Claims
- 1. A method of preparing a liquid formulation of 1,2-benzisothiazolin-3-one comprising the steps of:
- (a) combining 1,2-benzisothiazolin-3-one with at least one polyglycol triol having the formula: ##STR4## wherein nx, ny and nz are individually selected from the group consisting of 2 and 3, and, when nx, ny and nz are each equal to 2, X+Y+Z has a value equal to or less than about 13.2, and, when nx, ny and nz are each equal to 3, X+Y+Z has a value equal to or less than about 4.45;
- (b) adding NaOH and water to the combination of step (a); and
- (c) agitating the combination of step (b) for a period of time sufficient to homogenize the combination;
- wherein the mixture of step (c) contains from about 1 to 25 percent by weight of 1,2-benzisothiazolin-3-one, about 3 to 7 percent by weight of sodium hydroxide, about 20 to 65 percent by weight of the at least one polyglycol triol and about 3 to 63 percent by weight of water.
- 2. The method of claim 1 wherein during the agitation of step (c) the combination is heated to a temperature of about 50.degree. C.
- 3. The method of claim 2 wherein the combination is heated for about one-half hour.
- 4. The method of claim 1 further comprising the step of adding a co-solvent at any step.
- 5. The method of claim 4 wherein the co-solvent is selected from the group consisting of a glycerol propoxylate having an average molecular weight greater than about 250 and less than about 750, propylene glycol, dipropylene glycol, dipropylene glycol methyl ether, 2-methyl-1,3-propanediol and polyethylene glycol having an average molecular weight greater than about 400.
- 6. The method of claim 1 wherein nx, ny and nz each equal 3.
- 7. The method of claim 6 wherein X+Y+Z is in the range of about 2.72 to 3.00.
- 8. The method of claim 1 where the reaction mixture of step (c) is filtered.
- 9. The method of claim 1 where the NaOH is in the form of a 50% aqueous solution.
- 10. The method of claim 1 where the homogenized solution contains by weight percent about 19.3% 1,2-benzisothiazolin-3-one, 6% sodium hydroxide, 19.7% water and 55% glycerol propoxylate having a number average molecular weight in the range of from 250 to 266.
- 11. A method of preparing a liquid biocide formulation having a VOC of less than about 5% that is stable during storage at temperatures of 0.degree. C. and below that comprises the steps of:
- (a) mixing about 19 parts by weight of dry 1,2-benzisothiazolin-3-one with about 55 parts by weight of a polyglycol triol selected from the group consisting of glycerol propoxylate, glycerol ethoxylate, and mixtures thereof;
- (b) adding to the mixture of step (a) about 12 parts by weight of 50% sodium hydroxide and about 13 parts by weight of water;
- (c) heating the reaction mixture of step (b) to at least 50.degree. C;
- (d) stirring the heated reaction mixture for a period of time sufficient to form an homogenized composition; and thereafter
- (e) filtering the composition of step (d).
- 12. The biocidal formulation of claim 11 where the polyglycol triol is glycerol propoxylate having a number average molecular weight in the range of from about 250 to about 750.
Parent Case Info
This is a divisional of application Ser. No. 08/505,013 filed on Jul. 21, 1995 now U.S. Pat. No. 5,585,033.
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Divisions (1)
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Number |
Date |
Country |
Parent |
505013 |
Jul 1995 |
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