Resin for magnetic recording media from vinyl chloride polymer w

Details Resin for magnetic recording media from vinyl chloride polymer w Resin for magnetic recording media from vinyl chloride polymer w

1989-06-26

1991-04-16

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526212, 526307, C08F22034

Patent

active

050083570

ABSTRACT:
A resin used for magnetic recording media, comprising a vinyl chloride copolymer containing vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups as component units. The resin is made by a method which comprises polymerizing an organic solvent solution containing vinyl chloride, vinyl monomers with hydroxyl groups and vinyl monomers with quaternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reacting apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.

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patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4861683 (1989-08-01), Nakachi et al.

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