Water-based chromium dioxide magnetic recording media

Details Water-based chromium dioxide magnetic recording media Water-based chromium dioxide magnetic recording media

1983-03-21

1984-06-12

Griffin, Ronald W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

106 20, 106 37, 106308Q, 252 6254, 427 47, 427127, 427128, 428900, 524591, B32B 516, C08L 7504, C09D 1100

Patent

active

044542828

ABSTRACT:
A stable, non-agglomerating, magnetic recording coating ink, for use in coating a flexible non-magnetic substrate, is made by a two-step process which first mixes finely divided chromium dioxide particles with water and a polymeric surfactant/dispersant agent which has as its major functionality in a side chain, carboxylic acid, as a free acid, ester or amide thereof, and of a relatively low number average molecular weight in the range 500 to 20,000. Only after the particles are dispersed in this slurry is water-based polyurethane binder added to the slurry, as the second step in the process, to form the final ink.

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patent: 4388376 (1983-06-01), Kubota

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