Magnetic recording medium prepared with polyurethane resin modif

Details Magnetic recording medium prepared with polyurethane resin modif Magnetic recording medium prepared with polyurethane resin modif

1989-11-06

1991-04-23

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428900, 4284259, G11B 2300

Patent

active

050099604

ABSTRACT:
A magnetic recording medium is disclosed which comprises a non-magnetic support and a magnetic coating layer formed thereon, the magnetic coating layer being formed by applying a magnetic coating composition comprising a resinous binder and magnetic particles dispersed therein, wherein the coating composition contains, as a resinous binder, a modified polyurethane resin obtained by reacting a polyurethane resin (A) with a bicyclic amide acetal (B), the polyurethane resin (A) having carboxyl groups in an amount of 50 to 2,000 equivalents/10.sup.6 g and the equivalent ratio of the bicyclic amide acetal (B) to the carboxyl groups of the polyurethane resin (A) being within the range of 0.5 to 2.0.

REFERENCES:
patent: 4152485 (1979-05-01), Mizumura et al.
patent: 4584363 (1986-04-01), Goel et al.
patent: 4842942 (1989-06-01), Yatsuka et al.

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