US 9,808,874 B2
Flux composition and techniques for use thereof
Kang-Wook Lee, Yorktown Heights, NY (US); Jae-Woong Nah, New York, NY (US); Nathalie Normand, Bromont (CA); and Valerie Oberson, St-Alphonse de Granby (CA)
Assigned to International Business Machines Corporation, Armonk, NY (US)
Filed by Kang-Wook Lee, Yorktown Heights, NY (US); Jae-Woong Nah, New York, NY (US); Nathalie Normand, Bromont (CA); and Valerie Oberson, St-Alphonse de Granby (CA)
Filed on Sep. 13, 2012, as Appl. No. 13/613,000.
Application 13/613,000 is a continuation of application No. 13/034,932, filed on Feb. 25, 2011.
Prior Publication US 2013/0001279 A1, Jan. 3, 2013
Int. Cl. B23K 1/00 (2006.01); B23K 35/36 (2006.01); B23K 35/362 (2006.01)
CPC B23K 1/0016 (2013.01) [B23K 35/3601 (2013.01); B23K 35/362 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A soldering method for joining objects, comprising the steps of:
generating a flux composition by:
combining, at approximately sixty degrees Celsius for at least approximately one hour, (i) about five percent by weight to about twenty percent by weight of an activator consisting of a mixture of 2-acetyloxybenzoic acid, acetyl butyric acid, levulinic acid, 2-acetylbenzoic acid, 2-ketobutyric acid, acetoxyacetic acid, and pyruvic acid, (ii) about fifteen percent by weight to about seventy-five percent by weight of a medium-viscosity solvent being a polymer in a liquid state, wherein the medium-viscosity solvent consists of a mixture of glycerol ethoxylate, glycerol propoxylate, and a glycerol ethoxylate-propoxylate copolymer, (iii) about twenty percent by weight to about eighty percent by weight of a high-viscosity solvent with hydroxyl end groups, wherein said 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, and wherein said high-viscosity solvent is in a liquid state at room temperature, and (iv) about four percent by weight to about ten percent by weight of multi-amines, wherein the multi-amines comprises tetrakis(4-hydroxyethyl)ethylenediamine;
applying the flux composition to at least a portion of one or more of the objects; and
joining the objects.