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 detachable and renewable protective coating on a receptive surface comprising:
(i) 0.05 to 5.0 percent by weight of a plurality of hydrophobically modified fumed silica particles having a median particle size of between 100 and 4,000 nanometers;
(ii) 99.95 to 5 percent by weight of a volatile solvent;
(iii) optionally, 0.001 to 5 percent by weight of a suspending agent;
(iv) optionally, 0.001 to 5 percent by weight of a functional adjunct; and
(v) optionally, in balance to 100 percent by weight if present, a propellant;
wherein said treatment composition when applied to said receptive surface deposits said protective coating on said receptive surface, wherein said protective coating provides dirt- and water-repellency to said receptive surface, and wherein said 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; and
wherein said treatment composition is obtained by dilution of a process composition comprising the plurality of 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) the volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units, wherein the concentration of the hydrophobically modified fumed silica particles in the pre-dispersion results in from 10 percent to about 30 percent by weight of the total weight of the pre-dispersion, and wherein the concentration of any one of compounds (I) and/or (II) is between 0.1 and 10 percent by weight of the total weight of the pre-dispersion; 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; and
(c) optionally adding a durability agent to said solution at step (a) and/or with step (b), wherein said durability agent is 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 formulas (IV) or (V)
(CH3)3SiO[(CH3)2SiO]n[(CH3)R7SiO]oSi(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, to the dispersion as obtained in step (b) or step (c), whereby the concentration of any one of the durability agents (III) and/or (IV) and/or (V) is between 0.01 and 10 percent by weight of the total weight of the process composition.
2. The treatment composition of claim 1 , wherein said volatile solvent is selected from the group of aromatic, branched, cyclic, and/or linear hydrocarbons with 2 to 14 carbon atoms, optionally substituted with fluorine or chlorine atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, aldehydes and ketones, ethers or esters with 2 to 8 carbon atoms, linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units, and mixtures thereof.
3. The treatment composition of claim 1 , wherein said suspending agent is selected from the group consisting of polymers, surfactants, and mixtures thereof.
4. The treatment composition of claim 1 , wherein said functional adjunct is selected from the group consisting of ultraviolet light absorbers, ultraviolet light blockers, free-radical scavengers, fluorescent whitening agents, colorants, dyes, pigments, photoactive particles, color changing dyes, color fading dyes, bleaching agents, fixative agents, spreading agents, evaporation modifiers, azeotropic cosolvents, stabilizers, perfume, fragrance, odor control agents, anti-static agents, thickeners, and mixtures thereof.
5. The treatment composition of claim 1 , wherein said receptive surface comprises a non-porous substrate, porous substrate, and combinations thereof; wherein said detachable coating on said non-porous substrate results in a change of less than 3.0 Delta E units of said surface of said non-porous substrate after application of said coating; and wherein said protective coating on said porous substrate results in a change of less than either (a) 3.0 Delta E units and/or (b) 3.0 Delta L units of said surface of said porous substrate after application of said coating.
6. The treatment composition as in claim 1 wherein said treatment composition is obtained by a dilution step employing a second solvent added to a process composition comprising:
(a) 5 to 30 percent by weight of hydrophobically modified fumed silica particles with a median particle size in the range between 100 and 4000 nanometers; and
(b) 50 to 95 percent by weight of a first volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units;
wherein said dilution step results in less than 5 percent by weight of said hydrophobically modified fumed silica particles in said treatment composition; wherein said second solvent comprises a volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units.
7. A treatment composition for forming a detachable and renewable protective coating on a receptive surface comprising:
(a) 0.05 to 5.0 percent by weight of a plurality of hydrophobically modified fumed silica particles having a median particle size of between 100 and 4,000 nanometers;
(b) 99.95 to 5 percent by weight of a volatile solvent;
(c) optionally, 0.001 to 5 percent by weight of a suspending agent;
(d) optionally, 0.001 to 5 percent by weight of a functional adjunct; and
(e) optionally, in balance to 100 percent by weight if present, a propellant;
wherein said treatment composition when applied to said receptive surface deposits said protective coating on said receptive surface, wherein said protective coating provides dirt- and water-repellency to said receptive surface, and wherein said coating is substantially transparent and results in a change of less than 250 Delta Haze units to said receptive surface measured before and after deposition of said coating, as measured by the Chrome Test; and
wherein said treatment composition is obtained by dilution of a process composition comprising the plurality of 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) the volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units, wherein the concentration of the hydrophobically modified fumed silica particles in the pre-dispersion results in from 10 percent to about 30 percent by weight of the total weight of the pre-dispersion, and wherein the concentration of any one of compounds (I) and/or (II) is between 0.1 and 10 percent by weight of the total weight of the pre-dispersion.
8. The treatment composition of claim 7 , wherein said hydrophobically modified fumed silica particles have a median particle size of less than 2,000 nanometers and wherein said coating results in a change of less than 200 Delta Haze units.
9. The treatment composition of claim 7 , wherein said hydrophobically modified fumed silica particles have a median particle size of less than 1,000 nanometers and wherein said coating results in a change of less than 100 Delta Haze units.
10. The treatment composition as in claim 7 wherein said treatment composition is obtained by a dilution step employing a second solvent added to a process composition comprising:
(a) 5 to 30 percent by weight of hydrophobically modified fumed silica particles with a median particle size in the range between 100 and 4000 nanometers; and
(b) 50 to 95 percent by weight of a first volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units;
wherein said dilution step results in less than 5 percent by weight of said hydrophobically modified fumed silica particles in said treatment composition; wherein said second solvent comprises a volatile solvent or solvent mixture selected from straight or branched, linear or cyclic aliphatic, or aromatic hydrocarbons with 2 to 14 carbon atoms, monovalent linear or branched alcohols with 1 to 6 carbon atoms, ketones or aldehydes with 1 to 6 carbon atoms, ethers or esters with 2 to 8 carbon atoms, or linear or cyclic polydimethylsiloxanes with 2 to 10 dimethylsiloxy units.