Pituitous silicone fluids
View Patent ↗Personal care compositions containing pituitous silicone fluids compositions are disclosed. The silicone fluid compositions contain certain branched and/or high molecular weight organopolysiloxanes that demonstrate pituitous rheological behavior. When formulated into personal care compositions, the silicone fluids provide enhanced sensory and film-forming properties based on their pituitous rheological properties.
1. A personal care composition comprising a silicone fluid having pituitous rheological properties wherein the silicone fluid comprises a highly branched organopolysiloxane prepared by reacting;
a′) an organohydrogencyclosiloxane having the formula [(CH 3 )HSiO] g where g is 3 to 8, and
b′) a vinyl terminated polydimethylsiloxane having the average formula (CH 2 ═CH)Me 2 SiO(Me 2 SiO) dp SiMe 2 (CH═CH 2 ) having a degree of polymerization (dp) of 4000 to about 4800,
in a carrier fluid and in the presence of a hydrosilylation catalyst where the amount of a′) and b′) in the reaction is such to provide a molar ratio of vinyl to SiH of 0.9/1 to 1.2/1, and a solids content of at least 5 wt %,
wherein the pituitous rheological properties of the silicone fluid are determined from a plot of normal force in Pascals vs a perpendicular shear rate in sec −1 wherein the plot falls above a limit line having the equation y=3.6x where y is the normal force and x is the perpendicular shear rate, and
wherein the carrier fluid is a hydrocarbon solvent.
2. The personal care composition according to claim 1 , wherein g is 4 to 6.
3. The personal care composition according to claim 1 , wherein g is 4.
4. The personal care composition according to claim 1 , wherein the molar ratio of vinyl to SiH is 0.95/1 to 1.1/1.
5. The personal care composition according to claim 1 , wherein the solids content is at least 10 wt %.
6. The personal care composition according to claim 1 , wherein the solids content is at least 20 wt %.
7. The personal care composition according to claim 1 , wherein the hydrocarbon solvent comprises an aromatic hydrocarbon solvent or an aliphatic hydrocarbon solvent.
8. The personal care composition according to claim 7 , wherein the hydrocarbon solvent comprises a C11-C13 isoparaffin.
9. The personal care composition according to claim 1 , wherein the hydrosilylation catalyst is a platinum catalyst.
10. A personal care composition comprising a silicone fluid having pituitous rheological properties wherein the silicone fluid comprises a highly branched organopolysiloxane prepared by reacting;
a′) an organohydrogencyclosiloxane having the formula [(CH 3 )HSiO] g where g is 3 to 8, and
b′) a vinyl terminated polydimethylsiloxane having the average formula (CH 2 ═CH)Me 2 SiO(Me 2 SiO) dp SiMe 2 (CH═CH 2 ) having a degree of polymerization (dp) of 4000 to 9000,
in a carrier fluid and in the presence of a hydrosilylation catalyst where the amount of a′) and b′) in the reaction is such to provide a molar ratio of vinyl to SiH of 0.9/1 to 1.2/1, and a solids content of at least 5 wt %,
wherein the pituitous rheological properties of the silicone fluid are determined from a plot of normal force in Pascals vs a perpendicular shear rate in sec −1 wherein the plot falls above a limit line having the equation y=3.6x where y is the normal force and x is the perpendicular shear rate, and
wherein the carrier fluid is a hydrocarbon solvent.
11. The personal care composition according to claim 10 , wherein the dp is 4000 to 6000.
12. The personal care composition according to claim 10 , wherein g is 4 to 6.
13. The personal care composition according to claim 10 , wherein g is 4.
14. The personal care composition according to claim 10 , wherein the molar ratio of vinyl to SiH is 0.95/1 to 1.1/1.
15. The personal care composition according to claim 10 , wherein the solids content is at least 10 wt %.
16. The personal care composition according to claim 10 , wherein the solids content is at least 20 wt %.
17. The personal care composition according to claim 10 , wherein the hydrocarbon solvent comprises an aromatic hydrocarbon solvent or an aliphatic hydrocarbon solvent.
18. The personal care composition according to claim 17 , wherein the hydrocarbon solvent comprises a C11-C13 isoparaffin.
19. The personal care composition according to claim 10 , wherein the hydrosilylation catalyst is a platinum catalyst.