Cobalt-based catalytic dryer for polymer coatings

摘要

This disclosure relates to catalysts for the auto-oxidative drying of polymers, in particular for polymers used in paints or inks, based on unsaturated fatty acids, mostly from vegetal origin A compound is divulged for use as a polymerisation agent in coatings, characterized in that it comprises a cobalt-bearing alkyd polymer, said polymer having a cobalt content of 0.5 to 6% by weight, a mean molecular weight of more than 3000, and comprising cobalt carboxylate sequences Several processes are presented to illustrate the synthesis of the cobalt-bearing polymer These polymers retain the catalytic effect of cobalt towards the drying of polymers, while they greatly suppress the toxicity of cobalt by being essentially insoluble in water.

主权项

1. A compound for use as a polymerization agent in coatings, the compound comprising a cobalt-bearing alkyd polymer, the polymer comprising cobalt carboxylate as a repeating unit and having a cobalt content of 0.5 to 6% by weight, a mean molecular weight of more than 3000, and an acidity value of less than 30 mg KOH/g.