Lubricants for magnetic recording media

Patent metadata

Field	Value
Publication number	US-9487724-B2
Application number	US-201314419712-A
Country	US
Kind code	B2
Filing date	Aug 7, 2013
Priority date	Aug 8, 2012
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

The invention relates to lubricants for magnetic recording media, and in particular, to such lubricants containing cyclotriphosphazene. Methods for preparing the lubricants are also disclosed.

First claim

The invention claimed is:

1. A compound of formula (I)

wherein
n is 1 to 6;
R f is selected from the group consisting of CF 2 CF 2 O(CF 2 CF 2 CF 2 O) m CF 2 CF 2 wherein m is 2 to 30 and CF 2 (OCF 2 CF 2 ) r O(CF 2 ) s wherein r is 2 to 30 and s is 0, 1, 2, or 3.

2. The compound of claim 1 , wherein n is 3.

3. The compound of claim 1 or 2 , wherein R f is CF 2 CF 2 O(CF 2 CF 2 CF 2 O) m CF 2 CF 2 , and wherein m is 21.

4. The compound of claim 1 or 2 , wherein R f is CF 2 (OCF 2 CF 2 ) r O(CF 2 ) s , and wherein r is 2 and s is 3.

5. A compound of formula (IDL1)

6. A method for forming the compound of formula (I)

wherein
n is 1 to 6;
R f is selected from the group consisting of CF 2 CF 2 O(CF 2 CF 2 CF 2 O) m CF 2 CF 2 wherein m is 2 to 30 and CF 2 (OCF 2 CF 2 ) r O(CF 2 ) s wherein r is 2 to 30 and s is 0, 1, 2, or 3, the method comprising:
reacting hexakis(pentafluorophenoxy)cyclotriphosphazene with a perfluoropolyether in a mixture of an organic solvent and a perfluorinated solvent in the presence of cesium carbonate at a temperature range of about 50 to 250° C.,
wherein the perfluoropolyether is a hydroxyl-terminated perfluoropolyether comprising HOCH 2 —R f —CF 3 ,
wherein R f is defined above.

7. The method of claim 6 , wherein the hydroxyl-terminated perfluoropolyether is HOCH 2 CF 2 (OCF 2 CF 2 ) 3 OCF 2 CF 2 CF 3 or HOCH 2 CF 2 (OCF 2 CF 2 ) 3 O(CF 2 ) 3 CF 3 .

8. The method of claim 7 , wherein the organic solvent is selected from the group consisting of tetrahydrofuran, benzene, and methylbenzene.

9. The method of claim 6 , wherein the hexakis(pentafluorophenoxy)cyclotriphosphazene is prepared by mixing hexachlorocyclotriphosphazene and a pentafluorophenoxide in a tetrahydrofuran solvent.

10. A method for lubricating a magnetic recording medium, comprising applying a lubricant comprising a compound of formula (I) to the magnetic recording medium,

wherein
n is 1 to 6;
R f is selected from the group consisting of CF 2 CF 2 O(CF 2 CF 2 CF 2 O) m CF 2 CF 2 wherein m is 2 to 30 and CF 2 (OCF 2 CF 2 ) r O(CF 2 ) s wherein r is 2 to 30 and s is 0, 1, 2, or 3.

Assignees

• Agency Science Tech & Res

Inventors

• Xu Jianwei
• Ji Rong
• Wang Xiaobai
• Tan Yan Xuan Angeline
• Cho Ching Mui
• He Chaobin
• Xie Huiqing
• Tsai Wen Huei Jack

Classifications

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2223/083

  used as base material · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2040/18

  in connection with recordings on magnetic tape or disc · CPC title

• C10M2225/0405

  used as base material · CPC title