Process for preparation of water-soluble, silicone modified alkyd resins

A process for the preparation of water soluble, silicone-modified alkyd resins which comprises

• I. forming an alkyd resin (A) by reacting
• 1. 0 to 70 percent by weight of a drying oil fatty acid,
• 2. 18 to 70.9 percent by weight of a dicarboxylic acid or its anhydride or a mixture of them, with
• 3. 19 to 51.7 percent by weight of an aliphatic polyhydric alcohol wherein the percent by weight of (1), (2) and (3) is based on the total combined weight of (1), (2) and (3), the mole ratio of (2) to (3) being in the range of from 1 to 0.6, until the alkyd resin has an acid number of 20 or less, and then
• Ii. reacting with 28 to 92 parts by weight of (A) 5 to 60 parts by weight of a silicone compound (B) represented by the formula
• (R.sub.n SiX.sub.m P.sub.(4-m-n)/2).sub.y
• wherein R is a monovalent hydrocarbon radical, X is an alkoxy or hydroxy radical, n is a number of from 1 to 2, m is a number of from 0.05 to 3, the sum of m+n does not exceed 4 and y is a number of at least 3, and
• Iii. reacting 3.0 to 18.5 parts by weight of a polyvalent carboxylic acid (C) with the reaction product of (A) and (B) to introduce carboxylic groups into said reaction product until the acid value thereof is from 25 to 70.