Patents by Inventor Veli-Matti Vuorenpalo
Veli-Matti Vuorenpalo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230014619Abstract: The invention relates to a method for producing cationized cellulose. The method comprises at least preparing a slurry of a cellulosic starting material in an alkaline liquid medium which comprises an organic liquid and performing mercerization of the slurry. The concentration of the cellulosic starting material in the slurry is at least 20 weight-%, calculated as dry from total weight of the liquid medium and the cellulosic starting material. A cationizing agent is added to the slurry after the mercerization step at a cationization temperature, which is less than the boiling point of the alkaline liquid medium, and the cellulose in the slurry is allowed to react with the cationizing agent, preferably under inert atmosphere and a cationized cellulose product is obtained.Type: ApplicationFiled: December 4, 2020Publication date: January 19, 2023Inventors: Veli-Matti VUORENPALO, Jonni AHLGREN, Jaakko HILTUNEN, Anna-Maija PERANDER, Chunlin XU, Sanna LEHTO, Eija AHONEN, Tarja IKÄVALKO
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Patent number: 11072886Abstract: The present invention relates to a process for treating pulp comprising a step, wherein the pulp is treated with distilled percarboxylic acid, such as distilled per-carboxylic acid (dPAA), and peroxide, such as hydrogen peroxide.Type: GrantFiled: June 27, 2017Date of Patent: July 27, 2021Assignee: KEMIRA OYJInventors: Leif Robertsén, Veli-Matti Vuorenpalo, Anna-Maija Perander, Pentti Pekonen, Jonas Konn
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Patent number: 10513824Abstract: 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. The cellulose pulp is treated after bleaching with performic acid.Type: GrantFiled: May 26, 2016Date of Patent: December 24, 2019Assignee: Kemira OyjInventors: Leif Robertson, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
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Patent number: 10358504Abstract: The present invention relates to a process for producing microcellulose comprising subjecting fibrous cellulosic material to acid hydrolysis at a temperature from 10° C. to less than 140° C. and at a consistency of at least 8% on dry weight of the cellulose, wherein the amount of added acid is from 0.2 to 2%, preferably from 0.3 to 1.9%, more preferably from 0.5 to 1.5% on dry weight of the cellulose.Type: GrantFiled: June 6, 2011Date of Patent: July 23, 2019Assignee: Kemira OYJInventors: Asko Karppi, Veli-Matti Vuorenpalo, Leif Robertsen, Kari Parviainen, Olli Dahl, Kari Vanhatalo
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Patent number: 10329359Abstract: The invention relates to a method for producing microfibrillated cellulose, where a suspension comprising cellulose derivative in a liquid phase which comprises an organic solvent is provided. The suspension of cellulose derivative is mechanically treated and microfibrillated cellulose is obtained. At least a part of the liquid phase from the microfibrillated cellulose is separated and microfibrillated cellulose with a dry solids content of >30 weight-% is obtained.Type: GrantFiled: October 29, 2015Date of Patent: June 25, 2019Assignee: Kemira OyjInventors: Marcus Lillandt, Veli-Matti Vuorenpalo, Kari Vanhatalo
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Publication number: 20190186075Abstract: The present invention relates to a process for treating pulp comprising a step, wherein the pulp is treated with distilled percarboxylic acid, such as distilled per-carboxylic acid (dPAA), and peroxide, such as hydrogen peroxide.Type: ApplicationFiled: June 27, 2017Publication date: June 20, 2019Applicant: KEMIRA OYJInventors: Leif ROBERTSÉN, Veli-Matti VUORENPALO, Anna-Maija PERANDER, Pentti PEKONEN, Jonas KONN
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Patent number: 10113005Abstract: The present invention relates to a method for producing dewatered microfibrillated cellulose (MFC) comprising i) providing an aqueous MFC slurry, ii) optionally dewatering said MFC slurry by mechanical means to provide a partly dewatered MFC slurry, and iii) subjecting the MFC slurry or the partly dewatered MFC slurry to one or more drying operations by means of one or more absorbing materials to produce dewatered MFC. The produced MFC can be redispersed in water without deteriorating the material properties of the MFC.Type: GrantFiled: December 19, 2013Date of Patent: October 30, 2018Assignee: Kemira OyjInventors: Martin Häggblom, Veli-Matti Vuorenpalo
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Publication number: 20180163344Abstract: 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. The cellulose pulp is treated after bleaching with performic acid.Type: ApplicationFiled: May 26, 2016Publication date: June 14, 2018Applicant: Kemira OyjInventors: Leif Robertsen, Veli-Matti Vuorenpalo, Jonas Konn, Kaisa Kaski
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Publication number: 20170313788Abstract: The invention relates to a method for producing microfibrillated cellulose, where a suspension comprising cellulose derivative in a liquid phase which comprises an organic solvent is provided. The suspension of cellulose derivative is mechanically treated and microfibrillated cellulose is obtained. At least a part of the liquid phase from the microfibrillated cellulose is separated and microfibrillated cellulose with a dry solids content of >30 weight-% is obtained.Type: ApplicationFiled: October 29, 2015Publication date: November 2, 2017Applicant: Kemira OyjInventors: Marcus Lillandt, Veli-Matti Vuorenpalo, Kari Vanhatalo
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Patent number: 9587038Abstract: The present invention relates to a process for producing microcellulose comprising a) acidifying fibrous cellulosic material, b) washing the acidified cellulosic material, c) optionally dewatering the washed cellulosic material, and d) hydrolyzing the washed or washed and dewatered cellulosic material under acidic conditions at a temperature of at least 120° C. and at a consistency of at least 8% on dry weight of the cellulose.Type: GrantFiled: June 6, 2011Date of Patent: March 7, 2017Assignee: Kemira OyjInventors: Erkki Iikka Sakari Rasanen, Leif Robertsen, Veli-Matti Vuorenpalo, Asko Karppi, Kari Parviainen, Olli Dahl, Kari Vanhatalo
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Publication number: 20150322170Abstract: The present invention relates to a method for producing dewatered microfibrillated cellulose (MFC) comprising i) providing an aqueous MFC slurry, ii) optionally dewatering said MFC slurry by mechanical means to provide a partly dewatered MFC slurry, and iii) subjecting the MFC slurry or the partly dewatered MFC slurry to one or more drying operations by means of one or more absorbing materials to produce dewatered MFC. The produced MFC can be redispersed in water without deteriorating the material properties of the MFC.Type: ApplicationFiled: December 19, 2013Publication date: November 12, 2015Inventors: Martin HÄGGBLOM, Veli-Matti VUORENPALO
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Publication number: 20140179912Abstract: The present invention relates to a process for producing microcellulose comprising a) acidifying fibrous cellulosic material, b) washing the acidified cellulosic material, c) optionally dewatering the washed cellulosic material, and d) hydrolyzing the washed or washed and dewatered cellulosic material under acidic conditions at a temperature of at least 120° C. and at a consistency of at least 8% on dry weight of the cellulose.Type: ApplicationFiled: June 6, 2011Publication date: June 26, 2014Inventors: Erkki Iikka Sakari Rasanen, Leif Robertsen, Veli-Matti Vuorenpalo, Asko Karppi, Kari Parviainen, Olli Dahl, Kari Vanhatalo
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Publication number: 20140033872Abstract: Binder compositions for agglomerating iron ore fines are provided, the compositions comprising: (a) about 30 to about 80% by weight one or more types of anionic or nonionic acrylamide-containing polymer; (b) about 10 to about 35% by weight one or more types of inorganic or organic monomeric electrolyte; and (c) about 10 to about 35% one or more types of finely ground wood fiber. 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.Type: ApplicationFiled: August 6, 2013Publication date: February 6, 2014Inventors: Mika Martikainen, Matias Penttiinen, Veli-Matti Vuorenpalo, Forrest Strickland, Wayne Bull
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Publication number: 20130112193Abstract: The present invention relates to a process for producing microcellulose comprising subjecting fibrous cellulosic material to acid hydrolysis at a temperature from 10° C. to less than 140° C. and at a consistency of at least 8% on dry weight of the cellulose, wherein the amount of added acid is from 0.2 to 2%, preferably from 0.3 to 1.9%, more preferably from 0.5 to 1.5% on dry weight of the cellulose.Type: ApplicationFiled: June 6, 2011Publication date: May 9, 2013Inventors: Asko Karppi, Veli-Matti Vuorenpalo, Leif Robertsen, Kari Parviainen, Olli Dahl, Kari Vanhatalo
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Publication number: 20110263836Abstract: 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.Type: ApplicationFiled: April 17, 2009Publication date: October 27, 2011Applicant: KEMIRA OYJInventors: Veli-Matti Vuorenpalo, Jaakko Pere, Reijo Aksela, Andrei Tauber
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Publication number: 20070163735Abstract: The present invention concerns a process for reducing the susceptibility of lignocellulosic material to unwanted yellowing, particularly yellowing caused by light and heat. According to the invention, the fibres are activated enzymatically or chemically and then contacted with a modifying agent capable of bonding to the oxidized fibre material, rendering the lignocellulosic fibre material improved resistance to brightness reversion. By means of the invention, brightness reversion caused by light or heat or a combination thereof can be retarded and even stopped.Type: ApplicationFiled: December 23, 2004Publication date: July 19, 2007Applicant: KEMIRA OYJInventors: Johanna Buchert, Liisa Viikari, Stina Gronqvist, Mikael Svedman, Arto Paren, Veli-Matti Vuorenpalo