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

A coating film forming agent that can form on the outer circumference of tapping screw a coating film capable of trapping any internal thread formation waste occurring at the time of driving the tapping screw into a pilot hole of work and thus capable of preventing any scattering of internal thread formation waste to environment; and a tapping screw with coating film formed with the use of the coating film forming agent. This coating film forming agent is a composition composed mainly of either calcium montanate or a montanate mixture containing calcium montanate, a thermoplastic resin emulsion and water. With the use of this coating film forming agent, a coating film with lubricating function and internal thread formation waste trapping function can be formed around the outer circumference of tapping screw.