MATERIALS | PLASTICISERS
Baerlocher developed a method to show differences in exudate over time on a cloth that was in contact with the plasticisers, viewed under a black light. Line 1 is DOTP, line 2 is DINP, line 3 is Innoleics FF (normally used at 30% less than in this experiment), line 4 is Innoleics GPs 75, line 5 is Innoleics GPe 9, line 6 is Innoleics GPe 10, lines 7-10 are Baerlocher’s patent-pending modified bioplastisers
ExxonMobil, as well as the American Chemistry Council’s (ACC) High Phthalates Panel, released statements noting their disagreement with the decision and pointing out that it is not a prohibition of manufacturing or use. In May 2024, ACC report- ed on the completion of EPA’s draft manufacturer- requested risk evaluation for di-isodecyl phthalate (DIDP) and the release of draft hazard assessments for DINP; ACC noted its full confidence in the safety of DIDP and DINP. ACC has also said that news outlets reporting on phthalate plasticisers should not group them together as a class, as they are functionally and toxicologically different from each other. The organisation pointed out that DINP and DIDP are part of the “high phthalates” category, with seven or more carbon atoms in their chemical backbone that give them increased durability.
Plant-based plasticisers Baerlocher USA announced an agreement in March this year to become the sole distributor of bio-based plasticisers made by Innoleics to the US market. These plant-based alternatives to tradition- al plasticisers enhance PVC processing and properties and reduce or eliminate the issues typically associated with vegetable-based plasticis-
26 COMPOUNDING WORLD | August 2024
ers. The additives contain 85-100% bio content from soybean oil, which provides a negative cradle-to-gate carbon footprint because the plants sequester carbon. If these bio-based plasticisers are used in combination with bio-attributed PVC resin, the PVC compound could have a negative carbon footprint as well, said Josh Wierzba, PVC Additives business unit Director at Baerlocher USA. Innoleic GPs 75 is aimed at replacing DINP and Innoleic GPs 10 is aimed at replacing DOTP [dioctyl terephthalate, also known as bis (2-ethylhexyl) terephthalate (DEHT)], said Jacyr Quadros, Director at Innoleics. The Innoleics products are epoxidised molecules, which gives them greater efficiency in plasticising and reduced dry-blend time, but similar volatility to the traditional plasticisers they aim to replace. They also show improved resilience, with increased tensile and elongation in the final product. There are some performance differences, such as water absorption and rheological properties that should be properly considered and evaluated for each individual application, but the companies aim to support formulators in optimising performance and providing solutions for their specific needs. Recent work at Baerlocher in collaboration with Innoleics investigated the potential exudation of bio-based epoxidised plasticisers. “There was a concern in the market that soy-based plasticisers would accumulate on the surface of a PVC part, but we observed no differences in exudate with conventional testing,” said Michael Short, PVC Technical Specialist at Baerlocher. To further investi- gate, the scientists developed a method that showed differences over time with different formulations under a black light. The results showed that the Innoleic GPs 75 had less exudate than DINP or DOTP. It also showed that the GPe 9 and 10 presented similar exudation when com- pared to DINP and DOTP. Baerlocher is also introducing new patent-pend- ing formulations containing bioplasticiser/liquid mixed metal stabiliser one-pack solutions with improved colour hold during processing. The one-packs with a calcium-zinc stabiliser have demonstrated increased dynamic stability as well as improved thermal aging and are useful in applications such as wall coverings. “Our custom- ers are interested in sustainable formulations with bio content and lower carbon footprint,” said Wierzba. “We can now provide Innoleic’s products as well as tailor-made solutions.” Cargill’s BioIndustrial group’s most recent addition to its line of plasticisers is the bio-derived Biovero AC-500. The product is targeted to wire and cable and can complement or replace TOTM
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IMAGE: BAERLOCHER
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