Antioxidants

EVANSTAB® Thiodipropionates are major derivatives of Thiodipropionic Acid and are used as secondary antioxidants in a variety of polymer systems including polyolefins, ABS, styrene-butadiene emulsions, and certain adhesives.
Key properties of synthetic resins such as polyethylene, polypropylene, ABS, and polystyrene must be protected against deterioration during fabrication of the polymer and during its use. Antioxidants such as EVANSTAB® thiodipropionates offer this protection.
Degradation of resins results from the formation of free radicals and hydroperoxides, which normally decompose to form additional free radicals. Primary antioxidants — usually substituted phenolic-type compounds— act as free radical scavengers to terminate the propagation of chain reactions that accelerate the oxidation process. Secondary antioxidants, such as thiodipropionates, break down hydroperoxides at twice the rate of phosphites. The transformation products are themselves more effective and synergize with phenolic antioxidants.

Thiodipropionates offer:
- Low volatility
- Excellent compatibility and performance
- Negligible color formation
- Increased color stability during aging
- Low order of toxicity with FDA approval for use in food and food packaging materials
- Strong synergism with primary antioxidants
- Improved melt stability during polymer fabrication
- Improved retention of physical and electrical properties during polymer fabrication and during
   environmental aging of the polymer.

FDA Status of EVANSTAB® Thiodipropionate Antioxidants:

Dilauryl Thiodipropionate and Thiodipropionic acid have been approved by the U.S. Food and Drug Administration (FDA) as antioxidants in food packaging materials and as preservatives in edible fats and oils when used in accor-dance with FDA Regulations 181.24, 182.3109, and 182.3280.
Under these conditions, the use of Dilauryl Thiodipropionate and Thiodipropionic acid in packaging materials is not considered a food additive by virtue of “prior sanction.” The restriction on use in this case is that the antioxidant may not migrate to food in an amount to exceed a concentration of 0.005 percent in the food. Thiodipropionic acid is approved as an antioxidant in polymers intended for food packaging under FDA regulation 178.2010.
It is available as flakes or pastilles.

The necessary data which the FDA requires for approving a food or food packaging additive has not been obtained for ditridecyl thiodipropionate.
Ditridecyl Thiodipropionate is a liquid product.

In Section 181.24 of the Food Additives regulations, Distearyl Thiodipropionate has been approved as an antioxidant in food packaging materials. Under these conditions, distearyl thiodipropionate is not considered a food additive by virtue of a “prior sanction” in the case of food packaging materials. The restriction on use in this case is that the antioxidant may not migrate to food in an amount to exceed a concentration of 0.005 percent in the food.
Distearyl Thiodipropionate is recognized as safe for use as an antioxidant in food, provided the total quantity of all antioxidants present does not exceed 0.02 percent based on the weight of the fat or oil content, including essential (volatile) oil content, of the food.
It is available as flakes or pastilles.

Lauryl/Stearyl Thiodipropionate also is used as antioxidant.
It is available as flakes or pastilles.

Others

Additionally we offer:


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