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公开(公告)号：US4690864A
公开(公告)日：1987-09-01
申请号：US919021
申请日：1986-10-15
CPC分类号： G11B5/71 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/257 , Y10T428/265
摘要： A magnetic recording disc having a high durability and being rotatively driven with small starting torque which comprises a non-magnetic support and a magnetic layer provided on at least one surface of the support, the magnetic layer comprising magnetic powder, a resinous binder, (a) an ester of an unsaturated fatty acid of 8 to 18 carbon atoms with a monovalent or polyvalent, saturated or unsaturated alcohol of not more than 18 carbon atoms optionally substituted with at least one alkoxy group having not more than 8 carbon atoms and (b) a fatty acid ester of the formula: ##STR1## wherein R.sub.1 is a saturated or unsaturated aliphatic hydrocarbon group having 8 to 18 carbon atoms, R.sub.2 is an alkyl group having not more than 18 carbon atoms and n is an integer of 1 or more, the combined amount of the unsaturated fatty acid ester (a) and the fatty acid ester (b) being not less than 5 parts by weight to 100 parts by weight of the magnetic powder.
摘要翻译： 一种磁性记录盘，其具有高的耐久性并且以小的起动转矩旋转地驱动，该磁性记录盘包括设置在载体的至少一个表面上的非磁性载体和磁性层，所述磁性层包含磁性粉末，树脂粘合剂，（ ）8-18个碳原子的不饱和脂肪酸的酯与任选被至少一个不超过8个碳原子的烷氧基取代的不超过18个碳原子的一价或多价饱和或不饱和醇，和（b） 下式的脂肪酸酯：其中R1是具有8至18个碳原子的饱和或不饱和脂族烃基，R2是不大于18个碳原子的烷基，n是1或更大的整数， 不饱和脂肪酸酯（a）和脂肪酸酯（b）的组合量相对于磁铁粉末100重量份为5重量份以上。
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公开(公告)号：US4797321A
公开(公告)日：1989-01-10
申请号：US918973
申请日：1986-10-15
CPC分类号： G11B5/71 , G11B5/7085 , Y10S428/90 , Y10T428/256 , Y10T428/257 , Y10T428/259 , Y10T428/265
摘要： A magnetic recording disc having a high durability and good electromagnetic conversion characteristics which comprises a non-magnetic support and a magnetic layer provided on at least one surface of the support, wherein the magnetic layer comprises magnetic powder, a resinous binder, polishing particles and a lubricating agent, characterized in that the polishing particles have a Mohs' scale of hardness of not less than 7 and an average particle size of 0.25 r to 0.75 r (r being the thickness (.mu.m) of the magnetic layer) and the lubricating agent is a fatty acid ester having a melting point of not higher than 10.degree. C.
摘要翻译： 一种具有高耐久性和良好的电磁转换特性的磁记录盘，包括设置在载体的至少一个表面上的非磁性载体和磁性层，其中磁性层包括磁性粉末，树脂粘合剂，抛光颗粒和 润滑剂，其特征在于，研磨粒子的莫氏硬度为7以上，平均粒径为0.25〜0.75r（r为磁性层的厚度），润滑剂 是熔点不高于10℃的脂肪酸酯。
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