Magnetic recording medium having a binder composition comprising phosphonated polyurethane and a vinyl chloride copolymer with ammonium functionalities
AssigneeMinnesota Mining and Manufacturing Company
InventorsChristopher M. Evans, Colin F. Norman
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Abstract
A binder composition suitable for use with magnetic media comprising: (i) a phosphonated polyurethane having a plurality of units of the formula: ##STR1## wherein: the nitrogen atom forms part of the backbone chain of the polymer, and R.sup.1 and R.sup.2 independently represent members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, cycloalkyl groups and aryl groups of 6 to 10 carbon atoms or together R.sup.1 and R.sup.2 comprise the necessary carbon atoms to complete a ring, and (ii) a vinyl chloride copolymer having pendant ammonium functionalities.
Claims17
A magnetic recording medium comprising a substrate bearing a binder composition having magnetic pigment dispersed therein wherein said binder composition comprises:
- (i) a phosphonated polyurethane having a plurality of units of the formula:
- ##STR4## wherein:
- the nitrogen atom forms part of the backbone chain of the polymer, and
- R.sup.1 and R.sup.2 independently represent members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, cycloalkyl groups and aryl groups of 6 to 10 carbon atoms or together R.sup.1 and R.sup.2 comprise the necessary carbon atoms to complete a ring, and
- (ii) a vinyl chloride copolymer having pendant ammonium functionalities.
A binder composition suitable for use with magnetic media comprising:
- (i) a phosphonated polyurethane having a plurality of units of the formula:
- ##STR5## wherein:
- the nitrogen atom forms part of the backbone chain of the polymer, and
- R.sup.1 and R.sup.2 independently represent members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, cycloalkyl groups and aryl groups of 6 to 10 carbon atoms or together R.sup.1 and R.sup.2 comprise the necessary carbon atoms to complete a ring, and
- (ii) a vinyl chloride copolymer having pendant ammonium functionalities.
Dependencies are inferred from the claim text.