Magnetic recording medium comprising a magnetic layer and a sub

Details Magnetic recording medium comprising a magnetic layer and a sub Magnetic recording medium comprising a magnetic layer and a sub

1995-09-07

1996-10-01

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428128, 428336, 428694BM, 428694BS, 428900, G11B 571

Patent

active

055609830

ABSTRACT:
A magnetic recording medium is described, which comprises a nonmagnetic support having on at least one side thereof a lower layer and an upper layer, in which the upper layer is a magnetic layer mainly comprising ferromagnetic particles and a binder resin, and the lower layer is adjacent to the magnetic layer and is either a magnetic layer mainly comprising ferromagnetic particles and a binder resin or a nonmagnetic layer mainly comprising nonmagnetic particles and a binder resin, wherein the upper layer has a thickness of from 0.05 to less than 1.0 .mu.m the lower layer has a thickness of from 1 to 5 .mu.m and contains unsaturated alkyl carbonate having from 17 to 45 total carbon atoms represented by the following formula in an amount of from 1.8 to 100% by weight based on the amount of the binder resin: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each represents a chain hydrocarbon group having from 8 to 22 carbon atoms, provided that at least one of R.sub.1 and R.sub.2 contains one or more unsaturated bonds; and 60 to 100% by weight of the ferromagnetic particles and nonmagnetic particles contained in the lower layer, in the case where the lower layer is a magnetic layer, has a specific surface area of from 1 to 150 m.sup.2 /g; or 60 to 100% by weight of the nonmagnetic particles contained in the lower layer, in the case where the lower layer is a nonmagnetic layer, has a specific surface area of from 1 to 150 m.sup.2 /g.

REFERENCES:
patent: 3987232 (1976-10-01), Huguenard et al.
patent: 4015042 (1977-03-01), Chassaigne
patent: 4032682 (1977-06-01), Masson
patent: 5026577 (1991-06-01), Biresaw et al.
patent: 5075167 (1991-12-01), Yamauchi et al.

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