Appeal No. 1999-0097
Application No. 08/532,976
1. A magnetic recording medium, comprising a magnetic
layer containing ferromagnetic powder dispersed by a binder,
the magnetic layer being located on a non-magnetic support
member, wherein said binder comprises a polyurethane resin
prepared by reacting a long chain diol having a weight average
molecular weight of 800
to 5,000, a short chain
diol having a weight
average molecular weight
of 50 to 500, and an
organic diisocyanate,
wherein said long chain
diol is present in said
polyurethane resin in an
amount of 1 to 5 mol% and is represented by the following
formula (1):
where R represents a polyalkyleneglycol residual group.
The examiner relies upon the following references as
evidence of obviousness:
Kolycheck et al. (Kolycheck) 4,643,949 Feb. 17, 1987
Ohkubo et al. (Ohkubo) 5,071,578 Dec. 10, 1991
Appellants' claimed invention is directed to a magnetic
recording medium comprising a magnetic layer which contains a
-2-
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