BINDER COMPOSITION FOR PREPARING PIGMENT PASTE,AND WATER-BASE COATING MATERIAL CONTAINING THE COMPOSITION

摘要

A binder composition is described which is suitable even without addition of emulsifier for the grinding of pigments for aqueous coating compositions. It contains 20 to 40 parts by weight of polyester urethane resin having an acid number of 10 to 50, whose acid groups (lacuna) to 70 to 100 % with ammonia and/or amines and with a number average of the molecular weight of 2000 to 30000, obtainable from polyester polyol with an OH number of 35 to 200 and a number average of the molecular weight of 500 to 5000 mixed with 2 to 30 % by weight of diols with a molecular weight of 60 to 350, of which one part at least contains an acid group capable of anion formation, and with 0 to 6 % by weight of triols with a molecular weight of 60 to 350, with diisocyanates in a ratio of OH groups to NCO groups of over 1.0 to 1.3; and in addition 4 to 25 parts by weight of water-miscible organic solvent and 15 to 75 parts by weight of water.