Patent ID: 9579738
Date: 2017-02-28
CPC Classifications: B23K

Claim:
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.