Patent ID: 11858072
Assignee: SENJU METAL INDUSTRY CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A flux comprising:
a rosin methyl ester,
an unesterified rosin and,
an activator which includes an organic halogen compound activator,
wherein a content of the rosin methyl ester is 0.5% to 20% by mass with respect to a total mass of the flux,
wherein a content of the unesterified rosin is 73% to 98.9% by mass with respect to the total mass of the flux,
wherein the flux is solid at 25° C. or is solid-like having a viscosity η1 at 25° C. of 3,200 Pa·s or more when the viscosity is measured by the steps comprising:
sandwiching the flux between parallel flat plates of a rheometer and deforming by narrowing a space between the parallel flat plates while heating at 100° C.
thereby forming a thin sample of the flux having a thickness of 0.5 mm,
cooling the thin sample to 25° C.,
rotating the parallel flat plates of the rheometer at 6 Hz;
measuring the viscosity η1 at 25° C. 5 minutes after rotating parallel flat plates; and

wherein the flux is used for an inside of a flux-cored solder or an exterior of a flux-coated solder.