Odor-free purified polyether silicones and method for their prod

Details Odor-free purified polyether silicones and method for their prod Odor-free purified polyether silicones and method for their prod

1990-05-17

1992-06-02

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525409, 528 15, 528 25, 528 31, 556479, C08F28300

Patent

active

051187647

ABSTRACT:
Disclosed are purified polyether silicone addition reaction products of a hydrogen siloxane and a polyoxyalkylene containing a terminal double bond, which in unpurified form contains one or both of unreacted polyoxyalkylene and internal rearrangement side reaction products thereof which generate unpleasant odors in the reaction product upon storage and upon contact with water, substantially free from said unreacted polyoxyalkylene and rearrangement products thereof so that the total quantity of ketones and aldehydes produced by a treatment of the purified polyether silicones in a closed system at 60.degree. C. for 24 hours with a quantity of 10.sup.-4 N aqueous hydrochloric acid equivalent to the quantity of said polyether silicones, is no greater than 1,000 ppm of said polyether silicones, which purified polyether silicones are obtained by treating the unpurified form thereof with water, an aqueous solution of pH no greater than 7 or an acidic material, until substantially all of the odorous substances are produced and then removing the odorous substances therefrom.

REFERENCES:
patent: 4463115 (1984-07-01), Hirose et al.

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