Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1989-05-19
1992-07-07
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Composite
Of inorganic material
428900, 252 6254, G11B 500
Patent
active
051282151
ABSTRACT:
The present invention provides an improved magnetic recording medium comprising a non-magnetic support with at least one magnetic layer comprising a magnetizable pigment dispersed in a binder composition. The binder composition of the present invention comprises a block copolymer, having a hard segment, with a glass transition temperature (T.sub.g) of greater than about 70.degree. C., and a soft segment, having a T.sub.g of less than about -30.degree. C. The binder composition of the present invention has relatively stable physical properties over a range of temperatures, preferably at least 50.degree. C. at more preferably at least 100.degree. C.
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"Effect of Surface Treatments on Rheological, Mechanical and Magnetic Properties of Ferrite-Filled Polymeric Systems", D. R. Saini, A. V. Shenoy, and V. M. Nadkarni, Polymer Engineering and Science, No. 13, 25, 807 (1985).
Cashion Jr. Merrell C.
Minnesota & Mining Manufacturing Company
Resan Stevan A.
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