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    • 6. 发明授权
    • Particles containing iron carbide
    • 含有碳化铁的颗粒
    • US5437805A
    • 1995-08-01
    • US134873
    • 1993-10-12
    • Takuya AraseYoshiyuki ShibuyaShigeo Daimon
    • Takuya AraseYoshiyuki ShibuyaShigeo Daimon
    • B01J27/22C01B31/30G11B5/706
    • B01J27/22C01B31/301G11B5/70615G11B5/70626G11B5/70642C01P2002/72C01P2002/77C01P2004/10C01P2004/54C01P2004/61C01P2004/62C01P2006/42C01P2006/80
    • The present invention provides acicular particles (A) containing an iron carbide, which have (a) a free carbon content of at most 20 wt. %, and (b) and Fe.sub.5 C.sub.2 ratio(x) of at least 70% and a coercive force of 3.times.+300 to 7.times.+270 Oe, the ratio(x) being expressed by ##EQU1## where S1 is the X-ray diffraction strength of Fe.sub.5 C.sub.2, and S2 is the X-ray diffraction strength of Fe.sub.3 O.sub.4.The invention further provides particles (B) containing nickel and an iron carbide.The invention further provides acicular particles containing an iron carbide which are obtained by heating an aqueous dispersion of ferric hydroxide in an alkaline system in the presence of a water-soluble compound capable of coordinating to iron to obtain acicular .alpha.-ferric oxide and contacting the product with a carbon-containing reducing-and-carburizing agent or with a mixture of the agent and a carbon-free reducing agent, with or without contacting the product with the carbon-free reducing agent.These particles (A) and (C) are controllable in coercive force and usable for magnetic record media of various standards.
    • 本发明提供了含有碳化铁的针状粒子(A),其具有(a)游离碳含量至多为20重量% %,(b)和Fe5C2比(x)至少为70%,矫顽力为3x + 300〜7×270ee,比例(x)由表示,其中S1为X射线衍射 Fe5C2的强度,S2是Fe3O4的X射线衍射强度。 本发明还提供含有镍和碳化铁的颗粒(B)。 本发明还提供了含有碳化铁的针状颗粒,其通过在碱性体系中在能够与铁配位的水溶性化合物的存在下加热氢氧化铁的水分散体而获得,得到针状的α-氧化铁并与产物接触 与含碳还原和渗碳剂或与该试剂和不含碳的还原剂的混合物,与或不使该产物与无碳还原剂接触。 这些颗粒(A)和(C)在矫顽力方面是可控的,可用于各种标准的磁记录介质。
    • 7. 发明授权
    • Process for the production of water-soluble fluorine-containing vinyl ethers
    • 生产水溶性含氟乙烯基醚的方法
    • US07321071B2
    • 2008-01-22
    • US10517667
    • 2003-06-16
    • Kenji IshiiNoriyuki ShinokiTakuya AraseKazuyoshi IchiharaToshiya Mantani
    • Kenji IshiiNoriyuki ShinokiTakuya AraseKazuyoshi IchiharaToshiya Mantani
    • C07C17/00C07C17/25
    • C07C303/22C07C309/10
    • The present invention relates to a method for producing a water-soluble fluorine-containing vinyl ether which comprises subjecting a fluorine-containing 2-alkoxypropionic acid derivative represented by the following general formula (I): (wherein A represents —OM1 or —OM21/2, and M1 represents an alkali metal and M2 represents an alkaline earth metal; X represents a halogen atom; Y1 and Y2 are the same or different and each represents a fluorine atom, a chlorine atom, a perfluoroalkyl group or a fluorochloroalkyl group; n represents an integer of 0 to 3, and n of Y1s may be the same or different; m represents an integer of 1 to 5, and m of Y2s are the same or different; and Z represents a hydrophilic group) to thermal decomposition at a temperature of not lower than 50° C. but lower than 170° C. in the presence of a coordinating organic solvent to give a water-soluble fluorine-containing vinyl ether represented by the general formula (II): (wherein Y1, Y2, Z, n and m are as defined above), said coordinating organic solvent having a coordinating property with an ion of said M1 or an ion of said M2 said coordinating organic solvent being in an amount of 10 to 1,000 parts by mass per 100 parts by mass of the fluorine-containing 2-alkoxypropionic acid derivative.
    • 本发明涉及一种水溶性含氟乙烯醚的制造方法,其特征在于,将下述通式(I)表示的含氟2-烷氧基丙酸衍生物:(式中,A表示-OM1 或或-OM 2 1/2,M 1表示碱金属和M 2 表示碱土金属; X表示卤素原子; Y 1和Y 2相同或不同,表示氟原子,氯原子,全氟烷基 或氟氯烷基; n表示0〜3的整数,Y 1的n可以相同或不同,m表示1〜5的整数,y表示0〜 2个相同或不同; Z表示亲水基团)在不低于50℃但低于170℃的温度下在配位有机溶剂的存在下进行热分解,得到 水溶性含氟 由通式(II)表示的乙烯基醚:其中Y 1,Y 2,Z,n和m如上所定义),所述配位有机溶剂具有 与所述M 1的离子或所述M 2的所述配位有机溶剂的离子的配位性为每100质量份为10〜1000质量份 的含氟2-烷氧基丙酸衍生物。