Shin-etsu Chemical Co., Ltd.

Yuji Tokushige

Norio Nakamura

Shuhei Ueda

Yoichi Tanifuji

Masaharu Takahashi

Kunio Itoh

Tetsuo Shiba

Makoto Ooura

Yasuhiko Sato

Tatsuhiko Hongu

Osamu Sodeyama

Jun Koizumi

The rigid vinyl chloride resin composition comprises 100 parts by weight of a vinyl chloride resin having an average degree of polymerization of 350 to 600, 5 to 30 parts by weight of an impact-resistant improver, and 5 to 20 parts by weight of an acrylonitrile-styrene copolymer having a weight ratio acrylonitrile and styrene of 1/99 to 9/91. This composition has good impact strength and fluidity.

Rigid vinyl chloride resin composition

The present invention provides a novel biodegradable polymer compositions effecting superiority in elongation at break, Izod impact strength and mold releasability which has not been obtained before the past and provides a biodegradable shrink film exceling in transparency, strength, flexibility, mold releasability and shrinkability by applying the biodegradable polymer composition to the shrink film. Thus, the biodegradable polymer compositions are provided which comprise as a main component a mixture of two or more of polylactic acids, glycol/aliphatic dicarboxylic acid copolymers and polycaprolactones and these biodegradable polymer compositions are applied to shrink films.

Biodegradable polymer compositions and shrink films

The present invention provides polylactic compositions effecting an excellent mold releasability upon processing and significantly improved elongation at break and impact strength without affecting the transparency. Also provided is a shrink film which decomposes under the natural environment and has excellent transparency, flexibility, shrinkability and mold releasability upon processing by applying the polylactic acid composition to a shrink film. There is provided a biodegradable polymer composition comprising 100 parts by weight of polylactic acid and 5 to 70 parts by weight of EVA. Further, a biodegradable polymer composition is provided comprising the polymer composition with one or more additives selected from the group consisting of 0.05 to 5 parts by weight of a lubricant, 1 to 50 parts by weight of plasticizer, 0.5 to 5 parts by weight of thermal stabilizer and 0.05 to 5 parts by weight of mold releasing agent. These biodegradable polymer compositions are applied to shrink films.

A composition comprising polylactic acid and 0.05 to 5 parts by weight of silicone oil per 100 parts by weight polylactic acid, having improved mechanical properties.

Polylactic acid composition

An antibacterial substance comprising a peptide comprising a fragment constituting lepidopteran A and containing the N-terminal amino acid residue of the lepidopteran A, wherein the carboxyl group at the C-terminal of said peptide is substituted with an alkyl amide group represented by Formula (I):

Antibacterial substance

The invention provides a novel method for surface priming when adhesive bonding is desired between a rubber, e.g. silicone rubber, and a substrate of a material such as a metal or plastic resin. The inventive method is performed by use of a primer composition of which the principal ingredient is an organosilicon polymer hitherto not used for such a purpose. The organosilicon polymer is represented by the average unit formula R.sub.a Six.sub.4-a, in which R is a monovalent hydrocarbon group, X is a divalent atom or group selected from the class consisting of an oxygen atom, an imino group, alkylene groups and a phenylene group and a is a positive number of 0.2 to 1.8, at least one of the hydrocarbon groups denoted by R in a molecule being aliphatically unsaturated and at least 10% by moles of the groups denoted by X in a molecule being the imino groups. This primer composition has good workability and gives adhesive bonding capable of withstanding a prolonged heat treatment in a dry condition or by dipping in a hot oil such as a silicone fluid.

Method for surface priming in adhesive bonding

A novel photocurable organopolysiloxane composition is proposed capable of giving a cured product having a very high anti-moisture resistance even at an elevated temperature to withstand a treatment in boiling water for 1 hour or longer without coming off from the substrate surface on which it has been applied and cured by irradiation with light. The composition comprises a specific acryloyloxy-containing organopolysiloxane as the base component, an epoxy compound and a photosensitizer. The composition is suitable, for example, for providing a moisture-proof overcoating on various electronic parts such as a capacitor.

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Ibaraki-ken, Japan

Yuji Tokushige