Thermoplastic polymer particles in liquid thermosettable resin

A hot melt coatable thermosettable resin composition comprising:

• a) a thermosettable mixture that is liquid at a temperature in the range of 20.degree. to 100.degree. C. comprising one or more thermosettable resins and one or more curvatives for the thermosettable resins and
• b) resin particles of one or more amorphous thermoplastic polymers, said particles being dispersed in the thermosettable mixture at a temperature below the dissolution temperature of the particles, the particles having an average diameter in the range of 0.5 to 50 micrometers, a surface area of at least 1.0 m.sup.2 /g, and a dissolution temperature of 50.degree. C. or higher and being essentially insoluble in the thermosettable resin at temperatures up to 15.degree. C. below the dissolution temperature;
• said resin composition being free of solvent for the thermoplastic particles and having a viscosity that decreases with increasing temperature up to a dissolution temperature and that increases with increasing temperatures at temperatures above the dissolution temperature, said amorphous particles being completely dissolved in the thermosettable resin at a temperature at least 20.degree. C. below the cure temperature of the resin, and providing a homogeneous cured resin composition.