Development of Perfluoro Transparent Resins Obtained by Radical Cyclopolymerization for Leading-edge Electronic and Optical Applications
Masaru NAKAMURA*, Norihide SUGIYAMA, Yasuo ETOH, Ko AOSAKI† and Junji ENDO
Research Center, Asahi Glass Co., LTD.; 1150 Hazawacho, Kanagawa-ku, Yokohama-shi 221-8755 Japan
† Fluoropolymers Div., Asahi Glass Co., LTD.; 1-12-1, Yurakucho, Chiyoda-ku, Tokyo 100-8405 Japan
Radical cyclopolymerization of perfluoro (ω-vinyloxy-1-alkene)s (CF2=CF-O-(CF2)x-CF=CF2) (x=1, 2) yields amorphous plastics which have high optical permeability and solubility besides features of commercial perfluoropolymers (i. e. outstanding thermal and chemical resistant, low dielectric constant and refractive index). The polymer from perfluoro (4-vinyloxy-1-butene) (x=2) has a higher Tg and is useful for leading edge electronics and optical applications. The polymerization behavior can be classified to the conventional radical polymerization where 5 membered ring formation is dominant. Fluorination of the end groups gave an optical material which has the highest optical clarity at wide wavelength range (200 nm to 1500 nm) of the known organic polymers. Modification of the end groups to aminosilane moieties gives adhesive character to the polymer. Such modifications made it possible to apply this resin to optical fiber, pellicle, antireflective coating, low-K for LSI etc.
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