Process for preparing a polysiloxane

A process for preparing a polysiloxane having the fromula:

• ##STR6## wherein R is a monovalent hydrocarbon radical free of unsaturation;
• R.sup.1 is a hydrocarbon radical having vinyl unsaturation;
• x and y are positive integers so that the silanol stopped polysiloxane has from 0.1 to 1% by weight of R.sup.1 groups and the viscosity of the polymer ranges between 25,000 centipoises and 1,000,000 centipoises said process comprising:
• a. homogenizing a mixture which consists essentially of:
• i. a compound of the formula (R.sub.2 SiO).sub.4 wherein R is a monovalent hydrocarbon free of unsaturation;
• or
• ii. a compound of the formula:
• (RR.sup.1 SiO).sub.4
• wherein R is the same as hereinabove defined and R.sup.1 is a hydrocarbon radical having vinyl unsaturation;
• and
• iii. a benzene sulfonic acid compound of the formula:
• ##STR7## wherein R.sup.2 is an alkyl group of from 6-18 carbon atoms and;
• iv. water;
• b. heating the homogenized mixture of (a) to form said polysiloxane;
• and
• c. adding a neutralizing amount of an alkanolamine to said mixture to neutralize said benzene sulfonic acid.