Patent ID: 7829733

Claim:
Process for manufacturing charge control agent whose active ingredient is a crystalline zinc 3,5-di-tert-butylsalicylate represented by General Formula (1) below, and having major peaks of X-ray diffraction using the CuK α-characteristic X-ray at Bragg angles 2θ of at least 5.2±0.2°, 6.7±0.2°, 7.7±0.2° and 15.7±0.2° comprising: [a] step for dissolving a 3,5-di-tert-butylsalicylic acid, which is obtained by butylation of salicylic acid, in an alkaline aqueous solution; [b] step for dissolving a zinc provider in water; [c] reaction step wherein the aqueous solution of 3,5-di-tert-butylsalicylic acid obtained in step [a] is added to the aqueous solution of a zinc provider obtained in step [b] while heating the aqueous solution of a zinc provider, and the mixture is stirred with heating until the reaction is completed: in which t-Bu represents a tert-butyl group.