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Copolymer having cyclic ether structure in main chain, optical member comprising the copolymer, and method of producing the same

A technology of copolymers and repeating units, used in optical elements, optics, light guides, etc., can solve problems such as unfavorable transparency

Inactive Publication Date: 2007-05-30
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copolymers that are random copolymers are more likely to exhibit crystallinity depending on the method of polymerization or the content of vinylene carbonate, and this is disadvantageous for applications requiring clarity

Method used

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  • Copolymer having cyclic ether structure in main chain, optical member comprising the copolymer, and method of producing the same
  • Copolymer having cyclic ether structure in main chain, optical member comprising the copolymer, and method of producing the same
  • Copolymer having cyclic ether structure in main chain, optical member comprising the copolymer, and method of producing the same

Examples

Experimental program
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preparation example Construction

[0105] A method for preparing a preform (PF), comprising:

[0106] placing a refractive index modifier, or a mixture of the copolymer of the present invention and a refractive index modifier, on a central or peripheral portion of a molded article formed from a polymer, and

[0107] allowing the refractive index modifier to diffuse thermally thereto; or

[0108] A plurality of molten resin layers containing a refractive index adjuster in amounts different from each other are stacked and the refractive index adjuster is allowed to diffuse between respective adjacent layers.

[0109] Method (2):

[0110] A method for preparing a preform (PF), comprising:

[0111] The solution of the copolymer of the present invention, optionally together with a refractive index adjuster, is poured into the hollow part of a glass tube or a hollow tube formed of a low refractive index material to become a cladding part, and the organic solvent is decompressed or heated. Evaporation was performed...

Embodiment 1

[0161] [Exemplary Preparation of Copolymer (P-3)]

[0162] Into a 100 ml autoclave were charged 24 parts of ethyl acetate, 20 parts of 1,4-dioxene (M1-1: a product of Tokyo Kasei Kogyo, Co., Ltd.) and 0.3 parts of tert-butyl peroxyvaleric acid ( product of NOF Corporation), and the remaining volume was replaced with nitrogen. Next, 31 parts of chlorotrifluoroethylene (product of Daikin Industries, Ltd.) was further added, and the above mixture was polymerized at 55° C. for 13 hours with stirring. After polymerization, the pressure was returned to normal pressure, and the lid was opened. The polymer solution was found to be saturated, and a part of the polymer precipitated out. The precipitated polymer was dissolved in 150 ml of tetrahydrofuran (THF), the solution was mixed with ethyl acetate solution, and the product was purified by reprecipitation in methanol. The reprecipitation was repeated twice to obtain 35 g of a fluorine-containing copolymer having a Tg of 154° C.,...

Embodiment 2

[0164] [Exemplary Preparation of Copolymer (P-11)]

[0165] Into a 20 ml test tube were added 2 parts of 1,4-dioxene (M1-1: product of Tokyo Kasei Kogyo, Co., Ltd.), 5.15 parts of trifluoroethyl 2-trifluoromethacrylate (product of TOSOH Corporation) and 0.0082 parts of tert-butylperoxyisopropylene monocarbonate (product of NOF Corporation), the remaining volume was replaced with argon, and the above mixture was polymerized at 90°C for 20 hours without stirring. The resulting rod-shaped polymer was dissolved in THF, poured into hexane and purified by repeating reprecipitation twice to obtain 4.1 g of a fluorine-containing copolymer having a Tg of 158°C and a number average molecular weight (Mn) of 39,000 matter (P-11). The polymer is soluble in ethyl acetate, tetrahydrofuran (THF) and the like. The polymer (P-11) was dissolved in THF, coated on a slide, and the solvent (THF) was first removed in air, and then the solvent was distilled off under reduced pressure. The result...

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Abstract

The novel copolymer is disclosed. The copolymer comprises 1 to 99 mol% of at least one repetitive unit (P1) of the formula (1) and 99 to 1 mol% of at least one repetitive unit (P2) of the formula (2). In the formulae, R<1> and L<1> represent independly H atom, deuterium atom, halogen atom or optionally substituent group; X and Y represent independly O atom or S atom, n1 represents an integer of 2-4, and l and m represent independly repeat data of repeating units, as a precondition, at least one of R<1>-R<4> is not F and at least one of L<1>-L<4> including one or several F atoms, optionally two groups selected from L<1>-L<4> can form circularity configuration.

Description

technical field [0001] The present invention relates to novel copolymers having a cyclic ether structure. The present invention belongs to the technical field of plastic optical elements, more specifically optical elements preferably used as optical fibers, optical waveguides, optical lenses, etc., copolymers for the preparation of the optical elements and their preparation methods. Background technique [0002] Plastic optical elements are superior to conventional glass optical elements of the same structure in terms of simplicity and cheapness of manufacture and processing, and thus many efforts have been made in recent years to apply them to optical fibers, optical lenses, optical waveguides, and the like. Among these optical components, although the plastic optical fiber (hereinafter sometimes referred to as POF) formed entirely of plastic material has some disadvantages in that the transmission loss is slightly larger than that of the glass optical fiber, the plastic op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F234/00G02B1/04G02B6/00
CPCC08F220/22C08F220/24C08F234/02Y10T428/24942
Inventor 佐佐木广树富田秀敏京田浩和山田耕三郎
Owner FUJIFILM CORP