Treatment of circulating water systems
AssigneeArch Chemicals, Inc.
InventorsMichael Joseph Unhoch, Roy Dean Vore
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Abstract
The present invention relates to a method of inhibiting the growth of killing algae, bacteria, yeast and/or fungi in a recirculating water system which comprises adding to the water a polymeric biguanide and an adjuvant of the Formula (1) or a salt thereof; wherein: R1 is an optionally substituted C8 to C12 or C18 to C22 alkyl group; and R2 and R3 each independently is H or optionally substituted C1-4-alkyl. 1
Claims29
A method for inhibiting the growth of or killing microorganisms particularly, algae, bacteria, yeast, and/or fungi in a recirculating water system comprising adding to the water a polymeric biguanide and an adjuvant of the Formula (1) or a salt thereof:
- 13
- wherein:
- R1 is an optionally substituted C8 to C12 or C18 to C22 alkyl group;
- and
- R2 and R3 each independently is H or optionally substituted C1-4-alkyl.
A method according to any one of the preceding claims wherein the polymeric biguanide contains at least two biguanide units of Formula (2):
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- linked by a bridging group which contains at least one methylene group.
A method according to any one of the preceding claims wherein the polymeric biguanide is a mixture of polymer chains in which the individual polymer chains, excluding the terminating groups, are of the Formula (6) or a salt thereof:
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- wherein n is from 4 to 40.
A method according to any one of the preceding claims wherein the polymeric biguanide is in the hydrochloride salt form.
A method according to any one of the preceding claims wherein the polymeric biguanide is added to the re-circulating water system to give a concentration thereof in the water of from 1 to 20 ppm.
A method according to any one of the preceding claims wherein the polymeric biguanide and the adjuvant are added to the recirculating water system as a composition comprising the polymeric biguanide, the adjuvant and optionally a carrier.
A method according to any one of the preceding claims which further comprises adding one or more further antimicrobial compound(s).
A method according to any one of the preceding claims, wherein the recirculating water system is selected from swimming pool systems, spa systems, heating systems, cooling systems, cooling towers, domestic central heating systems, and ornamental ponds.
A method for inhibiting the growth of or killing algae microorganisms particularly, bacteria, yeast, and/or fungi in a recirculating water system comprising adding to the water in either order or simultaneously:
- (i) dodecylamine or a salt thereof;
- and
- (ii) a polymeric biguanide;
- wherein the dodecylamine is added to the water system to give a concentration thereof of from 0.1 to 24 ppm and the polymeric biguanide is added to the water system to give a concentration thereof of from 1 to 20 ppm.
A composition according to claim 25 which comprises:
- (a) from 5 to 30 weight % of the compound of Formula (1) as defined in claim 1 and 5 to 30 weight % polymeric biguanide;
- and
- (b) from 90 to 60 weight % carrier.
Dependencies are inferred from the claim text.