公开(公告)号：US4743501A

公开(公告)日：1988-05-10

申请号：US935517

申请日：1986-11-26

申请人： Kenichiro Eguchi ,  Kazuhiro Kuroda ,  Ryoichi Awano

发明人： Kenichiro Eguchi ,  Kazuhiro Kuroda ,  Ryoichi Awano

IPC分类号： G11B5/702 ,  G11B5/714

CPC分类号： G11B5/7023 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/31935

摘要： In a magnetic recording medium wherein a magnetic coating composition comprising a binder and a magnetic powder is applied to the surface of a substrate, the dispersion of magnetic powder in binder is improved for enhanced physical and electromagnetic properties by using a vinyl chloride/hydroxyl group-containing vinyl monomer/polar group-containing monomer copolymer or a vinyl chloride/vinyl acetate/hydroxyl group-containing vinyl monomer/polar group-containing monomer copolymer having not been subjected to saponification, the polar group-containing monomer preferably containing an epoxy group as an additional polar group. Electromagnetic properties are further improved with a metal magnetic powder having a BET value of up to 60 m.sup.2 /g and a pH value of at least 7.

摘要翻译： 在其中将包含粘合剂和磁性粉末的磁性涂料组合物施加到基材表面的磁记录介质中，通过使用氯乙烯/羟基基团，改善磁性粉末在粘合剂中的分散性，以提高物理和电磁特性， 含有乙烯基单体/含极性基团的单体共聚物或未经皂化的含氯乙烯/乙酸乙烯酯/含羟基的乙烯基单体/含极性基团的单体共聚物，优选含有环氧基的含极性基团的单体作为 一个额外的极地组。 使用BET值高达60m2 / g，pH值至少为7的金属磁性粉末进一步改善电磁特性。