| 摘要 |
PURPOSE:The titled dispersant providing a magnetic recording material having improved traveling stability, ratio of S/N, etc., eliminating aggregation of magnetic component, improving dispersibility, comprising a salt of a copolymer of a specific monomer such as isobutylene, etc., and maleic acid (anhydride). CONSTITUTION:(A) At least one monomer selected from isobutylene, styrene and acrylic acid ester is reacted with (B) maleic acid (anhydride) and, if necessary, in the presence of a solvent such as ethylbenzene, etc., and a catalyst such as benzoyl peroxide, etc., at 45-200 deg.C for 1-10hr to give a copolymer (salt) having preferably 1,000-200,000 number-average molecular weight. The aimed dispersant comprising the copolymer (salt).
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