methacrylate and dimethyladamantyl methacrylate.
Claim 4
Dependent Claim
22 words
The plastic optical fiber according to claim 1, wherein the core polymer comprises at least 70% by weight of methyl methacrylate units.
Claim 5
Dependent Claim
46 words
The plastic optical fiber according to claim 1, wherein the core polymer contains 3 to 40% by weight of the methacrylate ester, the ester moiety of which has an alicyclic hydrocarbon of from 8 to 20 carbon atoms based on the total weight of the core.
Claim 6
Dependent Claim
38 words
The plastic optical fiber according to claim 1, wherein α-fluoroacrylate or trifluoromethacrylate is selected from the group consisting of 1,1,1,3,3,3-hexafluoro-2-propyl α-fluoroacrylate, 1,1-diethyl-2,2,3,4,4,4-hexafluoro-1-butyl α-fluoroacrylate, 1-propyl-2,2,3,4,4,4-hexafluoro-1-butyl α-fluoroacrylate, 1,1-dimethyl-3-trifluoromethyl-2,2,4,4,4-pentafluorobutyl α-fluoroacrylate, 2-trifluoromethyl-2,2,3,3-tetrafluoropropyl α-fluoroacrylate, 2,2,3,3-tetrafluoropropyl α-fluoroacrylate, 1,1-dimethyl-2,2,3,3-tetrafluoropropyl α-fluoroacrylate, 2-trifluoromethyl-3,3,3-trifluoropropyl α-fluoroacrylate, and corresponding trifluoromethacrylates.
Claim 7
Dependent Claim
23 words
The plastic optical fiber according to claim 1, wherein the polymer of α-fluoroacrylate or trifluoromethacrylate has a refractive index not larger than 1.43.
Claim 8
Dependent Claim
22 words
The plastic optical fiber according to claim 1, wherein the core polymer comprises up to 10% by weight of an alkyl acrylate.
Claim 9
Dependent Claim
20 words
The plastic optical fiber according to claim 7, wherein the alkyl acrylate is methyl acrylate, ethyl acrylate or 2-ethylhexyl acrylate.
Claim 10
Dependent Claim
19 words
The plastic optical fiber according to claim 1, having a core and cladding ratio of from 70:30 to 98:2.
Claim 11
Dependent Claim
16 words
The plastic optical fiber according to claim 9, wherein the ratio is from 80:20 to 95:5.
Claim 12
Dependent Claim
19 words
The plastic optical fiber according to claim 1 having a diameter of from about 0.15 mm to 1.5 mm.
Claim 13
Dependent Claim
18 words
The plastic optical fiber according to claim 11, wherein the diameter is from about 0.20 to 1.0 mm.
Claim 14
Dependent Claim
22 words
The plastic optical fiber according to claim 1, wherein the plastic optical fiber is produced by co-extruding the core and the cladding.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |