Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D2565/38—Packaging materials of special type or form
  • B65D2565/381—Details of packaging materials of special type or form
  • B65D2565/385—Details of packaging materials of special type or form especially suited for or with means facilitating recycling
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging

Definitions

• packaging When handling and transporting packaged goods, packaging is used that can ensure adequate protection of the packaged goods during transport and reloading; packs are also increasingly desired and used which are suitable for filling the packaged goods, in particular trickle goods, into the respective containers and processing vessels and in particular also for metering them.
• the packaging material usually consists of one or more envelopes, e.g. Paper, sacks, bags, boxes, cans or barrels, which after emptying can be a space-consuming material, which after careful emptying and, if necessary, cleaning, has to be destroyed in a complex manner or transported for disposal or returned.
• thermoplastic polyurethane-containing packaging material is used as the packaging material for the packaged goods, which is fully usable for further processing.
• the invention therefore relates to a packaging material made of thermoplastic packaging material, which is characterized in that the plastic from which the packaging material is made is such a polyurethane-containing material that the packaging material can be used to produce ready-to-use products containing polyurethane.
• Packaging shaped envelope that alone is sufficient to contain a certain amount of packaged goods.
• Packaging Packaging alone (if sufficient) or together with the necessary packaging aids.
• Packaged goods the entire contents of the packaging.
• Packing aids Packaging parts that are required in addition to the packaging material to complete or add to the packaging (for sealing, packaging, ready-to-dispatch goods, etc. ).
• Packaging material the material from which the packaging material and the packaging aids are made.
• a polyurethane-containing material (in relation to the thermoplastic packaging material) is understood here to be a polyurethane-containing material which has been processed to such an extent that a packaging material can be produced from it, but which in the form of packaging material is suitable as a starting material for further processing.
• Processing is generally understood here to mean any process by which the packaging material, if appropriate in the presence of further additives, is expediently processed in a suitable form, primarily as an at least partially softened, melted or dissolved processable mass, into finished products.
• Ready-to-use products include both polyurethane-containing preparations (e.g. adhesive preparations, preparations for the production of paints, inks and varnishes and for the production of coatings, films, foils and other products containing polyurethane), as well as the processing or further processing products intended for end use , for example the films, films, coatings, laminates, filaments, moldings etc.
• Suitable packaging materials for the packaging material are thermoplastic materials which essentially consist of any thermoplastic materials containing polyurethane, preferably those which are suitable for the production of films.
• the packaging materials can contain suitable additives (auxiliaries and / or by-products) in addition to the polyurethanes and, where appropriate, blending polymers, primarily UV absorbers, antistatic agents, plasticizers, Antioxidants, matting agents, dyes, antiblocking agents, lubricants or (for example if aqueous polyurethane dispersions were used for the production of the packaging material) optionally surface-active additives and / or also thickeners.
• the concentration of the additives in the polyurethane-containing packaging material can vary; it is advantageously up to 5% by weight, preferably 0.001 to 2% by weight, of the packaging material.
• Linear or almost linear polyurethanes which are only slightly or not crosslinked are advantageously used for the production of the films for the packaging material.
• the polyurethanes can be blended with other conventional polymers, primarily polyvinyl chlorides or polyacrylates.
• the polyurethane content in the packaging material is advantageously at least 50% by weight, preferably at least 80% by weight.
• Polyurethane is particularly advantageously used as the sole plastic in the packaging material. Any customary, essentially linear, polyurethanes can be considered, primarily those which result from the reaction of diisocyanates with isocyanate-reactive compounds, predominantly diols and, if appropriate, diamino compounds, and advantageously at least partially are hydroxy- and / or amino-terminated, preferably hydroxy-terminated.
• the polyurethanes are particularly preferably those which are suitable for producing adhesives based on polyurethane, in particular one-component adhesives based on polyurethane.
• Suitable diisocyanates are generally any diisocyanates customary for polyurethane production, preferably those having 2-15 carbon atoms in the hydrocarbon backbone, of which the following can be mentioned: polymethylene diisocyanates with 2-6 methylene groups, trimethylhexylene-1,6-diisocyanate (in particular 2,2,4-trimethylhexylene-1,6-diisocyanate or 2,4,4-trimethylhexylene-l, 6-diisocyanate), 5-meth ll, -diisocyanatononane, 2-methyl-l, 5th diisocyanatopentane, 2-ethyl-l, 4-diisocyanatobutane and mono- or dicyclic diisocyanates, primarily 2,4- or 2,6-tolylene diisocyan
• the diols for the production of polyurethane are preferably at least partially.
• Macrodiols primarily those with an average molecular weight (weight average) in the range of 400-600, preferably 500-500, advantageously at least some of the macrodiols. has an average molecular weight in the range of 800-4O00- *.
• the macrodiols can be polyester-based, and polyether-based dnt can also be combined.
• Polyalkylene glycols with 2-6 carbon atoms in the alkylene radical among which polypropylene glycols and polybutylene glycols or mixed polypropylene and butylene glycols are preferred.
• the polybutylene glycols are primarily those which contain oxygen-bonded butylene-1,2-, butylene-2,3- or butylene-1,4-groups (the latter are also known under the name polytetrahydrofurans).
• Polyethylene glycols, polypropylene glycols and polybutylene glycols or corresponding mixed polyether diols are primarily adducts of the corresponding oxides (ethylene oxide, propylene oxide, butylene oxide and / or tetrahydrofuran) with water or starting diols, which contain in particular 2-6 carbon atoms, for example Ethylene glycol, propylene glycol, butylene glycol or hexamethylene diol.
• Polypropylene glycols are preferred.
• Polyester diols primarily obtainable by reacting alkanediols with 2-6 carbon atoms, preferably ethylene glycol, 1,3-propanediol, 1,4-butanediol, neopentyl glycol or 1,6-hexanediol, with corresponding aliphatic or aromatic dicarboxylic acids, advantageously with a total of 4 -8 carbon atoms, preferably maleic acid, succinic acid, sebacic acid, adipic acid or phthalic acid (of which adipic acid is preferred) - or with corresponding functional derivatives thereof, for example the anhydride - or by reacting caprolactone with a corresponding starting diol or water, preferably H 2 0 or an alkanediol as mentioned above, to hydroxy-terminated polycaprolactones.
• alkanediols with 2-6 carbon atoms, preferably ethylene glycol, 1,3-propanediol,
• difunctional compounds can also be used - for example as chain extenders - primarily simple alkanediols, as mentioned above, or di- or triethylene glycol, hydrazine or aliphatic diamines with 2-9 carbon atoms, preferably propylenediamine and isophoronediamine or else ⁇ , ⁇ Dimethylolalkane carboxylic acids, advantageously dirnethylolacetic acid, which is further unsubstituted at the ⁇ -carbon atom or carries a C 1 _ 4 -alkyl radical (preferably dimethylolpropionic acid and dimethylolacetic acid), or also in small amounts, for example 0.1 to 5 mol% of the diols present, Highly functional compounds such as trimethylolpropane, glycerin or sorbitol.
• chain extenders primarily simple alkanediols, as mentioned above, or di- or triethylene glycol, hydrazine or aliphatic diamines with 2-9
• the equivalence ratio of the diisocyanates to the isocyanate-reactive compounds is expediently chosen so that a sufficiently high molecular weight, molecular, stable, thermoplastic polyurethane is formed, from which a film suitable for a packaging material can be produced. 0.85-1.10 per val of isocyanate-reactive compound is advantageous. preferably 0.90-1.05, in particular 0.99-1.01 val diisocyanate used.
• the polyaddition of the diisocyanates with the isocyanate-reactive compounds can take place in a manner known per se, in particular in the presence or absence of solvents (for example in the presence of dialkyl ketones, preferably methyl ethyl ketone, acetone or cyclohexane, of dirnethylolformamide, of N-methylpyrrolidone, of tetrahydrofuran or of aliphatic Carbonklaestern, for example ethyl acetate or acetic klathoxyäthylester optionally stuffs with aromatic Amsterdamsmit ⁇ , preferably toluene or xylene may be blended) and advantageously in the temperature range from 40 ° C to the reflux temperature of the solvent, preferably 40 to 90 ⁇ C if polyaddition is carried out in the presence of solvents, or up to 250 ⁇ C if polyaddition is carried out in the absence of solvents, in particular in the melt, and if desired in the presence of solvent
• the procedure is preferably in the absence of any solvents and catalysts, wherein the Tempe ⁇ temperature advantageously in the range of 50-250 ⁇ C, in particular 70-200 ° C is ten gehals ⁇ .
• carboxy groups are present in the polyurethane, they are advantageously at least partially converted into a salt form before any chain extension.
• Suitable, in particular monovalent cations, especially alkali metal or ammonium cations [for example lithium, sodium, potassium or tri (C 1 -C 4 -alkyl) ammonium] are suitable for salt formation.
• Any chain extension of carboxy-containing polyurethanes with diamino compounds can advantageously also be carried out in an aqueous medium.
• thermoplastic polyurethane-containing packaging materials can be processed into packaging materials in a manner known per se, expediently as a processable, at least partially softened mass, in the melt (whereby the term melt here means any viscous to liquid state within and / or above the melting range).
• melt means any viscous to liquid state within and / or above the melting range.
• aqueous dispersion in organic solution or in aqueous dispersion.
• customary, easily evaporable organic solvents for the plastic solutions Solvents are used, for example the above.
• Aqueous dispersions are primarily suitable for polymers which are self-dispersible in water, for example for polymers containing sulfo or carboxy groups (in particular polyurethanes) in which the sulfo or carboxy groups are at least partially in salt form.
• thermoplastic materials that are not self-dispersible in water can be dispersed in water in a suitable manner, preferably with the aid of conventional surface-active compounds, in particular dispersants, if surface-active additives are used for the further use of the packaging material are desired or can be tolerated.
• Suitable surface-active compounds are, in particular, emulsifiers with an oil-in-water emulsifier character, preferably hydrophilic surfactants, optionally also those with a protective colloid character.
• the surfactants mentioned are e.g. present in amounts of 0.01 to 5, preferably 0.1 to 2,% by weight, based on the polymers.
• thermoplastic polyurethane-containing packaging materials are expediently processed in a workable, primarily flowable form, for example as an at least partially softened, melted or dissolved mass or as a dispersion for the desired casing shape - favorably as a film or tube.
• a workable, primarily flowable form for example as an at least partially softened, melted or dissolved mass or as a dispersion for the desired casing shape - favorably as a film or tube.
• a suitable base e.g. sheet metal or transfer paper
• extruding e.g. by round or slot die, in particular by blow molding
• films or tubes which can then be cut into appropriate containers (sacks, bags) and sealed (welded or glued).
• the evaporated solvent can be collected and distilled for reuse and optionally cleaned. Suitable evaporation temperatures are in the range of 40-90 ° C, preferably 50-80 ° C. If aqueous plastic dispersions are used, drying is advantageously carried out at temperatures in the range from 70 to 98 ° C.
• concentrations of the solutions and dispersions mentioned are expediently based on the appropriate manufacturing system, in particular adapted to the suitable viscosities.
• Suitable concentrations are, for example, in the range of 10-75 wt., Preferably 15-50 wt., Solids content, and viscosity is advantageously below 20 mPas at 150O00 ⁇ C., preferably in the range of 3,000 to 50,000 mPas at 20 ° C.
• the predominantly at least partially softened or melted thermoplastics at temperatures in the melting range advantageously with an L / D ratio of the extruder screw of at least 10 D, extruded: in particular extruded into tubes (preferably blow-molded) and, for example, cut and welded or glued directly into sacks or bags, or cut into open foils or extruded directly into foils by means of slot dies and then processed into any suitable shape .
• the thermoplastics can also be used in the melting range as for extrusion.
• essentially solutions and dispersions as well as the melt above the dropping point come into consideration.
• the tubes or films can, if desired, be stretched mono- or biaxially.
• Aqueous dispersions can also be used for coating and calendering if they are sufficiently thick; if necessary, they can be mixed with suitable conventional polyurethane thickeners, for example with hydroxyethyl cellulose or with (meth) acrylic acid / (meth) acrylic ester copolymers - the latter under alkaline pH conditions -; ammonia can occasionally be used as a thickener.
• packaged goods can also be produced, if necessary with the addition of further additives, if it is to contain such thermoplastic materials, for example by Crushing the dried products, by spray drying or by suitable shaping.
• further additives for example further compatible plastics, by-products and / or auxiliaries, as mentioned above, can be added to the melts, solutions or dispersions mentioned.
• the thickness of the foils used for the casing is advantageously chosen according to the size and weight of the pack and is advantageously in the range from 0.01-2.5 mm, preferably in the range from 0.02-1.8 mm.
• polyurethane-containing thermoplastic packaging material is also used for any packaging aids, which is preferably compatible with the packaging material and which can also be processed, in particular together with the packaging material.
• packaging aids which is preferably compatible with the packaging material and which can also be processed, in particular together with the packaging material.
• the entire packaging packaging and any packaging aids that may be present
• the packaged goods can also be processed together with the packaging and, if appropriate, the packaging aid.
• Any material can be considered as packaged goods, such as those which are usually packed in plastic film or which can be packed in plastic film, for example agricultural goods, in particular cattle feed and fertilizers, construction, packaging and other bulk or piece goods , primarily textile material, textiles, paper, sand, cement and plaster and series of other small packs wholesale, or preferably materials that can be processed in solution or in the melt separately or preferably together with the packaging material and can in particular thermoplastic or not be thermoplastic plastics.
• plastics which are readily soluble in common solvents (for example those mentioned below) or which are optionally meltable together with the packaging material under customary processing temperatures, for example cellulose acetate, polyamides (primarily polyamide 6, polyamide 66, polyamide 11 and Qiana), polyester (e.g.
• polyethylene terephthalate or similar fibrous dende polyesters polyacrylonitrile
• poly (meth) acrylates for example those in which the ester-forming alkyl radicals contain 1-4 carbon atoms and some can also be longer-chain alkyl radicals, for example with 5-22, in particular 12-18, carbon atoms in the alkyl radical
• epoxy resins Polyvi ⁇ nyl chloride, polyvinyl alcohol and / or acetate, polyurethanes, polyenes (for example addition polymers made from styrene, ethylene, propylene and / or butadiene), polyethers and mixed polymers and copolymers which contain parts of the plastics mentioned, or natural and synthetic rubbers (Rubber or polychloroprene) and casein.
• By-products and auxiliaries that come into question as packaged goods are essentially solid substances that can be used, for example, as an admixture in the processing of plastics, primarily dyes (pigments, solvent dyes), fillers, antiblocking agents , Lubricants, flow improvers, pouring aids and matting agents (clays, e.g. kaolin or montmorillonite; chalk; heavy spar; quartz sand, silica; titanium dioxide; waxes, e.g. synthetic hydrocarbon waxes and ester waxes), UV absorbers, antioxidants, antistatic agents and plasticizers ( Plasticizer).
• dyes pigments
• solvent dyes fillers
• antiblocking agents e.g. kaolin or montmorillonite
• chalk e.g. kaolin or montmorillonite
• chalk e.g. kaolin or montmorillonite
• quartz sand silica
• titanium dioxide e.g. synthetic hydrocarbon waxes and ester waxes
• auxiliaries and by-products mentioned can be incorporated in high concentration (“master batch”) for metering purposes in corresponding plastics and can also be used in this form as packaged goods.
• concentration of auxiliary and by-product in the master batch is generally in the usual range; Depending on the type of auxiliary or by-product and the plastic and the desired use product, it can be different and is usually in the range of 10-90 Gev.X of the master batch.
• Conventional adhesive raw materials are used particularly advantageously as packaged goods, in particular polychloroprene, PVC and PVC copolymers, and preferably polyurethanes.
• the packaged goods can generally be in any customary form, for example in the form of a mass of pasty or waxy consistency or preferably in free-flowing form, for example in the form of powder, chips, flakes, chips or chips or in another form generated form (eg beads, rods, granules, grains, platelets, lenses or rings).
• any customary form for example in the form of a mass of pasty or waxy consistency or preferably in free-flowing form, for example in the form of powder, chips, flakes, chips or chips or in another form generated form (eg beads, rods, granules, grains, platelets, lenses or rings).
• the prepared casings can be filled with the packaged goods in the usual way and closed after filling, primarily by welding (if necessary with vacuum and / or shrinking of the stretched packaging material, for example with microwaves or hot air), gluing, binding or sewing.
• the sacks or bags are provided with a (self) closable filling opening, for which purpose the foils or hoses are advantageously processed into glued or welded valve sacks prior to filling.
• the envelopes (sacks or bags) are provided with an opening device.
• opening systems can advantageously be attached that do not involve any loss of material, e.g. Tear strips or corners (for example by attaching a perforation or a prefabricated predetermined breaking point).
• the packs according to the invention can be numbered or otherwise marked without the use of foreign material, for example by attaching a stamped or perforated, possibly computer-readable label to a tab or tongue, which is preferably part of the . Tear device (e.g. the tear strip).
• the packs according to the invention in particular produced as described, can be stacked and transported in a simple manner, for example on pallets or in transport containers.
• each pack can now be opened in the simplest way, the packaged goods can be placed in the container and the packaging (packaging and, if appropriate, packaging aids) can be collected, if necessary, weighed and further processed for their intended purpose are, for example in a separate processing container or, according to a special embodiment, even - if the packaged goods are compatible with them - together with the packaged goods.
• the packaging or packaging melts or dissolves in the container under the selected processing conditions.
• packaging material and packaged goods are processed together, a very careful emptying of the last parts of the packaged goods (eg the Riesel good) from the envelope is not absolutely necessary, since these come into the container with the envelope.
• a marked tab or tongue can also be added to the processing vessel after tearing off and registering or checking the batch name.
• the packaging or the packaging can be divided into smaller parts before being added to the vessel, for example by punching or in a cutting mill.
• the casing can be melted or dissolved in a separate vessel, in order then to mix the solution or melt obtained with the packaged goods which may have been dissolved, dispersed or melted.
• the packs according to the invention are particularly advantageously produced in dosage sizes (for example 5 to 40 kg, in particular 10 to 30 kg) and can be slit open for emptying, for example on a mandrel, or they can be whole as a whole, even without being opened (Packaged goods together with packaging or packaging) are placed directly in the container in which packaging or packaging is dissolved or melted, the packaged goods being distributed in bulk (dissolved, melted and / or dispersed, depending on their type and process conditions) becomes what is particularly advantageous, for example for dusting contents.
• the stirring speed is advantageously in the range from 400 to 4000 rpm, advantageously 600 to 3500 rpm;
• Unopened metering packs can also be torn open by the high shear forces of the liquid or by the stirrer itself.
• Empty packaging materials are used for Solution or for melting, advantageously not all of them in the processing vessel at once, in order to avoid as far as possible clumping of casings which were not dissolved quickly enough.
• the containers for processing the packaging material and the packaged goods can be loaded in a very simple manner and with very good and simple dosing of the material using the packaging materials or packaging according to the invention or by the method according to the invention, with almost no packaging waste or no packaging waste at all arises or no bulky empty containers (such as drums, cans, boxes) have to be stored and / or transported, and when using dosage packs that are not opened, there is significantly less material loss (such as spilling or dusting) and annoying dusting is largely avoided can be.
• the packaging materials or packagings according to the invention or in particular packs can be used for any desired processing of polyurethane-containing thermoplastic material - in particular as at least partially softened, melted or dissolved mass - for corresponding products, for example for plastic preparations in liquid , semi-liquid or solid form, which can be used for any usual purposes (e.g. as adhesives, as coating preparations, as components of inks, varnishes or paints or for the production of films, foils, filaments, moldings or laminates, depending on Art the thermoplastic components) and also directly to products in solid form (for example the films, foils, filaments, moldings or laminates mentioned above).
• adhesives e.g. as adhesives, as coating preparations, as components of inks, varnishes or paints or for the production of films, foils, filaments, moldings or laminates, depending on Art the thermoplastic components
• films, foils, filaments, moldings or laminates mentioned above for example the films, foils, filaments, moldings or laminates mentioned above
• the polyurethane from which the packaging is made being particularly preferably a polyurethane for the production of polyurethane-based adhesives, in particular one-component polyurethane-based adhesives.
• the adhesive preparations are particularly advantageously solvent-containing - the solvents preferably being those as stated above.
• the packaging materials occurring in companies that are not equipped for processing plastics - for example in agricultural companies, construction, paper processing, textile manufacturing or sales companies, etc. - can be collected and used for further processing, for example Adhesive manufacturers are given for the production of adhesive, which can be particularly advantageous for businesses in which large amounts of packaging material are produced - for example for agricultural businesses and cooperatives.
• the reaction mixture is then heated at 100-120 ° C for 4-6 hours. Thereafter, the polyurethane melt to Kunststofftem ⁇ temperature is cooled (20 ⁇ C). The cold polyurethane is ground using a cutting mill (with a hole diameter of 8-15 mm in the sieve).
• Polyetherdiol based on 67.59 4,4'-diphenylmethane 310.94 polytetramethylene glycol diisocyanate molecular weight: 2000
• a 30% solution in methyl ethyl ketone is prepared from the resulting polyurethane chips from Examples 1-4.
• the viscosity of this solution is 30,000 mPas at 20 ° C.
• the polyurethane chips from Examples 5-8 are dissolved in a solvent mixture of 40 parts of dimethylformamide and 60 parts of methyl ethyl ketone up to a concentration of 30%; the viscosity of the 30X solutions is also 30,000 mPas / 20 ° C.
• the products of Examples 9 and 10 are dissolved in a concentration of 30% in dimethylformamide (Example 9) and N-methyl pyrrolidone (Example 10).
• polyurethanes mentioned in Examples 1-10 can also be prepared in a reactor in the presence of the solvents mentioned, the reaction being carried out as follows:
• 1000.00 parts of the dewatered macrodiol are placed in a reactor with a stirrer and an inert atmosphere (nitrogen).
• the macrodiol is heated to 60 ° C.
• x parts of 1,4-butanediol are added and homogeneously mixed with 20% of the solvent with the macrodiol with stirring.
• y parts of diisocyanate are added to the dissolved diol mixture while stirring. Due to the exothermic nature of the polyaddition reaction, the temperature rises to 70 ° C. As the viscosity of the solution increases, the remaining solvent is added. The reaction is complete when no more diisocyanate can be detected.
• the polyurethane solutions obtained can be used directly for the production of films.
• the products of Examples 1-10 are melted in an extruder with an L / D ratio of 20 D, the melting temperature being between 100 ° C. and 220 ° C., depending on the polyurethane used.
• the polyurethanes melted in this way are extruded through a slot die of 100 ⁇ m x 2ra and immediately cooled. According to a modified procedure, the melted polyurethanes are shaped into endless tubes in a blow molding nozzle.
• the 0.1 mm thick polyurethane foils are welded into sacks in a vertical tubular bag machine and are shredded with similar types of polyurethane, which are added and shredded according to the same method as mentioned above for the respective foil, filled and welded. In this way, packs of 25 kg total weight are produced, in which the casing and the contents each consist of the same polyurethane.
• a finely divided dispersion is obtained.
• a low-viscosity dispersion with a solids content of 40% is obtained.
• the dispersion is adjusted with ammonia to pH 8, and with a thickening agent ( "Collacral VL" from BASF - a thickener based on polyacrylate.) Is set to a spreadable viscosity of 4000 mPas at 20 ⁇ C and applied with a doctor blade to a slightly siliconized transfer paper .
• a thickening agent "Collacral VL" from BASF - a thickener based on polyacrylate.) Is set to a spreadable viscosity of 4000 mPas at 20 ⁇ C and applied with a doctor blade to a slightly siliconized transfer paper .
• the film obtained in this way is processed further into a sack in the same way as in Packing Examples 1-10 and filled with the same polyurethane.
• polyurethane packs according to pack example 9 instead of the polyurethane packs according to pack example 9, polyurethane packs according to pack example 8 or 10 are used.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wrappers (AREA)
• Polyurethanes Or Polyureas (AREA)
• Packages (AREA)
• Adhesives Or Adhesive Processes (AREA)

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• 1987
  • 1987-10-08 DE DE19873734061 patent/DE3734061A1/de not_active Withdrawn
• 1988
  • 1988-10-05 EP EP19880810685 patent/EP0311571A1/de active Pending
  • 1988-10-05 WO PCT/CH1988/000178 patent/WO1989003352A1/de not_active Application Discontinuation
  • 1988-10-05 EP EP88908129A patent/EP0340254A1/de not_active Withdrawn
  • 1988-10-05 JP JP63507537A patent/JPH02501487A/ja active Pending
  • 1988-10-06 PT PT8868388A patent/PT88683A/pt not_active Application Discontinuation

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