Magnetic recording medium

A magnetic recording medium comprising a non-magnetic support and a coating of a dispersion of a magnetic powder in a binder, said binder consisting essentially of a cured compound derived from:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 10 to 60 percent by weight of the binder and represented by the following formula:
• ##STR10## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR11## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR12## X is a dispersing group such as ##STR13## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) a polyoxyalkyl polyol represented by the following formula:
• ##STR14## wherein Z is --OH;
• and (3) an organic isocyanate compound,
• wherein said phosphorylated polyoxyalkyl polyol, said polyoxyalkyl polyol, and said isocyanate compound are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A magnetic recording medium comprising a non-magnetic support and a coating of a dispersion of a magnetic powder in a binder, said binder consisting essentially of a cured compound derived from:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 5 to 60 percent by weight of the binder and represented by the following formula:
• ##STR15## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR16## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR17## X is a dispersing group such as ##STR18## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) an organic isocyanate compound, and
• (3) a vinyl polymer
• wherein said phosphorylated polyoxyalkyl polyol, said isocyanate compound and said vinyl polymer are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A magnetic recording medium comprising a non-magnetic support and a coating of a dispersion of a magnetic powder in a binder, said binder consisting essentially of a cured compound derived from:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 5 to 60 percent by weight and represented by the following formula:
• ##STR19## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR20## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR21## X is a dispersing group such as ##STR22## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) a polyoxyalkyl polyol represented by the following formula:
• ##STR23## wherein Z is --OH;
• (3) an organic isocyanate compound;
• and
• (4) a vinyl polymer;
• wherein said phosphorylated polyoxyalkyl polyol, said polyoxyalkyl polyol, said isocyanate compound and said vinyl polymer are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A dispersion of a magnetic powder in a binder, said dispersion consisting essentially of:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 30 to 80 percent by weight of the binder and represented by the following formula:
• ##STR24## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR25## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR26## X is a dispersing group such as ##STR27## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• and
• (2) an organic isocyanate compound;
• wherein said phosphorylated polyoxyalkyl polyol and said organic isocyanate compound are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A dispersion of a magnetic powder in a binder, said dispersion consisting essentially of:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 10 to 60 percent by weight of the binder and represented by the following formula:
• ##STR28## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR29## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR30## X is a dispersing group such as ##STR31## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) a polyoxyalkyl polyol represented by the following formula wherein:
• ##STR32## wherein Z is --OH;
• and (3) an organic isocyanate compound,
• wherein said phosphorylated polyoxyalkyl polyol, said polyoxyalkyl polyol, and said isocyanate compound are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A dispersion of a magnetic powder in a binder, said dispersion consisting essentially of:

• (1) a phosphorylated polyoxyalkyl polyol present in the amount in the range of 5 to 60 percent by weight of the binder and represented by the following formula:
• ##STR33## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR34## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR35## X is a dispersing group such as ##STR36## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) an organic isocyanate compound;
• and
• (3) a vinyl polymer;
• wherein said phosphorylated polyoxyalkyl polyol, said isocyanate compound and said vinyl polymer are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.

A dispersion of a magnetic powder in a binder, said dispersion consisting essentially of:

• (1) a phosphorylated polyoxyalkyl polyol present in an amount in the range of 5 to 60 percent by weight and represented by the following formula:
• ##STR37## wherein n.sub.1, n.sub.2 and n.sub.3 may independently be 0 to 10 inclusive and n.sub.4 is 0 or 1
• R.sub.1, R.sub.2, R.sub.3 are independently selected from the group consisting of ##STR38## R.sub.4 is selected from the group consisting of H, --CH.sub.3, --CH.sub.2 --CH.sub.3, --CH.sub.2 --CH.sub.2 --CH.sub.3, ##STR39## X is a dispersing group such as ##STR40## wherein Y.sub.1 and Y.sub.2 are selected from the group consisting of H, Na, Li, K;
• (2) a polyoxyalkyl polyol represented by the following formula:
• ##STR41## wherein Z is --OH;
• (3) an organic isocyanate compound;
• and
• (4) a vinyl polymer;
• wherein said phosphorylated polyoxyalkyl polyol, said polyoxyalkyl polyol, said isocyanate compound and said vinyl polymer are present in a ratio which effectively homogeneously disperses said magnetic powder and securely binds said magnetic powder when coated on said non-magnetic support.