Urethane resins

Details Urethane resins Urethane resins

1988-10-05

1990-02-06

Welsh, Maurice J.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 65, 528 76, 528 77, 528 80, 528 83, 528 85, C08G 1832

Patent

active

048989223

ABSTRACT:
Urethane resin having hydrophilic polar groups (mercapto groups) shows excellent dispersibility of magnetic powder when used as a binder for magnetic recording media. Magnetic recording media prepared by using the binder are excellent in surface-smoothness and durability. The mercapto groups contained in the magnetic layer react with isocyanate groups in the polyisocyanate to form thiourethane bonds to leave no hydrophilic polar groups, i.e., mercapto groups, and thus is excellent in moisture- and heat-resistance as well.
The resin and the binding agent are advantageously used in the production of magnetic recording media, for example, magnetic tape, magnetic disc, etc.

REFERENCES:
patent: 3114734 (1963-12-01), Gobran
patent: 3446780 (1969-05-01), Bertozzi
patent: 4152485 (1979-05-01), Mizumura et al.
patent: 4225695 (1980-09-01), Schuster et al.
patent: 4271289 (1981-06-01), Homan et al.
patent: 4320171 (1982-03-01), Motz et al.
patent: 4507458 (1985-03-01), Shiraki et al.
patent: 4668406 (1987-05-01), Chang
patent: 4680369 (1987-07-01), Kajimoto et al.
patent: 4689387 (1987-08-01), Kajimoto et al.
patent: 4742125 (1988-05-01), Schmidt et al.

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