Combinations of Alkylalkanolamines and Alkylbisalkanolamines for Antimicrobial Compositions
An antimicrobial composition includes an effective amount of a biocide, and a biocide enhancer consisting of one or more compounds according to formula (I) and one or more compounds according to formula (II): R 1 —NH—CH 2 CHR 3 OH (I) R 2 —NH(CH 2 CHR 4 OH) 2 (II) wherein R 1 and R 2 are each individually selected from the group consisting of branched and linear C4 to C16 alkyl groups and wherein R 3 and R 4 are each individually H or methyl. Compositions incorporating these antimicrobial formulations may include treated fluids, for example organic fluids or mixtures of organic fluids and aqueous fluids. Such treated compositions may be used for metalworking or for any of a number of other applications.
1 . A composition comprising an effective amount of a biocide and a biocide enhancer, said enhancer consisting of one or more compounds according to formula (I) and one or more compounds according to formula (II):
R 1 —NH—CH 2 CHR 3 OH (I)
R 2 —NH(CH 2 CHR 4 OH) 2 (II)
wherein R 1 and R 2 are each individually selected from the group consisting of branched and linear C4 to C16 alkyl groups and wherein R 3 and R 4 are each individually H or methyl.
2 . The composition of claim 1 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 1 and R 2 are the same.
3 . The composition of claim 1 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 1 and R 2 are both 1-butyl.
4 . The composition of claim 1 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 1 and R 2 are both 1-octyl.
5 . The composition of claim 1 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 3 and R 4 are the same.
6 . The composition of any claim 1 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 3 and R 4 are both hydrogen.
7 . The composition of claim 1 , wherein the one or more compounds according to formula (I) constitute from 5 to 95 wt % of the biocide enhancer and the one or more compounds according to formula (II) correspondingly constitute from 95 to 5 wt % of the biocide enhancer.
8 . The composition of claim 1 , wherein the biocide comprises an isothiazolinone.
9 . The composition of claim 1 , wherein the biocide enhancer and the biocide together constitute a first component, the composition further comprising a second component, said second component comprising a water-immiscible liquid organic material.
10 . The composition of claim 9 , wherein the composition further comprises water.
11 . The composition of claim 9 , wherein the liquid organic material is selected from the group consisting of hydrocarbon refinery oils, esters, synthetic hydrocarbon lubricants, polyalkyleneglycols, perfluoro compounds, alkylated phenol ethers, and biodiesel oils.
12 . The composition of claim 9 , wherein the composition comprises a water-in-oil emulsion or an oil-in-water emulsion.
13 . The composition of claim 9 , wherein the second component constitutes from 5 to 95 wt % of the composition and water constitutes from 95 to 5 wt % of the composition.
14 . The composition of claim 9 , wherein the composition is a metalworking fluid.
15 . The composition of claim 9 , wherein the pH of the composition is from 7 to 11.
16 . The composition of claim 9 , wherein the pH of the composition is from 8 to 10.
17 . The composition of claim 9 , wherein the biocide enhancer constitutes from 100 to 50,000 ppm by weight of the composition.
18 . The composition of claim 9 , wherein the biocide constitutes less than 100 ppm by weight of the composition.
19 . A method of inhibiting or preventing biological growth in a composition, the method comprising adding to the composition an effective amount of a biocide and a biocide enhancer, said enhancer consisting of one or more compounds according to formula (I) and one or more compounds according to formula (II):
R 1 —NH—CH 2 CHR 3 OH (I)
R 2 —NH(CH 2 CHR 4 OH) 2 (II)
wherein the one or more compounds according to formula (I) constitute from 5 to 95 wt % of the biocide enhancer and the one or more compounds according to formula (II) correspondingly constitute from 95 to 5 wt % of the biocide enhancer; wherein R 1 and R 2 are each individually selected from the group consisting of branched and linear C4 to C16 alkyl groups and wherein R 3 and R 4 are each individually H or methyl.
20 . The method of claim 19 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 1 and R 2 are the same.
21 . The method of claim 19 , wherein the one or more compounds according to formula (I) and the one or more compounds according to formula (II) comprise compounds in which R 3 and R 4 are both hydrogen.
22 . The method of claim 19 , wherein the composition comprises water and a water-immiscible liquid organic material.
23 . The method of claim 19 , wherein the composition is a metalworking fluid.
24 . The method of claim 22 , wherein the composition comprises more liquid organic material by weight than water, and wherein the one or more compounds of formula (I) constitute more than 50% by weight of the biocide enhancer.
25 . The method of claim 22 , wherein the composition comprises more water organic by weight than liquid organic material, and wherein the one or more compounds of formula (II) constitute more than 50% by weight of the biocide enhancer.