Biocidal compositions and use thereof containing a synergistic mixture of glutaraldehyde and dodecylguanidine hydrochloride

DETAILED DESCRIPTION OF THE INVENTION Surprisingly, the present inventors have found that mixtures the growth of bacterial microbes, specifically the Klebsiella pneumoniae species.
This particular species is a member of the capsulated, facultative class of bacteria and is generally present in air, water and soil.
These bacteria continually contaminate open cooling systems and pulping and papermaking systems and are among the most common slime formers.
The slime may be viewed as being a mass of agglomerated cells stuck together by the cementing action of the gelatinous polysaccharide or proteinaceous secretions around each cell.
The slimy mass entraps other debris, restricts water flow and heat transfer, and may serve as a site for corrosion.
The fact that the Klebsiella species used in the tests is a facultative species is important as, by definition, such bacteria may thrive under either aerobic or anaerobic conditions.
Accordingly, by reason of demonstrated efficacy in the growth inhibition of this particular species, one can expect similar growth inhibition attributes when other aerobic or anaerobic bacterial species are encountered.
It is also expected that these compositions will exhibit similar growth inhibition attributes when fungi and algae species are encountered.
As noted above, glutaraldehyde is available from Union Carbide Corp.
, and is sold under the trademarks "Ucarcide 225" or "Ucarcide 250".
The physical properties of these compounds are reported as being:
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Ucarcide 225
Ucarcide 250
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Specific Gravity at 20.
degree.
C.

1.
062 1.
124
Vapor Pressure at 20.
degree.
C.

17 mm.
Hg 17 mm.
Hg
Freezing Point -7.
0.
degree.
C.

-14.
0.
degree.
C.

Solubility in Water at 20.
degree.
C.

Complete Complete
Viscosity at
0.
degree.
C.
8.
4 cps 105