NIPPON GOMU KYOKAISHI
Print ISSN : 0029-022X
Volume 93 , Issue 6
Showing 1-7 articles out of 7 articles from the selected issue
Special Issue for General Reviews “The Latest Technology and Material in Kanto and Kansai Branches Exhibition”
Introductory Remarks
General Reviews
  • Toshiya TAKEUCHI
    2020 Volume 93 Issue 6 Pages 190-194
    Published: 2020
    Released: August 15, 2020
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    An anti-adhesive agent is used to prevent the adhesion when unvulcanized rubber is stacked and stocked. We have been developing various types of anti-adhesive agents such as soap based type, powder type and polymer component based type from the environment and productivity. These anti-adhesive agents have received a certain evaluation from rubber producer, but the properties of the anti-adhesion are affected by wettability, sinking, stretching of the anti-adhesion film to rubber surface, and improvement requests from rubber producer are still strong. We hope that we can contribute to the development of the rubber industry by developing new anti-adhesive agent.

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  • Shinichi KATO
    2020 Volume 93 Issue 6 Pages 195-201
    Published: 2020
    Released: August 15, 2020
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    SDGs become important for rubber industry. For tire and rubber companies, there are a lot of topics to do for Sustainable Development Goals, such as environment issue, labor condition improvement at factory, material recycling and development of environment friendly tire and rubber goods. To use raw materials which can meet SDGs idea is also important. In general traceability of natural rubber materials up to rubber plantation, so far, cannot be confirmed. VRGJAPAN in Vietnam can supply natural rubber CV, L, 3L grade which has description of factory name, plantation, production date, grade on each bale with bar code identification. This rubber is made by the factories and the plantation which are guaranteed for no conflict of SGDs 17 goals. Rubber companies can get closer to SDGs by sourcing this natural rubber which can secure its traceability and no conflict of SDGs. This rubber is now supplied by Shinichi Kato Office Co., Ltd. in Japan.

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  • Satoko YASUDA, Fritz SIMEON
    2020 Volume 93 Issue 6 Pages 202-206
    Published: 2020
    Released: August 15, 2020
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    Fluoropolymers are unique specialty polymers that have superior characteristics such as water & oil repellency and superior resistance to various chemicals and weather, making them both reliable and highly suitable for many critical applications. Among other elastomeric materials, fluoroelastomers have excellent properties. The fluorinated elastomers have an outstanding chemical resistance and heat resistance allowing to be used continuously at extreme temperature conditions for many industrial applications. In this article, the unique chemical and functional structures of fluoroelastomers are demystified. In addition, the current applications and potential prospects of fluoroelastomers are discussed.

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  • Shiki NOJIMA, Toshihiro NOBUOKA, Hiroshi AOSHIMA, Yasuo UEKITA, Osamu ...
    2020 Volume 93 Issue 6 Pages 207-214
    Published: 2020
    Released: August 15, 2020
    JOURNALS RESTRICTED ACCESS
    Supplementary material

    The rubber/filler coupling agents, SUMILINK®100/200, have been developed with the aim of reducing the hysteresis loss of natural rubber (NR)/carbon black (CB) composite. These two coupling agents effectively reduce tan δ (60°C) value without negative effect on other properties by inducing better CB dispersion in the composite.

    The coupling agents are also able to be applied to various rubber/filler composites, such as NR/silica, emulsion polymerized styrene-butadiene rubber/CB, butadiene rubber/CB, chloroprene rubber/CB and ethylene-propylene-diene rubber/CB composites, for the purpose of improving properties.

    In this article, we report development strategy, general properties, plausible mechanism and applications of the coupling agents to the various rubber/filler composites.

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  • Daisuke YAMAKI
    2020 Volume 93 Issue 6 Pages 215-219
    Published: 2020
    Released: August 15, 2020
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    Various additives are compounded in rubber products depending on the required performance. Among the required functions, we will introduce 3 additives that improve aging, appearance and lubricity respectively. Reactive antioxidant “4A maleimide”, which improves heat resistance and flex resistance by reacting with rubber. Appearance enhancer “New Aid CS, SB”, which improves the blooming on the rubber surface caused by additives. Lubricity-imparting agent “New Aid SLP”, which enables early onset and sustained lubrication effects.

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