Rigid magnetic coating composition with thermosetting binder for

Details Rigid magnetic coating composition with thermosetting binder for Rigid magnetic coating composition with thermosetting binder for

1982-11-15

1983-09-20

Pianalto, Bernard D.

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Physical dimension specified

428 64, 428418, 4284259, 428457, 428694, B32B 1504, H01F 1002

Patent

active

044056842

ABSTRACT:
A magnetic recording disk coating having a high density of magnetic particles uniformly dispersed in a high performance, thermoset polyurethane resin binder with the dispersion applied as a thin coating onto a rigid substrate. The thermosetting resin binder comprises a blocked isocyanate polymer reacted with hydroxy terminated or branched oligomer or oligomers. The coating composition has an extended shelf life and can be cured at temperatures below 375.degree. F. to produce a smooth, hard, tough durable and well dispersed magnetic coating with an improved orientation ratio that readily accepts buffing, washing, and lubrication.

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