PREPARATION OF POLYAMIDE COATING POWDER CONTAINING TITANIUM DIOXIDE

摘要

An improved process for preparing pulverulent coating compositions pigmented with titanium dioxide and based on polyamides having at least ten aliphatically bound carbon atoms per carbonamide group using the precipitation method. The titanium dioxide pigments used are without nucleating effects or only have weak nucleating effects on the polyamide precipitation. The pigments have nucleating effects less than or equal to 3 DEG C. where DELTA T=(Tmax p)-(To). Tmax p is the maximum temperature at which precipitation takes place in a solution of polyamide having pigment therein and To is the maximum temperature at which precipitation takes place in polyamide solution having no pigment therein.