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Titanium dioxide, extenders, fillers, not‐in‐kind replacements—what does it mean for plastics?
Author(s) -
Holtzen D. A.
Publication year - 1989
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730110408
Subject(s) - compounding , filler (materials) , titanium dioxide , materials science , absorption (acoustics) , composite material
Recent publication and presentations extol the virtues of filler pigments as titanium dioxide extenders. Theory predicts and experiment shows that in plastic systems, where pigment concentrations are relatively low, compared to paints and inks, fillers do not significantly improve the optical efficiency of titanium dioxide. Close examination of published data shows that there are many unanswered questions such as: How do variations in compounding conditions affect efficiency? Has sufficient attention been paid to measurement of light reflectance and transmission? Have the effects of light scattering and absorption been taken into account to explain optical measurements? What we have found is that there is no easy “fix” to improve the efficiency of titanium dioxide by the use of filler pigments. Serious questions also remain unanswered regarding the effect of ad hoc replacement of TiO 2 with filler in systems requiring light stability such as rigid polyvinyl building products.