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US 10,896,692 B2Granted
Magnetic tape
AssigneeFUJIFILM Corporation
InventorsTakuto Kurokawa, Norihito Kasada, Masahito Oyanagi
Life of this patent
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Abstract
The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, and the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°.
Claims10
A magnetic tape,
- which comprises a magnetic layer comprising ferromagnetic powder and binder on one surface of a nonmagnetic support and comprises a backcoat layer comprising nonmagnetic powder and binder on the other surface of the nonmagnetic support, wherein:
- the backcoat layer comprises a nitrogen-containing polymer which is a polyalkyleneimine polymer containing a polyalkyleneimine chain and a polyester chain;
- the thickness of the backcoat layer is less than or equal to 0.20 μm;
- and
- the contact angle for 1-bromonaphthalene that is measured on a surface of the backcoat layer falls within a range of 10.0° to 30.0°.
2 more elements
Dependencies are inferred from the claim text.