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Kemira Oyj patents


Recent patent applications related to Kemira Oyj. Kemira Oyj is listed as an Agent/Assignee. Note: Kemira Oyj may have other listings under different names/spellings. We're not affiliated with Kemira Oyj, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "K" | Kemira Oyj-related inventors


A method for producing a material with a network of at least two polymers, a product thereof and use of the product

The present invention relates to an interpenetrating polymer network (ipn) material comprising a copolymer of vinylamine-vinylformamide, and a homo-polymer or a copolymer of at least one monomer selected from acrylamide or derivatives thereof, acrylic acid or derivatives thereof, or a mixture thereof forming the ipn material together with the copolymer of vinylamine-vinyl-formamide. The present invention further relates to a process for producing the ipn material, and to use of the ipn material in paper industry.. ... Kemira Oyj

Method for controlling hydrophobic particles in aqueous environment in paper or board manufacture

The invention relates to a method for controlling hydrophobic particles in aqueous environment in paper or board manufacture. The method comprises preparing an aqueous stock comprising natural fibrous material, feeding the stock to a wire section, where a fibrous web is formed by draining excess water through a wire, and adding a control chemical to aqueous environment at least in one dosage point between the preparation of the stock and the exit of the web from the wire section. ... Kemira Oyj

Method for reducing pulp viscosity in production of dissolving pulp

The invention relates to a method for reducing pulp viscosity in production of dissolving pulp. The method comprises producing cellulose pulp, whereby the obtained cellulose pulp has a cellulose content of at least 90%, and bleaching the obtained cellulose pulp. ... Kemira Oyj

Method for producing polyacrylamide composition

Disclosed is a method for producing an aldehyde crosslinked polyacrylamide composition useful for strengthening paper. The method includes steps, wherein a) an aldehyde crosslinker and polyacrylamide are mixed in water to form an aqueous solution of aldehyde crosslinked polyacrylamide prepolymer; b) acid is added to the aqueous prepolymer solution to adjust the ph of the solution to a value from 1 to 5; c) storing and transporting the prepolymer solution to the location where the final glyoxalated polyacrylamide composition will be used; and d) adding a base to the stabilized prepolymer solution to adjust the ph of the solution to a value from 5.5 to 12, and e) allowing the aldehyde crosslinker and polyacrylamide contained in the aldehyde crosslinked polyacrylamide prepolymer solution to react further and form aldehyde crosslinked polyacrylamide composition useful for strengthening paper.. ... Kemira Oyj

Surfactant composition and method for treating bitumen froth

The invention relates to a surfactant composition comprising an ionic liquid prepared from an unsubsituted or substituted primary, secondary or tertiary amine, or from an unsubstituted or substituted pyridine, amidine or guanidine with at least one fatty acid and/or resin acid. The invention also relates to a method for treating bitumen froth from a separation process, where bitumen is separated from mineral solids. ... Kemira Oyj

Use of a strength composition for increasing wet dimensional stability of a moulded pulp article

The invention relates to a use of a strength composition for increasing wet dimensional stability of a moulded pulp article. The moulded pulp article is produced by a method which comprises obtaining a fibre slurry and feeding it to a forming tank of a moulding apparatus, forming a moulded pulp article from the fibre slurry, and drying the moulded pulp article. ... Kemira Oyj

A composition for use as a paper strength agent

The present disclosure relates to a method and composition for increasing wet and/or dry strength of a paper product. The method comprises adding a composition comprising at least one polymer having a molecular weight more than 0.5 million dalton and a degradation agent to a pulp suspension, and forming said paper product.. ... Kemira Oyj

Softener composition

A softener composition for use in the manufacture of paper includes a softener and an acidic material, wherein the softener composition has a relative acidity (ra) value of more than 0.05.. . ... Kemira Oyj

Compositions of dry acid polymers and uses thereof

The present embodiments generally relate to the use of one or more polymers, e.g., one or more dry acid polymers and/or one or more dry acid polymers with salt, as flocculants, generally for treating tailings, e.g., oil sands tailings, in need of solid-liquid separation, e.g., in order to efficiently recycle water and/or to reduce the volume of tailings which may be transferred to a tailings pond and/or a dedicated disposal area.. . ... Kemira Oyj

Defoaming compositions and processes for drilling fluid applications

Compositions and processes for breaking or reducing foam in a drilling fluid, or improving the disposal of a drilling fluid, or reducing or preventing entrained gas in a drilling fluid. The compositions include a defoaming composition comprising hydrophobic silica and an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer.. ... Kemira Oyj

Agglomerated hemicellulose compositions, methods of preparation thereof, and processes for enriching a desired mineral from an ore

Methods for preparing agglomerated hemicellulose compositions are provided. Agglomerated hemicellulose compositions comprising agglomerates are also provided herein. ... Kemira Oyj

Depressants for mineral ore flotation

Depressants comprising a polymer comprising: a) recurring units of one or more acrylamide monomers; b) recurring units of one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate; and optionally, c) recurring units of one or more acrylic acid monomers are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more of the depressants.. ... Kemira Oyj

Method for producing paper

A method for manufacturing paper is disclosed. A pulp slurry is produced, a paper sheet is formed from the slurry, an aldehyde functionalized polymer or polymers is added to the slurry before and/or after sheet formation, and a water soluble acid is added on the paper sheet.. ... Kemira Oyj

Method for quantitative monitoring of endospores in aqueous environment of a paper or board mill

The invention relates to a method for quantitative monitoring of bacterial endospores in an aqueous environment of a paper or board mill. The method comprises at least the following steps: obtaining at least a first aqueous sample originating from the industrial aqueous environment; destroying bacteria in vegetative form in the first sample by a suitable treatment, preferably by heating the first sample to a desired temperature; adding intercalating agent (such as pma) to the treated first sample and allowing it to interact (e.g. ... Kemira Oyj

02/08/18 / #20180036743

Processes for mineral ore flotation in the presence of multivalent metal ions

Processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, are provided, wherein the process comprises carrying out a flotation process in the presence of one or more chelating agents, one or more collecting agents, one or more types of multivalent metal ions, and optionally, one or more depressants, in a solution, wherein the one or more chelating agents are capable, alone or as a group of compounds, of sequestering a metal or metal ion in the form of a metal-chelating agent complex that remains at least partially soluble in the solution.. . ... Kemira Oyj

01/25/18 / #20180023253

A method for producing interpenetrating polymer network material, a product thereof and use of the product

The present invention relates to an interpenetrating polymer network (ipn) material comprising microcrystalline cellulose (mcc), microfib-rillated cellulose (mfc) or a mixture thereof, and at least one polymer forming an ipn together with the mcc, mfc or mixture thereof. The present invention further relates to a process for producing the ipn material, and to use of the ipn material in paper industry.. ... Kemira Oyj

01/25/18 / #20180023167

Binder compositions and processes of preparing iron ore pellets

Binder compositions for agglomerating iron ore fines are provided, the compositions comprising: one or more types of modified starch and one or more types of synthetic dry polymers. A process for preparing iron ore pellets with the binder compositions is also provided, the process comprising: (i) adding a binder composition to particulate iron ore to form a mixture; and (ii) forming the mixture into pellets.. ... Kemira Oyj

01/18/18 / #20180017494

Method for analysing a sample comprising at least a first and a second scale inhibitor

The invention relates to a method for analysing a sample comprising at least a first and a second scale inhibitor, which scale inhibitors are synthetic organic compounds comprising at least one ionised group. The method comprises optionally diluting and/or purifying the sample, and allowing the sample interact with a reagent comprising lanthanide(iii) ion. ... Kemira Oyj

01/18/18 / #20180016746

Polymer product in particle form and its use

The invention relates to a water-soluble polymer product in particle form, comprising amphoteric polyacrylamide, which is obtained by gel polymerisation of acrylamide together with anionic and cationic monomers. The amphoteric polyacrylamide has a mass average molecular weight mw of 1500000-6000000 g/mol, and a total ionicity of 4-15 mol-%, whereby the polymer product has a polymer content of at least 60 weight-%. ... Kemira Oyj

01/04/18 / #20180002608

Processes for treating tailings streams

Provided are processes for treating a tailings stream which comprises water and solids, the process comprising: (i) adding one or more anionic polymer flocculants and one or more nonionic polymer flocculants to the tailings stream; (ii) allowing at least a portion of the solids to flocculate; and (iii) separating at least a portion of the flocculated solids from the tailings stream.. . ... Kemira Oyj

12/28/17 / #20170368480

Selective flocculants for mineral ore benefication

Selective flocculants comprise a polymer comprising recurring units of one or more acrylamide monomers; recurring units of one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate; and optionally, recurring units of one or more acrylic acid monomers. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a selective flocculation process in the presence of one or more of the selective flocculants.. ... Kemira Oyj

12/21/17 / #20170362489

Emulsions containing alkyl ether sulfates and uses thereof

Emulsions, treatment fluids and methods for treating subterranean formations are provided, wherein the emulsions comprise water, a water-immiscible liquid, one or more polymers, and an inverting surfactant composition comprising one or more salts of alkyl ether sulfates, one or more ethoxylated amine compounds and one or more organic or inorganic salts. The emulsions are particularly suitable for use in harsh brine conditions.. ... Kemira Oyj

12/21/17 / #20170362487

Emulsions, treatment fluids and methods for treating subterranean formations

Emulsions, treatment fluids and methods for treating subterranean formations are provided, wherein the emulsions comprise water, a water-immiscible liquid, one or more polymers, one or more ethoxylated amine compounds and optionally, one or more organic or inorganic salts. The emulsions are particularly suitable for use in harsh brine conditions.. ... Kemira Oyj

11/30/17 / #20170341958

Real-time dewatering optimization

The present invention relates to a system (17) for real-time monitoring and/or controlling wastewater or sludge dewatering and/or thickening processes, said system (17) comprising a wastewater piping (13) comprising a wastewater inlet (1) and a concentrated wastewater outlet (18); at least one dewatering or thickening device (14), attached to said wastewater piping (13) between the inlet (1) and the outlet (18); at least one total solids measurement device (2, 8, 11), attached to said wastewater piping (13); at least one total suspended solids measurement device (3, 7, 10), attached to said wastewater piping (13) or a fluid outlet (9) of the dewatering or thickening device (14); an inorganic coagulant container (4) connected to said wastewater piping (13); a feeding valve (5) to control a flow of inorganic coagulant from said inorganic coagulant container (4) to said wastewater piping (13); and a control unit (15); wherein the flow of inorganic coagulant is adapted to be controlled to uphold at least a predetermined set point value (tds1) in relation to the value measured by said total solids (ts) measurement device, and the value measured by said total suspended solids (tss) measurement device. The present invention further relates to a method for controlling said system and the use of the system for monitoring and/or controlling a wastewater dewatering and/or thickening process.. ... Kemira Oyj

11/09/17 / #20170320979

Method for preparing a dry cationic hydrogel polymer product, polymer product and its use

The invention relates to a method for preparing a dry cationic hydrogel polymer product. The method comprises polymerisation of a reaction mixture comprising ethylenically unsaturated monomers in presence of water and initiator(s) by radical polymerisation and obtaining a hydrogel polymer. ... Kemira Oyj

10/05/17 / #20170288250

An electrolyte membrane for use in an electrochemical cell

An electrolyte membrane suitable for use in an electrochemical cell is described. It comprises a polymer electrolyte body and at least one metal oxide thin film layer on at least one surface of the polymer electrolyte body, wherein said metal oxide thin film layer is permeable to protons. ... Kemira Oyj

10/05/17 / #20170284028

Sizing composition, its use and a method for producing paper, board or the like

The invention relates to a composition for sizing of a surface of paper, board or the like and its use for increasing strength properties of paper, board or the like. The composition has a solids content of 3-30%, and it comprises degraded non-ion is starch, and at least 0.5 weight-% of anionic polyacrylamide, which has a molecular weight, mw, >500 000 g/mol and <2 500 000 g/mol and an anionicity in the range of 4-35 mol-%. ... Kemira Oyj

10/05/17 / #20170283515

Methods of preparing hemicellulose compositions

Multi-extraction methods for preparing hemicellulose compositions are provided. Depressant compositions comprising hemicellulose compositions are also provided herein. ... Kemira Oyj

09/28/17 / #20170275192

Method for nitrogen removal from aqueous medium

The invention relates to a method for nitrogen removal from aqueous medium, comprising steps of (a) converting nh4+ in the aqueous medium to no2− by partial aerobic nitrification, (b) partially reducing the obtained no2− to n2o in anoxic conditions, and (c) decomposing n2o to n2 with energy recovery. A mixture of ferrous sulfate and ferric sulfate is used in step (b) for reduction of no2− to n2o.. ... Kemira Oyj

09/21/17 / #20170268176

Strength agent, its use and method for increasing strength properties of paper

The invention relates to a strength agent for paper, board or the like. The strength agent comprises a first component, which is refined cellulosic fibres having a refining level of >70° sr, and a second component, which is a synthetic cationic polymer having a charge density of 0.1-2.5 meq/g, determined at ph 2.7, and an average molecular weight of >300 000 g/mol. ... Kemira Oyj

08/24/17 / #20170240661

Polymer product, method for producing the polymer and use of the polymer

The present invention relates to a method for producing a cationic polyvinyl amine based copolymer. The present invention further relates to a cationic polyvinyl amine based copolymer and use of the copolymer in paper industry as a strength agent, a retention agent and a drainage agent.. ... Kemira Oyj

07/13/17 / #20170198435

Method for preventing scale formation

The present invention provides a method for preventing or decreasing scale formation on process surfaces in manufacturing process of paper, board or the like, in which method performic acid is used as an antiscaling agent.. . ... Kemira Oyj

06/29/17 / #20170183555

Method for producing a suspension of microfibrillated cellulose, microfibrillated cellulose and its use

The invention relates a method for producing a suspension of microfibrillated cellulose. The method comprises at least the steps of obtaining an aqueous suspension of natural cellulose fibres, adding an additive consisting of at least one natural polymer to the suspension of natural cellulose fibres, and feeding the obtained mixture comprising natural cellulose fibres and the additive into a homogenizer or a fluidizer. ... Kemira Oyj

06/15/17 / #20170166799

Defoaming compositions and processes for cementing applications

Cement compositions and processes for reducing air entrainment in a cement composition generally include mixing a hydraulic cement with a defoamer composition including an organic acid ester of a polyoxyethylene-polyoxypropylene block copolymer.. . ... Kemira Oyj

05/11/17 / #20170130135

Method for separating hydrocarbons and use of molten salt

The invention relates to a use of a reversible molten salt for separating hydrocarbons, such as crude bitumen and/or heavy crude oil, from material comprising mineral solids. The invention relates also to a method comprising at least the steps of: (a) bringing a liquid phase comprising a reversible molten salt, preferably a reversible ionic liquid, in a contact with mineral solids comprising hydrocarbons and extracting hydrocarbons to the liquid phase from the mineral solids; (b) separating the mineral solids phase from the liquid phase, which comprises molten salt and hydrocarbons; (c) separating hydrocarbons from the liquid phase comprising molten salt; and (d) recycling the liquid phase comprising molten salt to step (a).. ... Kemira Oyj

04/13/17 / #20170100724

Moderately oxidized polysaccharide depressants for use in iron ore flotation processes

Depressants comprising a moderately oxidized polysaccharide having about 0.05 to about 4.5 mmol of anionic charge per gram at a ph of about 6 to about 7, or about 0.2 to about 5 mmol of anionic charge per gram at a ph of about 10 to about 11.2, are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more of the depressants.. ... Kemira Oyj

03/30/17 / #20170089011

Compositions and methods of making paper products

Paper strength systems including polyamine-polyamidoamine-epihalohydrin (ppae) resin are disclosed. Also disclosed are methods of forming a paper including applying a strength system comprising ppae to cellulosic fiber, as well as the resultant paper.. ... Kemira Oyj

03/02/17 / #20170058255

Bacterial strain rhodococcus aetherivorans vkm ac-2610d producing nitrile hydratase, method of its cultivation and method for producing acrylamide

The invention relates to a bacterial strain belonging to the genus rhodococcus which is a producer of a nitrile hydratase. The invention also relates to a method for producing acrylamide by hydration of acrylonitrile using a biomass of the bacterial strain and to a method of culturing the bacterial strain.. ... Kemira Oyj

01/05/17 / #20170002519

Method for producing polyacrylamide composition

Disclosed is a method for producing an aldehyde crosslinked polyacrylamide composition useful for strengthening paper. The method includes steps, wherein a) an aldehyde crosslinker and polyacrylamide are mixed in water to form an aqueous solution of aldehyde crosslinked polyacrylamide prepolymer; b) acid is added to the aqueous prepolymer solution to adjust the ph of the solution to a value between 1 to 5; c) storing and transporting the prepolymer solution to the location where the final glyoxalated polyacrylamide composition will be used; and d) adding a base to the stabilized prepolymer solution to adjust the ph of the solution to value between 5.5 to 12, and e) allowing the aldehyde crosslinker and polyacrylamide contained in the aldehyde crosslinked polyacrylamide prepolymer solution to react further and form aldehyde crosslinked polyacrylamide composition useful for strengthening paper.. ... Kemira Oyj

01/05/17 / #20170002518

Papermaking agent composition and method for treating fibre stock

The invention relates to a papermaking agent composition, preferably in powder form, which comprises a water-soluble polymer, which comprises 21-30 mol-% of vinylamine units and has an average molecular weight of at least 1 000 000 da. The invention relates also to a method for treating of fibre stock in manufacture of paper, board or the like, where a thick fibre stock is obtained, it is diluted to a thin fibre stock having a consistency <3% by addition of water, and the thin fibre stock is drained and a continuous fibrous web is formed. ... Kemira Oyj








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