Method for producing optical fiber having formyl groups on core surface thereof
First Claim
1. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the step of immersing the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, in a treating solution containing from 0.5 to 40 mM alkali metal hydroxide and a compound having formyl groups, in water or lower alcohol solvent to introduce formyl groups on the core surface.
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Abstract
The present invention is directed to a method for producing an optical fiber having formyl groups on a core surface. In one embodiment, a plastic optical fiber having formyl groups on a core surface is obtained by immersing the core surface of the plastic optical fiber in a treating solution containing at least a 0.5 to 40 mM alkali metal hydroxide and a compound having formyl groups in water or lower alcohol solvent. In the other embodiment, a plastic optical fiber having formyl groups on a core surface is obtained by introducing a vic-diol group, a primary hydroxyl group or an alkenyl group on the core surface, and then oxidizing it. Turbidity on the core surface of the optical fiber thus obtained is minimized, thereby reducing the transmittance losses of light.
17 Citations
16 Claims
- 1. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the step of immersing the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, in a treating solution containing from 0.5 to 40 mM alkali metal hydroxide and a compound having formyl groups, in water or lower alcohol solvent to introduce formyl groups on the core surface.
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7. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the steps of reacting, at a temperature of 45°
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C. for 5 to 20 minutes, the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, with a compound represented by Formula (3);
##STR16## wherein R1 represents a hydrogen atom, a lower alkyl group of C1 to C3 or a hydroxyl group;
R2 represents --(CH2)n -- and n represents an integer of 0 to 6; and
R3 represents a hydrogen atom or an alkyl group of C1 to C6, to introduce on the core surface vic-diol groups represented by Formula (4);
##STR17## wherein R1, R2 and R3 are the same as above, and then oxidizing the vic-diol groups to introduce formyl groups on the core surface.
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8. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the step of reacting, at a temperature of 45°
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C. for 5 to 20 minutes, the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, with a primary aldehyde alcohol to introduce primary hydroxy groups on the core surface, and then oxidizing the primary hydroxyl groups to introduce formyl groups on the core surface. - View Dependent Claims (9, 10, 11)
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12. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the steps of reacting, at a temperature of 45°
- -60°
C. for 5 to 20 minutes, the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, with a compound represented by Formula (6);
##STR19## wherein R1 represents a hydrogen atom, a lower alkyl group of C1 to C3 or a hydroxyl group;
R2 represents --(CH2)n -- and n represents an integer of 0 to 6; and
R3 represents a hydrogen atom or an alkyl group of C1 to C6, to introduce on the core surface alkenyl groups represented by Formula (7);
##STR20## wherein R1, R2 and R3 are the same as above, and then oxidizing the alkenyl groups to introduce formyl groups on the core surface. - View Dependent Claims (13, 14, 15)
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16. A method for producing a plastic optical fiber having formyl groups on a core surface thereof, comprising the step of immersing the core surface of a plastic optical fiber, selected from the group consisting of polystyrene, polyacrylic ester, polyester, polyacrylamide, polyvinyl alcohol, polyethylene terephthalate, polycarbonate and copolymers thereof, in a treating solution containing from 0.5 to 40 mM alkali metal hydroxide and a compound having formyl groups, in water or lower alcohol solvent to introduce formyl groups on the core surface wherein said immersion step comprises a heat-treatment at a temperature of 45°
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C. for 5 to 20 minutes.
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Specification