HTPA – 410 pigments are formaldehyde free thermoplastic polyster base fluorescent pigments for use in plastic coloring (except PVC) & masterbatch applications. These pigments are good tintorial strength and bright shades.

HTPB-511P pigments are Formaldehyde free thermoplastic polyamide base fluorescent pigments for use in plastic colouring (except PVC) & masterbatch applications. These pigments have improved temperature stability and better light fastness than HTPA-410 series range.

HTPA 410 / HTPB 511L/HTPB 511P/ HTPB 511AQ Series

Fluorescent colors are translucent. Generally polyethylene's and polypropylenes provide a certain degree of opacity, crystal polystyrene provides transparent effect with excellent edge glow. Opacity can be improved, if necessary by small additions of rutile grade titanium dioxide(0.1 – 0.3% based on polymer). Fluorescent color will become more pastel, as the quantity of titanium dioxide increases.

The addition of wetting agents such as mineral oil or butoxy ethyl stearate at 0.1% based on polymer improves adhesion of the pigment to the polymer during dry tumbling, resulting in better dispersion and color strength. Minimum processing temperature of 140⁰C, should be maintained for proper dispersion.

Certain metal ions and nucleated polymers are known to cause color changes and loss of brightness with fluorescent colorants. Studies shows that plastic processing additives containing zinc, magnesium, calcium, and iron will cause deleterious color effects when used in conjunction with these pigments. If a metal containing additive must be used, it should be thoroughly tested to ensure the color stability with these pigments.

Fluorescent colors may form a deposit on the mold, screw, nozzle and other contact surfaces during processing, this is referred to as Plate-out. The cause is believed to be due to phase transfer of the fluorescent dye stuff with
in the processing polymer. It has been reported that addition of a small amount of fumed silica is effective in reducing plate-out.