Non-azeotropic solvent composition for cleaning and defluxing electrical assemblies
AssigneeMotorola, Inc.
InventorsRobert C. Pfahl, Jr., James A. Wrezel, Lawrence R. Hagner
Life of this patent
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Abstract
A distillable, non-azeotropic solvent mixture for electronic assembly cleaning in order to adequately remove solder flux and other residues traditionally removed using CFC-based azeotropes. The mixture is heated to at least the boiling point of component A but less than the boiling point of component B. Component A vaporizes (102), forming a vapor layer above the mixture (103). Condensing elements (101) near the top of the cleaning apparatus condense the vapor (102), returning it to the heated mixture (103) to be vaporized again. The assembly (104) to be cleaned is lowered through the vapor and then immersed in the mixture (103) before being positioned in the vapor (102).
Claims13
A non-azeotropic solvent composition for cleaning and defluxing electrical assemblies, the composition comprising:
- a first element comprised of from 5 to 95 parts by weight of a distillable halogenated alcohol comprising from two to four carbon atoms;
- and
- a second element comprised of from 5 to 95 parts by weight of a monocyclic terpene, wherein vapors from the halogented alcohol form a vapor barrier over the monocyclic terpene.
A non-azeotropic solvent composition for cleaning and defluxing printed circuit boards, the composition comprising:
- a first element comprised of from 5 to 95 parts by weight of a distillable non-halogenated alcohol comprising from two to four carbon atoms;
- and
- a second element comprised of from 5 to 95 parts by weight of a monocyclic terpene, wherein vapors from the alcohol form a vapor barrier over the monocyclic terpene.
A non-azeotropic solvent composition for cleaning and defluxing printed circuit boards, the composition comprising:
- a first element comprised of from 5 to 95 parts by weight of a distillable halogenated or non-halogenated alcohol containing from two to four carbon atoms;
- and
- a second element comprised of from 5 to 95 parts by weight of a bicyclic terpene, wherein vapors from the alcohol form a vapor barrier over the bicyclic terpene.
A non-azeotropic solvent composition for cleaning and defluxing printed circuit boards, the composition comprising:
- a first element comprised of from 5 to 95 parts by weight of a distillable halogenated or non-halogenated alcohol containing from two to four carbon atoms;
- and
- a second element comprised of from 5 to 95 parts by weight of a terpene alcohol, wherein vapors from the alcohol form a vapor barrier over the terpene alcohol.
Dependencies are inferred from the claim text.