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。

公开(公告)号：US5021292A

公开(公告)日：1991-06-04

申请号：US281054

申请日：1988-12-08

申请人： Kyoiti Imai ,  Tateo Ishida

发明人： Kyoiti Imai ,  Tateo Ishida

IPC分类号： C08F28/00 ,  C08F214/06 ,  C08F228/00 ,  C09D5/00 ,  C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  G11B5/702 ,  G11B5/706

CPC分类号： G11B5/7023 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/257

摘要： The magnetic coating composition of the invention comprises ferromagnetic particles having a specific surface area of at least 35 m.sup.2 /g dispersed in a resinous vehicle which is a polyvinyl chloride-based copolymeric resin composed of five types of monomeric moieties including (a) a moiety of vinyl chloride, (b) a moiety of vinyl alcohol, (c) a moiety of a vinyl carboxylate having from 6 to 20 carbon atoms in a unit, (d) a moiety of a vinyl or allyl monomer having a sul-fonic acid group or a sulfonic acid group in the form of a metal salt in the molecule, and (e) a moiety of a vinyl or allyl monomer having an epoxy group in the molecule. This vehicle resin is advantageous in respect of the dispersibility of the ferromagnetic particles to greatly facilitate the coating operation due to the relatively low viscosity of the coating composition as compared with conventional resins.

摘要翻译： 本发明的磁性涂料组合物包含分散在树脂载体中的比表面积至少为35m 2 / g的铁磁性颗粒，其是由五种类型的单体部分组成的聚氯乙烯基共聚树脂，其包括（a） 氯乙烯，（b）乙烯醇部分，（c）单元中具有6至20个碳原子的乙烯基羧酸酯的部分，（d）具有磺酸基团的乙烯基或烯丙基单体的部分 或分子内呈金属盐形式的磺酸基，和（e）分子中具有环氧基的乙烯基或烯丙基单体的部分。 与常规树脂相比，由于涂料组合物的粘度相对较低，该车辆树脂在铁磁性颗粒的分散性方面是有利的，从而极大地促进了涂布操作。