US4693553A
Expired / Lapsed
US
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Light-transmitting fiber
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-02-26
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Granted: 1987-09-15
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Expires: 2005-02-26
Abstract
Abstract A plastic light-transmitting fiber having a core-sheath structure. A polymer having methacrylimide or N-substituted methacrylimide units is used for the core component. A polymer having a refractive index smaller by at least 1% than that of the polymer of the core component is used for the sheath component. The heat resistance of the light-transmitting fiber is highly improved.
Inventors
- 👤 Isao Sasaki
- 👤 Kozi Nishida
- 👤 Masaru Morimoto
- 👤 Takashi Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:58
CPC Classifications
G; G02; G02B; G02B6/00; G02B1/00; G02B1/04; G02B1/045; G02B1/046
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A light-transmitting fiber comprising a core component and a sheath component covering the core component, the core component consisting essentially of a polymer comprising 2% to 100% by weight of ring structure units represented by the following general formula (I): ##STR3## wherein R stands for a hydrogen atom or an aliphatic, alicyclic, or aromatic hydrocarbon group having 1 to 20 carbon atoms, and 0% to 98% by weight of monomer units composed mainly of methyl methacrylate, and the sheath component being composed of a polymer having a refractive index smaller by at least 1% than that of the polymer of the core component.
Claim 2
Dependent Claim
103 words
A light-transmitting fiber comprising a core component and a sheath component covering the core component, the core component consisting essentially of a polymer comprising 2% to 100% by weight of ring structure units represented by the following general formula (I): ##STR3## wherein R stands for a hydrogen atom or an aliphatic, alicyclic, or aromatic hydrocarbon group having 1 to 20 carbon atoms, and 0% to 98% by weight of monomer units composed mainly of methyl methacrylate, and the sheath component being composed of a polymer having a refractive index smaller by at least 1% than that of the polymer of the core component.
Claim 3
Dependent Claim
24 words
A light-transmitting fiber as set forth in claim 1, wherein the core component contains at least 10% by weight of the ring structure units.
Claim 4
Dependent Claim
24 words
A light-transmitting fiber as set forth in claim 1, wherein the polymer of the core component is drawn by at least 10% after spinning.
Claim 5
Dependent Claim
26 words
A light-transmitting fiber as set forth in claim 1, wherein the polymer of the core component has a heat distortion temperature of at least 110° C.
Claim 6
Dependent Claim
26 words
A light-transmitting fiber as set forth in claim 1, wherein its thermal shrinkage factor after 1 hour's heat treatment at 130° C. is smaller than 5%.
Claim 7
Dependent Claim
31 words
A light-transmitting fiber as set forth in claim 1, wherein R in the general formula (I) is a hydrogen atom or an aliphatic hydrocarbon group having 1 to 4 carbon atoms.
Claim 8
Dependent Claim
25 words
A light-transmitting fiber as set forth in claim 6, wherein the aliphatic hydrocarbon group is selected from methyl, ethyl, propyl, isopropyl, butyl, isobutyl, and tert-butyl.
Claim 9
Dependent Claim
27 words
A light-transmitting fiber as set forth in claim 1, wherein R in the general formula (I) is an aromatic hydrocarbon group having 6 to 10 carbon atoms.
Claim 10
Dependent Claim
21 words
A light-transmitting fiber as set forth in claim 8, wherein the aromatic hydrocarbon group is selected from phenyl and substituted phenyl.
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) | 1990-09-14 | 1991-03-16 | 1991-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-14 | 1995-03-16 | 1995-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-14 | 1999-03-16 | 1999-09-15 | $7700.00 | Window Closed / Lapsed |