Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1990-02-26
1993-09-14
Thibodeau, Paul J.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428694B, 428900, G11B 500
Patent
active
052447430
ABSTRACT:
Disclosed is a magnetic recording medium having a magnetic layer comprising a vinyl chloride copolymer as a binder and a magnetic powder and formed on a non-magnetic support. The binder is a mixture comprised of (a) a vinyl chloride copolymer having a quaternary ammonium salt and a hydroxyl group and (b) a vinyl chloride copolymer having at least one anionic hydrophilic group selected from carboxylic acids, sulfur-containing acids, phosphorus-containing acids, and salts thereof, and a hydroxyl group. The ratio of copolymer (a) to copolymer (b) is such that the equivalent ratio of the quaternary ammonium salt in copolymer (a) to the anionic hydrophilic group in copolymer (b) is from 0.2 to 5.
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Nakamura Eitaro
Nakamura Katsuya
Nippon Zeon Co. Ltd.
Resan Stevan A.
Thibodeau Paul J.
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