Carbinol-functional silicone resin, and method for producing silicone-modified polyester

A carbinol-functional silicone resin, wherein the carbinol-functional silicone resin is prepared by reacting a raw silicone resin having at least 1 mass % of silicon atom-bonded hydroxyl groups, silicon atom-bonded alkoxy groups, or a combination thereof, and a dihydroxy-functional compound, in the presence of a condensation catalyst and a solvent;

• wherein the carbinol-functional silicone resin forms a silicone-modified polyester without gelation;
• wherein the raw silicone resin is represented by the following compositional formula:
• R1a(HO)b(R3O)cSiO(4-a-b-c)/2,
• where R1 is a monovalent hydrocarbon group having 1 to 12 carbon atoms, R3 is an alkyl group, and “a” is a number of from 0.8 to 1.8, provided that “b” and “c” are numbers such that at least 1 mass % of silicon atom-bonded hydroxyl groups, silicon atom-bonded alkoxy groups, or a combination thereof are present;
• wherein the dihydroxy-functional compound is represented by the following general formula:
• HO—(R2O)n—H,
• where R2 is an alkylene group having 2 to 12 carbon atoms, and “n” is 1;
• and
• with the provisos that:
• when the raw silicone resin has i) only silicon atom-bonded hydroxyl groups or ii) only silicon atom-bonded alkoxy groups, the dihydroxy-functional compound is reacted with the raw silicone resin in an amount such that a mole ratio of hydroxyl groups in the dihydroxy-functional compound per silicon atom-bonded hydroxyl groups or silicon atom-bonded alkoxy groups in the raw silicone resin is in a range of from 0.5 to 2.0;
• and
• when the raw silicone resin has iii) both silicon atom-bonded hydroxyl groups and silicon atom-bonded alkoxy groups, the dihydroxy-functional compound is reacted with the raw silicone resin in an amount such that a mole ratio of hydroxyl groups in the dihydroxy-functional compound per silicon atom-bonded hydroxyl groups and silicon atom-bonded alkoxy groups in the raw silicone resin is in a range of from 0.5 to 2.0.