EP3047068A1 - Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant - Google Patents

Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant

Info

Publication number
EP3047068A1
EP3047068A1 EP14771294.7A EP14771294A EP3047068A1 EP 3047068 A1 EP3047068 A1 EP 3047068A1 EP 14771294 A EP14771294 A EP 14771294A EP 3047068 A1 EP3047068 A1 EP 3047068A1
Authority
EP
European Patent Office
Prior art keywords
starch
coating composition
plasticizer
weight
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14771294.7A
Other languages
German (de)
English (en)
Other versions
EP3047068B1 (fr
Inventor
Rolf Müller
Federico Innerebner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Innogel AG
Original Assignee
Innogel AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Innogel AG filed Critical Innogel AG
Publication of EP3047068A1 publication Critical patent/EP3047068A1/fr
Application granted granted Critical
Publication of EP3047068B1 publication Critical patent/EP3047068B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

Definitions

  • Packaging material with a starch-based barrier coating and coating composition and method for producing the same
  • the invention relates to a packaging material with a starch-based barrier coating, to a process for the production of a packaging material with a starch-based barrier coating, to a starch-based coating composition and to its use for the surface sealing of packaging materials.
  • W013076241 A2 proposes using aqueous dispersions based on polyvinyl acetate for producing a coating on film-like substrates for reducing the diffusion of oily substances from packaging into foods and medical devices.
  • the barrier layer based on polyvinyl acetate is not soluble in water and thus interferes with the recycling of a cardboard treated in this way in current recycling processes.
  • the use of a synthetic, poorly biodegradable coating tarnishes the reputation of carton packaging as an ecologically highly advantageous packaging solution.
  • coatings are comparatively expensive, there is still a need for cost-effective, ecologically sensible coating compositions with a good barrier effect.
  • Starch-based coatings are known in the paper industry. These are used, for example, in the paper coating in coating colors to give cardboard more strength, or to improve the paper properties, such as reducing dust and smoothing surfaces, for better printability. Starch develops a high viscosity when cooking in solution even at low solids content.
  • a 10% starch solution at 40 ° C have a viscosity of> 5,000 mPas and is therefore not useful in conventional brushing.
  • partially degraded starches are generally used with average molecular weights of M w -1 000 000 g / mol in order to keep the viscosity of the starch solution and thus of the coating mass within manageable limits (for example a 50% strength starch solution having a viscosity of ⁇ 3,000 mPas at 40 ° C).
  • Starch coatings of such degraded, degraded or partially degraded starches are relatively brittle and break easily in the manufacture of cardboard packaging.
  • the mechanical stresses during folding and grooves of the cardboard do not withstand such coatings, so that unwanted defects in the coating caused by the turn mineral oil residues can migrate into the packaged food.
  • Such compositions are therefore not useful as a barrier coating.
  • An object of the invention is thus to provide improved compositions for the coating of packaging materials, which can be used in an economically meaningful manner, efficiently and inexpensively applied to flat substrates and at the same time have an excellent barrier property.
  • the present invention relates to a multilayer packaging material comprising a planar substrate and at least one starch-based barrier layer applied thereto.
  • Another aspect of the invention relates to a process for the preparation of this packaging material.
  • the invention further relates to a coating composition which is suitable for producing the packaging material according to the invention and is preferably used for the production of the packaging material.
  • the invention relates to the use of a starch-based coating composition for surface sealing of packaging materials in order to prevent or reduce the migration of, for example, lipophilic contaminants contained in the packaging material into the packaged product.
  • the coating compositions according to the invention are preferably used for this purpose.
  • Lipophilic impurities in the context of the present invention include mineral oil impurities resulting, for example, from residues of printing inks in recycled paper.
  • the impurities include linear, cyclic and aromatic hydrocarbons, in particular MOSH and / or MOAH.
  • starch As a natural polymer from renewable resources, starch has the distinct advantage that the price is low and the environmental balance is positive compared to synthetic products. Another advantage is that starch is already established in the paper industry and does not pose a disruptive factor in existing recycling processes.
  • a coating composition in the form of a solution with long-chain, ie high molecular weight, starch molecules is used, which can be efficiently applied with a high solids content to a suitable substrate or a carrier layer of a packaging material, preferably on paper, board or cardboard is then filmed on the substrate to form a coherent barrier layer or a coherent barrier film.
  • This barrier layer substantially restricts or prevents the migration of lipophilic contaminants from the package or packaging into the packaged product. It has surprisingly been found that long-chain starch types can usefully be used for coating and the use of long-chain starch types in the bamere coating also leads to significantly better mechanical properties and barrier properties of the coating.
  • the coating composition of the invention is used as a solution, preferably as an aqueous solution, the solids content of which contains starch as the main component.
  • the barrier effect is critically dependent on obtaining a blanket barrier coating that is virtually free of imperfections (eg pinholes) and that the bamble coating is flexible and non-tacky so that the resulting multilayer packaging material, such as the coated paper, can be processed by means of the usual in the packaging industry creasing and folding without the bamere coating is damaged or impaired significantly. This is the only way to ensure that the packaged goods, for example the packaged foodstuffs, are adequately protected against the entry of the above-mentioned contaminants, even during prolonged storage periods.
  • the coating composition according to the invention is based on starch.
  • the lower the molecular weight of the starch used the more brittle the starch or the barrier film produced therefrom, even at higher plasticizer contents. Brittle films are unusable as a barrier because they break easily or crack and thus allow the passage of impurities.
  • the viscosity of starch in solution increases massively with the molecular weight of the starch used. The viscosity in solution is primarily dominated by the largest starch macromolecules. However, in order to be able to apply the starch to a packaging material, for example a paper, economically, a low viscosity of the composition used for coating is desired.
  • the viscosity of the solution can be achieved by using a low solids content which correlates with a high water content of the solution.
  • this water must be dried away at high cost in the production of packaging materials. The way out of this situation opens up the inventive approach in which particularly advantageous compositions for the coating of packaging materials have been developed.
  • the coating composition according to the invention is obtained from a coating composition comprising the constituents mentioned below for the coating composition, it being possible to use for the at least one starch any starch having a molecular weight M w of at least or more than 0.8 million g / mol.
  • the starch (s) and optionally further existing solid and / or liquid additives are typically stirred into an aqueous solution, preferably in water.
  • coating composition and coating composition differ in that the coating composition in the sense of the present patent application means the composition which can be directly used for coating or in which the starch is already present in dissolved form.
  • M w the weight average molecular weight
  • the inventive starch-based coating composition comprises
  • the present patent application states that all stated amounts of starch are based on the sum of the proportions of starch plus plasticizer plus water. Accordingly, the softener components are based on the sum of starch plus plasticizer.
  • the proportion of the polymeric additive (s) is based on the sum of starch plus polymeric additive.
  • the proportion of the additive (s) is based on the dry mixture or composition.
  • the proportion of water is understood as the remainder to 100 wt .-%, wherein a filler, if any, is not taken into account in the calculation.
  • the starch is present in ready-to-use, finished coating mass in dissolved form.
  • the coating composition consists of the at least one starch, the proportion of which, based on starch, plasticizer and water, is determined in accordance with Table 1 explained below, 0-70% by weight of at least one plasticizer, 0-50 wt .-% of at least one polymeric additive, 0-5 wt .-% of at least one additive, and a residue of water to 100 wt .-%.
  • the lower limit for the molecular weight M w of at least one starch in millions of g / mol is 0.8, preferably 1, 0, more preferably 1, 5, more preferably 2 , 0, more preferably 2.25, even more preferably 2.5, even more preferably 2.75, most preferably 3.0.
  • the upper limit for the molecular weight M w of the at least one starch in millions of g / mol in the coating composition is about 20, preferably 15, more preferably 12, even more preferably 10, even more preferably 9, even more preferably e, even more preferably 7, most preferably 6.
  • the upper limit for the molecular weight M w of the at least one starch may be greater than 20 million g / mol, preferably in the range of greater than 20 to 50 million g / mol.
  • the proportion of starch in wt .-% in the coating composition, based on starch and plasticizer and water, is dependent on the molecular weight M w of the starch and is represented by the following Table 1.
  • the lower limit of the amount of starch in wt% for the respective molecular weights is given in Table 1 on line A1, a preferred lower limit on line A2, an even more preferred lower limit on line A3, an even more preferred lower limit on line A4, an even more preferred lower limit on line A5, an even more preferred lower limit on line A6, an even more preferred lower limit on line A7, most preferably on line A8.
  • the upper limit of the amount of starch in wt% for the respective molecular weights is given in Table 1 on line B1, a preferred upper limit on line B2, an even more preferred upper limit on line B3, an even more preferred upper limit on line B4, one more more preferred upper limit on line B5, an even more preferred upper limit on line B6, an even more preferred upper limit on line B7, most preferred is the upper limit according to line B8.
  • the lower and upper limits for the amount of molecular weight starch between or outside the values of Table 1 can be obtained by linear interpolation or by linear extrapolation.
  • the values can be obtained by linear extrapolation.
  • the erfindungsmässe coating composition may further contain one or more fillers.
  • the proportion of filler (s) is not taken into account in the calculation of the 100% by weight. Rather, the filler is added in addition to the 100 wt .-%.
  • the weight proportions of the substances mean in each case the dry substances and not the substances in their commercial form in which they contain a certain water content as moisture.
  • the water content in each case means the entire water, ie the water supplied plus the water, which is present in the substances, such as starch, as moisture / bound.
  • wt .-% always means weight fraction per part by weight.
  • the lower limit of the viscosity of the ready-to-use or employed coating compositions according to the invention in mPas, measured at 40 ° C. with a Brookfield viscometer at a rotational speed of 100 rpm, is 50, preferably 70, more preferably 100, 100 most preferred at 150.
  • the upper limit of the viscosity in mPas is 5 ⁇ 00, preferably 3 ⁇ 00, more preferably 2,500, more preferably 2,200, even more preferably 2 ⁇ 00, even more preferably 1 1800, even more preferably 1 1600, most preferably 1 '500th
  • the viscosity of the coating composition is in the range of 200 to 1000 mPas.
  • the pH of the coating composition according to the invention is preferably> 4, preferably> 5, preferably> 6, more preferably> 6.5, most preferably> 6.7 and on the other hand preferably ⁇ 10, preferably ⁇ 9, preferably ⁇ 8.5 ,
  • any starches or mixtures thereof may be used as the starch in terms of origin and preparation. They can be used, for example, in the native state as well as in the physically and / or chemically / enzymatically modified state. With regard to origin, root strengths, such as potato starches or tapioca starches, are preferred. Particularly preferred is tapioca starch. Tapioca starch is colorless and tasteless and there are no known genetically modified variants of tapioca starch. Further preferred is pea starch, since it has been shown to have particularly good film-forming properties.
  • the strength is native, i. unmodified state used.
  • useful properties can be obtained at low cost.
  • substituted starches such as starch esters and starch ethers
  • starch esters and starch ethers are used, such as, for example, hydroxypropylated or acetylated starches.
  • oxidized starches are used.
  • hydroxypropylated starches are used.
  • crosslinked starches are used, in particular crosslinked starch esters or crosslinked starch ethers, for example starch phosphates and starch adipates.
  • the crosslinking is weak.
  • Such starches are commercially available. Increasing the molecular weight associated with crosslinking provides improved mechanical properties.
  • Particularly preferred are crosslinked hydroxypropylated starches, in particular weakly crosslinked hydroxypropylated starches. For ease of processing, non-crosslinked hydroxypropylated starches are preferred.
  • the starch is a non-crosslinked starch or a mixture of non-crosslinked starches.
  • substituted tapioca starch is used, in particular hydroxypropylated tapioca starch.
  • crosslinked substituted tapioca starch such as hydroxypropylated starch phosphate.
  • substituted pea starch is used, in particular hydroxypropylated pea starch.
  • cross-linked substituted pea starch such as hydroxypropylated starch phosphate.
  • amylose content of the starch (s) in% by weight is preferably ⁇ 60, more preferably ⁇ 50 even more preferably ⁇ 40, even more preferably ⁇ 37, even more preferably ⁇ 35. It has been found that high amylose contents result in a reduced elongation capacity of the barrie - can lead re-coating.
  • no so-called "waxy" starches are used in the coatings according to the invention and the coating compositions.
  • the DE value is a measure of how far the polymer has degraded, with high DE values, poor mechanical properties are obtained ISO standard 5377.
  • starches are permitted which are approved for applications for contact with food.
  • a starch is considered as dissolved if, when viewed in a polarizing microscope, at least 80%, preferably at least 90%, preferably at least 95%, preferably at least 97%, more preferably at least 99% of the starch granules are in the swollen state and are no longer birefringent.
  • At least 10%, more preferably more than 30%, even more preferably more than 50%, even more preferably more than 70% and even more preferably more than 90% of these starch granules have burst or have already broken down into fragments.
  • the dissolved starch is a true molecular solution in which the starch granules are completely destructured, that is, destroyed, and no longer are any fragments of starch granules.
  • the dissolved form of starch is typically obtained in aqueous systems by the following measures: boiling the starch, especially with a jet cooker, heating to a temperature above the gelatinization temperature, dissolving extruded amorphous starch, using pregelatinized starch.
  • the starch granules initially absorb water and gelatinise. Gelatinized starch granules easily break down into fragments under shear and these can then dissolve completely.
  • the gelatinized starch granules disintegrate into fragments, eventually creating a true molecular solution.
  • the degree of destructuring of the starch granules can be determined and determined by means of simple light microscopic observation, for example at 200 ⁇ magnification.
  • the starch is stained with iodine.
  • a high molecular weight M w of the starch is a prerequisite.
  • the at least one starch used for formulating the coating composition therefore has a molecular weight M w in millions of g / mol of at least 0.8, preferably 1, 0, more preferably 1, 5, even more preferably 2.0, even more preferably 2, 25, more preferably 2.5, more preferably 2.75, most preferably 3.0.
  • An upper limit for the at least one starch for formulating the coating composition generally does not exist. The reason for this is that at very high molecular weights, such as> 20 million g / mol, the starch macromolecules are mechanically unstable.
  • the mass is stirred while cooking the starch, and the shear that occurs in this case is already sufficient to break the macromolecules, whereby a molecular weight M w of ⁇ 20 million g / mol can quickly result.
  • molecular weights M w typically, at the usual stirring rates, molecular weights M w of about 15 million g / mol or even 12 million g / mol.
  • starches are used whose upper limit of molecular weight M w is in millions of g / mol, preferably 20, more preferably 15, even more preferably 12, even more preferably 10, even more preferably 9, even more preferably e more preferably 7, most preferably 6.
  • the preparation of the coating composition becomes easier and, finally, lower viscosities are obtained.
  • plasticizers are in principle all plasticizers listed in the prior art for starch and any mixtures thereof. Unless otherwise specified, the term plasticizer in the present application is intended to include a plasticizer and mixtures of plasticizers.
  • Plasticizers can be used singly or in mixtures of different plasticizers. Preference is given to using polyols, for example glycerol, sorbitol, maltitol, erythritol, xylitol, mannitol, galactitol, tagatose, lactitol, malolactulose, isomalt, maltol, etc., but also various sugars, such as sucrose / sucrose, maltose , Trehalose, lactose, lactulose, galactose, fructose, etc., as well Monosaccharides and oligosaccharides. Glycerol is particularly preferred as a plasticizer. Water is also a plasticizer for starch, but is not included in the plasticizers and taken into account separately.
  • the upper limit of the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer, is 70, preferably 60, more preferably 55, more preferably 50, even more preferably 46, most preferably 42.
  • the lower limit of the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer, in one embodiment is 0.
  • the lower limit for the plasticizer content of the coating composition in% by weight, based on starch plus plasticizer is preferred 5, more preferably 10, more preferably 15, even more preferably 20, even more preferably 25, even more preferably 28, even more preferably 31, even more preferably 32.5, most preferably 33.5.
  • the limits for the plasticizer content of the barrier layer correspond to the limits for the plasticizer content of the coating composition.
  • plasticizers having a maximum melting temperature of 150 ° C for the anhydrous plasticizer, preferably 125 ° C, more preferably 1 10 ° C, even more preferably 95 ° C, most preferably 70 ° C are used.
  • the proportion of these plasticizers in the total plasticizer content is in wt .-%> 50, preferably> 70, more preferably> 80, most preferably> 90. With decreasing melting temperature of the plasticizer whose softening effect increases.
  • plasticizers having a molar mass in g / mol of> 90, preferably> 120, preferably> 140, preferably> 150, most preferably> 160 are used.
  • the proportion of plasticizers which fulfill this condition in the total plasticizer content of the coating composition is in wt .-%> 10, preferably> 20, more preferably> 30, most preferably> 40.
  • the Plasticizer With increasing molecular weight of the plasticizer decreases its migration ability, the Plasticizer then has a reduced tendency to migrate from the barrier coating into the substrate of the packaging material, for example the paper. By migrating the plasticizers, the barrier coating loses flexibility.
  • a combination of at least 2 plasticizers is used, preferably of at least 3 plasticizers, in which combination the individual plasticizers are represented by at least 5%, preferably at least 10, most preferably at least 15%.
  • Two isomeric plasticizers are considered as different plasticizers.
  • the combination of plasticizers can reduce the tendency of the individual plasticizers to crystallize. Upon crystallization, the softening effect disappears.
  • the coating composition may optionally be admixed with at least one further polymeric additive in order to obtain the mechanical properties Properties of the barrier coating or barrier layer to modify advantageous, in particular to increase their flexibility, and to improve the processability of the coating composition.
  • these modifying polymers contribute to an increase in the solids content.
  • Suitable modifying polymers are in principle all hydrophilic substances and mixtures thereof, in particular hydrophilic polymers and preferably those from vegetable sources.
  • this polymer contains polar groups, such as hydroxyl groups, carboxyl groups, or ionic groups, such as carboxylate or sulfonate groups.
  • modifying polymers are hydrocolloids and gums, such as galactomannans, such as guar gum or locust bean gum; Cellulose derivatives, in particular cellulose ethers; Pectins, in particular rhamnogalacturonans and protopectins; dextrans; xanthan; zymosan; Seaweed hydrocolloids such as alginates, agar-agar, agarose, carrageenan and carrageenans; furcellaran; Hydrocolloids off Lichens such as lichenin and isolichenine, or hydrocolloids as exudates of wood such as tragacanth (astragalus gum), karaya gum, gum arabic, kutira gum; inulin; Latex; chitin; chitosan; gellan;
  • the maximum level of modifying polymer or modifying polymers of the coating composition, as well as in the barrier coating, in weight percent, based on starch plus modifying polymer is 50, more preferably 40, even more preferably 30, even more preferably 20 more preferably 10, more preferably 5, even more preferably 2.5, most preferably 1, 5.
  • the minimum amount of modifying polymer or modifying polymers of the coating composition, as well as in the barrier coating, in weight percent, based on starch plus modifying polymer, is 0.01, preferably 0.05, more preferably 0.1, even more preferably 0.3, more preferably 0.6, even more preferably 0.8, most preferably 1.0. Since the modifying polymer is an optional component, the minimum amount may also be 0% by weight.
  • xanthan gum is used as the modifying polymer, since xanthan gum can also particularly effectively prevent the sedimentation of solids suspended in the coating composition, such as fillers, and, if appropriate, residues of starch granules.
  • a maximum proportion of ⁇ 2.5% by weight of xanthan as modifying polymer of the coating composition and of the barrier coating has proved to be particularly advantageous in further embodiments.
  • the minimum amount of xanthan in% by weight is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • Xanthan gum may be used in particular in combination with any one or more of the aforementioned starches. In particular, any combination with the other components, ie, plasticizers, polymeric additives, fillers, additives, lecithin and fatty acids according to the invention are also included.
  • water-soluble cellulose derivatives are used, for example methylcellulose, ethylcellulose, hydroxyethylcellulose se, carboxymethylcellulose, hydroxyethylmethylcellulose or hydroxypropylmethylcellulose.
  • PVA polyvinyl alcohol
  • PVA polyvinyl alcohol
  • a 4% solution of the PVA at 20 ° C. according to DIN 53015 has a viscosity in mPas of> 3, preferably> 5, more preferably> 7, more preferably> 10, most preferably> 15.
  • the maximum level of PVA in weight percent based on starch plus PVA is 40, more preferably 30, even more preferably 20, even more preferably 15, even more preferably 10, even more preferably 7, even more preferably 5, most especially 4.
  • the minimum amount of PVA in wt.% is 0, preferably 0.1, more preferably 0.3, even more preferably 0.6, even more preferably 1, even more preferably 1.5, even more preferably 2, most preferably 3 PVA may be used in particular in combination with any one or more of the aforementioned starches.
  • any combination with the other components, ie plasticizers, polymeric additives, fillers, additives, lecithin and fatty acids according to the invention are also included.
  • xanthan and PVA are, of course, to be understood as meaning that, if one or both components are present, they form a proportion of the modifying polymers or the modifying polymer contains only xanthane and / or PVA.
  • the quantitative ranges for xanthan and PVA are therefore not to be understood as being additive to the abovementioned general quantitative ranges for the modifying polymer (s).
  • the limits for the proportion of modifying polymer of the barrier coating correspond to the limits for the proportion of modifying polymer in the coating composition.
  • the filler component of the coating composition or of the barrier coating is all components which are virtually insoluble in water or are present in the coating composition, as well as in the barrier coating, in the form of particles, such as, for example, pigments, glass particles, soot particles, mineral particles such as titanium dioxide, Talc, carbonates.
  • the filler component is mathematically subtracted from the formulas, as it is not essential to most functional components of the formulation whether a filler component is present or not. Unless otherwise indicated and nothing else is obvious, therefore, the percentages by weight relating to the composition of the barrier coating in the following embodiments mentioned as particularly preferred in each case relate to the proportions without an optionally additionally present filler component.
  • the proportion of the filler component in% by weight in the case of the dry barrier layer ie the total mass of starch and optional components, but without water, is ⁇ 50, more preferably ⁇ 30, more preferably ⁇ 20, even more preferably ⁇ 10, more preferably ⁇ 5, most preferably ⁇ 3.
  • the flexibility of the barrier coating is mainly reduced at higher levels of filler.
  • the minimum amount of filler component in weight percent in the dry barrier layer is 0.1, more preferably 0.2, even more preferably 0.5, even more preferably 0.8, most preferably 1.0. Since the filler component is an optional component, the minimum level may also be 0% by weight.
  • the limits for the filler content of the barrier coating correspond to the limits for the filler content of the coating composition.
  • the coating composition of the invention may further optionally comprise one or more additives.
  • additives can be used as further components of the coating composition: surface-active substances, such as ionic or nonionic surfactants, wetting agents, defoamers, stabilizers, dyes, other polymers than those already mentioned, biocides, pH regulators, thixotropic agents.
  • the proportion of the additive or additives, based on the dry coating composition is 0 to at most 5% by weight.
  • the proportion is preferably ⁇ 3, more preferably ⁇ 2, even more preferably ⁇ 1, most preferably ⁇ 0.7. If present, the minimum level of additive (s) is preferably 0.1% by weight.
  • the limits for the additive content of the barrier coating correspond to the limits for the additive content of the coating composition.
  • the coating composition according to the invention and thus the barrier layer may also optionally contain lecithin and / or fatty acids.
  • the lecithin is preferably soy lecithin. Lecithin reduces the water sensitivity of the barrier layer, in particular, the toughness is increased at low humidity.
  • the lower limit of the lecithin content in the coating composition or the barrier layer in% by weight, based on the starch is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • the upper limit of the lecithin content in the coating composition or the barrier layer in% by weight, based on the starch is 10, preferably 7, more preferably 5, even more preferably 4, even more preferably 3.
  • fatty acids are preferred. Stearic acid is particularly preferred. Fatty acids reduce the water sensitivity of the barrier layer, in particular, the stickiness is increased at high humidity.
  • the lower limit of the fatty acid content in the coating composition or the barrier layer in% by weight, based on the starch, is 0, preferably 0.01, more preferably 0.05, even more preferably 0.1.
  • the upper limit of the fatty acid content in the coating composition or the barrier layer in% by weight, based on the starch, is 10, preferably 7, more preferably 5, even more preferably 4, even more preferably 3.
  • Water is important for adjusting the viscosity of the coating composition.
  • a high water content makes drying difficult, as more water has to be removed from the barrier coating.
  • the proportion of water for the formulation of or in the coating composition results arithmetically from the difference of 100% by weight minus the sum of the percentages by weight of all components other than the fillers.
  • compositions of the coating composition have proved to be particularly suitable for providing a barrier layer with regard to the mechanical properties and / or the barrier effect of the barrier layers obtained therefrom and to the processability of the coating composition:
  • the starch is a hydroxypropylated pea starch having a molecular weight in millions of g / mol ranging from 1 to 20, preferably from 2.5 to 10.
  • the plasticizer is preferably glycerin.
  • the plasticizer content in wt .-%, based on starch and plasticizer, is in the range of 0-45, preferably from 15 to 37, the starch content, based on starch and water and plasticizer, is in the range of 14 to 35 wt .-% ,
  • the coating composition preferably also comprises a proportion of PVA of 1 to 30% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight.
  • barrier layer is preferably applied in two passes, For each pass preferably a basis weight (dry) of 5 to 15 g / m 2 is applied.
  • the starch is a hydroxypropylated tapioca starch having a molecular weight in millions of g / mol in the range from 1 to 20, preferably from 2.5 to 10.
  • the plasticizer is preferably glycerol.
  • the plasticizer content in wt .-%, based on starch and plasticizer is in the range of 0-45, preferably from 15 to 37, the starch content, based on starch and water and plasticizer, is in the range of 14 to 35 wt .-%
  • the coating composition preferably also comprises a proportion of PVA of 1 to 30% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight.
  • the starch is a hydroxypropylated potato starch having a molecular weight in millions of g / mol in the range from 1 to 20, preferably from 2.5 to 10.
  • the plasticizer is preferably glycerol.
  • the plasticizer content in wt .-%, based on starch and plasticizer is in the range of 0-45, preferably from 15 to 37, the starch content, based on starch and water and plasticizer, is in the range of 14 to 35 wt. -%.
  • the coating composition preferably also comprises a proportion of PVA of 1 to 30% by weight, preferably 1 to 20% by weight, more preferably 1 to 10% by weight.
  • barrier layer is preferably applied in two passes, wherein a basis weight (dry) of 5 to 15 g / m 2 is preferably applied on each pass.
  • the present invention relates to the use of a starch-based coating composition or coating composition for Surface sealing of packaging materials to prevent or reduce the migration of lipophilic contaminants contained in the packaging material, such as mineral oil residues, in particular MOSH and / or MOAH.
  • the coating composition used comprises - at least one starch having a molecular weight M w in the range of 800 ⁇ 00 to 20 ⁇ 00 ⁇ 00 g / mol,
  • plasticizer - 0-70 wt .-% plasticizer, wherein the plasticizer content based on starch plus plasticizer,
  • polymeric additive 0-50% by weight of a polymeric additive or of several polymeric additives, the proportion of the polymeric additive (s) being based on starch plus polymeric additive,
  • the lower limit and the upper limit for the proportion of the at least one starch in the coating composition in wt .-%, based on starch, plasticizer and water, depending on the molecular weight M w of the at least one strength is given by:
  • the inventive starch-based barrier layer comprises
  • At least one starch with a weight average molecular weight distribution M w in g / mol of 0.8 million up to 20 million
  • plasticizer - 0-70 wt .-% plasticizer, wherein the plasticizer content based on starch plus plasticizer, - 0-50 wt .-% of a polymeric additive or more polymeric additives, wherein the proportion of the / of the polymeric additives based on starch plus polymeric additive is
  • the barrier layer according to the invention may further comprise fillers.
  • the plasticizer the polymeric additives and the additives as well as the optionally also present filler reference is made to the above statements.
  • Part of the water of the coating composition may be bound in the solidified barrier layer.
  • the remaining water is lost mainly in the drying of the packaging material.
  • the maximum water content of the barrier layer in the finished packaging material immediately after the production is at most 25% by weight, preferably at most 20% by weight, more preferably at most 15% by weight, even more preferably at most 10% by weight, still more preferably at most 7 Wt%, more preferably at most 5 wt%, and most preferably at most 3 wt%.
  • the finished, dried barrier layer is preferably solid and not sticky.
  • the upper limit for the basis weight (dry matter) of the barrier in g / m 2 is therefore 80, preferably 70, more preferably 60, more preferably 55, more preferably 50, even more preferably 45, even more preferably 40, more preferably 35, more preferably 30, most preferably 25.
  • the lower limit for the basis weight of the barrier in g / m 2 is 3, preferably 5, more preferably 7, more preferably 9, most preferably 10.
  • the upper limit for the basis weight (dry weight) in g / m 2 for a single job is preferably 30, preferably 25, more preferably 20, more preferably 18, even more preferably 17, even more preferably 16, even more preferably 15, most preferably 14. The thinner the job is, the less blistering and pinholes are to be expected and the easier it is to dry the coating.
  • the lower limit of the basis weight (dry matter) in g / m 2 for a single application is preferably 3, preferably 4, more preferably 5, more preferably 6, even more preferably 7.
  • the thicker the coating the better The cover of the paper and the more effective the barrier becomes.
  • the barrier layers according to the invention are or remain flexible even on the packaging material. This is surprising since a per se flexible starch film, when applied to a paper, can often lose a lot of flexibility. If, for example, a casting material based on starch is poured onto a Teflon film and dried, then a soft and flexible film can be obtained. However, applying the same casting compound to a paper can result in a hard, inflexible film that already cracks even without mechanical stress.
  • the barrier layers obtained according to the invention are characterized in that they are nationwide and have no defects, such as in the form of pinholes. Pinholes or blisters typically result from the drying of the applied coating composition. After the coating composition has been applied to the paper, part of the coating composition is absorbed by the nearest paper layers. During drying, the coated paper side is treated with infrared radiation and / or hot air. The surface of the coating dries faster than the underlying layers, forming a barrier against the vapor in the area of the surface, which wants to escape from the lower layers. This leads to the formation of vapor bubbles, which eventually burst open and lead to defects in the barrier layer.
  • the packaging material according to the invention is multi-layered and comprises a flat substrate as carrier layer and at least one barrier layer applied to the planar substrate, which is composed and constructed as explained above.
  • the barrier coating is applied to a flat substrate, which is suitable as packaging material.
  • the sheet-like substrate is preferably a paper, a cardboard or a cardboard. Unless otherwise mentioned, in the context of the present patent application the term paper should always also include cardboard.
  • Papers suitable as a barrier coating substrate have a basis weight in g / m 2 of preferably ⁇ 800, more preferably ⁇ 600, even more preferably ⁇ 500, even more preferably ⁇ 400, most preferably ⁇ 380.
  • m 2 is preferably> 30, more preferably> 50, more preferably> 70, even more preferably> 90, even more preferably> 110, most preferably> 120.
  • Paper is understood to mean paper in the strict sense as well as cardboard and paperboard. Particularly preferred papers are used as a substrate for the packaging material or as a carrier material for the barrier coating, which are permitted under food law and thus can be used as food packaging.
  • the barrier coating is applied to the back side of the substrate, ie the side which forms the inside of the packaging in the finished packaging. This results from the fact that a barrier with respect to the interior of the packaging or the packaged goods present therein should be obtained.
  • the backs of papers suitable for packaging are typically rough, while those for most a printing provided front pages are relatively smooth. However, papers with rather smooth backs are preferred, since smooth surfaces can be finished much easier with good barrier coatings.
  • a smoother reverse side can be obtained for example by means of a pre-coat.
  • the precursor means a layer which is applied to the paper substrate before the barrier layer.
  • the precoat can already be applied to the paper manufacturer.
  • the packaging materials according to the invention can have on the front side of the substrate, so the outside of the finished package, further, known in the art coatings or printed.
  • the barrier layer does not form the outside of the finished package, but is arranged so that it delimits the surface substrate, so the carrier material from the interior of the package and thus of the packaged goods contained in the package.
  • further layers may comprise on packaging material according to the invention.
  • the present invention also relates to packaging, in particular folded packages, which can comprise or be produced from the packaging material according to the invention.
  • the starch-based barrier layer does not form the outside of the package.
  • the applied barrier layer consists of at least one layer.
  • the barrier layer is thus produced or applied in at least one application (passage, line).
  • 2 jobs are made with the application mass being dried therebetween. Also 3 and more orders are possible, whereby 2 orders are preferred, and 3 orders are preferred before 4 orders.
  • the method according to the invention for producing the multilayer packaging material comprises the following steps: a) providing a planar substrate which preferably comprises a material selected from the group consisting of paper, cardboard and paperboard, b) providing the coating composition according to the invention c) applying the coating composition of Step b) at least one
  • the coating composition according to the invention can be provided by mixing the powdery starch present in a liquid phase, the liquid phase having at least water, preferably at least water and plasticizer.
  • the resulting suspension is then heated or "boiled” to a temperature above the gelatinization temperature
  • the suspension can be cooked, for example, at atmospheric conditions, ie at a temperature of ⁇ 100 ° C, or at temperatures> 100 ° C, for example cooked at 130 ° C with a jet cooker.
  • precooked starch instead of cooking starch, i. Starch that must be cooked to develop viscosity, also precooked starch, such as pregelatinized starch.
  • precooked starch such as pregelatinized starch.
  • a starch kitchen is typically present in the paper industry by default, it is more advantageous to use the cheaper cooking strength.
  • Starch grain can absorb a multiple of its own weight of water, but initially present as a suspended particle. If the starch grain is maximally swollen, then the highest viscosity results. The higher the temperature at which the starch is cooked, the longer it is cooked and the more intensively the mixture is sheared, for example by a mixer, the more the swollen starch grain decomposes. First, it breaks down into fragments, which in turn disintegrate into smaller fragments, until finally a true molecular solution is created.
  • the viscosity is significantly reduced without the molecular weight having to decrease. Since the lowest possible viscosities are desired, it is advantageous if the starch is cooked to the extent that more or less a molecular solution has formed, which is typically the case when cooking with the jet cooker and using shear. If precooked starch is used, the cooking process is unnecessary, but it is advantageous to shear the mixture mechanically, for example by intensive stirring, in order to break down the starch granules and, if possible, to obtain a true solution of the starch macromolecules.
  • the pH is within a range where no chemical degradation of the starch takes place, for example at a pH of> 4, preferably> 5, more preferably> 6, more preferably> 6.5 is the case.
  • the pH is in the range of 7.
  • the starch composition prepared in this way can then be applied to the paper with the desired weight per unit area using the methods known in the paper industry. While typical coatings in the paper industry are applied to the front of the paper, for a barrier layer the coating is applied to the back of the paper.
  • the coating can be carried out in various ways: for example, the barrier can be painted, printed, cast, sprayed, rolled or otherwise stained. be applied regularly and evenly. The necessary for the formation of an effective barrier layer thickness can be applied in one or more passes.
  • the barrier mass is applied by brushing or glazing.
  • Known and suitable coating methods are, for example, blade coating, knife coating and size press.
  • a particularly suitable casting method is curtain coating, in which case good barrier coatings with comparatively low application quantities could be obtained in particular.
  • the barrier coating is prepared in more than one stroke.
  • the coating is produced in 2 coating passes between which the substrate web does not necessarily have to be rolled up again.
  • a better barrier is obtained when a barrier layer of a given basis weight of eg 20 g / m 2 is applied in 2 passes, eg 10 g / m 2 being applied, instead of one pass where 20 g / m 2 is applied become.
  • a sufficient barrier coating can be obtained in 1 or 2 passes. For a rough paper, 2 to 4 strike passes may be necessary.
  • a first barrier layer or a first application for the barrier layer is obtained in-line with a paper machine. That the first application is obtained as a backsize immediately following the production of the paper on the fresh paper without the paper web having been previously rolled up. The second job is then done elsewhere after the paper web has been rolled up with the first job.
  • a precoat may be applied to the paper, paperboard or paperboard or previously applied, for example, by the papermaker, who, on the one hand, serves to remove the water from the coating. mass of the following barrier layers in it to penetrate into the paper, the cardboard or the cardboard and on the other hand smoothes the surface to be coated. Especially with paper that is very absorbent, such a precursor offers significant advantages.
  • the precoat also has properties that reduce the migration of aliphatic and aromatic hydrocarbons.
  • a precoat it is possible to apply masses used in the paper industry to improve the surfaces, in particular in order to reduce surface roughness, improve printability and machinability. So a mineral precoat, such as a carbonate precursor be used.
  • a primer may also be applied with a starch-based compound.
  • a starch-based pre-coat differs from the barrier layer according to the invention in that the pre-coat does not have all the features according to the invention of the barrier layer, ie, for example, has starch with a different molecular weight distribution and / or a different proportion than indicated in Table 1.
  • the preferred weight average molecular weight distribution M w of the starch used in the pre-coat in g / mol is> 500 ⁇ 00, preferably> 1 ⁇ 00 ⁇ 00, preferably> 2,000,000 preferably> 2,500,000, more preferably> 3 ⁇ 00 ⁇ 00, most preferably> 4 ⁇ 00 ⁇ 00 ,
  • solids content and plasticizer content of the precoat mass of dissolved starch what has already been mentioned in the sections "solids content of the coating composition" and "plasticizer” also applies.
  • the upper limit for the basis weight of the pre-coat in g / m 2 is 30, preferably 25, more preferably 20, most preferably 15.
  • the lower limit for the basis weight of the pre-coat is 1, preferably 2, more preferably 3, and most preferably at 5 g / m 2 .
  • One or more, preferably 2, 3 or 4 layers of the coating composition according to the invention, as explained in detail above, can then be applied to the precoat.
  • the speed with which the paper web to be coated is moved at the paper manufacturer is around 100-100 m / min for the heavier papers, which are preferred for use as a substrate for the barrier coating, which is a speed of 1.7 to 17 m / s. Most processes are in the range of 200 - 800 m / min. In the further processing of papers, such as, for example, in a coater, sometimes lower speeds are used.
  • the barrier coating according to the invention can be produced at industrial speeds in a continuous process.
  • the coating composition is applied to the paper at an elevated temperature.
  • the temperature in ° C. of the coating composition when applied to the paper is> 20, more preferably> 30, more preferably> 35, even more preferably> 40, most preferably> 45.
  • the upper limit of the application temperature is dependent, for example, on the composition of the coating composition, but results unambiguously for the person skilled in the art inter alia from the abovementioned requirements on the viscosity and thus the spreadability of the coating composition.
  • the coating composition is applied to a preheated paper, for example, the paper with infrared Spotlights can be heated. The heat from the paper can then also be used to heat the applied coating mass.
  • the paper is heated so that immediately before application of the coating, the side facing the coating has a temperature in ° C of> 30, more preferably> 40, more preferably> 50, even more preferably> 60, even more preferably> 70 , most preferably> 80.
  • the coated with the coating composition paper can be dried with the usual in the paper industry drying process.
  • infrared (IR) radiators and hot air hoods are used. It is customary that the side of the paper is treated with IR or hot air on which a layer to be dried has been applied. In a preferred embodiment, however, at least part of the drying process is carried out so that the other side of the paper is treated with IR or hot air (to which no layer to be dried has been applied).
  • both sides are treated simultaneously with IR or hot air.
  • FIG. 1 A generally common device for painting, in particular of paper and cardboards, as corresponds to the prior art, is shown schematically in FIG.
  • Essential components of such a device for coating a web 2 are the coating unit 4 and the subsequent drying device, usually consisting of an IR jet heater 8 and a hot air drying plant 9.
  • the web is guided by so-called guide rollers 3.
  • the web can from a roll 1 unwound and after drying again on such a 1 'on to be rolled.
  • painting for example, can also be an intermediate step in a multistage, continuous process.
  • the coating composition may e.g. by doctoring, blading, glazing, rolling, spraying, printing or other processes that are suitable for applying liquid masses are brought to the substrate surface.
  • a typical embodiment of a coating unit 4 is shown by way of example.
  • an applicator roll 5 which runs through a so-called swamp sump 6, the coating is applied to the paper.
  • a squeegee or a blade (blade) 7 the excess coating is stripped off.
  • the coated web 2 ' is passed over the drying 8, 9 and thereby dried so that it can be re-formed in a retractor to a paper roll V, without sticking.
  • the drying processes known in the paper industry are suitable, such as, for example, those based on infrared radiation and hot air or drying by means of hot rolls. Brief explanation of the figure:
  • Figure 1 shows schematically a coating system according to the prior art, as is customary in the finishing of paper.
  • a paper of known area is dried in a convection oven at 130 ° C for 15 minutes and then weighed. From the weight and the known area, the basis weight of the untreated paper in g / m 2 can be obtained.
  • a coated paper of known area is dried and weighed in the same manner and thus the grammage of the coated paper is in g / m 2 receive.
  • the basis weight of the coating in g / m 2 is obtained from the difference between the two basis weights.
  • M w is understood to mean the weight average molecular weight distribution.
  • the starch is in the form of a powder, the starch is suspended in water at a concentration of 3% dry matter. This suspension is then heated in a mini-autoclave with stirring up to 150 ° C and held there for 20 min. Subsequently, the solution thus obtained is cooled to about 60 ° C, diluted to 0.3% and filtered with a 0.005 mm membrane filter. The filtered solution is then measured by GPC-MALLS (gel permeation chromatography with multi-angle laser light scattering).
  • the starch in a barrier layer on a paper is to be analyzed for its molecular weight, the following two methods can be used to obtain the starch solution. 1) The starch is scraped off the paper with a scalpel or it is sanded with a fine sandpaper. The powdery material thus obtained can be converted in the same way into a solution as for the starch described above in powder form.
  • the barrier layer can be analyzed along with the paper.
  • the material is cut into pieces of about 2 * 2 mm, suspended in an autoclave and stirred overnight at room temperature. Then proceed as described above for powdered starch.
  • a coarse filter is first used to filter off the insoluble paper components. Since conventional papers can already contain starch even without a barrier layer, a reference measurement with the uncoated paper may be made, or a reference measurement with the paper from which the barrier layer has been mechanically removed. From the reference measurement it can then be assessed which stock share in the GPC-MALLS analysis of the barrier and which are attributable to the paper.
  • the mixture was cooked in a batch cooker with an anchor stirrer at 95 ° C for about 45 minutes, resulting in a clear, homogeneous solution with a solids content of 28.2%.
  • This solution had a viscosity of 370 mPas at 50 ° C.
  • Drying setting IR emitter (65%), dry air: 160 ° C (12 m drying distance)
  • the mixture was boiled in a batch cooker with an anchor stirrer at 95 ° C. for about 45 minutes to give a clear, homogeneous solution with a solids content of 27.0%.
  • This solution had a viscosity of 260 mPas at 50 ° C. 0.2% by weight of a commercial wetting agent was added to the mixture in order to obtain a stable curtain during curtain coating.
  • Dry coat weight 1 1 g / m 2
  • the mixture was boiled in a batch cooker with an anchor stirrer at 95 ° C. for about 45 minutes to give a clear, homogeneous solution with a solids content of 13.4%.
  • This solution had a viscosity of 600 mPas at 40 ° C.
  • Paper Commercially available carton box with 329 g / m 2 , with a coating according to Example 1
  • Dry coat weight 8 g / m 2
  • Drying setting IR emitter (80%), dry air: 260 ° C (12 m drying distance)
  • the mixture was cooked in a batch cooker with an anchor stirrer at 95 ° C for about 45 minutes, so that a clear, homogeneous solution with a solids content of 1 1, 3% was formed.
  • This solution had a viscosity of 320 mPas at 37 ° C.
  • To the mixture was added 0.2% by weight of a commercial wetting agent.
  • Dry coating weight 1 1, 7 g / m 2
  • Drying setting IR emitter (60%), dry air: 250 ° C (12 m drying distance)
  • the mixture was boiled in a batch cooker with an anchor stirrer at 95 ° C. for about 45 minutes, resulting in a clear, homogeneous solution with a solids content of 40.4%.
  • This solution had a viscosity of 1080 mPas at 43 ° C.
  • roller blade (20 mm smooth, contact pressure 0.8 bar)
  • Drying setting IR emitter (60%), dry air: 150 ° C (12 m drying distance)
  • Drying setting IR emitter (30%), dry air: 160 ° C (8 m drying distance)

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Wrappers (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne une matière de revêtement à base d'amidon destinée à des matériaux d'emballage, notamment du papier ou du carton, lequel amidon présente un poids moléculaire situé entre 800 000 et 50 000 000 g/mol, de préférence entre 800 000 et 20 000 000 g/mol. L'invention concerne également l'utilisation de la matière de revêtement pour sceller la surface de matériaux d'emballage afin d'empêcher le passage d'impuretés d'huile minérale du matériau d'emballage dans le produit emballé. L'invention concerne en outre un matériau d'emballage multicouche que l'on a produit en utilisant ladite matière de revêtement, ainsi qu'un procédé de fabrication correspondant.
EP14771294.7A 2013-09-18 2014-09-18 Matériaux d'emballage, avec un revêtement barrier à base d'amidon et revêtement masse et procede de production de celui Active EP3047068B1 (fr)

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CH16022013 2013-09-18
PCT/EP2014/069939 WO2015040134A1 (fr) 2013-09-18 2014-09-18 Matériau d'emballage comportant un revêtement barrière à base d'amidon, matière de revêtement et procédé de fabrication correspondant

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US9840811B2 (en) 2017-12-12

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