Method of making sulfonated hydroxy-functional polyurethane bind

Details Method of making sulfonated hydroxy-functional polyurethane bind Method of making sulfonated hydroxy-functional polyurethane bind

1991-07-29

1993-02-09

Thibodeau, Paul J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

525131, 528 44, 4284259, 428694, C08G 1832

Patent

active

051854236

ABSTRACT:
The present invention concerns magnetic recording media comprising fine, magnetizable pigment for 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 SO.sub.3 M groups are pendant from the polyurethane polymer backbone. The SO.sub.3 M groups have an equivalent weight of from about 2,000 to about 100,000. M is selected from the group consisting of H.sup.+, Li.sup.+, Na.sup.+, K.sup.+, NR.sub.4.sup.+ where R can be H.sup.+ 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.

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