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61 条记录 (耗时 0.024 秒)

    Method for preparing hexamethyl cyclotrisilazane
    1.
    发明授权
    Method for preparing hexamethyl cyclotrisilazane 失效
    制备十六烷基环己烷的方法

    公开(公告)号：US5075474A

    公开(公告)日：1991-12-24

    申请号：US679199

    申请日：1991-04-02

    申请人： Hiromi Ohsaki ,  Yoshihumi Takeda ,  Toshinobu Ishihara ,  Akira Hayashida

    发明人： Hiromi Ohsaki ,  Yoshihumi Takeda ,  Toshinobu Ishihara ,  Akira Hayashida

    IPC分类号： B01J31/02 ,  C07F7/10 ,  C07F7/21

    CPC分类号： C07F7/21

    摘要： According to the method for preparing hexamethyl cyclotrisilazane of the present invention, hexamethyl cyclotrisilazane can be obtained by heating a linear or cyclic silazane compound represented by the following general formula:--(Me.sub.2 SiNH).sub.n --(wherein Me represents a methyl group and n is an integer of not less than 4) in the presence of at least one catalytic compound selected from the group consisting of ammonium salts of arylsulfonic acids and/or aminoarylsulfonic acids and the resulting hexamethyl cyclotrisilazane represented by the formula: --Me.sub.2 SiNH).sub.3 -- can be recovered by distilling off the same outside the reaction system. According to the method of the present invention, highly pure hexamethyl cyclotrisilazane can be industrially prepared in good efficiency and in a high yield. In particular, if octamethyl cyclotetrasilazane which can be industrially prepared from cheap dimethyldichlorosilane is used as a starting material, hexamethyl cyclotrisilazane can also be prepared at a low cost. Thus, the method of the present invention has enough practical value in the organic silicon industries.

    Precursor composition of silicon carbide
    3.
    发明授权
    Precursor composition of silicon carbide 失效
    前体组成的碳化硅

    公开(公告)号：US4657991A

    公开(公告)日：1987-04-14

    申请号：US787328

    申请日：1985-10-15

    申请人： Minoru Takamizawa ,  Taishi Kobayashi ,  Toshinobu Ishihara ,  Yoshihumi Takeda ,  Akira Hayashida

    发明人： Minoru Takamizawa ,  Taishi Kobayashi ,  Toshinobu Ishihara ,  Yoshihumi Takeda ,  Akira Hayashida

    IPC分类号： C08L83/00 ,  C04B35/571 ,  C08G79/00 ,  C08L83/02 ,  C08L83/16 ,  D01F9/10 ,  C08F283/00

    CPC分类号： C08G79/00 ,  C04B35/571 ,  C08L83/16

    摘要： The precursor composition of silicon carbide fibers provided by the invention has greatly improved spinnability and can be spun at a very high spinning velocity to give a green filament which has a much larger tensile strength than those of conventional precursor materials and is capable of giving silicon carbide fibers having increased tensile strength by the infusibilization and calcination of the green filament of the composition under tension. The composition comprises from 80 to 99.9 parts by weight of a polycarbosilane polymer and from 20 to 0.01 part by weight of a silmethylene polymer having a degree of polymerization larger than the specified lower limit.

    摘要翻译： 由本发明提供的碳化硅纤维的前体组合物大大提高了可纺性，并且可以以非常高的纺丝速度纺丝，得到具有比常规前体材料高的拉伸强度的绿色长丝，并且能够提供碳化硅 纤维通过在张力下的组合物的绿色细丝的不熔化和煅烧而具有增加的拉伸强度。 该组合物包含80-99.9重量份的聚碳硅烷聚合物和20至0.01重量份具有大于规定下限的聚合度的硅亚甲基聚合物。

    Process for manufacturing organic silazane polymers and ceramics therefrom
    4.
    发明授权
    Process for manufacturing organic silazane polymers and ceramics therefrom 失效
    从其制造有机硅氮烷聚合物和陶瓷的方法

    公开(公告)号：US4869854A

    公开(公告)日：1989-09-26

    申请号：US114111

    申请日：1987-10-27

    申请人： Yoshihumi Takeda ,  Minoru Takamizawa ,  Akira Hayashida

    发明人： Yoshihumi Takeda ,  Minoru Takamizawa ,  Akira Hayashida

    IPC分类号： C03B8/02 ,  C04B35/571 ,  C04B35/589 ,  C08G77/62 ,  C08L83/16

    CPC分类号： C08L83/16 ,  C04B35/571 ,  C04B35/589 ,  C08G77/62

    摘要： A process for manufacturing an organic silazane polymer which comprises reacting ammonia with a mixture of at least one compound selected from the group consisting of organic silicon compounds of the following formulae (I) and (II) ##STR1## and at least one compound selected from the group consisting of organic silicon compounds of the following formula (III) ##STR2## in which R represents hydrogen, chlorine, bromine, methyl radical, ethyl radical, phenyl radical or vinyl radical, R.sub.1 represents hydrogen or methyl radical, R.sub.2 represents hydrogen, methyl radical, ethyl radical, phenyl radical or vinyl radical and X represents chlorine or bromine; to obtain an ammonolysis product. The ammonolysis product is polymerized in the presence of a basic catalyst capable of deprotonation to obtain an organic silazane polymer. The silazane polymer may be further melted, shaped and infusibilized. The thus infusibilized product is finally sintered to obtain a ceramic material.

    摘要翻译： 一种制备有机硅氮烷聚合物的方法，其包括使氨与至少一种选自下式（I）和（II）的有机硅化合物的化合物的混合物反应：（IMA） II）和选自下式（III）的有机硅化合物（III）中的至少一种化合物，其中R表示氢，氯，溴，甲基，乙基，苯基或乙烯基 R1表示氢或甲基，R2表示氢，甲基，乙基，苯基或乙烯基，X表示氯或溴; 以获得氨解产物。 氨解产物在能够去质子化的碱性催化剂存在下聚合，得到有机硅氮烷聚合物。 硅氮烷聚合物可以进一步熔融，成型和不熔化。 将这样的不熔化产物最终烧结得到陶瓷材料。

    Method for the preparation of an inorganic fiber containing silicon, carbon, boron and nitrogen
    9.
    发明授权
    Method for the preparation of an inorganic fiber containing silicon, carbon, boron and nitrogen 失效
    制备含有硅，碳，硼和氮的无机纤维的方法

    公开(公告)号：US4604367A

    公开(公告)日：1986-08-05

    申请号：US682796

    申请日：1984-12-18

    申请人： Minoru Takamizawa ,  Taishi Kobayashi ,  Akira Hayashida ,  Yoshihumi Takeda

    发明人： Minoru Takamizawa ,  Taishi Kobayashi ,  Akira Hayashida ,  Yoshihumi Takeda

    IPC分类号： D01F9/10 ,  C04B35/571 ,  C08G79/00 ,  C08G79/08 ,  D01F9/08 ,  C04B35/02

    CPC分类号： D01F9/08 ,  C04B35/571 ,  C08G79/08

    摘要： The invention provides a novel inorganic fiber composed of the elements of silicon, carbon, boron and nitrogen of which the Si/B molar ratio is 2:1 to 200:1. The inorganic fiber is obtained by a method comprising the steps of: (a) preparing an organoborosilicon polymer by heating a mixture of an organopolysilane and an organoborazine compound, e.g. B-trimethyl-N-triphenyl borazine, to effect thermal decomposition and polycondensation reaction; (b) spinning the polymer into a fibrous form; (c) infusibilizing the fiber of the polymer by thermally oxidizing in an oxidizing atmosphere or by irradiating with ionizing radiations; and (d) calcining the infusibilized fiber at 900.degree. to 1800.degree. C. The inventive inorganic fiber is more stable at high temperatures than conventional silicon carbide fibers.

    摘要翻译： 本发明提供一种由硅，碳，硼和氮元素组成的新型无机纤维，Si / B摩尔比为2：1至200：1。 无机纤维通过包括以下步骤的方法获得：（a）通过加热有机聚硅烷和有机硼嗪化合物的混合物制备有机硼硅聚合物，例如 B-三甲基-N-三苯基环硼氮烷进行热分解和缩聚反应; （b）将聚合物纺丝成纤维状; （c）通过在氧化气氛中热氧化或通过照射电离辐射来使聚合物的纤维熔融化; 和（d）在900〜1800℃煅烧不熔化纤维。本发明的无机纤维在高温下比常规碳化硅纤维更稳定。