Claims
- 1. An ultraviolet ray-curable cladding composition for a plastic clad silica or glass core optical fiber, which consists essentially of (A) a fluorinated monofunctional acrylate or .alpha.-fluoroacrylate composition consisting essentially of a highly fluorinated monofunctional acrylate or .alpha.-fluoroacrylate represented by the following formula (I): ##STR13## wherein Y represents H or F, X represents H or F, l is an integer of from 1 to 12 and n is an integer of from 5 to 12, and a lowly fluorinated monofunctional acrylate or .alpha.-fluoroacrylate represented by the following formula (II): ##STR14## wherein X and Y are as defined above, and m is an integer of from 1 to 3, at a compound (I)/compound (II) weight ratio of from 2/98 to 60/40, (B) polyfunctional acrylate or .alpha.-fluoroacrylate having at least two acryloyl or .alpha.-fluoroacryloyl radicals in the molecule and (C) a photoinitiator, the refractive index of the cured product of said cladding composition satisfying (n.sub.1 -n.sub.2)>0.01, wherein n.sub.1 and n.sub.2 are the refractive indices of said core optical fiber and said cured cladding composition, respectively.
- 2. A cladding composition as set forth in claim 1, which comprises 50 to 98% by weight of the fluorinated monofunctional acrylate or .alpha.-fluoroacrylate composition, 1 to 20% by weight of the polyfunctional acrylate or .alpha.-fluoroacrylate (B) and 0.1 to 10% by weight of the photoinitiator (C).
- 3. A cladding composition as set forth in claim 1 or 2, wherein the fluorinated monofunctional acrylate or .alpha.-fluoroacrylate composition comprises a highly fluorinated monofunctional acrylate or .alpha.-fluoroacrylate of the formula (I) in which n is an integer of from 7 to 10 and a lowly fluorinated monofunctional acrylate or 6 -fluoroacryalte of the formula (II) in which m is 1 or 2.
- 4. A cladding composition as set forth in claim 1 which further contains at least one stabilizer selected from the group consisting of thiodicarboxylic acid diesters and hindered phenols.
- 5. A cladding composition as set forth in claim 4, wherein the stabilizer is dilauryl thiodipropionate.
- 6. A cladding composition as set forth in claim 1, wherein the fluorinated monofunctional acrylate or .alpha.-fluoroacrylate composition comprises a highly fluorinated monofunctional acrylate or .alpha.-fluoroacrylate of the formula (I) in which n is an integer of from 7 to 10 and X is F, and a lowly fluorinated monofunctional acrylate or .alpha.-fluoroacrylate of the formula (II) in which m is 1 or 2 and X is F.
- 7. A cladding composition as set forth in claim 1, wherein the polyfunctional acrylate is an alkylene glycol diacrylate.
- 8. A cladding composition as set forth in claim 7, wherein the alkylene glycol diacrylate is hexaethylene glycol diacrylate.
- 9. An ultraviolet ray-curable cladding composition as set forth in claim 1 having a compound (I)/compound (II) ratio of 5/95 to 50/50.
- 10. An ultraviolet ray-curable cladding composition as set forth in claim 1 wherein in formula (I) n is 8 and in formula (II) m is 2.
Priority Claims (4)
Number |
Date |
Country |
Kind |
61-183342 |
Aug 1986 |
JPX |
|
62-41379 |
Feb 1987 |
JPX |
|
62-41380 |
Feb 1987 |
JPX |
|
62-82704 |
Apr 1987 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/081,759, filed Aug. 5, 1987 now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0128516 |
Jun 1984 |
EPX |
2252586 |
Nov 1974 |
FRX |
147010 |
Aug 1984 |
JPX |
0090855 |
May 1985 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
81759 |
Aug 1987 |
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