Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1995-03-10
1996-07-02
Bonner, Melissa
Compositions
Magnetic
With wax, bitumen, resin, or gum
252 6252, 4304951, 430496, 430501, 430523, 430140, 428694B, 428694BA, 428694BN, G11B 5702, G11B 5633, G11B 5712, G03C 724
Patent
active
055319130
ABSTRACT:
An aqueous coating composition for forming a transparent magnetic recording layer contains a fine solid particle aqueous dispersion of dispersed magnetic particles, gelatin, and a polyelectrolyte having a molecular weight of at least 50,000. The coating composition may be prepared by milling an aqueous slurry of magnetic particles and a surface active dispersant having an HLB number of at least 8 until there are substantially no agglomerates of magnetic particles present, and then combining the milled dispersion with the gelatin and polyelectrolyte. The coating composition can be used to prepare magnetic recording elements and, in particular, photographic elements having a transparent, substantially haze-free magnetic recording layer.
REFERENCES:
patent: 4404253 (1983-09-01), Kohler et al.
patent: 4562117 (1985-12-01), Kikukawa et al.
patent: 4761338 (1988-08-01), Asano et al.
patent: 4965007 (1990-10-01), Yudelson
patent: 5147768 (1992-09-01), Sakakibara
patent: 5229259 (1993-07-01), Yokota
Lobo Lloyd A.
Nair Mridula
Oltean George L.
Anderson Andrew J.
Bonner Melissa
Eastman Kodak Company
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