MAGNETIC RECORDING CARRIER

摘要

PURPOSE: To improve a slippery characteristic and to lessen friction by using a nonmagnetic base body material and magnetic material powder in a binder contg. at least 50wt.% thermoplastic polyurethane as chief materials and using the specific plastic polyurethane. CONSTITUTION: This magnetic recording carrier consists of the nonmagnetic base body material and the magnetic material powder in the binder contg. at least 50wt.% thermoplastic polyurethane as the chief materials and has at least one layer of magnetic layers adhered and formed on a base body. In such a case, the thermoplastic polyurethane has 30 to 160 pieces and more particularly 40 to 80 pieces of OH groups and has a mol.wt. from 4000 to 30000 corresponding to a K value of 20 to 45 (measured as 1% soln. in DMF). As a result, the recording carrier having the improved wear resistance and decreased coefft. of friction is obtd.