| KEMIRA OYJ Patent applications |
| Patent application number | Title | Published |
|---|
| 20120118523 | Composition and Process for Increasing the Dry Strength of a Paper Product - A dry strength additive composition generally includes an anionic and/or amphoteric polyacrylamide having a molecular weight of less than 1,000,000 Daltons, wherein the amphoteric polyacrylamide has a net negative charge; a cationic and/or amphoteric starch; and a cationic non-starch polymer having a charge density greater than 1 milliequivalent per gram (meq/g) at a pH of 3. The components defining the composition can be added to a pulp suspension sequentially or as a pre-blended mixture. | 05-17-2012 |
| 20120080157 | DEGRADING AGENT COMPOSITIONS FOR TEMPORARY WET STRENGTH SYSTEMS IN TISSUE PRODUCTS - A degrading agent composition for use in manufacturing a tissue product generally includes a degrading agent, a degradation inhibiting carrier, and a non-ionic surfactant. The non-ionic surfactant stabilizes the viscosity of the composition as a function of time. The degrading agent composition can be used in combination with a temporary wet strength agent to produce a tissue product exhibiting high initial wet tensile strength and desirable decay properties. Processes for forming the tissue product and pumpable fluids containing the degrading agent composition are also disclosed. | 04-05-2012 |
| 20120035306 | ANIONIC FUNCTIONAL PROMOTER AND CHARGE CONTROL AGENT WITH IMPROVED WET TO DRY TENSILE STRENGTH RATIO - The invention relates to a composition comprising (a) a functional promoter comprising a water-soluble anionic polymer having a molecular weight of at least about 50,000 daltons and a molecular weight charge index value of at least about 10,000; (b) a cationic surfactant component; such that when the composition treats a fibrous substrate, in conjunction with a cationic strength agent, the treated fibrous substrate exhibits (i) a ratio of wet tensile strength to dry tensile strength ranging from about 1:5 to about 1:2 and (ii) an increase in a ratio of wet tensile strength to dry tensile strength of at least about 10%, as compared to when the fibrous substrate is treated with the functional promoter and without a surfactant. The invention also relates to a paper product made with such a system, and method for imparting wet strength to a paper product with the functional promoter. | 02-09-2012 |
| 20110263836 | METHOD FOR REDUCTION OF LIGHT-INDUCED YELLOWING OF LIGNIN-CONTAINING MATERIAL - A method for treating lignin-containing fibrous material to reduce its susceptibility to yellowing generally includes enzymatically stabilizing the lignin of the material with an oxidizing agent capable of oxidizing phenolic or similar groups, which may undergo reactions conductive to the formation of colored sites on the fibers, and treating the material with a fluorescent whitening agent. Also disclosed are lignin-containing materials obtained by the method. | 10-27-2011 |
| 20110236572 | POLYMER COMPOSITION - A dry coating binder includes a polymer which includes at least 80% by weight of main monomers. The main monomers are selected from C | 09-29-2011 |
| 20110224348 | PROCESS FOR PREPARING A COATING COMPOSITION FOR PAPER AND BOARD - A process for preparing a dry coating composition for paper and board includes mixing at least one pigment and at least one binder and pulverizing the obtained mixture, and wherein 25% to 100% of the pigment has particle size D | 09-15-2011 |
| 20110203485 | BLEACHING METHOD - Methods for treating lignocellulosic material or pigment with a reductive bleaching solution generally include washing the lignocellulosic material or pigment with a reducing agent of magnesium dithionite. The method includes at least one reductive stage and at least one peroxide stage. Also disclosed are methods for preparing dithionite solution wherein magnesium bisulfite is reduced with borohydride solution to obtain dithionite. Bleached lignocellulosic material or pigment obtained with the treatment methods are also disclosed. | 08-25-2011 |
| 20110201748 | CATIONIC POLYMERS CONTAINING 2-HYDROXYALKYL-(METH)ACRYLATES AS PROMOTERS FOR ASA SIZING - The invention relates to polymers useful as a papermaking additives. The invention also relates to methods for making and using such additives. | 08-18-2011 |
| 20110139388 | CATIONIC STARCH GRAFT COPOLYMERS AND NOVEL PROCESS FOR THE PREPARATION OF CATIONIC STARCH GRAFT COPOLYMERS - A cationic starch graft copolymer is prepared by polymerization of monomers a) to d)
| 06-16-2011 |
| 20110137051 | PROCESS FOR RECOVERY OF FORMIC ACID - The invention relates to a process for the recovery of concentrated high purity formic acid having a concentration of at least 50%, most preferably at least 95%, from biomass wherein an aqueous liquid mixture containing levulinic acid and possibly furfural is subjected to a liquid-liquid extraction step, followed by the recovery of furfural, formic acid and levulinic acid. | 06-09-2011 |
| 20110098490 | PROCESS FOR PREPARATION OF FORMATE SALT - Processes for the recovery of formate salt from biomass and the product obtained thereof generally include subjecting an aqueous liquid mixture containing levulinic acid, formic acid and possibly furfural to a liquid-liquid extraction process, followed by the recovery of the furfural, the formate salt and the levulinic acid or the levulinate salt. | 04-28-2011 |
| 20110044883 | METHOD OF PURIFYING GYPSUM - A method of purifying flue gas desulfurization (FGD) gypsum. The method includes the steps of a) providing an aqueous slurry containing said FGD gypsum, b) passing the aqueous slurry to a magnetic separator, and c) contacting the FGD gypsum to be purified with a solution containing an acid and having pH below 5 in an acid washing step. Also, a purified FGD gypsum obtained by the inventive method and the use thereof as coating or filler pigment for paper or board. | 02-24-2011 |
| 20100307706 | REDUCED SHEAR CELLULOSE REACTIVE SIZING AGENT FOR WET END APPLICATIONS - The invention relates to a method for sizing a paper product that involves the steps of (a) providing a paper stock system; (b) forming, in the absence of high shearing forces, an aqueous sizing emulsion comprising an alkenylsuccinic anhydride component; (c) submitting the emulsion formed from step b to a post-dilution step in the presence of a cationic component under conditions, in the absence of high shearing forces, that produce a post-diluted emulsion having improved sizing efficacy; (d) adding the post-diluted emulsion to the paper stock; and (e) forming a paper web. | 12-09-2010 |
| 20100297460 | COMPOSITION AND METHOD FOR TREATING WOOD - According to the invention, wood material is treated with a composition comprising at least one C1-C7 monocarboxylic acid or a salt, or mixtures thereof, and at least one chelating agent. These compounds are dissolved in a liquid aqueous vehicle. In this manner, the treated wood is endowed with excellent resistance against detrimental environmental effects. | 11-25-2010 |
| 20100216934 | GRAFT POLYMER LATEX AND METHOD OF PREPARING - Method of grafting an anionic organic polymer to an organic polymer in latex form, which method comprises forming a water-based mixture of (1) a latex of an organic polymer, (2) an anionic organic polymer, and (3) a free radical initiator, and effecting grafting between said latex polymer and said anionic organic polymer characterized in that the anionic organic polymer is (i) an anionic homopolymer or anionic random copolymer wherein at least 50 mole % of the repeating units are repeating units that bear at least one acid group or acid salt group or (ii) a graft or block copolymer comprising a segment consisting of a anionic homopolymer or anionic random copolymer as defined in (i), and aqueous dispersion comprising graft polymer particles. | 08-26-2010 |
| 20100200499 | METHOD FOR ENZYMATIC TREATMENT OF SLUDGE IN WATER PURIFICATION - The present invention relates to a method for treatment of sludge in water purification, the method comprising the steps: providing an enzyme mixture comprising at least one enzyme capable of digesting natural polymeric materials; and adding the enzyme mixture and at least one chelating reagent, in optional order or simultaneously, to an aqueous sludge suspension. | 08-12-2010 |
| 20100137514 | CATIONIC STARCH GRAFT COPOLYMERS AND NOVEL PROCESS FOR THE PREPARATION OF CATIONIC STARCH GRAFT COPOLYMERS - A cationic starch graft copolymer is prepared by polymerization of monomers a) to d)
| 06-03-2010 |
| 20100108277 | PAPER PRODUCTION WITH MODIFIED SILICA GELS AS MICROPARTICLES - Use of silica sols containing sulfonic acid groups and/or mercapto groups as microparticles in paper production, in particular for paper retention. | 05-06-2010 |
| 20090221704 | PROCESS FOR THE PREPARATION OF PEROXY ACIDS - The present invention relates to a process for the preparation of a solution comprising a first peroxy acid comprising performic acid and a second peroxy acid, said process comprising forming a carboxylic acid solution comprising a first carboxylic acid comprising formic acid, a second carboxylic acid and hydrogen peroxide, wherein the amount of formic acid is from 0.5 to 20% by weight of the amount of the second carboxylic acid, and allowing the components to react to form a solution comprising performic acid and said second peroxy acid, the amount of peroxy acids being at least 5% by weight. The invention also relates to a storable solution comprising performic acid and said second peroxy acid. The solution can be used as a disinfecting agent for controlling micro-organisms. | 09-03-2009 |
| 20090114357 | TEMPORARY WET STRENGTH SYSTEM FOR TISSUE PAPER - The invention relates to a composition comprising a (a) a temporary wet strength agent component capable of forming hemi-acetal bonds with the fibers of a tissue web to provide initial wet strength, subsequent rapid degradation of the initial wet strength when the tissue web contacts water; and (b) a sizing agent component capable of imparting water-repelling properties to the tissue web; such that the strength agent component and the sizing agent component are present in sufficient amounts so that when the composition is added to a tissue pulp slurry during a tissue-making process, tissue made from the tissue-making process exhibits a combination of (1) improved initial wet tensile, (ii) improved decay, and (iii) absorbency. | 05-07-2009 |
| 20090071618 | HIGH-PERFORMANCE STRENGTH RESINS IN PAPERMAKING INDUSTRIES - A composition comprising a functionalized water-soluble, cationic, thermosetting, cellulose reactive polymer with a doubly structured backbone that is the reaction product of: (a) a copolymerized (i) acrylamide component, (ii) cationic co-monomer component and (iii) at least one multifunctional crosslinking monomer component; and (b) a cellulose reactive agent component; such that the acrylamide component, the cationic co-monomer component, the multifunctional crosslinking monomer component, and the cellulose reactive agent component are in an amount sufficient amount to produce a polymer that imparts strength to a fibrous substrate when the polymer is added to paper stock during a papermaking process. The invention also relates to methods for making and using such a composition. | 03-19-2009 |
| 20090032015 | DEPOLYMERIZATION METHOD - The invention relates to a method for depolymerizing starch comprising mixing a starch material with an ionic liquid solvent to dissolve the starch, and then treating the dissolved starch by agitating at a temperature and for a period for time to effect depolymerization of the starch into desired depolymerization products. | 02-05-2009 |
| 20090014695 | Mineral Dispersants and Methods for Preparing Mineral Slurries Using the Same - A mineral slurry comprises mineral particles in an amount equal to or greater than about 60 percent by total weight of the slurry, wherein 85 percent of the mineral particles have an average particle size equal to or less than 2 micrometers; a polyelectrolyte dispersant derived from an acrylate polymer formed by reversible addition-fragmentation chain transfer polymerization, wherein the polyelectrolyte dispersant comprises endgroups comprising thio-containing residues derived from a trithiocarbonate chain transfer agent, wherein the polyelectrolyte dispersant is in an amount less than about 35 pounds of the dispersant per ton of dry mineral particles, and wherein the polyelectrolyte dispersant has a molecular weight of 3000 to 10,000 Daltons and a polydispersity of at least 1.0 and less than 1.5; and the remainder water. | 01-15-2009 |
| 20090010829 | Reducing Agent Composition - The invention relates to a reducing agent composition for use in the catalytic reduction process of nitrogen oxides in exhaust gases, the composition containing 20-40 w % of urea, 19-40 w % of ammonium formate, and water. | 01-08-2009 |
