Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
  • C08G77/46—Block-or graft-polymers containing polysiloxane sequences containing polyether sequences
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
  • C09D183/10—Block or graft copolymers containing polysiloxane sequences
  • C09D183/12—Block or graft copolymers containing polysiloxane sequences containing polyether sequences
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
  • G02B1/041—Lenses

Definitions

• TITLE New functionalized organopolysiloxane compounds, manufacturing method, and uses thereof
• the invention relates to novel functionalized organopolysiloxane compounds. More specifically, the invention relates to novel functionalized organopolysiloxane compounds having improved hydrophilic properties, which can be used as such or in the preparation of silicone gels, rubbers, coatings and emulsions, useful in different applications such as cosmetics, personal care, medical, house care, textile, electronics, coatings, construction, surfactants, antifoams, emulsifiers, etc. Besides, the novel functionalized organopolysiloxane compounds of the invention can be useful as an ophthalmic lens material.
• Functionalized organopolysiloxane compounds are of high interest in many technical fields because of their unique properties. Within the group of functionalized organopolysiloxanes, a focus is made on those containing at the same time non-polymerizable functions and polymerizable functions.
• Prior art document US 4,259,467 discloses polysiloxanes compounds containing hydrophilic sidechains and some a free radical polymerizably activated monovalent unsaturated group at terminal position.
• Prior art document US 2014/0350278 Al discloses a process of making a polymerizable hybrid polysiloxane. The process includes reacting an organopolysiloxane having an average of at least 3 silicon hydride (SiH) groups per molecule, a polyoxyethylene, and a catalyst. Said process makes it possible to manufacture SiH-Containing Silicone-EO Copolymer with PEO Grafted on Silicone Chain.
• SiH silicon hydride
• Prior art document US 2009/0234089 Al discloses a hydrophilic polysiloxane macromonomer containing polyoxyethylene as a hydrophilic side chain in a polysiloxane main chain.
• Prior art document EP 3 418 319 Al discloses a polysiloxane compound containing polyoxyethylene groups and terminal (meth)acrylic groups linked to the silicon atom by a link containing an arylene group.
• Prior art document US 2016/0311981 Al discloses a polysiloxane which has polymerizable groups at both terminal places and a hydrophilic side chain, which has an alkyl group having three hydroxyl groups and no ether bond.
• Prior art document WO 2022/141795 Al discloses is a polysiloxane compound containing polyoxyethylene groups and one (meth)acrylic group in terminal places only, but not as side chain.
• Another object of the present invention is a method for manufacturing the functionalized organopolysiloxane as disclosed above, wherein said method comprises the following steps: 1) the hydrosilylation of an organohydrogenpolysiloxane compound with an alkenyl glycidyl ether and alkenylpolyether, and 2) the (meth)acrylation on the epoxy function of the glycidyl ether.
• the present invention further relates to the use of said functionalized organopolysiloxane, as such or in the preparation of silicone gels, rubbers, coatings and emulsions, useful in different applications such as cosmetics, personal care, medical, house care, textile, electronics, coatings, construction, surfactants, antifoams, emulsifiers. Additionally, the present invention further relates to the use of said functionalized organopolysiloxane, as such or in the preparation of an ophthalmic lens material. Detailed description of the invention
• the viscosities of the silicone compositions and their individual constituents described herein correspond to a “Newtonian” dynamic viscosity magnitude at indicated temperature, i.e. the dynamic viscosity which is measured, in a manner that is known per se, with a Haak rheometer at a shear rate gradient that is low enough for the measured viscosity to be independent of the shear rate gradient.
• the viscosity can be measured with a rheometer Haak with conic/plate 60mm geometry, by applying a sinusoidal stress of 1 Pa at 1 Hz.
• the object of the present invention is a functionalized organopolysiloxane comprising:
• the R'' 11 ' 1 group as defined above is a hydroxy -containing (meth)acrylic group that is represented either by formula (VII) or by formula (VIII).
• (meth)acrylic groups comprise acrylic groups, methacrylic groups or a mixture of the two.
• the groups represented by formula (VII) and by formula (VIII) are isomers which might result from the manufacturing step.
• R met can be the group of formula (VII), the group of formula (VIII), or a mixture of both. In case of a mixture, the group of formula (VII) can be the main group, typically above 75%.
• R PE group as defined above contains a poly ether structure, providing interesting hydrophilic properties to the functionalized organopolysiloxane according to the invention.
• n is the number of oxy ethylene (OE) units
• o is the number of oxypropylene (OP) units, (OE) and/or (OP) units forming a polyether side chain
• n and o are zero or numbers such that 4 ⁇ (n+o) ⁇ 100, preferably 5 ⁇ (n+o) ⁇ 30, and more preferably 6 ⁇ (n+o) ⁇ 20.
• o is zero, i.e. the R PE group only contains OE units.
• n is zero, i.e. the R PE group only contains OP units.
• n and o are both different from zero, i.e. the R PE group contains both OE and OP units. In that case, the arrangement of the OE units and OP units can be random, or can form blocks, or random and block configurations may coexist.
• the functionalized organopolysiloxane according to the present invention comprises at least the units of formula (I) to (VI), and the number of each unit is defined by the numbers a to f respectively.
• a is the number of units of formula (I), a is a number such that 0 ⁇ a ⁇ 2. Preferably, 0 ⁇ a ⁇ 1. More preferably, 0 ⁇ a ⁇ 0.5. According to one embodiment, a is zero, i.e. the functionalized organopolysiloxane can be free, or substantially free, of units of formula (I). Nevertheless, traces or non-significant amounts of units of formula (I) might remain.
• b is the number of units of formula
• b is a number such that 0 ⁇ b ⁇ 2.
• c is the number of units of formula
• c is a number such that 0 ⁇ c ⁇ 2.
• c is zero, i.e. the functionalized organopolysiloxane can be free, or substantially free, of units of formula (III).
• c is different from zero.
• b+c is strictly above 1, preferably 1 ⁇ (b+c) ⁇ 2, more preferably 1.5 ⁇ (b+c) ⁇ 2, even more preferably 1.7 ⁇ (b+c) ⁇ 2.
• b > c i.e.
• d is a number such that 10 ⁇ d ⁇ 500.
• e is the number of units of formula
• e is a number such that 0 ⁇ e ⁇ 100. Preferably, 0 ⁇ e ⁇ 10. More preferably, 0.1 ⁇ e ⁇ 5. According to one embodiment, e is zero, i.e. the functionalized organopolysiloxane can be free, or substantially free, of units of formula (V). According to another embodiment, e is different from zero.
• f is the number of units of formula
• (VI). f is a number such that 1 ⁇ f ⁇ 100. Preferably, 1 ⁇ f ⁇ 50. More preferably, 1 ⁇ f ⁇ 20.
• the functionalized organopolysiloxane is such that, preferably, 0 ⁇ a ⁇ 1; 0.5 ⁇ b ⁇ 2; 0 ⁇ c ⁇ 1.5; 10 ⁇ d ⁇ 200; 0 ⁇ e ⁇ 10 and 1 ⁇ f ⁇ 50; and more preferably 0 ⁇ a ⁇ 0.5; 1 ⁇ b ⁇ 2; 0.3 ⁇ c ⁇ 1; 20 ⁇ d ⁇ 100; 0.1 ⁇ e ⁇ 5 and 1 ⁇ f ⁇ 20.
• a can be 0, i.e. the functionalized organopolysiloxane according to the invention can be substantially free of siloxy units of formula (I).
• the functionalized organopolysiloxane according to this embodiment advantageously does not comprise non-reactive termination.
• a and c can be both 0, i.e. the functionalized organopolysiloxane according to the invention can be substantially free of siloxy units of formula (I) and of siloxy units of formula (III) .
• the functionalized organopolysiloxane according to this embodiment advantageously comprises only (meth)acrylic groups as termination.
• c and e can be both 0, i.e. the functionalized organopolysiloxane according to the invention can be substantially free of siloxy units of formula (III) and of siloxy units of formula (V).
• the functionalized organopolysiloxane according to this embodiment can be advantageous since (meth)acrylic groups are only on terminal positions and polyether groups are only pendent groups within the chain.
• the content of polyether groups within the functionalized organopolysiloxane has an effect on the hydrophilic property of the polymer.
• One method to define the content of polyether groups is to calculate the ratio between the weight of polyether chains and the total weight of the polymer.
• the content of polyether groups of the functionalized organopolysiloxane according to the invention is between 10wt.% and 70wt.%, preferably between 30wt.% and 50wt.% (weight of the polyether groups vs. total weight of the polymer).
• the functionalized organopolysiloxane according to the invention is a linear organopolysiloxane. Consequently, it is preferably free, or substantially free, of siloxy units of formula RSiOaa, (wherein the symbol R is as described above, commonly referred to as T units), and siloxy unit of formula SiCfia (commonly referred to as T units).
• the functionalized organopolysiloxane according to the invention can have a dynamic viscosity at 25°C of between 100 mPa.s and 50 000 mPa.s, preferably between 500 mPa.s and 10 000 mPa.s, and more preferably between 500 mPa.s and 5 000 mPa.s.
• Said functionalized organopolysiloxane according to the invention can preferably be referred to as an organopolysiloxane oil.
• the structure of the functionalized organopolysiloxane according to the invention as defined above is a statistic structure.
• the arrangement of the siloxy units can be random, or can form blocks, or random and block configurations may coexist.
• the numbers a to f of each siloxy unit within the functionalized organopolysiloxane are average values, providing therefore an average structure of the functionalized organopolysiloxane.
• Such average structure can be determined, as commonly known by the person skilled in the art, with the aid of NMR analyses.
• the functionalized organopoly siloxane according to the present invention can be manufactured by any process known by the person skilled in the art.
• the functionalized organopolysiloxane according to the invention can be obtained by a two-step process comprising 1) the hydrosilylation of an organohydrogenpoly siloxane compound with an alkenyl glycidyl ether and alkenylpolyether, and 2) the (meth)acrylation on the epoxy function of the glycidyl ether.
• the functionalized organopolysiloxane according to the invention can be obtained starting from an organohydrogenpolysiloxane compound comprising:
• Said organohydrogenpolysiloxane compound can be purchased from silicone manufacturer or produced according to general methods known by the person skilled in the art.
• the alkenyl glycidyl ether is preferably the allylglycidyl ether.
• the reaction with the alkenyl glycidyl ether and with an alkenylpolyether can be carried out simultaneously or sequentially. According to one embodiment, the reaction can be carried out sequentially by first reacting the organohydrogenpolysiloxane compound with the alkenyl glycidyl ether, and then adding the alkenylpolyether.
• the temperature of the hydrosilylation can be comprised between 0°C and 150°C, preferably between 20°C and 100°C, in the presence of a hydrosilylation catalyst.
• the hydrosilylation catalyst can in particular be selected from platinum and rhodium compounds but also from silicon compounds, such as those described in the patent applications WO 2015/004396 and WO 2015/004397, germanium compounds, such as those described in the patent application WO 2016/075414, or nickel, cobalt or iron complexes, such as those described in the patent applications WO 2016/071651, WO 2016/071652 and WO 2016/071654.
• the catalyst is preferably a compound derived from at least one metal belonging to the platinum group. These catalysts are well known.
• the hydrosilylation catalyst is a compound derived from platinum.
• the hydrosilylation catalyst is a Karstedt platinum catalyst.
• the amount of the hydrosilylation catalyst can be preferably in the range from 2 ppm to 400 ppm, preferably from 5 ppm to 200 ppm, calculated as weight of platinum metal, with respect to the total weight of the reaction medium.
• the contents of alkenyl glycidyl ether and alkenylpolyether are such that, for 1 molar equivalent of SiH groups within the organohydrogenpolysiloxane compound, the reaction is carried out with an excess of alkenyl glycidyl ether and alkenylpolyether.
• the excess unreacted of alkenyl glycidyl ether and/or alkenylpolyether, and optionally non- reactive silicone volatiles can be distilled out or stripped, typically using vacuum.
• An intermediate functionalized or ganopoly siloxane compound can be obtained at the end of hydrosilylation step 1).
• Said intermediate compound is similar to the functionalized organopolysiloxane according to the present invention since it comprises:
• R EPOX , wherein p is as defined above.
• the second step of the process for obtaining the functionalized or ganopoly siloxane according to the invention comprises the (meth)acrylation on the epoxy function of the glycidyl ether.
• (Meth)acrylation by opening of an epoxy group is a reaction which has been often described in the literature.
• organopolysiloxanes comprising a meth(acrylate) function can be industrially obtained by reaction between an epoxy -group-functionalized organopolysiloxane and (meth)acrylic acid in the presence of a chromium-based catalyst.
• This reaction is for example described in the article “Synthesis and characterization of a vinyl ester resin with an oligo(dimethy 1 siloxane) backbone”, by Rao et al, Makromol. Chem., Rapid Commun.
• organopolysiloxane with chain-end epoxy functions reacts with methacrylic acid in the presence of chromium diisopropyl salicylate so as to form an a,co-bis(methacrylate)-substituted organopolysiloxane.
• the patent US 6,548,568 also teaches the preparation of organopolysiloxanes comprising an acrylate function by reaction between an organopolysiloxane having epoxy functions and acrylic acid in the presence of chromium (III) acetate. The reaction was carried out in a solvent, which is a mixture of n-butanol and methyl isobutyl ketone. Hydroquinone is added as polymerization inhibitor of (meth)acrylic acid.
• a cyclic diamine such as l,4-diazabicyclo(2,2,2)octane is widely exemplified as catalyst for this reaction.
• US 10,738,217 describes the use as catalyst of a complex of iron in the oxidation state (III).
• the intermediate functionalized organopolysiloxane compound according to the reaction can be reacted, at a temperature of between 25°C and 130°C, preferably between 50°C and 130°C, and even more preferentially between 70°C and 125°C, with acrylic acid or methacrylic acid or a mixture of the two, in the presence of an appropriate catalyst, which is preferably a chromium-based catalyst.
• the reaction can be carried out using at least one, preferably one to ten, mole (meth)acrylic acid per one mole epoxy groups in said intermediate functionalized organopolysiloxane compound.
• a polymerization inhibitor can be used, for example, methoxyphenol, phenothiazine, hydroquinone, or tert-butylpyrocatechol.
• the functionalized organopolysiloxane according to the present invention is obtained at the end of the (meth)acrylation step 2).
• additional purification steps can be carried out either between step 1) and step 2), or after step 2), or both.
• the method for manufacturing the functionalized organopolysiloxane according to the present invention can comprise a purification step 1’), between hydrosilylation step 1) and (meth)acrylation step 2).
• the purification step 1 ’) can be carried out by any method known by the person skilled in the art, for example by precipitation with organic solvents, such as acetone, filtration and washing, extraction in a suitable solvent, dialysis, reverse osmoses or ultrafiltration, or any combination of these methods.
• the intermediate functionalized organopolysiloxane compound according to the invention can be obtained in a pure form, for example in the form of concentrated solutions that are free, or at least substantially free, from starting materials and/or from secondary products formed during the hydrosilylation step. It is possible for the purification step to be carried out repeatedly, for example from two to ten times. Alternatively, the purification step can be carried out continuously until the selected degree of purity is attained. The selected degree of purity can, in principle, be as high as desired.
• the method for manufacturing the functionalized organopolysiloxane according to the present invention can comprise a purification step 2’) after (meth)acrylation step 2).
• the purification step 2’) can consist in a devolatilization step, which makes it possible to evaporate off the solvent and the excess (meth)acrylic acid when present.
• the solvent can optionally be recycled.
• a devolatilization step can be carried out according to any method know by the person skilled in the art, for instance by distillation at appropriate temperature under reduced pressure. Further filtration step can also be carried out.
• the functionalized organopolysiloxane according to the present invention can be of high interest for several technical fields.
• the functionalized organopolysiloxane according to the present invention at least differs by the link between the polysiloxane main chain and the (meth)acrylic groups: whereas US 2009/0234089 Al provides a propylene bond, optionally with a few polyoxyethylene groups (m -(C2H4O)- groups, wherein m is 0 to 10 in US 2009/0234089 Al), the functionalized organopolysiloxane according to the present invention comprises (meth)acrylic acid monoester comprising a hydroxyl group in the vicinal position. Without wishing to be bound by any theory, it is believed that the presence of a hydroxyl group in the vicinal position of the (meth)acrylic group provides improved properties, for instance improved hydrophilicity.
• the (meth)acrylate functions are capable of reacting via the radical process under actinic and/or thermal activation according to a polyaddition polymerization mechanism.
• the functionalized organopoly siloxane according to the present invention can be used as such or in the preparation of silicone gels, rubbers, coatings and emulsions, useful in different applications such as cosmetics, personal care, medical, house care, textile, electronics, coatings, construction, surfactants, antifoams, emulsifiers, etc.
• the functionalized organopoly siloxane according to the present invention is suitable as a constituent or additive for cosmetics, such as hairsprays, creams, lotions, gels, hair conditioner or hair setting composition.
• the functionalized organopoly siloxanes are furthermore suitable as release agents and coating materials. They are also suitable for the coating of textile, paper, wood, plastics or sheets and metals. They can be used as adhesion promoters, or as slip agent and wetting agent for paints or varnishes.
• silicone coatings to create release coatings (non-stick coatings) on the surface of a substrate material
• the preparation of silicone release coatings is generally carried out as follows: a silicone composition is applied to a substrate within an industrial coating device comprising rollers operating at very high speed. Once applied to the substrate, the silicone composition is cured to form a solid silicone release coating.
• the coated substrate obtained is also called a silicone liner.
• This silicone liner can in particular be laminated with an adhesive, because the silicone release coating facilitates the removal of adhesive materials reversibly bonded onto these substrates.
• These silicone liners can thus be used in the field of self-adhesive labels, strips including envelops, graphic arts, medical care and health care applications.
• the silicone compositions used to form release coatings are generally cured (crosslinked) under radiation, in particular under UV or visible radiation emitted by doped or undoped mercury vapor lamps or by LED (Light-Emitting Diodes).
• the present invention relates to the use of the functionalized organopoly siloxane as described in the present application for the preparation of a silicone coating capable of being used as a release coating on a substrate.
• the invention also relates to a method for preparing a coating on a substrate, comprising the following steps: comprising the following steps: applying on a substrate a silicone composition comprising the functionalized organopolysiloxane as described in the present application; and curing said composition.
• the invention also relates to a coated substrate that can be obtained by this method. Further fields of use are in the building sector as an additive in cement-containing and non-cementcontaining systems and for the protection of structures, in particular for the production of weatherresistant coatings or sealing compounds.
• the functionalized organopolysiloxanes according to the present invention are particularly suitable as hydrophilizing softeners for textiles.
• Synthetically produced fibers such as polyester, polyamide or polyolefin fibers
• the textiles are rendered hydrophilic thereby, perspiration can be absorbed and furthermore the textiles acquire a pleasant soft handle.
• the functionalized organopolysiloxanes are also suitable as an anti-wrinkling agent in the textile sector.
• the functionalized organopolysiloxanes according to the present invention are particularly suitable as an ophthalmic lens material.
• the expression “ophthalmic lens” refers typically to any lens fitted to the anterior eye segment for purposes such as vision correction, test and therapy, and preferably include an intraocular lens, a corneal lens and a contact lens.
• the present invention further relates to an ophthalmic lens material comprising at the functionalized organopolysiloxanes as disclosed above, and to an ophthalmic lens comprising said material, in particular a contact lens.
• MIBK 4-methylpentan-2-one
• Step 1 Preparation of 1(CH 3 ) 3 SiOi/21O, 3 1(CH 3 ) 2 R EPOXY SiOidi 1(CH 3 ) 2 R PEG11 SiOido ? 1(CH 3 ) 2
• the temperature was raised to 40°C. 34.6 mg of a Karstedt catalyst solution was added, and the reaction medium was stirred.
• the product was purified by dialysis, and finally distilled.
• Step 2 Preparation of [(CH 3 ) 3 SiOm Io 3 1(CH 3 ) 2 ' SiOml j 1(CH 3 ) 2 R PEGn SiOi/ 2 l 07 [(CH 3 ) 2 SiO 2/2 1 2 9 [(CH 3 ) R MI T SiO 2 /2ii [(CH 3 ) R PEG11 SiO 2 /2l6
• the reaction was carried out at 115°C. When the conversion of the epoxy groups was completed, the mixture was devolatilized. The content of methacrylate function was determined by 1H-NMR.
• Base silicone organopolysiloxane functionalized with acrylate groups having a viscosity of about 1000 mPa.s
• Catalyst TPOL (ethyl(2,4,6- trimethylbenzoyl)phenylphosphinate)
• PEG 12 dimethicone organopolysiloxane functionalized with polyoxyethylene groups having a viscosity of 200 to 800 mPas
• Functionalized organopoly siloxane 1 compound of general formula [(CH3)3 SiOi/2 ]o.3 [(CH3)2R MET SiOi/2] 1 [(CH 3 )2 R PEGn SiOi/ 2 ]o .7 [(CH 3 )2 SiO 2 /2]90 [(CH 3 ) R M, T SiO 2 /2]i [(CH 3 ) R PEG11 SiO 2 /2]6, prepared by a method similar as the method disclosed above.
• Silicone coating compositions were prepared by mixing the components as disclosed in Table 1 below. The figures are expressed in % by weight. The composition thus obtained were coated on a PET substrate (coating weight: 6 g/m 2 ) and then cured by undoped mercury vapor lamps. The performances of the coated substrates were evaluated:
• Ks static coefficient of friction
• Kd dynamic coefficient of friction
• Antistatic property was evaluated by measuring the static charge on the coated sample of PET film after 10 rubs with a glove. The measure is repeated a second time after 10 new rubs. The charge is measured at 10 cm by a Fraser 715 Static Meter (value in kV).
• composition C a functionalized organopolysiloxane according to the present invention

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