Kemira Oyj

Helsinki, Finland

Kemira Oyj

Helsinki, Finland
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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-ionic starch, and at least 0.5 weight-% of anionic polyacrylamide, which has a molecular weight, MW, > 500 000 g/mol and (FR)Linvention concerne une composition pour lencollage dune surface de papier, de carton ou similaire et son utilisation pour augmenter les proprits de rsistance de papier, carton, ou similaire. La composition a une teneur en matires solides de 3 30 %, et il comprend de lamidon non ionique dgrad et au moins 0,5 % en poids de polyacrylamide anionique, qui a un poids molculaire, MW, > 500 000 g/mol et


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. The invention relates also to a use of the strength agent and to a method for increasing strength properties of paper, board or the like.


Patent
Kemira Oyj | Date: 2017-02-15

The invention provides new water soluble polymers for the use in industrial processes, where large quantities of water is handled, such as sludge dewatering and papermaking. These new polymers are water soluble cross-linked block copolymers, wherein the block copolymers are cross-linked together using a cross- linking agent. Each of the block copolymers contain two different blocks, and these blocks are formed from different monomers. The blocks are linked together with a molecular spacer derived from a bifunctional initiator used during the polymerization of said blocks. The monomers used in polymerizing the blocks are different with each other and they are selected from a group consisting of N-vinylformamide, acrylic acid, acrylamide and water-soluble derivatives thereof.


Patent
Kemira Oyj | Date: 2017-07-12

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- t o 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.


Patent
Kemira Oyj | Date: 2017-07-26

An electrolyte membrane suitable for use in an electrochemical cell is de- scribed. 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. Furthermore, the method for preparation and uses thereof are disclosed.


Patent
Kemira Oyj | Date: 2016-11-28

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.


Patent
Kemira Oyj | Date: 2017-05-24

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.


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. The invention relates also to a microfibrillated cellulose obtained by the method and its use.


Patent
Kemira Oyj | Date: 2017-01-04

The invention provides new polyvinylamide and/or acryl acid based copolymers. The new structured block copolymers are based on the block copolymerization of N-vinyl formamide (NVF) with other monomers by using a bifunctional initiator. Further, a method of preparing the structured block copolymer is provided, and especially a method wherein the NVF-based block is at least partially hydrolyzed to obtain PVAm. Also the use of the new structured block copolymers in sludge dewatering and in papermaking processes is disclosed.


Patent
Kemira Oyj | Date: 2017-04-26

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).

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