Alkyd resins which are dilutable with water and form room-temperature drying varnish coatings
The object of investigations were room-temperature drying and water-soluble alkad resins on the basis of unsaturated fatty AIDS from linseed oil, isophthalic acid (IFA), trimellitic anhydride (TMA) and trihydroxymethylpropane.In the individual experiments, a portion of IFA—in the amount of 10—30 %by weight—has been substituted by a stechiometrically equivalent amount of TMA. It has been found that an increase in The weight fraction of TMA in the resins necessitates some chan ges in the conditions of their synthesis and an increase in the excess of hydroxyl groups in the initial mixture of substrates. Resins containing a high er amount of TMA had a higher weight average molecular mass, a wider molecular mass distribution and a better water solubility. Thus, TMA play a double role in the systems under investigation: it increases the degree of branching in the products and imparts them water solubility, inspite of a loweracid value. On the other hand, in the studiem range of contents, TMA has no distinct effect on dryling characteristics and mechanical properties of pigmented varnish coatings obtained on the basis of these resins.
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