US5146535A
Expired / Lapsed
US
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Light-transmitting fiber
Assignee: Mitsubishi Chemical Corp
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Filing: 1991-04-15
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Granted: 1992-09-08
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Expires: 2011-04-15
Abstract
Abstract A light-transmitting plastic fiber comprising, as a core component, a methacrylimide group-containing polymer prepared by polymerizing methyl methacrylate in the absence of a chain transfer agent and then imidizing the methyl methacrylate polymer thus prepared, and another polymer as a sheath component.
Inventors
- 👤 Hisao Anzai
- 👤 Isao Sasaki
- 👤 Kozi Nishida
- 👤 Hideaki Makino
- 👤 Masami Ohtani
- 👤 Katsuhiko Shimada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/48; B; B29; B29C; B29C48/00; B29C48/03; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A light-transmitting fiber comprising a polymer as a core component and a polymer having a refractive index smaller than that of the core component as a sheath component, wherein the core component is a methacrylimide group-containing polymer prepared by a process comprising polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a chain transfer agent and then reaction the thus-prepared polymer with a compound represented by the following general formula: R--NH.sub.2 wherein R stands for H, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 7 to 11 carbon atoms or an aryl group having 6 to 10 carbon atoms, in the presence of a mixed solvent comprising methanol and a solvent having a solubility parameter δ of 8.5 to 13.9 (cal/cm 3 ) 1/2 .
Claim 2
Dependent Claim
145 words
A light-transmitting fiber comprising a polymer as a core component and a polymer having a refractive index smaller than that of the core component as a sheath component, wherein the core component is a methacrylimide group-containing polymer prepared by a process comprising polymerizing methacrylic acid, a methacrylic acid ester, or a monomer mixture predominantly comprised of methacrylic acid or an ester thereof in the absence of a chain transfer agent and then reaction the thus-prepared polymer with a compound represented by the following general formula: R--NH.sub.2 wherein R stands for H, an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 7 to 11 carbon atoms or an aryl group having 6 to 10 carbon atoms, in the presence of a mixed solvent comprising methanol and a solvent having a solubility parameter δ of 8.5 to 13.9 (cal/cm 3 ) 1/2 .
Claim 3
Dependent Claim
53 words
The light-transmitting fiber according to claim 1, wherein methacrylic acid, a methacrylic acid ester or the monomer mixture is polymerized in the presence of 10 to 60% by weight of an inert solvent, based on the total weight of the inert solvent and the methacrylic acid, methacrylic acid ester or the monomer mixture.
Claim 4
Dependent Claim
27 words
The light-transmitting fiber according to claim 1, wherein the solvent having a solubility parameter δ of 8.5 to 13.9 (cal/cm 3 ) 1/2 is an aromatic hydrocarbon.
Claim 5
Dependent Claim
26 words
The light-transmitting fiber according to claim 1, wherein the imidation reaction is carried out in an imidation reaction zone where the reaction mixture is thoroughly stirred.
Claim 6
Dependent Claim
30 words
The light-transmitting fiber according to claim 4, wherein the imidation reaction is carried out in a continuous manner and in an imidation reaction zone having at least two divided sections.
Claim 7
Dependent Claim
22 words
The light-transmitting fiber according to claim 1, wherein the imidation reaction is carried out at a temperature of 180° to 250° C.
Claim 8
Dependent Claim
36 words
The light-transmitting fiber according to claim 1, wherein the polymerization of methacrylic acid or the ester thereof or the monomer mixture and the imidation reaction of the obtained polymer are carried out in a continuous manner.
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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) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |