Magnetic recording media containing elastomeric polyurethane bin

Details Magnetic recording media containing elastomeric polyurethane bin Magnetic recording media containing elastomeric polyurethane bin

1980-05-19

1982-03-16

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

4284237, 4284251, 4284259, 428900, 528 44, 528 76, B32B 2740, B32B 516

Patent

active

043201717

ABSTRACT:
Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).

REFERENCES:
patent: 2899411 (1959-08-01), Schollenberger
patent: 2901467 (1959-08-01), Croco
patent: 3144352 (1964-08-01), Talley
patent: 3149995 (1964-09-01), Bauer

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