Magnetic storage medium with lubricating coating

Claim 2

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprises a perfluoroalkyl compound represented by the general formula (1): R.sub.f --J'--CF.sub.2 --J--.sub.n --R.sub.f ( 1) wherein R f represents C m F 2m+1 (m is a positive integer), n is a positive integer not smaller than 5, J and J' each represent ##STR48##

Claim 3

A magnetic storage medium according to claim 1, wherein said lubricant layer is laid directly on the surface of said ferromagnetic material layer.

Claim 4

A magnetic storage medium according to claim 1, further comprising a protective film coated directly on the surface of said ferromagnetic material layer, said lubricant layer is laid directly on the surface of said protective film.

Claim 5

A magnetic storage medium according to claim 1, wherein said base is a disk.

Claim 6

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formula (2A), (2B) and (2C): G--R.sub.f '--J'--CF.sub.2 --J--.sub.n --R.sub.f ( 2A) R.sub.f --J'--CF.sub.2 --J--.sub.n --R.sub.f '--G (2B) G--R.sub.f '--J'--CF.sub.2 --J--.sub.n --R.sub.f '--G' (2C) wherein R f represents C m F 2m+1 (m is a positive integer), R f ' represents C m F 2m (m is a positive integer), n is a positive integer not smaller than 10, J and J' each represent ##STR49## wherein J is not --S--, G and G' each represent a functional group selected from the group consisting of --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR50## --CONH, --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (i is 0 or a positive integer), --NH 2 , --CH═CH 2 , --Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 and 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represent a radial consisting of at least one element selected from C, H, N, O and S).

Claim 7

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formula (2A), (2B) and (2C): G--R.sub.f '--J'--CF.sub.2 --J--.sub.n --R.sub.f ( 2A) R.sub.f --J'--CF.sub.2 --J--.sub.n --R.sub.f '--G (2B) G--R.sub.f '--J'--CF.sub.2 --J--.sub.n --R.sub.f '--G' (2C) wherein R f represents C m F 2m+1 (m is a positive integer), R f ' represents C m F 2m (m is a positive integer), n is a positive integer not smaller than 10, J and J' each represent ##STR49## wherein J is not --S--, G and G' each represent a functional group selected from the group consisting of --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR50## --CONH, --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (i is 0 or a positive integer), --NH 2 , --CH═CH 2 , --Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 and 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represent a radial consisting of at least one element selected from C, H, N, O and S).

Claim 8

A magnetic storage medium according to claim 5, wherein said lubricant layer is laid directly on the surface of said ferromagnetic material layer.

Claim 9

A magnetic storage medium according to claim 5, further comprising a protective film coated directly on the surface of said ferromagnetic material layer, said lubricant layer is laid directly on the surface of said protective film.

Claim 10

A magnetic storage medium according to claim 5, wherein said radial represented by A is selected from the group consisting of --CO--NH--CH 2 --CH 2 --, --NH--CH 2 --CH(OH)--CH 2 --CH 2 --, --NH--CO--CH 2 --, --O--CH 2 --CH--, --S--CH 2 --CH 2 --, ##STR51##

Claim 11

A magnetic storage medium according to claim 5, wherein said base is a disk.

Claim 12

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (3A), (3B), and (3C): ##STR52## wherein R f and R f * each represent C m F 2m+1 (m is a positive integer), R f ' represents a radical consisting of carbon and fluorine atoms, R f " represents --C m F 2m-- (m is a positive integer), X represent H, F, Cl or Br, J, J', J" and J'* each represents one of ##STR53## or a combination of two or more thereof, G, G' and G'* each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR54## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (is is a positive integer), --NH 2 , --CH 2 =CH 2 , --Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --CO f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represents a radical consisting of at least one element selected from C, H, N, O and S), p is a positive integer, q is 0 or a positive integer, r is 0 or 1, k is 0 or a positive integer, s is a positive integer.

Claim 13

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (3A), (3B), and (3C): ##STR52## wherein R f and R f * each represent C m F 2m+1 (m is a positive integer), R f ' represents a radical consisting of carbon and fluorine atoms, R f " represents --C m F 2m-- (m is a positive integer), X represent H, F, Cl or Br, J, J', J" and J'* each represents one of ##STR53## or a combination of two or more thereof, G, G' and G'* each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR54## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (is is a positive integer), --NH 2 , --CH 2 =CH 2 , --Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --CO f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represents a radical consisting of at least one element selected from C, H, N, O and S), p is a positive integer, q is 0 or a positive integer, r is 0 or 1, k is 0 or a positive integer, s is a positive integer.

Claim 14

A magnetic storage medium according to claim 10, wherein said lubricant layer is laid directly on the surface of said ferromagnetic material layer.

Claim 15

A magnetic storage medium according to claim 10, further comprising a protective film coated directly on the surface of said ferromagnetic material layer, said lubricant layer is laid directly on the surface of said protective film.

Claim 16

A magnetic storage medium according to claim 10, wherein said radical represented by A is selected from the group consisting of --CO--NH--CH 2 --CH 2 --, --NH--CH 2 --CH(OH)--CH 12 --CH 2 --, --NH--CO--CH 2 --, --O--CH 2 --CH 2 --, --S--CH 2 --CH 2 --, ##STR55##

Claim 17

A magnetic storage medium according to claim 10, wherein R f ' represents ##STR56##

Claim 18

A magnetic storage medium according to claim 10, wherein R f " represents ##STR57##

Claim 19

A magnetic storage medium according to claim 10, wherein said base is a disk.

Claim 20

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (4A) and (4B): ##STR58## wherein R f and R f * each represent C m F 2m+1 (m is a positive integer), R f ' and R f " each represent a radical consisting of carbon and fluorine atoms, J and J' each represent one of --S--, ##STR59## --NH--, --NH--CO--, --NHCO--NH-- and --NHCOO-- or a combination of two or more thereof wherein J is not --S--, G, G' and G* each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR60## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (i is 0 or a positive integer), --NH 2 , --CH═CH 2 , `Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above), R and R' each represent C w X 2w+2 (w is 0 or a positive integer, X represents H, F, Cl, Br or I), A represents a radical consisting of at least one element selected from C, H, N, O and S, p is a positive integer, g is 0 or a positive integer.

Claim 21

A magnetic storage medium, comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (4A) and (4B): ##STR58## wherein R f and R f * each represent C m F 2m+1 (m is a positive integer), R f ' and R f " each represent a radical consisting of carbon and fluorine atoms, J and J' each represent one of --S--, ##STR59## --NH--, --NH--CO--, --NHCO--NH-- and --NHCOO-- or a combination of two or more thereof wherein J is not --S--, G, G' and G* each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR60## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH (i is 0 or a positive integer), --NH 2 , --CH═CH 2 , `Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above), R and R' each represent C w X 2w+2 (w is 0 or a positive integer, X represents H, F, Cl, Br or I), A represents a radical consisting of at least one element selected from C, H, N, O and S, p is a positive integer, g is 0 or a positive integer.

Claim 22

A magnetic storage medium according to claim 17, wherein said lubricant layer is laid directly on the surface of said ferromagnetic material layer.

Claim 23

A magnetic storage medium according to claim 17, further comprising a protective film coated directly on the surface of said ferromagnetic material layer, said lubricant layer being laid directly on the surface of said protective film.

Claim 24

A magnetic storage medium according to claim 17, wherein said radical represented by A is selected from the group consisting of --CO--NH--CH 2 --CH 2 --, --NH--CH 2 --CH(OH)--CH 2 --CH 2 --, --NH--CO--CH 2 , --O--CH 2 --CH 2 --, --S--CH 2 --CH 2 , ##STR61##

Claim 25

A magnetic storage medium according to claim 17, wherein R f ' and R f " each represent ##STR62## wherein k is an integer, k' is 0 or an integer.

Claim 26

A magnetic storage medium according to claim 17, wherein said base is a disk.

Claim 27

A magnetic medium comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (5A), (5B), (5C), (5D), (5E) and (5F): ##STR63## wherein R f , R f *, R f ** and R f *** each represent C m F 2m+1 (m is a positive integer), R f ', R f ", R f '* and R f "* each represent a radical consisting of carbon and fluorine atoms, J', J", J"', J'*, J"* and J* each represent one of --O--, --S--, ##STR64## --NH--, --NH--CO--, --NHCO--NH-- and --NHCOO-- or a combination of two or more thereof on condition that J"' never represent --O--, R and R' each represents C w X 2+2 (w is 0 or an integer, X represent H, F, Cl, Br or I), G and G' each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR65## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH, --NH 2 , --CH═CH 2 , Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represents a radical consisting of at least one element selected from C, H, N, O and S), p is a positive integer, q is 0 or a positive integer, k is a positive integer, k' is 0 or a positive integer, p' is 0 or a positive integer, q' is a positive integer and i is 0 or a positive integer when referring to G and G' and i is a positive integer in all other cases.

Claim 28

A magnetic medium comprising a layer of a ferromagnetic material coated on a base and a lubricant layer formed on the outer side of the ferromagnetic material layer, said lubricant layer comprising a perfluoroalkyl compound represented by one of the general formulas (5A), (5B), (5C), (5D), (5E) and (5F): ##STR63## wherein R f , R f *, R f ** and R f *** each represent C m F 2m+1 (m is a positive integer), R f ', R f ", R f '* and R f "* each represent a radical consisting of carbon and fluorine atoms, J', J", J"', J'*, J"* and J* each represent one of --O--, --S--, ##STR64## --NH--, --NH--CO--, --NHCO--NH-- and --NHCOO-- or a combination of two or more thereof on condition that J"' never represent --O--, R and R' each represents C w X 2+2 (w is 0 or an integer, X represent H, F, Cl, Br or I), G and G' each represent a functional group selected from --NCO, --SH, --SO 3 H, --SO 3 M (M represents Na, K or Li), --CN, --NCS, --NO 2 , ##STR65## --CONH 2 , --I, --COOH, --COOC j H 2j+1 (j is a positive integer), --C i H 2i OH, --NH 2 , --CH═CH 2 , Si(C h H 2h+1 ) g X 3-g (h is a positive integer, g is 0, 1 or 2, X represents Cl, --OH, --OC f H 2f+1 (f is a positive integer) or --A--Si(C h H 2h+1 ) g X 3-g (h, g and X are as defined above, A represents a radical consisting of at least one element selected from C, H, N, O and S), p is a positive integer, q is 0 or a positive integer, k is a positive integer, k' is 0 or a positive integer, p' is 0 or a positive integer, q' is a positive integer and i is 0 or a positive integer when referring to G and G' and i is a positive integer in all other cases.

Claim 29

A magnetic storage medium according to claim 23, wherein said lubricant layer is laid directly on the surface of said ferromagnetic material layer.

Claim 30

A magnetic storage medium according to claim 23, further comprising a protective film on the surface of said ferromagnetic material layer, said lubricant layer being laid directly on the surface of said protective film.

Claim 31

A magnetic storage medium according to claim 23, wherein said radical represented by A is selected from the group consisting of --CO--NH--CH 2 --CH 2 --, --NH--CH 2 --CH(OH)--CH 2 --CH 2 --, --NH--CO--CH 2 --, --O--CH 2 --CH 2 --, --S--CH 2 --CH 2 --, ##STR66##

Claim 32

A magnetic storage medium according to claim 23, wherein R f ' and R f " each represent ##STR67## wherein k is an integer, k' is 0 or an integer.

Claim 33

A magnetic storage medium according to claim 23, wherein said base is a disk.