| 摘要 |
<p>The invention is concerned with water dilutable binders for air drying coating compositions, the content of auxiliary organic solvent of which lies below 15 % of binder solids. One object of the invention is the use of such binders in the formulation of air drying paints which are useful for industrial applications and for use by both professional and "do-it-yourself" painters. Another object is the formulation of force-drying coating compositions and, in conjunction with hardening components, such as amine or phenolic resins, for stove paints. The binders consist of partial condensation products of: (A) 30 - 70 % by weight of a film forming fatty acid modified alkyd resin intermediate with an acid value of between 30 and 200 mg KOH/g, an intrinsic viscosity ?A of from 4.5 to 8 ml/g and an oil length of from 5 to 60 %, with (B) 70 - 30 % by weight of a film forming fatty acid modified alkyd resin intermediate with an acid value of below 5 mg KOH/g, a hydroxyl value of from 50 to 300 mg KOH/g, an intrinsic viscosity ?B of from 8 to 12 ml/g and an oil length of from 5 to 60 %. the ratio between the intrinsic viscosities lying between 1.4 to 2,7. Owing to the favourable gradient of the dilution curve, solutions are obtained which have a high solids content and are ready for application.</p> |
