Emulsions of aminofunctional silicones
View Patent ↗Aminofunctional silicone emulsions are prepared by forming a mixture of A) 100 parts of a polydialkylsiloxane Having a viscosity of at least 50,000 mm/s at 23° C., and B) 0.1 to 100 parts of an aminofunctional organopolysiloxane, admixing C) 0.1 to 50 parts of a halide free quaternary ammonium surfactant containing at least 10 carbon atoms, and a sufficient amount of water to form an emulsion.
1. A process for preparing an aminofunctional silicone emulsion comprising:
I) forming a mixture of:
A) 100 parts of a polydialkylsiloxane having a viscosity of at least 50,000 mm 2 /s at 23° C., and
B) 0.1 to 100 parts of an aminofunctional organopolysiloxane,
II) admixing:
C) 0.1 to 50 parts of a halide free quaternary ammonium surfactant containing at least 10 carbon atoms, and
a sufficient amount of water to form an emulsion,
III) optionally, further shear mixing the emulsion,
wherein the parts are per 100 parts of A), and wherein the emulsion has a particle size of between 1 and 10 μm and the emulsion has each of octamethylcyclotetrasiloxane (D 4 ) and decamethylcyclopentasiloxane (D 5 ) content less than 1 wt % of the emulsion.
2. The process of claim 1 wherein the polydialkylsiloxane is a trimethylsiloxy terminated polydimethylsiloxane having a viscosity of at least 100,000 mm 2 /s at 23° C.
3. The process of claim 1 wherein the aminofunctional organopolysiloxane has the average formula:
[R 3 SiO 1/2 ][R 2 SiO 2/2 ] a [RR N SiO 2/2 ] b [R 3 SiO 1/2 ]
where;
a is 1-1000, b is 1-100,
R is independently a monovalent organic group, and
R N is an amino functional group.
4. The process of claim 3 wherein R is methyl and the amino functional group is
—CH 2 CH(CH 3 )CH 2 NHCH 2 CH 2 NH 2 .
5. The process of claim 1 wherein the halide free quaternary ammonium surfactant has the formula:
R 5 a R 6 (4-a) N + X − , wherein
a varies from 1 to 4,
R 5 is an organic group containing at least 10 carbon atoms,
R 6 is independently a hydrocarbon group containing 1 to 20 carbon atoms, and
X is a halide free counter ion.
6. The process of claim 5 where R 5 is lauryl, cetyl, coco, stearyl, tallow, cocoyl, lauroyl, palmitoyl, myristoyl or stearoyl.
7. The process of claim 6 where R 6 is methyl or ethyl.
8. The process of claim 6 where X is methosulfate, etho-sulfate, acetate, tosylate, phosphate, or nitrate.
9. The process of claim 1 wherein step II) further comprises adding D) a nonionic surfactant.
10. The process of claim 9 wherein the nonionic surfactant is an alkyl polyethylene glycol ether based on C10-Guerbet alcohol.
11. An aminofunctional silicone emulsion produced by the method of claim 1 , wherein the emulsion has a particle size of between 1 and 10 μm and the emulsion has each of octamethylcyclotetrasiloxane (D 4 ) and decamethylcyclopentasiloxane (D 5 ) content less than 1 wt % of the emulsion.
12. A personal care composition comprising the aminofunctional silicone emulsion of claim 11 .