巻号一覧
78 巻, 2 号
選択された号の論文の13件中1～13を表示しています
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梅津 清徳, 服部 岩和2005 年 78 巻 2 号 p. 41
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーPDF形式でダウンロード (123K) -
但木 稔弘2005 年 78 巻 2 号 p. 42-45
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーHigh cis-polybutadiene (BR) and high cis-polyisoprene (IR) are widely used in the industrial field such as materials for tire.
High cis-BRs prepared from Ziegler-type catalyst system are effective to take a cis configuration in high levels, however, the molecular weight distributions (Mw/Mn) of obtained BRs are fairly broad. BR having both narrow Mw/Mn and high cis configuration levels are desirable for the purpose of better abrasion resistance, higher resilience and lower heat build-up, and so on.
On the other hand, 1, 4-cis selectivity of IR synthesized with Li-, Ti- and Nd-based catalysts are still lower than NR, and their physical properties, e.g., Green strength, tensile strength or tear strength, are not satisfactory compared to NR.
Recently, several kinds of catalysis systems were investigated to achieve simultaneous control of both molecular weight distribution and cis-1, 4 specificity in the polymerization of both butadiene and isoprene. In this paper, recent trends in research on the polymerization of cis-1, 4 polybutadiene and cis-1, 4-polyisoprene are reviewed.抄録全体を表示PDF形式でダウンロード (750K) -
松田 孝昭2005 年 78 巻 2 号 p. 46-50
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーTo date, various kinds of styrene-butadiene rubber have been used in various industrial materials. These SBRs are manufactured by emulsion polymerization (radical polymerization) or solution polymerization (anionic polymerization). Anionic polymerization technique has characteristics that can design SBR structure easily. The most remarkable technology of S-SBR is to be able to introduce the functional group into SBR terminal easily. By using this technique, various modified SBRs are developed and placed on the market. Silica-filled rubber compounds show low hysteresis loss in comparison with carbon black-filled rubber compounds, and silica has been recognized as a notable filler for high performance tires with good wet grip and low rolling resistance and it is used in all over the world as reinforcing filler for tire tread. Recently, modified S-SBRs are actively developed in order to apply silica composition to tire treads material. Introduction technology of functional group draws attention as technology, which brings out the characteristic of reinforcing filler (silica, carbon black, etc.) filled composite materials. Also new modified S-SBR will be developed in future.抄録全体を表示PDF形式でダウンロード (839K) -
吉村 務, 永森 弘康2005 年 78 巻 2 号 p. 51-55
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーAcrylonitrile-butadiene rubbers (NBR) and hydrogenated crylonitrile-butadiene rubbers (HNBR) have been widely used as oil-resistant elastomers especially in automotive applications. The history of NBR is very old and has ripened as technology. However, the needs to NBR still continue, such as enhance durability, reduce environmental damage, and our contribution to the information technology. These resulted the improvement of NBR to be still is imperative. For this purpose, new NBR have recently been developed. For example, NBR for electronic products was developed by reducing metal ions. The fast-cure-type NBR was developed to increase the rubber part productivity. New technologies such as copolymerization with third monomers, a blend with other polymers and technologies to control polymer structure are applied to NBR. HNBR is excellent in heat and ozone resistances when comparing with NBR. The improvement of both heat and low-temperature resistance is always required. For applying to this demand, new low-temperature flexibility HNBR with highly hydrogenation were developed by precise control of molecular structure and hydrogenation technology. These new HNBRs are suitable applications required wide range of operational temperatures.抄録全体を表示PDF形式でダウンロード (836K) -
佐々 龍生2005 年 78 巻 2 号 p. 56-59
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーThe technical trend of automotive rubber parts made of Ethylene Propylene Terpolymer (EPDM) is discussed from the viewpoint of technical background of automotive market. This has rapidly been changed by the effect from the change in human's life style, interest in environmental preservation and the safe(ty) driving. This trend of automotive requires the change of performance of rubber parts. Parts for amenity will be expected to reduce its weight and gain the higher performance, and parts for driving mechanism will be expected to gain the higher heat resistance with reduced weight. And also, easy processing ability is going to be required to EPDM to obtain good cured rubber products in anywhere, by any mixing machines and by any operating persons.抄録全体を表示PDF形式でダウンロード (759K) -
岸根 充2005 年 78 巻 2 号 p. 60-64
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーRecent new technologies and new concepts for fluoroelastomers are reviewed. And properties of new fluoroelastomers produced by using them are reported.
A completely new polymerization technology has been developed, and new fluoroelastomers consisted of vinylidene fluoride and hexafluoropropylene are commercialized by using the new technology. One of them shows both better injection mold ability and excellent seal ability, and the other one indicates extremely superior seal ability at high temperature. It is suitable for harsh applications such as oxygen sensor seals of automobile engine.
Regarding low temperature flexible fluoroelastomers, four polymers are introduced in terms of fuel resistance and permeation. These elastomers are useful for addressing environmental requirements.
“Ultra low viscosity (ULV) Fluoroelastomer” is a new concept for fluoroelastomers. Two new ULV fluoroelastomers have been developed, a bisphenol curable type and a peroxide curable one. Peroxide curable ULV fluoroelastomer shows both high productivities such as injection mold ability and excellent physical property without a post cure.
A new compound technology of fluoroelastomer suitable for injection molding is reviewed. It shows better flow ability and mold releasing property.抄録全体を表示PDF形式でダウンロード (1060K) -
菅沼 紀之2005 年 78 巻 2 号 p. 65-68
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーSilicone rubber is a unique synthetic elastomer made from a cross-linked silicone polymer that is reinforced with silica. It has been utilized for many applications because of its excellent thermal stability, weatherability, electrical properties, durability, flame resistance, and so on, exceeding many organic elastomers.
In recent years, the following technologies were developed such as 1) fast cure type by addition cure with using capsulated Pt catalyst, 2) electrical conductive and semi-conductive rubber using carbon black, 3) thermal conductive rubber using alumina filler, 4) adhesive and selective adhesive rubber using special adhesion promoter, 5) rubber sponge by addition cure not using organic blowing agents, and 6) silicone reactive hot-melt. These applications and recent market trends were also described.抄録全体を表示PDF形式でダウンロード (2786K) -
古賀 優夫2005 年 78 巻 2 号 p. 69-72
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーAcrylic rubbers are well known in automobile industry because of their good heat resistance and oil resistance. This paper reports recent trend of acrylic rubbers reviewing past ten years' patents. As a new trend, the patents of Acrylic rubber that have special cure site system, for example carboxyl cure site, and their curing systems are applied constantly. By way of the example, we report new curing system and durability of acrylic rubber copolymerized from ethylene, vinyl acetate and acrylic esters.抄録全体を表示PDF形式でダウンロード (608K) -
大高 豊史2005 年 78 巻 2 号 p. 73-77
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーEpichlorohydrin rubber has good heat, cold, oil, and ozone resistance. It is utilized for automotives and industrial rubber using its performance.
In the automotive field, there are some request, for example, the improvement of durability, functionalize, and restriction of material. Those request come from increased temperature in engine room, automotive emission standard, and recycle etc…
On the other hand, epichlorohydrin rubber has unique semi-conductivity. This rubber is used in printer or copy machine.
It was written in this report that development for automotive use and these restriction, and development for OA machine use of epichlorohydrin rubber.抄録全体を表示PDF形式でダウンロード (797K) -
Butyl Rubbers and OthersTakashi TAKEDA2005 年 78 巻 2 号 p. 78-80
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーIsobutylene based rubbers have unique property such as impermeability to air and various gases. Main product of isobutylene based rubbers is butyl rubber, which was commercialized about 60 years before and has been used mainly for tire innertubes. Halobutyl rubbers were invented and enabled co-cure with natural rubber. The halobutyl rubbers are used mainly in tire innerliner application. To further meet market/customer requirements to butyl rubbers in various applications, star-branched butyl rubbers were developed mainly to improve processability of butyl rubbers with bimodal molecular weight distribution including star shape molecules as high molecular weight portion. And brominated Isobutylene-co-p-methylstyrene rubbers of which ozone and heat resistance were improved by the saturated backbone and cross-linking chemistry, respectively, were also commercialized. Both star-branched butyl and brominated Isobutylene-co-p-methylstyrene rubbers maintain attributes of butyl rubbers.抄録全体を表示PDF形式でダウンロード (470K) -
竹ノ下 洋一朗2005 年 78 巻 2 号 p. 81-84
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーChloroprene Rubber(CR) industry counted 70 years already after its discovery by Dr. Carothers, however CR still secures substantial portion of original market because of its well-balanced performance. This review overviews the progress in CR technology and market during the last 10 years. The major cause of declining demand is the aggressive replacement by other elastomers typically found in automotive and adhesive application. To save the situation, polymer development is focused on better storage stability of polymer in dry rubber field and longer open-time with good hot bond strength in adhesive application. Besides, latex field is being cultivated in relation to water-borne adhesives, dipped goods (especially medical disposable gloves), and asphalt modification.
Also progress are observed in a research on hydrogenated polychloroprene (HCR) and an attempt to use CR latex as material to prepare effective Al electrolytic condenser although they are still experimental stage. We see the light on CR's future at the other end of the tunnel.抄録全体を表示PDF形式でダウンロード (778K) -
垣沼 幸則2005 年 78 巻 2 号 p. 85-87
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーPolyurethane elastomers have been widely used as industrial materials and others because of their outstanding mechanical strength and abrasion resistance. Polyurethanes are composed of the three main raw materials; isocyanate, chain extender and polyol. There are a number of combinations of these raw materials. Consequently, polyurethane elastomers exhibit various characteristics according to the kinds of these components.
Polyurethane elastmers will discolor after exposure to UV light in general. In recent years, the discoloration of polyurethane has been improved by using an aliphatic diisocyanate. Generally, polyesher-based polyurethane elastmers are weak at heat aging resistance, and polyester-based polyurethane exhibits poor hydrolysis resistance. Although only the use of polycarbonatepolyol as soft-segment gives excellent properties of both heat aging and hydrolysis resistance.
In addition, characteristic polyurethanes have been reported various types such as water absorbing, biodegradation and shape memorization. Novel characteristic polyurethanes will be developed by various composite techniques.抄録全体を表示PDF形式でダウンロード (525K) -
服部 岩和, 梅津 清徳2005 年 78 巻 2 号 p. 88-89
発行日: 2005年
公開日: 2008/05/19
ジャーナル フリーPDF形式でダウンロード (367K)
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