Hydrosilylation method

A process for producing a silyl-terminated alcohol by reacting a vinyl-functional alcohol with a hydrolysable silyl hydride in the presence of a platinum catalyst, comprising the steps of:

• a) heating the vinyl-functional alcohol to a temperature of 40 to 65° C., then
• b) adding the platinum catalyst and from 0.8 to 1.1 moles of the hydrolysable silyl hydride per mole of vinyl-functional alcohol to the heated vinyl-functional alcohol to form a reaction mixture;
• then
• c) reacting the reaction mixture under conditions such that at least part of the vinyl-functional alcohol and at least part of the hydrolysable silyl hydride react to form the silyl-terminated alcohol, wherein the temperature of the reaction mixture increases at least partially due to exothermic heat of reaction to above 75° C. but not greater than 100° C., and then
• d) upon conversion of 90 to 99% of the vinyl groups of the vinyl-functional alcohol, cooling the reaction mixture to a temperature of 65° C. or below, whereby after step d) the conversion of vinyl-functional alcohol is at least 90% and the amount of high molecular weight impurities is no greater than 10% of the combined weight of the starting amounts of vinyl-functional alcohol and hydrolysable silyl hydride.