US 12,330,244 B2
Flux, solder paste, and method for producing bonded body
Keisuke Shinozaki, Tokyo (JP); Kazuya Kitazawa, Tokyo (JP); Hiroaki Kawamata, Tokyo (JP); and Yuki Fujino, Tokyo (JP)
Assigned to Senju Metal Industry Co., Ltd., Tokyo (JP)
Appl. No. 18/880,717
Filed by SENJU METAL INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Jul. 21, 2023, PCT No. PCT/JP2023/026807
§ 371(c)(1), (2) Date Jan. 2, 2025,
PCT Pub. No. WO2024/024676, PCT Pub. Date Feb. 1, 2024.
Claims priority of application No. 2022-118197 (JP), filed on Jul. 25, 2022.
Prior Publication US 2025/0170679 A1, May 29, 2025
Int. Cl. B23K 35/36 (2006.01); B23K 35/02 (2006.01)
CPC B23K 35/3613 (2013.01) [B23K 35/025 (2013.01); B23K 35/3618 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A flux comprising: at least one selected from the group consisting of isobornyl cyclohexanol and trimethylolpropane; a compound of general formula (1), the compound having a boiling point of 250° C. or more and a relative permittivity of 6.0 or more; and a thixotropic agent, wherein
resin components are not comprised,
the thixotropic agent comprises a polyamide which is condensate of an aliphatic carboxylic acid, a hydroxy group-containing aliphatic carboxylic acid and an amine,
an amount of the at least one selected from the group consisting of isobornyl cyclohexanol and trimethylolpropane relative to a total mass, 100% by mass, of the flux is 30% by mass or more, and
an amount of the polyamide relative to the total mass of the flux, 100% by mass, exceeds 2% by mass,

OG Complex Work Unit Chemistry
in the formula, R1 is a hydrocarbon group having two to four carbon atoms, R2 is a hydrocarbon group having four to ten carbon atoms, and m is 1 to 3.