| abstract |
There is provided a polyamine flux composition comprising as an original component a polyamine flux represented by the formula I wherein R 1 , R 2 , R 3 and R 4 are independently selected from hydrogen, a substituted C 1-80 alkyl group, an unsubstituted C 1-80 alkyl group, a substituted C 7-80 arylalkyl group and an unsubstituted C 7 -80 arylalkyl group are selected, wherein R 7 comprises at least two tertiary carbon atoms, and from an unsubstituted C 5-80 alkyl group, a substituted C 5-80 alkyl group, an unsubstituted C 12-80 arylalkyl group and a substituted C 12-80 -Arylalkylgruppe is selected, and wherein the two nitrogen atoms shown in the formula I are each separately bound to one of the at least two tertiary carbon atoms of R 7 , with the proviso that when the polyamine flux of the formula I by the formula Ia is zero to three of R 1 , R 2 , R 3 and R 4 is hydrogen (are). There is also provided a method of soldering an electrical contact using the polyamine flux composition. |