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BASF

Light stabilizers and UV absorbers are designed to solve the polymers degradation issues caused by exposure to sunlight.

BASF has developed a comprehensive range of light stabilizers and UV absorbers to meet the requirements of various markets and applications (Agriculture, Automotive, Building & Construction and others).

HALS as HATS

While originally introduced as highly efficient light stabilizers, Sterically Hindered Amine (HAS) have also been found to be very efficient thermal stabilizers in polyolefins. As HAS work by scavenging both oxygen centered and carbon centered radicals [see Figure 1], , they should work independently from the initial radical source - UV radiation or thermal stress.

Figure 1: Cyclic process - HAS regeneration

The effect of HAS as thermal stabilizers was not initially realized because accelerated oven aging testing was done as close as possible to the melt temperature of the polymer in order to accelerate test results. The effect of HAS as thermal stabilizers is most evident when testing is done closer to actual use temperatures.
Figure 2 demonstrates the truly outstanding performance of HAS as HATS in polypropylene multifilaments, tested at 110°C

HATS in polypropylene

Figure 2: Oven aging of PP multifilaments. Fiber spinning at 240°C; 120/40dpf, round.
Base: 0.1% Irgafos 168 + 0.05% Ca-Stearate


Whereas the weathering resistance of polypropylene is more or less linear with concentration of HALS, the lifetime imparted by HATS apparently is a function of the square root of HATS concentration [Figure 3], at least in the 0.15% to 0.6% concentration range. The data clearly indicate that the long-term thermal stability of polypropylene fibers can be extended to about one year of continuous 110°C exposure using commercial HAS as HATS. Interestingly, Chimassorb® 944, which imparts such outstanding thermal protection to the multifilaments, is one of the more commonly used HALS for protecting multifilaments against the adverse effects of UV-induced degradation.

HATS concentration in PP

Figure 3: Oven aging time as a function of the HATS concentration in PP multifilaments.
All samples:0.20% Irganox® B 501 W 0.10% CaSt + 0.25% TiO2; 130/37 dtex PP multifilaments (d.r.= 1:5.8)

Another example with a different polyolefinic substrate stabilized with HATS is given in Figure 3. Retained elongation for LDPE blown films is plotted as a function of aging time at 80°C. The phenolic antioxidants and Tinuvin® 622 show a catastrophic failure behavior whereas a slow loss of properties and above all an improved protection is obtained with Chimassorb® 944, if extrapolated to the 50% retained elongation value. For many applications, the 50% retained value is not of particular significance, but was selected as a convenient failure criterium because of the catastrophic failure mode historically seen. If a lower absolute elongation value is acceptable, which is often the case, it is quite conceivable that the current three-year lifetime of the sample could be extended several times, even at 80°C.

Long term thermal stability

Figure 4: Long-term thermal stability of LPDE films. All samples contain 0.03% Irganox® 1076

Polyolefin application involving continuous or intermediate contact with hot water or detergent solutions or other extractive medias are very demanding applications where HAS as HATS concept can be applied. To illustrate the principle, 3 mm thick injection molded specimens were immersed in 90°C detergent solution for 200 days. The samples were then exposed in a 100°C oven and the time to embrittlement was determined. The control contained 0.2% Irganox® 1010 and 0.36% Irganox® PS 802, a classical system. Following 200 days detergent contact, the control sample failed after about 300 days in the 100°C oven whereas the samples containing 0.36% Chimassorb® 944 were still intact after more than 1100 days oven exposure following the 200-day detergent contact. These data are summarized in Figure 5.

Thermal stability of PP

Figure 5: Thermal stability of PP plaques after extraction.
All formulations:0.15% Irganox® B 215 + antacid, 3 mm inj. mld. sheets

Figure 6 depicts the analytical data and shows that while both Irganox® PS 802 and Irganox® 1010 were analytically depleted by the end of the 200 day contact with the 1% detergent solution, sufficient active stabilizer remained to protect the polymer for nearly 300 days at 100°C. However, for Chimassorb® 944, the original concentration of 0.36% was reduced only to 0.30%! Based on the analytical data and the performance data presented earlier, it is not inconceivable to expect these test specimens to withstand many more years of continuous exposure to 100°C.

Stabilizer analysis

Figure 6: Analysis of stabilizer after extraction in soaped water at 90°C.
All samples: 0.15% Irganox® B 215 + antacid; 3 mm thick injection molded sheets.

Superior long-term thermal stability can be achieved using HAS as HATS. For optimum results, a good processing stabilization formulation is absolutely essential and test temperatures should be lower than 140°C.

HAS as HATS is not the solution to every long-term thermal stabilization problem and not every HALS is suitable for a specific applications. However, the concept can be systematically applied in applications requiring simultaneous or subsequent UV stability and long thermal stability requirements.

Find more about the HAS as HATS concept in practice - case study Long Lasting TPO Roofing membranes with Chimassorb® 2020 Light Stabilizer.

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Access the brochure. BASF produces a full range of plastics additives, optimized to meet the special needs of the automotive industry (impact resistance, improved design, thermal stability, light stability, etc.). Read more.
Access the brochure. Tinuvin® XT 847 is a UV stabilizer for Thermoplastic Polyolefins (TPO) in roofing membranes. Read more.
Access the brochure. Chimassorb 2020 is a light stabilizer for TPO roofing membranes in building and construction applications. It contributes to exceptional weatherability and durability.
Access the brochure. Tinuvin® 1600 UV absorber has been developed for the long-lasting protection of thin-layer applications for exterior uses. Read more.
Access the brochure. Find out about the plastic additives offered by BASF to meet the challenges of the synthetic fiber industry.
Access the brochure. BASF offers the plastic packaging industry a broad range of additives including thermal and light stabilizers. Discover them.
Access the brochure. Find out about BASF stabilization solutions for the Electronics and Electrical market.
Access the brochure. BASF offers innovative stabilization solutions to solve the challenges of the building and construction industry. Discover them in this brochure.
Access the brochure. BASF provides a full range of stabilization and protection solutions for the agricultural industry. Find out more.
Access the brochure. Tinuvin® XT 55 is a Hindered Amine Light Stabilizer designed for polyethylene Tapes and Monofilaments and combining high UV with long term thermal stability.
High performance light stabilizer system. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Benzophenone UV absorber. Access product details.
Benzoate light stabilizer. Access product details.
Hydroxyphenyl Triazine UV Absorber. Access product details.
Low Volatile Benzotriazole UV Absorber. Access product details.
Benzotriazole UV Absorber. Access product details.
Benzotriazole UV Absorber. Access product details.
Very low volatile benzotriazole UV absorber. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Very Low Volatile Cyanoacrylate UV Absorber. Access product details.
Cyanoacrylate UV Absorber. Access product details.
Liquid Cyanoacrylate UV Absorber. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
High Performance Light Stabilizer Package. Access product details.
High performance light stabilizer system. Access product details.
Oxanilide UV absorber. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat Stabilizer. Access product details.
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Benzotriazole UV absorber. Access product details.
Liquid light stabilizer system. Access product details.
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Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Hindered Amine Light Stabilizer (HALS). Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
Liquid benzotriazole UV absorber. Access product details.
Very low volatile benzotriazole UV absorber. Access product details.
Benzotriazole UV Absorber. Access product details.
Benzotriazole UV Absorber. Access product details.
Low Volatile Benzotriazole UV Absorber. Access product details.
Liquid Benzotriazole UV Absorber. Access product details.
Low volatile hydroxyphenyl triazine UV absorber. Access product details.
Hindered Amine Light Stabilizer (HALS) and Heat stabilizer. Access product details.
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Case Studies from Light stabilizers and UV absorbers

Looking for longer lasting and extended warranty from your polycarbonate sheet?

Are you looking for longer lasting and extended warranty from your polycarbonate sheet?

BASF has developed Tinuvin® 1600, a high performance ultraviolet light absorber of the hydroxyphenyl triazine class exhibiting very low volatility and very high extinction coefficient. A weathering study was conducted in partnership with dott.gallina s.r.l. to evaluate the attributes of BASF Tinuvin® 1600 against standard UV stabilization.

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Protection against Light Degradation for Polyethylene monofilaments and tapes used in exterior applications

Tinuvin® XT 55 is BASF’s latest generation of HALS for the film, fibers and tapes industry. Its primary application is polyethylene monofilaments and tapes.

Tinuvin® XT 55 is a high-performance light stabilizer that has very low contribution to water carry over and therefore enables the production line to run without disturbance.

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Tinuvin® XT 847 light stabilizer fulfills revised TPO roofing membranes standard ASTM D 6878

Tinuvin® XT 847, a proprietary light stabilizer solution based on NOR-HALS (hindered amine light stabilizer) technology provides exceptional durability when used in a properly formulated TPO roofing membrane compound.

It imparts outstanding light and long term thermal stability to enable the TPO to fulfill the revised ASTM D 6878 requirements.

Due to the inherent advantages of NOR-HALS technology products from BASF, it also has lower interaction with system components and acidic environmental contaminants than traditional HALS based chemistries, helping to retain the mechanical properties of TPO membranes to meet the demands of the marketplace and building owners.

Read more about Tinuvin® XT 847 in TPO roofing membranes and access technical data.

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Long Lasting TPO Roofing membranes with Chimassorb® 2020 Light Stabilizer

Struggling to formulate long lasting TPO roofing membranes?

Read this Case Study featuring Chimassorb® 2020 light stabilizer which is recommended by the DOW™ Chemical Company for the use in VERSIFY™-based TPO roofing.

Chimassorb® 2020 combines exceptionally high UV stabilization and long-term thermal stability for both MDH and ATH flame retardant-containing TPO roofing membranes, in compliance with revised ASTM D 6878 standard.

 

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Increase Durability of Agricultural Greenhouse Films with Tinuvin® XT 100 light stabilizer

BASF has developed Tinuvin® XT 100, an advanced NOR® HALS (Hindered Amine Light Stabilizer) technology based solution providing low interaction with acidic pesticide derivatives thanks to its low basicity and its very specific alkoxy-amines chemical content.
Tinuvin® XT 100 is a cost effective light stabilizer designed to prolong the agriculture Polyethylene film lifetime. 

Read this Case Study including a Testimonial from a Chinese greenhouse films manufacturer.

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