| abstract |
The present invention relates to a process for producing a silane coupling agent by reacting a silane coupling agent having an alkoxy group and a polymerizable double bond with a siloxane oligomer obtained by ring-opening a cyclic organosiloxane in the presence of an acid catalyst and an anionic surfactant, A copolymer obtained by copolymerizing an ethylenically unsaturated group-containing monomer with an organopolysiloxane containing at least two hydroxyl groups and a hydroxyl group-containing organopolysiloxane with at least two hydroxyl groups, and a cyclic organosiloxane- A siloxane content of 0.3% or less, and a content of the anionic surfactant of 1% or less. The powders of the present invention can be blended with hair cosmetics, makeup cosmetics, sunscreens, and the like, so that they can impart smoothness, soft touch, and water repellency. |