WO2011110482A1 - Utilisation d'une composition adhésive activable pour la production de découpes à plat de boîtes pliantes - Google Patents

Utilisation d'une composition adhésive activable pour la production de découpes à plat de boîtes pliantes Download PDF

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Publication number
WO2011110482A1
WO2011110482A1 PCT/EP2011/053265 EP2011053265W WO2011110482A1 WO 2011110482 A1 WO2011110482 A1 WO 2011110482A1 EP 2011053265 W EP2011053265 W EP 2011053265W WO 2011110482 A1 WO2011110482 A1 WO 2011110482A1
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WIPO (PCT)
Prior art keywords
monomer
adhesive composition
weight
less
equal
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PCT/EP2011/053265
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German (de)
English (en)
Inventor
Dieter Urban
Karl-Heinz Schumacher
Stefan Kirsch
Uta Holzenkamp
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Basf Se
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Publication of WO2011110482A1 publication Critical patent/WO2011110482A1/fr

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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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies
    • B31B50/46—Folding sheets, blanks or webs by plungers moving through folding dies and interconnecting side walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • 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
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/28—Presence of paper
    • C09J2400/283—Presence of paper in the substrate

Definitions

  • the invention relates to the use of an activatable adhesive composition containing certain (meth) acrylate or vinylaromatic copolymers containing acid or hydroxy groups for the production of folding carton blanks, which are blockable at 25 ° C. with the adhesive composition applied thereto and the energy-activated production of folding cartons from corresponding folding carton blanks ,
  • Folding carton blanks are industrially prefabricated blanks that are supplied to the processing companies in a space-saving, folded-together state, where they are erected, filled and sealed into boxes. In many cases, the upright, each opposing parts are connected to each other by gluing and / or the boxes are sealed after filling by gluing.
  • carton blanks to be bonded are unsealed, i. supplied without adhesive to the processing company, e.g. in the form of box type E according to the classification system of the European Carton Makers Association. The blanks are then provided with a hot melt adhesive immediately prior to introduction into the erecting device and glued after erection.
  • a process for the production of folding boxes is described, wherein on blanks an unspecified described dispersion coating is applied and a bonding is effected by the action of ultrasound.
  • a reactivatable adhesive is described, which is reactivated by the action of a radiation energy having a wavelength of 400 nm to 100,000 nm.
  • the radiation energy is generated in particular by NIR radiation, for example a halogen tungsten lamp, and the adhesive contains an NIR-absorbing ingredient.
  • NIR radiation for example a halogen tungsten lamp
  • the unspecific, non-directional use of relatively high-energy NIR radiation can lead to an undesirable, large-scale heating of non-sticking packaging parts or the ingredients to be packaged, which increases the possibilities of filling the packages with heat or radiation sensitive.
  • lent ingredients already before or immediately after irradiation impaired and also consumes more energy than is required for the actual bonding.
  • the technology should additionally allow the gluing or gluing closing of cartons already filled with heat- or radiation-sensitive ingredients or to be filled immediately after the gluing.
  • the invention relates to the use of an activatable adhesive composition for the production of folding box blanks.
  • the carton blanks have surface areas to which the activatable adhesive composition is applied and are block resistant at 25 ° C.
  • the adhesive composition has an IgG 'value of greater than or equal to 6.0 at or equal to 25 ° C and at greater than or equal to 120 ° C an IgG' value of less than or equal to 4.0, containing at least one copolymer with a glass transition temperature of greater than 30 ° C, wherein the copolymer of at least a first monomer and more than 3 wt.% And less than 40 wt.%, Based on the total amount of monomers, at least one other of the first monomer second Monomer is formed, wherein the first monomer is selected from the group consisting of alkyl acrylates, alkyl methacrylates and vinyl aromatics and the second monomer is selected from the group consisting of ethylenically unsaturated monomers having acid groups, hydroxyalkyl
  • the invention also provides the folding carton blanks produced according to the invention, the use of folded carton blanks for the energy-activated production of folding cartons and folding cartons produced according to this use.
  • the invention also provides a process for the production of folding cartons, wherein
  • Adhesive composition is applied,
  • the adhesive composition is activated by the action of energy, thereby causing gluing of the folded box, wherein the adhesive composition
  • the first monomer is selected from the group consisting of alkyl acrylates, alkyl methacrylates and vinyl aromatics and the second Monomer is selected from the group consisting of ethylenically unsaturated monomers with acid groups, hydroxyalkyl acrylates and hydroxyalkyl methacrylates.
  • activatable adhesive composition means that the adhesive composition or folding box with adhesive composition applied thereto at room temperature (25 ° C) and without energetic action (eg electromagnetic radiation) are not or only slightly adhesive that the Faltschachtelzuitese that in the As a rule, they are made of cardboard, they are block-resistant, and the adhesive composition becomes adhesive upon energetic action.
  • the term adhesive composition includes the adhesive agents and optional additives and solvents.
  • Block-proof within the meaning of the application means that when lifting a single blank from a stack of several blanks no further blank adheres. In the stack, a pressure of up to 2 g / mm 2 can occur.
  • Electromagnetic radiation can be, for example, IR radiation having a wavelength of 0.4 to 1000 ⁇ , NIR radiation of a wavelength of 0.4 to 100 ⁇ , microwave radiation of a wavelength of 1 mm to 1 m or radio waves of a wavelength of 1 m to 10 km.
  • the adhesive composition has a temperature-dependent tack profile. At room temperature (25 ° C) the composition is not or only slightly adhesive. At temperatures above room temperature, the composition is adhesive. Unless otherwise stated, physical parameters and properties refer to ratios at room temperature (25 ° C) and for the range of conventional relative humidity (30-90%).
  • the adhesive composition has an Ig G 'greater than or equal to 6.0, preferably from 6.0 to 8.0, and at temperatures greater than or equal to 120 ° C, an Ig G' smaller or equal to 4.0, preferably from 2.5 to 3.9, measured by means of a deformation-controlled rheometer with parallel-plate geometry (diameter 8 mm, sample thickness 0.9-1, 2 mm) or torsion -Rectangular geometry (sample width 6 mm, sample length 21 mm, sample thickness 0.9-1, 2 mm).
  • the dynamic shear modulus G ' is measured at a measurement frequency of 1 Hz with the torsion-rectangular geometry at 25 ° C and with the parallel-plate geometry at 120 ° C. From the adhesives are cast for the measurements films, which are dried to constant weight.
  • the IgG 'values of the invention can be adjusted by the monomer composition of the adhesive polymers or by addition of plasticizer. If the adhesive composition does not already have the Ig G 'values owing to the monomer composition of the polymers, the Ig G' values can be adjusted according to the invention by addition of the plasticizers described in more detail below
  • the adhesive composition may be a fusible solid composition, a polymer solution or a polymer dispersion (before application to the blanks and optionally drying). Preference is given to aqueous polymer solutions and aqueous polymer dispersions. Preferably, at least one polymer is contained, which has a glass transition temperature Tg of greater than 30 ° C, preferably greater than 35 ° C or greater than 40 ° C. The glass transition temperature can be determined by conventional methods such as differential scanning calorimetry (see, e.g.
  • the dispersion preferably contains solids contents of from 15 to 75% by weight, preferably from 40 to 75% by weight.
  • the adhesive composition contains at least 40 weight percent dispersed polymer.
  • copolymers are understood as meaning polymers of two or more different monomers.
  • (meth) acrylate and similar terms are used as a shorthand notation for "acrylate or methacrylate”.
  • the copolymers used in the adhesive composition can be obtained by radical polymerization of ethylenically unsaturated compounds.
  • the copolymers preferably comprise at least 10% by weight or at least 20% by weight, or at least 40% by weight, more preferably at least 60% by weight, of the first monomers, which are preferably selected from C 1 to C 2 0 alkyl (meth) acrylates and vinyl aromatics having up to 20 carbon atoms.
  • the alkyl (meth) acrylate monomers are preferably selected from C 1 -C 20 -alkyl (meth) acrylates, in particular C 1 to C 10 -alkyl acrylates and C 1 to C 10 -alkyl methacrylates, or C 1 to C 8 -alkyl (meth) acrylates.
  • Suitable monomers are, for example, methyl methacrylate, methyl acrylate, n-butyl acrylate, ethyl acrylate, n-hexyl acrylate, octyl acrylate and 2-ethylhexyl acrylate.
  • mixtures of (meth) acrylic acid alkyl esters are also suitable.
  • Suitable vinylaromatics are vinyltoluene, ⁇ - and p-methylstyrene, ⁇ -butylstyrene, 4-n-butylstyrene, 4-n-decylstyrene and preferably styrene.
  • the copolymers according to the invention contain styrene in amounts of from 10 to 60% by weight, preferably 20-50% by weight.
  • the polymer to be used according to the invention is moreover composed of more than 3% by weight and up to 40% by weight, based on the total amount of monomers, of monomers which are selected from ethylenically unsaturated monomers having acid groups, hydroxyalkyl acrylates and hydroxyalkyl methacrylates.
  • Monomers having acid groups are, in particular, ethylenically unsaturated compounds which have at least one carboxylic acid, sulfonic acid or phosphonic acid group.
  • carboxylic acid groups examples which may be mentioned are acrylic acid, methacrylic acid, itaconic acid, maleic acid or fumaric acid.
  • the acid groups may be in the form of their salts.
  • Preferred hydroxyalkyl (meth) acrylates are the C 2 to C 12 hydroxyalkyl (meth) acrylates and in particular the C 2 to C 6 or the C 2 to C 4 hydroxyalkyl (meth) acrylates. Very particular preference is given to hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate or hydroxybutyl methacrylate.
  • the content of acid or hydroxy monomers in the copolymer can be, for example, 4 to 15% by weight in the case of aqueous dispersions, or in the case of aqueous solutions of up to 40% by weight, for example 24 to 40% by weight, based on the polymer be.
  • the polymer may contain other monomers, e.g. Vinyl esters of carboxylic acids containing up to 20 carbon atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols containing 1 to 10 carbon atoms, aliphatic hydrocarbons having 2 to 8 carbon atoms and one or two double bonds or mixtures of these monomers.
  • Vinyl esters of carboxylic acids having 1 to 20 carbon atoms are e.g. Vinyl laurate, vinyl stearate, vinyl propionate, vinyl versatate and vinyl acetate.
  • nitriles are acrylonitrile and methacrylonitrile.
  • the vinyl halides are ethylenically unsaturated compounds substituted with chlorine, fluorine or bromine, preferably vinyl chloride and vinylidene chloride.
  • vinyl ethers there are e.g. Vinyl methyl ether or vinyl isobutyl ether.
  • Suitable hydrocarbons having 4 to 8 C atoms and two olefinic double bonds are e.g. Butadiene, isoprene and chloroprene.
  • Hydrocarbons having 2 to 4 carbon atoms are e.g. Ethylene, propylene or butene.
  • Further monomers are, for example, also (meth) acrylamides, phenyloxyethylglycol mono- (meth) acrylate, glycidyl (meth) acrylate, aminoalkyl (meth) acrylates, such as, for example, 2-aminoethyl (Meth) acrylate.
  • Alkyl groups preferably have from 1 to 20 carbon atoms.
  • Other monomers which may also be mentioned are crosslinking monomers. The other monomers are generally used in minor amounts, their proportion is generally less than 10 wt.%, In particular less than 5 wt.%.
  • the ratio of the monomers to each other is preferably adjusted so that the glass transition temperature of the polymer is greater than 30 ° C, or greater than 35 ° C or greater than 40 ° C.
  • the preparation of the radically polymerized polymers can be carried out by emulsion polymerization known per se. In the emulsion polymerization, ionic and / or nonionic emulsifiers and / or protective colloids or stabilizers are used as surface-active substances and also suitable initiators and optionally molecular weight regulators. The emulsion polymerization is generally carried out at 30 to 130 ° C, preferably at 50 to 90 ° C.
  • the polymerization medium may consist of water only, as well as of mixtures of water and thus miscible liquids such as methanol. Preferably, only water is used.
  • a polymer seed can be provided.
  • aqueous dispersions of the polymer are generally obtained with solids contents of 15 to 75 wt .-%, preferably from 40 to 75 wt .-%. Dispersions with the highest possible solids content are preferred.
  • the dispersion or adhesive composition contains at least 60% by weight of dispersed polymer.
  • the viscosity is too high and the dispersion is no longer manageable.
  • the generation of a new generation of particles can be carried out, for example, by adding seed, by adding excess emulsifier amounts or by adding miniemulsions.
  • the generation of one or more new particle generations can take place at any time. It depends on the particle size distribution desired for a low viscosity.
  • the polymer thus prepared is used in the form of its aqueous dispersion.
  • the size distribution of the dispersion particles may be monomodal, bimodal or multimodal.
  • the average particle size of the polymer particles dispersed in the aqueous dispersion is preferably less than 400 nm, in particular less than 200 nm. More preferably, the average particle size is between 140 and
  • the particle size distribution can be determined in a known manner with the analytical ultracentrifuge (W. Gonzchtie, Makromolekulare Chemie 185 (1984), page 1025-1039). For bi- or multimodal particle size distribution, the particle size can be up to 1000 nm.
  • the pH The value of the polymer dispersion is preferably adjusted to pH greater than 4.5, in particular to a pH of between 5 and 8.
  • the adhesive composition preferably contains at least one electromagnetic radiation, in particular microwave radiation absorbing material.
  • This substance is preferably non-adhesive or tacky by itself and is preferably contained in an amount of from 2 to 30, especially from 5 to 15,% by weight, based on the total composition.
  • Electromagnetic radiation or microwave radiation absorbing in the context of the invention is a substance when it absorbs energy when irradiated with electromagnetic waves, thereby heating and emits the absorbed energy as heat to the environment.
  • the electromagnetic radiation absorbing material is e.g. selected from the group consisting of carbon black, graphite, organic color pigments and mixtures thereof.
  • the adhesive composition preferably contains at least one plasticizer.
  • the plasticizers are preferably contained in an amount of from 5 to 50, in particular from 5 to 35,% by weight, based on the total composition.
  • plasticizers are phthalic acid esters, trimellitic acid esters, acyclic dicarboxylic acid esters, polymeric plasticizers, phosphoric acid esters, fatty acid esters, hydroxycarboxylic esters, epoxy plasticizers, polyamide plasticizers and polyalkylene glycols.
  • Phthalic acid esters and trimellitic acid esters are, for example, the esters of phthalic acid, isophthalic acid or mellitic acid with C 1 -C 10 -alkanols, for example di-n-octyl phthalate, di-n-nonyl phthalate, di-n-decyl phthalate, diisodecyl phthalate, di-n-octyl isophthalate, Di-n-nonyl isophthalate, diisononyl phthalate, di-n-decyl isophthalate, di (2-ethylhexyl) phthalate, di-n-butyl phthalate, diisobutyl phthalate, dicyclohexyl phthalate, dimethyl phthalate, diethyl phthalate, tris (2-ethylhexyl) tri- laurate.
  • C 1 -C 10 -alkanols for example di-n
  • Acyclic dicarboxylic acid esters are for example the diesters of dicarboxylic acids with alkanols, especially the diesters of C 4 to C 0 dicarboxylic acids with C1 to Ci 0 - alkanols, for example the diesters of adipic acid, decanedioic acid, glutaric acid,
  • Succinic acid for example dimethyl adipate, diethyl adipate, di-butyl adipate, di-isobutyl adipate, glutaric acid di-ethyl glutarate, di-n-butyl glutarate, diisobutyl glutarate, dimethyl succinate, succinic acid succinate, di-succinic di-suberate, diisobutyl succinate and mixtures of the above-mentioned compounds
  • Polymeric plasticizers are, for example, the polyesters of dicarboxylic acids and alkanediols, in particular C 4 to C 1 0 dicarboxylic acids and C 2 to C 1 0 diols with molecular weights M r of from 1800 to 13 000, for example polyesters of adipic acid, decanedioic acid, azelaic acid or phthalic acid with diols, such as butane-1 , 3-diol, propane-1, 2-d
  • Phosphorus esters are, for example, phosphoric acid compounds which are at least monosubstituted by alkanol, for example C 1 -C 10 -alkyl-di-C 6 -C 4 -aryl phosphates.
  • Examples are isodecyldiphenyl phosphate, tricresyl phosphate, triphenyl phosphate, diphenylketone sylphosphate, diphenylacetylphosphate, tris (2-ethylhexyl) phosphate, tris (2-butoxyethyl phosphate, hydroxycarboxylic acid esters are, for example, citric acid esters such as tributyl O-acetyl citrate and corresponding tartaric and lactic acid esters.
  • plasticizers are polyalkylene glycols, especially polyethylene glycol, polypropylene glycol, polyethylene glycol-polypropylene glycol copolymers, in particular the block copolymers, and polypropylene glycols etherified with two different alcohols.
  • Suitable polyalkylene glycols are especially those with egg nem molecular weight of 100 to 2000.
  • Suitable plasticizers are polyethylene glycols, which are commercially available under the brand name Puriol ® E.
  • at least one polyethylene glycol is present, in particular having a molecular weight of from 100 to 2000.
  • the polyethylene glycols are preferably present in an amount of from 5 to 35, in particular from 10 to 30,% by weight, based on the total composition.
  • the adhesive composition may contain a tackifier (tackifying resins).
  • Tackifiers are for example from Adhesive Age, July 1987, page 19-23 or Polym. Mater. Be. Closely. 61 (1989), pages 588-592.
  • Tackifiers are, for example, natural resins, such as rosin resins and their derivatives formed by disproportionation or isomerization, polymerization, dimerization, hydrogenation.
  • Alcohols used for the esterification may be monohydric or polyhydric, for example methanol, ethanediol, diethylene glycol, triethylene glycol
  • hydrocarbon resins for example cumarone-indene resins, polyterpene resins, hydrocarbon resins based on unsaturated C-H compounds, such as butadiene, pentene, methylbutene, isoprene, piperylene, divinylmethane, pentadiene, are also found.
  • Cyclopentene, cyclopentadiene, cyclohexadiene, styrene, ⁇ -methylstyrene, vinyltoluene are also increasingly being used as tackifiers.
  • Also polyacrylates which have a low molecular weight are used.Preferably these polyacrylates have a weight-average molecular weight M w of less than 30 000.
  • the polyacrylates are preferably at least 60 , in particular at least
  • Ci-C 8 alkyl (meth) acrylates 80 wt .-% of Ci-C 8 alkyl (meth) acrylates.
  • Preferred tackifiers are natural or chemically modified rosin resins. Rosin resins consist predominantly of abietic acid or abietic acid derivatives.
  • the tackifiers can be added in a simple manner to the polymer dispersion.
  • the tackifiers are preferably themselves in the form of an aqueous dispersion.
  • the amount by weight of the tackifiers is preferably 5 to 50 parts by weight, more preferably 10 to
  • the adhesive composition may consist solely of the polymer or of the aqueous dispersion of the polymer, but it may also contain the abovementioned additives. and other additives such as fillers, dyes, flow control agents, thickeners, preferably associative thickeners, defoamers, pigments or wetting agents.
  • the adhesive compositions may in particular wetting aids, for. For example, fatty alcohol ethoxylates, Alkylphenolethoxylate, Nonylphenolethoxylate, polyoxyethylene / -propylenes or sodium dodecylsulfonate included.
  • the amount of additives is generally 0.01 to 5 parts by weight, in particular 0.1 to 3 parts by weight per 100 parts by weight of polymer (solid).
  • the carton blanks may be of a suitable material for producing cartons. Suitable materials are eg cardboard, cardboard, corrugated cardboard or plastic.
  • the surface may be paper-coated, laminated with films, coated with plastic, printed with ink, primed or painted.
  • the surface of the blanks can be coated eg with PP, OPP, PVC, PE or with waxes.
  • the thickness of the blank material is preferably 0.5 to 10 mm.
  • the adhesive composition can be applied to the folding box blanks by conventional application or coating methods, for example by means of a size press, film press, blade coater, air brush, doctor blade, curtain coating or spray coater.
  • the application is effected by means of a printing application technique, eg flexographic printing, offset printing or screen printing. Preferred is flexographic printing.
  • the printed adhesive coating After the printed adhesive coating has dried, it is so block-resistant that the printed flat folding-box blanks can be stacked without sticking to one another.
  • the printed adhesive is blockable so that a stack of the printed with the adhesive sheet blanks, which are usually cartons, can be stored under a weight of 2 tm 2 for up to one year without adhering to each other when separating the individual boxes.
  • the adhesive composition is applied to the intended for the blanks, not yet cut raw material and then carried out the production of the blanks, for example by punching or cutting.
  • the blanks may be completely or partially coated with the adhesive composition.
  • the adhesive composition is applied only in those limited areas that are actually bonded.
  • the applied amount (wet) is preferably 10 to 300 g / m 2 .
  • the layer thickness of the applied, dried adhesive is preferably from 5 to 200 ⁇ .
  • the adhesive-activating radiation may be done before the surfaces to be bonded are brought into contact with each other, or preferably while the surfaces are brought into contact. In general, this is done with a suitable for a permanent fixed connection high contact pressure.
  • the time of radiation activation of the adhesive layer in the straightening machine is preferably less than 2 seconds, less than 1 second or less than 0.5 seconds.
  • the adhesive layer becomes so sticky within the activation time that secure bonding of the folding carton takes place in the erecting machine, optionally with subsequent or simultaneous application of a contact pressure.
  • the bonding is considered sufficiently safe, if in the case of glued boxes, the bond can be solved only with complete fiber breakage.
  • the adhesive layer applied to a first portion of the surface of the blank may be adhered either to an adhesive layer applied to a second portion of the surface of the blank or to an adhesive-free portion of the blank.
  • the adhesive-free area can also be printed, primed or painted on the spot to be bonded.
  • the activation of the adhesive layer is preferably carried out with electromagnetic radiation, in particular microwave radiation of a wavelength in the range 1 mm to 1 m, preferably from 5 mm to 0.5 m.
  • Radiation sources are e.g. IR lamps, lasers, radio wave or microwave generators.
  • a preferred radiation source is a microwave concentrator with which microwaves can be focused, locally concentrated for local treatment of a workpiece and / or made usable for exciting plasma.
  • An arrangement for the concentration of microwave energy in a local area of action is described, for example, in DE 10 2006 034084.
  • Another device for producing microwaves for the treatment of workpieces is described in WO 00/75955.
  • a portable microwave oven for local applications is described in JP 08-019620.
  • the packages are filled before, immediately after or simultaneously with the energetically activated bonding with the ingredients to be packaged. It is particularly advantageous if the ingredients to be packaged are sensitive to heat or radiation and a microwave concentrator is used as the radiation source.
  • the adhesive activation can then be done in a very short time and locally limited, without heat or radiation sensitive ingredients of the packaging are affected.
  • Sensitive ingredients are, for example, chocolate, ice cream, fat or waxy products, pharmaceuticals, cosmetics and similar products.
  • the adhesive composition contains from 20 to 70% by weight, preferably from 30 to 50% by weight of at least one copolymer formed from at least one first monomer and from more than 3% by weight and less than 40% by weight. %, based on the total amount of monomers, of at least one second monomer other than the first monomer, wherein the first monomer is selected from the group consisting of alkyl acrylates, alkyl methacrylates and vinyl aromatics and the second monomer is selected from the group consisting of ethylenically unsaturated monomers with Acid groups, hydroxyalkyl acrylates and hydroxyalkyl methacrylates, from 2 to 30 wt.%, Preferably from 5 to 15 wt.% Of at least one electromagnetic radiation absorbing substance and
  • the Ig G 'values were measured as described above.
  • the bonding properties were evaluated by separating the bonded cardboard test pieces at the bonding site by pulling by hand.
  • the blocking resistance was evaluated by a test in which, under a weight of 2 g / mm 2 , the adhesive-coated and dried paperboard was stored against a second coated paperboard at 40 ° C for 3 days. The two adhesive layers were placed against each other.
  • Adhesive compositions dispersed or dissolved in water (in parts by weight):
  • Polymer 6 90 10 10 5.2 3.0 + -

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne l'utilisation d'une composition adhésive activable pour la production d'une découpe à plat de boîte pliante, ladite découpe à plat pourvue de la composition adhésive étant, à 25°C, résistante au blocage. La composition adhésive a, à une température inférieure ou égale à 25°C, une valeur G' Ig supérieure ou égale à 6 et, à une température supérieure ou égale à 120°C, une valeur G' Ig inférieure ou égale à 4, et contient un copolymère ayant une température de transition vitreuse supérieure à 30°C. Le copolymère est constitué d'un premier monomère et à raison de plus de 3 % en poids et moins de 40 % en poids, d'un deuxième monomère, le premier monomère étant sélectionné parmi des alkyl(méth)acrylates et des aromates de vinyle et le deuxième monomère étant sélectionné parmi des monomères éthyléniquement insaturés dotés de groupes d'acides et d'hydroxyalkyl(méth)acrylates.
PCT/EP2011/053265 2010-03-08 2011-03-04 Utilisation d'une composition adhésive activable pour la production de découpes à plat de boîtes pliantes WO2011110482A1 (fr)

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EP10155796.5 2010-03-08
EP10155796 2010-03-08

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WO2011110482A1 true WO2011110482A1 (fr) 2011-09-15

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3246325A1 (de) 1982-06-02 1984-06-20 Fit Container AG, 7000 Chur Verfahren zur herstellung von der bildung von faltschachteln dienender zuschnitte sowie vorrichtung zum aufrichten und verschweissen derselben
JPH0819620A (ja) 1994-07-06 1996-01-23 O G Giken Kk 局所治療用可搬型マイクロ波治療器
US5837089A (en) * 1994-01-12 1998-11-17 Ashland Inc. Heat reactivatable adhesive
WO2000075955A1 (fr) 1999-06-04 2000-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif a dilatation lineaire destine au traitement micro-ondes de grande surface et a la production de plasma grande surface
WO2004076578A1 (fr) 2003-02-22 2004-09-10 National Starch And Chemical Investment Holding Corporation Adhesif reactivable
DE102006034084A1 (de) 2006-07-20 2008-01-24 Muegge Electronic Gmbh Anordnung zur Konzentration von Mikrowellenenergie

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3246325A1 (de) 1982-06-02 1984-06-20 Fit Container AG, 7000 Chur Verfahren zur herstellung von der bildung von faltschachteln dienender zuschnitte sowie vorrichtung zum aufrichten und verschweissen derselben
US5837089A (en) * 1994-01-12 1998-11-17 Ashland Inc. Heat reactivatable adhesive
JPH0819620A (ja) 1994-07-06 1996-01-23 O G Giken Kk 局所治療用可搬型マイクロ波治療器
WO2000075955A1 (fr) 1999-06-04 2000-12-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif a dilatation lineaire destine au traitement micro-ondes de grande surface et a la production de plasma grande surface
WO2004076578A1 (fr) 2003-02-22 2004-09-10 National Starch And Chemical Investment Holding Corporation Adhesif reactivable
DE102006034084A1 (de) 2006-07-20 2008-01-24 Muegge Electronic Gmbh Anordnung zur Konzentration von Mikrowellenenergie

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
JULI 1987, ADHESIVE AGE, pages 19 - 23
POLYM. MATER. SEI. ENG., vol. 61, 1989, pages 588 - 592
W. MÄCHTLE, MAKROMOLEKULARE CHEMIE, vol. 185, 1984, pages 1025 - 1039

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