Abstract: The invention relates to biocidal systems comprising zinc ions and an oxidizing or non-oxidizing biocide, their use, and methods for preventing or decreasing starch degradation in starch-containing process waters from pulp, paper or board production processes.

Abstract: The invention relates to a method for making of paper, tissue, board or the like by using recycled fiber material as a raw material. The method comprises following steps: pulping recycled paper, board or the like in a pulper and obtaining a pulp flow comprising (i) an aqueous phase and (ii) at least recycled fibers and starch having low molecular weight, which are dispersed in the aqueous phase; adding a coagulant agent to the pulp flow or to an aqueous process flow comprising starch having low molecular weight; allowing the coagulant agent to interact with the starch having low molecular weight and optionally forming aggregates; and adding at least one flocculating agent, after the addition of the coagulant agent, to any flow, which comprises interacted coagulant agent, and forming a treated flow with starch comprising agglomerate(s); retaining at least part of the said aggregates and/or the said agglomerates to the fibers or to a web, which is formed.

Abstract: Scale-inhibiting polymers, compositions comprising the scale-inhibiting polymers and methods for preventing scale formation in circulating fluid are provided. The scale-inhibiting polymers comprise two or more recurring monomers wherein in at least one recurring monomer is an allyl-sulfonate-containing monomer, and at least one recurring monomer is a styrene-sulfonate-containing monomer. The polymers, compositions and methods may be used in industrial processes including metal extraction from mineral ores.

Abstract: According to the invention, a method for the prevention of microbial growth in process waters is provided, wherein first a peracid compound, and thereafter a halogenated dialkyl hydantoin are dosed into said process water. Further, according to the invention, a combination for the prevention of microbial growth is provided, said combination comprising compounds to be dosed separately, said compounds being a peracid compound to be dosed first, and a halogenated dialkyl hydantoin to be dosed after the peracid compound, the weight ratio of the peracid compound to the halogenated dialkyl hydantoin being at least 2:1, wherein the amount of the peracid compound is calculated as active agent, while the amount of halogenated dialkyl hydantoin is calculated as active chlorine.

Abstract: The invention relates to an arrangement for simulating creping of tissue. The arrangement comprises a sled with a test surface, which sled is arranged to travel along a linear path; heating means for heating the test surface; a spray unit with at least one spray nozzle, the spray unit being arranged along the linear path of the sled and the at least one spray nozzle being arranged to spray a chemical on the test surface; a creping unit comprising a creping blade, the creping unit arranged along the linear path of the sled after the spray unit and the creping blade arranged to pass over the test surface when the sled passes the creping unit; and measurement means for measuring data related to force between the creping blade and the test surface. The invention relates also to a method for simulating creping of tissue.

Abstract: Described herein are friction reducing polymers comprising two or more recurring units wherein at least one recurring unit is an acrylic acid or acrylamide monomer and at least one recurring unit is a vinyl monomer selected from a vinyl alcohol, a vinyl ester, and a vinyl ether.

Abstract: A process is provided for removing metal salt co-constituents from an iron-containing solution comprising: (a) decreasing the free acidity of the solution to produce a slurry; (b) optionally heating the solution or the slurry to a temperature at least 30° C.; (c) optionally aging the slurry; (d) adding one or more cationic polyelectrolyte flocculants to the slurry; and (e) separating a solid-containing portion from a liquid portion of the slurry.

Abstract: The present invention provides a biocide composition comprising a biocide and a carrier, wherein the biocide is soluble in the carrier. The carrier may comprise polyethylene glycol ester. The present invention also provides a method for controlling biofilms by eliminating and/or preventing microorganisms in an aqueous environment.

Abstract: Described herein are quartz crystal microbalance (QCM) and quartz crystal microbalance with dissipation (QCMD) techniques that can be used for measuring characteristics of a creping adhesive film similar to the creping adhesive film that is formed on a Yankee dryer during the tissue and towel manufacturing process. In addition, exemplary embodiments described herein may use these techniques to predict performance of creping aids utilized to form a creping adhesive film.

Abstract: A well treatment fluid and method of use includes water, at least one hydratable polymer, an optional crosslinking agent, and a delayed release percarbonate formulation effective to reduce initial viscosity of the fluid after a period of time. Also disclosed are processes for fracturing a subterranean formation.

Abstract: The invention relates to a method for improving rheological properties of an aqueous pigment slurry. In the method dispersion agent is added to an aqueous phase of a slurry comprising pigment particles or to the aqueous phase into which the pigment particles are to be added. The dispersion agent comprises styrene acrylate copolymer. The invention relates also to dispersion agent for a pigment slurry comprising a first component comprising styrene acrylate copolymer and a second component comprising a conventional dispersion agent, such as a straight-chain polyacrylate.

Abstract: The invention describes a method and system for controlling the addition rate of a contaminant control chemical to a water or wastewater line. The level of hexavalent chromium as a contaminant in the water or wastewater is measured using a spectro-photometric probe placed in the line. Data representative of the level of measured hexavalent chromium content is read into a computing unit, which determines a required contaminant control chemical addition rate based on said level of hexavalent chromium content. The contaminant control chemical is then added at the required addition rate to reduce the amount of hexavalent chromium to a predetermined level.

Abstract: In various exemplary embodiments described herein, an absorbent structure (e.g., a paper material) having an applied absorbent material (e.g., an absorbent film) may be formed by treating a fiber (e.g., a cellulosic fiber) with an applied absorbent material forming system (also referred to as a “film forming system”), absorbent materials, compositions, methods of making absorbent materials, and the like.

Abstract: The present invention relates to a process for the preparation of a mixture of aspartic acid diethoxy succinate and an amino acid derivative of the general formula (I) wherein n is 1-10, m is 0 or 1, and R is hydrogen or an alkali metal or alkaline earth metal ion, comprising reacting maleate with diethanol amine under alkaline conditions in the presence of a lanthanoid catalyst to form aspartic acid diethoxy succinate followed by adding aspartic acid which reacts with unreacted maleate to form imino disuccinic acid, i.e. an amino acid derivative of formula (I) wherein m is 0, or by adding a diamine derivative of the general formula (II) NH2(CH2)nNH2 wherein n is as defined above, which reacts with unreacted maleate to form an amino acid derivative of formula (I) wherein m is 1 and n is as defined above.

Abstract: The present disclosure relates to a method for controlling size distribution of formed polymer particles during preparation of aqueous polymer dispersion. The method comprises obtaining an aqueous polysaccharide solution, which comprises about 10 to 40 weight-% polysaccharide containing a free hydroxyl group, such as starch, and polymerising in the polysaccharide solution in the presence of a graft-linking, water-soluble redox system about 30 to 60 weight-% of at least one optionally substituted styrene, about 60 to 30 weight-% of at least one C1-C4-alkyl (meth)acrylate, and 0 to about 10 weight-% of other ethylenically unsaturated copolymerizable monomers. The size distribution of the formed polymer particles is controlled by adjusting viscosity of the polysaccharide solution before the polymerisation to a level less than about 20 mPas.

Abstract: Anionic polymers comprising. organic counterfoils exhibit improved biodegradability. The anionic polymers are useful as antiscalants. The biodegradability of an anionic polymer may be improved by replacing inorganic counterions with organic counterions.

Abstract: 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.

Abstract: The present invention relates to a method for recovering lanthanoid catalyst from the preparation of aspartic acid diethoxy succinate comprising contacting a carbonate source with a solution containing lanthanoid ions derived from said preparation and a chelating agent different from aspartic acid diethoxy succinate to precipitate lanthanoid carbonate followed by separating the precipitated lanthanoid carbonate from the solution.

Abstract: The present invention relates to an aqueous preparation comprising a fluorescent dyestuff of a specific formula, water, and optionally a dispersing agent, and the use of the aqueous preparation for dyeing cellulose- or polyamide-containing materials.

Abstract: The invention relates to a method and system for monitoring of particles properties in a stream and the use of such method and system. In particular, the invention concerns sampling of liquids like aqueous suspensions or filtrates that contain solid matter in forest industry, oil and mining industry, as well as in and water treatment, desalination or water reuse processes, and in subsequent measurement of the samples. A sample from a stream of liquid is dyed to stain particles contained in the sample, which is conducted to a first flow chamber having means for causing said sample to be divided into particle populations according to their size or mass. A liquid flow is applied through the first flow chamber to cause at least one particle population to flow into a second flow chamber.