| abstract |
According to the invention, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, rubidium hydroxide, ammonium hydroxide, hydroxide in an amount of 50 ppm or more based on the amount of low MW phenylalkylsiloxane under vacuum. By polymerizing the low MW phenylalkylsiloxane in the presence of an aqueous alkali solution containing one or more alkalis selected from the group of tetraalkylammonium, tetraalkylammonium alkoxide and phosphonium hydroxide, A method for producing pure high MW phenylalkylsiloxane is provided. |