US4836642A
Expired / Lapsed
US
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Cladding material for optical fiber
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-07-29
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Granted: 1989-06-06
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Expires: 2008-07-29
Abstract
Abstract A cladding material for an optical fiber is described, which is made of a polymer comprised of (A) 10-90 wt. % of a long-chain fluoroalkyl group-containing monomer of the formula: ##STR1## wherein F is F, CH 3 or CF 3 , and n is an integer from 5 to 11, (B) 5-90 wt. % of a short-chain fluoroalkyl group-containing monomer of the formula: ##STR2## wherein Y is as defined above, X is F, CH 3 or CF 3 , and m is an integer of from 1 to 4, and (C) 0-50 wt. % of other copolymerizable monomer. The melt flow index indicating the amount in gram of the polymer extruded for 10 minutes from a nozzle with an orifice having an inner diameter of 2 mm and a length of 8 mm under the conditions of a temperature of 230° C. and a load of 5 kg, is not larger than 30.
Inventors
- 👤 Tsuruyoshi Matsumoto
- 👤 Katsuhiko Shimada
- 👤 Yoshihiro Uozu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:47
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; D; D01; D01F; D01F8/00; D01F8/04; D01F8/10; C; C03; C03C; C03C25/00; C03C25/10; C03C25/104; C03C25/105; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
165 words
A cladding material for an optical fiber, which consists essentially of a fluorine-containing polymer comprising (A) 10 to 90% by weight of a long-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR10## wherein Y if F, CH 3 or CF 3 , and n is an integer from 5 to 11, (B) 5 to 90% by weight of a short-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR11## wherein Y is as defined above, X is F, CH 3 or CF 3 , and m is an integer of from 1 to 4. and (C) 0 to 50% by weight of other copolymerizable monoethylenically unsaturated monomer, wherein the melt flow index indicating the amount in gram of the polymer extruded for 10 minutes from a nozzle with an orifice having an inner diameter of 2 mm and a length of 8 mm under conditions of a temperature of 230° C. and a load of 5 kg, is not larger than 30.
Claim 2
Dependent Claim
165 words
A cladding material for an optical fiber, which consists essentially of a fluorine-containing polymer comprising (A) 10 to 90% by weight of a long-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR10## wherein Y if F, CH 3 or CF 3 , and n is an integer from 5 to 11, (B) 5 to 90% by weight of a short-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR11## wherein Y is as defined above, X is F, CH 3 or CF 3 , and m is an integer of from 1 to 4. and (C) 0 to 50% by weight of other copolymerizable monoethylenically unsaturated monomer, wherein the melt flow index indicating the amount in gram of the polymer extruded for 10 minutes from a nozzle with an orifice having an inner diameter of 2 mm and a length of 8 mm under conditions of a temperature of 230° C. and a load of 5 kg, is not larger than 30.
Claim 3
Dependent Claim
22 words
A cladding material as set forth in claim 1, wherein the melt flow index of the fluorine-containing polymer is 2 to 25.
Claim 4
Dependent Claim
24 words
A cladding material as set forth in claim 1 or 2, wherein the fluorine-containing polymer has an intrinsic viscosity of at least 0.4 dl/g.
Claim 5
Dependent Claim
40 words
A cladding material as set forth in claim 1 of 3, wherein the fluorine-containing polymer has a glass transition temperature of at least 50° C. as determined from the peak value of E" obtained by the measurement of the viscoelasticity.
Claim 6
Dependent Claim
50 words
A cladding material as set forth in claim 1, wherein the fluorine-containing polymer comprises (A) 10 to 70% by weight of the long-chain fluoroalkyl group-containing monomer, (B) 10 to 90% by weight of the short-chain fluoroalkyl group-containing monomer, and (C) 0 to 50% by weight of the monoethylenically unsaturated monomer.
Claim 7
Dependent Claim
33 words
A cladding material as set forth in claim 1 or 3, wherein the other copolymerizable monoethylenically unsaturated monomer (C) is methyl metachrylate and the copolymerization ratio thereof is 0.1 to 20% by weight.
Claim 8
Dependent Claim
35 words
A cladding material as set forth in claim 1 or 3, wherein the other copolymerizable monoethylenically unsaturated monomer (C) is an unsaturated carboxylic acid and the copolymerization ratio thereof is 0.1 to 10% by weight.
Claim 9
Dependent Claim
18 words
a cladding material as set forth in claim 7, wherein the unsaturated carboxylic acid (C) is methacrylic acid.
Claim 10
Dependent Claim
104 words
A core-clad optical fiber in which the light transmittance retention ratio Ia/Io when wound satisfies the requirement represented by the following formula: Ia/Io×100≧20% wherein Io stands for the intensity of transmitted light measured when parallel light having a specific wavelength is made incident from one end of the optical fiber having a length of 10 m and emitted from the other end thereof, and Ia stands for the intensity of transmitted light obtained when the optical fiber is wound by 100 turns on a rod-shaped mandrel having a diameter of 10 mm and the measurement is conducted in the same manner as described above.
Claim 11
Dependent Claim
104 words
A core-clad optical fiber in which the light transmittance retention ratio Ia/Io when wound satisfies the requirement represented by the following formula: Ia/Io×100≧20% wherein Io stands for the intensity of transmitted light measured when parallel light having a specific wavelength is made incident from one end of the optical fiber having a length of 10 m and emitted from the other end thereof, and Ia stands for the intensity of transmitted light obtained when the optical fiber is wound by 100 turns on a rod-shaped mandrel having a diameter of 10 mm and the measurement is conducted in the same manner as described above.
Claim 12
Dependent Claim
172 words
A core-clad optical fiber as set forth in claim 9, wherein the sheath consists essentially of a fluorine-containing polymer comprising (A) 10 to 90% by weight of a long-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR12## wherein Y is F, CF 3 or CF 3 , and n is an integer of from 5 to 11, (B) 5 to 90% by weight of a short-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR13## wherein Y is as defined above, X is F, CH 3 or CF 3 , and m is an integer of from 1 to 4, and (C) 0 to 50% by weight of other copolymerizable monoethylenically unsaturated monomer, and the melt flow index indicating the amount in gram of the polymer extruded for 10 minutes from a nozzle with an orifice having an inner diameter of 2 mm and a length of 8 mm under the conditions of a temperature of 230° C. and a load of 5 kg, is not larger than 30.
Claim 13
Dependent Claim
23 words
A core-clad optical fiber as set forth in claim 10, wherein the fluorine-containing polymer has an intrinsic viscosity of at least 0.4 dl/g.
Claim 14
Dependent Claim
39 words
A core-clad optical fiber as set forth in claim 10, wherein the fluorine-containing polymer has a glass transition temperature of at least 50° C. as determined from the peak value of E" obtained by the measurement of the viscoelasticity.
Claim 15
Dependent Claim
51 words
A core-clad optical fiber as set forth in claim 10, wherein the fluorine-containing polymer comprises (A) 10 to 70% by weight of the long-chain fluoroalkyl group-containing monomer, (B) 10 to 90% by weight of the short-chain fluoroalkyl group-containing monomer, and (C) 0 to 50% by weight of the monoethylenically unsaturated monomer.
Claim 16
Dependent Claim
26 words
A core-clad optical fiber as set forth in claim 10, wherein the other copolymerizable monoethylenically unsaturated monomer (C) is methyl methacrylate or an unsaturated carboxylic acid.
Claim 17
Dependent Claim
81 words
A core-clad optical fiber as set forth in claim 8, wherein the light transmittance recovery ratio Ib/Io when unwound satisfies the requirement represented by the following formula: Ib/Io×100≧80% wherein Io is as defined in claim 8, and Ib stands for the intensity of transmitted light measured when the optical fiber wound in the same manner as set forth in claim 8 is unwound from the mandrel and the measurement is conducted in the same manner as set forth in claim 8.
Claim 18
Dependent Claim
172 words
A core-clad optical fiber as set forth in claim 13, wherein the clad consists essentially of a fluorine-containing polymer comprising (A) 10 to 90% by weight of a long-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR14## wherein Y is F, CH 3 or CF 3 , and n is an integer of from 5 to 11, (B) 5 to 90% by weight of a short-chain fluoroalkyl group-containing monomer represented by the following general formula: ##STR15## wherein Y is as defined above, X is F, CH 3 or CF 3 , and m is an integer of from 1 to 4, and (C) 0 to 50% by weight of other copolymerizable monoethylenically unsaturated monomer, and the melt flow index indicating the amount in gram of the polymer extruded for 10 minutes from a nozzle with an orifice having an inner diameter of 2 mm and a length of 8 mm under the conditions of a temperature of 230° C. and a load of 5 kg, is not larger than 30.
Claim 19
Dependent Claim
23 words
A core-clad optical fiber as set forth in claim 16, wherein the fluorine-containing polymer has an intrinsic viscosity of at least 0.4 dl/g.
Claim 20
Dependent Claim
39 words
A core-clad optical fiber as set forth in claim 16, wherein the fluorine-containing polymer has a glass transition temperature of at least 50° C. as determined from the peak value of E" obtained by the measurement of the viscoelasticity.
Claim 21
Dependent Claim
51 words
A core-clad optical fiber as set forth in claim 16, wherein the fluorine-containing polymer comprises (A) 10 to 70% by weight of the long-chain fluoroalkyl group-containing monomer, (B) 10 to 90% by weight of the short-chain fluoralkyl group-containing monomer, and (C) 0 to 50% by weight of the monoethylenically unsaturated monomer.
Claim 22
Dependent Claim
26 words
A core-clad optical fiber as set forth in claim 16, wherein the other copolymerizable monoethylenically unsaturated monomer (C) is methyl methacrylate or an unsaturated carboxylic acid.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |