Rohm and Haas Company

Kevin F Gironda

George H Redlich

Barry C Lange

Peter Osei-Gyimah

Ramesh B Petigara

Francis T Letterio

Dilute solutions of 0.5 to about 5% by weight of at least one 3-isothiazolone selected from the group consisting of 5-chloro-2-methyl-4-isothazolin-3-one and 2-methyl-4-isothazolin-3-one are stabilized without using inorganic metal salts or hydrogen peroxide by forming a microemulsion composition with organic solvent(s) having less than 6 percent by weight solubility in water; anionic surfactant(s); and optionally, non-ionic surfactant(s).

Stable microemulsions of certain 3-isothiazolone compounds

The present invention provides a method of stabilizing solutions of 3-isothiazolone compounds using a stabilizing compound of the formula: ##STR1## wherein R is C.sub.1 -C.sub.6 alkyl; and compositions which comprise 3-isothiazolone compound, solvent and stabilizing compound.

Stabilization of 3-isothiazolone solutions

The present invention provides an improved method of stabilizing of 3-isothiazolone solutions using bromate compounds by buffering the pH of the solution in the range of 4 to 5.1, and compositions which comprise 3-isothiazolone compound, bromate compound stabilizer, and sufficient buffer to maintain the pH in said range.

Bromate stabilization of nitrate-free 3-isothiazolones at pH 4-5.1

The present invention provides a method of stabilizing solutions of 3-isothiazolone compound(s) selected from the group consisting of 5-chloro-2-methyl-3-isothiazolone, 2-methyl-3-isothiazolone, and mixtures thereof in water free of nitrate or nitrite by the use of extremely low levels of copper ion, and compositions comprising water solutions of 3-isothiazolone compound(s) selected from the group consisting of 5-chloro-2-methyl-3-isothiazolone, 2-methyl-3-isothiazolone, and mixtures thereof, and extremely low levels copper ion.

Girondalones of the formula I useful as microbicides ##STR1## wherein A is a residue of a dialdehyde;

Girondalones

Method and device for protecting against chemical spills due to breakage of disk filters use to filter chemicals comprising (A) a base having an upper surface with at least one vial well or groove adapted to allow sample vials to be inserted and to support said vials during a filter operation, said base having a front vertical shield portion at least as high as the top of the sample vials when said vials are inserted; (B) a rack having a rear side with at least one slot, each of said slots adapted to slidably engage the disk filter portion of a filter syringe apparatus and to prevent said disk filter from bursting during a filter operation, each of said slots positioned in said rack so that when said rack is fit on said base, every male portion of every disk filter which is engaged in one of said slots fits in a corresponding sample vial inserted in the corresponding vial well or groove.

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Alpha, NJ, United States of America

Kevin F Gironda