Resin for magnetic recording media from vinyl chloride with quan

Details Resin for magnetic recording media from vinyl chloride with quan Resin for magnetic recording media from vinyl chloride with quan

1989-06-26

1991-07-02

Henderson, Christopher

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526287, 5262922, 5263171, C08F23002

Patent

active

050286765

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 quanternary ammonium salt groups in a reacting apparatus to thereby precipitate a vinyl chloride copolymer, the interior surface of said reactin apparatus, which comes into contact with said organic solvent solution being coated with a fluororesin.

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patent: 4737357 (1988-04-01), Lehmann
patent: 4741953 (1988-05-01), Katsuta et al.
patent: 4844991 (1989-07-01), Miura et al.
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4861683 (1989-08-01), Nakachi et al.

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