A new synthetic silica has been prepared with a higher pore volume to provide increased anti-blocking efficiency. Tests with 35 μm thick low density polyethylene (LDPE) and polypropylene (PP) films showed that this new anti-block material reduced the blocking force, especially at lower antiblock levels of 1000–1500 ppm. Additionally, the new additive reduced discoloration and improved scratch resistance. An organic coating on this new synthetic silica prevents the adsorption of slip additives which occurs to result in an increase of CoF with traditional synthetic silicas.
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References
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