Easy-to-clean coatings with low fingerprint visibility

Abstract

The present invention relates to a method for producing a thin film on a substrate from a composition comprising a polysiloxane comprising silane monomers according to formulae (I) and (II) as defined below; an article, preferably an article having a coated metal or anodized aluminum surface, comprising a thin film obtainable by said method; a composition comprising said polysiloxane, the polysiloxane comprising at least two silane monomers according to formulae (I) and (II); and the use of the composition for producing a coating on an article.

Description

Easy-clean coating with low fingerprint visibility Technical Field

[0001] The present invention relates to a method for preparing a thin film on a substrate from a composition comprising a polysiloxane comprising a silane monomer according to formulas (I) and (II) as defined below; an article, preferably having a coated metal or anodized aluminum surface, comprising a thin film obtainable by the method; a composition comprising the polysiloxane comprising at least two silane monomers according to formulas (I) and (II); and the use of the composition for preparing a coating on an article. Background Technology

[0002] For many applications, such as touch panel displays, tablets and laptops, mobile phone cases and covers, console panels, home appliances, kitchen and other work surfaces, solar panel screens and windows, it is important to keep surfaces clean and stained for hygiene and visual appeal reasons, as well as to be able to use the equipment at its best potential.

[0003] Humans naturally secrete sebum and other oily substances from their face and fingertips. These sebum and oily substances deposit on surfaces of polymeric materials such as ceramics, glass, metals, natural and artificial stone, and any kind of products (such as displays and device housings and covers). On surfaces with applications such as those mentioned above, the oily substances are often visible and can degrade the surface's aesthetic quality or even its technical quality, for example, by reducing the quality of images seen on a display.

[0004] Invisible fingerprint (IFP) coatings are typically oleophilic coatings, which allow oily substances, such as those from fingerprints, to spread along the surface. These oily substances do not reflect light and appear transparent, thus being invisible or nearly invisible. In contrast, on more hydrophilic coatings with a considerably high oil contact angle (OCA), the oily substances form droplets that reflect light and make the fingerprint appear white. Especially on dark surfaces (such as displays), transparent fingerprints that appear black rather than white are preferred because black fingerprints contribute more to invisibility compared to white fingerprints.

[0005] The invisible fingerprint coating should possess sufficient hydrophobicity, indicated by water contact angle (WCA) and oil contact angle (OCA), to allow oily substances, such as those from fingerprints, to spread along the surface and to facilitate cleaning (E2C). Furthermore, the invisible fingerprint coating should exhibit good abrasion and wear resistance and stability against common chemicals that may come into contact with the coating. Additionally, the coating should possess sufficient thermal stability, UV stability, and stability against varying environmental conditions, such as high humidity and high temperature. Finally, the coating must be applicable using standard industrial coating techniques.

[0006] The present invention relates to the discovery of polysiloxane coatings on surfaces based on specifically selected silane monomers that surprisingly exhibit excellent IFP properties (where fingerprints are transparent and appear black on dark surfaces, resulting in extremely low visibility), good easy-to-clean (E2C) properties, and high abrasion and chemical resistance. Furthermore, the polysiloxane coating can be applied as a single-layer coating to the surface of an article. Finally, the present invention provides a method for producing fluorine-free films on the surface of articles. Summary of the Invention

[0007] In a first aspect, the present invention relates to a method for preparing a thin film on a substrate, the method comprising the following steps:

[0008] a) Mixing at least two different silane monomers into a first solvent to form a mixture.

[0009] The condition is

[0010] The first silane monomer is selected from compounds of formula (I).

[0011] Si(OR 1 )4(I)

[0012] in

[0013] R 1 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0014] The second silane monomer is selected from compounds of formula (II).

[0015] Ar-Si(R 2 ) a (OR 3 ) 3-a (II)

[0016] in

[0017] Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthracenyl and phenanthryl, more preferably unsubstituted phenyl;

[0018] R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably straight-chain or branched alkyl groups with 1 or 2 carbon atoms;

[0019] R 3 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0020] a is 0 or 1, preferably 1;

[0021] b) In the presence of a catalyst, at least partially hydrolyze the silane monomers and at least polymerize the silane monomers according to formulas (I) and (II) to obtain a composition comprising a polysiloxane comprising silane monomers according to formulas (I) and (II).

[0022] c) Optionally, the first solvent can be replaced with a second solvent;

[0023] d) The composition obtained in step c), if present, or in step b), forms a thin layer on the substrate;

[0024] e) After step d), optionally remove the solvent partially or completely, if present;

[0025] f) If step e) exists, then solidify the intermediate product obtained in step e), or if step e) does not exist, then solidify the intermediate product obtained in step d) to obtain a film.

[0026] In another aspect, the present invention relates to an article, preferably an article having a coated metal or anodized aluminum surface, the article comprising a film obtainable by means as defined above or below as at least one surface of the article, preferably a coating on the coated metal or anodized aluminum surface.

[0027] In another aspect, the present invention relates to a composition comprising a polysiloxane comprising at least two silane monomers according to formulas (I) and (II):

[0028] Si(OR 1 )4(I)

[0029] in

[0030] R 1Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0031] Ar-Si(R 2 ) a (OR 3 ) 3-a (II)

[0032] in

[0033] Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl and phenanthrene, more preferably unsubstituted phenyl;

[0034] R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably straight-chain or branched alkyl groups with 1 or 2 carbon atoms;

[0035] R 3 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0036] a can be 0 or 1, preferably 1.

[0037] In another aspect, the present invention relates to the use of compositions as described above or below for preparing coatings on articles of manufacture, preferably for preparing invisible fingerprint coatings on articles of manufacture.

[0038] The resulting coating provides good IFP performance (where fingerprints appear black), high abrasion resistance, and excellent surface cleanability. Detailed Implementation

[0039] In a first aspect, the present invention relates to a method for preparing a thin film on a substrate, the method comprising the following steps:

[0040] a) Mixing at least two different silane monomers into a first solvent to form a mixture.

[0041] The condition is

[0042] The first silane monomer is selected from compounds of formula (I).

[0043] Si(OR 1 )4(I)

[0044] in

[0045] R 1Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0046] The second silane monomer is selected from compounds of formula (II).

[0047] Ar-Si(R 2 ) a (OR 3 ) 3-a (II)

[0048] in

[0049] Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl and phenanthrene, more preferably unsubstituted phenyl;

[0050] R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably straight-chain or branched alkyl groups with 1 or 2 carbon atoms;

[0051] R 3 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0052] a is 0 or 1, preferably 1;

[0053] b) In the presence of a catalyst, at least partially hydrolyze the silane monomers and at least polymerize the silane monomers according to formulas (I) and (II) to obtain a composition comprising a polysiloxane comprising silane monomers according to formulas (I) and (II).

[0054] c) Optionally, the first solvent can be replaced with a second solvent;

[0055] d) The composition obtained in step c) (if present) or step b) forms a thin layer on the substrate;

[0056] e) After step d), optionally remove the solvent partially or completely, if present;

[0057] f) Curing the intermediate product obtained in step e) (if present), or curing the intermediate product obtained in step d) if step e) is absent, thereby obtaining a film.

[0058] The “different” in this context refers to the fact that the silane monomers differ in at least one chemical part.

[0059] The first silane monomer is selected from compounds of formula (I).

[0060] Si(OR 1 )4(I)

[0061] in

[0062] R 1 It is independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms.

[0063] The first silane monomer according to formula (I) is a tetraalkoxysilane. Therefore, R 1 The alkyl groups of the residues can be the same or different.

[0064] The first silane monomer is preferably selected from tetramethoxysilane and tetraethoxysilane and mixtures thereof. Tetraethoxysilane is particularly preferred.

[0065] The second silane monomer is selected from compounds of formula (II).

[0066] Ar-Si(R 2 ) a (OR 3 ) 3-a (II)

[0067] in

[0068] Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl and phenanthrene, more preferably unsubstituted phenyl;

[0069] R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably straight-chain or branched alkyl groups with 1 or 2 carbon atoms;

[0070] R 3 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0071] a can be 0 or 1, preferably 1.

[0072] The optional substituents of the aromatic group Ar are preferably selected from C1 to C2. 20 Organic (organyl) group or organic hetero (organoheteryl) group.

[0073] Existing in R 2 The heteroatoms (one or more) in the organic heterogroup are preferably selected from N, O, P or S, more preferably from N and O.

[0074] An organic group is an organic substituent group that has a free valence on a carbon atom.

[0075] An organic heterogroup is an organic substituent group that has a free valence on an atom other than a carbon atom.

[0076] The second silane monomer is selected from phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, phenylethyldimethoxysilane, phenylethyldiethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane and mixtures thereof, preferably phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, phenylethyldimethoxysilane, phenylethyldiethoxysilane and mixtures thereof.

[0077] Particularly preferred are phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, and mixtures thereof. Most preferred is phenylmethyldimethoxysilane.

[0078] In step a), one or more compounds selected from formula (I), such as one to five, preferably one to three, more preferably one or two, and even more preferably one silane monomer, and one or more compounds selected from formula (II), such as one to five, preferably one to three, more preferably one or two, and even more preferably one silane monomer, are used to form a mixture.

[0079] In addition, a silane monomer different from the first silane monomer and the second silane monomer can be added to the mixture.

[0080] In one embodiment, at least two different silane monomers are composed of a silane monomer according to formula (I) and a silane monomer according to formula (II).

[0081] In the described embodiment, the first silane monomer is preferably selected from tetramethoxysilane and tetraethoxysilane and mixtures thereof, more preferably tetraethoxysilane, and

[0082] The second silane monomer is preferably selected from phenylmethyldimethoxysilane, phenylmethyldiethoxysilane and mixtures thereof, and more preferably phenylmethyldimethoxysilane.

[0083] In another embodiment, in step a), one or more other silane monomers, such as one to five, preferably one to three, more preferably one or two, and even more preferably one silane monomer, different from the first silane monomer of formula (I) and the second silane monomer of formula (II), are mixed together with the first silane monomer of formula (I) and the second silane monomer of formula (II) into the first solvent.

[0084] One or more silane monomers different from the first silane monomer of formula (I) and the second silane monomer of formula (II) are preferably selected from (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS), methyltriethoxysilane (MTEOS), n-octyltrimethoxysilane (n-octylTMS), n-propyltriethoxysilane (n-propylTEOS), n-hexyltriethoxysilane (n-hexylTEOS), dodecyltriethoxysilane (dodecylTEOS), 3-[bis(2-hydroxyethyl)amino]propyltriethoxysilane (BHEAPTEOS), methyltrimethoxysilane (MTMS), dimethyldiethoxysilane (DMDEOS), and 3-trimethoxysilylpropyl methacrylate. methacrylate, also known as 3-methacryloyloxypropyltrimethoxysilane (MEMO), bis(triethoxysilyl)ethane (BTESE), bis(methyldiethoxysilyl)ethane (BMDESE), 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (F13), 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (F17), 11-chloroundecyltriethoxysilane (Cl(CH2)). 11 TEOS; 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane (ECHETEOS), hydroxymethyltriethoxysilane (HMTEOS), N-(3-triethoxysilylpropyl)glucamide (NGPTEOS), (phenanthrene-9-yl)triethoxysilane ((phenanthrene-9-yl)TEOS), n-octyltrimethoxysilane (n-octylTMS), n-hexyltrimethoxysilane (n-hexylTMS), octaethoxy-1,3,5-trisilylene (OEOSTSP), aminopropyltriethoxysilane (APTEOS), aminopropyltrimethoxysilane ( APTMS), diphenyldimethoxysilane (DPDMS), diphenyldiethoxysilane (DPDEOS), dimethyldimethoxysilane (DMDMS), dimethyldiethoxysilane (DMDEOS), (3-glycidyl etheroxypropyl)methyldimethoxysilane (MGPDMS), (3-glycidyl etheroxypropyl)methyldiethoxysilane (MGPDEOS), 1,4-bis(triethoxysilyl)benzene (BTESB), 1,4-bis(trimethoxysilyl)benzene (BTMSB), hexadecyltrimethoxysilane (HDCTMS), and mixtures thereof.

[0085] Preferably, one or more silane monomers, different from the first silane monomer of formula (I) and the second silane monomer of formula (II), comprise (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS), and mixtures thereof.

[0086] Particularly preferred are one or more silane monomers that are different from the first silane monomer of formula (I) and the second silane monomer of formula (II) and are selected from (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS) and mixtures thereof, with (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS) being the most preferred.

[0087] In the described embodiment, the first silane monomer is preferably selected from tetramethoxysilane and tetraethoxysilane and mixtures thereof, more preferably tetraethoxysilane.

[0088] The second silane monomer is preferably selected from phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, and mixtures thereof, more preferably phenylmethyldimethoxysilane, and

[0089] One or more silane monomers, different from the first silane monomer of formula (I) and the second silane monomer of formula (II), are selected from (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS) and mixtures thereof, with (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS) being the most preferred.

[0090] In a particular embodiment, it is preferred that in step a), tetraethoxysilane, phenylmethyldimethoxysilane and optionally (3-glycidyl etheroxypropyl)trimethoxysilane are mixed into a first solvent to form a mixture.

[0091] In one embodiment, the total number of silane monomers comprises fluorinated silane monomers. In the same embodiment, the polysiloxane comprises fluorinated units.

[0092] In a second preferred embodiment, the total amount of silane monomers does not contain fluorinated silane monomers. In this embodiment, the polysiloxane does not contain fluorinated units.

[0093] The molar ratio of the first silane monomer to the second silane monomer is preferably in the range of 5.0:1.0 to 1.0:2.5, more preferably in the range of 4.0:1.0 to 1.0:1.0, even more preferably in the range of 3.5:1.0 to 1.5:1.0, and most preferably in the range of 3.0:1.0 to 2.0:1.0.

[0094] The molar ratio of one or more silane monomers (if present) different from the first silane monomer of formula (I) and the second silane monomer of formula (II) to the combined molar amount of the first silane monomer and the second silane monomer is preferably in the range of 1.0:5.0 to 1.0:30.0, more preferably in the range of 1.0:7.5 to 1.0:25.0, and most preferably in the range of 1.0:8.5 to 1.0 to 20.0.

[0095] The first solvent is preferably selected from the group consisting of ethanol (EtOH), acetone, 2-propanol (IPA), 1-propanol, propylene glycol methyl ether acetate (PGMEA), 1-methoxy-2-propanol (PGME), tetrahydrofuran (THF), and mixtures thereof.

[0096] At least two different silane monomers can be mixed in a first solvent at any suitable temperature for dissolving the silane monomers. Room temperature is typically sufficient.

[0097] In the next process step, the mixture undergoes at least partial hydrolysis in the presence of a catalyst.

[0098] Suitable catalysts are acidic catalysts, basic catalysts, or other catalysts.

[0099] The acidic catalyst is preferably selected from nitric acid (HNO3), sulfuric acid (H2SO4), formic acid (HCOOH), hydrochloric acid (HCl), sulfonic acid, hydrogen fluoride (HF), acetic acid (CH3COOH), trifluoromethanesulfonic acid, or p-toluenesulfonic acid. Particularly preferred acidic catalysts are nitric acid (HNO3), hydrochloric acid (HCl), and formic acid (HCOOH).

[0100] The alkaline catalyst is preferably selected from potassium hydroxide (KOH), sodium hydroxide (NaOH), triethylamine (TEA), ammonium hydroxide (NH4OH), tetraethylammonium hydroxide (TEAH), tetramethylammonium hydroxide (TMEA), 1,4-diazabicyclo[2.2.2]octane, imidazole and diethylenetriamine.

[0101] Other catalysts are preferably selected from 2,2,3,3,4,4,5,5-octafluoropentyl acrylate, poly(ethylene glycol) 200, poly(ethylene glycol) 300 and n-butylated melamine-formaldehyde resin.

[0102] The hydrolysis step is preferably carried out at a temperature of 20 to 80°C for 1 to 24 hours, such as overnight at room temperature.

[0103] During the hydrolysis step, the silane monomers are at least partially hydrolyzed. The at least partially hydrolyzed silane monomers are then at least partially polymerized, preferably by condensation polymerization and crosslinking, to form siloxane polymers.

[0104] The polysiloxane typically has a relatively low molecular weight of about 500 to 5000 g / mol.

[0105] According to a preferred embodiment, the mixture is subjected to at least partial hydrolysis, including reflux. A typical reflux time is 2 hours.

[0106] Following the hydrolysis step, the first solvent can be replaced with a second solvent in an optional further process step. This optional solvent replacement is advantageous because it helps remove water and alcohol formed during the hydrolysis of the silane monomer. Furthermore, it improves the properties of the final siloxane polymer solution when used as a thin film on a substrate, for example, as a coating.

[0107] The second solvent is preferably selected from 1-methoxy-2-propanol (PGME), methyl ethyl ketone (MEK), 2-propanol (IPA), dipropylene glycol n-butyl ether (DPnB), diethylene glycol mono-n-hexyl ether (DEnH), diethylene glycol monobutyl ether (DEG monobutyl ether or DEGBE or DEnB), diethylene glycol monoethyl ether (DEGEE), dipropylene glycol (DiPG), toluene, propylene glycol methyl ether acetate (PGMEA), ethylene glycol (EG), 1-butanol, 2-butanol, tert-butanol, iso-butanol, propylene glycol butyl ether (PnB), a mixture of two inseparable regioisomers of methoxy-nonafluorobutane (or methyl nonafluorobutane, Novec 7100), and ethoxy-nonafluorobutane (or ethyl nonafluorobutyl ether, Novec 7100). The group consisting of a mixture of two inseparable regioisomers of Novec 7200, 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane (Novec 7300) and mixtures thereof.

[0108] Novec 7100, Novec 7200 and Novec 7300 are available from 3M.

[0109] In one embodiment, the second solvent does not contain fluorinated solvents.

[0110] In the embodiments described, the composition comprising polysiloxane and solvent preferably does not contain fluorinated units.

[0111] Preferably, in the embodiment described, the film is a fluorine-free invisible fingerprint coating.

[0112] In the second embodiment, the second solvent comprises a fluorinated solvent. For example, additives may be introduced.

[0113] The mixture containing the siloxane polymer can undergo a further crosslinking step after the hydrolysis step. Therefore, the siloxane polymer is preferably at least partially crosslinked by thermal or radiation initiation.

[0114] In the context of this invention, the term "partially crosslinked" refers to a polymer that can be further crosslinked under conditions favorable to crosslinking. In fact, after the first polymerization step, the polymer still contains at least some reactive crosslinking groups. Further crosslinking (which typically occurs after the partially crosslinked composition is deposited onto a substrate) will be described below.

[0115] The siloxane polymers are preferably at least partially crosslinked by thermal or radiation initiation using a catalyst as described above.

[0116] Therefore, thermal crosslinking is preferably carried out at a temperature in the range of about 30 to 200°C.

[0117] Crosslinking is typically carried out under reflux conditions of the solvent.

[0118] Siloxane polymers can optionally be partially crosslinked during polymerization, particularly during or immediately after condensation polymerization. Various methods can be used to achieve crosslinking. For example, a crosslinking method can be employed where two chains are linked via reactive groups. One example is crosslinking via double bonds or epoxy groups.

[0119] As a result of partial crosslinking, the molecular weight will typically be 2 to 10 times greater. Therefore, crosslinking will increase the molecular weight from about 500 to 5000 g / mol to over 3000, preferably to 4000 to 20000 g / mol.

[0120] The molecular weight of the polymer can also be increased by performing an additional polycondensation step. The remaining unhydrolyzed free alkoxy groups can then react with each other. This step is typically carried out using a base catalyst, preferably a nitrogen-containing base (such as imidazole or tri(alkyl)amine).

[0121] Optionally, the resulting free Si-OH groups present in the backbone of the siloxane polymer can be protected by end-capping. For end-capping, the free Si-OH groups react with silanes (such as methyldichlorofluorosilane (Cl2FSiCH3), methylfluorodimethoxysilane ((MeO)2SiFCH3), 3-chloropropyltrimethoxysilane (Cl(CH2)3Si(OMe)3), trimethyltriethoxysilane (EtOTMS), trimethylchlorosilane (ClSiMe3), or trimethylmethoxysilane (MeOTMS)) in the presence of a catalyst (such as triethylamine (TEA) or imidazole). The amount of catalyst varies from 1.5 to 2% by weight of total solids. The reaction time varies from 5 to 45 min at RT or at elevated temperatures in the range of 40 to 125 °C, preferably in the range of 80 to 110 °C (e.g., 105 °C).

[0122] Other additives typically introduced into compositions containing siloxane polymers include chemicals that can further modify the final surface properties of the coated and cured film, improve the wettability / adhesion of the coating to the substrate, or improve the drying and stacking behavior of the coating during deposition and drying to achieve good visual quality.

[0123] These additives can be surfactants, defoamers, antifoaming agents, wetting agents, etc. Examples of such additives include: BYK-301, BYK-306, BYK-307, BYK-308, BYK-333, BYK-051, BYK-036, BYK-028, BYK-057A, BYK-011, BYK-055, BYK-036, BYK-067A, BYK-088, BYK-302, B BYK-310, BYK-322, BYK-323, BYK-331, BYK-333, BYK-341, BYK-345, BYK-348, BYK-370, BYK-377, BYK-378, BYK-381, BYK-390, BYK-3700, and BYK-3701 can all be purchased from BYK stores.

[0124] The additive is preferably present in an amount of 0.01 to 5% by weight of the total solid weight, more preferably 0.1 to 1% by weight.

[0125] The additive can be added at any step of the method according to the invention. For example, the additive can be introduced during mixing step a), optional solvent exchange step c), or in an additional step prior to forming a thin layer on the substrate in step d).

[0126] Preferably, the additive is added in the optional solvent exchange step c).

[0127] Prior to further condensation, excess water is preferably removed from the material, and at this stage, solvent exchange can be performed for another synthetic solvent, if desired. This other synthetic solvent can serve as the final processing solvent or one of the final processing solvents for the siloxane polymer. Residual water and alcohols, as well as other byproducts, can be removed after the further condensation steps. Additional processing solvents (one or more) can be added during the formulation step to form the final processing solvent combination. Additives, such as thermal initiators, radiation-sensitive initiators, sensitizers, surfactants, and other additives, can be added prior to the final filtration of the siloxane polymer. After the composition is formulated, the polymer is ready for processing, for example, in roll-to-roll film deposition or photolithography processes.

[0128] After synthesis, the siloxane polymer composition can be diluted with a suitable solvent or combination of solvents to obtain a solid content that will produce a pre-selected film thickness in film deposition.

[0129] The compositions described above may contain solid nanoparticles or other compounds in an amount between 1 and 50% by weight of the composition. The nanoparticles (or similar nanoscale or microscale rods, crystals, spheres, dots, buds, etc.) are particularly selected from the group consisting of light scattering, light absorption, light emission and / or conductive pigments, dyes, organic and inorganic phosphors, oxides, quantum dots, polymers or metals.

[0130] In step d), the composition obtained in step c) (if present) or step b) forms a thin layer on the substrate.

[0131] Suitable substrates include ceramics, glass, metals, natural and artificial stone, polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate), coatings (such as acrylic coatings), powder coatings (such as polyurethane or mixed powder coatings), and wood and fiber substrates (such as textiles, leather, carpets, and paper). Preferably, the substrate is selected from ceramics, glass, metals, polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate), natural and artificial stone, and more preferably from metals, ceramics, glass, and polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate).

[0132] The coating according to the invention is particularly suitable for dark substrates made of the materials described above, preferably for metal or anodized aluminum substrates, but not limited to these.

[0133] Step d) is preferably performed by dip coating, slot coating, a combination of slot coating and spin coating, spin coating, spraying, inkjet printing, curtain coating, roller coating, roll-to-roll coating, screen printing, or by using a rod, brush, or by friction; more preferably by spraying, slot coating, dip coating, spin coating; and most preferably by spraying and spin coating (mentions are made of some typical liquid phase deposition methods, but are not limited to these). Such methods are known in the art.

[0134] The temperature during step d) is preferably no more than 75°C, more preferably no more than 50°C, and most preferably no more than 35°C.

[0135] During step d), the temperature of the substrate preferably does not exceed 100°C, more preferably does not exceed 50°C, and most preferably does not exceed 35°C. In some cases, deposition may preferably be performed on a preheated substrate.

[0136] After forming a thin layer on the substrate in step d) and before curing the intermediate product in step f), patterns can be formed in the film to create surface structures and patterns. Suitable methods for pattern formation include nanoimprinting, embossing, roll-to-roll printing, gravure printing, flexographic printing, roll coating, inkjet printing, screen printing, spraying, and / or UV lithography, which are used as patterning processes to form surface structures (nanoscale, microscale, or millimeter scale).

[0137] The purpose of patterning is to give thin films additional optical, physical, or chemical properties.

[0138] If one or more solvents are present in step d), in step e), one or more solvents are preferably partially or completely removed. Step e) is optional and generally not required. There are differences between deposition methods and production line specifications.

[0139] In addition to temperature, a vacuum drying step may optionally be applied to promote the evaporation of one or more solvents. If a vacuum drying step is used, it is typically applied first, followed by thermal pre-curing. Typically, thermal curing is performed at a pressure of 50 to 200 kPa and / or followed by a temperature of 50 to 200°C, preferably at a pressure of 90 to 115 kPa and / or followed by a temperature of 60 to 150°C.

[0140] Optional thermal pre-curing is typically achieved by exposure to heat, for example, through the use of a convection oven, hot plate, or IR radiation.

[0141] Optional vacuum drying is performed using specific equipment that removes the solvent by applying a high vacuum in a specific chamber in which the coated substrate is loaded.

[0142] In step f), the intermediate product obtained in step e) (if present) is cured, or if step e) is absent, the intermediate product obtained in step d) is cured.

[0143] Curing is typically achieved by exposure to heat, such as through the use of a convection oven, hot plate, or IR radiation. Optionally, a curing process combining heat and UV can also be used.

[0144] The temperature used for curing is generally no more than 300°C, preferably no more than 250°C, and most preferably no more than 200°C or no more than 80°C.

[0145] The curing time is typically 10 min to 5.0 hours, preferably 20 min to 3.0 hours, and most preferably 5 min to 1.0 hours.

[0146] The film thickness after step f) is preferably 15 to 300 nm, more preferably 30 to 250 nm.

[0147] The thin film on the substrate is preferably used as a coating on at least one surface of the article, and more preferably as an invisible fingerprint coating on at least one surface of the article.

[0148] By carefully selecting fluorine-free silane monomers and / or solvents, a fluorine-free coating can be obtained on at least one surface of the article, and more preferably a fluorine-free invisible fingerprint coating can be obtained on at least one surface of the article.

[0149] The membrane preferably has an initial water contact angle of at least 60°, more preferably at least 63°, and most preferably at least 67°.

[0150] The upper limit of the initial water contact angle is usually no more than 100°, and preferably no more than 94°.

[0151] The membrane preferably has an initial oil contact angle of no more than 70°, more preferably no more than 67°, and most preferably no more than 65°.

[0152] The lower limit of the initial oil contact angle is typically at least 30°, preferably at least 35°.

[0153] After 200 steel wool abrasion cycles, the membrane preferably has a water contact angle of at least 55°, more preferably at least 60°, and most preferably at least 62°.

[0154] After 200 steel wool abrasion cycles, the upper limit of the water contact angle is generally no more than 100°, preferably no more than 95°.

[0155] After 500 steel wool abrasion cycles, the membrane preferably has a water contact angle of at least 55°, more preferably at least 57°, and most preferably at least 60°.

[0156] After 500 steel wool abrasion cycles, the upper limit of the water contact angle is generally no more than 95°, preferably no more than 90°.

[0157] The film further preferably exhibits good invisible fingerprint properties, easy cleaning properties, and chemical resistance.

[0158] The fingerprints on the film preferably do not reflect light and are therefore transparent. When applied to a dark surface, the fingerprints on the film preferably appear black.

[0159] Chemical resistance was measured by water contact angle and visual quality checks after different chemicals were applied to the film.

[0160] After the chemical substance is applied, the membrane preferably has a water contact angle of at least 45°, more preferably at least 47°, and most preferably at least 50°.

[0161] After the application of chemicals, the upper limit of the water contact angle is generally no more than 110°, and preferably no more than 105°.

[0162] Products

[0163] The present invention also relates to an article, preferably an article having a coated metal or anodized aluminum surface, the article comprising a thin film obtainable by the method according to the present invention.

[0164] The article can be a touch panel display, such as a handheld touch panel display or other interactive touch screen device, tablet computers and portable computers, as well as mobile phone casings and covers, console panels, home appliances, kitchen and other work surfaces, solar panel screens, windows, and articles with metal surfaces.

[0165] Suitable materials for articles comprising films obtainable by the method according to the invention include ceramics, glass, metals, natural and artificial stone, polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate), coatings (such as acrylic coatings), powder coatings (such as polyurethane or mixed powder coatings), wood and fiber substrates (such as textiles, leather, carpets, and paper). Preferably, the material for the article is selected from ceramics, glass (such as borosilicate glass, soda-lime glass, aluminosilicate glass, or any other type of glass), metals (such as aluminum, steel, etc.), polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate), natural and artificial stone, and more preferably from metals, ceramics, glass, and polymeric materials (such as poly(meth)acrylate, polycarbonate, polystyrene, styrene copolymers (such as styrene-acrylonitrile copolymers), polyesters, polyethylene terephthalate).

[0166] The coating according to the invention is particularly suitable for dark surfaces made of the materials described above, preferably for metal or anodized aluminum surfaces, but not limited thereto.

[0167] The thickness and shape of the article may vary depending on the specific circumstances, and it may be flat, 2D or 3D.

[0168] Before applying a thin film to an article (such as by deposition), the article may undergo chemical, physical, and / or mechanical surface treatments.

[0169] In the case of metals (such as aluminum), the article may be polished, anodized, colored, or coated with other (one or more) coatings before the material is deposited.

[0170] Glass can be non-tempered, thermally tempered, or chemically tempered, and it can have different surface treatments, including polishing, grinding, and cleaning using various surface treatment agents (alkaline or acidic).

[0171] In addition, the article can be flat, or it can have a surface texture (e.g., an etched glass surface or an anodized aluminum surface), or other layers on the article can provide a textured / wavy surface, or they can have no surface texture.

[0172] In the case of glass, the surface can be textured by using etching [e.g., to create an anti-glare (AG) effect on the glass] or by applying a coating to provide an AG effect.

[0173] The film can be applied directly to the article, so that at least one surface of the article is in direct contact with the film.

[0174] A thin film can also be applied to an intermediate layer such that the inner surface of the intermediate layer is in direct contact with at least one surface of the article. The film is then in direct contact with the outer surface of the intermediate layer. The intermediate layer can have mechanical, physical, chemical, or optical properties associated with material coatings. The intermediate layer can be an actual physical coating or can be a modification at the molecular and / or atomic level in the region of the article's surface in direct contact with the intermediate layer.

[0175] Preferred variations and embodiments of the method of the present invention are also preferred variations and embodiments of the articles of manufacture according to the present invention.

[0176] Preferably, fingerprints on the coating of the article do not reflect light and are therefore transparent. On articles with a black surface, fingerprints on the coating appear black.

[0177] Composition

[0178] The present invention also relates to a composition comprising a polysiloxane comprising at least two silane monomers according to formulas (I) and (II):

[0179] Si(OR 1 )4(I)

[0180] in

[0181] R 1 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0182] Ar-Si(R 2 ) a (OR 3 ) 3-a (II)

[0183] in

[0184] Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl and phenanthrene, more preferably unsubstituted phenyl;

[0185] R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably straight-chain or branched alkyl groups with 1 or 2 carbon atoms;

[0186] R 3Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and

[0187] a can be 0 or 1, preferably 1.

[0188] The preferred features of the method according to the invention are also the preferred features of the composition according to the invention.

[0189] Particularly preferred are the silane monomers of the polysiloxane, which are tetraethoxysilane, phenylmethyldimethoxysilane, and optionally (3-glycidyl etheroxypropyl)trimethoxysilane.

[0190] This composition is surprisingly stable at room temperature and at slightly elevated temperatures (up to 40°C).

[0191] The composition typically has a shelf life of at least 6 months, as determined in the experimental section.

[0192] use

[0193] The present invention also relates to the use of the compositions described above or below for preparing a coating on an article of manufacture, preferably for preparing an invisible fingerprint coating on an article of manufacture.

[0194] The preferred features of the methods, compositions, films, and substrates according to the present invention are also preferred features of the uses of the present invention.

[0195] Experimental Section

[0196] Measurement methods

[0197] molecular weight

[0198] The gel permeation chromatography system consisted of a GPC unit equipped with a Waters 1515 isocratic HPLC pump and a Waters 2414 refractive index detector. Polysiloxane (0.20 g, 50% solids content) was dissolved in THF (HPLC grade; 2.30 g). The analyte injection volume was 100 µL, and the flow rate was 0.70 mL / min. -1 The column temperature was set to 40°C. Four size-resistance-based polystyrene columns were used. The mobile phase was THF (HPLC grade). An internal standard was used, such as two series of polystyrene (Series A:M). w =120000 g mol -1 42400 g mol -1 10700 g mol -1 2640 g mol -1 474 g mol -1Five types of polystyrene, and series B:M w = 193000 g mol -1 16700 g mol -1 6540 g mol -1 890 g mol -1 Four polymers were used to determine the polymer's weight-average molecular weight (M). w ).

[0199] Solid content (Moisture analysis measurement)

[0200] The solid content of the polymer was determined using a Mettler Toledo HB43 instrument. The polymer solution to be analyzed (0.9 to 1.1 g) was placed in a measuring tray (disposable aluminum weighing / drying tray). The aluminum tray was then heated from room temperature to T = 160 °C for 10 min using a halogen lamp. After solvent evaporation, the mass of solid polymer present in the analyzed polymer solution was determined.

[0201] Water contact angle (WCA), oil contact angle (OCA)

[0202] Using a spraying tool (typical spraying process: scanning speed: 300 mm / s; spacing: 50 mm; gap: 100 mm; flow rate: 5 to 6 ml / min; atomizing air pressure: 5 kg / cm²), the spraying process was carried out. 2 Thin films are prepared on pretreated (plasma-treated) glass or anodized aluminum substrates, followed by thermosetting at, for example, 150°C for 60 min (for glass and ceramic) and 80°C for 60 min (for anodized aluminum). Static water contact angle (WCA) measurements are performed using an optical tensiometer with distilled water and a droplet size of 4 µl. The average of three measurement points is recorded as the result, and the Young-Laplace equation is used as the numerical method to describe the droplet profile (tool: Attension Theta optical tensiometer). In addition to water, other liquids (such as diiodomethane and hexadecane) can be used to characterize the surface to measure the oil contact angle (OCA).

[0203] Wear

[0204] Using a spraying tool (typical spraying process: scanning speed: 300 mm / s; spacing: 50 mm; gap: 100 mm; flow rate: 5 to 6 ml / min; atomizing air pressure: 5 kg / cm²), the spraying process was carried out. 2Thin films were prepared on pretreated (plasma-treated) glass, anodized aluminum, or ceramic substrates, followed by thermal curing at, for example, 150°C for 60 min (for glass and ceramics) and 80°C for 60 min (for anodized aluminum and other metals). Abrasion tests were performed using Bon Star steel wool #0000, a 1 kg load, a 1 × 1 cm indenter (for non-metallic substrates) or a 2 × 2 cm indenter (for metallic substrates), a 2-inch stroke, and a speed of 60 c / min. (Tool: Taber linear abrasion tester, 5750). Abrasion test evaluation criteria: initial water contact angle, water contact angle measurement at 50 cycle intervals (maximum 300 cycles), and visual inspection / visual scratch inspection of surface damage at 50 cycle intervals (maximum 300 cycles). The water contact angle was measured according to the water contact angle measurement method, and the visual inspection was performed under a microscope and green and red quality lights. In addition to steel wool, cotton cloth, wool felt, and Minoan erasers were also used to test abrasion performance.

[0205] The invisibility of fingerprints and fingerprint color

[0206] To determine the invisibility of fingerprints, the following scheme is followed:

[0207] (a) Collect an appropriate amount of oil from the face (especially the forehead and nose area) by rubbing the fingertips of both hands together.

[0208] (b) Rub your hands together to spread the oil evenly on your fingertips.

[0209] (c) By applying moderate pressure, three fingerprints (using the tips of the index, middle, and ring fingers) are imprinted onto the substrate at once. Both hands can be used simultaneously to imprint onto two substrates.

[0210] (d) Repeat steps (a) through (d) to imprint fingerprints on all considered substrates. It is recommended that a maximum of 10 substrates be considered as a group for testing. Otherwise, there is a possibility that insufficient oil may prevent collection on the face.

[0211] (e) Fingerprint color inspection and visibility rating: Generally, D65 lighting or office lighting is recommended to check the color of the fingerprint [white or black (indicating transparency)], and three different viewing angles (0°, 45°, and 90°). Visibility ratings range from 0 to a maximum of 3, from invisible to easily visible from all angles.

[0212] (f) Clean fingerprints by unidirectional wiping with a microfiber cloth (or similar material). Calculate the number of wipes required to clean each fingerprint. The wiped area must be properly dried with a cloth / towel before the cleaning agent (e.g., lab-grade IPA) dries on the surface to avoid streaks.

[0213] (g) Repeat steps (a) through (e) at least 3 times and report the average value.

[0214] Fingerprint invisibility: Level: 0 to 3 (0 is the best; 3 is the worst). 0 = No fingerprint visible; 1 = Slight trace, difficult to see from any angle (0°, 45°, 90°); 2 = Some trace, not visible from every angle; 3 = Visible from all angles.

[0215] During the process of determining the invisibility of a fingerprint, check whether the fingerprint color is white or black.

[0216] Therefore, white or black is how fingerprints appear on a dark substrate (such as an anodized aluminum substrate). If the fingerprint oil can spread on the substrate, the fingerprint does not reflect light and appears as black as a color on the dark substrate. Fingerprint color: W = white; B = black.

[0217] Easy-to-clean (E2C) performance

[0218] Use a microfiber cloth to wipe away fingerprints. The pressure applied is unknown, but minimal force has been used (like a common dust wiping cleaning procedure).

[0219] The ratings are from A to C: the ability to clean fingerprints with a dry cloth. A = easy to wipe; B = requires several rubs with considerable force; C = cannot remove fingerprints, but spreads them.

[0220] Chemical resistance (Table 2)

[0221] Four chemicals (1 = soft soap, 2 = skin cream, 3 = peroxide-containing disinfectant, 4 = neutral hand sanitizer) were tested to determine the chemical resistance of the coating. Chemicals 1, 2, and 4 were applied to the coating using a cotton pad to completely cover the 20 × 20 mm defined test area. Excess chemicals were removed with a dry cotton pad. For chemical 3, the same procedure was performed, but a wet wipe was used instead of a cotton pad.

[0222] Test conditions: The sample should be placed at room temperature for at least 12 hours, and then placed in a climate chamber (55℃ / 85%RH) for 24 hours.

[0223] Washing procedure: Remove the sample from the climate chamber and wash it with a 5% fairy detergent solution. Wiping should be done in a circular motion.

[0224] Visual Quality (VQ) Inspection: This involves visually inspecting for cosmetic defects (paint peeling, staining, discoloration, etc.). The grading is as follows:

[0225]

[0226] Water contact angle (WCA) measurement: A KRÜSS contact angle measuring instrument was used with a water droplet size of 4 μm and a delay time of 15 s. Automatic baseline correction and the elliptic method were employed to calculate the WCA. The experiment was repeated four times for each area where the chemical was applied.

[0227] Synthesis Example :

[0228] Abbreviations of components :

[0229] TEOS Tetraethoxysilane

[0230] n-HexylTEOS n-Hexyltriethoxysilane

[0231] PMDMS (phenylmethyldimethoxysilane)

[0232] MEMO 3-Trimethoxysilylpropionate

[0233] TESE bis(triethoxysilyl)ethane

[0234] F13 1H,1H,2H,2H-perfluorooctyltrimethoxysilane

[0235] GPTMS (glycidyl etheroxypropyl)trimethoxysilane

[0236] MTEOS Methyltriethoxysilane

[0237] PTMS (Phenylacetyltrimethoxysilane)

[0238] EtOH (ethanol)

[0239] MeOH (methanol)

[0240] H2O water

[0241] DI-H2O deionized water

[0242] IPA 2-propanol

[0243] PGME Propylene Glycol Monomethyl Ether

[0244] PGMEA propylene glycol monomethyl ether acetate

[0245] Novec 7100 is a mixture of isomers of methoxy-nonafluorobutane, commercially available from 3M.

[0246] Novec 7200 is a mixture of isomers of ethoxy-nonafluorobutane, commercially available from 3M.

[0247] Novec 7300 1,1,1,2,2,3,4,5,5,5-Decafluoro-3-methoxy-4-(trifluoromethyl)pentane, commercially available from 3M.

[0248] MEK methyl ethyl ketone

[0249] EG ethylene glycol

[0250] PnB Propylene Glycol Butyl Ether

[0251] MTBE (methyl tert-butyl ether)

[0252] KOH (potassium hydroxide, 0.1 M; aqueous solution)

[0253] HCOOH formic acid (0.1 M or 0.01 M; aqueous solution)

[0254] HNO3 (nitric acid, 0.1 M; aqueous solution)

[0255] DSX-E OPTOOL DSX E (fluoropolyether silane) is available from Daikin.

[0256] ZrO2 zirconium dioxide particles

[0257] PDS-1615 silanol-terminated (14 to 18% diphenylsiloxane)-dimethylsiloxane copolymer is commercially available from Gelest Inc.

[0258] AQSF-2P500C2-081 / 0720 Aquashield forte (ceramic nanoparticles dispersed in an organic medium (e.g., isopropanol)) is commercially available from TECNAN.

[0259] RT room temperature

[0260] Example 1 - Comparative Example:

[0261] In a three-necked round-bottom flask, n-hexyl TEOS (50 g; 0.20 mol) was mixed with EtOH (50 g). KOH (0.1 M; 40 g) was added dropwise. The reaction mixture was stirred overnight at RT. The solvent was then evaporated to give a white viscous liquid. The polymer (0.75 g) was mixed with PGME (66.35 g), Novec 7100 (70.77 g), and EG (3.52 g). The polymer did not dissolve in the reaction mixture, and the formulation could not be coated onto any substrate.

[0262] Example 2:

[0263] In a 250 mL round-bottom flask, PMDMS (12.76 g; 0.075 mol), TEOS (4.16 g; 0.03 mol), and n-hexylTEOS (2.48 g; 0.01 mol) were mixed in EtOH (19 g). HCOOH (0.1 M; aqueous solution; 9 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (30 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 25.86%, and it was then adjusted to 10% by adding more PGME (59.65 g). The polymer (10.5 g; 10% solids content in PGME) was mixed with Novec 7100 (69.35 g), PGME (56.45 g), and EG (3.47 g).

[0264] Example 3:

[0265] In a 250 mL round-bottom flask, PMDMS (12.76 g; 0.075 mol) and TEOS (6.25 g; 0.03 mol) were mixed in EtOH (19 g). HCOOH (0.1 M; aqueous solution; 4.68 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (30 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 17.16%, and it was then adjusted to 10% by adding more PGME (22.19 g). The polymer (10.5 g; 10% solids content in PGME) was mixed with Novec 7100 (69.35 g), PGME (56.45 g), and EG (3.47 g).

[0266] Example 4 - Comparative Example:

[0267] In a 500 mL round-bottom flask, BTESE (70 g; 0.2 mol) was mixed with acetone (180 g). HNO3 (0.1 M; 21.6 g) was added dropwise, and the reaction mixture was refluxed for 1 h. After cooling to RT, PGME (180 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 25.55%, and then adjusted to 10% by adding more PGME (217.7 g). The polymer (10.47 g; 10% solids content in PGME) was mixed with Novec 7100 (69.5 g), PGME (56.49 g), and EG (3.47 g).

[0268] Example 5 - Comparative Example:

[0269] In a 500 mL round-bottom flask, BTESE (70 g; 0.2 mol) was mixed with acetone (180 g). HNO3 (0.1 M; 21.6 g) was added dropwise, and the reaction mixture was refluxed for 1 h. After cooling to RT, PGME (180 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 25.55%, and then adjusted to 10% by adding more PGME (217.7 g). The polymer (10.47 g; 10% solids content in PGME) was mixed with MEK (38.61 g), PGME (87.61 g), and EG (3.58 g).

[0270] Example 6 - Comparative Example:

[0271] In a 1 L round-bottom flask, BTESE (120 g; 33.83 mmol), GPTMS (0.9 g; 0.38 mmol), and F13 (6 g; 1.17 mmol) were mixed with IPA (126.9 g) and acetone (380.7 g). HNO3 (0.1 M; 73.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (200 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 36.35%, and then adjusted to 10% by adding more PGME (463.2 g). The polymer (10.57 g; 10% solids content in PGME) was mixed with Novec 7100 (69.39 g), PGME (56.33 g), and EG (3.5 g).

[0272] Example 7 - Comparative Example:

[0273] In a 1 L round-bottom flask, BTESE (120 g; 33.83 mmol), GPTMS (0.9 g; 0.38 mmol), and F13 (6 g; 1.17 mmol) were mixed with IPA (126.9 g) and acetone (380.7 g). HNO3 (0.1 M; 73.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (200 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 36.35%, and it was then adjusted to 10% by adding more PGME (463.2 g). The polymer (10.51 g; 10% solids content in PGME) was mixed with MEK (38.53 g), PGME (87.67 g), and EG (3.55 g).

[0274] Example 8:

[0275] In a 500 mL round-bottom flask, PMDMS (36.44 g; 199 mmol) and TEOS (41.6 g; 199 mmol) were mixed in EtOH (78.04 g). HCOOH (0.1 M; 43.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (120 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.13%, and it was then adjusted to 10% by adding more PGME (239.8 g). The polymer (10.56 g; 10% solids content in PGME) was mixed with Novec 7100 (69.72 g), PGME (56.39 g), and EG (3.48 g).

[0276] Example 9 - Comparative Example:

[0277] In a 500 mL round-bottom flask, PMDMS (70 g; 0.384 mol) was mixed with acetone (180 g). HNO3 (0.1 M; 13.82 g) was added dropwise, and the reaction mixture was refluxed for 1 h. After cooling to RT, PGME (180 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 24.03%, and then adjusted to 10% by adding more PGME (204 g). The polymer (10.48 g; 10% solids content in PGME) was mixed with Novec 7100 (69.63 g), PGME (56.44 g), and EG (3.51 g).

[0278] Example 10 - Comparative Example:

[0279] In a 500 mL round-bottom flask, TEOS (43.44 g; mol) and ZrO2 (8.24 g; 50 wt% in PGMEA) were mixed in acetone (137.00 g). HNO3 (0.1 M; 29.98 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (116 g) was added, and a solvent exchange from EtOH / acetone / H2O to PGME was performed. The solids content was found to be 21.43%, and then adjusted to 10% by adding more PGME (118 g). The polymer (10.52 g; 10% solids content in PGME) was mixed with Novec 7100 (70.01 g), PGME (56.39 g), and EG (3.51 g).

[0280] Example 11 - Comparative Example:

[0281] In a 10 L reactor, tetraethoxysilane (510.72 g) was mixed with acetone (1600 g). HNO3 (0.1 M; 353.28 g) was added dropwise, and the reaction mixture was refluxed for 1 h. After cooling to room temperature, 1-methoxy-2-propanol (1600 g) was added, and solvent exchange from EtOH / acetone / H2O to PGME was carried out under reduced pressure. After moisture analysis, the solid content was adjusted to 10% by adding 1-methoxy-2-propanol. The polymer (75 g; 10% solid content in PGME) was mixed with Novec 7100 (495.5 g), PGME (402.7 g), DSX-E (2.5 g), and EG (24.8 g).

[0282] Example 12 - Comparative Example:

[0283] In a 10 L reactor, tetraethoxysilane (510.72 g) was mixed with acetone (1600 g). HNO3 (0.1 M; 353.28 g) was added dropwise, and the reaction mixture was refluxed for 1 h. After cooling to room temperature, 1-methoxy-2-propanol (1600 g) was added, and solvent exchange from EtOH / acetone / H2O to PGME was carried out under reduced pressure. After moisture analysis, the solid content was adjusted to 10% by adding 1-methoxy-2-propanol. The polymer (10.53 g; 10% solid content in PGME) was mixed with Novec 7100 (69.04 g), PGME (56.43 g), and EG (3.49 g).

[0284] Example 13:

[0285] In a 500 mL round-bottom flask, PMDMS (27.30 g; 150 mmol) and TEOS (72.91 g; 350 mmol) were mixed in EtOH (100 g). HCOOH (0.1 M; 61.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from MeOH / EtOH / H2O to PGME was performed. The solid content was found to be 21.98%, and it was then adjusted to 10% by adding more PGME (227.26 g). The polymer (10.53 g; 10% in PGME) was mixed with Novec 7100 (69.78 g), PGME (56.47 g), EG (3.49 g), and PDS-1615 (0.7 g).

[0286] Example 14:

[0287] In a 500 mL round-bottom flask, PMDMS (18.23 g; 100 mmol), TEOS (72.91 g; 350 mmol), and MEMO (12.41 g; 50 mmol) were mixed in EtOH (103 g). HCOOH (0.1 M; 63 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from MeOH / EtOH / H2O to PGME was performed. The solids content was found to be 26.71%, and it was then adjusted to 10% by adding more PGME (254.00 g). The polymer (10.5 g; 10% of PGME) was mixed with Novec 7100 (69.71 g), PGME (56.58 g), and EG (3.5 g).

[0288] Example 15:

[0289] In a 500 mL round-bottom flask, PMDMS (27.30 g; 150 mmol) and TEOS (72.91 g; 350 mmol) were mixed in EtOH (100 g). HCOOH (0.1 M; 61.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from MeOH / EtOH / H2O to PGME was performed. The solid content was found to be 21.98%, and it was then adjusted to 10% by adding more PGME (227.26 g). The polymer (10.54 g; 10% in PGME) was mixed with Novec 7100 (69.42 g), PGME (56.40 g), EG (3.54 g), and AQSF-2P500C2-081 / 0720 (0.35 g).

[0290] Example 16:

[0291] In a 10 L reactor, PMDMS (300.3 g; 1.64 mol) and TEOS (802.01 g; 3.85 mol) were mixed in EtOH (1,100 g). HCOOH (0.1 M; 673.2 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (17,050 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 30.46%, and it was then adjusted to 10% by adding more PGME (3,365 g). The polymer (10.48 g; 10% of PGME) was mixed with Novec 7100 (28.03 g), PGME (98.18 g), and EG (3.51 g).

[0292] Example 17:

[0293] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol) and TEOS (72.91 g; 350 mmol) were mixed in EtOH (100 g). HCOOH (0.1 M; 61.2 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 21.98%, and it was then adjusted to 10% by adding more PGME (227.26 g). The polymer (21 g; 10% of PGME) was mixed with Novec 7100 (139.45 g), PGME (112.76 g), and EG (6.95 g).

[0294] Example 18:

[0295] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (75.13 g; 10% of PGME) was mixed with Novec 7100 (498.1 g), PGME (402.72 g), and EG (24.75 g).

[0296] Example 19:

[0297] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (37.74 g; 10% of PGME) was mixed with Novec 7100 (100.12 g), PGME (350.08 g), and EG (12.42 g).

[0298] Example 20:

[0299] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (37.55 g; 10% in PGME) was mixed with Novec 7100 (50.08 g), PGME (400.13 g), and EG (12.4 g).

[0300] Example 21:

[0301] In a 1 L round-bottom flask, PMDMS (34.2 g; 187 mmol), TEOS (109.36 g; 525 mmol), and GPTMS (8.86 g; 37.5 mmol) were mixed in EtOH (152.15 g). HCOOH (0.1 M; 93.15 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (225 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 24.83%, and it was then adjusted to 10% by adding more PGME (385.58 g). The polymer (37.51 g; 10% in PGME) was mixed with Novec 7200 (100.02 g), PGME (350.02 g), and EG (16.81 g).

[0302] Example 22:

[0303] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (37.6 g; 10% of PGME) was mixed with PGME (450.11 g) and EG (13.1 g).

[0304] Example 23:

[0305] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (10.5 g; 10% of PGME) was mixed with MEK (69.73 g), PGME (56.4 g), and EG (3.53 g).

[0306] Example 24:

[0307] In a 500 mL round-bottom flask, PMDMS (27.3 g; 150 mmol), TEOS (62.5 g; 300 mmol), and GPTMS (11.81 g; 50 mmol) were mixed in EtOH (101.61 g). HCOOH (0.1 M; 59.4 g) was added, and the reaction mixture was refluxed for 2 h. After cooling to RT, PGME (150 g) was added, and a solvent exchange from EtOH / MeOH / H2O to PGME was performed. The solids content was found to be 27.10%, and it was then adjusted to 10% by adding more PGME (308 g). The polymer (10.5 g; 10% of PGME) was mixed with IPA (69.73 g), PGME (56.5 g), and EG (3.5 g).

[0308] Example 25 - Comparative Example

[0309] In a 500 mL round-bottom flask, GPTMS (7.09 g; 29.9 mmol), MTEOS (44.10 g; 247.3 mmol), and PTMS (4.46 g; 22.4 mmol) were mixed with IPA (55 g). HNO3 (0.1 M; 32.35 g) was added dropwise, and the reaction mixture was refluxed for 2 h. After cooling to RT, PnB (50 g) was added, and a solvent exchange from EtOH / MeOH / IPA / H2O to PGME was performed. The solids content was found to be 36.67%, and it was then adjusted to 10% by adding more PnB (189 g). Triethylamine (0.08 g) was then added, and the reaction mixture was stirred at T = 95 °C for 40 min. After cooling to RT, the reaction mixture was transferred to a separatory funnel. MTBE (100 g) and DI-H2O (100 g) were added. After phase separation, the organic phase was washed with DI-H2O (4 × 50 g). PnB (50 g) was added to the organic phase, and a fresh solvent exchange was performed from MTBE / H2O / PnB to PnB. The solid content was found to be 6.86%. ClSi(CH3)3 (1% solids: 0.08 g) was added, and the reaction mixture was stirred at T = 105 °C for 90 min. The polymer (6.86% in PnB; 33.58 g) was mixed with Novec 7200 (60 g), PGME (198.97 g), and EG (7.44 g).

[0310] Process conditions and application examples:

[0311] Typical substrate cleaning procedure before spraying (taking glass as an example):

[0312] Before coating, the glass substrate must be free of stains, debris, and any grease; it is important to achieve good wettability of the glass surface (the water contact angle of the glass surface should be < 5° before coating to ensure excellent coating performance and visual quality).

[0313] Step 1: Liquid alkaline or acidic glass cleaning solution; use a non-foaming cleaner in glass cleaning machinery:

[0314] Step 2: Perform the DI water cleaning step in the glass cleaning machine;

[0315] Step 3: Plasma / corona treatment (if possible, perform a water contact angle check of < 5° as a quality inspection) (in the case of glass, liquid cleaning and / or plasma cleaning steps can be used).

[0316] Optimize spraying parameters to achieve a target cured film thickness of 40 to 100 nm; handle the substrate carefully to avoid damaging the wet coating during transfer to heat curing; Step 5: Curing temperature 80 to 250°C; curing time 30 to 60 minutes; no special atmosphere required.

[0317] Spraying settings and parameters:

[0318] Step 4: Spraying process; optimize spraying parameters to achieve a target cured film thickness of 40 to 100 nm;

[0319] Curing conditions:

[0320] Handle the substrate carefully to avoid damaging the wet coating during transfer to the thermosetting process;

[0321] Step 5: Curing temperature is 70 to 200℃; curing time is 15 to 60 minutes; no special atmosphere required.

[0322] Application example:

[0323] As described above, films are prepared on brushed substrates, anodized aluminum substrates, and dark substrates.

[0324] The oil contact angle (OCA), water contact angle (WCA), fingerprint invisibility (IF), fingerprint color (FC), easy-to-clean properties (E2C), and abrasion resistance of the cured film are shown in Table 1.

[0325] Table 2 lists the chemical resistance of a selected number of examples.

[0326] Table 1

[0327]

[0328] Table 2

[0329]

Claims

1. A method for preparing a thin film on a substrate, the method comprising the following steps: a) Mixing at least two different silane monomers into a first solvent to form a mixture, under the following conditions: The first silane monomer is selected from the compound Si(OR) of formula (I). 1 )4(I)where R 1 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and The second silane monomer is selected from the compound Ar-Si(R) of formula (II). 2 ) a (OR 3 ) 3-a (II) Wherein Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl, and phenanthrene, more preferably unsubstituted phenyl; R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably 1 or 2 carbon atoms of a straight-chain or branched alkyl group; R 3 The solvent is independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and a is 0 or 1, preferably 1; b) the silane monomer is at least partially hydrolyzed in the presence of a catalyst, and the silane monomer according to formula (I) and (II) is polymerized to obtain a composition comprising a polysiloxane containing a silane monomer according to formula (I) and (II); c) the first solvent is optionally replaced with a second solvent; d) the composition obtained in step c), if present, or in step b), forms a thin layer on the substrate; e) after step d), the solvent is optionally partially or completely removed, if present; f) if step e), the intermediate product obtained in step e) is cured, or if step e) is absent, the intermediate product obtained in step d) is cured to obtain a thin film.

2. The method according to claim 1, wherein the first silane monomer is selected from tetramethoxysilane and tetraethoxysilane and mixtures thereof.

3. The method according to claim 1 or 2, wherein the second silane monomer is selected from phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, phenylethyldimethoxysilane, phenylethyldiethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane and mixtures thereof, preferably phenylmethyldimethoxysilane, phenylmethyldiethoxysilane, phenylethyldimethoxysilane and mixtures thereof, more preferably phenylmethyldimethoxysilane, phenylmethyldiethoxysilane and mixtures thereof.

4. The method according to any one of claims 1 to 3, wherein in step a), one or more other silane monomers different from the first silane monomer of formula (I) and the second silane monomer of formula (II) are mixed together with the first silane monomer of formula (I) and the second silane monomer of formula (II) into the first solvent.

5. The method according to claim 4, wherein the one or more silane monomers different from the first silane monomer of formula (I) and the second silane monomer of formula (II) are selected from (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS), methyltriethoxysilane (MTEOS), n-octyltrimethoxysilane (n-octylTMS), n-propyltriethoxysilane (n-propylTEOS), n-hexyltriethoxysilane (n-hexylTEOS), and dodecyltriethoxysilane (dodecylTEOS). 3-[bis(2-hydroxyethyl)amino]propyltriethoxysilane (BHEAPTEOS), methyltrimethoxysilane (MTMS), dimethyldiethoxysilane (DMDEOS), 3-trimethoxysilylpropionate methacrylate (MEMO), bis(triethoxysilyl)ethane (BTESE), bis(methyldiethoxysilyl)ethane (BMDESE), 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (F13), 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (F17), 11-chloroundecyltriethoxysilane (Cl(CH2)) 11 TEOS; 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane (ECHETEOS), hydroxymethyltriethoxysilane (HMTEOS), N-(3-triethoxysilylpropyl)glucamide (NGPTEOS), (phenanthrene-9-yl)triethoxysilane ((phenanthrene-9-yl)TEOS), n-octyltrimethoxysilane (n-octylTMS), n-hexyltrimethoxysilane (n-hexylTMS), octaethoxy-1,3,5-trisilylene (OEOSTSP), aminopropyltriethoxysilane (APTEOS), aminopropyltrimethoxysilane ( APTMS), diphenyldimethoxysilane (DPDMS), diphenyldiethoxysilane (DPDEOS), dimethyldimethoxysilane (DMDMS), dimethyldiethoxysilane (DMDEOS), (3-glycidyl etheroxypropyl)methyldimethoxysilane (MGPDMS), (3-glycidyl etheroxypropyl)methyldiethoxysilane (MGPDEOS), 1,4-bis(triethoxysilyl)benzene (BTESB), 1,4-bis(trimethoxysilyl)benzene (BTMSB), hexadecyltrimethoxysilane (HDCTMS), and mixtures thereof.

6. The method according to claim 4 or 5, wherein the one or more silane monomers different from the first silane monomer of formula (I) and the second silane monomer of formula (II) comprise (3-glycidyl etheroxypropyl)trimethoxysilane (GPTMS), (3-glycidyl etheroxypropyl)triethoxysilane (GPTEOS), and mixtures thereof.

7. The method according to any one of claims 1 to 6, wherein in step a), tetraethoxysilane, phenylmethyldimethoxysilane and optionally (3-glycidyl etheroxypropyl)trimethoxysilane are mixed into a first solvent to form a mixture.

8. The method according to any one of claims 1 to 7, wherein the first solvent is selected from ethanol (EtOH), acetone, 2-propanol (IPA), 1-propanol, propylene glycol methyl ether acetate (PGMEA), 1-methoxy-2-propanol (PGME), tetrahydrofuran (THF), and mixtures thereof, and / or the second solvent is selected from 1-methoxy-2-propanol (PGME), methyl ethyl ketone (MEK), 2-propanol (IPA), dipropylene glycol n-butyl ether (DPnB), diethylene glycol mono-hexyl ether (DEnH), diethylene glycol monobutyl ether (DEG monobutyl ether or DEGBE or DEnB), diethylene glycol monoethyl ether (DEGEE), dipropylene glycol (DiPG), toluene, propylene glycol methyl ether acetate (PGMEA), ethylene glycol (EG), 1-butanol, 2-butanol, tert-butanol, iso-butanol, propylene glycol butyl ether (PnB), methoxy-nonafluorobutane (Novec). Novec 7100), ethoxy-nonafluorobutane (Novec 7200), 1,1,1,2,2,3,4,5,5,5-decafluoro-3-methoxy-4-(trifluoromethyl)pentane (Novec 7300) and mixtures thereof.

9. The method according to any one of claims 1 to 8, wherein the membrane has a thickness of 15 to 250 nm, more preferably 30 to 200 nm.

10. An article, preferably having a coated metal or anodized aluminum surface, the article comprising a film obtainable by the method according to any one of claims 1 to 9 as at least one surface of the article, preferably a coating on a coated metal or anodized aluminum surface.

11. The article of claim 10, wherein the fingerprint on the coating is transparent.

12. The article of claim 10 or 11, wherein it is a touch panel display, such as a handheld touch panel display or other interactive touch screen device, tablet computer and portable computer and mobile phone casing and cover, console panel, household appliance, kitchen and other work surface, solar panel screen, window and article of having a metal surface.

13. A composition comprising a polysiloxane, said polysiloxane comprising at least two silane monomers according to formulas (I) and (II): Si(OR) 1 )4(I)where R 1 Independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and Ar-Si(R 2 ) a (OR 3 ) 3-a (II) Wherein Ar is a substituted or unsubstituted aromatic group, preferably selected from substituted or unsubstituted phenyl, naphthyl, anthraceneyl, and phenanthrene, more preferably unsubstituted phenyl; R 2 Independently selected from hydrogen and straight-chain or branched hydrocarbon groups, preferably having 1 to 10 carbon atoms, more preferably 1 to 6 carbon atoms, and even more preferably 1 or 2 carbon atoms of a straight-chain or branched alkyl group; R 3 It is independently selected from straight-chain or branched alkyl groups having 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, more preferably 1 or 2 carbon atoms; and a is 0 or 1, preferably 1.

14. The composition of claim 13, wherein the silane monomer of the polysiloxane is tetraethoxysilane, phenylmethyldimethoxysilane, and optionally (3-glycidyl etheroxypropyl)trimethoxysilane.

15. The use of the composition according to claim 13 or 14 for preparing a coating on an article of manufacture, preferably for preparing an invisible fingerprint coating on an article of manufacture.

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