Method of manufacturing purified products of liquid medium-chain alkyl-modified polydimethysiloxane and cosmetics prepared therefrom

A method of manufacturing a purified product of a liquid medium-chain alkyl-modified polydimethylsiloxane comprising the steps of:

• [A] synthesizing a liquid medium-chain alkyl-modified polydimethylsiloxane represented by general formula (2) by carrying out a hydrosilylation reaction between a hydrosilyl-containing polydimethylsiloxane of general formula (1) and an α-olefin with 4 to 18 carbon atoms;
• and
• [B] subjecting a crude product of the liquid medium-chain alkyl-modified polydimethylsiloxane obtained in preceding step [A] to an odor-removing treatment by conducting a hydrogenation reaction which is carried out in the presence of a hydrogenation catalyst:
• where R1 represents a hydrogen atom or a methyl group;
• “m” is an integer from 0 to 6;
• and “n” is an integer from 0 to 3;
• however, when “n” is 0, then at least one R1 represents a hydrogen atom.
• where R2 represents an alkyl group with 4 to 18 carbon atoms;
• R3 are groups represented by R2 above or a methyl group;
• and “m” and “n” are the same numbers as defined above for general formula (1);
• however, when “n” is 0, at least one R3 is the same group as defined for R2.