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    Polytetrafluoroethylene fine powder and process for producing the same
    2.
    发明授权
    Polytetrafluoroethylene fine powder and process for producing the same 失效
    聚四氟乙烯细粉及其制造方法

    公开(公告)号：US4159370A

    公开(公告)日：1979-06-26

    申请号：US850539

    申请日：1977-11-11

    申请人： Shun Koizumi ,  Shigeru Ichiba ,  Tetsuo Simizu ,  Chuzo Okuno ,  Tosinori Kadowaki ,  Katsutoshi Yamamoto

    发明人： Shun Koizumi ,  Shigeru Ichiba ,  Tetsuo Simizu ,  Chuzo Okuno ,  Tosinori Kadowaki ,  Katsutoshi Yamamoto

    IPC分类号： C08F14/00 ,  C08F2/00 ,  C08F2/16 ,  C08F2/18 ,  C08F14/26 ,  C08F214/26 ,  C08J3/12 ,  C08F114/26

    CPC分类号： C08F14/26

    摘要： Polytetrafluoroethylene fine powders which have an average molecular weight of not less than 5,000,000, preferably not less than 5,500,000, an amorphous index of not more than 0.1, preferably not more than 0.09, a number average primary particle size of 0.1 to 0.4 micron, preferably 0.15 to 0.38 micron, and a sharp endothermic peak at a temperature between 343.degree. C. and 350.degree. C. on the melting diagram by a differential scanning calorimeter, said sharp peak having an endothermic ratio of not more than 0.3, preferably not more than 0.27, and a half value width of the endothermic peak of not more than 8 degrees, preferably not more than 6 degrees, and a process for producing the polytetrafluoroethylene fine powders. The polytetrafluoroethylene fine powders have an excellent stretchability and are useful for electric wire coating, small diameter tubes, large diameter tubes, sealing tapes and the like.

    摘要翻译： 平均分子量不小于5,000,000，优选不小于5,500,000的聚四氟乙烯细粉末，数均一次粒径为0.1〜0.4微米，优选为0.15以下的无定形指数为0.1以下，优选为0.09以下 通过差示扫描量热计在熔点上在343℃和350℃之间的温度下具有尖锐的吸热峰，所述尖峰的吸热比不大于0.3，优选不大于0.27 ，吸热峰的半值宽度为8度以下，优选为6度以下，以及聚四氟乙烯细粉的制造方法。 聚四氟乙烯细粉末具有优异的拉伸性，可用于电线涂布，小直径管，大直径管，密封带等。

    Process for preparing polytetrafluoroethylene fine powders
    3.
    发明授权
    Process for preparing polytetrafluoroethylene fine powders 失效
    制备聚四氟乙烯精细粉末的方法

    公开(公告)号：US4098975A

    公开(公告)日：1978-07-04

    申请号：US776919

    申请日：1977-03-11

    申请人： Tetsuo Shimizu ,  Shigeru Ichiba ,  Shun Koizumi ,  Chuzo Okuno

    发明人： Tetsuo Shimizu ,  Shigeru Ichiba ,  Shun Koizumi ,  Chuzo Okuno

    IPC分类号： C08F2/00 ,  C08F2/16 ,  C08F2/18 ,  C08F14/00 ,  C08F14/26

    CPC分类号： C08F14/26

    摘要： A process for preparing a polytetrafluoroethylene fine powder by polymerizing tetrafluoroethylene in an aqueous medium containing a polymerization initiator and a dispersant, coagulating the resulting polymer, washing the coagulated polymer when desired, and drying the polymer, characterized in that after at least 30 wt. % of the whole amount of the tetrafluoroethylene to be polymerized has been polymerized at a constant temperature, the polymerization is conducted at an altered temperature at which the same whole amount, when polymerized, gives a polymer having an amorphous index at least 0.01 higher than when the whole amount is polymerized at the first-mentioned temperature.

    Process for preparing polytetrafluoroethylene fine powder
    4.
    发明授权
    Process for preparing polytetrafluoroethylene fine powder 失效
    制备聚四氟乙烯细粉的工艺

    公开(公告)号：US4363900A

    公开(公告)日：1982-12-14

    申请号：US268835

    申请日：1981-06-01

    申请人： Tetsuo Shimizu ,  Shun Koizumi

    发明人： Tetsuo Shimizu ,  Shun Koizumi

    IPC分类号： C08J3/12 ,  C08F2/00 ,  C08F2/22 ,  C08F2/30 ,  C08F2/38 ,  C08F2/40 ,  C08F14/00 ,  C08F14/26 ,  C08F114/26 ,  C08F114/18

    CPC分类号： C08F114/26 ,  Y10T428/2982

    摘要： A process for preparing polytetrafluoroethylene fine powder by polymerization of tetrafluoroethylene in an aqueous medium comprising a water-soluble polymerization initiator and a non-telogenic surfactant capable of keeping colloidal polytetrafluoroethylene particles at a sufficiently stable state, characterized in that the polymerization is carried out at a temperature of 55.degree. to 120.degree. C., and a polymerization retarder chosen from aromatic hydroxy compounds, aromatic amino compounds and quinone compounds which has a water-solubility of not less than 2.5.times.10.sup.-6 mol/liter at 25.degree. C. and does not have any reinitiation ability after its addition or chain transfer to a free radical in the polymerization system is incorporated in the aqueous medium in an amount of 0.7 to 20 ppm at the stage after the initiation of the polymerization and after the consumption of at least 10% by weight of tetrafluoroethylene to be polymerized but before the consumption of 85% by weight of tetrafluoroethylene to be polymerized so that the polymerization time is extended at least 130% in comparison with that of the case wherein the polymerization is effected under the same conditions as above except not using the polymerization retarder, whereby colloidal polytetrafluoroethylene particles, of which the core portions occupying 50% by weight of the total weight of the finally produced particles have a specific gravity of not more than 2.210, of which the specific gravity of the finally produced particles is not more than that of the core portions and of which the average particle size is 0.1 to 0.5 .mu.m, are obtained.

    摘要翻译： 一种通过在含有水溶性聚合引发剂的水性介质中四氟乙烯聚合制备聚四氟乙烯细粉的方法，其能够使胶态聚四氟乙烯颗粒保持在足够稳定的状态，其特征在于聚合反应在 温度为55〜120℃，选自芳香族羟基化合物，芳香族氨基化合物和醌化合物的聚合缓凝剂，其在25℃下的水溶性为2.5×10 -6 mol /升以上， 在聚合体系中添加或链转移到自由基后，在聚合反应开始后的阶段以0.7至20ppm的量掺入水性介质中，并且在消耗至少10 重量％的四氟乙烯待聚合，但在消耗85重量％的四氟乙基之前 烯聚合时间相对于在与上述相同的条件下进行聚合的情况下，聚合时间延长至少130％，除了不使用聚合延迟剂之外，其中胶体聚四氟乙烯颗粒的核心部分 占最终生产的颗粒总重量的50重量％的比重不大于2.210，其中最终生产的颗粒的比重不大于芯部的比重，其平均粒径 为0.1〜0.5μm。

    Illuminating device
    5.
    发明授权
    Illuminating device 失效
    照明装置

    公开(公告)号：US4733332A

    公开(公告)日：1988-03-22

    申请号：US855068

    申请日：1986-03-27

    申请人： Hiroshi Yamashita ,  Kanenaga Fujii ,  Junji Hayakawa ,  Toru Komiyama ,  Shun Koizumi

    发明人： Hiroshi Yamashita ,  Kanenaga Fujii ,  Junji Hayakawa ,  Toru Komiyama ,  Shun Koizumi

    IPC分类号： F21V8/00 ,  F25D27/00 ,  F21V7/04

    CPC分类号： G02B6/001 ,  F25D27/00

    摘要： This invention provides an illuminating device characterized in that the device comprises a light-transmitting rod for transmitting the light incident on one end thereof toward the otehr end, a diffusion pattern formed on the outer peripheral surface of the rod by adhering a fine powder of high refractive index in the shape of a line extending continuously or discretely axially of the rod, and a transparent protective tube covering the peripheral surface of the rod with a circumferential clearance formed between the rod and the tube, the clearance between the rod and the protective tube being sealed off at opposite ends thereof.

    摘要翻译： PCT No.PCT / JP85 / 00081 Sec。 371日期：1986年3月27日 102（e）1986年3月27日PCT PCT日期：1985年2月22日。本发明提供了一种照明装置，其特征在于，该装置包括透光杆，用于将入射到其一端的光朝向端部传送， 扩散图案形成在棒的外周表面上，该方法是通过将棒的连续或离散延伸的线形状的高折射率微细粉末粘附在一起，并且覆盖杆的圆周表面的透明保护管 杆和管之间形成的间隙，杆与保护管之间的间隙在其相对端密封。

    Reinforced air-pervious polytetrafluorothylene sheet
    6.
    发明授权
    Reinforced air-pervious polytetrafluorothylene sheet 失效
    增强透气聚四氟乙烯板

    公开(公告)号：US3960651A

    公开(公告)日：1976-06-01

    申请号：US388724

    申请日：1973-08-16

    申请人： Yutaka Kometani ,  Shun Koizumi ,  Kazuo Kubota ,  Takeaki Nawazima

    发明人： Yutaka Kometani ,  Shun Koizumi ,  Kazuo Kubota ,  Takeaki Nawazima

    IPC分类号： B01D39/16 ,  B29C67/04 ,  B32B27/30 ,  C08J5/04 ,  C08J5/18 ,  C08J9/28 ,  C25B13/08 ,  B32B15/02

    CPC分类号： C08J5/18 ,  B01D17/10 ,  B01D39/163 ,  C08J5/04 ,  C08J9/28 ,  D21H5/20 ,  C08J2327/18 ,  Y10T428/3154 ,  Y10T442/121

    摘要： An air-pervious sheet predominantly of polytetrafluoroethylene, the sheet being reinforced by being fused to a liquid-pervious reinforcing material layer which is capable of retaining its original form even when heated to a temperature of 270.degree. to 280.degree. C. The sheet preferably consists of a polytetrafluoroethylene fibrous powder having an average fiber length of 100 to 5,000 microns, an average shape factor of not less than 10, and an anisotropic expansion factor of 1.30 to 7.00 adhered by means of molten polytetrafluoroethylene having an average particle diameter of 0.05 to 0.5 microns to a liquid-pervious reinforcing material layer which is capable of retaining its original form even when heated to a temperature of 270.degree. C. to 380.degree. C.

    摘要翻译： 一种主要由聚四氟乙烯制成的透气性片材，该片材通过熔融到可透液性增强材料层而被加强，该增强材料层即使在加热到270℃至280℃的温度时也能保持其原始形式。该片材优选地 的平均纤维长度为100〜5000微米，平均形状因子不小于10的聚四氟乙烯纤维粉末和平均粒径为0.05〜0.5的熔融聚四氟乙烯粘附的各向异性膨胀系数为1.30〜7.00的聚四氟乙烯纤维粉末 微米的液体渗透性增强材料层，即使在加热至270℃至380℃的温度下也能保持其原始形式。

    Fluoroelastomer composition
    7.
    发明授权
    Fluoroelastomer composition 失效
    氟弹性体组合物

    公开(公告)号：US3951913A

    公开(公告)日：1976-04-20

    申请号：US462427

    申请日：1974-04-19

    申请人： Yutaka Kometani ,  Shun Koizumi ,  Takeshi Suzuki ,  Yasuyoshi Furukawa ,  Masayasu Tomoda ,  Kiyoichi Kondo

    发明人： Yutaka Kometani ,  Shun Koizumi ,  Takeshi Suzuki ,  Yasuyoshi Furukawa ,  Masayasu Tomoda ,  Kiyoichi Kondo

    IPC分类号： C08L27/12 ,  C08K3/00 ,  C08K5/04 ,  C08K5/05 ,  C08K5/17 ,  C08K5/34 ,  C08K13/02 ,  C08L1/00 ,  C08L27/00 ,  C08F8/30

    CPC分类号： C08K13/02 ,  C08K3/22 ,  C08K5/18 ,  C08K5/34

    摘要： A fluoroelastomer composition which contains (a) a fluoroelastomer, (b) at least one metal compound selected from the group consisting of bivalent metal oxide, bivalent metal hydroxide and mixture of bivalent metal oxide or metal hydroxide with metal salt of weak acid, (c) an aromatic polyhydroxy compound, (d) a quaternary ammonium compound of 8-alkyl- or 8-aralkyl-1,8-diaza-bicyclo[5.4.0]-7-undecenium, and (e) 1,8-diaza-bicyclo[5.4.0]-7-undecene in an amount of not more than 0.07 part by weight per 100 parts by weight of fluoroelaster, provides a fluoro-rubber having a low compression set and an excellent elastic property. The fluoroelastomer composition can be handled and processed with safety, and yet can be cured with an appropriate induction time and a good cure rate, and has excellent storage properties.

    摘要翻译： 一种含氟弹性体组合物，其含有（a）含氟弹性体，（b）选自二价金属氧化物，二价金属氢氧化物和二价金属氧化物或金属氢氧化物与弱酸金属盐的混合物中的至少一种金属化合物，（c ）芳族多羟基化合物，（d）8-烷基 - 或8-芳烷基-1,8-二氮杂 - 双环[5.4.0] -7-十一碳烯的季铵化合物和（e）1,8-二氮杂 - 双环[5.4.0] -7-十一碳烯，相对于100重量份的氟橡胶，不大于0.07重量份，提供了具有低压缩永久变形性和优异弹性的氟橡胶。 含氟弹性体组合物可以安全地处理和加工，并且可以以适当的诱导时间和良好的固化速率固化，并且具有优异的储存性能。