Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
  • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
  • C08B30/18—Dextrin, e.g. yellow canari, white dextrin, amylodextrin or maltodextrin; Methods of depolymerisation, e.g. by irradiation or mechanically
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D103/00—Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
  • C09D103/02—Starch; Degradation products thereof, e.g. dextrin
• • 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
  • C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
  • C09J103/02—Starch; Degradation products thereof, e.g. dextrin
• • 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
• • 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
  • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
  • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
• • 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
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• • 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
  • D21H21/16—Sizing or water-repelling agents
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3927—Including a paper or wood pulp layer
  • Y10T442/3959—Including an outermost adhesive layer

Definitions

• the present invention relates to a new method of treatment for finishing a fibrous web using an adhesive composition based on polymer (s), presented and applied optionally diluted, in aqueous form or in solvent medium, containing a particular combination of different saccharides, said combination comprising monosaccharide (s), disaccharide (s), oligosaccharides and / or polysaccharide (s), preferably hydrogenated.
• finishing treatment process within the meaning of the invention means any process allowing the application of a uniform and perfectly regular layer of material, taken homogeneously in an adhesive composition, on a fibrous sheet.
• Said fibrous sheet can result from any process allowing its formation in an aqueous medium. It is then commonly designated under the terms of paper, of flat cardboard, in particular when the web is mainly composed of cellulosic fibers, or under the terms of non-woven veil, or else of mattress, in the opposite case.
• Said fibrous sheet can also be obtained by any process allowing the entanglement of the fibers without the assistance of water.
• These are then “nonwoven plies” in the most widespread sense, in particular produced by mechanical or electromechanical means, for example.
• water-soluble polymers generally means the various adhesive materials which are soluble in the particular solvent that constitutes water. These polymers are commonly used in industry. They are, in particular, very widespread in the paper industry, in the context of finishing treatments such as surfacing, pigmented surfacing, or coating.
• organic macromolecular systems of natural origin such as, for example, casein, gelatin, alginates, various vegetable proteins, certain cellulose derivatives, starch and its derivatives.
• certain gums for example, guar gum, or of synthetic origin such as polyvinyl alcohols.
• aqueous solutions of these adhesives also suffer from rheological behavior which is sometimes poorly dominated, difficult to reconcile with the requirements of storage, processing and use. They have, in fact, very often a more or less pronounced tendency to thicken over time and / or at rest, or a more or less marked propensity for appreciable variations in viscosity due to their sensitivity to shearing or by thixotropy.
• prepolymerates within the meaning of the invention is meant all of the adhesives for which it can be considered that they are constituted by systems capable of undergoing polymerization and / or crosslinking, an operation which authorizes the use of polymers with low molecular weights.
• This class which includes, for example, formulated resins, of the resorcin-formaldehyde type, urea-formaldehyde, phenol-formaldehyde, certain rubbers, natural or synthetic, epoxy resins, but also various preparations containing polymerizable carboxylic acids, such as Sorbic, crotonic and / or fumaric acids, for example, have an obvious advantage of easy implementation at low viscosities.
• adhesive compositions for example mixtures of formaldehyde resin (s) and starch (s), or even for example combinations of latex, styrene-butadiene and starch.
• starchy materials In general, starchy materials, modified or unmodified starches, constitute an important source of adhesive substances, for the most part soluble in water after they have undergone a heating or "cooking" stage, easy to supply, and relatively inexpensive.
• adhesives based on starchy materials are very commonly used, in various forms, in adhesive compositions, and constitute all, essential or part of the adhesive polymer element of said adhesive compositions useful for the treatment intended for the paper refinement, in particular, during operations known to those skilled in the art under the usual names of surfacing, pigmented surfacing or coating.
• starch constitutes the main surfacing agent or pigmented surfacing, provided that it has, in aqueous solution, reduced viscosity. It is also, in a wider range of viscosities and molecular weights, an agent widely participating in the development of coating formulas.
• the 1967 edition of "Starch: Chemistry and Technology - Volume II - Industrial Aspects” (RL histler - Académie Press) sheds light on the practice, in particular on pages 130 to 143.
• compositions according to the invention faithful to these fundamental options reported in the cited documents, will thus make extensive use of oxidized starches, dextrins, starches derived from acid hydrolysis, and / or etherified or esterified, and / or starches having undergone thermochemical or enzymatic conversion, continuous or discontinuous.
• thermochemical and enzymatic conversions practiced with the machines which use them, occupy today a place of choice in the paper industry, in particular by the possibilities which they offer in the levels of transformation, as well as by their driving flexibility linked to quick and easy changes to parameters on suitable and reliable equipment.
• French patent FR 2,149,640 for example, filed in the name of the Applicant, provides, in the field of enzymatic transformation of starch, sophisticated means of practice for high dry matter, in particular by providing granular starch, possibly moistened, continuously, directly in the reaction vessel.
• Said adhesive compositions can also comprise, for example, anti-foaming agents, optical brighteners, or slip-improving agents, lubricants, dyes or the like.
• plasticizing agents such as, for example, sodium nitrate, urea,. dicyandiamide, glycerin, sorbitol,
• - stabilizing agents such as fatty additives of the stearate type
• agents increasing the viscosity of starch jobs such as, for example, borax, sodium metaborate, sodium aluminate, alumina sulphate,
• swelling retarding agents such as for example sodium sulfate and sodium citrate
• - fluidifying agents for starchy powders such as, for example, colloidal silica.
• US Patent 4,155,884 provides an appropriate, continuous embodiment of a composition consisting essentially of a starch solution.
• the said preparation can advantageously be brought into the presence of an alcohol, preferably methanol, ethanol, n-propanol, x-hexanol, ethylene, propylene and hexylene glycols, glycerin, it cannot be consider it this is an adhesive composition as contemplated by the present invention insofar as, at the same time as the use of a polyhydric alcohol, a polybasic acid, or anhydride, is added for manufacturing purposes polyester.
• Japanese patent JP 6136168 again, relates to a process for the manufacture of starchy foams which consists, in addition to the fact of the existence of an expansion phase, in particular in the presence of a volatile solvent, of subjecting a starchy substance to a liquefaction operation by the action of temperature in the presence of a acid catalyst, either a mineral, organic acid or a Lewis acid, and a polyol chosen from aliphatic polyalcohols, polyethers or polyesters of polyols.
• a acid catalyst either a mineral, organic acid or a Lewis acid
• the preparations for pigmented surfacings as well as the preparations necessary for a light coating can contain, together with the more or less optional use of dispersants usual such as the sodium salts of phosphoric acid and silica, proteinates, surfactants such as for example alkyl or alkylaryl sulfonic derivatives, various fillers known to those skilled in the art for their more or less common, such as calcium carbonate, kaolin, talc, satin white, titanium oxide, silicas, natural, calcined or synthetic, various bentonites, or others less widespread like sulphate, sulphite or calcium silicate, barium sulfate, alumina hydrate, zeolites, zinc oxide or sulfide, or even organic fillers like polystyrene or polymethylene urea.
• dispersants usual such as the sodium salts of phosphoric acid and silica, proteinates, surfactants such as for example alkyl or alkylaryl sulfonic derivatives
• saccharides are meant, within the meaning of the present invention, in particular starch hydrolysates and other polysaccharides, optionally partially or totally hydrogenated having a defined carbohydrate profile, which characterize them and distinguish them from one another with all the necessary precision, characters and distinctions being likely to be related to more or less specific effects on the properties of the paper.
• these combinations of saccharides can be created "from scratch" by the appropriate mixture of two or more saccharide compositions, said mixture having the defined carbohydrate profile.
• the object of the invention is in particular to provide preparers of solutions / dispersions intended for paper finishing, or to paper manufacturers themselves, directly interested in the preparation, in the processing and / or in the use of these solutions / dispersions, as well as by the properties conferred on flat paper or board, combinations of saccharides, in particular starch hydrolysates, optionally hydrogenated, partially or totally, which may have a set of properties of interest in such applications.
• the Applicant company had in particular the merit of determining that the combinations of saccharides, possibly hydrogenated, partially or totally, responding to the desired properties, should be neither too rich in high molecular weight polysaccharides, nor too rich in low molecular weight saccharides, in particular, in mono- or disaccharides.
• a combination rich in low molecular weight saccharides essentially fulfills a role similar to that of sorbitol, that is to say that mainly of plasticizing agent. Consequently, the combinations of saccharides, optionally hydrogenated, partially or totally, used in accordance with the invention are characterized by a relatively high content of oligosaccharides simultaneously with a relatively low content of low molecular weight saccharides and of polysaccharides.
• the abovementioned combinations of polysaccharides have a high content of oligosaccharides of DP (degree of polymerization) 3 to DP 9, and a relatively small amount of mono- and disaccharides, as well as in polysaccharides of DP at least equal to 10.
• This content of polysaccharides with DP greater than 10 is, in particular, sufficiently low so that the saccharide combinations according to the invention can be distinguished without any ambiguity from any starchy composition commonly used in the paper industry, in particular in the operations of refinement, and obtained by any conventional means such as acid hydrolysis or enzymatic or thermochemical transformations.
• starchy compositions known to a person skilled in the art and commonly used are in fact notoriously different in their nature, since they have average molecular weights more often than 100,000 daltons.
• the hydrogenation of such weakly hydrolyzed compositions does not have much significance, moreover.
• the combinations of saccharides used in accordance with the invention are characterized by a content of polysaccharides of DP at least equal to 10 at most equal to 70% by weight, relative to the dry matter of said combinations. This polysaccharide content is more advantageously between 25 and 70%, preferably between 25 and 65% (dry / dry).
• the combinations of saccharides used have an oligosaccharide content of DP 3 to DP 9 of between 30 and 70%, preferably between 35 and 60%, based on the total dry saccharide combination.
• the Applicant Company had the merit of finding that, for this particular application aimed at paper finishing treatments, there is an essential advantage of using combinations of saccharides with a high, even very high, content of DP 3 to DP 9.
• very particular importance should be attached to the fraction corresponding to the oligosaccharides from DP 5 to DP 7, determining that it is entirely advantageous that this represents at least 10% of the total of the combination dry saccharides. More preferably, this oligosaccharide content from DP 5 to DP 7 is between 10 and 35%.
• combinations of saccharides, or starch hydrolysates which are particularly satisfactory in the practice of the invention, can be obtained by an acid or enzymatic liquefaction of a starch, leading to a DE (Dextrose Equivalent) approximately 30, followed by exclusion, by molecular sieving, of a significant fraction of the products with high PD and / or another significant fraction of the products with PD less than 3.
• DE Dextrose Equivalent
• starches modified or not, from all sources, such as potato starches, potato rich in amylopectin, cassava, corn, waxy corn, wheat, rice, peas, can be used.
• said sieved hydrolysis product in whole or in part, is subjected to conventional hydrogenation, in particular by the Raney nickel method.
• a high content of low molecular weight saccharides has been found to be harmful in this respect, while at the same time being beneficial to the stability of compositions and with a plasticizing effect.
• the ability, in terms of plasticizing properties, exhibited by such combinations rich in saccharides of low molecular weight is known but cannot constitute, as such and in itself, the object of the invention, while being likely to participate.
• the combinations of saccharides which can be used in accordance with the invention have a content of monosaccharides and disaccharides, that is to say products with a degree of polymerization equal to 1 and 2, less than or equal to 30%.
• this overall content of monosaccharides and disaccharides is at most equal to 28%, preferably between 0.5 and 28%. These percentages are related to the combination of saccharides, total, dry.
• the combinations of saccharides in accordance with the invention which best meet the objectives set, have a carbohydrate spectrum defined by contents: in monosaccharides and disaccharides less than or equal to 30%, preferably less than 28% , more preferably still between 0.5 and 28%, in oligosaccharides of DP 3 to DP 9 greater than or equal to 30%, preferably between 30 and 70%, more preferably still between 35 and 60%, in polysaccharides of DP at least equal to 10 less than 70%, preferably between 25 and 70%, and more preferably still between 25 and 65%, said contents being expressed by weight for weight relative to the dry matter of said combinations.
• combinations of saccharides, optionally hydrogenated, used in accordance with the invention can be presented in the form of syrups sufficiently concentrated to avoid any bacterial development, to display an adapted and stable viscosity to respond comfortably to any constraint of feeding, storage or circulation.
• said combinations could also, possibly, be added in intermediate stages facilitating or simplifying the various manipulations, in the addition of enzyme, possibly diluted, or be introduced at any stage whatsoever of enzymatic transformation, whether continuous or discontinuous.
• the combinations of saccharides which can be used in accordance with the invention can also be presented in the form of powders, these having flow characteristics, such that they can be introduced indifferently into the composition of soluble polymers, or be dispersible in the 'One of these polymers only, whether in the form of a solution, a dispersion, or even a powder.
• the combinations of saccharides used in accordance with the invention are capable of being introduced in all proportions into the adhesive compositions according to the invention.
• an extreme proposal may consist of a paper finishing treatment consisting almost exclusively of the combination of saccharides according to the invention. This possibility can be exploited, for example, in the context of application conditions for which the importance of the viscosity is entirely minor and / or the visual factor is itself secondary, as in the case of a treatment. of recycled fibers.
• the combinations of saccharides according to the invention are capable of intervening in any finishing treatment, in particular, relatively poorly developed treatments, such as starch surfacing, starch surfacing enriched with any resin, dispersion or solution, capable of imparting one or more particular properties such as resistance to water, to fats, or “barrier” capacity to oxygen.
• relatively poorly developed treatments such as starch surfacing, starch surfacing enriched with any resin, dispersion or solution, capable of imparting one or more particular properties such as resistance to water, to fats, or “barrier” capacity to oxygen.
• the combinations of saccharides used according to the invention are capable of also participating in more noble treatments where, obviously, their contribution will appear significantly more reduced, such as, for example in the context of a pigmented surfacing or even a sleeping, depending on the circumstances.
• the amount of combination of saccharides, possibly partially or totally hydrogenated, which is introduced into the adhesive composition can be extremely variable, and can in fact be understood between 0.01 and 100% (dry / dry).
• the adhesive composition itself exhibits, quite advantageously, an oligosaccharide content of DP 3 to DP 9 of between 0.03% and 14% (dry / dry).
• the introduction rate is, in general, more particularly between 0.1 and 20%, and preferably between 0.2 and 5%, these percentages being counted as dry matter and reported to the total dry composition.
• the enzymatic conversion of a native wheat starch is carried out continuously by preparing a milk with 39% dry matter, to which an enzyme, BAN 240, sold by the company NOVO, is added at the rate of 0 0.05% compared to commercial starch.
• the continuous enzymatic conversion installation is adjusted in such a way that the temperature to which the product to be converted is subjected is maintained at 85 ° C. for 10 minutes, and that the enzyme can then be perfectly deactivated by maintaining glue at 130 ° C, for 1 minute and 30 seconds.
• the glue is then reduced to 20% dry matter.
• C 1 a combination of saccharides, called C 1, in accordance with the invention, consisting of a hydrogenated starch hydrolyzate, having 70% dry matter and corresponding to the following analysis related to dry matter:
• control 1 taken before adding sorbitol or hydrogenated hydrolyzate, as well as with a second adhesive
• the saccharide combinations selected according to the invention reinforce the stability of the adhesive on cooling.
• Example 1 The resumption of the operating conditions of Example 1 thus leads to making a mixture between enzyme BAN 240 and hydrogenated starch hydrolyzate, capable of being used directly for the conversion, and containing 0.62% of the enzyme.
• Each of the preparations concerned is stored under standardized conditions, ie at 25 ° C., and for periods considered significant, which are arbitrarily fixed at four days or two months, respectively. At the end of these periods, the activity of the enzyme is monitored. It is thus noted, knowing that the enzymatic activity of pure BAN 240 is 204 KNU / g:
• a new enzymatic conversion of a native wheat starch is carried out, continuously, under the conditions described in Example 1, with the difference that this time, the enzyme ENZYSIZE L 125, sold by the company, is used.
• GENENCOR in quantities such that, after conversion and special dilution conditions, an adhesive is obtained which, at 17% dry matter and at 60 ° C., has a viscosity, measured on a Brookfield viscometer, as desired, either close to 250 mPa.s.
• This glue thus converted is intended to be applied, by a surfacing operation on a size press, on a corrugated cardboard paper, the grammage of which is close to 120 g / m 2 , under conditions of controlled distribution such that the deposition, in starch, is close to 3 g / m 2 for each of the two faces.
• the objective is to act favorably on the properties of said corrugated paper (burst strength), or those of corrugated cardboard made with it (CMT 30).
• a synthetic bonding agent is added to the adhesive in amounts such that it occurs at a rate of 0.5% (commercial material / dry) relative to the paper, and optionally, comparative way:
• Table III measurements after surfacing with adhesives presented at 50 ° C and 70 ° C:
• the wettability measured by the PDA (Penetration Dynamic Analysis), a relative quantity corresponding to the time necessary for the water to come into contact with the paper, is significantly improved.
• the time required for wetting is, in fact, reduced significantly by the addition of sorbitol and, above all, of the combination C 1, either comparatively between treatments with an adhesive having been added with sorbitol or combination of saccharides, vis-à-vis a non-adjuvanted glue.
• the reaction time in the continuous reactor is adjusted to approximately 20 minutes, so that an adhesive with 22.5% dry matter is obtained, the pH read of which is approximately 6 and the viscosity of approximately 200 mPa.s measured with the Brookfield viscometer at 65 ° C.
• a surfacing operation is carried out, using DIXON brand pilot equipment, on a paper intended for printing or writing, of a grammage close to 65 g / m 2 , so that the deposition of starchy material is more or less close to 3 g / m 2 , thus corresponding to approximately 5% of starchy material counted in relation to the mass of the fibrous mat.
• a witness is constituted by a paper treated with the adhesive as described above.
• a second surfacing operation is carried out with the same adhesive which has received, in addition, approximately 7.5% of the combination C 1, counted with respect to the starchy material.
• the contribution of the combination C 1 to the paper represents approximately 0.375% of the mass thereof.
• thermochemical procedure essentially corresponds to the action of ammonium persulfate on a wheat starch milk prepared with 24% dry matter.
• the amount of commercial ammonium persulfate introduced is 2.5 parts per 1000 of dry wheat starch.
• the glue obtained is stored at 15.5% dry matter and at 75 ° C.
• a control paper having a grammage close to 120 g / m 2 and intended for the fluting of a corrugated cardboard, receives a quantity of dry wheat starch of approximately 6 g / m 2 , counted compared to the paper, by size-press surfacing.
• a second step comparative tests are carried out using, in a size press, an adhesive as defined above, but which has also received an amount of combination C 1 corresponding to 7% counted relative to the dry wheat starch.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
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• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Crystallography & Structural Chemistry (AREA)
• Wood Science & Technology (AREA)
• Paper (AREA)
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• 2002
  • 2002-07-10 FR FR0208707A patent/FR2842222B1/fr not_active Expired - Fee Related
• 2003
  • 2003-07-08 CA CA 2491875 patent/CA2491875A1/fr not_active Abandoned
  • 2003-07-08 CN CN038162210A patent/CN1665900A/zh active Pending
  • 2003-07-08 JP JP2004520738A patent/JP2005537397A/ja active Pending
  • 2003-07-08 US US10/520,415 patent/US20060108081A1/en not_active Abandoned
  • 2003-07-08 AU AU2003264694A patent/AU2003264694A1/en not_active Abandoned
  • 2003-07-08 MX MXPA05000481A patent/MXPA05000481A/es not_active Application Discontinuation
  • 2003-07-08 EP EP03763937A patent/EP1534796A1/fr not_active Withdrawn
  • 2003-07-08 WO PCT/FR2003/002119 patent/WO2004007629A1/fr not_active Application Discontinuation

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