Nippon Zeon Company, Ltd.

Victor Company of Japan, Limited

Takao Okuda

Akira Wada

Akira Nishizawa

Mamoru Nakamura

Kazumichi Miyamoto

Nobuhide Hada

Risoh Iwata

Takaharu Abe

A hard vinyl chloride resin composition for information signal recording media, said composition consisting essentially of

Hard vinyl chloride resin composition for information signal recording

An improvement is provided in and relating to a capacitance-type record medium wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area. The improvement consists in the fact that at least the surface area of the record medium is formed of (1) a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds, or (2) a material composed of an electrically conductive substance and a polymer mixture consisting of at least two polymers in which the proportions of the constituent monomers are the same as in the aforesaid copolymer.

Information signal record medium of the capacitance type

An epoxy resin composition comprising (a) a cyclopentadiene-type hydrocarbon resin having a hydroxyl value of 100 to 300 obtained by copolymerizing a cyclopentadiene-type monomer and a hydroxyl-containing monolefinic monomer at elevated temperatures, (b) a polyol selected from the group consisting of epoxy resins containing at least two hydroxyl groups in the molecule and epoxy resin derivatives containing at least two hydroxyl groups in the molecule and obtained by the reaction of epoxy resins with alkanolamines, and (c) an isocyanate-type curing agent. The compositions have improved low temperature curability, acid resistance and water resistance while retaining the various desirable properties of epoxy resins such as chemical resistance and oil resistance, and which when used as paints, exhibit improved adhesion to an adherend and improved re-coating adhesion to the film formed thereon.

Cyclopentadiene resin and isocyanate cured epoxy resin compositions

A process for producing a cyclopentadiene resin by heat copolymerizing a cyclopentadiene monomer and a comonomer copolymerizable therewith, which comprises

Process for producing cyclopentadiene resins

In a thermosetting coating composition comprising at least one thermosetting resin selected from aminoalkyd resins and aminoacrylic resins as a main ingredient of a vehicle, the improvement wherein the composition contains 100 parts by weight of the thermosetting resin and 5 to 50 parts by weight of a cyclopentadiene-derived hydrocarbon resin having a softening point of 50.degree. to 160.degree. C. and obtained by heat polymerizing a mixture of 85 to 55% by weight of a cyclopentadiene-type monomer with 15 to 45% by weight of a polar monolefinic monomer copolymerizable therewith. The compositions have improved flexibility, impact strength and adhesion and are useful as vehicles for thermosetting oil-base paints.

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Yokohama, Japan

Takao Okuda