Moresco Corporation

Matsumura Oil Research Corp.

Nagayoshi Kobayashi

Tsuyoshi Shimizu

Tamio Akada

Yoshinobu Fujii

Rie Fujimoto

Ryosuke Sagata

Tomomi Hatta

Kazunori Shirai

A lubricant containing a compound (A) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a polar group at each of opposite terminals thereof, and a compound (B) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a nonpolar group at at least one terminal thereof&#x2014;(CFCFCFO)-&#x2003;&#x2003;(1)wherein a is a real number of 5 to 30.

Lubricant and magnetic disk

A cyclophosphazene compound of the formula (I), and lubricants and magnetic disks using the compound wherein n is 2, 3 or 4, m is an integer of 1 to 12, R is Cfluoroalkyl and Rf is &#x2014;CFO(CFCFO)(CFO)CF&#x2014; or &#x2014;CFCFO(CFCFCFO)CFCF&#x2014; in which x, y and z are each 0 or a positive real number to give a number average molecular weight of 500 to 4000 to a fluoropolyether of the formula HOCH&#x2014;Rf&#x2014;CHOH including said Rf, the fluoropolyether having a molecular weight distribution (PD) of 1.0 to 1.5.

Cyclophosphazene compound, lubricant comprising same, and magnetic disk

A compound of the formula (1), lubricant containing the compound and magnetic diskR&#x2014;CHO&#x2014;CHCH(OH)CHOCH&#x2014;R&#x2014;CH&#x2014;O&#x2014;R&#x2003;&#x2003;(1)wherein Ris hydrogen, alkoxyl having 1 to 4 carbon atoms, amino or amido, Ris &#x2014;CFO(CFCFO)(CFO)CF&#x2014;, &#x2014;CFCFO(CFCFCFO)&#x2014;CFCF&#x2014; or &#x2014;CFCFCFO(CFCFCFCFO)CFCFCF&#x2014;, x and y are each an integer of 0 to 15, z is an integer of 1 to 15, n is an integer of 0 to 4, Ris &#x2014;CHCH(OH)CHOH, &#x2014;CHCH(OH)CHOCHCH(OH)CHOH or &#x2014;(CH)OH, m is an integer of 2 to 6.

Fluoropolyether compound, lubricant and magnetic disk each containing the same

A lubricant containing a compound (A) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a polar group at each of opposite terminals thereof, and a compound (B) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a nonpolar group at least one terminal thereof&#x2014;(CFCFCFO)-&#x2003;&#x2003;(1)wherein a is a real number of 5 to 30.

A lubricant containing a compound of the formula (I) wherein n is substantially 2, 3 or 4, R is Cfluoroalkyl and Rf is &#x2014;CFO(CFCFO)(CFO)CF&#x2014; or &#x2014;CFCFO(CFCFCFO)CFCF&#x2014; in which x, y and z are each 0 or a positive real number to give a number average molecular weight of 500 to 2000 to a fluoropolyether of the formula HOCH&#x2014;Rf&#x2014;CHOH including said Rf, the fluoropolyether having a molecular weight distribution (PD, weight average molecular weight/number average molecular weight) of 1.0 to 1.5.

A compound of the formula (1), lubricant containing the compound and magnetic diskCH&#x2014;(O&#x2014;Z&#x2014;R&#x2014;X)&#x2003;&#x2003;(1)wherein Z is &#x2014;CHCHO&#x2014; or &#x2014;CHCH(OH)CHO&#x2014;, R is &#x2014;CHCFCFCFO(CFCFCFCFO)CFCFCFCH&#x2014;, n is a real number of 0 to 20, X is &#x2014;OH, &#x2014;O(CH)OH, &#x2014;OCHCH(OH)CHOH, &#x2014;OCHCH(OH)CHO&#x2014;CHor &#x2014;OCHCH(OH)CHO&#x2014;CH&#x2014;OCH, m is an integer of 1 to 6.

A compound of the formula (I), and lubricant, and magnetic disk each using the sameA-(CH&#x2014;Rf&#x2014;CHO&#x2014;B&#x2014;O)&#x2014;CH&#x2014;Rf&#x2014;CH-A&#x2003;&#x2003;(I)wherein n is an integer of 1 to 4, A is a group of the formula (a) below, and B is a group of the formula (b) below, p being 1 or 2, R being Cfluoroalkyl, Rf is &#x2014;CFO(CFCFO)(CFO)CF&#x2014; or &#x2014;CFCFO(CFCFCFO)CFCF&#x2014;, x, y and z being each a real number of 0 to 50. 

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Kobe, Japan

Nagayoshi Kobayashi