公开(公告)号：US5418285A

公开(公告)日：1995-05-23

申请号：US88773

申请日：1993-07-08

申请人： Masahiko Ikka ,  Tomoki Horiguchi ,  Yoshiyuki Yasuhara

发明人： Masahiko Ikka ,  Tomoki Horiguchi ,  Yoshiyuki Yasuhara

IPC分类号： C08F8/32

CPC分类号： C08F8/32

摘要： Proposed is a novel vinyl chloride-based copolymeric resin suitable as an electron beam-curable binder resin for forming a magnetic recording layer of a magnetic recording medium. The binder resin is a vinyl chloride-based copolymeric resin containing monomeric units having a hydroxy group which is reacted with an ethylenically unsaturated monomeric compound having an isocyanato group in a molecule and then subjected to a modification reaction with an amine compound. The magnetic recording medium, e.g., magnetic recording tape, prepared by using the binder resin is excellent in the surface properties such as gloss and traveling resistance as well as in the magnetic properties such as residual magnetic flux density and squareness ratio of the magnetic hysteresis loop.

摘要翻译： 提出了一种适用于形成磁记录介质的磁记录层的电子束固化性粘合剂树脂的新型氯乙烯基共聚树脂。 粘合剂树脂是含有具有羟基的单体单元的氯乙烯系共聚树脂，其与分子中具有异氰酸酯基的烯属不饱和单体化合物反应，然后与胺化合物进行改性反应。 通过使用粘合剂树脂制备的磁记录介质例如磁记录带在光泽和行进阻力等表面性能以及磁滞回线的残留磁通密度和矩形比等磁特性方面是优异的 。

公开(公告)号：US4937151A

公开(公告)日：1990-06-26

申请号：US227823

申请日：1988-08-03

申请人： Yoshiyuki Yasuhara ,  Tateo Ishida

发明人： Yoshiyuki Yasuhara ,  Tateo Ishida

IPC分类号： C09D5/23 ,  C09D163/10 ,  G11B5/702

CPC分类号： G11B5/7022 ,  Y10S428/90

摘要： The invention provides a coating composition used for forming a magnetic layer on the surface of substrates to prepare magnetic recording media, e.g., recording tapes, of which the characteristic ingredient is a novel copolymeric resin. The copolymeric resin is a partial or complete saponification product of a copolymer obtained by the copolymerization of 4 types of comonomers in a spe-cified proportion including (1) vinyl chloride, (2) vinyl acetate, (3) a monomer having an ethylenically unsaturated polymerizable group and an epoxy group in the same molecule and (4) a monomer having an ethylenically unsaturated polymerizable group in the form of a sulfonic acid or a metal salt thereof. The vinyl acetate moiety is converted into a vinyl alcohol moiety partially or completely by the saponification. This copolymeric resin is advantageous in respect of the dispersibility of the ferromagnetic particles and the high crosslinkability which serves to improve the durability of the magnetic recording medium prepared by using the resin.

摘要翻译： 本发明提供一种用于在基板表面上形成磁性层的涂料组合物，以制备其特征成分为新型共聚树脂的磁记录介质，例如记录带。 共聚树脂是由（1）氯乙烯，（2）乙酸乙烯酯，（3）具有烯键式不饱和单体的单体共聚4种共聚单体获得的共聚物的部分或完全皂化产物 聚合性基团和环氧基团，（4）具有磺酸或其金属盐形式的烯键式不饱和可聚合基团的单体。 乙酸乙烯酯部分通过皂化部分或完全转化成乙烯醇部分。 该共聚树脂在铁磁颗粒的分散性和高交联性方面是有利的，其用于提高通过使用树脂制备的磁记录介质的耐久性。