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    • 7. 发明公开
    • Binder for coating materials containing dispersed inorganic powder, coating material containing dispersed inorganic powder, and magnetic recording medium
    • 含有分散的无机粉末粘结剂涂层产品分散的无机含有粉末的涂布剂,以及磁记录介质。
    • EP0673956A1
    • 1995-09-27
    • EP95103368.7
    • 1995-03-09
    • NIPPON ZEON CO., LTD.
    • Yamakawa, MasahiroAkimoto, KenjiNakamura, KatsuyaTakano, FumioTakasaki, Takahiro
    • C08G18/10C08G18/28C08G18/86C08G18/08G11B5/702C09D175/04
    • G11B5/7022C08G18/0804C08G18/10C08G18/86G11B5/7021Y10S428/90Y10T428/31609Y10T428/31935Y10T428/31938C08G18/2845
    • A binder for coating materials containing dispersed inorganic powder comprises a polyurethane resin containing (a) 2.2 to 7.0 terminal epoxy groups in one molecule in average and (b) 0.1 to 5.0 % by weight as SO₃⁻ of a sulfonic acid salt group, 0.05 to 3.0 % by weight as COO⁻ of a carboxylic acid salt group, or 0.02 to 1.0 % by weight as N⁺ of a quaternary ammonium salt group in the molecule, and having a number-average molecular weight of 2,000 to 10,000. A coating material containing dispersed inorganic powder and a magnetic recording medium both use this binder. In a recording medium comprising a magnetic layer placed on a non-magnetic substrate, the magnetic layer comprises polyurethane resin (A) as a binder, vinyl chloride polymer (B) containing 0.1 to 20 % by weight of epoxy group and having an average degree of polymerization of 100 to 500, as another binder, (C) an alicylic acid anhydride as a crosslinking agent, and (E) a tertiary amine as a catalyst, and at least one of the binders is crosslinked between the epoxy groups therein by the reaction in which components (C) and (E) take part. The coating material containing fine inorganic powder dispersed with stability and having a low viscosity can be obtained by using, as the binder, the polyurethane resin having terminal epoxy groups and one of a sulfonic acid salt group, a carboxylic acid salt group, and a quaternary ammonium salt group. The magnetic recording material prepared by using magnetic powder as the inorganic powder and crosslinking the binder is excellent in dispersion of the magnetic powder and smoothness of the surface. Therefore, the magnetic recording medium is excellent in magnetic properties, durability, and running properties.
    • 一种用于含有分散无机粉末涂料粘合剂(重量)在平均一个分子和(b)0.1〜5.0%包括含有(A)2.2至7.0的末端环氧基团的聚氨酯树脂作为SO3 < - >磺酸盐基团, 12:05至3.0%(重量)作为COO < - >羧酸盐基团,或者0时02%至1.0%(重量)如N <+>在分子中具有季铵盐基团的,并且具有2000的数均分子量 10000。 含有分散的无机粉末和磁性记录介质的涂料材料两者都使用这种粘结剂。 在包括设置在非磁性基体的磁性层的记录介质,该磁性层包含聚氨酯树脂(A)作为粘结剂,氯乙烯聚合物(B)按重量计的环氧基的含有0.1〜20%,具有平均度 的100至500的聚合,作为另一粘合剂的,(C),以脂环族酸酐作为交联剂,和(e)的叔胺作为催化剂,和粘合剂中的至少一个是环氧基团之间的交联。其中由 这反应在组分(C)和(e)参加。 含有分散稳定细无机粉末和具有低粘度的涂料可通过使用获得,作为粘合剂,具有末端环氧基团和一个磺酸盐基团,羧酸盐基团中的一个的聚氨酯树脂,和季 铵盐基团。 通过使用磁性粉末作为无机粉末和交联粘合剂制备的磁性记录材料具有优异的表面的磁性粉末和光滑的分散液。 因此,磁性记录介质具有优异的磁特性,耐久性和运行性能。