# US 11,308,985 B2 · Fluoropolyether compound and lubricant

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- Number: US 11,308,985 B2
- Document ID: US11308985B2
- Status: Granted
- Kind: B2
- Application number: 16/260,692
- Filed: 2019-01-29
- Published: 2019-08-01
- Granted: 2022-04-19
- Earliest claimed: 2018-01-29
- Assignees: Seagate Technology LLC
- Applicants: Seagate Technology LLC
- Inventors: Yu Lu; JiPing Yang; Jingyuan Zhuo; Qian Guo; Wen Liu
- Web page: https://patentgrep.com/patent/US11308985B2

## CPC

- G11B 5/7257: {Perfluoropolyether lubricant}
- C08G 65/2639: {the other compounds containing elements other than oxygen, nitrogen or sulfur}
- C08L 71/02: Polyalkylene oxides
- C10M 107/32: Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
- C10M 107/38: containing halogen
- G11B 5/725: containing a lubricant {, e.g. organic compounds (inorganic carbon protective coating G11B5/727)}
- C08L 2203/20: use in electrical or conductive gadgets
- C10M 2213/04: obtained from monomers containing carbon, hydrogen, halogen and oxygen
- C10M 2213/06: Perfluoro polymers
- C10M 2213/0606: used as base material
- C10N 2040/18: in connection with recordings on magnetic tape or disc
- C10N 2050/023: {Multi-layer lubricant coatings}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

Fluoropolyether compounds that can be used as a lubricant, such as for magnetic recording media. The compounds have a terminal group that includes a phenol or benzene. The fluoropolyether compounds reduce the head to media distance while keeping comparable reliability in a hard disk drive compared to current industrial widely used fluoropolyether based lubricants.

## Claims

### Claim 1

A fluoropolyether compound having the formula (1):
A-OH2C—p(F2C)—O—R1—(CF2)p—CH2O—CH2CH(OH)CH2—OCH2—(CF2)p—R1—O—(CF2)p—CH2O—B (1)
where:
R1 is —(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w—, with x=4, y=0 and w=0;
p is any integer within the range of 0 to 4; and
A and B are independently represented by formula (2):
where:
R is a C1-10 alkyl group, or an alkoxy group; and
n is 1 or 2.

### Claim 2 (depends on 1)

The compound of claim 1 wherein A and B are the same.

### Claim 3 (depends on 1)

The compound of claim 1 wherein A and B are different.

### Claim 4 (depends on 1)

The compound of claim 1 wherein R is an alkoxy group and n=1.

### Claim 5 (depends on 1)

A magnetic media comprising:
a substrate with a recording layer thereon, and a lubricant on the recording layer, the lubricant comprising a compound of claim 1.

### Claim 6 (depends on 1, 5)

The magnetic media of claim 5, wherein the lubricant comprises more than one compound of claim 1.

### Claim 7 (depends on 5)

The magnetic media of claim 5, further comprising a protective layer on the recording layer, and the lubricant on the protective layer.

### Claim 8

An apparatus comprising:
a substrate;
a magnetic layer on the substrate for magnetic recording
a protective overcoat layer protecting the magnetic layer; and
a lubricant layer over the protective overcoat layer, the lubricant comprising a compound of formula (1):
A-OH2C—p(F2C)—O—R1—(CF2)p—CH2O—CH2CH(OH)CH2—OCH2—(CF2)p—R1—O—(CF2)p—CH2O—B (1)
where:
R1 is —(CF2O)x(CF2CF2O)y(CF2CF2CF2O)z(CF2CF2CF2CF2O)w—, with x=4, y=0 and w=0;
p is any integer within the range of 0 to 4; and
A and B are independently represented by formula (2):
where:
R is a C1-10 alkyl group, or an alkoxy group; and
n is 1 or 2.

### Claim 9 (depends on 8)

The apparatus of claim 8 wherein A and B are the same.

### Claim 10 (depends on 8)

The apparatus of claim 8 wherein A and B are different.

### Claim 11 (depends on 8)

The apparatus of claim 8 wherein R is an alkoxy group and n=1.

### Claim 12 (depends on 8)

The apparatus of claim 8 wherein R is a methoxy.

### Claim 13 (depends on 1)

The compound of claim 1 wherein R is a methoxy.