Titanium dioxide | additives feature
Bright ideas: new titanium dioxide technologies
Titanium dioxide (TiO2 ) pigments are widely used in
plastics because of their hiding power and whiteness, which results from a high refractive index. Over the past decade, TiO2
pigments have been developed with
tailored particle sizes and surface treatments to meet the property and processing requirements of various applications. Wetting property improvements, for example, have allowed higher masterbatch loadings (up to 80% in polyolefi ns) and increased throughput during the production of masterbatches and compounds, notes Katja Scharf, manager for plastics, product application management at Kronos International. “Non-optical” titanium dioxide properties, such as
dispersion and photo-durability, have become more critical over the past decade, comments Philipp Nieden- zu, senior marketing consultant at DuPont Titanium Technologies. “These properties and their performance are being exposed as the market moves towards using less resin in the fi nal plastic article for sustainability and economic reasons. Therefore, the needs for the titanium dioxide to fl awlessly spread in the lower resin volume or provide the proper ‘sunscreen’ for the polymer matrix are in higher demand than in previous
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le.com
Jennifer Markarian reviews the latest developments in titanium dioxide pigments for plastics masterbatches and compounds
years. The improvements in non-optical properties of titanium dioxide have focused on enabling higher productivity at higher TiO2
loadings.” Effi cacy in use is a key trend, adds Niedenzu. “The
motto of ‘use less, get more’ resonates as a general trend in the plastics market. The trend is not necessar- ily a refl ection of using less titanium dioxide, but states the need to gain full perspective of what impacts titanium dioxide performance, dialling those param- eters into consideration for a system approach to opacity effi cacy. Full comprehension of the impact of processing conditions, formulation design and end-use requirements are factors that can calculate an optimum opacity solution for the plastic end use.” DuPont’s
Building
profi les are a major consum- er of titanium dioxide
January/February 2015 | PIPE & PROFILE EXTRUSION 23
PHOTO: POLYONE
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