Central Glass Company, Limited

Asahi Kasei Kogyo Kabushiki Kaisha

Toshio Koishi

Kazuhiko Maeda

Takashi Yasumura

Mikio Ootani

Isao Tanaka

Taku Yamauchi

Yutaka Maruyama

Seichi Katsuragawa

Kentaro Tsutsumi

Iwao Ojima

Yoshio Imai

Akira Ishihara

Katsunori Kawamura

Seiiti Minegishi

Masaaki Kakimoto

Shinichi Teshima

Shigeki Katsuta

Akira Kawada

Kiyomi Sugawara

Hideaki Sueta

Toru Koshita

Takamasa Fuchigami

Yukitoshi Nishikawa

Sinzi Nanba

The invention provides an adhesive for bonding together a first substrate made of a polyvinylidene fluoride resin and a second substrate. This adhesive includes an elastic fluorohydrocarbon resin, an acrylic resin, a polyvinylidene fluoride resin, a polyisocyanate, and an organic solvent. This elastic fluorohydrocarbon resin is obtained by graft copolymerization of a fluorine-containing copolymer with a vinylidene fluoride monomer. This copolymer is prepared by copolymerizing at least one first fluorine-containing monomer with at least one unsaturated monomer that has peroxy bond. The adhesive itself is superior in durability, and bond strength between the first and second substrates is also superior.

Adhesive for bonding together polyvinylidene fluoride resin and substrate

The invention provides a copolymer which comprises, as essential components, 25-75 mol % of a fluoroolefin such as CTFE, 10-70 mol % of a carboxylic acid vinyl ester, 3-75 mol % of a hydroxyl-containing allyl ether and 0.1-20 mol % of an unsaturated carboxylic acid having at least 6 carbon atoms in the molecule. The copolymer is soluble in various organic solvents and curable, e.g., with a blocked polyisocyanate or a modified melamine resin. The copolymer can be prepared by a suspension polymerization method in an aqueous medium and hence can be made very low in the contents of unreacted residual monomers. The copolymer is very suitable for use in electrodeposition paints.

Fluoroolefin based copolymer useful in electrodeposition paints

The invention relates to a coating composition suitable for application to plastic surfaces. The coating composition comprises, as essential components, 100 parts by weight of a chlorotrifluoroethylene based copolymer having hydroxyl group as a functional group, a curing agent for the copolymer such as a polyisocyanate, 0.5-30 parts by weight of an acrylic or methacrylic polymer which serves as an adhesion improving component, and an organic solvent. Usually the composition contains an ultraviolet absorber and another light stabilizer. For example, on a polycarbonate article this composition provides a durable coating film without marring the transparency and healthiness of the polycarbonate substrate. By the addition of a pigment the coating is modified into a paint composition which is particularly useful for repairing a bake finished paint film formed by using a polyvinylidene based paint.

Fluororesin based coating composition applicable to plastic surfaces

The invention provides a novel copolymer comprising 25-75 mol % of a fluoroolefin such as CTFE or TFE, 10-70 mol % of an alkene such as ethylene or propylene, 3-40 mol % of a hydroxyl-containing allyl ether such as ethylene glycol monolallyl ether and 0-20 mol % of a carboxyl-containing monomer such as vinylacetic acid. This copolymer possesses favorable properties characteristic of fluororesins, is soluble in organic solvents including aromatic solvents low in polarity, such as xylene, and is curable at relatively low temperatures. The copolymer is useful particularly as a paint vehicle. The water repellency of the copolymer in cured state can be enhanced by incorporating a fluorine-containing surface modifier in the copolymer.

Fluoroolefin-alkene base copolymer useful as paint vehicle

The invention provides a novel copolymer comprising 25-75 mol % of a fluoroolefin such as CTFE, 10-80 mol % of a combination of a fatty acid vinyl ester having not more than 4 carbon atoms in the acid part and at least one other carboxylic acid vinyl ester which has a larger number of carbon atoms and is selected from aliphatic and aromatic carboxylic acid vinyl esters, 3-40 mol % of a hydroxyl-containing allyl ether such as ethylene glycol monoallyl ether and 0-20 mol % of a carboxyl-containing monomer such as vinylacetic acid. The copolymer has a number average molecular weight of 3000 to 10000. This copolymer possesses favorable properties characteristic of fluororesins, is soluble in organic solvents including aromatic solvents low in polarity, such as xylene, and is curable at relatively low temperatures. A solution of this copolymer is useful as a liquid vehicle of a paint. Optionally, a portion of the vinyl ester component of the copolymer is replaced by an alkyl vinyl ether to enhance pliability of paint films using the copolymer.

Fluorine-containing copolymer useful as paint vehicle

A polymer blend of 2-80 wt % of an acrylic or methacrylic ester base polymer and the balance of a ternary copolymer of vinylidene fluoride (VDF), hexafluoroacetone (HFA) and tetrafluoroethylene (TFE) is very high in transparency and serves as a thermoplastic resin useful for optical purposes. The first polymer of the blend can be selected from homopolymers and copolymers of C.sub.1 -C.sub.4 alkyl acrylates and methacrylates. The second polymer is preferably made up of 2-15 mol % of HFA, 5-60 mol % of TFE and the balance of VDF. The polymer blend has a relatively low index of refraction, which can be controlled by selecting the first and second polymers and/or by varying the blending ratio. The polymer blend is soluble in various organic solvents. Besides, the polymer blend serves as a thermochromic material that becomes opaque by heating and resumes transparency by cooling.

Polymer blend composition suitable as optical material

A cladding material for plastic optical fiber comprising a vinylidene fluoride-trifluoroethylene-hexafluoroacetone copolymer which comprises 3.5 to 6.5% by mole of hexafluoroacetone units, a molar ratio of vinylidene fluoride unit to trifluoroethylene unit of 3 to 6:1, and a melt index of 10 to 60 g/10 min, and a plastic optical fiber comprising said cladding material and a methyl methacrylate homopolymer or copolymer which comprises over 50% by weight of methyl methacrylate units as the core material.

Cladding material for plastic optical fiber and plastic optical fiber

An information recording card using a semiconductor laser beam for writing and reading information. The card comprises a recording layer formed on one side of a card substrate and a light absorbing layer closely interposed between the substrate and the recording layer. The material of the recording layer is a polymer blend which comprises a copolymer of vinylidene fluoride and at least one F-containing comonomer, preferably hexafluoroacetone, and an acylic or methacylic ester polymer and which exhibits phase separation by heating. The light absorbing layer is for efficiently absorbing laser light used for recording and transforming it into heat energy. A good embodiment of the light absorbing layer is a film of Bi or Te, and another good embodiment is a thin layer of a resin composition containing fine particles of at least one of Bi, Te and C dispersed in a thermoplastic or thermosetting resin.

Optical information recording card using phase separation of polymer

Novel aromatic polyethers excellent in heat resistance and soluble in various organic solvents are obtained by introducing 9,9-biphenylfluorene group, optionally together with another divalent aromatic group, into the structural units of a polyether derived from either diphenyl ketone or diphenyl sulfone.

Aromatic polyethers having biphenylfluorene group

The invention relates to an optical fiber of the step-index type using quartz glass or an inorganic optical glass as the core material and a fluorine-containing resin as the cladding material. A copolymer of vinylidene fluoride with hexafluoroacetone, preferably at a molar ratio in the range from 96:4 to 88:12, is employed as the cladding material. Using such a copolymer, a highly transparent and very strong and tough cladding layer can easily be formed by a solution coating method.

Optical fiber having glass core and fluoro-copolymer cladding

The invention relates to a novel fluorine-containing copolymer which comprises 25-75 mol % of chlorotrifluoroethylene, 10-70 mol % of a vinyl or isopropenyl ester of fatty acid and 3-40 mol % of allylglycidyl ether and may optionally comprise additional comonomer(s) such as an acrylate. This copolymer possesses favorable properties characteristic of fluororesins, is soluble in various organic solvents and is curable with a compound having a functional group that reacts with epoxy group. A coating liquid using this copolymer gives a hard, stable and transparent coating film on either metal surface or glass surface.

Soluble and curable fluorine-containing copolymer

The invention is an optical fiber having a core formed of either an inorganic glass or an organic polymer such as polymethyl methacrylate and a cladding layer formed of a ternary copolymer of vinylidene fluoride, hexafluoroacetone and either trifluoroethylene or tetrafluoroethylene. This cladding material is superior particularly in transparency and flexibility.

Optical fiber using vinylidene fluoride base ternary copolymer as

The invention relates to an optical fiber of the step-index type in which the core material is poly(methyl methacrylate) or a copolymer of methyl methacrylate with another methacrylate or an acrylate. A copolymer of vinylidene fluoride with hexafluoroacetone is employed as the cladding material which makes good adhesion to the polymethacrylate core. When the amount of hexafluoroacetone is 4-20 mole %, the copolymer is low in crystallinity, high in transparency, appropriately low in refrax index and higher than 100.degree. C. in softening temperature, and can be extruded under the conditions suited to extrusion of poly(methyl methacrylate).

Optical fiber having polymethacrylate core and fluoro-copolymer cladding

A blend polymer composition, which is superior to polyvinylidene fluoride (PVDF) in impact resistance and retains favorable properties of PVDF, is obtained by blending 1-100 parts, and preferably 1-50 parts, by weight of a copolymer of vinylidene fluoride (VDF) and hexafluoroacetone (HFA) with 100 parts by weight of PVDF. Preferably the mole ratio of copolymerized VDF to HFA is from 96:4 to 50:50.

Polyvinylidene fluoride base blend polymer

Disclosed is a curable fluorine-containing copolymer, comprising 25-75 mol % of first repeating units which originate from chlorotrifluoroethylene, 10-70 mol % of second repeating units which originate from a vinyl or isopropenyl ester of fatty acid, such as vinyl acetate or isopropenyl acetate, 3-40 mol % of third repeating units which originate from a hydroxyl-containing allyl ether such as ethylene glycol monoallyl ether and 0-20 mol % of optional repeating units which originate from an optional monomer such as an acrylate. This copolymer possesses favorable properties characteristic of fluoro-resins, is soluble in organic liquids and is curable with a compound having a functional group that reacts with active hydrogen, such as a polyisocyanate. A coating liquid composition obtained by adding such a curing agent to a solution of the copolymer in an organic solvent is of wide use for painting and other coating purposes.

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Sakado, Japan

Toshio Koishi