Magnetic Recording Medium Polymer Composition for Low Running Friction
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Solution Overview
Problem
Magnetic recording media experience increased friction during repeated use, affecting running stability due to the interaction between the magnetic layer and the magnetic head.
Innovation Solution
Incorporation of specific polymers, such as polyorganosilsesquioxane and polyorganosiloxane, in the magnetic layer of the magnetic recording medium, which contain constitutional units designed to reduce friction and enhance adsorption to the ferromagnetic powder, thereby maintaining a low friction coefficient after repeated running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic recording media are used, then the magnetic layer can be formed on the non-magnetic support, but the friction coefficient increases after repeated running, affecting running stability
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer by specifying precise ratios of constitutional units (S-1)/(S-2) and (S-3)/(S-4) to optimize friction characteristics. This parameter optimization enables the polymer to maintain low friction coefficient over extended periods of repeated running.
Solution Approach 2:
The patent creates a composite polymer system combining polymer P (with units S-1 and S-2) and polymer Q (with units S-3 and S-4) in specific ratios. This composite material structure provides both low friction properties and durability, resolving the contradiction between initial performance and long-term stability.
2Force
If polymers are added to reduce friction, then the friction coefficient decreases, but the polymer structure becomes more complex
Solution Approach 1:
The patent applies local quality by concentrating specific functional units (S-1, S-2, S-3, S-4) with particular chemical properties at the interface between the magnetic layer and magnetic head. This localized functional distribution reduces friction without requiring complex polymer architectures throughout the entire material.
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 polymers contribute to a low friction coefficient, improving the running stability of the magnetic recording medium by reducing wear and maintaining performance over time.
Implementation Method 1
a magnetic recording medium including one or more polymers selected from the group consisting of a polymer P containing at least a constitutional unit represented by Formula (S-1) and a constitutional unit represented by Formula (S-2), and a polymer Q containing at least a constitutional unit represented by Formula (S-3) and a constitutional unit represented by Formula (S-4)
Data Source
AI summary
The magnetic recording medium contains one or more polymers selected from the group consisting of a polymer P and a polymer Q in a portion on the non-magnetic support on the magnetic layer side. R1 represents a monovalent aromatic group or a monovalent hydrocarbon group having 6 or more carbon atoms and L1 represents a single bond or a divalent group. R2 represents a monovalent polar group and L2 represents a single bond or a divalent group. R3 represents a monovalent aromatic group or a monovalent hydrocarbon group having 6 or more carbon atoms, L3 represents a single bond or a divalent group, and R11 represents an alkyl group. R4 represents a monovalent polar group, L4 represents a single bond or a divalent group and R12 represents an alkyl group.