Odor-free purified polyether silicones and method for their production

A purified polyether silicone addition product of a hydrogen siloxane and a polyoxyalkylene containing a terminal double bond which, in unpurified form, contains unreacted polyoxyalkylene, internal rearrangement side reaction products thereof, or both, which generate unpleasant odors in the reaction product upon storage and upon contact with water, wherein the degree of unsaturation thereof due to the presence therein of unreacted polyalkoxyalkylene, internal rearrangemeant side reaction products thereof, or both, is no greater than 0.02 meq/g and the total quantity of ketones and aldehydes produced by contacting the purified polyethersilicone in a closed system for 24 hours with a quantity of 10.sup.-4 N aqueous hydrochloric acid equivalent to the quantity of said polyether silicones at 60.degree. C., is no greater than 100 ppm calculated on said polyether silicones.

A purified polyether silicone addition product containing less than 100 ppm unreacted polyalkylene and internal rearrangement products thereof, wherein said product is produced by the process comprising:

• treating an odor generating unpurified form thereof with (a) water, (b) an aqueous solution of pH no greater than 7 or (c) an acidic material, until substantially all of the unreacted polyoxyalkylene and internal rearrangement products thereof are converted to odorous substances, and
• then removing the odorous substances from the thus-treated polyether silicone,
• wherein water, said aqueous solution or said acidic material is added to a reaction solution obtained by conducting the addition reaction of a hydrogen siloxane with a polyoxyalkylene in a reaction solvent, heating and stirring the resulting mixture and then removing the thus-produced odorous substances by a strip purification.