Patent US4617191A successfully refreshed from Google Patents.
EP0331056A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fluorine-containing copolymer and process for preparing the same
Assignee: Daikin Industries Ltd
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Filing: 1989-02-25
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Granted: —
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Expires: 2009-02-25
Abstract
Abstract The invention provides: a fluorine-containing copolymer comprising methyl methacrylate and at least one long-chain fluoroalkyl methacrylate and having a light transmittance of about 90% or more; a method of preparing the copolymer; and an optical fiber using the copolymer as the cladding material.
Inventors
- 👤 Hiroshi Inukai
- 👤 Takahiro Kitahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:41
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/22; C08F220/24; G; G02; G02B; G02B1/00; G02B1/04; G02B1/045; G02B1/048
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
23 words
A fluorine-containing copolymer comprising methyl methacrylate and at least one long-chain fluoroalkyl methacrylate and having a light transmittance of about 90% or more.
Claim 2
Dependent Claim
23 words
A fluorine-containing copolymer comprising methyl methacrylate and at least one long-chain fluoroalkyl methacrylate and having a light transmittance of about 90% or more.
Claim 3
Dependent Claim
49 words
A fluorine-containing copolymer having a light transmittance of 90% or more and comprising: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, and (b) about 5 to about 50% by weight of methyl methacrylate
Claim 4
Dependent Claim
49 words
A fluorine-containing copolymer having a light transmittance of 90% or more and comprising: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, and (b) about 5 to about 50% by weight of methyl methacrylate
Claim 5
Dependent Claim
104 words
A fluorine-containing copolymer having a light transmittance of 90% or more and comprising: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, (b) about 5 to about 50% by weight of methyl methacrylate, and (c) 0 to about 40% by weight of at least one of fluoroalkyl methacrylate represented by the formula wherein X and X′ each independently represent hydrogen atom, methyl group or ethyl group, Y is hydrogen atom or fluorine atom and m is an integer of 4 to 10, and fluoroalkyl methacrylate represented by the formula
Claim 6
Dependent Claim
104 words
A fluorine-containing copolymer having a light transmittance of 90% or more and comprising: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, (b) about 5 to about 50% by weight of methyl methacrylate, and (c) 0 to about 40% by weight of at least one of fluoroalkyl methacrylate represented by the formula wherein X and X′ each independently represent hydrogen atom, methyl group or ethyl group, Y is hydrogen atom or fluorine atom and m is an integer of 4 to 10, and fluoroalkyl methacrylate represented by the formula
Claim 7
Dependent Claim
20 words
A material for forming a cladding for optical fibers which material is the fluorine-containing copolymer as defined in claim 1.
Claim 8
Dependent Claim
20 words
A material for forming a cladding for optical fibers which material is the fluorine-containing copolymer as defined in claim 2.
Claim 9
Dependent Claim
20 words
A material for forming a cladding for optical fibers which material is the fluorine-containing copolymer as defined in claim 3.
Claim 10
Independent Claim
56 words
A method for preparing a fluorine-containing copolymer, the method being characterized in that a solvent capable of dissolving the resulting copolymer is used in an amount of about 0.1 to about 20 parts by weight per 100 parts by weight of the total monomers in copolymerization of methyl methacrylate and at least one long-chain fluoroalkyl methacrylate.
Claim 11
Independent Claim
56 words
A method for preparing a fluorine-containing copolymer, the method being characterized in that a solvent capable of dissolving the resulting copolymer is used in an amount of about 0.1 to about 20 parts by weight per 100 parts by weight of the total monomers in copolymerization of methyl methacrylate and at least one long-chain fluoroalkyl methacrylate.
Claim 12
Dependent Claim
50 words
A method according to claim 7 wherein a fluorine-containing copolymer is prepared which comprises: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, and (b) about 5 to about 50% by weight of methyl methacrylate.
Claim 13
Dependent Claim
105 words
A method according to claim 7 wherein a fluorine-containing copolymer is prepared which comprises: (a) about 50 to about 95% by weight of fluoroalkyl methacrylate represented by the formula wherein n is an integer of 6 to 10, (b) about 5 to about 50% by weight of methyl methacrylate, and (c) 0 to about 40% by weight of at least one of fluoroalkyl methacrylate represented by the formula wherein X and X′ each independently represent hydrogen atom, methyl group or ethyl group, Y is hydrogen atom or fluorine atom and m is an integer of 4 to 10, and fluoroalkyl methacrylate represented by the formula
Claim 14
Dependent Claim
17 words
A method according to claim 7 wherein the solvent capable of dissolving the copolymer is metaxylene hexafluoride.
Claim 15
Dependent Claim
21 words
In an optical fiber comprising a cladding and core, the improvement wherein said cladding comprises a fluorine-containing copolymer of claim 1.
Claim 16
Dependent Claim
21 words
In an optical fiber comprising a cladding and core, the improvement wherein said cladding comprises a fluorine-containing copolymer of claim 2.
Claim 17
Dependent Claim
21 words
In an optical fiber comprising a cladding and core, the improvement wherein said cladding comprises a fluorine-containing copolymer of claim 3.
References Cited (Backward Citations)
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