Engineers of display materials look for solutions to break the tradeoff between light shielding effect and electrical percolation threshold in black pigment.
We have been working on black matrix application for LCD displays for decades. Since black matrix separates distinct colored sub-pixels in color filters electrically (by preventing current leakage) and physically, we provide high resistivity carbon black with light shielding effect.
Recently, we have expanded our display grade portfolio by launching an aqueous anionic dispersion of resistive carbon black. This new product enables to form thin film via standard aqueous techniques even though our incumbent display grades, dry black powders, are typically used in organic solvent system.
We are also developing new products to enable display manufacturers to achieve properties such as high thermal stability, low dielectric constant, thicker pixel separation membrane (black bump materials), etc., to meet the demands of the fast-moving display industry.
Our aqueous carbon black dispersion is a solution for applying a unique black pigment to diverse display components while achieving similar or better light shielding and electrical resistivity performance for electronic display applications than our other carbon blacks. Our aqueous black dispersion can be used to make films for light directing materials as well as electrically resistive films, light control films, optoelectronic applications, and other applications where black color and high electrical resistivity are desired. Our carbon black particles are designed to have a low structure (nearly spherical particle shape) and, therefore, the dispersion maintains relatively low viscosity.
The dispersion of carbon black is electrostatically stabilized. It does not contain small molecule or polymer dispersants.
Surface functional groups that are covalently bonded to carbon black surface are ionized in water and generate negative surface charge. Sodium counter ions are present in the aqueous phase.
To form thin film via standard techniques such as immersion, spin coating, spray coating, electromagnetic deposition, layer-by-layer deposition, lithography, etc.
Low structure allows for high carbon black loading in a polymer film without reaching percolation point. At the same time, surface treatment creates additional dielectric barrier and helps to increase resistivity further. Surface treatment also allows for stable aqueous dispersion. The particles in TPK5315 aqueous dispersion have negative charge and negatively charged carbon black particles will participate in ionic interactions with positively charged surface/polymer.
The carbon black in TPK5315 aqueous dispersion can interact with polymer colloids. TPK5315 can be used in the coating's formulations, for example in the layer-by-layer coating deposition processes.
We have unique dispersion capabilities to deliver performance solutions.