Stable matrix emulsion concentrates and stable aqueous and/or organic solvent compositions containing biocides

1. A stable microemulsion concentrate comprising, by weight,

(a) 1-40% of a biocide selected from iodopropargyl butyl carbamate, or the combination of iodopropargyl butyl carbamate and propiconazole,

(b) a matrix of:

(i) 0-30% of a C 1 -C 4 N-alkyl pyrrolidone,

(ii) 0.5-30% of a C 8 -C 14 N-alkyl pyrrolidone,

(iii) 4-85% of castor oil ethoxylate,

(iv) 0.5-20% of an ethylene oxide/propylene oxide copolymer, and

(v) 0.05-5% of an ethoxylated phosphate ester, and

(c) an organic solvent as diluent wherein said organic solvent is propylene carbonate.

2. A stable microemulsion concentrate according to claim 1 wherein (c) is present in an amount of 10-60% by weight of the diluted concentrate.

3. A stable microemulsion concentrate according to claim 2 wherein (a) is about 15-30%.

4. A stable microemulsion concentrate according to claim 1 wherein (b) (ii) is about 10-20%.

5. A stable microemulsion concentrate according to claim 1 wherein (b) (iii) contains 30 EO units; and (b) (v) contains 9-10 EO units.

6. A concentrate according to claim 1 which includes a quat.

7. A stable microemulsion composition including the microemulsion concentrate of claim 1 and water and/or an organic solvent of dilution.

8. A stable aqueous microemulsion composition according to claim 7 which is diluted with water and/or organic solvent at a concentration of 1 part of emulsion concentrate to 20-1000 parts of water and/or organic solvent of dilution.

9. A composition of claim 7 which includes about 100-5000 ppm of biocide.

10. A composition according to claim 7 which also includes a quat.