| abstract |
The present invention provides a method that can be used to achieve a low proportion of cyclic compounds in an emulsion polymerization reaction. A method of preparing an emulsion containing particles of an organopolysiloxane polymer having an average particle size of less than 1 μm, wherein (i) a silanol end-blocked organosiloxane starting polymer, water, and a surfactant are mixed. The starting polymer has a viscosity of at least 2 Pa · s, preferably at least 2.5 Pa · s, preferably at least 3.5 Pa · s, preferably at least 4 Pa · s and at most 150 Pa · s And (ii) emulsifying the starting polymer by stirring or shearing the components, and (iii) polymerizing the starting polymer, by polymerizing the starting polymer, Long chain, silanol end-blocked organopolysiloxane polymer Forming includes a step, wherein the polymerization is to process at least in part, 16 ° C. or less, preferably carried out at a temperature below 15 ° C., by the method, solving the above problems. [Selection figure] None |