发明名称 |
Beschichtungszusammensetzungen für eine transparente magnetische Aufzeichnungsschicht |
摘要 |
A coating compsn. for applying a transparent magnetic recording layer to a support is claimed. It comprises a polymeric binder, ferromagnetic particles and a dispersing medium for the polymeric binder. The dispersing medium comprises: (a) a cpd. of formula R"C(O)-C(R')H-C(O)-OR (I), where R = 1-8C alkyl, phenyl or benzyl, R' = H or (m)ethyl, and R" = 1-5C alkyl; and (b) methylene chloride and/or lower alkyl ketones. The lower alkyl ketone is acetone. The cpd. of formula (I) is present in amt. 0.5-10 (2-8,4-6) wt.%, based on the total wt. of the dispersing medium. Methylene chloride is present in amt. 5-95 (15-80) wt.%, the lower alkyl ketone is present in amt. 2-90 (15-80) wt.% and the cpd. of formula (I) is present in amt. 0.5-10 (2-8)wt.%. Abrasive particles having an av. dia. of 0.04-0.4 ~mm and a Mohs hardness of at least 6 are present in the coating compsn.. An effective amt. of a surfactant to prevent agglomeration of the magnetic particles is included in the coating compsn. (I) is methyl acetoacetate. The polymeric binder is a cellulose ester (pref. cellulose diacetate), a polyurethane or a vinyl polymer. The compsn. includes a crosslinking agent which is aziridine, melamine or pref. an isocyanate. |
申请公布号 |
DE69408651(D1) |
申请公布日期 |
1998.04.02 |
申请号 |
DE1994608651 |
申请日期 |
1994.12.19 |
申请人 |
EASTMAN KODAK CO., ROCHESTER, N.Y., US |
发明人 |
WEXLER, RONALD MYRON, C/O EASTMAN KODAK COMPANY, ROCHESTER, NEW YORK 14650-2201, US |
分类号 |
G03C1/00;C08J3/09;C09D5/00;C09D5/23;C09D201/00;G03C1/76;G11B5/633;G11B5/708;(IPC1-7):G11B5/702 |
主分类号 |
G03C1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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