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

1. A fluorine-containing ether compound represented by Formula (1):

R 1 —R 2 —CH 2 —R 3 —CH 2 —R 4 —R 5   (1)

(in Formula (1), R 1 and R 5 may be the same as or different from each other and each represents an alkenyl group having 2 to 8 carbon atoms or an alkynyl group having 3 to 8 carbon atoms, R 2 and R 4 may be the same as or different from each other and each represents a divalent linking group having a polar group, and R 3 represents a perfluoropolyether chain, with a proviso that R 1 and R 2 are, and R 4 and R 5 are divided due to the presence of an atom other than the carbon atom such as an oxygen atom.).

2. The fluorine-containing ether compound according to claim 1 ,

wherein R 1 and R 5 each represents an alkenyl group having 2 to 5 carbon atoms or an alkynyl group having 3 to 5 carbon atoms.

3. The fluorine-containing ether compound according to claim 2 ,

wherein R 1 and R 5 each represents one selected from the group consisting of a vinyl group, an allyl group, a 3-butenyl group, a 4-pentenyl group, a propargyl group, a 3-butynyl group, and a 4-pentynyl group.

4. The fluorine-containing ether compound according to claim 1 ,

wherein the polar group included in R 2 and R 4 is a hydroxy group.

5. The fluorine-containing ether compound according to claim 1 ,

wherein R 2 and R 4 are represented by Formula (2-1) or (2-2)

—O—(CH 2 CH(OH)CH 2 O) a —  (2-1)

(in Formula (2-1), a represents 1 to 3)

—O—(CH 2 CH(OH)CH 2 O) a —CH 2 CH 2 O—  (2-2)

(in Formula (2-2), a represents 1 to 3).

6. The fluorine-containing ether compound according to claim 1 ,

wherein R 3 is represented by any one of Formulas (3) to (5)

—CF 2 —(OCF 2 CF 2 ) b —(OCF 2 ) c —OCF 2 —  (3)

(in Formula (3), b and c each represents 0 to 20, but b and c are not 0 simultaneously)

—CF(CF 3 )—(OCF(CF 3 )CF 2 ) d —OCF(CF 3 )—  (4)

(in Formula (4), d represents 1 to 20)

—CF 2 CF 2 —(OCF 2 CF 2 CF 2 ) e —OCF 2 CF 2 —  (5)

(in Formula (5), e represents 1 to 20).

7. The fluorine-containing ether compound according to claim 1 ,

wherein a number average molecular weight thereof is within a range of 500 to 10000.

8. The fluorine-containing ether compound according to claim 1 ,

wherein the fluorine-containing ether compound is any one of compounds represented by Formulas (A) to (0)

(in Formula (A), f and g each represents 0 to 7, and f and g are not 0 simultaneously)

(in Formula (B), h and i each represents 0 to 7, and h and i are not 0 simultaneously)

(in Formula (C), j and k each represents 0 to 7, and j and k are not 0 simultaneously)

(in Formula (D), m and n each represents 0 to 7, and m and n are not 0 simultaneously)

(in Formula (E), p and q each represents 0 to 7, and p and q are not 0 simultaneously)

(in Formula (F), r and s each represents 0 to 7, and r and s are not 0 simultaneously)

(in Formula (G), t and u each represents 0 to 7, and t and u are not 0 simultaneously)

(in Formula (H), v and w each represents 0 to 7, and v and w are not 0 simultaneously)

(in Formula (I), x and y each represents 0 to 7, and x and y are not 0 simultaneously)

(in Formula (J), z and aa each represents 0 to 7, and z and aa are not 0 simultaneously)

(in Formula (K), ab and ac each represents 0 to 7, and ab and ac are not 0 simultaneously)

(in Formula (L), ad and ae each represents 0 to 7, and ad and ae are not 0 simultaneously)

(in Formula (M), af and ag each represents 0 to 7, and af and ag are not 0 simultaneously)

(in Formula (N), ah and ai each represents 0 to 7, and ah and ai are not 0 simultaneously)

(in Formula (0), aj represents 1 to 7).