Treatments and kits for creating transparent renewable surface protective coatings
View Patent ↗Methods, treatment compositions and treatment systems are disclosed for forming a detachable and renewable coating on a receptive surface by a process of applying a treatment composition comprising a plurality of hydrophobically modified fumed silica particles colloidally dispersed in a volatile solvent; allowing the volatile solvent to evaporate; and thereby depositing a protective coating on the receptive surface consisting of a layer of the hydrophobically modified particles, which provide a substantially transparent coating with dirt- and water-repellency properties that effectively shed dry particulate soils as well as water from the treated surface or treated article bearing a receptive surface. The methods, treatment compositions and treatment systems employing the hydrophobically modified fumed silica particle are particularly useful in providing nearly invisible detachable coatings and treated articles featuring surface protective benefits including dirt- and water-repellency, self-cleaning with water, and easier cleaning benefits when applied to a variety of automotive and home surfaces, both interior and exterior, including articles and materials such as metals, painted materials, sealed materials, plastics and polymeric articles, wood, textiles and the like.
1. A treatment composition for forming a hydrophobic, dirt-repellent, and water-repellent coating comprising:
(a) a plurality of particles colloidally dispersed in a volatile solvent,
(b) optionally, a surfactant; and
(c) optionally, water
wherein the volatile solvent is greater than 50% by weight of the treatment composition and water is less than 5% by weight of the treatment composition; and
wherein said treatment composition is formed by creating a pre-dispersion comprising hydrophobically modified fumed silica particles obtained by a process comprising the steps of:
(a) providing a pre-dispersion of silica particles comprising hydrophobically modified fumed silica particles by stirring said silica particles into a solution comprising:
(i) at least one compound of general formula (I) or (II):
(R1R2R3Si)2NR4 (I)
—(R1R2SiNR4) m -(cyclo) (II)
wherein R1, R2 and R3 can be the same or different, and are independently selected from hydrogen, straight or branched, saturated or unsaturated alkyl chain groups of from 1 to 8 carbon atoms, or aromatic groups of from 6 to 12 carbon atoms, R4 is hydrogen or a methyl group, and m is from 3 to 8; and
(ii) said volatile solvent or a solvent mixture; and
(b) mixing with a disperser said pre-dispersion to provide a process composition while reducing said silica particles to a median particle size in the range between 100 and 4000 nanometers; wherein said treatment composition forms a coating on a receptive surface that creates a high contact angle for repelling water and dirt and wherein the coating is substantially transparent and results in a change of less than 3.0 Delta E units to said receptive surface measured before and after deposition of said coating.
2. The treatment composition of claim 1 , wherein said treatment composition further comprises a propellant.
3. The treatment composition of claim 1 , wherein said treatment composition further comprises a polymer selected from the group consisting of: anionic polymers, cationic polymers, nonionic polymers and any combinations thereof.
4. The treatment composition of claim 3 , wherein said polymer comprises an acrylate polymer.
5. The treatment composition of claim 1 , wherein said volatile solvent is selected from the group consisting of: aromatic, branched, cyclic and linear hydrocarbons with 2 to 14 carbon atoms.
6. The treatment composition of claim 1 , wherein said volatile solvent is selected from the group consisting of: monovalent linear and branched alcohols with 1 to 6 carbon atoms.
7. The treatment composition of claim 1 , wherein said composition comprises a solvent mixture.
8. The treatment composition of claim 1 , wherein said volatile solvent is selected from the group consisting of: linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units.
9. The treatment composition of claim 1 , wherein said treatment composition further comprises a surfactant.
10. A treatment composition for forming a hydrophobic, dirt-repellent, and water-repellent coating comprising:
(a) a pre-dispersion of silica particles comprising hydrophobically modified fumed silica particles by stirring said silica particles into a solution comprising:
(i) at least one compound of general formula (I) or (II):
(R1R2R3Si)2NR4 (I)
—(R1R2SiNR4) m -(cyclo) (II)
wherein R1, R2 and R3 can be the same or different, and are independently selected from hydrogen, straight or branched, saturated or unsaturated alkyl chain groups of from 1 to 8 carbon atoms, or aromatic groups of from 6 to 12 carbon atoms, R4 is hydrogen or a methyl group, and m is from 3 to 8; and
(ii) a first volatile solvent or solvent mixture, wherein the first volatile solvent or the solvent mixture is greater than 50% by weight of the treatment composition; and
wherein said treatment composition forms a coating on a receptive surface that has high contact angle for repelling water and dirt and wherein the coating is substantially transparent and results in a change of less than 3.0 Delta E units to said receptive surface measured before and after deposition of said coating.
11. The composition of claim 10 wherein said treatment composition further comprises at least one durability agent selected from alkoxysilanes of general formula (III)
R5 a Si(OR6)4- a (III)
wherein R5 is a straight or branched, saturated or unsaturated alkyl chain group of from 1 to 16 carbon atoms, optionally substituted with fluorine atoms, hydroxyl, amino, mercapto, or epoxy groups, R6 is an alkyl chain of 1 to 2 carbon atoms, and a is 1 or 2; or alkyl-modified linear or cyclic polydimethylsiloxanes of general formula (IV) or (V)
(CH3)3SiO[(CH3)2SiO] n [(CH3)R7SiO] o Si(CH3)3 (IV)
—[(CH3)2SiO] p [(CH3)R7SiO] q -(cyclo) (V)
wherein R7 is an alkyl chain group of from 6 to 24 carbon atoms, n is from 1 to 100, o is from 1 to 40, p from 0 to 7, and q is from 1 to 7, provided that the sum (p+q) is at least 3; whereby the concentration of any one of the durability agents (III) and/or (IV) and/or (V) is between 0.1 and 10 percent by weight of the total weight of the pre-dispersion.
12. The treatment composition of claim 10 , wherein said treatment composition further comprises a propellant.
13. The treatment composition of claim 10 , wherein said treatment composition further comprises a polymer selected from the group consisting of: anionic polymers, cationic polymers, nonionic polymers and any combinations thereof.
14. The treatment composition of claim 10 , wherein said polymer comprises an acrylate polymer.
15. The treatment composition of claim 10 , wherein said first volatile solvent is selected from the group consisting of: aromatic, branched, cyclic and linear hydrocarbons with 2 to 14 carbon atoms.
16. The treatment composition of claim 10 , wherein said first volatile solvent is selected from the group consisting of: monovalent linear and branched alcohols with 1 to 6 carbon atoms.
17. The treatment composition of claim 10 , wherein said first volatile solvent is selected from the group consisting of: linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units.
18. A treatment composition for forming a hydrophobic, dirt-repellent, and water-repellent coating comprising:
(a) a pre-dispersion of silica particles comprising hydrophobically modified fumed silica particles by stirring said silica particles into a solution comprising:
(i) at least one compound of general formula (I) or (II):
(R1R2R3Si)2NR4 (I)
—(R1R2SiNR4) m -(cyclo) (II)
wherein R1, R2 and R3 can be the same or different, and are independently selected from hydrogen, straight or branched, saturated or unsaturated alkyl chain groups of from 1 to 8 carbon atoms, or aromatic groups of from 6 to 12 carbon atoms, R4 is hydrogen or a methyl group, and m is from 3 to 8; and
(ii) a volatile solvent, wherein the volatile solvent is greater than 50% by weight of the treatment composition; and
(b) an acrylate polymer; and
wherein the treatment composition forms a coating on a receptive surface that has high contact angle for repelling water and dirt and the coating is substantially transparent and results in a change of less than 3.0 Delta E units to said receptive surface measured before and after deposition of said coating.
19. The treatment composition of claim 18 wherein said treatment composition further comprises at least one durability agent selected from alkoxysilanes of general formula (III)
R5 a Si(OR6)4- a (III)
wherein R5 is a straight or branched, saturated or unsaturated alkyl chain group of from 1 to 16 carbon atoms, optionally substituted with fluorine atoms, hydroxyl, amino, mercapto, or epoxy groups, R6 is an alkyl chain of 1 to 2 carbon atoms, and a is 1 or 2; or alkyl-modified linear or cyclic polydimethylsiloxanes of general formula (IV) or (V)
(CH3)3SiO[(CH3)2SiO] n [(CH3)R7SiO] o Si(CH3)3 (IV)
—[(CH3)2SiO] p [(CH3)R7SiO] q -(cyclo) (V)
wherein R7 is an alkyl chain group of from 6 to 24 carbon atoms, n is from 1 to 100, o is from 1 to 40, p from 0 to 7, and q is from 1 to 7, provided that the sum (p+q) is at least 3; whereby the concentration of any one of the durability agents (III) and/or (IV) and/or (V) is between 0.1 and 10 percent by weight of the total weight of the pre-dispersion.