Organotin ingredient

The elastomers investigated were prepared by curing a silicone resin (supplied by Rhodia Silicones) containing a blend of ingredients polysiloxane-diols, small amounts of hydrogen-methyl polysiloxane, tetraalkoxy silane and fumed silica filler. An organotin ingredient, stannous 2-ethylhexanoate, supplied as a 77% w/w solution in 2-ethyl hexanoic acid, was used as a cure initiator. Typically, 5 wt. of initiator is mixed into the polysiloxane resin. After the initial cure, the material is post-cured at 70°C for 16 h in an air oven. 

The primary nutrient in flexible PVC is the plasticizer. Epoxidized natural oils arc easily metabolized by a variety of bacteria and fungi. In some cases, hquid epoxy resins can be substituted for, for example, ESO, improving microbial resistance. Since epoxy resins usually add tack, revision of the lubricant system may be required. In filled or pigmented compounds, it would be preferable to use an acid absorber such as hydrotalcite or zeolite in place of ESO, or a stabilizer system based on such ingredients. This is also possible in translucent compounds such as shower crrrtains. Polyol components of stabilizers, such as pentaerythritol, are also nutrients. As with rigid PVC/wood fiber composites, the ideal stabilizer would be a combination of organotin carboxylate and hydrotalcite or zeolite, hr many cases, the required material cost... 

BIOMET TBTO Antifoulant is an organotin compound, which will provide antifouling properties in marine paint formulations. Originally used solely in pleasure craft systems, BIOMET TBTO is now receiving wide acceptance in heavy marine systems as an adjunct to other antifouling ingredients. 

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