| 摘要 |
A silicone emulsion which provides an elastomeric product upon removal of water under ambient conditions comprises (A) 100 parts by weight of an anionically stabilized, hydroxyl endblocked polydiorganosiloxane, present as an oil-in-water emulsion, (B) from 1 to 150 parts by weight of amorphous silica, (C) from 0 to 200 parts by weight of filler other than amorphous silica, and (D) from 0.1 to 1.5 parts by weight of alkyl tin salt, and has a pH of 9 or greater and a solids content of less than 40 percent by weight. It is obtained by (I) emulsifying the diorganosiloxane using an anionic surfactant in water, (II) adding the amorphous silica, any other filler, the alkyl tin salt, and from 0 to 3 parts by weight of an organic amine composed of carbon, hydrogen, and nitrogen atoms, or carbon, hydrogen, nitrogen, and oxygen atoms, said amine being soluble in the amount of water present in the emulsion, and (III) adjusting the pH of the resulting emulsion to 9 or greater, the amount of water in (I) being such that the solids content of the final silicone emulsion is 40 percent by weight or less. Substrates may be treated with these emulsions. |
