C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/2012, 400/30
C08G 18/77 (2006.01) C08G 18/08 (2006.01) C08L 75/04 (2006.01) G11B 5/702 (2006.01) H01F 10/10 (2006.01)
Patent
CA 2005901
ABSTRACT OF THE DISCLOSURE The present invention concerns magnetic recording media comprising fine, magnetizable pigment or particles dispersed within a binder and supported on a substrate. The invention particularly concerns the nature of the binder polymer and its preparation. The binder polymer is a curable polymer comprising a sulfonated, hydroxy-functional polyurethane polymer. A plurality of SO3M groups are pendant from the polyurethane polymer backbone. The SO3M groups have an equivalent weight of from about 2,000 to about 100,000. M is selected from the group consisting of H+, Li+, Na+, K+, NR4+ where R can be H+ or an alkyl group, and mixtures thereof. A plurality of hydrophobic polymer chain segments are incorporated into the polyurethane polymer that comprise residues of a polyol having a molecular weight of at least about 180. The hydrophobic chain segments have a carbon atom to polar functionality of at least about 60. The polyurethane polymer also comprises a plurality of cross-linkable hydroxy groups having an equivalent weight of from about 500 to about 10,000. At least a majority of the hydroxy groups are pendant from hydrophobic chain segments.
Carlson James G.
Ohkubo Takatoshi
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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