# US 11,305,385 B2 · Flux

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- Number: US 11,305,385 B2
- Document ID: US11305385B2
- Status: Granted
- Kind: B2
- Application number: 15/869,202
- Filed: 2018-01-12
- Published: 2018-07-19
- Granted: 2022-04-19
- Earliest claimed: 2017-01-13
- Assignees: Senju Metal Industry Co., Ltd.
- Applicants: Senju Metal Industry Co., Ltd.
- Inventors: Tomohisa Kawanago; Miyuki Hiraoka; Takahiro Nishizaki; Naokatsu Kojima; Hiroyoshi Kawasaki
- Web page: https://patentgrep.com/patent/US11305385B2

## CPC

- B23K 35/362: Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence)
- B23K 35/3612: {with organic compounds as principal constituents}
- B23K 35/3618: {Carboxylic acids or salts}
- H05K 3/3489: Composition of fluxes; Application thereof; Other processes of activating the contact surfaces
- B23K 2101/36: Electric or electronic devices
- B23K 2101/42: Printed circuits
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

Provided is a flux which is rosin-free and contains 50% by mass or more and 90% by mass or less of 2,4-diethyl-1,5-pentanediol, more than 0% by mass and less than 50% by mass of a solvent, 1% by mass or more and 15% by mass or less of an organic acid, wherein the total amount of the 2,4-diethyl-1,5-pentanediol and the solvent is 83% by mass or more and 99% by mass or less. This flux does not require washing with an organic detergent when transferred to solder balls is provided.

## Claims

### Claim 1

A flux which is rosin-free and consists of:
50% by mass or more and 90% by mass or less of 2,4-diethyl-1,5-pentanediol,
more than 0% by mass and less than 50% by mass of a solvent,
1% by mass or more and 15% by mass or less of an organic acid component,
0% by mass or more and 5% by mass or less of an amine,
0% by mass or more and 5% by mass or less of a halogen compound,
0% by mass or more and 5% by mass or less of a thixotropic agent,
0% by mass or more and 5% by mass or less of a base agent, and
0% by mass or more and 15% by mass or less of a surfactant,
wherein the total amount of the 2,4-diethyl-1,5-pentanediol and the solvent is 83% by mass or more and 99% by mass or less, and
wherein the organic acid component is selected from the group consisting of: glutaric acid, phenyl succinic acid, succinic acid, malonic acid, adipic acid, azelaic acid, diglycolic acid, thiodiglycolic acid, malic acid, tartaric acid, dimer acid, hydrogenated dimer acid, trimer acid, and combinations thereof.

### Claim 2 (depends on 1)

The flux according to claim 1, wherein the weight of the flux after heating is 15% or less of the weight of the flux before heating, when packing 10 mg of the flux in an aluminum pan and heating the flux up to 250° C. at a temperature rising rate of 1° C./sec.