the combination of a thermoplastic polymer and a thermosetting polymer , provides a pigment system for producing coated printing papers . the thermoplastic polymer and thermosetting polymer , suspended in well - known coating binders and carriers , is applied to the web substrate on a standard paper machine . the amount of thermoset , preferably at least about 25 % by weight of the pigment solids , improves ink receptivity and allows adjustable control of finished paper gloss . the amount of thermoset added to the pigment system is limited , however , preferably below about 75 % by weight of the pigment solids , so that the finished printing paper obtains a gardner 75 ° gloss of at least about 40 , at calendering pressures of less than 500 pli .