US20050150622A1 - Paper and paperboard production process and corresponding novel retention aids, and papers and paperboards thus obtained - Google Patents

Paper and paperboard production process and corresponding novel retention aids, and papers and paperboards thus obtained Download PDF

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US20050150622A1
US20050150622A1 US11/074,662 US7466205A US2005150622A1 US 20050150622 A1 US20050150622 A1 US 20050150622A1 US 7466205 A US7466205 A US 7466205A US 2005150622 A1 US2005150622 A1 US 2005150622A1
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cross
polymer
emulsion
shearing
reverse phase
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Rene Hund
Christian Jehn-Rendu
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SNF SA
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SNF SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
    • D21H23/765—Addition of all compounds to the pulp
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays

Definitions

  • the present invention relates to the technical field of paper production and the polymers used in this field.
  • the invention relates to a process for the manufacture of a paper or paperboard with improved retention.
  • bentonite be added to the pulp, possibly together with other mineral products such as aluminum sulfates or even synthetic polymers, notably polyethylene imine (see for example the documents DE-A-2 262 906 and U.S. Pat. No. 2,368,635).
  • cross-linked retention aids as described, for example, in European patent 0 202 780, primarily for the treatment of water, and secondarily for paper. It is important to note that it uses a cross-linked product, which is added to the suspension to be flocculated, the flocs then being sheared during the paper production process, that is, sheared in and at the same time as the paper pulp. The flocs are thus transformed into flocs that are smaller and more shear resistant, therefore more tenacious. This document neither suggests nor describes any shearing of the polymer itself before introduction into the suspension to be flocculated.
  • flocs of fairly large size are formed, and are then sheared so as to form flocs which, in the documents cited, are said to be smaller and more tenacious.
  • European patent 0 201 237 describes a flocculation process in which a polymer material is added to water to form an aqueous composition, and is used to flocculate the solid matter in suspension in an aqueous suspension, said polymer comprising a polymer of high molecular weight that is subjected to a shearing, this shearing being carried out before or during the flocculation and the polymer being required to have certain intrinsic properties, which are indicated in this patent.
  • the polymer is a polymer of high molecular weight, formed from water-soluble monomers or from a mixture of such monomers, and the polymer is subjected to shearing.
  • the process described in this patent is characterized in that it is possible to carry out the shearing before or during the flocculation.
  • European patent 0 201 237 further indicates that the polymer used comprises a cross-linked water-swellable polymer which it is possible to shear to an intrinsic viscosity of at least 4 dl/g. It is also indicated that the aqueous composition containing the polymer material can be a stable and homogenous composition, the shearing in this case causing an increase in the intrinsic viscosity of at least 1 dl/g.
  • stable and homogenous designates a polymer composition that is stable when the polymer is at full equilibrium with the water, i.e., when it has reached its ultimate degree of solubility or swelling.
  • the composition is also homogeneous in the sense that the polymer remains uniformly dispersed throughout the composition, without having a tendency to precipitate after several days.
  • the document also indicates that it is possible to carry out the shearing on the production line, as the suspension to be flocculated approaches a centrifuge, a filter press or a belt press, or another water removal stage. It is also indicated that the shear can be applied during a water removal stage that is conducted under a certain shear, preferably in a centrifuge or even in a filter press or a belt press.
  • this document only teaches a shearing of the flocs in the mixing pump or “fan pump” for the papermaking application. Moreover, it teaches that very low shear rates can be appropriate in the other applications, since filter presses and belt presses induce very low shear.
  • the invention eliminates the drawbacks mentioned above.
  • Its object is an improved process of the type in question, which incorporates operations comprised of adding to the suspension or fibrous mass to be flocculated, or paper pulp,
  • the second retention aid is bentonite, and in this field the reader is referred to the teaching of the above-mentioned U.S. Pat. No. 4,753,710, which can advantageously be replaced by a kaolin, preferably pre-treated by a polyelectrolyte, according to the teaching of French patent 95 13 051 filed in the name of the Applicant; and it would be useful for one skilled in the art to refer to these documents for the details of implementation, the usual additives, etc.
  • This process according to the invention makes it possible to obtain a distinctly improved retention of fines and fillers without a reverse effect.
  • An additional characteristic of this improvement is that the drainage properties are also improved, which is unexpected given the improvement of the retention, and excellent formation is maintained, which is also surprising.
  • the cross-linked polyacrylamide (or more generally the cross-linked (co)polymer) is introduced into the suspension or pulp to be flocculated in the form of the reverse phase water-in-oil emulsion derived from the synthesis, and itself “inverted” in water, or in the form of a solution in water, with about 5 g of polymer/liter, of the powder obtained by drying the reverse phase water-in-oil emulsion from the synthesis, said emulsion or said solution being sheared before introduction into the pulp or suspension to be flocculated, the dosage for the introduction being established at a rate of 0.03 to one per mill (0.03 to 1% o, or 30 to 1000 g/t) by weight of active material (polymer) relative to the dry weight of the fibrous suspension, preferably 0.15 to 0.5 per mill, or 150 to 500 g/t.
  • this water-in-oil polymer emulsion is diluted in water to obtain a polymer content on the order of 5 to 10 g/l, preferably close to 5 g/l, and is thus “inverted” by this dilution to form a solution, which is sheared according to the invention before its introduction into the pulp.
  • Example 3 shows that the results of the sheared solution of the powder obtained by drying the emulsion are equivalent.
  • flocs of fairly large size are formed, which are then sheared so as to form flocs which, in the documents cited, are said to be smaller and more tenacious.
  • the “dual” systems of the prior art were essentially composed of linear polymers with an addition of bentonite, or of a branched polyacrylamide or a starch, with an addition of colloidal silica, this last component being extremely expensive.
  • a main retention aid is used, which is cross-linked and which is sheared before its introduction into the pulp, preferably in the form of a reverse phase water-in-oil emulsion, which leads directly to microflocs without going through the shearing of larger flocs involving the fibrous mass.
  • the Applicant in effect maintains that a microflocculation occurs directly as a result of the intense shearing carried out on the polymer itself before its injection into the fibrous mass of pulp, which is quite a different (and unexpected) process than reducing the size of large flocs (involving the fibrous mass) into smaller, more tenacious flocs, and which results in unforeseen improvements in the properties of the paper or paperboard sheet.
  • the monomers used for the preparation of the (co)polymer can be nonionic, but generally at least some of the monomers used to form the polymer are ionic.
  • the monomers are normally monomers with monoethylenic unsaturation, sometimes allylic monomers, but generally vinyl monomers. These are generally acrylic or methacrylic monomers.
  • Suitable nonionic monomers are acrylamide, methacrylamide, N-vinyl methyl acetamide or formamide, vinyl acetate, vinylpyrrolidone, methyl methacrylate or methacrylates of other acrylic esters, or of other esters with ethylenic unsaturation, or even of other vinyl monomers that are insoluble in water such as styrene or acrylonitrile.
  • Suitable anionic monomers are for example sodium acrylate, sodium methacrylate, sodium itaconate, 2-acrylamido-2-methylpropane sulfonate (AMPS), the sulfopropylacrylates or sulfopropylmethacrylates, or other water-soluble forms of these polymerizable sulfonic or carboxylic acids. It is possible to use a sodium vinylsulfonate or an allylsulfonate, or a sulfomethyl acrylamide.
  • AMPS 2-acrylamido-2-methylpropane sulfonate
  • Suitable cationic monomers are the dialkylaminoalkyl acrylates and methacrylates, particularly dialkylaminoethyl acrylate, as well as their acid salts or their quaternary products, and even the dialkylaminoalkylalkylacrylamides or methacrylamides, as well as their acid salts and the products of quaternization, for example methacrylamidopropyl trimethyl ammonium chloride and the Mannich products such as the quaternized dialkylaminomethylacrylamides.
  • the alkyl groups in question are generally C 1 -C 4 alkyl groups.
  • the monomers can contain hydrophobic groups, for example as described in European patent 0 172 723, and in certain cases allylic ether monomers could be preferred.
  • (co)polyacrylamide will be used herein to designate all of the combinations of these monomers, which are well known to one skilled in the art.
  • the cross-linked (co)polyacrylamide is a cationic copolymer of acrylamide and of an unsaturated cationic ethylenic monomer, chosen from the group comprising dimethylaminoethyl acrylate (ADAME), dimethylaminoethyl methacrylate (MADAME), quaternized or salified by different acids and quaterinizing agents, benzyl chloride, methyl chloride, alkyl or aryl chloride, dimethyl sulfate, diallyldimethylammonium chloride (DADMAC), acrylamidopropyltrimethylammonium chloride (APTAC), and methacrylamidopropyltrimethylammonium chloride (MAPTAC).
  • ADAME dimethylaminoethyl acrylate
  • MADAME dimethylaminoethyl methacrylate
  • benzyl chloride methyl chloride, alkyl or aryl chloride, dimethyl sulfate,
  • this (co)polymer is cross-linked by a cross linker constituted by a compound having at least two reagent groups chosen from the group comprising the double bonds, the aldehyde bonds or the epoxy bonds.
  • a cross linker constituted by a compound having at least two reagent groups chosen from the group comprising the double bonds, the aldehyde bonds or the epoxy bonds.
  • a cross-linked polymer is a polymer which, in the branched chain, has groups or branchings disposed globally in three dimensions, resulting in practically insoluble products of infinite molecular weight; cross-linked polymers of this type having high molecular weights are well known as flocculating agents, for example as described in European patent 0 202 780 or European patent 0 201 237, whose teachings are equivalent.
  • the cross-linking can be carried out during or after the polymerization, for example by reaction of two soluble polymers having counter-ions, or by reaction on formaldehyde or a polyvalent metal compound. Often, the cross-linking is carried out during the polymerization by addition of a cross linker, and this method is clearly preferred according to the invention. These processes for polymerization with cross-linking are known.
  • cross linkers that can be incorporated comprise ionic cross linkers such as polyvalent metal salts, formaldehyde, glyoxal, or preferably, covalent cross linkers that will copolymerize with the monomers, preferably monomers with diethylenic unsaturation (like the family of diacrylate esters such as the diacrylates of polyethylene glycol PEG) or polyethylenic unsaturation, of the type classically used for the cross-linking of water-soluble polymers, and particularly methylenebisacrylamide (MBA), or any of the other known acrylic cross linkers.
  • ionic cross linkers such as polyvalent metal salts, formaldehyde, glyoxal, or preferably, covalent cross linkers that will copolymerize with the monomers, preferably monomers with diethylenic unsaturation (like the family of diacrylate esters such as the diacrylates of polyethylene glycol PEG) or polyethylenic unsaturation, of the type classically used for the cross
  • the cross linker is methylenebisacrylamide (MBA), introduced at a rate of five to two hundred (5 to 200) moles per million moles of monomers, preferably 5 to 50, preferably 10 or 20.
  • MBA methylenebisacrylamide
  • the quantity of cross-linked polyacrylamide introduced is between 0.03 per mill and one per mill (0.03% o and 1% o) or between thirty and one thousand grams of active polymer/ton of dry pulp (30 and 1000 g/t), preferably between 0.15 and 0.5 per mill (% o) of the quantity of dry pulp, or from 150 to 500 g/t; it was observed that if the quantity is less than 0.03% o, no significant retention is obtained; likewise, if this quantity exceeds 1% o, no proportional improvement is observed; however, unlike the linear cationic polyacrylamides, as described in the documents EP-A-0 017 353 and EP 0 235 893 mentioned in the preamble, there is no observed reverse dispersion effect by recirculation in the closed circuits of the excess polymer not retained in the sheet.
  • cross-linked polymer be prepared in the form of a reverse phase emulsion in order to achieve the improvement of the invention.
  • Bentonite also known as “smectic swelling clay,” from the montmorillonite family, is well known and there is no need to describe it in detail here; these compounds, formed of microcrystallites, comprise surface sites having a high cation exchange capacity capable of retaining water (see for example the document U.S. Pat. No. 4,305,781, which corresponds to the document EP-A-0 017 353 mentioned above, and FR-A-2 283 102).
  • a commercial bentonite CPB1 with a density of 900 kg/m 3 , a swelling capacity of 40 ml/g, a cation exchange capacity of 85 meq/100 g in the dry state, and an average size of ⁇ 75 microns, was used.
  • the use of this bentonite is not limiting.
  • a semisodic bentonite is used, which is introduced just upstream from the headbox, at a rate of 0.1 to 0.5 percent (0.1 to 0.5%) of the dry weight of the fibrous suspension.
  • kaolins GCC or ground CaCO 3 , precipitated CaCO 3 or PCC, and the like.
  • a cross-linked retention aid prepared in the form of a reverse phase emulsion, is either used directly in the form of the synthetic emulsion (“inverted” as described above), or in the form of the solution of the powder obtained by drying said emulsion, the emulsion or the solution being sheared before its injection or introduction into the pulp to be flocculated, which leads directly to microflocs without going through the shearing of larger flocks involving the fibrous mass.
  • the Applicant in effect maintains that a microflocculation occurs directly when the intense-shearing is carried out on the polymer itself before its injection into the fibrous mass of pulp, which is quite a different process than reducing the size of large flocs (involving the fibrous mass) into smaller, more tenacious flocs, which results in unforeseen improvements in the properties of the paper or paperboard sheet.
  • a shearing of the pulp in a pump of the “fan pump” type does not produce the anticipated result.
  • the invention chiefly relates to a process without intercalary shearing of the pulp, but also to a process comprising such an intercalary shearing, whether it be deliberate or imposed by the constraints of the existing equipment.
  • the properties obtained will be better without this intercalary shearing, but if the injection point of the sheared polymer cannot be chosen freely by the paper manufacturer because of the existing equipment, the paper manufacturer can benefit from the excellent set of properties provided by the invention without having to modify its machine.
  • a reverse phase emulsion of the polymer (“inverted” in water) or even the powder obtained from the emulsion by means of a known drying technique, such as for example “spray drying,” solvent precipitation, or agglomeration (PEG) and grinding (on this subject, see also the prior art, such as U.S. Pat. No. 5,696,228, WO 97/48 755 (U.S. Ser. No. 08/668,288) WO 97/48 750, WO 97/48 732, WO 97/34 945, WO 96/10589, U.S. Pat. Nos.
  • This variant of the method is very interesting since the dried product according to the invention behaves substantially like the emulsion, and this variant therefore provides a method for using dry products having the advantages of an emulsion, which it is not always possible to prepare by direct polymerization in the aqueous phase, in gel form or in solution.
  • laboratory shearing tests can be conducted, with a concentration on the order of 3-5 to 10-15 g of active material (i.e., the polymer)/liter of emulsion of the polymer, preferably between 5 and 10 g/l, in a piece of equipment known as an “Ultra Turrax”TM, for example at 10,000 rpm, or in a household mixer of the “Moulinex”TM type, substantially at the same magnitude of rotation speed, for a duration that can last between 15-30 seconds and 2-5 minutes.
  • active material i.e., the polymer
  • emulsion of the polymer preferably between 5 and 10 g/l
  • Ultra Turrax for example at 10,000 rpm
  • a household mixer of the “Moulinex”TM type substantially at the same magnitude of rotation speed, for a duration that can last between 15-30 seconds and 2-5 minutes.
  • an ionic regain (IR as defined in European patent 0 201 237) of 40 to 50% is obtained, which can reach at least 60 or 70%, and even more, up to values greater or far greater than 100%.
  • a normal dosage of the agent according to the invention is such that it leads to about 100 to 500 g of active material (polymer) per ton of fibrous matter to be treated.
  • the system according to the invention is not expensive, and consequently it combines all of the advantages of the linear or cross-linked single-product systems with floc shearing and of the “dual” systems with two retention aids and also with floc shearing.
  • the cross-linked polymer in reverse phase emulsion (or in a solution of the redissolved powder), sheared according to the invention, is injected or introduced into the paper pulp (or fibrous mass to be flocculated), which is more or less diluted in accordance with the experience of one skilled in the art, and generally into the diluted paper pulp or “thin stock,” i.e., a pulp diluted to about 1.5% solid matter such as cellulose fibers, possible fillers, and the various additives commonly used in paper production.
  • the second retention aid, or secondary retention aid, such as bentonite or a preferably pretreated kaolin, is then added into said pulp without any intercalary shearing, or with an “optional” intercalary shearing, for example, in practice, between 5 and 30 seconds, preferably between about 10-20 s, but possibly up to 5 minutes, after the introduction into the pulp of the pre-sheared polymer in reverse phase emulsion (or in a solution of the redissolved polymer).
  • FIGS. 1 and 2 represent the histograms corresponding to Tables (I) and (II).
  • X designates a “first pass” measurement. Formation scale: 1 Excellent (homogeneous) 2 Good (nearly homogeneous) 3 Average (cloudy) 4 Poor (fleecy) 6 Very poor (mottled)
  • the constituents of the organic phase of the emulsion to be synthesized are mixed at the ambient temperature.
  • the contents of B are mixed into A under agitation. After the mixture of the phases, the emulsion is sheared in the mixer for 1 minute in order to create the reverse phase emulsion. The emulsion is then degassed by means of a nitrogen bubbling; then after 20 minutes, the gradual addition of the metabisulfite causes the initiation followed by the polymerization.
  • a “burn out” treatment with a bisulfite or metabisulfite to eliminate the residual monomer is carried out in order to reduce the free monomer content.
  • the emulsion is then incorporated with its inverting surfactant in order to subsequently release the polymer in the aqueous phase. It is necessary to introduce 2 to 2.4% ethoxylated alcohol.
  • the standard Brookfield viscosity of said polymer is 1.8 cps (viscosity measured at 0.1% in a 1 M NaCl solution at 25° C. at sixty rpm).
  • the cross-linked product develops a high ionic regain and a very high IV regain.
  • Ionic regain IR ( X ⁇ Y )/ Y ⁇ 100
  • Pulp Used mixture of 70% bleached hardwood kraft KF 10% bleached softwood kraft KR 20% mechanical pulp : PM 20% natural calcium carbonate.
  • the pulp used is diluted to a consistency of 1.5%.
  • a sample of 2.24 dry g of pulp, or 149 g of pulp at 150%, is taken, then diluted to 0.4% with clear water.
  • the 560 ml volume is introduced into the plexiglass cylinder of the (standard) automated sheet former, and the sequence is begun in accordance with the two procedures A and B.
  • Example 3 corresponds to a linear polymer similar to the “HYDROCOL”TM technique of the above-mentioned U.S. patent '710 (a linear polymer). The results are therefore similar to test 7, which corresponds to the technique of U.S. patent '710 likewise, tests 2 and 6 are comparable (a linear polymer, but without bentonite).
  • Test 5 corresponds to a cross-linked polymer emulsion, sheared before injection into the pulp, and hence according to the invention, which leads to a extremely advantageous performance in terms of drainage (CSF Canadian Standard Freeness) while having excellent formation (an index of 1 as opposed to 2 for the other comparable tests).
  • Tests 8 through 13 verified the effect obtained when attempting to eliminate the shearing of the pulp between the two additions, in contrast to U.S. patent '710. It may be seen that, in a “HYDROCOL”TM context, it is important to shear the pulp. In effect, it is possible to obtain a very high flocculation if the pulp is not sheared, but the formation suffers (indexes of 4 or 5), making it unusable.
  • test 5 (A) shearing of the pulp
  • test 11(B) shearing of the pulp
  • the constituents of the organic phase of the emulsion to be synthesized are mixed at the ambient temperature.
  • the contents of B are mixed into A under agitation. After the mixture of the phases, the emulsion is sheared in the mixer for 1 minute in order to create the reverse phase emulsion.
  • the emulsion is then degassed by means of a nitrogen bubbling; then after 20 minutes, the gradual addition of the metabisulfite causes the initiation followed by the polymerization.
  • Example 2 leads to the same types of conclusions as Example 1.
  • the formation is maintained at an excellent level of 2.
  • the drainage, filler retention and first pass retention are improved considerably.
  • the invention is therefore compatible with all the existing papermaking equipment, including the equipment in which the injection point of the polymer cannot be chosen freely.
  • the invention provides another important advantage relative to a very good formation of the sheet.
  • formation indicates qualities of the sheet such as homogeneity and the like.
  • Example 1 is repeated in order to prepare the product PF 455 G in reverse phase emulsion.
  • This reverse phase emulsion is dried by means of a known spray drying technique; a white powder is obtained which is redissolved in water, to 5 g of polymer per liter.
  • Table (III) An examination of Table (III) shows that the solution sheared before injection, SD 455 B, obtained by dissolution in water of 5 g of polymer/liter of the powder obtained by spray drying the emulsion PF 455 G, behaves substantially like the sheared emulsion itself.
  • the invention also relates to the novel retention aids described above, which consist of or comprise a sheared cross-linked polyacrylamide (or more generally a cross-linked acrylic (co)polymer) in reverse phase (or water-in-oil) emulsion (inverted in water), or in the form of the sheared solution of the powder obtained by drying said emulsion, as well as the processes for producing sheets of paper, paperboard or the like that use the agents according to the invention or the process according to the invention described above, and the sheets thus obtained.
  • a sheared cross-linked polyacrylamide or more generally a cross-linked acrylic (co)polymer
  • reverse phase or water-in-oil emulsion (inverted in water)

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US11/074,662 1998-06-12 2005-03-09 Paper and paperboard production process and corresponding novel retention aids, and papers and paperboards thus obtained Abandoned US20050150622A1 (en)

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Application Number Priority Date Filing Date Title
US11/074,662 US20050150622A1 (en) 1998-06-12 2005-03-09 Paper and paperboard production process and corresponding novel retention aids, and papers and paperboards thus obtained

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9807545A FR2779752B1 (fr) 1998-06-12 1998-06-12 Procede de fabrication de papier et carton et nouveaux agents de retention correspondants, et papiers et cartons ainsi obtenus
FR98/07545 1998-06-12
PCT/FR1999/001277 WO1999066130A1 (fr) 1998-06-12 1999-06-01 Procede de fabrication de papier et carton et agents de retention correspondants
US70158201A 2001-03-09 2001-03-09
US11/074,662 US20050150622A1 (en) 1998-06-12 2005-03-09 Paper and paperboard production process and corresponding novel retention aids, and papers and paperboards thus obtained

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PCT/FR1999/001277 Continuation WO1999066130A1 (fr) 1998-06-12 1999-06-01 Procede de fabrication de papier et carton et agents de retention correspondants
US70158201A Continuation 1998-06-12 2001-03-09

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US (1) US20050150622A1 (fr)
EP (1) EP1086276B1 (fr)
JP (1) JP2002518609A (fr)
KR (1) KR100694912B1 (fr)
AT (1) ATE275669T1 (fr)
AU (1) AU4043899A (fr)
CA (1) CA2334744C (fr)
DE (1) DE69920014T2 (fr)
FR (1) FR2779752B1 (fr)
WO (1) WO1999066130A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040040683A1 (en) * 1998-06-04 2004-03-04 Snf Sa Paper and paperboard production process and corresponding novel retention and drainage aids, and papers and paperboards thus obtained
FR2929963A1 (fr) * 2008-04-10 2009-10-16 Snf Sas Soc Par Actions Simpli Procede de fabrication de papier et carton
US20110112224A1 (en) * 2009-11-06 2011-05-12 Sachin Borkar Surface Application of Polymers and Polymer Mixtures to Improve Paper Strength
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CN107254802A (zh) * 2017-06-07 2017-10-17 常州彤骉贸易有限公司 一种造纸用助留剂
US10035946B2 (en) 2016-02-23 2018-07-31 Ecolab Usa Inc. Hydrazide crosslinked polymer emulsions for use in crude oil recovery
US10323114B2 (en) 2013-01-31 2019-06-18 Ecolab Usa Inc. Mobility control polymers for enhanced oil recovery
US10442980B2 (en) 2014-07-29 2019-10-15 Ecolab Usa Inc. Polymer emulsions for use in crude oil recovery
CN115073677A (zh) * 2022-07-22 2022-09-20 山东诺尔生物科技有限公司 一种助留剂的制备方法及助留剂
CN115612020A (zh) * 2022-10-31 2023-01-17 浙江鑫甬生物化工股份有限公司 珠状微交联型聚丙烯酰胺类造纸增强剂的制备方法及其应用
CN116096963A (zh) * 2020-07-30 2023-05-09 Spcm股份公司 纸和纸板的制造方法

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FR2929963A1 (fr) * 2008-04-10 2009-10-16 Snf Sas Soc Par Actions Simpli Procede de fabrication de papier et carton
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US9512568B2 (en) 2013-03-14 2016-12-06 Ecolab Usa Inc. Methods for increasing retention and drainage in papermaking processes
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US10442980B2 (en) 2014-07-29 2019-10-15 Ecolab Usa Inc. Polymer emulsions for use in crude oil recovery
US11118099B2 (en) 2014-07-29 2021-09-14 Championx Usa Inc. Polymer emulsions for use in crude oil recovery
US10035946B2 (en) 2016-02-23 2018-07-31 Ecolab Usa Inc. Hydrazide crosslinked polymer emulsions for use in crude oil recovery
CN107254802A (zh) * 2017-06-07 2017-10-17 常州彤骉贸易有限公司 一种造纸用助留剂
CN116096963A (zh) * 2020-07-30 2023-05-09 Spcm股份公司 纸和纸板的制造方法
CN115073677A (zh) * 2022-07-22 2022-09-20 山东诺尔生物科技有限公司 一种助留剂的制备方法及助留剂
CN115612020A (zh) * 2022-10-31 2023-01-17 浙江鑫甬生物化工股份有限公司 珠状微交联型聚丙烯酰胺类造纸增强剂的制备方法及其应用

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CA2334744C (fr) 2008-07-15
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EP1086276A1 (fr) 2001-03-28
ATE275669T1 (de) 2004-09-15
KR20010072606A (ko) 2001-07-31
DE69920014D1 (de) 2004-10-14
CA2334744A1 (fr) 1999-12-23
DE69920014T2 (de) 2005-09-15
FR2779752B1 (fr) 2000-08-11
WO1999066130A1 (fr) 1999-12-23
AU4043899A (en) 2000-01-05
KR100694912B1 (ko) 2007-03-14
FR2779752A1 (fr) 1999-12-17

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