Fluoropolyether compound and lubricant
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.
1. A fluoropolyether compound having the formula (1):
A-OH 2 C— p (F 2 C)—O—R 1 —(CF 2 ) p —CH 2 O—CH 2 CH(OH)CH 2 —OCH 2 —(CF 2 ) p —R 1 —O—(CF 2 ) p —CH 2 O—B (1)
where:
R 1 is —(CF 2 O) x (CF 2 CF 2 O) y (CF 2 CF 2 CF 2 O) z (CF 2 CF 2 CF 2 CF 2 O) 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 C 1-10 alkyl group, or an alkoxy group; and
n is 1 or 2.
2. The compound of claim 1 wherein A and B are the same.
3. The compound of claim 1 wherein A and B are different.
4. The compound of claim 1 wherein R is an alkoxy group and n=1.
5. 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 .
6. The magnetic media of claim 5 , wherein the lubricant comprises more than one compound of claim 1 .
7. The magnetic media of claim 5 , further comprising a protective layer on the recording layer, and the lubricant on the protective layer.
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-OH 2 C— p (F 2 C)—O—R 1 —(CF 2 ) p —CH 2 O—CH 2 CH(OH)CH 2 —OCH 2 —(CF 2 ) p —R 1 —O—(CF 2 ) p —CH 2 O—B (1)
where:
R 1 is —(CF 2 O) x (CF 2 CF 2 O) y (CF 2 CF 2 CF 2 O) z (CF 2 CF 2 CF 2 CF 2 O) 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 C 1-10 alkyl group, or an alkoxy group; and
n is 1 or 2.
9. The apparatus of claim 8 wherein A and B are the same.
10. The apparatus of claim 8 wherein A and B are different.
11. The apparatus of claim 8 wherein R is an alkoxy group and n=1.
12. The apparatus of claim 8 wherein R is a methoxy.
13. The compound of claim 1 wherein R is a methoxy.