ADDITIVES: Antiblock For Films Combines Attributes Of Traditional Additives

New antiblock additive for polyolefin films delivers best attributes of talc, nepheline syenite and diotomaceous earth.

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A new antiblock additive developed by mineral producer Trinity Resources Ltd., Newfoundland, Canada (U.S. distributor is Maroon Group, Avon, Ohio), is produced from the company’s pyrophyllite deposit there and its morphology is said to combine the best attributes of talc, nepheline syenite (NS) and diatomaceous earth (DE). “By focusing on our logistics and manufacturing costs, we are able to balance the cost-to-performance equation for polyolefin film processors throughout the NAFTA region,” says Trinity’s president and CEO John Hurley.

Pyrophyllite, a hydrous aluminum silicate mineral, is the basis for the new Airblock. It is said to offer a natural blend of talc-like platy particles and irregular, blocky particle shapes to provide optimal blocking, clarity, film strength, barrier resistance and improved thermal efficiency of the film. Airblock’s key features include: very low iron content (<0.%), which reduced organic degradation; lower hardness compared to DE and NS, resulting in less machine wear; a refractive index comparable to the best antiblock products—it approaches that of NS and outperforms talc and DE on clarity; and, very low moisture content of less than 0.2%, resulting in reduced gassing and venting issues and improves shelf life. (440) 937-1000 •