TiO2 Particle

FP-Opacity Pigments™ are the next generation development in TiO2 efficiency, moving forward from randomly distributed rutile into engineered composite pigment particles.

Watch our video about FP-Opacity Pigments™ innovative TiO2 optimisation technology.

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What is FP-Opacity Pigment™?

Our products use commercially available TiO2 pigments and a proprietary process that locks-in an improved state of TiO2 dispersion in a shell of high quality precipitated calcium carbonate.

These white pigment composites have an average particle size of 1 micron with each particle of Opacity Pigment™ containing between 3 and 6 TiO2 particles, each statistically spaced from each other by the optimum distance for scattering of 280nm.

The nature of the “special structure” of the calcium carbonate shell produced means that this product will maximize the light scattering and hence the whiteness and opacity by several mechanisms.

  • Optimally spacing TiO2 inside the Opacity Pigment™ particle
  • Spacing loose TiO2 around the particle
  • Air voids inside and on the surface of the particle
  • Diffraction from the rough surface of the particle

As a white pigment, our Opacity Pigments™ have an inherent light scattering functionality and a refractive index of 1.9, unlike extenders and fillers.

The Opacity Pigments™ are used as simple, weight for weight partial replacements for your existing TiO2. Depending on the application and formulation type, Opacity Pigments™ can normally replace between 5 and 30% of the TiO2 without reducing your product quality or performance.

Why FP-Opacity Pigments™ improve TiO2 efficiency

In a given system, there will be in the continuous polymer phase, into which TiO2 and extender are dispersed, efficiently yet randomly in the polymer. The TiO2 cannot occupy the same space as the extender, yet the extender is approximately the same refractive index as the polymer. As a result the TiO2 is compressed into the spaces between the extender, the random nature of its dispersion meaning that only about 30% of it is at the optimum 280 nm particle spacing for best TiO2 efficiency.

It is well documented that TiO2 is inefficient if too close together, or in lower concentrations if too far apart.

Since the extenders are the same refractive index as the polymer, they also effectively make “windows” in the film for light to pass through due to the lack of refraction, hence while a small amount of extender can be used to replace some of the TiO2 the effectiveness is limited to only a few % replacement before opacity drops.

By  replacing a portion of the TiO2 with FP-Opacity Pigment™, we increase the average distance between TiO2 particles by the “dilution effect”, in addition to replacing the volume of TiO2 with TiO2 particles that are optimally spaced. The effect on the statistical particle spacing is clear.

Therefore in effect, and in many plastics and coatings applications FP-Opacity Pigment™ can be used to replace 10-30% of the TiO2 and not reduce the optics.

How to use FP-Opacity Pigments™

FP-Opacity Pigments™ are the next generation development in TiO2 efficiency, moving forward from randomly distributed rutile into engineered composite pigment particles.

How to use FP-Opacity Pigments™

Beware of cheap immitations

FP-Pigments have a propriety, patented technology that enables us to produce a truly encapsulated, composite product with TiO2 particles embedded and spaced within a precipitated calcium carbonate shell; we are the only company with this technology. Currently available competitor materials are usually based on simple blends or ‘co-precipitations” of TiO2 and calcium carbonate (or other extenders) and while they claim to be composites they are in effect just random mixtures of loose TiO2 and extender – providing little more than what you could achieve directly by premixing your own TiO2 and extender. (See SEM’pics).

Compared with these competitor blends, FP-Opacity Pigments™ can provide significant improvements in titanium dioxide optimisation and overall cost savings.

Comparing a mixture to FP-460

  • FP-460 and TiO2 were compared in a model system to show the performance difference in terms of equivalent TiO2 volume

  • Paint Composition:
    – 5% TiO2 vc 30% PCC vc 35% Volume Solids

Both paints contain equivalent levels of TiO2 and precipitated calcium carbonate, in the standard paint they are dry blended in the FP-460 paint they are in the composite form.

Increase in opacity of 2.1 units equating to approximately 25% more scatter.

This model performance shows that the TiO2 used in the FP composite is approximately 25% more efficient than the loose TiO2 used in the paint.