Flexible magnetic recording media having a polyester-polyurethan

Details Flexible magnetic recording media having a polyester-polyurethan Flexible magnetic recording media having a polyester-polyurethan

1983-12-30

1985-06-25

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 360134, 360135, 360136, 428329, 428694, 428900, 427128, G11B 570, B32B 2740

Patent

active

045254249

ABSTRACT:
Flexible magnetic recording media having chromium dioxide magnetic particles dispersed in a polyester-polyurethane binder which is a reaction product of (A) a hydroxyl-terminated polyester which itself is a reaction product of a hydrolytically stable difunction alcohol (preferably 1,4-cyclohexanedimethanol), (B) a chain extender (preferably 1,4-butanediol), and (C) an aromatic diisocyanate [preferably 4,4'-methylenebis (1,4-phenylene) diisocyanate (MDI)]. The proportions of (A), (B) and (C) are selected to produce a polyester polyurethane having a hard segment content in the range of 37 to 40 percent by weight, of a molecular weight above 60,000, with the soft segment molecular weight (M.sub.n) being in the range of about 500 to 1500.

REFERENCES:
patent: 3929659 (1975-12-01), Graham
patent: 4284750 (1981-08-01), Amirsakis
patent: 4286022 (1981-08-01), Vermillion
patent: 4303738 (1981-12-01), Gini et al.
patent: 4420601 (1983-12-01), Kuroda
patent: 4477531 (1984-10-01), Kohler

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