Cleaning compositions comprising dichlorotrifluoroethanes and alkanols
AssigneeKalie-Chemie AG
InventorsHans Buchwald, Andreas Brackmann, Boleslaus Raschkowski
Life of this patent
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Abstract
Compositions composed of fluorochlorohydrocarbons selected from the group consisting of the dichlorotrifluoroethanes in admixture with lower alkanols. The compositions are especially suitable for use as cleaning compositions, particularly for removing organic resin fluxes or flux residues from printed circuit boards.
Claims15
A composition of matter which consists essentially of an azeotrope-like binary solvent mixture having a boiling point range of from 27.degree. C. to 31.degree. C. at atmospheric pressure and consisting essentially of from 99.5% to 98.0% by weight 1,1-dichloro-2,2,2-trifluoroethane (=R 123) and from 0.5% to 2.0% by weight ethanol, the total of the constituents being 100% by weight.
A composition of matter consisting essentially of:
- 100 parts by weight of a binary solvent mixture which is an azeotropic-like composition having a boiling point in the range from 27.degree. C. to 31.degree. C. at atmospheric pressure and consisting essentially of from 99.5 to 98 parts by weight of 1,1-dichloro-2,2,2-trifluoroethane (=R 123) and from 0.5 to 2 parts by weight ethanol, for a total of 100 parts by weight;
- and optionally
- from 0 to 5 parts by weight of additives selected from the group consisting of stabilizers, corrosion inhibitors, non-ionic or ionic emulsifiers, and dyestuffs.
A composition of matter which consists essentially of an azeotrope-like binary solvent mixture having a boiling point range of from 27.5.degree. to 32.degree. C. at atmospheric pressure and consisting essentially of 99.5% to 98.0% by weight 1,1-dichloro-2,2,2-trifluoroethane (=R 123) and 0.5% to 2.0% by weight isopropanol.
A composition of matter consisting essentially of:
- 100 parts by weight of a binary solvent mixture which is an azeotropic-like composition having a boiling point range of from 27.5.degree. C. to 32.degree. C. at atmospheric pressure and consisting essentially of from 99.5 to 98 parts by weight 1,1-dichloro-2,2,2-trifluoroethane (=R 123) and from 0.5 to 2 parts by weight isopropanol, for a total of 100 parts by weight;
- and optionally
- from 0 to 5 parts by weight of additives selected from the group consisting of stabilizers, corrosion inhibitors, non-ionic or ionic emulsifiers, and dyestuffs.
A method of cleaning comprising contacting an article to be cleaned with a composition consisting essentially of:
- 100 parts by weight of an azeotropic-like binary solvent mixture having a boiling point range of from 27.degree. C. to 32.degree. C. at atmospheric pressure and consisting essentially of:
- from 99.5 to 96.5 parts by weight of dichlorotrifluoroethane, and
- from 0.5 to 3.5 parts by weight of ethanol or isopropanol;
- and optionally
- from 0 to 5 parts by weight of additives selected from the group consisting of stabilizers, corrosion inhibitors, non-ionic or ionic emulsifiers, and dyestuffs;
- wherein the article to be cleaned is a printed circuit board contaminated with soldering flux or soldering flux residues.
Dependencies are inferred from the claim text.