Kureha Kagaku Kogyo Kabushiki Kaisha

Masayasu Suzuki

Masaki Ohya

Akio Kobayashi

Akira Kaneko

Mitsuru Hoshino

Masaki Kobori

A latex of vinylidene chloride copolymer particle which has a three-layered structure comprising 20 to 70 parts by weight of a core layer of vinylidene chloride copolymer containing 85 to 94% by weight of vinylidene chloride, 3 to 15 parts by weight of an intermediate layer of vinylidene chloride copolymer containing more than 94% by weight of vinylidene chloride and 20 to 70 parts by weight of an outer layer of vinylidene chloride copolymer containing 85 to 94% by weight of vinylidene chloride, the three layers amounting to 100 parts by weight.

Latex of vinylidene chloride copolymer

A transparent resin composition comprising (1) 6 to 100% by weight of a nitrile graft copolymer comprising a rubber trunk polymer and a branch polymer grafted thereon, which has been obtained by graft-polymerizing onto the rubber trunk polymer a monomer mixture containing an unsaturated nitrile and a monomer copolymerizable therewith, and (2) 0 to 94% by weight of a random copolymer of an unsaturated nitrile and a monomer copolymerizable therewith, the resin components of the resin composition other than the rubber trunk polymer constituting a matrix resin, wherein

Transparent resin composition for information signal recording discs

A process for producing a graft polymer possessing a low gas-permeability and an excellent impact resistance and thermal stability which comprises the steps of:

Process for producing a graft polymer

A phonograph or video disc comprises at least one unsaturated nitrile copolymer and has therein an unsaturated nitrile content of from 40 to 90 percent by weight, and the disc exhibits a Clash-Berg flex temperature of from 50.degree. to 120.degree. C, an absorbed impact energy of at least 0.5kg.cm. when tested with a test specimen thereof of a 2-mm. thickness by a Dynstat impact test according to BS-1330-1946, and a Shore D hardness of from 75 to 95.

Information signal recording disc

A process for producing vinyl or vinylidene polymers comprising polymerizing vinyl or vinylidene monomers in the presence of 0.1 to 5.0 % by weight of at least one compound represented by the following formula based upon the total weight of monomers, wherein the degree of polymerization of the vinyl or vinylidene polymers is controlled, ##EQU1## wherein R.sub.1 is --CR.sub.5 R.sub.6).sub.n wherein R.sub.5 and R.sub.6 are hydrogen atoms or alkyl groups containing 1 to 4 carbon atoms and n is an integer of 1 or more; R.sub.2 is a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms; and R.sub.3 and R.sub.4 are hydrogen atoms or alkyl groups containing 1 to 4 carbon atoms may be combined to form a ring.

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Iwaki, Japan

Masayasu Suzuki