Magnetic recording medium comprising a specified polyurethane bi

Details Magnetic recording medium comprising a specified polyurethane bi Magnetic recording medium comprising a specified polyurethane bi

1991-06-18

1992-05-19

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428900, G11B 500

Patent

active

051147939

ABSTRACT:
A magnetic recording medium which comprises a non-magnetic support and a magnetic layer thereon comprising a binder and powder of a ferromagnetic substance dispersed in the binder, the binder comprising a crosslinked product of a polyurethane having an average molecular weight of 900 to 50,000 and comprising at least one unit of the formula (I): ##STR1## in which R.sub.1, R.sub.2 and R.sub.4 each are an alkylene, R.sub.3 is a hydrocarbon group derived from a di-isocyanate compound and R.sub.5 is hydrogen or methyl, in one molecular thereof and having --OH, --NCO or --OOC--CR.sub.5 .dbd.CH.sub.2 at both terminals of the main chain thereof, provided that the terminals of the main chain are not --NCO when the molecular weight of the polyurethane ranges from 900 to 10,000. The polyurehtane resin can be prepared by using as a starting material a polymerizable dihydorxyl compound of the general formula (II): ##STR2## in which R.sub.1 R.sub.2 and R.sub.4 each are an alkylene, R.sub.3 is a hydrocarbon group and R.sub.5 is --H or --CH.sub.3.

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patent: 4634633 (1987-01-01), Ninomiya et al.
patent: 4727126 (1988-02-01), Chen

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