Rheologically stabilized silicone dispersions comprising a polydimethylsiloxane mixture
View Patent ↗Aqueous dispersions of silicone oils are prepared without the need for surfactants, solvents, hydrotropes or emulsifiers by employing water soluble and/or water dispersible polymers providing inventive compositions which exhibit a rheological Critical Strain value greater than zero and less than about 0.5. Disclosed according to the present invention are compositions and methods of use of the aqueous dispersions of silicone fluids for cleaning, preserving, protecting, and otherwise treating a variety of surfaces, including household surfaces, such as floors, counter tops, furniture, walls, and automotive surfaces, such as tires, rubber, vinyl, upholstery, fabric, plastic and general elastomer surfaces.
1. An aqueous dispersion comprising:
i. an organopolysiloxane fluid comprising at least two polydimethylsiloxanes with different viscosities;
ii. a polymer selected from the group consisting of methylcellulose, hydroxypropyl methyl cellulose, hydroxypropyl ethyl cellulose, dextrin, maltodextrin, polyvinyl alcohol, polyvinyl alcohol copolymers, xanthan gum, starch and mixtures thereof;
iii. an additional polymer selected from the group consisting of polyacrylate polymers and copolymers which have a molecular weight of about 5,000 to about 5,000,000 g/mol;
iv. at least 95 percent by weight water; and
v. a propellant.
2. The aqueous dispersion of claim 1 , wherein said polyorganosiloxane fluid comprises at least one silicone oil having the general formula:
(RnSiO((4−n)/2))m;
wherein n is between 0 and 3 and; wherein m is 2 or greater; and wherein R is selected from the group consisting of alkyl, alkylene, allyl, aryl, benzyl, phenyl, amine, amide, vinyl, fluoroalkyl, perfluoroalkane, carboxyester and quaternary alkyl ammonium radicals, and mixtures thereof.
3. The aqueous dispersion of claim 2 , wherein at least one polydimethylsiloxane has a fluid viscosity of between about 1 centistokes and about 4,000,000 centistokes.
4. The aqueous dispersion of claim 2 , wherein m is between 2 and about 5000.
5. The aqueous dispersion of claim 2 , wherein said polyorganosiloxane fluid comprises a volatile silicone fluid with a viscosity of less than 10 centistokes at 25° C.
6. The aqueous dispersion of claim 1 , wherein said polyorganosiloxane fluid is present at a level between about 0.01 weight percent and 20 weight percent of said composition aqueous dispersion.
7. The aqueous dispersion of claim 1 , wherein said additional polymer is selected from the group consisting of polyacrylate polymers and copolymers containing at least one acrylate monomer, water swellable and alkali swellable polyacrylate polymers and copolymers containing at least one acrylate monomer, non-linear polyacrylate polymers cross-linked with at least one polyalkenyl polyether monomer, film-forming and water swellable non-soluble polyacrylate polymers, hydrophobically modified cross-linked polyacrylate polymers and copolymers containing at least one hydrophobic monomer, water dispersible associative and non-associative polyacrylate polymers and copolymers containing at least one acrylate monomer, and mixtures thereof.
8. The aqueous dispersion of claim 1 , wherein said polymer and additional polymer together, are present at a level between about 0.0001 weight percent and 10 weight percent of said composition aqueous dispersion.
9. The aqueous dispersion of claim 1 , wherein said polymer and additional polymer together, are present at a level between about 0.001 weight percent and 5 weight percent of said composition aqueous dispersion.
10. The aqueous dispersion of claim 1 , wherein said polymer and additional polymer together, are present at a level between about 0.01 weight percent and 1 weight percent of said composition aqueous dispersion.
11. The aqueous dispersion of claim 1 , wherein said weight ratio of said polyorganosiloxane fluid (a) to said polymer and additional polymer together (b) is between 500:1 (a:b) and 1:1.
12. The aqueous dispersion of claim 1 , wherein said weight ratio of said polyorganosiloxane fluid (a) to said polymer and additional polymer together (b) is between about 250:1 to about 1:1.
13. The aqueous dispersion of claim 1 , wherein said weight ratio of said polyorganosiloxane fluid (a) to said polymer and additional polymer together (b) is between about 100:1 to about 1:1.
14. The aqueous dispersion of claim 1 , wherein said aqueous dispersion further comprises a thickener at a level of about 0.01 percent to about 10 percent by weight of the aqueous dispersion.
15. The aqueous dispersion of claim 1 , wherein said aqueous dispersion further comprises a thickener at a level of about 0.10 percent to about 10 percent by weight of the aqueous dispersion.
16. The aqueous dispersion of claim 1 , wherein said aqueous dispersion further comprises a thickener at a level of about 0.01 percent to about 5 percent by weight of the aqueous dispersion.
17. The aqueous dispersion of claim 1 , further comprising optional adjuncts selected from the group consisting of solvents, surfactants, surface wetting agents, spreading agents, stabilizers, ultraviolet absorbers, ultraviolet light scatterers, ultraviolet blockers, hindered amine light stabilizers, free radical inhibitors, excited state quenchers, pigments, dyes, coloring agents, preservatives, microbiocides, fungicides, plasticizers, buffers, pH adjusting acids, bases and their conjugate salts, fragrances, polishes, abrasives, wax, lubricants, thickening agents, nanoparticulate materials and mixtures thereof.
18. A method of cleaning, preserving, protecting and otherwise treating a surface, comprising the steps of:
i. applying an effective amount of an aqueous dispersion to said surface, wherein said surface comprises a surface selected from the group consisting of a hard surface, an elastomeric surface, a painted surface, a metal surface and combinations thereof;
ii. distributing said aqueous dispersion onto said surface with an application implement;
wherein said aqueous dispersion comprises:
a. an organopolysiloxane fluid comprising at least two polydimethylsiloxanes with different viscosities;
b. a water soluble or water dispersible polymer;
c. at least 95 percent by weight water;
d. an additional polymer selected from the group consisting of polyacrylate polymers and copolymers which have a molecular weight of about 5,000 to about 5,000,000 g/mol; and
e. a propellant;
and wherein said aqueous dispersion, in the absence of a propellant, exhibits a rheological Critical Strain value greater than zero and less than about 0.5 and an Elastic Modulus value greater than zero and less than about 400 Pascals.
19. A method according to claim 18 wherein said application implement comes into direct contact with said surface, and wherein said application implement is selected from the group consisting of a wipe, woven substrate, non-woven substrate, sponge, towelette, pad, foam and/or porous material and/or combination, and wherein said application implement is substantially wetted by said aqueous dispersion.
20. A method according to claim 18 wherein said application implement does not come into direct contact with said surface, and wherein said application implement is selected from the group consisting of a spray device, atomizing device, aerosol device, foam generating device, electrostatic spray device, nebulizer device and/or device and or combinations thereof that produces liquid droplets of said aqueous dispersion, and wherein said application implement is capable of applying said liquid droplets onto said surface.
21. A method according to claim 18 further comprising the step (iii) of removing excess aqueous dispersion form the surface following step (i) or step (ii).
22. A method according to claim 21 whereby said step (iii) of removing excess aqueous dispersion from the surface comprises use of said application implement.
23. A method according to claim 21 whereby said step (iii) of removing excess aqueous dispersion form the surface comprises the use of an aqueous rinse comprising water.
24. A method according to claim 21 further comprising the step (iv) of rinsing said surface with an aqueous rinse comprising water.