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US 9,721,606 B2Granted
Magnetic tape and method of manufacturing the same
AssigneeFUJIFILM Corporation
InventorNorihito Kasada
Life of this patent
Estimating the term…
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 magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; the backcoat layer has a thickness of less than or equal to 0.30 μm and contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a magnetic layer side C—H derived C concentration is greater than or equal to 45 atom %; and a backcoat layer side C—H derived C concentration is greater than or equal to 35 atom %.
Claims16
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 magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;
- the backcoat layer has a thickness of less than or equal to 0.30 μm and comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;
- a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape, referred to as a magnetic layer side C—H derived C concentration, is greater than or equal to 45 atom %;
- and
- a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the backcoat layer side of the magnetic tape, referred to as a backcoat layer side C—H derived C concentration, is greater than or equal to 35 atom %.
3 more elements
A method of manufacturing a magnetic tape,
- wherein the magnetic tape comprises a magnetic layer comprising ferromagnetic powder and binder on one surface of a nonmagnetic support, comprises a nonmagnetic layer comprising nonmagnetic powder and binder between the magnetic layer and the nonmagnetic support, and comprises a backcoat layer comprising nonmagnetic powder and binder on the other surface of the nonmagnetic support,
- wherein the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;
- the backcoat layer has a thickness of less than or equal to 0.30 μm and comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;
- a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape, referred to as a magnetic layer side C—H derived C concentration, is greater than or equal to 45 atom %;
- and
- a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the backcoat layer side of the magnetic tape, referred to as a backcoat layer side C—H derived C concentration, is greater than or equal to 35 atom %;
- and
- the method comprises formation of a nonmagnetic layer, formation of a magnetic layer, and formation of a backcoat layer;
- wherein
- the formation of a nonmagnetic layer further comprises:
- coating a nonmagnetic layer-forming composition comprising one or more components selected from the group consisting of a fatty acid and a fatty acid amide, nonmagnetic powder, binder, 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
- cooling the coating layer after the coating but prior to the heating and drying;
- and
- the formation of a backcoat layer further comprises:
- coating a backcoat layer-forming composition comprising one or more components selected from the group consisting of a fatty acid and a fatty acid amide, nonmagnetic powder, binder, 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
- cooling the coating layer after the coating but prior to the heating and drying.
17 more elements
Dependencies are inferred from the claim text.