ACID-RESISTANT COATED PIGMENTS

摘要

The invention relates to the use of pigments coated in an acid-resistant manner in PVC synthetic material. Acid-soluble pigments are provided with a coating of an organic compound that melts at a temperature of T>200° C., and as a result the otherwise acid-soluble pigments are still protected from HCl vapor even at PVC processing temperatures of between 180° C. and 200° C.