COATING FILM FORMING AGENT FOR TAPPING SCREW, METHOD OF PREPARING THE COATING FILM FORMING AGENT, METHOD OF FORMING COATING FILM PROVIDED ON OUTER CIRCUMFERENCE OF TAPPING SCREW WITH USE OF THE COATING FILM FORMING AGENT, AND TAPPING SCREW WITH COATING FILM FORMED WITH USE OF THE COATING FILM FORMING AGENT

摘要

Provided are a coating agent capable of forming, on the periphery of a tapping screw, a coating layer which can hold female-thread-forming chips generated during screwing of the tapping screw into a prepared hole of a workpiece, thereby preventing scattering of the female-thread-forming chips; and a tapping screw having thereon a coating layer formed from the coating agent.

The coating agent is a composition containing, as primary components, calcium montanate or a calcium-montanate-containing montanic acid species mixture, a thermoplastic resin emulsion, and water. The coating agent can form, on the periphery of a tapping screw, a coating layer which exhibits a lubricating function, and a function of capturing female-thread-forming chips.