Kemira Oyj

Kemira Chemicals Oy

Kemira Oy

Jonni Ahlgren

Ilkka Renvall

Jukka Jäkärä

Aarto Parén

Jukka Rautiainen

Tarja Turkki

Sakari Halttunen

Kimmo Strengell

Jukka Jakara

Matti Hietaniemi

Mikko Virtanen

Jaakko Hiltunen

Veli-Matti Vuorenpalo

Timo Härmä

Jussi Nikkarinen

Lars Harald Petander

Reetta Strengell

Marina Shestakova

Timo Korvela

Anna-Maija Perander

Jussi Ruotsalainen

Miia Niemelä

Sai Li

Susann Härkönen

Matias Penttinen

Ilkka Renwall

Bo Hedenas

Maria Luhtala

Tapio Viitanen

Antti Matula

Riitta Laitinen

Seung-Hoon Lee

Juha Rintala

Lars-Ola Berts

Thorbjörn Ahlskog

A treatment system for removing dissolved organic compounds from wastewater, which comprises a water-soluble cationic polymer, and wood-based organic material having an average particle size <10 mm. The invention relates also use of said treatment system for COD removal in the treatment of wastewaters, and a method for removing dissolved organic compounds from wastewater.

Treatment system comprising wood-based organic material and its use in wastewater treatment, and method for removing dissolved organic compounds from wastewater

A water-based barrier coating composition suitable for use as a barrier coating is disclosed which includes an aqueous polymer composition obtainable by free radical (co)polymerizing an ethylenically unsaturated monomer blend having an optionally substituted styrene, at least one C1-C4-alkyl (meth)acrylate, other ethylenically unsaturated copolymerizable monomers, degraded starch polyvinyl alcohol (PVA), a plasticizer; a composition having C16-C18 alkenyl ketene dimer, optionally as a mixture with rosin, of a gelling agent; and optionally a filler.

Water-based barrier coatings

A method for removing humic substances comprising lignin, other lignin type compounds and their disintegration products from an aqueous alkaline waste water from a bleaching of chemical pulp, which method comprises &#x2014;obtaining an aqueous alkaline waste water comprising humic substances such as dissolved lignin, and &#x2014;adding a high cationic starch having a charge density value of at least 1.8 meq/g dry matter of starch derivates determined at pH 7-7.5 to the alkaline waste water to precipitate humic substances.

Method for removing humic substances from an aqueous alkaline solution

The invention relates to a coating color composition for paper and/or paperboard comprising a pigment, optionally known additives used in coating compositions, and a binder substitute comprising styrene acrylate copolymer having mean particle size &#x2266;100 nm. The invention also relates to paper or paperboard coated with a coating color composition according to the invention.

Coating color composition and paper or paperboard coated with it

The invention relates to a method for producing paper, board or the like. In the method is obtained an aqueous filler dispersion, comprising particles of at least one first filler, the filler dispersion having a floc size distribution with original mean chord length value. The particles of the first mineral filler are brought into a contact with a cationic pre-treatment agent, which is capable of initiating flocculation of the filler particles in the dispersion, whereby a pre-treated filler dispersion comprising flocs, which comprise first mineral particles, is formed. The pre-treated filler dispersion is combined with a stock of fibers. The floc size distribution of the filler dispersion is changed with the pre-treatment agent, which is a natural and/or synthetic polymer, so that the mean chord length value increases at least with 2% from the original mean chord length value. The invention relates also to an agglomerate comprising at least one first mineral filler particle, a plurality of second mineral filler particles attached to at least one first filler particle by a pre-treatment agent, which is a natural and/or synthetic polymer. The average particle size by weight of the first mineral filler particles is 1.5-4.0 &#x3bc;m, the average particle size by weight of the second mineral filler particles is 0.5-2.4 &#x3bc;m, provided that the second mineral filler particles are smaller than the first mineral filler particles, and the mean chord length of the agglomerate is &#x3c;40 &#x3bc;m.

Method for producing paper, board or the like and agglomerate

The invention relates to a process for manufacturing paper, in which a filler is pretreated and suspended to form an aqueous slurry, the aqueous slurry obtained is combined with an aqueous suspension containing cellulose fibers to form a stock, the stock obtained is treated at least with a cationic retention agent and the treated stock is filtered to form paper. Retention and optical properties are improved by the filler being pre-treated with inorganic colloidal particles having an average size less than 100 nm.

Process for manufacturing of paper

The present invention relates to a stabilizing composition comprising following components (A) a polymer having following formula wherein Ris a hydrogen atom or an alkyl group containing 1 to 12 carbon atoms, Ris &#x2014;COOM or &#x2014;CHCOOM, M is a hydrogen atom, an alkali metal ion, an alkaline earth metal ion, an ammonium ion or a mixture thereof, n, m and k are molar ratios of corresponding monomers, wherein n is 0 to 0.95, m is 0.05 to 0.9, and k is 0 to 0.8, and (n+m+k) equals 1, and the weight average molecular weight is between 500 and 20,000,000 g/mol, (B) a chelating agent, and (C) an alkaline earth metal compound. The invention also relates to a process for the treatment of a fiber material.

Composition and process for the treatment of fibre material

The invention relates to a process for the treatment of a fibre material comprising the step of contacting the fibre material in an aqueous medium with a chelating agent and a polymer having following general formula wherein The invention also relates to a composition comprising a chelating agent and the above polymer.

Process for the treatment of fibre material and new composition

The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.

Polymer composition for peroxide bleaching of cellulosic fibre material and processes for peroxide bleaching

The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.

Bleaching of cellulosic fibre material with peroxide using polymers as a stabiliser

The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 8, The invention also relates to peroxide bleaching processes.

The invention relates to a method for the production of paper or board, wherein retention aids are added to the stream of stock. Improved retention and more effective dewatering are achieved by adding to the stream of stock a cationic polymer solution and a suspension-form microparticle mixture composed of a swellable clay of the smectite group and a colloidal synthetic metal silicate in which the prevalent cation is magnesium.

Method for production of paper

The invention relates to a process for preparing a cationically modified (meth)acrylamide polymer by the Mannich reaction. There is prepared in advance a stable aldehyde-secondary amine adduct, which is obtained as a reaction product of an aqueous solution of the secondary amine and an aqueous solution of the aldehyde, and which, after the formation of the adduct, is stabilized to endure storage, by lowering the pH of the mixture of 7 or below and/or by adding methanol, and the adduct thus prepared is added to an aqueous solution of the (meth)acrylamide polymer and the pH is adjusted to an alkaline level, whereupon modification occurs. The invention also relates to the use of the modified (meth)acrylamide polymer as a flocculation, retention or dewatering agent.

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Espoo, Finland

Jonni Ahlgren