US 11,986,909 B2
Flux and solder paste
Kenta Inoue, Tokyo (JP); Nanako Miyagi, Tokyo (JP); Tomoko Nagai, Tokyo (JP); Kazuyori Takagi, Tokyo (JP); and Akiko Takaki, Tokyo (JP)
Assigned to SENJU METAL INDUSTRY CO., LTD., Tokyo (JP)
Appl. No. 18/036,940
Filed by SENJU METAL INDUSTRY CO., LTD., Tokyo (JP)
PCT Filed Nov. 17, 2021, PCT No. PCT/JP2021/042217
§ 371(c)(1), (2) Date May 15, 2023,
PCT Pub. No. WO2022/107802, PCT Pub. Date May 27, 2022.
Claims priority of application No. 2020-192036 (JP), filed on Nov. 18, 2020; and application No. 2021-090226 (JP), filed on May 28, 2021.
Prior Publication US 2023/0321767 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B23K 35/36 (2006.01); B23K 35/362 (2006.01)
CPC B23K 35/3613 (2013.01) [B23K 35/362 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A flux comprising:
a rosin;
a solvent;
a thixotropic agent; and
an activator,
wherein the thixotropic agent contains a compound represented by General Formula (3) and a polyamide,
the polyamide is a condensate of an aliphatic carboxylic acid, a hydroxy group-containing aliphatic carboxylic acid, and an amine,
a temperature of an endothermic peak of the polyamide by differential scanning calorimetry is in a range of 120° C. or higher and 200° C. or lower,
the aliphatic carboxylic acid includes a dicarboxylic acid,
an amount of the rosin is in a range of 30% by mass or more and 50% by mass or less with respect to a total mass of the flux,
an amount of the compound represented by General Formula (3) is in a range of 1% by mass or more and 10% by mass or less with respect to a total mass of the flux, and
an amount of the polyamide is in a range of 1% by mass or more and 15% by mass or less with respect to a total mass of the flux,

OG Complex Work Unit Chemistry
[in the formula, R11 and R11′ each independently represent a hydrocarbon group having 14 to 20 carbon atoms, R0a and R0a′ each represent a hydrogen atom, R0b2 represents a hydrocarbon group having 6 to 9 carbon atoms, R21 and R21′ each independently represent an alkylene group having 2 to 6 carbon atoms, and R0c and R0c′ each represent a single bond].