Method of preparing emulsions containing elastomeric silanes and siloxanes having quaternary ammonium groups
View Patent ↗Oil-in-water (O/W) and water-in-oil (W/O) emulsions and microemulsions containing elastomeric silanes or siloxanes preferably having quaternary ammonium groups are generally made by reacting organic quaternary ammonium compounds having epoxide groups or halohydrin groups, with silanes or siloxanes having amino groups. The reaction is carried out in an aqueous polar phase containing a crosslinking agent and surfactant. The emulsions and microemulsions are especially useful for treating hair, skin, or the underarm.
1. A method of making oil-in-water (O/W) and water-in-oil (W/O) emulsions and microemulsions containing elastomeric silanes or siloxanes having quaternary ammonium groups in their molecule as the oil phase of the emulsion or microemulsion, comprising reacting (i) an organic quaternary ammonium compound having epoxide groups or halohydrin groups in its molecule, with (ii) a silane or siloxane having amino groups in its molecule, in the presence of (iii) a crosslinking agent, and (iv) a surfactant, dispersed in (v) an aqueous polar phase.
2. A method according to claim 1 in which the organic quaternary ammonium compound having epoxide groups is glycidyl trimethylammonium chloride or glycidyl trimethylammonium bromide.
3. A method according to claim 1 in which the organic quaternary ammonium compound having halohydrin groups is selected from the group consisting of
(3-chloro-2-hydroxypropyl)trimethylammonium chloride,
(3-chloro-2-hydroxypropyl)dimethyldodecylammonium chloride,
(3-chloro-2-hydroxypropyl)dimethyloctadecylammonium chloride,
(3-chloro-2-hydroxypropyl)trimethylammonium bromide,
(3-chloro-2-hydroxypropyl)dimethyldodecylammonium bromide, and
(3-chloro-2-hydroxypropyl)dimethyloctadecylammonium bromide.
4. A method according to claim 1 in which the aqueous polar phase consists of water.
5. A method according to claim 1 in which the aqueous polar phase comprises water and a polar organic compound.
6. A method according to claim 5 in which the polar organic compound is selected from the group consisting of monohydroxy alcohols, diols, triols, glycerol esters, and polyglycols.
7. A method according to claim 1 in which the crosslinking agent is selected from the group consisting of organic epoxides containing at least two epoxy groups, epoxy functional silicones containing at least two epoxy groups, chlorohydrins, hydroxyalkyl acrylates, and isocyanates.