Mitsui Toatsu Chemicals, Incorporated

Mitsui Chemicals, Inc.

Toyo Engineering Corporation

Kouzo Ichikawa

Norifumi Ito

Tetsuyuki Matsubara

Hideo Amemiya

Toshihiko Ando

Mune Iwamoto

Shigeo Nishikawa

Kazuo Sugazaki

Michio Eriguchi

Haruo Inoue

Takanori Sueda

Kaoru Yorita

Tetsuo Maeda

Hitoshi Ozawa

Takayoshi Sekido

Yasuo Furuta

Mitsuyoshi Kato

Shinji Okajima

Nobumoto Kojima

Kouichi Arahari

Disclosed is a process for the production of an injection-expansion molded, thermoplastic resin product. The process comprises a gas dissolving step, a cooling step, a metering and injection step, and an expansion controlling step. Specifically, a thermoplastic resin is molten in a continuous plasticator (1), supercritical carbon dioxide and/or nitrogen is added as a blowing agent, and the blowing agent and the thermoplastic resin are formed into a mutually-dissolved state. The resultant molten resin composition is cooled within the plasticator while maintaining a pressure equal to or higher than a critical pressure of the blowing agent. The thus-cooled molten resin composition is metered by an injector (7) and is filled in a mold (8). An internal pressure of the mold is lowered beyond the critical pressure of the blowing agent to produce cell nuclei, whereby the cell diameter is controlled. The blowing agent is maintained in a supercritical state up to the metering and injection step.

Injection-expansion molded, thermoplastic resin product and production

A process for preparing an expanded product of a thermoplastic resin which includes a gas dissolving step of adding supercritical carbon dioxide and/or nitrogen as an blowing agent to a thermoplastic resin, and melting it in the thermoplastic resin, a cooling step of cooling the resulting molten resin composition under a pressure not less than a critical pressure of the blowing agent, a nuclei forming step of discharging the molten resin composition from a die to lower the pressure to a level not more than the critical pressure, and an expansion controlling step of cooling an expanded product of the thermoplastic resin to a level not more than a glass transition temperature or a crystallization temperature of the resin to control a cell diameter of the expanded product.

Process for preparing expanded product of thermoplastic resin

A resin composition having excellent antistatic properties is provided which comprises (A) 100 parts by weight of a styrene resin, (B) 3 to 35 parts by weight of a polyethylene oxide, (C) 0.1 to 10 parts by weight of a styrene-acrylonitrile-hydroxyalkyl acrylate copolymer and/or a styrene-acrylonitrile-hydroxyalkyl methacrylate copolymer, (D) 4 to 100 parts by weight of a (meth)acrylic ester polymer, and/or an oxide selected from the group consisting of titanium oxide, zinc oxide and magnesium oxide, the oxide being present in an amount of 0.7 to 5 parts by weight per 100 parts by weight of the combined amount of components (A) and (B), and (E) a surface-active agent comprising a specified sulfonic acid salt or alkylsulfuric acid salt, the surface-active agent being present in an amount of 0.4 to 5 parts by weight per 100 parts by weight of the combined amount of components (A), (B), (C) and (D). This resin composition can be used for general household articles including, for example, wardrobe cases.

Resin compositions having excellent antistatic properties

A process for preparing rubber modified high impact resins by dissolving a rubbery polymer in a monomer containing an aromatic vinyl monomer or a mixture of an aromatic vinyl monomer and a vinyl cyanide monomer followed by polymerizing the monomer, the two steps being carried out in at least two polymerization reactors with a particle disperser placed between the first and second reactors. High impact resins having excellent surface properties are obtained with a savings in a power consumption by controlling:

Continuous process for preparing rubber modified high impact resin

A process for producing a styrene-base resin having improved moldability and a good hue by continuously adding a specific higher fatty acid amide in a dissolved or molten state, and/or a mixture of a specific higher fatty acid amide and a specific metallic soap in a molten state, to a styrene-base resin in the course of its production by continuous bulk or solution polymerization. The above process is particularly effective for rubber-modified styrene-acrylonitrile resins.

Continuous production process of styrene-base resin

In a continuous bulk or solution polymerization process for producing rubber modified high-impact resins which comprises continuously feeding a raw material solution comprising a mixture of an aromatic vinyl monomer and a vinyl cyanide monomer and a rubber component dissolved in the mixture, together with a radical polymerization initiator, to a first reactor, polymerizing the raw material solution under high-shear agitation to a conversion required to transform the rubber component phase into dispersed particles, withdrawing the reaction mixture continuously from the first reactor at a rate corresponding to the feed rate of the raw material solution, and feeding the reaction mixture to a second or more reactors for further polymerization, rubber modified high-impact resins exhibiting excellent chemical resistance, thermal resistance and rigidity and having a good surface gloss can be produced by properly determining the weight ratio of the aromatic vinyl monomer to the vinyl cyanide monomer present in the raw material solution, the content of the rubber component in the raw material solution, the content of the solvent in the raw material solution, the property of the rubber component, the property of the radical polymerization initiator and the amount of initiator used, as well as the conversion of the monomers at the first reactor.

Continuous process for producing rubber modified high-impact resins

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Takaishi, Japan

Kouzo Ichikawa