Flux composition and techniques for use thereof

Patent metadata

Field	Value
Publication number	US-9579738-B2
Application number	US-201113034932-A
Country	US
Kind code	B2
Filing date	Feb 25, 2011
Priority date	Feb 25, 2011
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

The present invention is directed to flux compositions. One composition comprises an activator, a medium-viscosity solvent being a polymer, and a high-viscosity solvent being a copolymer containing first monomers and second monomers. Another composition comprises an activator, and a high-viscosity solvent comprising a copolymer containing first monomers and second monomers. Another composition comprises an activator of 6-12 percent by weight of glutaric acid, pimelic acid, tartaric acid, or mixtures thereof, and a medium-viscosity solvent of 88-94 percent by weight comprising a polymer with hydroxyl end groups. Another composition comprises an activator in a liquid state comprising poly(ethylene glycol)-diacid, and a medium-viscosity solvent comprising a polymer with hydroxyl end groups.

First claim

What is claimed is:

1. A flux composition comprising:
about five percent by weight to about twenty percent by weight of an activator comprising a mixture of acetyl butyric acid, levulinic acid, 2-acetylbenzoic acid, 2-acetyloxybenzoic acid, 2-ketobutyric acid, acetoxyacetic acid, and pyruvic acid;
about fifteen percent by weight to about seventy-five percent by weight of a medium-viscosity solvent being a polymer, wherein the medium-viscosity solvent comprises a mixture of glycerol ethoxylate, glycerol propoxylate, and a glycerol ethoxylate-propoxylate copolymer;
about twenty percent by weight to about eighty percent by weight of a high-viscosity solvent being a random copolymer containing a plurality of first monomers and a plurality of second monomers combined in a random sequence to form the random copolymer, wherein the random copolymer comprises two hydroxyl end groups, and wherein the high-viscosity solvent is in a liquid state at room temperature; and
about four percent by weight to about ten percent by weight of multi-amines, wherein the multi-amines comprises tetra(hydroxyethyl)ethylenediamine.

2. The composition of claim 1 , wherein the medium-viscosity solvent comprises a polymer with three hydroxyl end groups, and wherein the high-viscosity solvent comprises a copolymer with two hydroxyl end groups.

3. The composition of claim 1 , wherein the high-viscosity solvent comprises at least one of an ethylene glycol-propylene glycol random copolymer, an ethylene glycol-propylene glycol-ethylene glycol block copolymer, and mixtures thereof.

4. The composition of claim 1 , wherein the activator further comprises multi-acids that contain two or more carboxylic acid groups, wherein the multi-acids comprise one of diethylenetriamine pentaacetic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, tartaric acid and poly(acrylic acid).

5. The composition of claim 1 , further comprising one or more highly tacky multi-acids.

6. A flux composition comprising:
about five percent by weight to about twenty percent by weight of an activator comprising a mixture of acetyl butyric acid, levulinic acid, 2-acetylbenzoic acid, 2-acetyloxybenzoic acid, 2-ketobutyric acid, acetoxyacetic acid, and pyruvic acid;
about twenty percent by weight to about eighty percent by weight of a high-viscosity solvent, wherein the high-viscosity solvent comprises a random copolymer containing a plurality of first monomers and a plurality of second monomers combined in a random sequence to form the random copolymer, wherein the random copolymer comprises two hydroxyl end groups, and wherein the high-viscosity solvent is in a liquid state at room temperature; and
about four percent by weight to about ten percent by weight of multi-amines, wherein the multi-amines comprises tetra(hydroxyethyl)ethylenediamine.

7. A flux composition comprising:
about six percent by weight to about twelve percent by weight of an activator comprising a mixture of acetyl butyric acid, levulinic acid, 2-acetylbenzoic acid, 2-acetyloxybenzoic acid, 2-ketobutyric acid, acetoxyacetic acid, and pyruvic acid;
a medium-viscosity solvent of about 88-94 percent by weight based on total weight of the composition, wherein the medium-viscosity solvent comprises a polymer with at least two hydroxyl end groups to produce a tackiness of the flux composition of approximately 260-330 gram force, wherein the medium-viscosity solvent comprises a mixture of glycerol ethoxylate, glycerol propoxylate, and a glycerol ethoxylate-propoxylate copolymer; and
about four percent by weight to about ten percent by weight of multi-amines, wherein the multi-amines comprises tetra(hydroxyethyl)ethylenediamine.

Assignees

• Lee Kang-Wook
• Nah Jae-Woong
• Normand Nathalie
• Oberson Valerie
• IBM

Inventors

• Lee Kang-Wook
• Nah Jae-Woong
• Normand Nathalie
• Oberson Valerie

Classifications

• B23K1/0016 Primary

  Soldering of electronic components · CPC title

• B23K35/362

  Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) · CPC title

• B23K35/3601

  with inorganic compounds as principal constituents · CPC title