Metal treatment – Compositions – Fluxing
Patent
1990-12-27
1991-11-05
Rosenberg, Peter D.
Metal treatment
Compositions
Fluxing
148 24, 148 25, B23K 3534
Patent
active
050629026
ABSTRACT:
A residue-free fluxing process wherein the active fluxing agent comprises a .beta.-diketone or .beta.-ketoimine ligand. Such ligands react with surface metal oxides on workpieces to be soldered to form volatile metal-ligand complexes as reaction products which are sublimed from the surface leaving essentially no residue on the workpieces. The fluxing agents can be utilized in gas-phase processes wherein the workpieces are contacted with an effective amount of one or more ligands which are dispersed in a carrier gas or solvent or by incorporating the ligands into an alloy-vehicle mixture for use as conventional creams or pastes. The invention eliminates the need for post-reflow cleaning using solvents since no flux residue remains on the workpieces to be soldered following volitilization of the metal-ligand complex.
REFERENCES:
patent: 2801196 (1957-07-01), Doerr
patent: 3301688 (1967-01-01), Simpelaar
Air Products and Chemicals, Inc. Patent Application Docket No. 225PUSO4074 entitled "Fluxing Agents Comprising B-Diketone and B-Ketoimine Ligands and a Process for Using The Same".
Office Action dated Jun. 22, 1990 to Air Products and Chemicals, Inc. corresponding to Docket No. 225PUSO4074.
Amendment Under 37CFR1.111 and Response to Restriction Requirement Under 37CFR1.143 from Air Products and Chemicals, Inc. in response to the Office Action dated Jun. 22, 1990 corresponding to Docket No. 225PUSO4074.
Ellison Thomas L.
Ivankovits John C.
Norman John A. T.
Roberts David A.
Air Products and Chemicals Inc.
Gourley Keith D.
Marsh William F.
Rosenberg Peter D.
Simmons James C.
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