DayGlo Saturn Yellow (T-17N)

DayGlo T/GT pigments are thermoset, fluorescent pigments that are recommended for applications where solvent resistance is required. GT pigments have higher color strength than T pigments and are based on the same thermoset resin matrix. All are insoluble in a greater number of solvents than are DayGlo A/AX thermoplastic pigments. DayGlo T/GT pigments are designed to be used in formulations and coatings where strong solvents are used and where softening by heat and pressure may be a problem. They are also suitable for use in water based latex systems, where long-term shelf stability is required

Being organic in nature, the pigments are, in most cases, easily wet out and dispersed in solvent-based vehicles or liquid resins by intensive stirring (Cowles Dissolver). Formulations produced by such means give Hegman Gage readings of 4.5 to 5.0 for application by spray, brush and roll, or knife coating. If finer particle sizes are required, T/GT pigments can be wet ground in suitable formulations by wet milling.

The fact that T/GT pigments are based on a thermoset resin permits them to be used in various coatings or inks made with nitrocellulose, polyvinyl chloride-acetate, polyamide, acrylic, chlorinated rubber and other resins which require strong oxygenated types of solvents such as aromatics, alcohols, esters or ketones. Combinations of these solvents should be evaluated before use.

Color bleed may be a problem in some instances, usually with the red colors. It can occur even though the pigment resin matrix is thermoset and insoluble, and the fluorescent dye is in solid solution throughout the pigment particles and not merely absorbed on the surface. Some solvents leach enough dye from the insoluble particles so that color transfer may be noticeable when the coating surface involved contains significant amounts of plasticizers.

T/GT pigments are suitable for paper coating applications, either solvent or water latex based. Since the pigments are not softened by heat or pressure, the coated paper can be calendared without glazing or sticking to the rolls.

Solvents:
T/GT Pigments are substantially resistant to the following solvents and plasticizers.

Mixtures of some solvents may have a more severe effect on T/GT pigments than the individual solvents alone. An example of such a mixture is equal parts of methyl ethyl ketone and ethyl acetate. This mixture, will partially solvate the pigments producing some bleed and swelling of the pigment. Each solvent alone will not.
It is impossible to completely evaluate the effect of all solvents and mixtures of solvents on the T/GT pigments. They should be tested for satisfactory performance in the system in which they are intended to be used.