PIGMENTS | BLACK AND WHITE
its FP-550 Opacity Pigment to improve the optical performance of TiO2
masterbatches. 60% TiO2
In the study, the pigment was used to produce a masterbatch in which the level of
“normal” TiO2 was 55% and the amount of LDPE
20%, with the remaining 25% made up of FP-550 (which contains 20% ‘”optimally spaced” encapsu- lated TiO2
masterbatch comprising 60% TiO2
). This was compared against a regular and 40% LDPE,
Graph showing contrast ratio of compounds produced with with TiO2, TiO2 and FP-550 Opacity Pigment (from FP-Pigments), and calcium carbonate Source: FP-Pigments
masterbatch (but oddly enough not bags full of TiO2
), due to its classification as a possible (catego-
ry 2) carcinogen. This has been strongly contested by industry body TDMA: “The classification does not correlate with a vast body of scientific evidence that already demonstrates that TiO2
cancer in humans,” it says. During 2022, TiO2
additive in the EU, unless an objection is adopted by the end of the year by either the European Council or the European Parliament.
TiO2 alternatives For companies considering alternatives to TiO2 , or
at least ways to stretch it out, there are other minerals that can be
used.Omya recently launched OmyaPET, a family of functionalised calcium carbonates for use as a cost-effective opacifier in white opaque PET bottles or BOPET film. Accord- ing to Karsten Schulz, Business Development Direc- tor Polymers, high opacities can be achieved with OmyaPET but when a 100% light barrier is re- quired, such as in UHT milk bottles, some TiO2
is
needed. “In single-layer PET milk bottles, the use of 10% TiO2
70% of the TiO2
is common and Omya has shown that can be replaced by OmyaPET.”
Another calcium carbonate supplier, Reverté, is also offering product to complement TiO2
. It
recently introduced a new grade for the production of white masterbatch. Calcipore 80T AL is designed to offer high productivity and filler level in the masterbatch and enables the opportunity to reduce levels of TiO2
in white masterbatch, the
company says. Finnish company FP-Pigments says it uses a
proprietary technology to produce its FP Opacity Pigments, which encapsulates TiO2
pigment in a high
purity precipitated calcium carbonate. It recently completed a study investigating the potential to use
28 COMPOUNDING WORLD | November 2021
and a third masterbatch in which half of the LDPE was replaced by calcium carbonate (so also containing 60% TiO2)
. Colour and opacity results
from all three were compared in blown films and injection moulded plaques containing respectively 5% and 2% masterbatch in LDPE. In films, the masterbatch containing FP-550 gave
results that were said to be at least equivalent to the standard and significantly better (over two units of Contrast Ratio) than with the CaCO3
/TiO2 does not cause will likely be banned as a food
masterbatch. L* value results were in line with the opacity measurements, with the FP-550 master- batch showed a superior performance. The b* values showed FP-550 to be slightly bluer while a* values remained similar. For moulded plaques, the masterbatch contain-
ing FP-550 Opacity Pigment gave results that were better than the standard while the CaCO3
replace-
ment resulted in poorer L* value results. “The reason that this substitution is possible is due to the unique spacing of the TiO2
inside the
FP-Pigment particle matrix,” says Andy White, Business Unit Director Paints and Plastics. “
CLICK ON THE LINKS FOR MORE INFORMATION: �
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www.sunchemical.com �
www.shepherdcolor.com �
www.alfarben.com �
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www.gabriel-chemie.com �
www.hollandcolours.com �
www.kafrit.com �
www.colloids.com �
www.cabotcorp.com �
www.orioncarbons.com �
www.bolderindustries.com �
www.envirosystems.se (Scandinavian Enviro Systems) �
www.tipmcconsulting.com �
www.cinkarna.si �
www.lomonbillions.global (LB Group) �
www.omya.com �
www.reverteminerals.es �
www.fp-pigments.com
www.compoundingworld.com
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