Magnetic recording media having a binder comprising a low molecular weight high glass transition temperature vinyl polymer
First Claim
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1. A magnetic particle recording medium comprising a non-magnetic substrate having a magnetic layer placed thereon wherein said layer is derived from a magnetic particle coating composition which comprises a) magnetic particles, b) polyurethane, c) polyisocyanate, and d) a low molecular weight, high Tg vinyl polymer having a Tg of about 40°
- C. or more and a number average molecular weight of about 15,000 or less and characterized by having one or more primary alcohol containing groups pendant to the non-terminal portions thereof.
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Abstract
Disclosed are magnetic particle coating compositions employing a low molecular, high Tg vinyl polymers characterized by having one or more primary alcohol containing groups pendant to the polymer chain.
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Citations
31 Claims
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1. A magnetic particle recording medium comprising a non-magnetic substrate having a magnetic layer placed thereon wherein said layer is derived from a magnetic particle coating composition which comprises a) magnetic particles, b) polyurethane, c) polyisocyanate, and d) a low molecular weight, high Tg vinyl polymer having a Tg of about 40°
- C. or more and a number average molecular weight of about 15,000 or less and characterized by having one or more primary alcohol containing groups pendant to the non-terminal portions thereof.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of increasing the Tg of the magnetic layer of a magnetic particle recording medium, wherein said magnetic layer is derived from a magnetic particle coating composition comprising magnetic particles, polyurethane and polyisocyanate, said method comprises adding to said composition a low molecular weight, high Tg vinyl polymer having a Tg of about 40°
- C. or more and a number average molecular weight of about 15,000 or less and characterized by having one or more primary alcohol containing groups pendant to the non-terminal portions thereof.
- View Dependent Claims (18, 19, 20, 21, 22)
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23. A magnetic recording medium comprising a non-magnetic substrate, a magnetic layer and a backcoat derived from a backcoat composition which comprises a) an organic solvent, b) polyurethane, c) polyisocyanate, d) a low molecular weight, high Tg vinyl polymer having a Tg of about 40°
- C. or more and a number average molecular weight of about 15,000 or less and characterized by one or more primary alcohol containing groups pendent to the non-terminal portions thereof, and e) an antistat.
- View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
Specification