Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/203—Adhesives in the form of films or foils characterised by their carriers characterised by the structure of the release feature on the carrier layer
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/201—Adhesives in the form of films or foils characterised by their carriers characterised by the release coating composition on the carrier layer
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
  • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
  • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2301/00—Additional features of adhesives in the form of films or foils
  • C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2483/00—Presence of polysiloxane
  • C09J2483/005—Presence of polysiloxane in the release coating

Definitions

• the present invention relates to the field of adhesive tapes and more particularly relates to an adhesive tape comprising an adhesive face and another face provided with a mixed layer with anti-slip and non-stick properties, so that the adhesive face does not stick to the mixed layer when the tape is rolled up on itself.
• the present invention also relates to a method of manufacturing such an adhesive tape.
• a known solution from the prior art consists in using a sheet provided with an anti-slip face and comprising an adhesive layer on its other face.
• the adhesive side can then be glued to the floor or to the top of a cardboard box, thus leaving the non-slip side exposed.
• These products are supplied in the form of rolled up adhesive strips, convenient to handle; they include a protective support film, also called backing, liner or backing, affixed over the adhesive layer. The backing is rolled up with the adhesive tape.
• a solution to do away with the protective backing described in European patent EP 0 511 129 B 1 consists in providing a rolled up strip comprising an adhesive side and an anti-slip side obtained by coating a composition consisting of a thermoplastic resin to which microspheres have been added. hollow whose core contains a volatile fluid which expands upon heating of this composition.
• the expanded microspheres create an inhomogeneous surface which exhibits anti-slip properties.
• said inhomogeneous surface does not create sticky bridges when brought into contact with the adhesive face, which allows it to be rolled up in the form of coils.
• PSA adhesives it is known that the microspheres adhere to known PSA adhesives.
• the anti-slip properties of this tape are therefore obtained at the expense of its non-stick properties.
• the applicant has sought to develop a strip having a face endowed with an improved anti-slip effect and an anti-adherence compatible with adhesives having a stronger adhesive power, while minimizing the use of material during the application of the corresponding coatings on the backing strip.
• the present invention aims to provide a commercially viable tape comprising an adhesive face and which comprises on its other face high anti-slip properties with high anti-adhesion.
• the invention relates to an adhesive strip which comprises a support provided with a first face, called the "front face”, and a second face, called the “front face”. rear”, and in which:
• an adhesive layer covers at least part of the rear face
• the front face is covered with a so-called mixed layer resulting from two successive coatings including a so-called “anti-slip” coating and a so-called “non-stick” coating, each of which can be carried out first or second, and which form an alternation of thin parts and thick parts,
• the coating performed first covers a predetermined area of the surface of the front face and the coating performed second covers a predetermined area of the surface formed by the front face at least partially already covered by the coating performed first,
• the anti-slip coating covers an area of between 5% and 80% of the area of the front face with a first composition forming a layer having anti-slip properties, said layer having a minimum thickness of 4 ⁇ m and
• the non-stick coating covers an area of between 20% and 100% of the area of the front face with a second composition forming a layer with non-stick properties, said layer having a maximum thickness of 3 ⁇ m.
• the anti-slip coating covers an area of between 10% and 60% of the area of the front face. Very preferably, this area is between 20% and 50%. In embodiments, the Release Coating covers an area between 20% and 95% of the area of the front side.
• the mixed layer of the adhesive tape of the invention combines anti-slip properties, allowing for example to stabilize boxes during their palletization, with anti-adhesive properties. These anti-adhesive properties allow the adhesive layer to come into contact with the mixed layer and therefore the winding of the adhesive tape and its unwinding during use.
• the economic and environmental costs associated with the production of the adhesive tape are reduced by reducing the quantity of composition forming a layer having anti-slip properties used. It is understood that the reduction in the amount of chemicals used for Tenduction leads to a reduction in the cost of the diaper and a reduction in the amount of chemical product discharged in the waste, after use of the adhesive tape.
• the invention accomplishes this objective by retaining satisfactory anti-slip and non-stick properties. Indeed, the Applicant has discovered that a first anti-slip coating with a partial coverage rate was sufficient to provide satisfactory anti-slip properties, provided that this first coating has a minimum thickness.
• cover rate designates the surface area of a coating in relation to the surface area of the front face. For example, a coverage rate of 100% represents a total flatness of a coating, with an area equal to the area of the front face. Note that the “coverage rate” described above can also be called ink rate.
• the rate of coverage of the mixed layer by thick zones represents the ratio between the area covered by thick zones and the total area of the front face.
• the invention makes it possible, for an equal amount of anti-slip coating used, to improve the anti-slip properties of a surface, by producing a thicker layer of anti-slip coating on only part of the mixed layer. .
• this first coating with a second non-stick coating makes it possible to obtain good non-stick properties for the mixed layer, since the surface covered by the second coating represents at least a minimum coverage rate .
• the two coatings making up the mixed layer create an alternation of thick parts and thin parts.
• said thin parts and thick parts can be formed by the superposition of two coatings, or be formed by one coating only.
• anti-slip properties is defined as the property of a surface of presenting a certain resistance to movement when positioned flat on any support and when it is subjected to movement on this support, it being understood that this resistance is not due to the effect of a glue or any other adhesive system of this type.
• the anti-slip properties are evaluated by measuring the coefficient of friction.
• the friction coefficient is determined by the horizontal plane method for determining the static and kinetic friction coefficients according to standard NF ISO 15359: 1999. This method, well known to those skilled in the art, consists in determining the static and kinetic coefficients of friction from the measurement of the forces necessary to initiate and maintain the movement of a pad in a horizontal axis.
• non-stick properties is defined as the property of a surface of exhibiting low tackiness with a given adhesive, such that the surface exhibiting non-stick properties does not stick with said adhesive.
• a material is sticky if it is necessary to apply a substantial force by hand to detach it or if it damages the surface on which it has adhered, for example by unhooking fragments of the surface on which he joined.
• the non-stick properties are evaluated by non-stick measurement according to the FTM 3 method proposed by the European association of the self-adhesive label industry (FINAT).
• FTM 3 method proposed by the European association of the self-adhesive label industry (FINAT).
• This method known to those skilled in the art, consists in evaluating the force necessary to separate (delaminate) the silicone protector from the adhesive face, by separating, according to a standardized protocol, the components of a complex formed by an adherent strip on an adhesion surface, at a constant angle of 180° and at a speed of 300 mm/minute. The width of the strip is fixed at 25 millimeters.
• the adhesive tape according to the invention is particularly advantageous because it makes it possible, by adjusting the coverage rates and/or the thicknesses of the first coating with anti-slip properties and of the second non-stick coating, to obtain a high coefficient of friction and low adhesion. .
• the mixed layer is configured to have coefficients of friction greater than or equal to 0.5 and adhesion with the adhesive layer less than or equal to 250 gram-force per centimeter.
• the friction coefficients of the mixed layer is greater than or equal to 0.7, preferably, greater than 0.8, or 0.9, or 1 or 1.2.
• friction coefficients designates the static friction coefficient and the kinetic friction coefficient (also called “dynamic”). Depending on the anti-slip material used in the mixed layer, these friction coefficients may be similar or differ from each other.
• the composite layer is configured to exhibit an adhesion with the adhesive layer of less than or equal to 200 gram-force per centimeter, preferably less than or equal to 150 gram-force per centimeter, very preferably less than or equal to 30 gram-force per centimeter.
• composition used during anti-slip rendering comprises silicone.
• the alternation of thick parts and thin parts on the front face forms repetitive patterns.
• the anti-slip and anti-adhesive properties are substantially the same at the various locations of the mixed layer.
• the product between the coverage rate of the first coating and the thickness expressed in pm of the first coating is between 2 and 30.
• This product will also be called “P”, in the context of the present request.
• the product P is between 2 and 20, very preferably it is between 2 and 5.
• the thick parts consist of the layer deposited during one of the non-stick or anti-slip coatings and the thin parts consist of the layer deposited during the other coating.
• the thick parts are made up of the layer deposited during the anti-slip coating and the thin parts are made up of the layer deposited during the non-stick coating.
• the thick parts are only formed by the layer deposited during one of the coatings and the thin parts are formed only by the layer deposited during the other coating, unlike d other embodiments in which the layers are superimposed.
• the alternation of thick parts and thin parts forms a pattern chosen from a pattern of parallel bands between them, a herringbone pattern, a pattern of wavy lines, a checkerboard pattern or an arrangement of studs.
• the pattern is a logo, or any other pattern with a coverage rate of the thick parts strictly less than 1.
• the minimum dimension of the pattern is approximately 100 ⁇ m, compatible with current printing techniques.
• the layer formed during the anti-slip coating has a thickness of between 4 ⁇ m and 300 ⁇ m.
• the layer formed during the anti-slip coating has a thickness of between 30 ⁇ m and 100 ⁇ m.
• the layer formed during the anti-slip coating has a thickness of between 7 ⁇ m and 50 ⁇ m, very preferably this thickness is between 7 ⁇ m and 25 ⁇ m.
• the layer formed during the release coating has a thickness of between 0.1 ⁇ m and 10 ⁇ m.
• the layer formed during the non-stick coating has a thickness of between 0.5 ⁇ m and 5 ⁇ m. Very preferably, this thickness is between 1 ⁇ m and 3 ⁇ m.
• the exposed surfaces of the composite layer are substantially planar.
• the deposition of the anti-slip layer by printing methods of the screen printing, heliography, flexography, inkjet, fiberization, nozzle system or any other method allowing significant deposits makes it possible to obtain reliefs, formed of thick parts and thin parts, uniform and repetitive. These methods make it possible to obtain exposed surfaces of the mixed layer that are substantially flat.
• the anti-slip coating is carried out with a silicone-based composition which crosslinks under the effect of humidity or of a crosslinking agent and/or of a catalyst.
• the anti-slip coating is made with a silicone-based composition comprising expandable microspheres.
• said composition is chosen so as to be able to crosslink under exposure to ultraviolet radiation.
• the anti-slip coating is made with a composition based on polyurethane.
• the anti-slip coating is carried out with a composition comprising an anionic aqueous dispersion of polyurethane.
• said composition is chosen so as to be able to crosslink by a thermal drying mode.
• the release coating is made with a silicone-based composition in aqueous emulsion which crosslinks under the effect of a crosslinking agent and/or a catalyst.
• the release coating is made with a solvent-free silicone-based composition which crosslinks under the effect of a crosslinking agent and/or a catalyst and/or by exposure to ultraviolet radiation.
• the release coating is made with a composition comprising an aqueous dispersion of a polyethylene wax modified with a polytetrafluoroethylene (PTFE).
• PTFE polytetrafluoroethylene
• said composition crosslinks by drying or thermal heating.
• the layer formed during the anti-slip coating covers an area of between 5% and 80% of the area of the front face and has a minimum thickness of 4 ⁇ m.
• the mass of the anti-slip composition deposit per unit area of the front face expressed in grams per square meter (g/m 2 ), varied.
• the mass of deposit of anti-slip composition per unit area is between 5 g/m 2 and 30 g/m 2 .
• the mass of the anti-slip composition deposit per unit area of the front face is between 10 g/m 2 and 25 g/m 2 .
• the mass of the anti-slip composition deposit per unit area of the front face is between 12 g/m 2 and 20 g/m 2 .
• the invention relates to a method for manufacturing an adhesive strip, provided with a support comprising a first face called the "front face”, and a second face called the “rear face” covered at least in part with an adhesive layer, said method comprising:
• the steps of depositing a first coating and depositing a second coating are carried out by means of printing methods chosen from among screen printing, heliography and flexography.
• the steps of depositing a first coating and a second coating are carried out by means of other printing or coating methods known to those skilled in the art, for example by coating by rollers, by air blades, by trailing blade, or by nozzles.
• the step of depositing a first coating is carried out by screen printing and the step of depositing a second coating is carried out by heliography.
• the first coating step and the second coating step are carried out by means of two printing groups identified between them so that a first printing group deposits a coating and a second printing group deposits the other coating only in the areas not covered by the first printing group.
• the method comprises a step of treatment of the layer formed by Tenduction carried out as a first chosen from among a corona surface treatment, a plasma surface treatment, or an electrowetting.
• the adhesion between a coating and the front face or between the first and the second coating is increased, facilitating its deposition.
• the method includes a step of crosslinking the layer having anti-slip properties or the layer having anti-adhesive properties.
• FIG. 1 represents, schematically and in longitudinal section view, a first particular embodiment of an adhesive tape which is the subject of the present invention
• FIG. 2 represents, schematically and in longitudinal section view, a second particular embodiment of an adhesive tape which is the subject of the present invention
• FIG. 3 represents, schematically and in longitudinal section view, a third particular embodiment of an adhesive tape which is the subject of the present invention
• FIG. 4 represents, schematically and in the form of a flowchart, a particular succession of steps in the method of manufacturing an adhesive tape which is the subject of the present invention
• FIG. 5 represents, schematically, a device for manufacturing an adhesive tape obj and of the present invention
• FIG. 6 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a first pattern formed by the alternation of thick zones and thin zones,
• FIG. 7 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a second pattern formed by the alternation of thick zones and thin zones,
• FIG. 8 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a third pattern formed by the alternation of thick zones and thin zones and
• FIG. 9 represents, schematically, in top view a particular embodiment of the adhesive tape which is the subject of the invention, which has a fourth pattern formed by the alternation of thick zones and thin zones.
• Adhesive strips according to the invention Adhesive strips according to the invention; 105 Stand; 106 Front side of 105; 107 Rear face of 105; 110 Adhesive layer; 120 or 140 Layer resulting from the coating non-stick; 130 Layer resulting from the anti-slip coating; 131 Thick parts of the mixed layer; 132 Fine parts of the mixed layer; 30 Device for the manufacture of an adhesive tape according to the invention; 305 Unwinder; 306 Media Roll 105; 315 and 330 First and second printing group; 317, 332 and 341 Dryers; 320 and 335 Cross-linking devices; 325 Corona treatment unit; 340 Adhesive layer coating group; 345 Winder; 346 Roll of adhesive tape according to the invention.
• FIGS. 1, 2 and 3 A schematic view of different embodiments of an adhesive tape 12, 14 and 16 objects of the present invention is observed in FIGS. 1, 2 and 3.
• the adhesive tape 12, 14 or 16 comprises a support 105 intended to receive coatings to make it a functional tape.
• support 105 a thin paper with high tensile strength, transparent or opaque.
• the support may in particular be chosen from the family of offsets, krafts, coated or uncoated, rubbed or unrubbed, unglued recycled materials, glued on one side or on both sides.
• the basis weight of the support will preferably be chosen between 25 g/m 2 and 220 g/m 2 , preferably between 40 g/m 2 and 90 g/m 2 , for example 60 g/m 2 .
• the support may include a reinforcing grid made of cellulose fibers or textile fibers, for example cotton fibers.
• the support can be chosen from reinforced, reinforced papers.
• the support 105 may also be a plastic film, such as for example a poly(ethylene) (abbreviated PE), a poly(propylene) (abbreviated PP), a polylactic acid (abbreviated PLA), a poly(vinyl chloride) (abbreviated PVC), a copolymer of PE and PP, a poly(terephthalate ethylene) (abbreviated PET), or even a biopolymer film.
• a support may, depending on requirements, be transparent or opaque, with a thickness of between 5 ⁇ m and 200 ⁇ m, preferably between 10 ⁇ m and 80 ⁇ m, for example 30 ⁇ m.
• the support 105 may also be chosen from non-woven fabrics, textiles, cardboard, and any other flexible support well known to those skilled in the art.
• the support 105 is a rollable strip, very long compared to its width and thin compared to its width, so that the support 105 has two main faces with non-negligible areas.
• One face of the support is arbitrarily called “front face” 106, the other face is called “rear face” 107.
• the rear face 107 of the support 105 is coated with an adhesive layer 110.
• the adhesive layer 110 may include any adhesive well known to those skilled in the art suitable for implementation on a support as described above.
• the adhesive layer comprises a pressure-sensitive adhesive (abbreviated PSA, standing for “Pressure-Sensitive Adhesive”) or a self-adhesive.
• PSA pressure-sensitive adhesive
• the adhesive is chosen to have an immediate tack and an adhesive power on paper and cardboard such that it causes the destruction of this paper or cardboard on opening when it is torn from the surface of the paper or cardboard.
• a hot-melt or aqueous adhesive of the synthetic rubber or acrylic type, is used.
• the product Technomelt® PS 5020 N marketed by Henkel and the reference TLH 4280 E from Bostik can be used.
• the adhesive strips 12, 14 and 16 according to the invention are remarkable in that the front face 106 of the support 105 comprises a mixed layer with anti-slip and non-stick properties, hereinafter called “mixed layer”.
• the mixed layer of adhesive strips 12, 14 and 16 has the particularity of having thick parts 131 and thin parts 132 with respect to a cutting plane perpendicular to the plane formed by the front face 106, illustrated in Figures 1, 2 and 3.
• the thickness of the mixed layer varies between a low thickness and a high thickness, these thicknesses preferably being substantially uniform over the entire layer of the first coating 130.
• the thin parts 132 are thinner than the thick parts 131.
• the thin parts 132 have a thickness of between 1 and 10 ⁇ m and the thick parts 131 have a thickness greater than 1 ⁇ m, preferably greater than 20 ⁇ m, very preferably greater than 25 ⁇ m.
• the mixed layer comprises a first coating 130 with anti-slip properties forming the thick parts.
• the mixed layer also includes a second coating, 120 or 140, forming the thin parts positioned between two successive thick parts.
• the first coating 130 is advantageously a coating comprising a silicone composition.
• Single-component compositions may consist of a silicone which crosslinks under the influence of humidity, preferably at room temperature.
• Such products exist commercially, for example the product sold under the trade name ELASTOSILTM 50 by the company Wacker.
• Multi-component compositions can for example comprise a base silicone polymer (typically a polydimethylsiloxane with functional and auxiliary groups), a crosslinking agent (which can be a polydimethylsiloxane with hydrogenated groups) and a catalyst, which can be a compound of platinum dissolved in a polydimethylsiloxane.
• the anti-slip coating is made with a silicone-based composition comprising expandable microspheres.
• the composition comprises the product SilForceTM SM3300 by the company Momentive and also comprises non-expanded microspheres in aqueous dispersion, for example the product ExpancelTM 820 SLU 40 marketed by the company Akzo Nobel.
• the anti-slip coating 130 is produced with a composition based on polyurethane, for example the product sold under the name ESACOTE SW3TM by the company Lamberti.
• the second coating, 120 or 140 has non-stick properties.
• the adhesion force of the second coating, 120 or 140, with the adhesive layer 110 is less than the adhesion force between the adhesive layer 110 and the first coating 130.
• the second coating, 120 or 140, called non-stick coating is advantageously a coating comprising a silicone composition; it may be a multi-component composition based on an aqueous emulsion of a polydimethylsiloxane bearing vinyl groups.
• This composition may also comprise a catalyst (for example an aqueous emulsion of a platinum compound dissolved in a polydimethylsiloxane bearing vinyl groups) and a crosslinking agent (for example an aqueous emulsion of a methylhydrogenpolysiloxane).
• the non-stick coating, 120 or 140 is produced with a composition comprising the product sold under the name DEHESIVETM EM 490, by the company Wacker.
• the non-stick coating, 120 or 140 is made with a composition comprising the product TEGO® RC 1403, from the company EVONIK GMBH.
• the non-stick coating, 120 or 140 is produced with a composition comprising an aqueous dispersion of a polyethylene wax modified with a polytetrafluoroethylene, for example the product sold under the name DEUTERON OG 330TM by the company DEUTERON GMBH.
• the mixed layer is preferably configured to have a coefficient of static friction greater than or equal to 0.5, preferably greater than or equal to 1. Evaluation of the anti-adhesive properties
• Tests have been carried out by the applicant to compare the delamination force of a few commercially available roll adhesive strips and to compare it to the delamination force between the mixed layer according to the invention and a standard PSA adhesive which corresponds to the test 3, below.
• Tests 1 and 2 are commercially available tape delamination tests performed for comparison.
• the non-stick properties are evaluated according to the FTM 3 method proposed by the European self-adhesive label industry association (FINAT), already presented above.
• the width of the strips used as a sample during these tests is fixed at 25 millimeters.
• the resistance values (to delamination) measured during these tests, i.e. the adhesion values, are collated in table 1 below.
• Test 1 is a delamination test of a 25 ⁇ m HT AC 518N PP acrylic adhesive tape, supplied by Ocopa Emballages®.
• This strip comprises a support of BOPP (abbreviated from English “Biaxally oriented PolyPropylene”) coated with an acrylic adhesive.
• BOPP abbreviated from English “Biaxally oriented PolyPropylene”
• the resistance measured corresponds to the resistance to delamination between the BOPP support and an acrylic adhesive coated on a BOPP support.
• Test 2 is a delamination test of a Tesa® 4313 PVO adhesive tape.
• This adhesive tape has a paper backing and a solvent-free adhesive. The resistance measured therefore corresponds to the resistance to delamination between the paper and a solvent-free adhesive coated on a paper support.
• Test 3 is a delamination test of an adhesive tape according to the invention.
• the adhesive tape tested during test 3 has a kraft backing, the back side of which is coated with a TLH 4280 E adhesive marketed by Bostik.
• TLH 4280 E is a hot melt pressure sensitive adhesive (PSA).
• PSA hot melt pressure sensitive adhesive
• the front face of said support is coated with a mixed layer according to the invention.
• Test 3 which aims to simulate the unwinding of an adhesive tape according to the invention, measures the resistance to delamination between the TLH 4280 adhesive coated on the kraft support and a mixed layer according to the invention coated on a kraft support.
• the mixed layer tested exhibits weak adhesion with the adhesive layer, measured at 10 gf/cm of resistance to separation, allowing easy unwinding of the adhesive tape according to the invention.
• the resistance to separation is less than or equal to 250 gram-force per centimeter (gf/cm).
• a total flat area of non-stick coating 120 has been applied to the front face 106 of the support 105.
• total flat area is meant the deposition of a coating layer of constant thickness, deposited over the entire surface of the front face 106.
• Over the non-stick coating patch 120 has been discontinuously deposited an anti-slip coating 130.
• Anti-slip coating mounds 130 of constant thickness have been deposited at regular intervals on the exposed surface of the coating patch. anti-adhesive 120.
• Printing methods of the screen printing, heliography and flexography type make it possible to obtain a repeated pattern on the first coating layer 130 having thick parts regularly spaced between them.
• the first coating 130 and the second coating 120 are one and the same composition which have both anti-slip and anti-adhesive properties.
• the thick parts of the mixed layer of the adhesive tape illustrated in FIG. 1 are formed of a thin layer of second coating 120 surmounted by a thick deposit of coating 130 while the thin parts are formed of a thin layer of the second coating 120.
• mounds of anti-slip coating 130 of constant thickness have been deposited at regular intervals on the front face 106 of the support 105.
• a second deposit of non-stick coating 140 was made on top, depositing a thin layer of second coating 140 on the anti-slip coating 130 and on the still exposed parts of the face 106.
• the thick parts of the mixed layer are formed of a thin layer of second coating 140 surmounting a thick deposit of coating 130 and the thin parts are formed of a thin layer of second coating 140.
• the deposition of the non-stick coating 120 and of the anti-slip coating 130 have been carried out successively. So that areas of the front face 106 are covered by thick deposits of non-slip coating 130 and the remaining areas are covered with a thin deposit of non-stick coating 120.
• the steps of depositing G anti-slip coating and G non-stick coating are carried out by means of two printing groups marked between them so that a first printing group deposits a coating and that a second printing group deposits the other coating only in the areas not covered by the first printing group.
• the thick parts of the mixed layer are formed by a thick deposit of coating 130 in contact with the front face 106 and the thin parts of the mixed layer are formed by a thin second coating layer 140 in contact with the front face 106.
• the alternation of thick parts and thin parts of the mixed layer preferably forms a pattern, that is to say a design formed by the alternation of thick parts and thin parts, repeated at regular intervals on the mixed layer.
• This pattern can be a geometric shape, for example bands parallel to each other, chevrons, wavy lines, or even a checkerboard.
• This pattern can also represent a logo or form letters or a sentence.
• the pattern is chosen from those illustrated in FIGS. 6, 7, 8 and 9, in which the thick parts are shown in black color and the thin parts are shown in white color. Note that the patterns illustrated in Figures 6 and 7 are of the same type but the scale of the geometric shape forming the pattern is reduced on the pattern illustrated in Figure 7, so that the coverage rate is lower.
• the applicant has carried out tests to evaluate the anti-slip properties of a tape comprising a paper support covered with a coating with anti-slip properties made with a silicone-based composition which crosslinks under the effect of a catalyst.
• the coefficient of friction is determined by the method of the horizontal plane for the determination of the coefficients of static and kinetic friction according to standard NF ISO 15359: 1999, already described above.
• the thickness of the anti-slip layer is expressed in pm and the coverage rate (also called inking rate) of the paper support by the anti-slip coating is expressed as a percentage.
• checkerboard pattern is shown in Figure 8
• chevron pattern 16 is shown in Figure 7
• chevron pattern 32 is shown in Figure 6.
• a thicker anti-slip layer makes it possible to obtain a greater coefficient of kinetic friction, as illustrated by the tests carried out with the chevron patterns 16 of 9.8 ⁇ m and 13.2 ⁇ m thick which have a coefficient of friction of 0 .6 and 0.9, respectively.
• the chevron pattern 30, with a greater coverage rate and greater layer thickness further increases the coefficient of kinetic friction.
• the value P obtained by multiplying the degree of coverage by the thickness is between 2 and 30. More preferentially it is between 2 and 20, very preferentially between 2 and 5.
• the mass of the anti-slip composition deposit per unit area of the front face (expressed in grams per square meter) varies.
• the anti-slip properties as a function of the anti-slip composition deposit mass were evaluated on various samples, by determining the static and kinetic friction coefficients.
• the coefficient of friction is determined by the horizontal plane method for the determination of the static and kinetic friction coefficients according to standard NF ISO 15359: 1999, already described above.
• the applicant has determined that a mass deposit of anti-slip composition of between 5 g/m 2 and 30 g/m 2 offers good anti-slip performance while allowing a saving in the quantity of composition used during the anti-slip coating.
• the values of static and kinetic friction coefficients measured on the samples obtained are of the order of 0.8 or less for deposits of anti-slip composition with a mass of less than 5 g/m 2 .
• a deposit of anti-slip composition with a mass greater than 5 g/m 2 is preferable.
• the values of static and kinetic friction coefficients measured on the samples obtained are of the order of 1.2 or higher for deposits of anti-slip composition with a mass of 25 g. /m 2 approx. It is found that by increasing the mass of the deposit of anti-slip composition beyond 25 g/m 2 the gains in terms of increasing the values of static and kinetic friction coefficients are minimal. In order to save on the amount of composition used during G anti-slip coating, it has therefore been determined that a deposit of anti-slip composition with a mass of less than 30 g/m 2 is preferable.
• an anti-slip composition deposit mass of between 10 g/m 2 and 25 g/m 2 or even between 12 g/m 2 and 20 g/m 2 is even more advantageous because such a deposit makes it possible to obtain static and dynamic coefficients of between 1 and 1.2 while saving on the amount of composition used during the anti-slip coating.
• FIG. 4 shows a succession of specific steps in the method of manufacturing an adhesive tape which is the subject of the present invention. This method makes it possible in particular to produce an adhesive strip 12, 14 or 16 as described previously with regard to FIGS. 1 to 3. ".
• FIG. 5 shows a device 30 allowing the manufacture of an adhesive tape by the method described in FIG. 4.
• the main purpose of said method and device 30 is to cover at least part of the front face of an adhesive strip 12, 14 or 16 with a mixed layer with anti-slip and anti-adhesive properties.
• the method uses a first so-called anti-slip coating and a second so-called non-stick coating. These coatings already described above are not described again here.
• the method includes a step 1005 of supplying a support, of the type of support 105, described previously.
• the support 105 is typically supplied in the form of a roll 306 unrolled by an unwinder 305, under low mechanical tension with a view to its coating during the various stages of the process.
• the non-stick coating is deposited in the form of a total solid on the front face of the support.
• this step 1015 is carried out by a first printing unit 315 configured to implement a screen printing, heliography or flexography method. This step is preferably carried out by a heliographic method.
• the pattern to be printed is engraved on a cylinder.
• the ink is deposited in the cells of the engraved cylinder, then the support to be printed is pressed between the engraved cylinder and an impression cylinder.
• this step 1015 is carried out by a method of the ink jet type, fiberization, by a nozzle system or any other method allowing significant deposits.
• the method includes a step 1020 of crosslinking.
• the crosslinking step 1020 is preferably carried out thermally, for example by hot air, or by infrared radiation, in a crosslinking device 320.
• crosslinking can also be envisaged. photochemical by ultraviolet irradiation, or any other crosslinking technique.
• this step is preceded by a drying step using a dryer 317.
• the method comprises a step 1025 of corona surface treatment on the non-stick coating patch deposited during the previous steps, with a view to facilitate the adhesion of the second coating with the first coating which will be deposited during the next step.
• the corona treatment step is performed in a corona treatment unit 325 provided with an electrode.
• This corona treatment is known as such to those skilled in the art and will not be explained here in greater detail. Any other surface treatment process having the effect of increasing the wettability of the surface, such as plasma surface treatment or electrowetting, can also be implemented.
• the coating with anti-slip properties is deposited on the front face of the support so as to create thick parts of the mixed layer.
• This step is carried out by a second printing unit 330.
• these thick parts are regularly spaced between them.
• the second printing group implements a method of screen printing, heliography or flexography.
• the printing method used is a screen printing method.
• the pattern to be deposited here formed of thick parts spaced apart from each other, is represented in negative on a finely perforated screen arranged around a first cylinder.
• a mobile squeegee spreads the coating on a sieve and forces it to pass through the perforations not blocked by the screen to be deposited on the support.
• this step 1030 is followed by a second drying step through a dryer 332.
• the method comprises a crosslinking step 1035 similar to the crosslinking step 1020 already described above. This second crosslinking step is carried out in a second crosslinking device 335.
• a layer of adhesive is deposited on the rear face of the support according to in-line coating methods well known to those skilled in the art, which are not described in detail here.
• Said step 1040 is carried out by means of a coating unit 340.
• the adhesive tape may be circulated in a direction 352 leading to a circuit comprising a dryer 341 or circulated in a direction 351 leading directly to a winder 346, without prior drying.
• the method may include a step of cutting the roll 345 obtained into a plurality of rolls of larger size small and therefore easier to handle. This cutting can be done in a known manner during G winding, by slitting to obtain several rolls of smaller width, and/or by cutting to obtain several shorter rolls.
• the method may include, instead of step 1045, a format cutting step, that is to say cutting the adhesive strip into pieces of predetermined size.
• steps described above for the process according to the invention can be carried out continuously on the same production line or discontinuously, by step or by group of steps, on separate production lines.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Adhesive Tapes (AREA)

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• 2021
  • 2021-07-07 FR FR2107338A patent/FR3124956B1/fr active Active
• 2022
  • 2022-07-07 CA CA3225005A patent/CA3225005A1/fr active Pending
  • 2022-07-07 US US18/577,251 patent/US20240352283A1/en active Pending
  • 2022-07-07 EP EP22748432.6A patent/EP4367190A1/de active Pending
  • 2022-07-07 WO PCT/IB2022/056269 patent/WO2023281427A1/fr not_active Ceased

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