Method for producing transparent or semi-transparent liquid glycerin-derivative-modified silicone composition

1. A method for producing a transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition, the method comprising a hydration step of adding water to an opaque liquid glycerin derivative-modified silicone or composition thereof, wherein from 0.1 to 10 parts by mass of water per 100 parts by mass of the opaque liquid glycerin derivative-modified silicone or composition thereof is added in the hydration step, and wherein the opaque liquid glycerin derivative-modified silicone is represented by the structural formula (1-1):

wherein

R 2 is C 9-60 monovalent hydrocarbon group,

L 1 is —C 2 H 4 Si(OSiMe) 3 ,

Q is a glycerin derivative group selected from the groups represented by the following formula (5-1)

and formula (5-2)

wherein R5 is a divalent organic group that does not contain an oxyalkylene structure wherein an average value of the number of repetitions of the oxyalkylene unit is two or more,

X is a group selected from the group consisting of a methyl group, R 2 , L 1 , and Q,

wherein n1, n2, n3, and n4 are each independently greater than 0 and n1+n2+n3+n4 is a number in a range of greater than 50 to 1,000.

2. The production method according to claim 1 , wherein, in the hydration step, from 0.2 to 5 parts by mass of water per 100 parts by mass of the opaque liquid glycerin derivative-modified silicone or composition thereof is added.

3. The production method according to claim 1 , wherein, in the hydration step, the opaque liquid glycerin derivative-modified silicone or composition thereof and the water are mixed to homogenize.

4. The production method according to claim 1 , wherein a light transmittance at 750 nm (optical path length 10 mm) of the transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition is not less than 50%.

5. The production method according to claim 1 , wherein R 2 is a monovalent hydrocarbon group having from 9 to 60 carbon atoms.

6. The production method according to claim 1 , further comprising, before or after or simultaneously with the hydration step, a liquid oil agent addition step of adding a liquid oil agent to the opaque liquid glycerin derivative-modified silicone or composition thereof and/or the transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition.

7. The production method according to claim 6 , wherein the liquid oil agent has affinity with the liquid glycerin derivative-modified silicone.

8. The production method according to claim 6 , wherein, in the liquid oil agent addition step, from 5 to 1000 parts by mass of the liquid oil agent per 100 parts by mass of the liquid glycerin derivative-modified silicone or composition thereof is added.

9. The production method according to claim 6 , wherein, in the liquid oil agent addition step, the opaque liquid glycerin derivative-modified silicone or composition thereof and/or the transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition is mixed with the liquid oil agent to homogenize.

10. The production method according to claim 1 , wherein the liquid glycerin derivative-modified silicone or composition thereof is treated with an acidic aqueous solution, and water and odor-causing substances produced by treatment with the acidic aqueous solution are removed by heating or depressurization.

11. A transparent or semi-transparent uniform liquid glycerin derivative-modified silicone composition obtained by the production method according to claim 1 .

12. An external use preparation, cosmetic, or industrial material comprising the transparent or semi-transparent uniform liquid glycerin derivative-modified silicone composition according to claim 11 .

13. The production method according to claim 1 , further comprising, before and after and simultaneously with the hydration step, a liquid oil agent addition step of adding a liquid oil agent to the opaque liquid glycerin derivative-modified silicone or composition thereof and/or the transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition.

14. The production method according to claim 1 , further comprising, before or after, and simultaneously, with the hydration step, a liquid oil agent addition step of adding a liquid oil agent to the opaque liquid glycerin derivative-modified silicone or composition thereof and/or the transparent or semi-transparent liquid uniform glycerin derivative-modified silicone composition.

15. The production method according to claim 1 , wherein R 2 is a monovalent hydrocarbon group having from 9 to 30 carbon atoms.