STABLE, LOW VOC, LOW VISCOUS BIOCIDAL FORMULATIONS AND METHOD OF MAKING SUCH FORMULATIONS
A stable, low VOC, low viscosity biocide formulation comprising an effective amount of at least one biocide, 1,2-benzisothiazolin-3-one (BIT), and a polyglycol liquid carrier of formula (I): R—O-(AO) n —O—R1, wherein n is 4-25, R and R′ are hydrogen, C 1 -C 3 alkyl groups, O═C—CH 3 group, or O═C—C 2 H 5 group, and AO is a) CH 2 CH 2 O, or b) CH 2 CH 2 O/CH 2 CHMe-O block or random copolymer; with proviso that when R and R′ are both hydrogen, AO is a block or random copolymer. A method of making such a formulation.
1 . A formulation comprising 1,2-benzisothiazolin-3-one (BIT), and a polyglycol liquid carrier of formula (I):
R—O-(AO) n —R′
wherein
n is 4-25;
R and R′ are independently hydrogen, C 1 -C 3 alkyl groups, O═C—CH 3 group, or O═C—C 2 H 5 group; and
AO is a) CH 2 CH 2 O, or b) CH 2 CH 2 O/CH 2 CHMe-O block or random copolymer;
with proviso that when R and R′ are both hydrogen, AO is a block or random copolymer.
2 . The formulation according claims 1 , wherein the block or random copolymer comprises more than 50 wt. % of CH 2 CH 2 O.
3 . The formulation according to claim 1 , wherein n is 5-20.
4 . The formulation according to claim 1 , wherein n is 6-15.
5 . The formulation according to claim 1 further comprising alkali metal hydroxide and/or water.
6 . The formulation according to claim 1 comprising:
about 0.1 to 30 wt. % of BIT,
about 10 to 80 wt. % of polyglycol of formula (I),
less than 5 wt. % of alkali metal hydroxide, and
less than 30 wt. % of water.
7 . The formulation according to claim 1 wherein the liquid carrier is Me-O—(CH2CH2O) 6 —H.
8 . The formulation according to claim 7 comprising:
about 15 to 25 wt. % of BIT,
about 50 to 60 wt. % of Me-O—(CH2CH2O) 6 —H,
about 3 to 4 wt. % of NaOH, and
about 15-25% of water.
9 . The formulation according to claim 1 wherein the liquid carrier is MeO—(CH 2 CH 2 O) 6 —COCH 3 .
10 . The formulation according to claim 1 wherein in the liquid carrier of formula (I):
n is 5-10,
R is propyl and R′ is hydrogen, and
AO is CH 2 CH 2 O.
11 . The formulation according to claim 1 wherein in the liquid carrier of formula (I):
n is 5-10,
R and R′ are both propyl groups, and
AO is CH 2 CH 2 O.
12 . The formulation according to claim 1 comprising more than one biocide.
13 . The formulation according to claim 1 further comprising one or more additional biocides selected from bronopol, methylisothiazolinone (MIT), chloromethylisothiazolinone (CMIT), glutaraldehyde, orthophenylphenol, bromine containing biocides, or formaldehyde releasers such as N- and O-formals, and mixtures of two or more of these biocides.
14 . The formulation according to claim 1 , wherein the pH of the formulation is between 1 to 10.
15 . (canceled)
16 . The formulation according to claim 1 , wherein the viscosity of the formulation is between about 20 to 200 mm 2 /second at 25° C.
17 . (canceled)
18 . (canceled)
19 . The formulation according to claim 1 comprising less than 10 weight % of volatile organic carbons.
20 . (canceled)
21 . (canceled)
22 . A method of making the formulation of claim 1 , the method comprising:
adding the biocide to the polyglycol to form a mixture, and
stirring the mixture of biocide and polyglycol.
23 - 29 . (canceled)
30 . A method of inhibiting the growth of microorganisms in an aqueous-based system, the method comprising adding to said system an effective amount of a formulation according to claim 1 .
31 . A method according to claim 30 wherein the aqueous based system is selected from latexes, paint formulations, coatings, mineral slurries, cosmetics, household or personal care formulations, metal working fluids, and pulp and paper mill samples.
32 . A formulation according to claim 1 wherein the liquid carrier is Me-O—(CH2CH2O) 16 —H.