Polymers and additives | products ANTIBLOCK ADDITIVES Trinity Resources adds new antiblock
Trinity Resources has introduced a new antiblock additive for plastic films. Called Altiblock, it is produced from the com- pany’s pyrophyllite deposit located in Newfoundland, Canada. John Hurley, Trinity’s president and
chief executive officers, says: “Talc, nepheline syenite and DE have been the incumbent high performance antiblock minerals in plastic films for a long time. The morphology of our Altiblock combines the best attributes of talc,
MEDICAL COMPOUNDS
nepheline syenite and DE into one product”. Pyrophyllite is a hydrous aluminium
silicate mineral, offering a natural blend of talc-like platy particles and irregular, blocky particle shapes. Trinity says that this provides optimal blocking, clarity, film strength, barrier resistance and improved thermal efficiency of the film. The mineral’s properties include: very
low iron content (less than 0.2%); lower hardness compared to DE and nepheline syenite; a refractive index close to
nepheline syenite, which has the highest clarity in the market; and low moisture content. Altiblock is available in four sizes – 2, 4, 6 and 9 microns – with distinct morphology and particle size distribution curves. For a talc replacement, Altiblock D400 can improve block force and clarity, while for a DE replacement, Altiblock D900 can improve clarity while being equivalent in block force, claims Trinity. ❙
www.trinityresources.ca
CALCIUM CARBONATE
Huber reclaims fillers
Foster stabilizes medical Pebax
US-based Foster Corporation has developed two heat- and light-stabilized medical grade polyether block amide (PEBA) copolymers that are claimed to resist oxidation and degrada- tion during storage. Medical grade PEBA
copolymers can degrade over time when exposed to oxygen, moisture, heat and UV light, which can cause a loss of material performance and reduced functionality in medical device components. The new Foster HLS formula- tions are manufactured from medical grade Pebax polymers (produced by Arkema) and use
www.compoundingworld.com
a specially-developed USP VI compliant stabilizer system. The company says that its
studies have shown that the HLS 2533 MED grade exhibits substantial long-term property retention compared to a non-stabilized PEBA medical grade. After six months of exposure to multi-source indoor light, HLS 2533 MED test samples retained 99% of their tensile strength; the non-stabilized PEBA samples showed severe degradation and property attrition after just three months of light exposure. In a separate study,
samples were exposed to
temperatures of 55˚C for 32 weeks to simulate ageing for five years at 25˚C. The HLS stabilized samples retained 99% tensile strength after the exposure, compared to 78% for the non-stabilized alternatives. “The HLS stabilizer
system helps maintain integrity of the base resin by minimising unanticipated changes in chemistry and molecular weight caused during certain storage conditions,” says Bill Blasius, manager of R&D and polymer science at Foster. ❙
www.fostercomp.com
Huber Engineered Materials has introduced ReCal Platinum calcium carbonate, which has 50% certified post-consumer content by weight, plus 50% post-indus- trial content. The light-grey filler is designed to be used in building materials to generate various ‘green building’ credits, or in other demanding applications where certified post-consumer content is required. One pilot project involved recovering calcium carbonate from a painting operation and then using it in a latex carpet backing. Huber offers two grades of the additive, which is produced in a proprietary re-milling process. ReCal Platinum 8 and ReCal Platinum 20 have median particle sizes of 8 and 20 microns respectively. ❙
www.hubermaterials.com
July 2014 | COMPOUNDING WORLD 61
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