Phenol-Free Stabilizers

Phenol-free stabilization system, gas fade resistant 

Phenol-free process/light-stabilizer, low color, gas fade resistant 

Light-stabilizer system, phenol-free process stabilizer 

---

Accordingly, Ciba Specialty Chemicals developed a new phenol-free stabilizer for fiber, designated Irgastab FS 533. To properly evaluate the product for gas fading, Qba knitted... 

Yu I, et al. A new phenol-free stabilizer solution for polypropylene fiber. International Polyolefins Conference, conference proceedings. Society of Plastics Engineers 2008. 

For color-critical applications requiring phenol-free stabilization, synergistic mixtures of hindered amines (for both uv stability as well as long-term thermal... 

The above considerations suggest that phenol-free stabilizers should be introduced to exclude gas fading in specific applications. 

For color-critical applications requiring phenol-free stabilization synergistic mixtures of sterically hindered amines (HA (L)S) and a hydroxylamine-based stabilizer, used during melt processing, with or without an organophosphate or organo-phosphonite, can be used to avoid the undesired discoloration typically associated with the oxidation of the phenolic antioxidants into products with quinoid stmctures. ... 

The use of phenol-free stabilization systems has been found to be very effeaive in color-critical products such as PP and polyethylene fibers, as well as selected TPO applications. 

Instead of using cadmium, tin and lead, these stabilizer products present a nontoxic, haze-free, phenol free, heavy-metal-free alternative (Table 17). 

In polypropylene tape applications. HP-136 is very effective when used with a classic phenolic or in a ternary blend and. compared with a traditional binary blend, data indicate that there is potential for a 50% reduction in total stabilizer concentration, with comparable melt flow stability, improvement in colour, and an improvement in water carry-over, again providing a significant margin for optimization of formulation. In polypropylene fibre applications, a combination of HP-136 with a hindered amine and a phosphite shows melt flow and colour comparable with a traditional binary system, but superior gas-fade resistance and UV stability in phenol-free blends. This improvement is seen at 40% less concentration. 

Properties Transparent, Weather resistant. Low odor, Phenol-free, Limited self-lubrication. Very good initial color. Stabilizing E-PVC Viscosity at 20C (mPa.s) 70 Color Gardner max.)J 3 Density at 20C (g/cm3) 1.05... 

Fields Calendering, Extrusion, Rigid PVC Technical, Semi-rigid PVC Properties Transparent, Phenol-free, No self-lubrication. Very good initial color. Very good color hold. Very good long term stability... 

---