Magnetic Tape Back Coating Layer for Running Stability
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Solution Overview
Problem
Magnetic tapes with thinned back coating layers experience deteriorated running stability in low temperature and high humidity environments, as simply adding lubricants is insufficient to prevent this deterioration.
Innovation Solution
A magnetic tape with a back coating layer thickness of 0.20 μm or less, incorporating non-magnetic powder and a binder, and containing fatty acid, fatty acid amide, or fatty acid ester, with specific surface C—H derived C concentrations and spacing distributions to enhance compatibility and sliding stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the back coating layer is thinned to increase recording capacity, then the recording capacity increases, but the running stability deteriorates in low temperature and high humidity environments
Solution Approach 1:
The invention applies local quality by creating a dual-structure back coating layer with different functional zones: a first back coating layer containing lubricant components for running stability, and a second back coating layer without lubricant for adhesion and protection. This local differentiation allows each zone to optimize its specific function while working together to resolve the contradiction between thinning and stability maintenance.
Solution Approach 2:
The invention uses composite materials by combining different material compositions in the back coating layer. The first back coating layer uses a binder with specific functional groups (carboxyl, hydroxyl, or amine groups) combined with lubricant components, creating a composite structure that provides both adhesion to the support and running stability. This composite approach allows the thinned structure to maintain reliability through material composition rather than thickness alone.
2Length of moving object
If the back coating layer is thinned to increase recording capacity, then the magnetic tape thickness decreases, but the compatibility with drive constituent elements deteriorates
Solution Approach 1:
The invention applies local quality by creating a dual-structure back coating layer with different functional zones: a first back coating layer containing lubricant components for running stability, and a second back coating layer without lubricant for adhesion and protection. This local differentiation allows each zone to optimize its specific function while working together to resolve the contradiction between thinning and stability maintenance.
Solution Approach 2:
The invention uses parameter changes by modifying the chemical composition parameters of the binder in the first back coating layer. The binder contains specific functional groups (carboxyl groups with 0.1-5.0 mmol/g, hydroxyl groups with 0.1-5.0 mmol/g, or amine groups with 0.1-5.0 mmol/g) that change the surface properties and chemical reactivity. This parameter optimization allows the thinned back coating layer to maintain compatibility with drive constituent elements through enhanced chemical interaction rather than thickness.
3Reliability
If lubricant is added to the back coating layer to improve running stability, then the running stability improves, but the back coating layer thickness must be increased
Solution Approach 1:
The invention applies local quality by creating a dual-structure back coating layer with different functional zones: a first back coating layer containing lubricant components for running stability, and a second back coating layer without lubricant for adhesion and protection. This local differentiation allows each zone to optimize its specific function while working together to resolve the contradiction between thinning and stability maintenance.
Solution Approach 2:
The invention uses composite materials by combining different material compositions in the back coating layer. The first back coating layer uses a binder with specific functional groups (carboxyl, hydroxyl, or amine groups) combined with lubricant components, creating a composite structure that provides both adhesion to the support and running stability. This composite approach allows the thinned structure to maintain reliability through material composition rather than thickness alone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The magnetic tape maintains excellent running stability in low temperature and high humidity environments by optimizing the surface composition and structure of the back coating layer, preventing stiffness loss and improving contact uniformity with drive components.
Implementation Method 1
the back coating layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide and fatty acid ester
Implementation Method 2
a C—H derived C concentration (hereinafter, also referred to as a 'surface part derived C concentration') calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis
Implementation Method 3
a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer
Data Source
AI summary
A magnetic tape in which a thickness of a back coating layer is equal to or smaller than 0.20 .mu.m. A C--H derived C concentration calculated from a C--H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %. The full widths at half maximum of spacing distribution measured by optical interferometry regarding the surface of the back coating layer before and after performing a vacuum heating with respect to the magnetic tape are respectively greater than 0 nm and equal to or smaller than 10.0 nm. The difference between the spacing measured after performing the vacuum heating and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 8.0 nm.