US4801186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated optical fiber, fabrication process thereof and fabrication apparatus thereof
Assignee: NTT Inc
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Filing: 1985-01-17
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Granted: 1989-01-31
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Expires: 2005-01-17
Abstract
Abstract A coated optical fiber comprising an optical fiber; a first layer of a thermoplastic rubber composition which is disposed around the circumference of the optical fiber, has a Young's modulus of 0.1 GPa or less, and is capable of extrusion coating; and a second layer of a thermoplastic resin composition which is disposed around the circumference of the first layer, has a linear expansion coefficient of 1x10-5 DEG C.-1 or less and a Young's modulus of 5 GPa or more, and is capable of extrusion coating. The coated optical fiber has excellent transmission characteristics at low and high temperatures and is inexpensive.
Inventors
- 👤 Makoto Wagatsuma
- 👤 Fumio Yamamoto
- 👤 Takao Kimura
- 👤 Yoshito Shuto
- 👤 Shinzo Yamakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:26
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/12; C03C25/18; C03C25/104; C03C25/1065; G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29C48/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A coated optical fiber comprising: an optical fiber; a first layer of a thermoplastic rubber composition which is disposed around the circumference of said optical fiber, has a Young's modulus of 0.1 GPa or less, and is capable of extrusion coating, the thermoplastic rubber composition of said first layer comprising a styrene/butadiene block copolymer containing 20-40% by weight of styrene, a naphthenic processing oil, and a heat stabilizer as the major components, each amount of said naphthenic processed oil and said heat stabilizer being 5-150 parts by weight and 0.5-5 parts by weight, respectively, with respect to 100 parts by weight of said styrene/butadiene block copolymer; and a second layer of a thermoplastic resin composition which is disposed around the circumference of said first layer, has a linear expansion coefficient of 1×10 -5 °C. -1 or less and a Young's modulus of 5 GPa or more, and is capable of extrusion coating.
Claim 2
Dependent Claim
152 words
A coated optical fiber comprising: an optical fiber; a first layer of a thermoplastic rubber composition which is disposed around the circumference of said optical fiber, has a Young's modulus of 0.1 GPa or less, and is capable of extrusion coating, the thermoplastic rubber composition of said first layer comprising a styrene/butadiene block copolymer containing 20-40% by weight of styrene, a naphthenic processing oil, and a heat stabilizer as the major components, each amount of said naphthenic processed oil and said heat stabilizer being 5-150 parts by weight and 0.5-5 parts by weight, respectively, with respect to 100 parts by weight of said styrene/butadiene block copolymer; and a second layer of a thermoplastic resin composition which is disposed around the circumference of said first layer, has a linear expansion coefficient of 1×10 -5 °C. -1 or less and a Young's modulus of 5 GPa or more, and is capable of extrusion coating.
Claim 3
Dependent Claim
33 words
A coated optical fiber as claimed in claim 1, wherein the thermoplastic rubber composition of said first layer contains a copolymer selected form the group consisting of styrene copolymer and an olefine copolymer.
Claim 4
Dependent Claim
32 words
A coated optical fiber as claimed in claim 1, wherein the thermoplastic resin composition of said second layer comprises a resin exhibiting liquid crystallizability in the molten state as the major component.
Claim 5
Dependent Claim
77 words
A coated optical fiber as claimed in claim 1, wherein the thermoplastic resin composition of said second layer is composed of a copolymer selected from the group consisting of a polyethylene terephthalate-p-hydroxybenzoic acid copolymer containing 40-70 mol % of p-hydroxybenzoic acid and a blend of said copolymer and another polymer, and said resin composition presents a molecular orientation in the lengthwise direction of the fiber at a rate of shear of 10 2 sec -1 or more.
Claim 6
Dependent Claim
98 words
A coated optical fiber comprising: a glass fiber having a light waveguide structure; a first layer of a thermoplastic rubber composition formed around the circumference of said glass fiber, the thermoplastic rubber composition of said first layer comprising: A: a styrene/butadiene block copolymer (20-40 wt % styrene concentration) B: a naphthenic processing oil, and C: a heat stabilizer, as the major components, concentrations of the respective components of said composition being so determined that ##EQU2## a second layer of a thermoplastic resin composition exhibiting liquid crystallizability in the molten state formed around the circumference of said first layer.
Claim 7
Dependent Claim
98 words
A coated optical fiber comprising: a glass fiber having a light waveguide structure; a first layer of a thermoplastic rubber composition formed around the circumference of said glass fiber, the thermoplastic rubber composition of said first layer comprising: A: a styrene/butadiene block copolymer (20-40 wt % styrene concentration) B: a naphthenic processing oil, and C: a heat stabilizer, as the major components, concentrations of the respective components of said composition being so determined that ##EQU2## a second layer of a thermoplastic resin composition exhibiting liquid crystallizability in the molten state formed around the circumference of said first layer.
Claim 8
Dependent Claim
34 words
A coated optical fiber as claimed in claim 5, wherein the thermoplastic rubber composition of said first layer contains a copolymer selected from the group consisting of a styrene copolymer and an ethylene-α-olefine copolymer.
Claim 9
Dependent Claim
44 words
A coated optial fiber as claimed in claim 5, wherein the thermoplastic resin composition of said second layer is selected from the group consisting of all aromatic polyesters, aromatic-fatty polyesters, all aromatic polyester amides, aromatic-aliphatic polyester amides, aromatic polyazomethines, aromatic polyester-carbonates and mixtures thereof.
Claim 10
Dependent Claim
78 words
A coated optical fiber as claimed in claim 5, wherein the thermoplastic resin composition of said second layer is composed of a copolymer selected form the group consisting of a polyethylene terephthalate-p-hydroxybenzoic acid copolymer containing 40-70 mol % of p-hydroxybenzoic acid and a blend prepared from said copolymer and another polymer, and said resin composition prepsents a molecular orientation in the lengthwise direction of the fiber at a rate of shear of 10 2 sec -1 or more.
Claim 11
Dependent Claim
48 words
A coated optical fiber as claimed in claim 5, wherein the thermoplastic resin composition of said second layer is selected from the group consisting of mixtures of all aromatic polyester, aromatic-fatty polyesters, all aromatic polyester amides, aromatic-aliphatic polyester amides, aromatic polyazomethines and aromatic polyester-carbonates with other high-molecular materials.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |