Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Plastics & Elastomers Functions
- Technologies
- Product Families
- Composition
CARSTAB DLTDP is a thioester synergist that is particularly effective as a long-term heat aging stabilizer when used in conjunction with primary antioxidants. CARSTAB DLTDP is highly effective in polypropylene, ABS, and high density polyethylene. CARSTAB DLTDP is a nonvolatile stabilizer and offers low oral and dermal toxicity.
Features & Benefits
- Materials Features
Applications & Uses
- Markets
- Recommended Applications
CARSTAB DLTDP is especially recommended to protect high density polyethylene and ABS from oxidation in high temperature applications. CARSTAB DLTDP is also very effective in polypropylene and other polymers.
For applications requiring superior heat stability, a combination of a hindered phenolic antioxidant and CARSTAB DLTDP should be used. It has been found that a combination of three parts of CARSTAB DLTDP to one part of hindered phenolic antioxidant often provides optimum performance. Typical use levels are 0.15% of CARSTAB DLTDP and 0.05% of phenolic antioxidant. It is recommended that specific end use formulations be optimized with regard to thioester synergist ratio and use level.
Properties
- Physical Form
- CLTE - Transverse (-22 to 86°F)
- White pastille
- Appearance
- White Pastille
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Acetone Solubility at 25°C | 55.0 | g/100 grams | - |
| Acid Value | 0.5 | mg KOH/g | - |
| Color (% Transmission at 440 mu) | 95.0 | - | - |
| Empirical Formula | C30H58O4S | - | - |
| Ethanol Solubility at 25°C | 4.0 | g/100 grams | - |
| Ethyl Acetate Solubility at 25°C | 60.0 | g/100 grams | - |
| Freezing Point | 40.0 | °C | - |
| Heptane Solubility at 25°C | 52.0 | g/100 grams | - |
| Molecular Weight | 514.0 | Da | - |
| Specific Gravity at 80°C | 0.896 | - | - |
| Toluene Solubility at 25°C | 65.0 | g/100 grams | - |
| Water Solubility at 25°C | Insoluble | g/100 grams | - |
Regulatory & Compliance
- Certifications & Compliance
- Regulatory Status
According to Section 182.3280 of the regulations to the Food Additives Amendment to the Federal Food, Drug and Cosmetic Act, dilaurylthiodipropionate is a substance that is generally recognized as safe when used as an antioxidant in edible fats and oils, provided the total concentration of all antioxidants present does not exceed 0.02 percent. In Section 181.24 of the regulations, dilaurylthiodipropionate is designated as a substance to which a prior sanction has been granted in the manufacture 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. CARSTAB DLTDP is also authorized for use in Section 175.300 as a component of resins or polymeric coatings.
Technical Details & Test Data
- Thermal Stability
CARSTAB DLTDP has been processed at temperatures as high as 600°F without excessive color formation or loss of stabilizer. CARSTAB DLTDP is thermally stable and little decomposition occurs after heating at 550°F for extended periods of time. The resistance of CARSTAB DLTDP to discoloration and volatilization is important as temperatures in this range are being encountered in modern plastic processing.
- Reactivity
The mechanism of oxidative polymer degradation is a radical chain process. The degradation process is initiated by the formation of a polymer free radical. This radical can be formed by the homolytic rupture of a chemical bond in the polymer. The initiation can be catalyzed by a variety of factors, such as ultraviolet radiation, ionizing radiation, heat and mechanical processing. Once the polymer radical has formed, it can react with oxygen to form a variety of oxygenated radical species. Initially, many of these species can propagate the decomposition process by yielding a radical which decomposes and by doing so can either cause oxidative chain scission or cross-linking.
The function of antioxidants is to inhibit the formation of the radical species. Hindered phenolic antioxidants are usually considered as chain terminators. Thioester synergists are believed to function in a variety of ways: as hydroperoxide or peroxide decomposers and as a means of regenerating the primary antioxidant.
The term “synergist” is applied to CARSTAB DLTDP because when it is used in combination with a hindered phenolic antioxidant, the stability is much greater than the sum of the individual components.
CARSTAB DLTDP is a relatively inert plastic additive and does not react with most commonly used plastic additives.
- Compatibility
Compatibility of plastic additives implies good solubility, non migration to the surface and permanence under conditions of use. Generally hindered phenolic antioxidants are quite compatible in polypropylene at their normal use levels, e.g., 0.02 to 0.3%. Thioesters differ in this respect with CARSTAB DLTDP approaching the limits of compatibility at levels above 1.4%.
Packaging & Availability
- Country Availability
- Regional Availability
Storage & Handling
- Shelf Life
- 24 Months
- Storage and Packaging
Storage Stability :
At least 2 years under normal storage conditions
Packaging :
PE lined 15 gallon fiber drums of 50 pounds net each