Stable aqueous suspension concentrate for delivery of UV-labile water-insoluble biocides
A stable, aqueous suspension concentrate which includes a solid polymeric dispersant comprising one or more anionic polymeric dispersing agents, optionally a co-dispersant which preferably is a homopolymer and/or a copolymer of a heterocyclic vinyl lactam, preferably in a wt. ratio of 0.1:1 to 1:0.1, a UV-labile, water-insoluble biocide active, and a UV-blocker or UV-absorber to stabilize said active upon storage and/or exposure to sunlight or UV radiation.
1 . A stable, aqueous suspension concentrate which includes a solid polymeric dispersant comprising one or more anionic polymeric dispersing agents, a UV-labile, water-insoluble biocide active and a UV-blocker or UV-absorber to stabilize said active upon storage and/or exposure to sunlight or UV radiation.
2 . A stable, aqueous suspension concentrate according to claim 1 wherein said solid polymeric dispersant further comprises a co-dispersant.
3 . A stable, aqueous suspension concentrate according to claim 2 wherein said co-dispersant is a homopolymer and/or copolymer of a heterocyclic vinyl lactam.
4 . A stable, aqueous suspension concentrate according to claim 2 wherein said anionic polymeric dispersing agent and said co-dispersant are present in a wt. ratio of 0.1:1 to 1:0.1.
5 . A stable, aqueous suspension concentrate according to claim 1 wherein said anionic polymeric dispersing agent is selected from the group consisting of a sodium salt of alkyl vinyl ether/maleic acid half ester copolymer, a lignosulfonate or metal salt thereof, a sulfonated naphthalene/formaldehyde condensate, an alpha-olefin/maleic acid copolymer, a polyacrylate and mixtures thereof.
6 . A stable, aqueous suspension concentrate according to claim 1 wherein said biocide is a fungicide.
7 . A stable, aqueous suspension concentrate according to claim 6 wherein said biocide is a preservative.
8 . A stable, aqueous suspension concentrate according to claim 6 wherein said fungicide is a halopropargyl compound, an isothiazolone, a triazole, a phthalimide, a benzimidazole carbamate or tetrachloroisophalonitrile.
9 . A stable, aqueous suspension concentrate according to claim 1 wherein said biocide active is iodopropargyl butyl carbamate.
10 . A stable aqueous suspension concentrate according to claim 7 wherein the said preservative is benzisothiazolone.
11 . A stable, aqueous suspension concentrate according to claim 1 wherein said UV-blocker is titanium dioxide, zinc oxide, a stilbene, a UV-blocking mineral, and mixtures thereof.
12 . A stable, aqueous suspension concentrate according to claim 2 wherein said co-dispersant comprises a homopolymer or copolymer of vinyl pyrrolidone and an ionic derivative of methyl vinyl ether-maleic acid half-ester.
13 . A stable, aqueous suspension concentrate according to claim 2 wherein said co-dispersant is a clay selected from naturally occurring silicates, atta clay, bentonite, diatomaceous earth and Montmorillonite.
14 . A stable, aqueous suspension concentrate according to claim 1 which exhibits essentially no degradation on storage at 50° C. for 30 days, and substantially no discoloration or yellowing on exposure to sunlight or UV-radiation.
15 . A composition including the concentrate of claim 1 .
16 . A paint composition including the concentrate of claim 1 .
17 . A personal care composition including the concentrate of claim 1 .
18 . An article comprising a substrate coated with the suspension concentrate of claim 1 .
19 . An article according to claim 18 wherein said substrate is wood.
20 . A stable, water dispersible solid comprising a solid polymeric dispersant comprising one or more anionic polymeric dispersing agents, a UV-labile, water-insoluble biocide active and a UV-blocker or UV-absorber to stabilize said active upon storage and/or exposure to sunlight or UV radiation.