On Jan. 29, 2019 a patent was granted for Thermoplastic molding compounds with an optimized residual monomer content. R Walker, et al used the CPS Disc Centrifuge model DC24000 in their work.

As the inventors note, „A factor inhibiting use of styrene graft copolymers in molding compositions and in moldings produced therefrom is that the residual monomers (styrene monomers and vinyl cyanide monomers) remaining after graft copolymerization are undesirable, if only because of their odor, and in many cases are considered by users to be problematic.“ Therefore, particularly for certain sectors, such as food packaging, medical products, and toys, there is a need for styrene graft copolymers that either have a lower monomer content or have monomers that can be removed more easily.

In the course of their work, the inventors sought to characterize their polymers and used a range of test methods. These methods included notched impact resistance, flowability, and particle size, as measured with the CPS Disc Centrifuge. They used DCS to determine the weight-average particle size of the rubber dispersions of the graft base, the agglomerated graft base, and the agglomerating copolymer.

Around the world, researchers and inventors rely on CPS Instruments when accuracy matters most. Accurate measurement of nanoscale particulates results in increased consumer confidence in nanotechnology. Labs with a reputation for precision in quality control will garner more public support, greater investment potential, and increased compliance with regulatory policies.

The CPS disc centrifuge provides a higher resolution than light scattering or particle counting methods at a much faster rate of analysis than competitive sedimentation-based particle sizing instruments. Whether replacing an aging system or increasing capacity with a new system, an investment in a CPS disc centrifuge is an investment in consumer confidence. Learn more about our applications here.