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.
Claims15
A recirculating water system comprising:
- (i) water,
- an adjuvant selected from the group consisting of dodecylamine and salt thereof,
- a polyquaternary ammonium compound comprising a repeat unit of the formula:
- wherein:
- R4, R5, R6 and R7 each independently is C1-6-alkyl optionally substituted by hydroxy;
- Q2− is a divalent counter ion, two monovalent counter ions or a fraction of a polyvalent counter ion sufficient to balance the cationic charge in the repeat unit;
- and
- a, b and t each independently is 1 to 4;
- and
- polymeric biguanide;
- and
- (ii) a means for recirculating (i);
- wherein the adjuvant, polyquaternary ammonium compound and polymeric biguanide are dissolved in the water and wherein the adjuvant, polyquaternary ammonium compound, and polymeric biguanide are present in an amount effective in inhibiting the growth of or killing algae, bacteria, and/or fungi in the recirculating water system without affecting water clarity.
A kit for treating recirculating water comprising
- (i) an adjuvant selected from the group consisting of dodecylamine and salt thereof,
- (ii) a polyquaternary ammonium compound comprising a repeat unit of the formula:
- wherein:
- R4, R5, R6 and R7 each independently is C1-6-alkyl optionally substituted by hydroxy;
- Q2− is a divalent counter ion, two monovalent counter ions or a fraction of a polyvalent counter ion sufficient to balance the cationic charge in the repeat unit;
- and
- a, b and t each independently is 1 to 4;
- (iii) a polymeric biguanide;
- and
- (iv) instructions for adding (i), (ii) and (iii) to a recirculating water system, the adjuvant, polyquaternary ammonium compound, and polymeric biguanide being present in an amount effective in inhibiting the growth of or killing algae, bacteria, and/or fungi, in a recirculating water system without affecting water clarity.
A composition comprising (i) an adjuvant selected from the group consisting of dodecylamine and salt thereof, (ii) a polyquaternary ammonium compound comprising a repeat unit of the formula:.
- wherein:
- R4, R5, R6 and R7 each independently is C1-6-alkyl optionally substituted by hydroxy;
- Q2− is a divalent counter ion, two monovalent counter ions or a fraction of a polyvalent counter ion sufficient to balance the cationic charge in the repeat unit;
- and
- a, b and t each independently is 1 to 4;
- and
- (iii) a polymeric biguanide, the adjuvant, polyquaternary ammonium compound, and polymeric biguanide being present in an amount effective in inhibiting the growth of or killing algae, bacteria, and/or fungi, in a recirculating water system without affecting water clarity.
Dependencies are inferred from the claim text.