专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US07090936B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07090936B2
公开(公告)日：2006-08-15
申请号：US10397845
申请日：2003-03-27
申请人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
发明人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： G11B5/738
CPC分类号： G11B5/738 , G11B5/7026
摘要： The present invention provides a high recording density magnetic recording medium with excellent surface smoothness, as well as excellent electromagnetic conversion characteristics and durability. A magnetic recording medium comprising a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on a non-magnetic support, and an upper magnetic layer with a thickness of 0.2 μm or less on said lower non-magnetic layer, wherein said lower non-magnetic layer contains an acicular powder of hydrated iron oxide as the non-magnetic powder, and said lower non-magnetic layer contains a fatty acid and a fatty acid amide. Preferably the acicular powder of hydrated iron oxide is goethite with an average long axial length of 0.15 μm or less.
摘要翻译：本发明提供了具有优异的表面光滑度以及优异的电磁转换特性和耐久性的高记录密度磁记录介质。一种磁记录介质，包括在非磁性载体上至少包含非磁性粉末和粘合剂树脂的下部非磁性层，以及在所述下部非磁性层上具有0.2μm或更小的厚度的上部磁性层其中所述下部非磁性层含有作为非磁性粉末的水合氧化铁的针状粉末，所述下部非磁性层含有脂肪酸和脂肪酸酰胺。优选地，水合氧化铁的针状粉末是具有0.15μm或更小的平均长轴向长度的针铁矿。

2. 发明授权

US06777061B2 Magnetic recording medium and process for producing the same 有权
公开(公告)号：US06777061B2
公开(公告)日：2004-08-17
申请号：US10397846
申请日：2003-03-27
申请人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
发明人： Kenichi Kitamura , Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： G11B5714
CPC分类号： G11B5/738 , G11B5/714 , G11B5/84 , Y10T428/1164 , Y10T428/1179 , Y10T428/25 , Y10T428/257 , Y10T428/265
摘要： The present invention provides a high recording density magnetic recording medium with improved dropout and excellent surface smoothness and electromagnetic conversion characteristics, as well as a process for producing such a medium. A magnetic recording medium comprising a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on one surface of a non-magnetic support, an upper magnetic layer containing at least a ferromagnetic powder and a binder resin on said lower non-magnetic layer, and a back coat layer on an opposite surface of said non-magnetic support, wherein said lower non-magnetic layer contains an acicular powder of hydrated iron oxide as the non-magnetic powder, said ferromagnetic powder has an average long axial length of 0.1 &mgr;m or less, and said upper magnetic layer has a surface roughness (center line average roughness: Ra) of 2.4 nm or less. After curing the lower non-magnetic layer, the magnetic layer is applied and formed.

3. 发明授权

US07601395B2 Magnetic recording medium and method for manufacturing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US07601395B2
公开(公告)日：2009-10-13
申请号：US11032080
申请日：2005-01-11
申请人： Takayoshi Kuwajima , Sadafumi Iijima
发明人： Takayoshi Kuwajima , Sadafumi Iijima
IPC分类号： B05D3/02
CPC分类号： G11B5/7022 , G11B5/7013
摘要： A high recording density magnetic recording medium and a manufacturing method therefor are provided. The dilution stability during preparation of magnetic paint is improved and, thereby, even when the magnetic paint concentration is lowered, no problem occurs with the surface roughness and the output of the thin magnetic layer. The magnetic recording medium includes at least a magnetic layer on one surface of a non-magnetic support, wherein the magnetic layer contains a magnetic powder, a vinyl chloride resin having a degree of polymerization of at least 270 and an aliphatic polyester polyurethane resin to serve as binder resins, an aromatic compound having a substituent R (where R is —COOH, —(COOH)2, —OPO(OH)2, —PO(OH)2, or —SO3H), and a phosphoric acid ester. The ratio of binder resins in the magnetic paint is set at 2.0 percent by weight or less relative to a total sum of the binder resins and a solvent.
摘要翻译：提供了一种高记录密度磁记录介质及其制造方法。磁性涂料制备过程中的稀释稳定性提高，即使磁性涂料浓度降低，也不会发生薄磁性层的表面粗糙度和输出问题。磁记录介质至少包括在非磁性载体的一个表面上的磁性层，其中磁性层含有磁性粉末，聚合度至少为270的氯乙烯树脂和用于服务的脂族聚酯聚氨酯树脂作为粘合剂树脂，具有取代基R（其中R是-COOH， - （COOH）2，-OPO（OH）2，-PO（OH）2或-SO 3 H）的芳族化合物和磷酸酯。磁性涂料中的粘合剂树脂的比例相对于粘合剂树脂和溶剂的总和设定为2.0重量％以下。

4. 发明申请

US20060210839A1 Magnetic recording medium 审中-公开
标题翻译：磁记录介质
公开(公告)号：US20060210839A1
公开(公告)日：2006-09-21
申请号：US11374061
申请日：2006-03-14
申请人： Tsutomu Ide , Katsuhiko Yamazaki , Tomoyuki Kotaki , Sadafumi Iijima
发明人： Tsutomu Ide , Katsuhiko Yamazaki , Tomoyuki Kotaki , Sadafumi Iijima
IPC分类号： G11B5/716
CPC分类号： G11B5/7013 , G11B5/73
摘要： A magnetic recording medium which makes it possible to further increase the recording capacity while maintaining a required flexibility thereof. A magnetic tape has a lower non-magnetic layer and a magnetic layer formed on one surface of a base film in the mentioned order. The lower non-magnetic layer is formed of a non-magnetic coating material containing a non-magnetic powder, an electron beam curing binder, a dispersant having an amine group, and a thermosetting agent.
摘要翻译：一种磁记录介质，其可以进一步提高记录容量，同时保持其所需的柔性。磁带具有较低的非磁性层和以所述顺序形成在基膜的一个表面上的磁性层。下部非磁性层由含有非磁性粉末，电子束固化粘合剂，具有胺基的分散剂和热固化剂的非磁性涂料形成。

5. 发明授权

US5510179A Magnetic recording medium having at least two layers wherein the uppermost layer contains alumina particles which contain specified oxides 失效
标题翻译：具有至少两层的磁记录介质，其中最上层含有含有特定氧化物的氧化铝颗粒
公开(公告)号：US5510179A
公开(公告)日：1996-04-23
申请号：US361578
申请日：1994-12-22
申请人： Kiyoto Fukushima , Sadafumi Iijima , Motoyuki Tsunoda
发明人： Kiyoto Fukushima , Sadafumi Iijima , Motoyuki Tsunoda
IPC分类号： C09D5/23 , G11B5/41 , G11B5/70 , G11B5/708 , G11B5/716 , G11B5/738 , G11B5/842 , G11B5/00
CPC分类号： G11B5/842 , G11B5/41 , G11B5/70 , G11B5/708 , Y10S428/90 , Y10T428/25 , Y10T428/256 , Y10T428/26 , Y10T428/265 , Y10T428/2982
摘要： A magnetic recording medium has at least two coating layers on a non-magnetic substrate. The uppermost layer of the coating layers is a magnetic layer having a thickness of 0.2-0.5 .mu.m thick and comprising a ferromagnetic powder, inorganic material-containing alumina particles having a mean particle size of 0.1-0.3 .mu.m, and a binder. The medium ensures effective head cleaning and has improved durability and still life.
摘要翻译：磁记录介质在非磁性基底上具有至少两个涂层。涂层的最上层是厚度为0.2-0.5μm的磁性层，其中含有铁磁性粉末，平均粒径为0.1-0.3μm的含无机材料的氧化铝颗粒和粘合剂。该介质确保有效的头部清洁，并提高耐用性和静物。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式