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AssigneesKyzen Corporation, Delco Electronics Corporation
InventorsMichael L. Bixenman, George C. Wolf
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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.
A process for removing flux residue from an electronic component comprising contacting the component with a solution of an effective amount to remove said flux residue of a composition at a temperature below the boiling point of the composition without harming the component, said composition comprising tetrahydrofurfuryl alcohol and an activator of the formula ##STR9## 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, C.sub.1 -C.sub.7 alkenyl, C.sub.1 -C.sub.7 alkynl, 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 substituted by at least one hydroxy group, provided that R.sub.1, R.sub.2 and R.sub.3 are not simultaneously hydrogen, or ##STR10## wherein 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, furanyl, 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
A flux removing agent for removing flux residue from an electronic component, said agent being effective for use at standard temperature and pressure conditions, at a temperature below the boiling point of the agent without harming the component comprising a flux removing effective amount of tetrahydrofurfuryl alcohol and an activator, said activator being pyrrolidone which can be substituted by C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkenyl, or butyrolactone.
Dependencies are inferred from the claim text.