Polyurethane resins

Details Polyurethane resins Polyurethane resins

1980-06-20

1981-08-18

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...

360134, 427132, 4284259, 528 83, C08G 1842

Patent

active

042847508

ABSTRACT:
Thermoplastic polyurethane compositions having excellent mechanical and thermal properties, high hardness and the capabilty of binding or adhering to magnetic pigments, formed by reacting 1,4-cyclohexanedimethanol with a dicarboxylic acid such as adipic, azelaic or 1,12-dodecanedioic acid, or mixtures thereof in a hydroxyl number range of from about 50 to about 250 to form a hydroxyl-terminated polyester, combining the polyester so formed with a chain extender to form a mixture in a hydroxyl number range of from about 130 to about 300 and reacting said mixture with a diisocyanate to form the polyurethane resin. Such polyurethanes display excellent binding properties for adhering magnetic iron oxide or other magnetic pigments to flexible substrates to form magnetic tape.

REFERENCES:
patent: 2871218 (1959-01-01), Schollenberger
patent: 4152485 (1979-05-01), Miyumura et al.
patent: 4154895 (1979-05-01), Ogawa et al.

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