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    • 125. 发明授权
    • Magnetic recording medium
    • 磁记录介质
    • US5175048A
    • 1992-12-29
    • US765740
    • 1991-09-26
    • Hiroo InabaMasatoshi TakahashiKazuaki Taga
    • Hiroo InabaMasatoshi TakahashiKazuaki Taga
    • C09D5/23C09D127/04C09D127/06C09D175/06G11B5/702G11B5/716G11B5/842
    • G11B5/702G11B5/716Y10S428/90Y10T428/2495Y10T428/25Y10T428/257Y10T428/265
    • A magnetic recording medium comprising a non-magnetic support having at least two magnetic layers formed thereon, the at least two magnetic layers being formed by providing, in sequence, a first magnetic layer containing first ferromagnetic powder and a first binder on a surface of the non-magnetic support and then providing a second magnetic layer containing a second binder and second ferromagnetic powder while the first layer is in a wet state, the first magnetic layer containing the first binder in an amount of 10 to 27 parts by weight based on 100 parts by weight of the first ferromagnetic powder, the second magnetic layer containing the second binder in an amount of 14 to 30 parts by weight based on 100 parts by weight of the second ferromagnetic powder, the amount of the first binder contained in the first magnetic layer being smaller than that of the second binder contained in the second magnetic layer with a difference therebetween being from 0.5 to 10 parts by weight, and a ratio (A/B) of a dry thickness (A) of the first magnetic layer to a dry thickness (B) of the second magnetic layer being from 0.5 to 3.2. The magnetic recording medium is excellent in electromagnetic conversion characteristics and running stability.
    • 一种磁记录介质,包括其上形成有至少两个磁性层的非磁性载体,所述至少两个磁性层通过依次提供含有第一铁磁性粉末和第一粘结剂的第一磁性层而形成 然后提供包含第二粘合剂和第二铁磁粉末的第二磁性层,同时第一层处于湿润状态,第一磁性层含有基于100的10至27重量份的第一粘合剂 所述第一铁磁粉末的重量份,含有所述第二粘合剂的所述第二磁性层的量为基于100重量份所述第二铁磁粉末为14〜30重量份,所述第一磁性体中含有的所述第一粘合剂的量 层比第二磁性层中包含的第二粘合剂的层小,其间的差值为0.5〜10重量份,并且ra 第一磁性层的干厚度(A)至第二磁性层的干厚度(B)的tio(A / B)为0.5至3.2。 磁记录介质具有优异的电磁转换特性和运行稳定性。
    • 127. 发明授权
    • Method of producing a magnetic recording medium
    • 制造磁记录介质的方法
    • US5073406A
    • 1991-12-17
    • US682767
    • 1991-04-09
    • Masatoshi TakahashiHiroo InabaKazuaki Taga
    • Masatoshi TakahashiHiroo InabaKazuaki Taga
    • G11B5/716G11B5/842
    • G11B5/716G11B5/842
    • A method of producing a magnetic recording medium comprises the steps of kneading and dispersing ferromagnetic powder, binder and non-ferromagnetic powder to obtain magnetic coating solutions, and applying a plurality of the magnetic coating solutions on a non-ferromagnetic substrate to form a plurality of magnetic layers on the substrate. In the kneading and dispersing step, a magnetic coating composition containing a ferromagnetic powder and a solvent of 15 to 30 wt % of the ferromagnetic powder is kneaded by a two-shaft continuous kneading and mixing machine and then dispersed by a pin type sand grinder to obtain a first magnetic solution. Another magnetic coating composition containing a ferromagnetic powder and a solvent of 30 to 50 wt % of the ferromagnetic powder is kneaded by a double-arm open kneader and then dispersed by a pin type sand grinder, and finally dispersed by a disk type sand grinder to obtain a second magnetic coating solution. In the magnetic solution applying step, the first magnetic coating solution is at first applied on said substrate and then the second magnetic coating solution is applied thereon.
    • 一种制造磁记录介质的方法包括以下步骤:将铁磁性粉末,粘合剂和非铁磁性粉末混合和分散以获得磁性涂层溶液,并将多个磁性涂覆溶液施加在非铁磁性基底上以形成多个 基底上的磁性层。 在捏合分散工序中,将含有铁磁性粉末和15〜30重量%的铁磁粉末的溶剂的磁性涂料组合物通过双轴连续捏合混合机进行混炼,然后用针式砂磨机分散 获得第一磁性溶液。 含有铁磁性粉末和铁磁性粉末的含量为30〜50重量%的溶剂的磁性涂料组合物用双臂开口捏合机捏合,然后用针式砂磨机分散,最后用盘式砂磨机分散 获得第二磁性涂层溶液。 在磁性溶液涂布步骤中,首先将第一磁性涂布溶液涂布在所述基材上,然后将第二磁性涂布液涂布在其上。
    • 130. 发明授权
    • Aqueous high concentration surfactant slurry containing an olefin
sulfonate
    • 含有烯烃磺酸盐的含水高浓度表面活性剂浆料
    • US4715991A
    • 1987-12-29
    • US848051
    • 1986-04-04
    • Yoshie HirakouchiOsamu ToisawaMasatoshi Takahashi
    • Yoshie HirakouchiOsamu ToisawaMasatoshi Takahashi
    • B01F17/02C11D1/83C11D3/43C11D1/14
    • C11D1/83C11D1/143Y10S516/02Y10S516/03
    • An aqueous high concentration surfactant slurry comprising:(A) 50% to 75% by weight of C.sub.12 -C.sub.20 olefin sulfonates substantially composed of 8 to 60 parts by weight of at least one vinylidene type olefin sulfonate and 92 to 40 parts by weight of at least one linear olefin sulfonate;(B) 1% to 5% by weight of sodium chloride, potassium chloride, or a mixture thereof;(C) 0.3% to 5% by weight of at least one nonionic substance selected from the group consisting of (C-1) polyoxypropylene glycols having an average molecular weight of 170 to 300, (C-2) ethylene oxide addition products of secondary higher alcohols having a C.sub.7 -C.sub.18 alkyl group and an average addition mole number of ethylene oxide of 7 to 12, and (C-3) addition products of ethylene oxide (i.e., an average addition mole number of 3 to 10) and propylene oxide (i.e., an average addition mole number of 1 to 9) of secondary higher alcohols having a C.sub.7 -C.sub.18 alkyl group provided that the total addition mole number of the ethylene oxide and the propylene oxide is 6 to 12.This aqueous high concentration surfactant slurry has a low viscosity at room temperature. Therefore, the slurry can be efficiently stored and the costs necessary for packaging, transporting, and storing the slurry can be advantageously decreased.
    • 一种含水高分子表面活性剂浆料,其包含:(A)50%至75%重量的基本上由8至60重量份的至少一种亚乙烯基型烯烃磺酸盐和92至40重量份的 至少一种直链烯烃磺酸盐; (B)1重量%至5重量%的氯化钠,氯化钾或其混合物; (C)0.3〜5重量%的选自平均分子量为170〜300的(C-1)聚氧丙烯二醇,(C-2)二次环氧乙烷加成物的至少一种非离子物质 具有C7-C18烷基和环氧乙烷平均加成摩尔数为7-12的高级醇和环氧乙烷加成产物(即平均加成摩尔数为3至10)和环氧丙烷(C-3) (即,平均加成摩尔数为1〜9)具有C7-C18烷基的二级高级醇,条件是环氧乙烷和环氧丙烷的总加成摩尔数为6〜12。该高浓度水性表面活性剂浆料 在室温下具有低粘度。 因此,可以有效地储存浆料,并且可以有利地降低包装,运输和储存浆料所需的成本。