Abstract: This invention relates to an optical material comprising a polymer which has a structural unit represented by the formula ##STR1## wherein X.sup.1 and X.sup.2 are the same or different and are each hydrogen or deuterium, and R.sup.1 is a chain hydrocarbon group having 1 to 5 carbon atoms, a cyclic hydrocarbon group (with or without a substituted lower alkyl group) having 3 to 6 carbon atoms or a deuterium-substituted chain hydrocarbon group having 1 to 5 carbon atoms in an amount of at least 5 mole % of the polymer.

Abstract: This invention provides a process for preparing an .alpha.-fluoroacrylic acid ester characterized by reacting 2,2,3,3-tetrafluorooxetane, a metal halide, an alcohol and a dehalogenating agent. This invention also provides a process for preparing .alpha.-fluoroacrylic acid fluoride, CH.sub.2 .dbd.CFCOF, which is an intermediate for preparing the .alpha.-fluoroacrylic acid ester.

Abstract: A fluorine-containing copolymer comprising chlorotrifluoroethylene, 2,2,3,3-tetrafluoropropyl vinyl ether and 0 to 25% by mole of a vinyl ether having a functional group selected from the group consisting of hydroxyl, glycidyl and amino. The fluorine-containing copolymer has a good compatibility with methyl methacrylate polymers and gives, in combination with methyl methacrylate polymers, products such as coating film, self-supporting film and molded article, which have good stain resistance and transparency.

Abstract: An original plate for dry offset printing comprising a substrate suitable for preparation of an offset printing plate and a film formed on the substrate. The film consists essentially of a copolymer formed from at least 40% of a monomer of the formula: ##STR1## wherein n is an integer of 2 to 7 and R is hydrogen or methyl; and at least one other ethylenically unsaturated monomer.

Abstract: An optical material comprising a copolymer of:(1) ethylene,(2) at least one of tetrafluoroethylene and chlorotrifluoroethylene and(3) olefin having at least one fluoroalkyl group,and a cladding material as used in assembling an optical fiber which comprises the copolymer as defined in above.

Abstract: A fluoro-resin coating composition curable at room temperature and capable of providing coatings having an improved transparency or gloss which can be maintained for a long term, as well as excellent weatherability, chemical and solvent resistances, stain resistance and adhesion to substrates, which comprises a fluorine-containing copolymer comprising vinylidene fluoride and a minor amount of a vinyl monomer having a functional group capable of causing crosslinking at room temperature in the presence of a curing agent having at least difunctionality, and an acrylic resin.

Abstract: A material for optical disks which comprises a polymer containing at least 20 wt. % of a structural unit represented by the formula ##STR1## wherein X is fluorine or alkyl having 1 to 6 carbon atoms, and R.sup.1 is fluoroalkyl having 2 to 10 carbon atoms.

Abstract: A fluorooxyalkyl vinyl ether of the formula: ##STR1## wherein n is an integer of 0 to 5, which is homopolymerizable or copolymerizable with fluoroolefins and homo- or co-polymer thereof.

Abstract: A copolymer for optical fibers of fluoroalkylmethacrylate and methacrylic acid, the fluoroalkylmethacrylate having such properties that a homopolymer made of only the fluoroalkylmethacrylate has a glass transition temperature and a refractive index each in the range given by the following formulae (I) and (II), respectively:(1/Tg).ltoreq.9.47.times.10.sup.-3 -4.556.times.10.sup.-3 n.sup.20 (I)n.sup.20 .ltoreq.1.42 (II)wherein Tg represents the glass transition temperature (.degree.K.) of the homopolymer and n.sup.20 represents the refractive index thereof.

Abstract: A fluorine-containing olefin of the formula: CF.sub.2 .dbd.CF(CF.sub.2).sub.m (CH.sub.2).sub.n OH wherein m is 0 or an integer of 1 to 10 and n is an integer of 1 to 4, which is copolymerizable with various ethylenically unsaturated compounds and provide fluorine-containing copolymers useful as raw materials for room temperature curing paints, fluorine-containing rubbers and the like.

Abstract: A copolymer for optical fibers of fluoroalkylmethacrylate and acrylic acid.

Abstract: A novel fluorine-containing copolymer having functional groups comprising structural units of 1,1-difluoroethylene and structural units of a monomeric compound of the formula: ##STR1## wherein X is --OH, ##STR2## or --COOH group, m is 0 or an integer of 1 to 10 and n is an integer of 1 to 4, which may futher contain structural units of at least one monomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, monofluoroethylene 1,1,2-trifluoroethylene, hexafluoropropene and a fluoroalkyl vinyl ether. The copolymer is curable at room temperature, and is useful as a material for fluorine-containing rubbers, molded articles and paints.

Abstract: Plastic optical fibers comprising as a core component a polymer predominantly containing methyl methacrylate and as a cladding component a copolymer lower in the refractive index than the core component, the plastics optical fibers being characterized by performing conjugate spinning with use of the cladding component which is vinylidene fluoride-tetrafluorethylene copolymer having incorporated therein 5 to 50% by weight of a polymer predominantly containing methyl methacrylate.

Abstract: A fluorine-containing copolymer comprising chlorotrifluoroethylene, 2,2,3,3-tetrafluoropropyl vinyl ether and 0 to 25% by mole of a vinyl ether having a functional group selected from the group consisting of hydroxyl glycidyl and amino. The fluorine-containing copolymer has a good compatibility with methyl methacrylate polymers and gives, in combination with methyl methacrylate polymers, products such as coating film, self-supporting film and molded article, which have good stain resistance and transparency.

Abstract: A copolymer comprising (a) units of a fluorine-containing acrylic monomer having a general formula ##STR1## wherein X is F or CF.sub.3, Y is H or CH.sub.3, n is an integer of 2 to 7, and (b) units of an ethylenically unsaturated monomer having a photosensitive group. The copolymer has an excellent photosensitivity and excellent water and oil repellent properties, and is useful for example as a photosensitive material for dry offset printing plate or resist and as a photo-curable, water and oil repelling coating material.

Abstract: An acrylic type self-adhesive which comprises a polymer comprising (a) units of at least one compound of the formula: ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl, ethyl or propyl group, 1 is an integer of 1 to 5, s is 0 or 1, and Rf is --(CF.sub.2).sub.m X or --(CF.sub.2).sub.p O(CF.sub.2).sub.n F (wherein m is an integer of 1 to 10, X is a hydrogen or fluorine atom or a hexafluoroisopropyl group, n is an integer of 1 to 5 and p is an integer of 1 to 3), and optionally units of (b) at least one compound of the formula: ##STR2## wherein R.sup.2 is a hydrogen atom or a methyl, ethyl or propyl group and R.sup.3 is --OH, --NH.sub.2, --NHCH.sub.2 OH, ##STR3## --OCH.sub.2 CH.sub.2 OH, ##STR4## or --OCH.sub.2 CH.sub.2 N(CH.sub.3).sub.2, said polymer having an intrinsic viscosity of 0.1 to 1.0, which shows excellent oil resistance and water resistance.

Abstract: An optical material comprising a thermal resisting fluoroalkylmethacrylate copolymer which essentially consists of(a) fluorine-containing methacrylate monomer unit of the formula ##STR1## wherein R.sub.f.sup.1 represents a fluoroalkyl group having 1 to 3 carbon atoms and(b) a fluorine-containing acrylate monomer unit of the formula ##STR2## wherein R.sub.1 and R.sub.2 are the same or different and represents a hydrogen atom or a lower alkyl group and R.sub.f.sup.2 represents a fluoroalkyl group having 1 to 3 carbon atoms.

Abstract: Fluoroalkanols of the formula:H(CF.sub.2 CF.sub.2).sub.n CH.sub.2 OH (I)are prepared by telomerization of tetrafluoroethylene with methanol in a batch system. The reaction is carried out while introducing tetrafluoroethylene continuously into the reaction system. The production of fluoroalkanols of the formula (I) wherein n is an integer of 5 or more is suppressed and the production of fluoroalkanols of the formula (I) wherein n is an integer of 4 or less is enhanced.

Abstract: An illumination mechanism for an escutcheon portion of a car sound device such as a car radio, car stereo, etc. The illumination mechanism comprises a light-transmissible plate provided at the front of the escutcheon portion and an illuminating lamp or lamps provided behind the light-transmissible plate. A cassette or cartridge receiving opening is formed in the light-transmissible plate and operating members for the sound device are provided on the plate.

Abstract: An epoxy resin composition which comprises (1) an epoxy resin having at least two epoxy groups per molecule and (2) an amine having at least one perfluoroalkyl group and at least one primary and/or secondary amino groups per molecule can be readily cured to afford a cured product, which shows excellent water resistance, oil resistance and stainproof property.