The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1994
Filed:
Mar. 26, 1993
Michael L Bixenman, Old Hickory, TN (US);
George C Wolf, Kokomo, IN (US);
Kyzen Corporation, Nashville, TN (US);
Delco Electronics Corporation, Kokomo, IN (US);
Abstract
A method for removing flux residue from an electronic component using a solution having tetrahydrofurfuryl alcohol (THFA) and an activator. As activators, compounds of the formula ##STR1## are used, wherein R.sub.1, R.sub.2 and R.sub.3 are independently hydrogen, C.sub.1 -C.sub.7 alkyl, C.sub.5 -C.sub.6 cycloalkyl, furanyl which can be substituted by C.sub.1 -C.sub.7 alkyl, tetrahydrofuranyl which can be substituted by C.sub.1 -C.sub.7 alkyl, pyrrolyl, pyrrolidinyl, benzyl which can be substituted by C.sub.1 -C.sub.7 alkyl, phenyl which can be substituted by C.sub.1 -C.sub.7 alkyl, C.sub.1 -C.sub.7 alkenyl, C.sub.1 -C.sub.7 alkenyl, furfuryl which can be substituted by C.sub.1 -C.sub.7 alkyl, or tetrahydrofurfuryl which can be substituted by C.sub.1 -C.sub.7 alkyl, wherein R.sub.1, R.sub.2 and R.sub.3 can be hydroxy groups, where R.sub.1, R.sub.2 and R.sub.3 are not simultaneously hydrogen, R.sub.4 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.6 cycloalkyl, furanyl which can be substituted by C.sub.1 -C.sub.6 alkyl, tetrahydrofuranyl which can be substituted by C.sub.1 -C.sub.6 alkyl, pyrrolyl, pyrrolidinyl, or benzyl which can be substituted by C.sub.1 -C.sub.6 alkyl, R.sub.5 is C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.6 cycloalkyl, furanyl which can be substituted by C.sub.1 -C.sub.6 alkyl, tetrahydrofuranyl which can be substituted by C.sub.1 -C.sub.6 alkyl, furfuryl which can be substituted by C.sub.1 -C.sub.6 alkyl, tetrahydrofurfuryl which can be substituted by C.sub.1 -C.sub.6 alkyl, pyrrolyl, pyrrolidinyl, benzyl which can be substituted by C.sub.1 -C.sub.6 alkyl, or the group --(C).sub.1 --O--(C).sub.b --O--(C).sub.b --OH wherein a is from 1 to 3 and b is from 1 to 4, can be used. In addition to the activators (I) or (II), the present invention can also include as activators cyclic or non-cyclic diamines, pyrrolidone, optionally substituted by C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkenyl, or butyrolactone.