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
  • C08G77/04—Polysiloxanes
  • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
  • C08J7/04—Coating
  • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
• • 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
  • C09D183/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2483/00—Characterised by the use of 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; Derivatives of such polymers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31652—Of asbestos
  • Y10T428/31663—As siloxane, silicone or silane
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2221—Coating or impregnation is specified as water proof
  • Y10T442/223—Organosilicon containing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2311—Coating or impregnation is a lubricant or a surface friction reducing agent other than specified as improving the "hand" of the fabric or increasing the softness thereof
  • Y10T442/2328—Organosilicon containing

Definitions

• the field of the invention is that of crosslinkable or crosslinked silicone compositions which can be used, in particular, to form a water-repellent and non-stick coating or film for fibrous support or not, for example made of paper or the like, or else in natural or synthetic polymer.
• the invention relates to silicone compositions of the type of those comprising: functionalized polyorganosiloxanes (POS) carrying, on the same molecule or not, Si-H and Si-IE units with IE representing a group comprising at least one unsaturation -ethylenic, preferably vinyl; the Si-H units being capable of reacting with the Si-IE units by polyaddition; a suitable metallic catalyst, preferably platinum; optionally at least one adhesion modulator system, for example based on silicone resin comprising siloxyl units Q: (SiO 4 2 ) and / or T: (RSiO 3/2 ); possibly other additives (fillers, accelerators, inhibitors, pigments, surfactants ).
• POS functionalized polyorganosiloxanes
• IE representing a group comprising at least one unsaturation -ethylenic, preferably vinyl
• a suitable metallic catalyst preferably platinum
• optionally at least one adhesion modulator system for example based on silicone resin comprising siloxy
• the invention also relates to the methods for manufacturing crosslinked silicone articles, in particular coatings, e.g. water-repellent and / or non-stick coatings for flexible or non-fibrous supports (paper or polymer film), from the above-mentioned compositions.
• coatings e.g. water-repellent and / or non-stick coatings for flexible or non-fibrous supports (paper or polymer film)
• liquid silicone compositions (with / without solvent or in aqueous emulsion) are applied to the support films in industrial coating devices comprising rollers operating at very high speed (for example 600 m / min). It is clear that in these very high speed coating procedures, the viscosity of the liquid silicone coating composition must be carefully adapted to the coating operating conditions.
• the liquid silicone coating compositions in which we are more particularly interested in the context of the invention are solvent-free.
• the silicone phase of these liquid silicone coating compositions may be diluted in a solvent.
• the liquid silicone composition is an aqueous dispersion / emulsion.
• the deposition rate of non-stick silicone is between 0.1 and 2, preferably 0.3 and 1 g / m, which corresponds to thicknesses of the order of a micrometer.
• the crosslinking kinetics must be instantaneous and the crosslinking must be correct, that is to say that the non-stick silicone films must be sufficiently crosslinked to be able to fill at best their anti-adhesion function and possess the desirable mechanical qualities.
• the assessment of the quality of the crosslinking of the non-stick silicone film can in particular be done through the dosage of extractable non-crosslinked compounds, the quantity of which must be as small as possible.
• the anti-adhesion of the free external face of the silicone coating is expressed through the release force, which must be low and controlled, for the element intended to be placed on the support coated with the non-stick silicone film.
• this element can be the adhesive side of a label or a ribbon of the same name.
• the adhesion of the silicone coating on its support must be very high. This adhesion property can be assessed, for example, using the "rub off" trade test, which consists of rubbing the surface of the coating with a finger and measuring the number of successive passes which lead to degradation of the coating. .
• silicone coating compositions crosslinkable by hydrosilylation eg ⁇ Si-H / ⁇ Si-Vi, have a lifetime at room temperature as long as possible, when they are in the form of coating bath in industrial coating machines.
• the flexible supports coated with a non-stick silicone film can for example be:
• an adhesive tape the internal face of which is coated with a layer of pressure-sensitive adhesive and the external face of which has the non-stick silicone coating;
• - or a paper or a polymer film for protecting the adhesive face of a pressure-sensitive adhesive or adhesive element;
• the level of platinum is reduced to a rate less than 100 or even 80 ppm in the composition, it is then no longer possible to obtain non-stick silicone coatings and / or water repellent, perfectly cross-linked.
• crosslinking agents of the type of those comprising siloxy units is already disclosed: dimethylhydrogenosiloxy (M '), methylhydrogenosiloxy (D'), dimethylsiloxy (D) and trimethylsiloxy (M), for crosslinkable liquid silicone compositions by polyaddition ( ⁇ Si-H / Si- Vinyl), to form non-stick coatings on flexible supports (coated or uncoated papers, polymer films ).
• EP-A-0 523 660 there is no particular POS POSSi-H crosslinking agent which confers advantageous properties on the crosslinked coating, in terms of reduced extractable content and duration of stability of the silicone composition bath. coating liquid, in particular.
• the essential objective of the present invention is to propose a new use of particular POS ⁇ Si-H as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating for flexible support, under thermal activation, with a low level of metallic catalyst (eg Pt), instantaneously and leading to crosslinked silicone coatings of very good quality, characterized by reduced extractable rates and moreover provided with excellent properties of attachment, in particular on smooth supports, for example in glassine paper by Lissé BEKK greater than 1000.
• Another essential objective of the invention is to propose a new use of
• POS ⁇ Si-H particular as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating for flexible support, under thermal activation, with low levels of metallic catalyst (eg Pt), instantaneously while having long lifetimes in the bath, at room temperature.
• Another essential objective of the invention is to propose a new use of
• POS ⁇ Si-H particular as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating, for flexible support, under thermal activation, with low level of metallic catalyst (eg Pt), of instantly and leading to correctly crosslinked silicone coatings and having entirely satisfactory anti-adhesion properties.
• metallic catalyst eg Pt
• Another essential objective of the invention is to propose a new use of particular POS ⁇ Si-H as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating for flexible support, under activation thermal, with low levels of metallic catalyst (eg Pt), instantaneously and leading to silicone coatings crosslinked correctly and having bonding properties, entirely satisfactory.
• metallic catalyst eg Pt
• Another essential objective of the invention is to propose a new use of particular POS ⁇ Si-H as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating for flexible support, under activation thermal, with low levels of metallic catalyst (eg Pt), instantaneously and leading to silicone coatings crosslinked correctly and having mechanical properties, entirely satisfactory.
• Another essential objective of the invention is to propose a new use of
• POS ⁇ Si-H particular as crosslinking agents in liquid silicone coating compositions, crosslinkable in non-stick and / or water-repellent coating for flexible support, under thermal activation, with low levels of metallic catalyst (eg Pt), instantly and leading to silicone coatings crosslinked correctly and having water repellency properties, quite satisfactory.
• metallic catalyst eg Pt
• Another essential objective of the invention is to propose a new liquid silicone coating composition, crosslinkable in non-stick and / or water-repellent coating for flexible support, under thermal activation, with low levels of metallic catalyst (eg Pt), instantaneously, this composition also having the same qualities as those mentioned above for use.
• metallic catalyst eg Pt
• Another essential objective of the invention is to propose a new liquid silicone coating composition, crosslinkable in non-stick and / or water-repellent coating for flexible support, under thermal activation, with low levels of metallic catalyst (eg Pt), instantly, this composition also being easy to prepare and economical.
• metallic catalyst eg Pt
• Another essential objective of the invention is to propose a production process, under thermal activation, with low levels of metallic catalyst (e.g. Pt), of crosslinked non-stick and / or water-repellent silicone coatings, on flexible supports.
• metallic catalyst e.g. Pt
• the present invention which firstly relates to a new use as a crosslinker (1.2), in a silicone composition capable of crosslinking by polyaddition, to form a coating, water-repellent and non-stick.
• a crosslinker for fibrous support or not, ⁇ of at least one silicone oil comprising at least one (preferably linear) hydrogenated PolyOrganoSiloxane (POS) having, per molecule, at least three hydrogen atoms bonded to silicon, and preferably of the following average formula:
• the metal catalyst level being less than or equal to 80 ppm, preferably less than or equal to 65 ppm, and, more preferably still between 30 and 55 ppm.
• these new POS ⁇ Si-H crosslinkers do not modify the rheological behavior of the silicone composition, so that it is perfectly suitable for being coated on any support and in particular on any flexible support.
• This latter property is all the more advantageous since, in the context of the invention, the silicone coating compositions can advantageously be "solvent-free". This means that they are solvent-free and, in particular, solvent-free organic. It is easy to see the advantages that this provides in terms of health and safety.
• the use according to the invention is distinguished by the fact that the silicone composition used can be transformed according to a determined methodology M, into a crosslinked elastomeric silicone coating, on a paper support whose smoothness BEKK is greater than 1000 , said coating being characterized by a positive attachment in a determined T test.
• the POS crosslinker ⁇ Si-H (1.2) comprises the M M'D D 'units on the same POS molecule (preferably linear), the crosslinker possibly comprising one or more M M'D D molecules 'different, * -b- the cases where the POS crosslinker ⁇ Si-H (1.2) is formed by a mixture of POS molecules (preferably linear) each carrying a part of the units M M'D D', -c - the cases where the POS ⁇ Si-H (1.2) crosslinker is formed by a mixture of POS ⁇ Si-H (1.2) crosslinkers (preferably linear) of types -a- and -b-, as described above .
• POS ⁇ Si-H (1.2) crosslinkers of type -b- mention may be made of mixtures of POS ⁇ Si-H comprising units M and D 'and of POS comprising units M, D and D 'or mixtures of POS ⁇ Si-H (1.2) comprising units M and D and POS comprising units M', D and D ', or mixtures of POS ⁇ Si-H (1.2) comprising units M and D 'and POS comprising units M and D, or mixtures of POS ⁇ Si-H (1.2) comprising units M' and D 'and POS comprising units M and D.
• the crosslinker (1.2) comprises hydrogenated POS motif-bearing T: RSiO 3/2 or Q: SiO 4/2. It can be, for example, POS ⁇ Si-H (1.2) of structure M'DD'QM '.
• the crosslinker with patterns M 'and D' according to the invention can also comprise standard crosslinkers POS ⁇ Si-H (1.2) having no M 'functions.
• the silicone composition involved in the use according to the invention consists of POS ⁇ Si-H (1.2) and POS ⁇ Si-alkenyl (1.1) (eg Vi), of linear structure - possibly branched -, to exclusion of POS ⁇ Si-H (1.2) and POS ⁇ Si-alkenyl (1.1) (eg Vi) having a network cross-linked structure.
• the support intended to be coated is made of thermosensitive material, preferably flexible, and, more preferably still chosen from flexible supports made of paper, cardboard or the like, the flexible supports constituted by the adhesive face of '' a label or a ribbon of the same name, flexible fibrous supports woven or not, flexible supports comprising polyethylene and / or polypropylene and / or polyester and / or polyvinyl chloride, and / or flexible supports thermally printable.
• the support coated with the polyaddition silicone composition is placed at a temperature greater than or equal to 110 ° C, preferably between 110 and 250 ° C, and more preferably still between 130 and 170 ° C, for less than 60 seconds, preferably less than 10 seconds.
• the silicone composition is a mixture formed of: (1.1) at least one POS having, per molecule, at least two alkenyl groups
• At least one POS (1.1) of Si-alkenyl type for example Si-Vi
• at least one POS (1.2) of Si-H type is used.
• POS (1.1) is by weight one of the essential constituents of the formulation.
• this POS (1.1) is a product comprising units of formula:
• W is an alkenyl group, preferably vinyl or allyl
• - Z is a monovalent hydrocarbon group, free of unfavorable action on the activity of the catalyst and preferably chosen from alkyl groups having from 1 to 8 carbon atoms included , advantageously, among the methyl, ethyl, propyl and 3,3,3-trifluoropropyl groups and also among the aryl groups and, advantageously, among the xylyl and totyl and phenyl radicals, a is 1 or 2, b is 0, 1 or 2 and a + b is between 1 and 3.
• this polydiorganosiloxane prefferably has a viscosity (at 25 ° C.) at least equal to 10 mPa.s, preferably between 50 and 1,000 mPa.s.
• the polyorganosiloxane (1.1) can have a linear, branched or cyclic structure. Its degree of polymerization is preferably between 2 and 5000.
• siloxyl units of formula (1.1) are the vinyldimethylsiloxane unit, the vinylphenylmethylsiloxane unit and the vinylsiloxane unit.
• polyorganosiloxanes (1.1) are dimethylpolysiloxanes with dimethylvinylsilyl ends, methylvinyldimethylpolysiloxane copolymers with trimethylsilyl ends, methylvinyldimethylpolysiloxane copolymers with dimethylvinylsilyl ends, cyclic methylvinylpolysiloxanes.
• the crosslinking polyorganosiloxane (1.2) is preferably of the type of those comprising siloxyl units of formula:
• - L is a monovalent hydrocarbon group, free from any unfavorable action on the activity of the catalyst and preferably chosen from alkyl groups having from 1 to 8 carbon atoms included and, advantageously, from methyl groups, ethyl, propyl and 3,3,3-trifluoropropyl and also among the aryl groups and, advantageously, among the xylyl and totyl and phenyl radicals, - d is 1 or 2, e is 0, 1 or 2, d + a value between 1 and 3.
• the polyorganosiloxane (1.2) can have a linear, branched or cyclic structure.
• the degree of polymerization is greater than or equal to 2. More generally, it is less than 5,000.
• Examples of units of formula (1.2) are: M ': H (CH) SiOi / 2, D': HCH 3 Si ⁇ 2 / 2, D ': H (C6H 5 ) Si ⁇ 2 / 2.
• polyorganosiloxane (1.2) examples include: - M'DD ': dimethylpolysiloxanes with hydrogenodimethylsilyl ends, poly (dimethylsiloxane) (methylhydrogenosiloxy) ⁇ , ⁇ -dimethylhydrogeno-siloxane,
• the bases of polyaddition silicone compositions may contain only linear polyorganosiloxanes (II) and (1.2) such as, for example, those described in the patents: US-A-3,220,972, US-A-3,697,773 and US-A- 4,340,709.
• the catalysts (II) are also well known.
• the compounds of platinum and rhodium are preferably used. It is possible, in particular, to use the complexes of platinum and of an organic product described in patents US-A-3,159,601, US-A-3,159,602, US-A-3,220,972 and European patents EP- A-0 057 459, EP-A-0 188 978 and EP-A-0 190 530, the complexes of platinum and vinylated organosiloxanes described in the patents US-A-3,419,593, US-A-3,715,334 , US-A-3,377,432 and US-A-3,814,730.
• the generally preferred catalyst is platinum.
• the quantity by weight of catalyst (H), calculated by weight of platinum-metal is generally between 2 and 400 ppm, preferably between 5 and 200 ppm based on the total weight of the polyorganosiloxanes (II) and (1.2 ).
• the crosslinking POS has a ⁇ Si-H / ⁇ Si-alkenyl (Vi) molar ratio, such as:
• the POS (II) is a linear polydiorganosiloxane blocked with "Si-alkenyl" functions - preferably located at the end of the chain -, having a viscosity of the order of 100 to 1000 mPas and a rate of alkenyl functions t a , expressed in number of equivalent of alkenyl functions per 100 g of oil:
• ⁇ t a preferably 0.015 ⁇ t a ⁇ 0.04 and even more preferably 0.015 ⁇ t a ⁇ 0.1.
• the oil useful as crosslinker comprising at least one POS with iSi-H (1.2) functions has - preferably - a viscosity of the order of 5 to 150 mPas.
• the complete curable compositions are fluid at normal temperature; their viscosity is generally of the order of 50 to 500 mPa.s. at 25 ° C.
• the crosslinkable non-stick silicone composition contains:
• the adhesion modulator system (III) is selected from known systems. These may be those described in French patent FR-B-2 450 642, US patent -B- 3 772 247 or European patent application EP-A-0 601 938. By way of examples, may include modulators based on: o from 96 to 85 parts by weight of at least one reactive polyorganosiloxane resin (A) of type: MD vi Q, MM Vi Q, MD vi T, MM Héxén yleQ, 0 or MM AllyloxypropyleQ. o from 4 to 15 parts by weight of at least one non-reactive resin (B) of the type: MD'Q, MDD'Q, MDT ', MQ, or MDQ.
• A reactive polyorganosiloxane resin
• B non-reactive resin
• the retarder of the addition reaction (IV) (crosslinking inhibitor) can, for its part, be chosen from the following compounds: polyorganosiloxanes, advantageously cyclic and substituted with at least one alkenyl, tetramethylvinyltetrasiloxane being particularly preferred, pyridine, phosphines and organic phosphites, unsaturated amides, alkyl maleates and acetylenic alcohols.
• acetylenic alcohols (cf. FR-B-1 528 464 and FR-A-2 372 874), which are part of the preferred hydrosilylation reaction thermal mockers, have the formula:
• R 1 is a linear or branched alkyl radical, or a phenyl radical
• R 2 is H or a linear or branched alkyl radical, or a phenyl radical
• the total number of carbon atoms contained in R and R being at least 5, preferably from 9 to 20.
• Said alcohols are preferably chosen from those having a boiling point above 250 ° C.
• Such a retarder is present at a rate of 3000 ppm at most, preferably at the rate of 100 to 2000 ppm relative to the total weight of the organopolysiloxanes (I.l) and (1.2).
• the composition is in the form of an aqueous emulsion / dispersion and then comprises at least one surfactant; and optionally at least one pH-fixing agent.
• the agent for fixing and maintaining the pH is preferably a buffer system comprising HCO 3 / CO 3 and / or H 2 PO 4 / HPO 4 .
• a salt of HCO 3 "and / or H 2 PO 4 " such as for example NaHCO 3 and / or Na 2 CO 3 and / or NaH 2 PO 4 and / or Na 2 HPO 4 .
• any other salt with a different counter anion could be suitable.
• a buffer system constituted by NaHCO 3 is used in practice which is incorporated into the emulsion.
• the surfactant (s) capable of being present in the emulsion according to the invention as an emulsifying agent are of non-ionic or ionic nature.
• the proportion of water in the emulsion is greater than or equal to 50% by weight, preferably greater than or equal to 55% by weight and for example in practice of the order of 55 - 60% by weight or even 85 to 90% by weight.
• the invention relates to a silicone composition capable of crosslinking by polyaddition, to form a coating, water-repellent and non-stick for fibrous support or not, characterized: in that it comprises: (II) at least a POS having, per molecule, at least two alkenyl groups (preferably C2-C6) linked to silicon, (1.2) of at least one silicone oil: • comprising at least one linear hydrogenated PolyOrganoSiloxane (POS) having, per molecule , at least three hydrogen atoms bonded to silicon, • and of the following average linear formula:
• At least one catalyst (II) composed of at least one metal belonging to the platinum group; said catalyst being present at a metal catalyst level being less than or equal to 80 ppm, preferably less than or equal to 65 ppm, and, more preferably still between 30 and 55 ppm. and in that the POS (s) with the highest viscosity that it contains, has (have) a dynamic viscosity ⁇ at 25 ° C less than or equal to 1500 mPa.s.
• the present invention relates to a process for preparing a silicone composition, which can be used in particular as a coating base for the production of non-stick and water-repellent coatings, this composition being of the type defined above.
• at least one POS (II) ⁇ Si-Vi oil preferably linear
• the crosslinker constituted by at least one POS (1.2) ⁇ Si-H oil of MM'DD type and or by a mixture of oils comprising POS molecules (preferably linear) each carrying a part of the M M'D D 'units contained in the crosslinker.
• the catalyst (II) is also incorporated into the silicone phase, with any other ingredients such as crosslinking inhibitors.
• the mixing means and methodologies are known to those skilled in the art, whether they are compositions with / without solvent or emulsion.
• compositions can be applied using devices used on industrial paper coating machines such as a five-roller coating head, air knife or equalizer bar systems, on supports or materials.
• Said compositions can be deposited on any flexible material or substrate such as papers of various types (supercalendered, coated, glassine), cardboards, cellulose sheets, metal sheets, plastic films (polyester, polyethylene, polypropylene ). ..
• compositions deposited are of the order of 0.5 to 2 g per m 2 of surface to be treated, which corresponds to the deposition of layers of the order of 0.5 to 2 ⁇ m.
• the materials or supports thus coated can subsequently be brought into contact with any adhesive, rubber, acrylic or other, pressure-sensitive materials.
• the adhesive material is then easily detachable from said support or material.
• the present invention relates to a support characterized in that it comprises at least one non-stick coating obtained:
• the temperature of the silicone layer is measured online using an infrared camera.
• the temperature of the support is of the order of 150 ° C.
• Weight of the silicone coating The silicon atoms of the coating are excited using a radioactive source or a fluorescent tube X and the intensity X re-emitted by the coating is measured. By means of a calibration, the weight of the silicone coating is thus determined.
• the apparatus used has for reference Lab XI 000 marketed by the company Oxford.
• Rate of extractables (leaving the coating machine: "in-line” / 4 days after crosslinking: “off-line”): the test consists of immersing the coating in toluene and then assaying by absorption spectrophotometry atomic Perkin Elmer 3100 (the silicone having transferred into the solvent By means of a calibration, the amount of silicone extractable from the coating is accessed.
• Crosslinking we qualify the level of polymerization of the coating at the outlet of the coating machine through a number of business tests: "smear" where we qualify the oily nature of the surface by passing the finger on the surface silicone.
• Peel strength corresponds to Finat standards n ° 3 and 10 of edition n ° 5 of 1999. This test is carried out 4 days after crosslinking ("off- line ”) with adhesive tapes sold under the brand Tesa® 7475 at 23 ° C (acrylic base), Tesa® 7476 at 70 ° C (rubber base). Control of instant adhesion performance without PSA" tack "pressure after contact with the silicone coating according to standard No. 9 of the Finat edition No. 5 of 1999.
• Modulator (III) mixture of vinylated silicone oil and of a vinylized MQ resin (50/50 mixture), containing 0.107 vi / 100g groups. this modulator contains 0.15% ECH inhibitor (IV). • Catalyst (II): Pt Karstedt containing 2000 ppm of Pt.
• crosslinkers are formulated with vinyl oil ((II), the modulator (1.3) and the catalyst
• crosslinkers (1.2) according to the invention of structure POS ⁇ Si-H: M'MD'D make it possible to obtain the lowest extractable rates, signature of better reactivity with good attachment to the support.
• the invention provides access to crosslinkable formulations with low Pt levels.

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• Chemical & Material Sciences (AREA)
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• Wood Science & Technology (AREA)
• Paints Or Removers (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Silicon Polymers (AREA)
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