Patent ID: 7543592
Filing Date: 2009-06-09
Classification: C11D,G03F,H01L,H05K

Abstract:
1. A method for removing polymer, etch residue, ash residue, or a combination thereof from a wafer-level packaging substrate, from a printed circuit board, or both, on which a circuit, or a portion of a circuit, is present, which method comprises contacting the wafer-level packaging substrate, the printed circuit board, or both, with a composition, at a temperature and for a time sufficient to remove the polymer, the etch residue, the ash residue, or the combination thereof from the wafer-level packaging substrate, the printed circuit board, or both, while maintaining the operability of the circuit, or portion thereof, associated therewith, wherein the composition comprises (A) an organic ammonium compound having the formula  wherein: (B) an oxoammonium compound having the formula wherein: (C) water; and (D) an organic polar solvent that is miscible with water,