公开(公告)号：US4320171A

公开(公告)日：1982-03-16

申请号：US150749

申请日：1980-05-19

申请人： Herbert Motz ,  August Lehner ,  Heinrich Hartmann ,  Rudolf Bachmann ,  Hans-Joerg Hartmann ,  Harald Frischmann ,  Roland Falk ,  Joachim Hack ,  Milan Velic ,  Helmut Kopke

发明人： Herbert Motz ,  August Lehner ,  Heinrich Hartmann ,  Rudolf Bachmann ,  Hans-Joerg Hartmann ,  Harald Frischmann ,  Roland Falk ,  Joachim Hack ,  Milan Velic ,  Helmut Kopke

IPC分类号： C08G18/66 ,  C09D5/23 ,  G11B5/702 ,  B32B27/40 ,  B32B5/16

CPC分类号： C08G18/6644 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/31551 ,  Y10T428/31565 ,  Y10T428/31591 ,  Y10T428/31609

摘要： Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).

摘要翻译： 磁性记录介质包括非磁性基底，并施加于基于分散在粘合剂中的细碎磁性颜料的牢固粘附的磁性涂层，所述磁性颜料含有至少50重量％的特殊聚氨酯弹性体，即热塑性聚氨酯，其为 可溶于四氢呋喃中，不含异氰酸酯基团，并且由（A）1摩尔分子量为700至2,500的含羟基的聚酯制成，（B）为0.3-3摩尔的直链脂族二醇为2 至10个碳原子，（C）0.05至0.4摩尔3至10个碳原子的三醇，和（D）1.35至4.7摩尔的6至30个碳原子的二异氰酸酯，NCO基团的量约等于 相对于组分（A）至（C）的总和的OH基团的量。