Thiophene base colorants useful for coloring thermoset resins

A coloring agent, having the formula:

• ##STR8## wherein R.sub.1, R.sub.2 and R.sub.3 are selected from halogen, carboxylic acid, alkanoyl, aryloyl, carbocyclic forming polymethylene chains, alkyl, aryl, cyano, thioalkyl, dithioalkyl, thioaryl, dithioaryl, thiocyano, carboxyalkyl, carboxyaryl, amidoalkyl, amidodialkyl, amidoaryl, amidodiaryl, oxyalkyl, thioamidoalkyl, thioamidodialkyl, or hydrogen when an adjacent group is isobutyryl;
• R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are selected from hydrogen, alkyl, oxyalkyl, oxyaryl, sulfonamidoalkyl, sulfonamidoaryl, amidoalkyl, amidodialkyl, amidoaryl, amidodiaryl, halogen, thioalkyl and thioaryl;
• and R.sub.8 and R.sub.9 are polyalkylene oxides having an average molecular weight of from about 44 to about 2500 selected from polyethylene oxide, polypropylene oxide, polybutylene oxide and copolymers of polyethylene oxide, polypropylene oxide and polybutylene oxide.