Fluorine Ether Lubricant Adhesion for Magnetic Recording

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Solution Overview

Problem

Magnetic recording media face challenges in achieving sufficient durability and preventing pick-up due to insufficient adhesion between the lubricating layer and the protective layer, especially when the lubricating layer thickness is reduced.

Innovation Solution

A fluorine-containing ether compound with a perfluoropolyether chain and organic end groups having two or more polar groups is used, which forms a lubricating layer with improved adhesion to the protective layer, reducing pick-up and maintaining durability even at reduced thicknesses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the thickness of the lubricating layer is reduced to enable further reduction of magnetic head floating height, then the floating height is reduced, but the adhesion between the lubricating layer and the protective layer becomes insufficient, causing pick-up to occur

Engineering Contradiction:

Improvefloating height of magnetic headVSAvoidadhesion between lubricating layer and protective layer

Core Design Contradiction:

Length of moving objectVSReliability

Solution Approach 1:

The invention changes the chemical composition parameters of the lubricant by introducing fluorine-containing ether compounds with specific molecular structures (Formula 1 or 2) that have enhanced adhesion properties. This allows the lubricating layer to maintain strong bonding to the protective layer even at reduced thickness, preventing pick-up while enabling lower magnetic head floating height

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses composite lubricant formulations containing fluorine-containing ether compounds combined with other lubricant components. This composite approach creates a lubricating layer with optimized properties that simultaneously provides strong adhesion to the protective layer and maintains low friction, resolving the contradiction between reduced thickness and sufficient adhesion

Inventive Principle:

Principle #40Composite materials

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 fluorine-containing ether compound ensures a lubricating layer with excellent adhesion to the protective layer, preventing pick-up and enhancing the durability of the magnetic recording medium, even when the layer thickness is minimized.

Implementation Method 1

the adhesion between the lubricating layer covering the surface of the protective layer and the protective layer is insufficient

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS10803898B2Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium

Publication Date: 2020.10.13 RESONAC CORP

AI summary

A fluorine-containing ether compound of the present invention is represented by Formula (1).R1—CH2—R2—CH2—R3 (1)(In Formula (1), R1 is an organic end group having 3 or more carbon atoms which includes two or more polar groups with each polar group being bonded to different carbon atoms and the carbon atoms to which the polar groups are bonded being bonded to each other via a linking group including the carbon atoms which are not bonded to the polar groups, R2 includes a perfluoropolyether chain represented by Formula (3), and R3 is a hydroxyl group or R1)—(CF2)y−1—O—((CF2)yO)z—(CF2)y−1— (3)(In Formula (3), y represents an integer of 2 to 4, and z represents an integer of 1 to 30).