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    • 8. 发明授权
    • Method of making transparent magnetic recording layers
    • 制造透明磁记录层的方法
    • US5520954A
    • 1996-05-28
    • US401518
    • 1995-03-10
    • George L. OlteanRobert O. JamesBrian S. WhiteDavid B. Bailey
    • George L. OlteanRobert O. JamesBrian S. WhiteDavid B. Bailey
    • G11B5/633G11B5/00
    • G11B5/633Y10S428/90Y10T428/25Y10T428/273Y10T428/31768
    • A method of making a transparent magnetic recording layer which comprises forming a concentrated aqueous magnetic dispersion (A) of from 10 to 50 percent by weight ferromagnetic particles having a specific surface area of at least 30 m.sup.2 /gm and from 0.5 to 20 percent by weight of a dispersing agent; adding the concentrated aqueous magnetic dispersion (A) to a viscosity increasing hydrophilic polymer in water (B) such that the concentration of the hydrophilic cobinder is from 0.5 to 3 percent by weight based on the total weight of (A) and (B); diluting the resulting dispersion (A) plus (B) with water to give a dispersion (C) having a concentration of from 0.5 to 5 percent by weight of ferromagnetic particles; preparing a final dispersion by adding to the dispersion (C) from 20 to 200 parts per 100 parts of dispersion (C) of an aqueous deionized gelatin solution having a pH value from 7 to 10 and containing from 2 to 15 percent by weight of gelatin and coating the final dispersion onto a substrate to give a dry coverage of from 700 mg/m.sup.2 to 3000 mg/m.sup.2 of solids.
    • 一种透明磁记录层的制造方法,其特征在于,形成浓度为10〜50重量%的比表面积为30m 2 / g以上且0.5〜20重量%的铁磁性颗粒的浓缩水性磁性分散体(A) 的分散剂; 将浓缩的水性磁性分散体(A)加入到水(B)中的增粘亲水性聚合物中,使得亲水性助磨剂的浓度为(A)和(B)的总重量的0.5〜3重量%。 用水稀释所得分散体(A)加(B),得到浓度为铁磁颗粒重量的0.5-5%的分散体(C); 通过向分散体(C)添加20至200份/ 100份分散体(C)的分散体(C),其分散体(C)为pH值为7至10的含水去离子明胶溶液,并含有2至15重量%的明胶 并将最终分散体涂布在基材上,得到700mg / m 3至3000mg / m 2固体的干覆盖。