process for the production of thixotropen lackbindemitteln on alkydharzbasis.

摘要

A process for the preparation of thixotropic paint binders based on alkyd resins, essentially comprising a) from 80 to 98 % by weight of alkyd resins having oil contents of from 20 to 86 % by weight and b) from 2 to 20 % by weight of a thixotropy carrier comprising b1) polyisocyanates having pendant alkyl substituents and having a molecular weight of up to 1 000, and b2) monohydric and/or dihydric alcohols having a molecular weight in the range from 32 to 800, in which the thixotropy carrier is prepared by reacting starting components b1) and b2) while maintaining an NCO/OH equivalent ratio of from 2:1 to 1:2 at from 50 to 180 DEG C in the presence of at least some of the alkyd resin a), and optionally in the presence of inert solvents, and the use of the binders which have been rendered thixotropic, obtained by this process, optionally in combination with crosslinker resins as binder or a binder component for coating compositions.