Abstract: A tackified, mixed rubber, hot melt PSA deinking composition and an improved process for removing inks and other contaminants from printed wastepaper are provided. A preferred deinking composition contains a mixture of SB and SIS rubbers, tackified with at least one hydrocarbon resin tackifier and at least one rosin-based tackifier. In an improved deinking or recycling process, the novel composition is added to a paper slurry, either directly or as PSA-coated paper or label stock, and significantly reduces the number of contaminants that remain after screening and forward cleaning.

Abstract: Process for making polyamine-epihalohydrin resin products having very low levels of epihalohydrin or epihalohydrin hydrolyzates, particularly useful in papermaking, which includes, amongst other features, producing a polyamine-epihalohydrin polymer in aqueous solution, terminating the reaction by cooling, adjusting the pH of the polyamine-epihalohydrin solution to from about 7.5 to about 11 and concurrently heating the solution to about 35 to about 50.degree. C., and contacting the aqueous solution with selected microorganisms or an enzyme, and deactivating or removing the enzymes or microbes, cooling to about 20.degree. C. and stabilizing the composition by adjusting the pH to about 2.0 to 5.0 by the addition of acid.

Abstract: A process for recycling fiber products employs an aqueous deinking medium containing an effective amount of a collector chemical. The collector chemical comprises a surface active agent which is or can be derived from lanolin. Alkoxylated lanolin derivatives are preferred.

Abstract: A process for producing a thiourea dioxide fluid by mixing thiourea and a peroxide, or thiourea, a peroxide and a reaction catalyst, or thiourea, a peroxide, a reaction catalyst and a chelating agent, in the absence or presence of pulp and a process for bleaching pulp by the use of the thiourea dioxide fluid produced by the above process economically advantageously with a small chemicals loss and by small consumption of energy.

Abstract: An aqueous printing ink composition containing finely dispersed pigments and a synthetic polymer binder, the binder containing: (a) finely dispersed, aqueous-basic insoluble emulsion (co)polymers having a number average molecular weight of from about 10,000 to 1,000,000 and a glass transition temperature of up to 0.degree. C., in intimate admixture with (b) aqueous-basic soluble or dispersible (co) polymers having a number average molecular weight lower than that of the (co)polymers of component (a) and a glass transition temperature of at least 0.degree. C.

Abstract: A waste paper treatment process for the recycle and re-use of waste paper, which process comprises treating the waste paper, in a repulper, with a surfactant, in the absence of traditional repulper chemicals such as silicate, caustic and peroxide. The surfactant is preferably a copolymer of ethylene oxide and propylene oxide, and is used in a sufficient concentration to form ink agglomerates. The ink agglomerates are retained on the paper, rather than being removed as in waste paper deinking. The process permits the elimination of normal repulper chemicals, and reduces the amount of ink sludge generated, while providing acceptable brightness levels for the recycled pulp.

Abstract: A method for separating wax from wax containing paper. The method involves immersing the wax containing paper in a heated alkane solvent, preferably n-hexane, to dissolve the wax contained in the paper into the solvent. The dissolved wax and solvent forms a miscella which is later separated from the paper. Any residual solvent absorbed in the paper is removed therefrom. The method also involves retrieving the wax from the miscella.

Abstract: A process for the deinking of wastepaper is disclosed. The process comprises administering a sufficient amount of a branched alcohol alkoxylate surfactant to a sample of waste paper for which treatment is desired. The surfactant is effective for the flotation of the ink.

Abstract: A method and composition for suppressing or inhibiting the decomposing action of enzymes on hydrogen peroxide, e.g. peroxidase and catalase, during bleaching of cellulose fibres with hydrogen peroxide, especially in connection with the production of recycled paper, in such a way that microorganisms are not markedly affected, and discharges that are dangerous to the environment are minimized. The composition contains hydroxylamine, thiocyanate salts, formic acid, ascorbic acid or nitrites.

Abstract: The present invention is directed to a deinking agent with which a high-quality pulp sheet having a low Eric number can be obtained.The deinking agent for wastepaper reclamation comprises (a) an alkylene oxide adduct of an ester prepared from a dimer acid and/or polymer acid obtained from an unsaturated fatty acid having a specific number of carbon atoms, and an alcohol having a specific number of carbon atoms at a specific molar ratio, and (b) a higher fatty acid and/or higher fatty acid soap having a specific number of carbon atoms, provided that the (a)/(b) weight ratio is 95/5 to 60/40.

Abstract: In the production of pulp and paper from starch-coated paper, the deinking effect can be improved by including a treatment with a starch-degrading enzyme e.g. amylase or a debranching enzyme. The process comprises enzyme treatment before, during or after disintegration of the paper to produce pulp, followed by separation of ink particles.

Abstract: Deinking of impact and nonimpact printed paper is accomplished by repulping the printed paper in an alkali aqueous medium containing a deinking composition comprising one or more nonionic surfactants and/or alkanols. The presence of the deinking composition causes ink particles to agglomerate, which are removed from the aqueous medium by size and density separation. The invention provides an agglomeration method with high ink removal from all types of impact and nonimpact printed paper.

Abstract: The present invention provides a froth flotation process for the separation of paper and wood fibers from printed and copying inks and other contaminants during the recycling of paper. A liquid solution containing a frothing agent is applied from the top of a froth flotation device, preferably in the form of a spray, to the upper surface or portion of an aqueous pulp slurry present in the device, or of a froth phase produced in the device, prior to or during the froth flotation process.

Abstract: Recycling of mixed wastepaper, including plastic coated paper and printed paper, is accomplished by repulping the wastepaper mixture to disperse paper fibers, ink and plastic components into a pulp medium. Contact with a deinking chemical causes attraction between the ink components to form larger ink particles. The ink is adsorped onto the plastic components to form ink/plastic clusters which are removed to produce a substantially ink and plastic free pulp medium. Recycled paper products with improved strength comprising paper fibers from pulp medium produced in accordance with the method of the invention are also provided.

Abstract: An improved process is disclosed for deinking waste paper which contains nonimpact printed papers printed with xerographic and laser inks by repulping the waste paper to form a slurry in the presence of an agglomeration agent and magnetite and subjecting the slurry to a magnetic field to remove the agglomerated ink particles, whereby the improvement comprises replacement of a portion of the agglomeration agent with a copolymer of styrene and acrylic monomers which copolymer is further characterized by having a Ring and Ball softening point of 70.degree.-105.degree. C. and an number average molecular weight of 2,000 to 10,000. The magnetic treatment preferably is conducted at ambient or greater temperature, at neutral to alkaline pH, and at a low pulp consistency.

Abstract: A nonionic surfactant having cyclic 1,3-dioxane and/or 1,3-dioxolane functionality which is irreversibly splittable by lowering the pH of its aqueous solution is useful in various processes requiring the removal of emulsified hydrophobic contaminants or other hydrophobic materials from an aqueous stream. After splitting of the surfactant into its component ketone and polyol, the hydrophobic components phase-separate and can be removed from the aqueous stream by routine means.

Abstract: An improved process is disclosed for deinking waste paper which contains nonimpact printed papers printed with xerographic and laser inks by repulping the waste paper to form a slurry in the presence of an agglomeration agent and magnetite and subjecting the slurry to a magnetic field to remove the agglomerated ink particles, whereby the improvement comprises replacement of a portion of the agglomeration agent with a copolymer of styrene and acrylic monomers which copolymer is further characterized by having a Ring and Ball softening point of 70.degree.-105.degree. C. and an number average molecular weight of 2,000 to 10,000. The magnetic treatment preferably is conducted at ambient or greater temperature, at neutral to alkaline pH, and at a low pulp consistency.

Abstract: A deinking agent comprising a compound represented by the following general formula I is herein provided:R.sup.1 O--(PO)m--(EO)n--(XO)k--R.sup.2 (I)(wherein R.sup.1 represents an alkyl or alkenyl group having 12 to 22 carbon atoms; R.sup.2 represents a hydrogen atom or an acyl group having 2 to 24 carbon atoms; PO, EO and XO represent a propylene oxide unit, an ethylene oxide unit and an alkylene oxide unit having not less than 3 cabon atoms, respectively; m=1.about.8; n=10.about.40; and k is such a number that the number of total carbon atoms present in the polymerized XO unit ranges from 3 to 120; the PO and EO in Formula (I) being added through block-addition). The use of the deinking agent in the deinking methods, in particular, the flotation method permits the preparation of high quality reclaimed pulp having high brightness and a low content of residual ink and also ensures stable operations for the methods.

Abstract: A method for improving products such as toothpaste, shampoo, soap, detergent and lotions or creams and such improved products. The products are improved by adding a hydrous cellulose pulp that has an unlimited shelf life to the product. The hydrous cellulose pulp is resistant to decomposition and can be produced either by recycling waxed paper or through a process that begins with virgin vegetable constituents and wax. During the defibering process an emulsifier is added to the slurry and its temperature is elevated to 150.degree.-190.degree. Fahrenheit.

Abstract: A deinking agent for regenerating waste paper is provided, which can efficiently remove ink particles from the pulp fiber and obtain the regenerated pulp having a high brightness degree and a low content of residual ink. The deinking agent for regenerating waste paper comprises an enzyme and a compound represented by the general formula; R.sup.1 O--(PO)x--?(EO)y--(AO)z!--H (wherein R.sup.1 represents alkyl group or alkenyl group having 8--24 normal or branched chain carbon atoms; PO represents propylene oxide unit; EO represents ethylene oxide unit; AO represents alkylene oxide unit having not less than 3 carbon atoms; x and z represent respectively an integer of not less than 1 and satisfy the following formula, 10.ltoreq.x+z.ltoreq.100; y is an integer satisfying the following formula, 10.ltoreq.y.ltoreq.100; PO is added in the form of block configuration; and EO and AO are added in the form of block or random configuration).

Abstract: Describes a deinking agent composition and a method for deinking wastepaper printed with electrostatic ink or mixtures thereof with wastepaper printed with impact ink in which a combination of nonionic surfactants are added to an alkaline slurry of paper fibers. The surfactants are a first nonionic surfactant represented by the formula:R--Ph--(OC.sub.2 H.sub.4).sub.m --(OC.sub.3 H.sub.6).sub.n --(OC.sub.4 H.sub.8).sub.p --R.sup.1and a second nonionic surfactant represented by R.sup.5 --C.sub.6 H.sub.4 O--(C.sub.2 H.sub.4 O).sub.t --H, block copolymers of ethylene oxide and propylene oxide or mixtures of such second nonionic surfactants. R is an aliphatic hydrocarbon group containing from 8 to 10 carbon atoms, Ph is phenylene, R.sup.1 is chloro or phenoxy, R.sup.5 is C.sub.8 -C.sub.13 alkyl, the sum of m, n, and p is a number between 1 and 10, and t is a number between 1 and 9. The deinking agent composition also contains optional nonpolar solvent(s).

Abstract: This invention related to a process for the deinking of office wastepaper stocks which comprises:a) converting the wastepaper to a pulp,b) contacting the pulp with an aqueous medium of alkaline pH containing between about 0.05 and about 2 percent by weight, calculated on a dry weight basis of the pulp, of a deinking agent comprising a first component comprising at least one ethylene oxide adduct of a detergent-range alcohol having in the range of from about 8 to about 20 carbon atoms and an average of from about 3 to about 20 oxyethylene units per molecule of alcohol, and a second component selected from the group consisting of one or more detergent-range olefins having from about 8 to about 22 carbon atoms, one or more saturated hydrocarbons having from about 8 to about 20 carbon atoms, and mixtures thereof, andc) treating the resulting pulp-containing medium by washing or flotation to remove suspended ink therefrom.

Abstract: This invention related to a process for the deinking of a mixture of xerographically printed wastepaper stocks and ledger printed wastepaper stocks which comprises:a) converting the wastepaper to a pulp,b) contacting the pulp with an aqueous medium of alkaline pH containing between about 0.

Abstract: This invention relates to the deinking process for office wastepaper for utilization in a neutral medium. Particularly the invention relates to a deinking process for office wastepaper comprising the steps of: (a) converting wastepaper to pulp; (b) contacting the pulp with a deinking agent comprising of: i) an enzyme active at a pH of from about 4 to about 9 and ii) a nonionic surfactant selected from the group consisting of higher aliphatic alcohol alkoxylates, aliphatic acid alkoxylates, higher aromatic alcohol alkoxylates, fatty acid amides of alkanolamines, fatty acid amide alkoxylates, propylene glycol alkoxylates, block or random copolymers of ethylene and propylene oxide, higher alcohol polyethylene polypropylene block or random adducts and mixtures thereof; in an aqueous medium having a pH of from about 4 to about 9; and (c) removing ink from the pulp by flotation, water washing or a combination of flotation and water washing.

Abstract: This invention relates to the deinking process for office wastepaper for utilization in a neutral medium. Particularly the invention relates to a deinking process for office wastepaper comprising the steps of: (a) converting wastepaper to pulp; (b) contacting the pulp with a deinking agent comprising of: i) an enzyme active at a pH of from about 4 to about 9 and ii) a nonionic surfactant selected from the group consisting of higher aliphatic alcohol alkoxylates, aliphatic acid alkoxylates, higher aromatic alcohol alkoxylates, fatty acid amides of alkanolamines, fatty acid amide alkoxylates, propylene glycol alkoxylates, block or random copolymers of ethylene and propylene oxide, higher alcohol polyethylene polypropylene block or random adducts and mixtures thereof; in an aqueous medium having a pH of from about 4 to about 9; and (c) removing ink from the pulp by flotation, water washing or a combination of flotation and water washing.

Abstract: A liquid deinking composition comprising (a) a fatty acid mixture containing 40 to 90 weight % of saturated fatty acids having 12 to 14 carbon atoms and less than 60 weight % of saturated fatty acids having 16 to 18 carbon atoms, (b) a nonionic surfactant with HLB of 2 to 12 in a proportion of (a)/(b)=5/95 to 40/60 (weight ratio), and (c) 0 to 20 weight % (based on the composition) of water.No crystals of fatty acids are precipitated at ambient temperatures, and the separation, solidification or precipitation of crystals due to a temperature change is not caused. Further, the handling property is improved because of the liquid form.

Abstract: A method for dewatering deinking sludge utilizing a water soluble block copolymer having the structure: ##STR1## wherein E is a polymeric segment obtained from the polymerization of hydrophobic monomers, x when present is a nonionic monomer, y is a cationic monomer, R.sub.1 and R.sub.2 are the same or different and are H or a lower alkyl group from C.sub.1 to C.sub.3 and F is a salt of an ammonium cation. Preferably, the polymer contains from about 20 mole % to 35 mole % cationicity.

Abstract: A method of de-inking wastepaper by pulping the paper in the presence of an enzyme is disclosed. The enzyme dislodges the ink particles from the paper fibers. The preferred enzymes are the acid resistant carbohydrases. The de-inking medium is an aqueous solution of the enzyme, preferably maintained at a pH less than about 7 and at a temperature between about 20.degree. C. and about 60.degree. C. No conventional chemical de-inking agents are required. The dislodged ink particles may be removed by any conventional method, such as flotation or washing.

Abstract: A stable, fluid alkaline earth metal tallate dispersion is prepared by (i) forming a pre-emulsion of fatty acids derived from tall oil, water, and a surfactant; (ii) forming an alkaline earth metal salt dispersion from an alkaline earth metal oxide and/or hydroxide, a lower carboxylic acid, and water; and (iii) incorporating the pre-emulsion into the alkaline earth metal salt dispersion under high shear and low pressure.

Abstract: The invention comprises a method for clarifying ink-laden water obtained from the recycling of paper stocks by treating said water with a conventional coagulant followed by treatment with a hydrophilic dispersion polymer. The hydrophilic dispersion flocculant of the invention is a copolymer of dimethylaminoethyl (meth)acrylate methyl chloride quat (DMAEA.multidot.MCQ) cationic monomer and (meth)acrylamide (AcAm). Following dosing with the flocculant, a floc is formed. The floc contains ink and impurities which are removed from the water process stream by means of solid liquid separation; the solid liquid separation comprising a dissolved air flotation method.

Abstract: Flexographic or other printed paper is deinked by a process which comprises pulping in the presence of an emulsion of crosslinked, insoluble, ionisable and swellable polymer particles. The emulsion preferably provides a viscosity (at 3%) in the ionised state of below 50,000 cps (Brookfield RVT) and is novel.

Abstract: A nonionic surfactant having cyclic 1,3-dioxane and/or 1,3-dioxolane functionality which is irreversibly splittable by lowering the pH of its aqueous solution is useful in various processes requiring the removal of emulsified hydrophobic contaminants or other hydrophobic materials from an aqueous stream. After splitting of the surfactant into its component ketone and polyol, the hydrophobic components phase-separate and can be removed from the aqueous stream by routine means.

Abstract: Stickies derived from pulping or deinking of cellulosic material are controlled by adding to the cellulosic liquor containing the stickies an emulsion in water of cross-linked, insoluble, ionisable and swellable polymer particles.

Abstract: The invention relates to the use of dialdehydes and acetals thereof for inhibiting decomposition of peroxide in the production and the treatment of recycled fiber pulp and other fiber pulp.

Abstract: The invention relates to aqueous dispersions containing A. C.sub.6-22 carboxylic acids and/or resinic acids and B. C.sub.6-22 oxoalcohols alkoxylated with 2 to less than 6 mol C.sub.2-4 alkylene oxides for deinking printed wastepaper.

Abstract: A composition containing a persulfate and a carbonate, a bicarbonate or sesquicarbonate, which composition is suitable for oxidizing wet strength resin based broke used in wet strength paper. The combination decreases the time required for effectively repulping broke from such paper. Additionally, the combination is a single product capable of beaking down the wet strength resin and adjusting or maintaining pH at a predetermined value without additional chemical treatment.

Abstract: Describes flotation deinking of secondary fiber using a froth moderating agent, a composition of the froth moderating agent with flotation deinking chemicals, and reducing the amount of stickies in separated secondary fiber. The froth moderating agent is selected from the group consisting of:(a) nonionic surfactant material represented by the formula:R--C.sub.6 H.sub.4 O--(C.sub.2 H.sub.4 O).sub.m --(C.sub.3 H.sub.6 O).sub.n --(C.sub.4 H.sub.8 O).sub.p --R.sup.1wherein R is an aliphatic hydrocarbon group containing from about 5 to 20 carbon atoms, R.sup.1 is selected from the group consisting of chloro, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.

Abstract: There is disclosed a method for recovering fiber from printed wastepaper by loading the wastepaper and water into a continuous batch fiber recovery apparatus. The wastepaper and water are agitated within the apparatus to form a pulp fiber slurry while introducing a deinking/agglomerating composition at predetermined time intervals to cause the ink particles associated with the printed wastepaper to separate from the paper and agglomerate to form large ink particles. The agglomerated ink particles are then removed from the pulp fiber slurry using separation techniques.

Abstract: Compositions comprising polyamine and melamine polymers in certain ratios are provided for coagulating suspended solids in wastewaters such as deinking process waters and raw waters.

Abstract: Deinking agent represented by the following formula (I):R--O--X--H (I)wherein R is derived from a phenolic compound, optionally substituted with a C.sub.6-16 alkyl or alkenyl (linear or branched) group, or from a C.sub.6-16 alkyl or alkenyl (linear or branched) higher alcohol, and X represents a polyalkylene group consisting of at least three units arranged in block and at least one unit arranged at random, with both ends of each random unit adjacent to a block unit, and a method of reclaiming waste paper using same.

Abstract: A process for recovering inorganic material from an effluent suspension produced in the treatment of waste paper. The effluent suspension, in the form of an aqueous suspension containing at least 2% by weight of dry solids, is contacted with an oxygen-containing gas at an elevated temperature, and at an elevated pressure sufficient to keep the water component of the sludge in the liquid phase, for a time sufficient to effect substantially complete oxidation of the organic material in the suspension. The resulting product is dewatered and then resuspended in water, whereafter there is separated from the suspension water containing fine carbon particles in suspension to leave the desired inorganic material.

Abstract: A mill waste or deinking waste or other suspension containing cellulosic material and hydrophobic material is flocculated by a cationic polymeric flocculant and the flocculated material, is then aggregated by a swelling clay or other anionic colloidal material, optionally further cationic flocculant is added, and the aggregated material is then separated by belt pressing or other pressure filtration as a cake.

Abstract: In a method of and an apparatus for regenerating an image support from a used image-bearing support which bears thereon hydrophobic images formed of thermofusible or heat-softening ink, a plurality of image releasing members are used for removing the hydrophobic images from the used image-bearing support. Specifically, at least one of the image releasing members has a first portion which is able to adhere to the hydrophobic images and a second portion which is unable to adhere to the hydrophobic images, and the image releasing members are arranged in series in order of size of the first portion from small to large along a feeding direction of the used image support. Accordingly, the image releasing members are allowed to adhere to the hydrophobic images in order of size of the first portion from small to large so that the hydrophobic images are removed from the used image support effectively.

Abstract: In the deinking of feed waste papers comprising magazines and newspapers at a weight ratio of magazine to newspaper of from 5/95 to 60/40, a reclaimed pulp with excellent qualities can be obtained by adjusting the treating temperature in the flotation step to 40.degree. to 80.degree. C. and adding a deinking agent, which contains an alkylene oxide adduct of an oil or fat, wherein said alkylene oxide adduct comprises ethylene oxide and propylene oxide added at a molar ratio of ethylene oxide to propylene oxide of from 1/1 to 5/1, and has a cloud point of 45.degree. to 90.degree. C., at least in one of the steps of the deinking process.

Abstract: A process for deinking a printed wastepaper pulp slurry comprising:(a) adding to a printed wastepaper pulp slurry a deinking composition consisting essentially of a nonionic ethoxylated and propoxylated surfactant of the formula (I):R--O--(OCH.sub.2 CH.sub.2).sub.n --(OCH.sub.2 CHCH.sub.3).sub.m --(OCH.sub.2 CH.sub.2).sub.q --O--X (I)wherein n is a number from about 1 to about 50, m is a number from about 1 to about 50, q is a number from about 1 to about 50, and R and X are H or an alkyl, alkenyl, or aryl group containing from about 3 to about 35 carbon atoms;(b) washing the slurry in order to obtain a deinked paper pulp suspension and an ink suspension; and(c) separating the deinked paper pulp suspension from the ink suspension.

Abstract: Describes a composition for use in flotation deinking of secondary fiber containing electrostatic ink and/or stickies and optionally conventional impact ink. The composition consists essentially of displector deinking chemicals having an HLB value greater than 10 and non-ionic surfactant deinking additives such as (i) capped aliphatic and alicyclic alkoxylates, e.g., chloride capped C.sub.5 -C.sub.20 alkyl ethoxylates, (ii) alkyl phenol ethoxylates, e.g., octyl phenol ethoxylates, and (iii) a combination of (i) and (ii). Also described is a method for using the composition in a deinking process that includes a flotation step.

Abstract: A process and composition for deinking waste paper is disclosed. The process comprises administering a sufficient amount of a mixture containing (a) an alcohol, randomly alkoxylated with a mixture of alkylene oxides to form a surfactant, (b) a thiol ethoxylate surfactant, and (c) a secondary alcohol alkoxylate, to a sample of waste paper for which treatment is desired. The surfactant enhances the aggregation and densification of electrostatic toner particles, while promoting foaming in the aqueous slurry.

Abstract: Deinking of printed paper is accomplished by repulping and defibering the printed paper in an alkaline aqueous medium containing a deinking composition to form an ink and pulp medium. The deinking composition is an alkoxylated lanolin derivative containing from about 55 to about 80% by weight of ethylene oxide and from about 15 to about 30% by weight of propylene oxide, based on the weight of the alkoxylated lanolin derivative.

Abstract: A process for removing oil-based inks and/or waterborne inks under slightly acidic, neutral or alkaline conditions by using either a flotation technique and/or a washing technique by using a novel deinking agent having a quarternized nitrogen group is provided.

Abstract: A waste paper recycling process relates to the treatment of a mixture of waste paper containing non-cellulosic contraries and printing inks, in order to release the contraries from the fibers and further to separate them from the stock in order to produce re-usable pulp for the production of paper and board.The invention has to do with new and useful improvements in methods for first removing the non-ink contraries from the fibrous mass and second releasing and then removing the ink particles from the said fibrous mass.The invention is directed to the treatment of the fiber slurry produced during the ink separation stage, after the ink releasing stage has been applied. One aim of the process is to allow both the use of the fibers and the mineral fillers contained in that slurry, for pulp and board making, and the use the solids-free water contained in the same slurry as the washing liquid in the previous ink-separation treatment, thus closing the fibers and the water circuits.