Wanted for destruction of valuable property—the teredo. He lives in salt water and he's dangerous. He attacks wood boats and pilings if they are not protected by M&T's new triorganotin compounds.
Justifiable biocide When bacteria, fungi, marine and terrestrial organisms harm people or property, they deserve to be killed. We can supply you with a weapon these creatures consider pretty ghastly. The weapon is a new class of triorganotin compounds that include bis(tri-n-butyltin) oxide, bis(tri-n-propyltin) oxide, and triphenyltins. bis(tri-n-butyltin) oxide. The first of these, bis(tri-n-butyltin) oxide, sold under the trade name bioMeT* TBTO* is now in use as a slime control agent for industrial cooling water and for closed systems in pulp and paper mills. Trademark TBTO is the active ingredient in wood preservatives and marine antifouling paints. It keeps textiles pure and prevents odors in plastics. Hospitals use TBTO for environmental control especially to combat highly infectious bacteria like Staphylococcus aureus.
bioMeT TBTO kills sulf ate-reducing bacteria. Sample at left contains 20 ppm TBTO and a quaternary ammonium compound. Untreated sample at right shows black iron sulfide due to presence of live bacteria. See text.
In the petroleum industry, bioMeT TBTO is controlling sulfate reducing bacteria in secondary oil recovery water. Here neither TBTO nor quater-
nary ammonium compounds by themselves are completely effective. Together, they solve the problem. The Sulfate Reducer Kill Test illustrates the powerful biocidal action of such mixtures. For example, using 1 part TBTO to 5 parts of alkyldimethylbenzylammonium chloride in a concentration of less than 20 ppm results in complete destruction of the bacteria. (See illustration below left.) TBTO keeps its biological activity for long periods of time. It stays active in alkaline solutions and dilute mineral acids at room temperatures. It remains stable up to 140°C for 30 minutes. Generally, TBTO suffers no deactivation by cationic, nonionic or anionic surfactants. bioMeT TBTO has a tremendous affinity for cellulose... one of the reasons why it is so effective in protecting wood in marine environments and in odor control on washable fabrics. Even under severe leaching conditions it continues to afford control. Its bacteriostatic and fungistatic properties suggest its incorporation in plastics and emulsion paints. We also have evidence that TBTO can be used to stop fungi that attack adhesives, leather, and wax. Use bioMeT TBTO formulations alone or in combination with mercurials, chlorinated phenols, organic sulfur compounds, and quaternary ammonium compounds. They offer a wide range of possible formulations to suit your application.
M&T Chemicals Inc. FORMERLY METAL&THERMIT CORPORATION
bis(tri-n-propyltin) oxide and triphenyltins. These newer organotin compounds, while not so widely tested as the butyltins, show promise in a number of areas. The propyltins, for example, appear to be excellent mildewcides in paints. Exposure tests with long oil alkyd paints in Southern Florida show that approximately 0.25% of tripropyltin completely inhibits fungus growth on this easily attacked paint
bis(tri-n-propyltin) oxide protects alkyd paint against fungus attack. Sample at left is control. Second panel from left contains tripropyltin. Two samples on right contain other protective agents. See text for details.
after exposures of 5 months. On the other hand, the same concentration of phenylmercuric oleate offers only partial protection. (See unretouched photo above.) M&T triphenyltin compounds are now being investigated for use as agricultural fungicides. We will be happy to supply you with additional data. In fact, if you have any kind of a problem requiring biocidal chemicals, write to us for information. Samples are available on request. Address inquiries to M&T Chemicals Inc., Commercial Development, 100 Park Avenue, New York. In Canada: M&T Products of Canada Ltd., Hamilton, Ont.
