There are described diquaternary ammonium compounds of the general formula:
##STR1##
wherein
R.sub.1 and R.sub.4 are each independently of the other C.sub.4 -C.sub.16
alkyl, phenyl or phenyl-C.sub.1 -C.sub.10 alkyl,
R.sub.2, R.sub.3, R.sub.5 and R.sub.6 are each independently of the others
C.sub.1 -C.sub.4 alkyl, and
A is a monovalent anion. The compounds exhibit a pronounced action against
gram-positive and gram-negative bacteria, and also against yeast, molds
and algae. They are accordingly suitable for the antimicrobial treatment
of surfaces and for the preservation and disinfection of materials and
cosmetic products, and especially also for the preparation of solid or
liquid formulations and for the preservation of foodstuffs and drinks. The
compounds are furthermore suitable for imparting antimicrobial properties
to technical plant and for antimicrobial water treatment.
