MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A magnetic tape,which comprises a magnetic layer comprising ferromagnetic powder and binder on a surface on one side of a nonmagnetic support and comprises a backcoat layer comprising nonmagnetic powder and binder on a surface on the other side of the nonmagnetic support, wherein:
- the backcoat layer is less than or equal to 0.30 μ
m in thickness; and
a logarithmic decrement as determined by a pendulum viscoelasticity test on a surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.
1 Assignment
0 Petitions
Accused Products
Abstract
The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side of the nonmagnetic support, wherein the backcoat layer is less than or equal to 0.30 μm in thickness; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.
100 Citations
19 Claims
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1. A magnetic tape,
which comprises a magnetic layer comprising ferromagnetic powder and binder on a surface on one side of a nonmagnetic support and comprises a backcoat layer comprising nonmagnetic powder and binder on a surface on the other side of the nonmagnetic support, wherein: -
the backcoat layer is less than or equal to 0.30 μ
m in thickness; anda logarithmic decrement as determined by a pendulum viscoelasticity test on a surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of manufacturing a magnetic tape,
wherein the magnetic tape is a magnetic tape which comprises a magnetic layer comprising ferromagnetic powder and binder on a surface on one side of a nonmagnetic support and comprises a backcoat layer comprising nonmagnetic powder and binder on a surface on the other side of the nonmagnetic support, wherein: -
the backcoat layer is less than or equal to 0.30 m in thickness; and a logarithmic decrement as determined by a pendulum viscoelasticity test on a surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060, and the method comprises forming a backcoat layer, with the forming of a backcoat layer comprising; coating a backcoat layer-forming composition comprising nonmagnetic powder, binder, a curing agent, and solvent on a surface of a nonmagnetic support to form a coating layer, heating and drying the coating layer by a heat treatment; and curing the coating layer by subjecting the coating layer to a curing treatment; with cooling the coating layer after the coating but before the heating and drying; and burnishing a surface of the coating layer after the heating and drying but before the curing. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification