Patents by Inventor Rein Sikkar
Rein Sikkar 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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Patent number: 7442280Abstract: A process for the production of paper from a suspension containing cellulosic fibers, and optional fillers, which comprises adding to the suspension a drainage and retention aid comprising a cationic organic polymer, forming and dewatering the suspension on a wire, wherein the cationic organic polymer has an aromatic group and the suspension which is dewatered on the wire has a conductivity of at least 2.0 mS/cm.Type: GrantFiled: October 18, 2000Date of Patent: October 28, 2008Assignee: Akzo Nobel NVInventors: Bore Klemets, Hans Hallstrom, Anna Asplund, Rein Sikkar
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Patent number: 7306700Abstract: The present invention relates to a process for the production of paper from a suspension containing cellulosic fibres, and optional fillers, comprising adding to the suspension drainage and retention aids comprising a cationic organic polymer and anionic microparticulate material, forming and dewatering the suspension on a wire, wherein the cationic organic polymer has a non-aromatic hydrophobic group. The invention further relates to a cationic vinyl addition polymer comprising in polymerized form at least one non-cationic monomer having a non-aromatic hydrophobic group and at least one cationic monomer.Type: GrantFiled: April 26, 1999Date of Patent: December 11, 2007Assignee: Akzo Nobel NVInventors: Hans Hällström, Rein Sikkar, Oliver Struck
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Patent number: 6673208Abstract: The present invention relates to polysilicate microgels, their preparation and use in paper making and water purification, the polysilicate microgels being obtainable by a process which comprises bringing into contact (i) particles of a salt AB with an aqueous silicate or polysilicate solution, (ii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the salt AB is precipitating in the aqueous phase, or (iii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the ions A and B represent ions of a precipitable salt AB having a pKS value of at least 4, measured at 20° C. in water. The invention further relates to aqueous silicate or polysilicate solutions, their preparation and use as precursors for polysilicate microgels.Type: GrantFiled: July 1, 2002Date of Patent: January 6, 2004Assignee: Akzo Nobel N.V.Inventors: Michael Persson, Marek Tadeusz Tokarz, Rein Sikkar
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Publication number: 20030017271Abstract: The invention relates to an aqueous slurry or dispersion of pigment particles comprising as dispersant an amphiphilic polymer at least partly adsorbed to the pigment particles, wherein the slurry or dispersion exhibits a temperature dependent viscosity in such way that the viscosity increases at least with a factor of about 2 when the temperature is raised from about 20 up to about 100° C. The invention further relates to a the preparation of the slurry or dispersion, a coating color composition, a process for its preparation, and a process for preparing coated paper or board.Type: ApplicationFiled: June 26, 2002Publication date: January 23, 2003Applicant: AKZO NOBEL N.V.Inventors: Rein Sikkar, Olof Eriksson, Michael Persson
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Publication number: 20020179267Abstract: The present invention relates to polysilicate microgels, their preparation and use in paper making and water purification, the polysilicate microgels being obtainable by a process which comprises bringing into contact (i) particles of a salt AB with an aqueous silicate or polysilicate solution, (ii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the salt AB is precipitating in the aqueous phase, or (iii) an ion A with an ion B in the presence of an aqueous silicate or polysilicate solution, whereby the ions A and B represent ions of a precipitable salt AB having a pKS value of at least 4, measured at 20° C. in water. The invention further relates to aqueous silicate or polysilicate solutions, their preparation and use as precursors for polysilicate microgels.Type: ApplicationFiled: July 1, 2002Publication date: December 5, 2002Inventors: Michael Persson, Marek Tadeusz Tokarz, Rein Sikkar
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Patent number: 6485555Abstract: The present invention relates to sizing of paper and more specifically to a substantially water-free and aqueous composition of a sizing agent where the composition contains a cellulose reactive sizing agent, a cationic compound with a molecular weight up to 10000 and a non-ionic compound. Additionally, the invention relates to the preparation and use of above-mentioned compositions.Type: GrantFiled: December 21, 2001Date of Patent: November 26, 2002Assignee: Akzo Nobel N.V.Inventors: Erik Lindgren, Sten Frölich, Rein Sikkar
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Publication number: 20020139502Abstract: The present invention relates to process for the production of paper from a suspension containing cellulosic fibers, and optional fillers, comprising adding to the suspension drainage and retention aids comprising a cationic organic polymer and anionic microparticulate material, forming and dewatering the suspension on a wire, wherein the cationic organic polymer has a non-aromatic hydrophobic group. The invention further relates to a cationic vinyl addition polymer comprising in polymerized form at least one non-cationic monomer having a non-aromatic hydrophobic group and at least one cationic monomer.Type: ApplicationFiled: March 11, 2002Publication date: October 3, 2002Inventors: Hans Hallstrom, Rein Sikkar, Oliver Struck
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Patent number: 6355141Abstract: A process for the production of paper in which cellulosic fibers are treated with microparticles comprising shell-formed carbon allotrope particles, paper obtainable from this process, and a drainage and/or retention agent comprising at least partially hydrophilic, anionic microparticles comprising shell-formed carbon allotrope particles.Type: GrantFiled: April 23, 1999Date of Patent: March 12, 2002Assignee: Akzo Nobel N.V.Inventors: Rein Sikkar, Michael Persson, Maria Norell
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Patent number: 6306255Abstract: The invention relates to an aqueous disperion containing a cellulose-reactive sizing agent and an anionic hydrophobicailly modified cellulose-derivative, its preparation and use in the production of paper. The invention also relates to a substantially water-free composition containing a cellulose-reactive sizing agent and an anionic hydrophobicailly modified cellulose-derivative, its preparation and use in the preparation of an aqueous dispersion of cellulose-reactive sizing agent. The invention further relates to a process for sizing cellulosic fibers by addition of an aqueous sizing dispersion containing a cellulose-reactive sizing agent and a hydroically modified dispersing agent to a stock containing cellulosic fibers, and optional fillers, and dewatering the stock on a wire to obtain a web containing cellulosic fibers.Type: GrantFiled: May 15, 2000Date of Patent: October 23, 2001Assignee: Akzo Nobel NVInventors: Sten Frölich, Erik Lindgren, Rein Sikkar
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Patent number: 6165259Abstract: The invention relates to an aqueous dispersion containing a dispersant and a disperse phase containing a hydrophobic material, the dispersant comprising an anionic compound having a molecular weight less than 50,000 and being selected from the group consisting of carbon-containing compounds and silicon-containing compounds, and a cationic organic compound having a molecular weight less than 50,000. The invention further relates to the preparation and use of the dispersion in the production of paper. The invention also relates to a substantially water-free composition containing a hydrophobic material, an anionic compound having a molecular weight less than 50,000 and being selected from carbon-containing compounds and silicon-containing compounds, and a cationic organic compound having a molecular weight less than 50,000, as well as it use in the preparation of an aqueous dispersion.Type: GrantFiled: February 3, 1998Date of Patent: December 26, 2000Assignee: Akzo Nobel N.V.Inventors: Hans Hallstrom, Sten Frolich, Erik Lindgren, Rein Sikkar
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Patent number: 6093217Abstract: The invention relates to an aqueous dispersion containing a cellulose-reactive sizing agent and an anionic hydrophobically modified cellulose-derivative, its preparation and use in the production of paper. The invention also relates to a substantially water-free composition containing a cellulose-reactive sizing agent and an anionic hydrophobicity modified cellulose-derivative, its preparation and use in the preparation of an aqueous dispersion cellulose-reactive sizing agent. The invention further relates to a process for sizing cellulosic fibers by addition of an aqueous sizing dispersion containing a cellulose-reactive sizing agent and a hydrophobically modified dispersing agent to a stock containing cellulosic fibers, and optional fillers, and dewatering the stock on a wire to obtain a web containing cellulosic fibers.Type: GrantFiled: February 3, 1998Date of Patent: July 25, 2000Assignee: Akzo Nobel N.V.Inventors: Sten Frolich, Erik Lindgren, Rein Sikkar
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Patent number: 5969011Abstract: The invention relates to an aqueous dispersion containing a cellulose-reactive sizing agent and a dispersant system comprising a low molecular weight cationic organic compound having a molecular weight less than 10,000 and an anionic stabilizer, its preparation and use in the production of paper. The invention further relates to a substantially water-free composition containing a cellulose-reactive sizing agent, a low molecular weight cationic organic compound having a molecular weight less than 10,000 and an anionic stabilizer, its preparation and use in the preparation of an aqueous dispersion of cellulose-reactive sizing agent.Type: GrantFiled: February 3, 1998Date of Patent: October 19, 1999Assignee: Akzo Nobel nvInventors: Sten Frolich, Erik Lindgren, Rein Sikkar
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Patent number: 5037477Abstract: The invention relates to a process for the preparation of an acid-resistant coating and calcium carbonate particles, in which process a slurry of calcium carbonate particles is mixed simultaneously with the solution of a zinc compound and a solution of a silica-containing substance at a temperature of 70.degree.-95.degree. C., the pH being maintained at 8-11.The invention also relates to calcium carbonate particles having an acid-resistant coating in accordance with the above-mentioned process.In addition, the invention relates to the use of calcium carbonate particles having a acid-resistant coating in accordance with the above-mentioned process, as an acid-resistant filler in the production of paper at pH 4.0-7.0.Type: GrantFiled: October 25, 1990Date of Patent: August 6, 1991Assignee: Eka Nobel ABInventors: Marek Tokarz, Sven Jaras, Rein Sikkar
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Patent number: 5000791Abstract: The invention relates to a process for the preparation of an acid-resistant coating and calcium carbonate particles, in which process a slurry of calcium carbonate particles is mixed simultaneously with the solution of a zinc compound and a solution of a silica-containing substance at a temperature of 70.degree.-95.degree. C., the pH being maintained at 8-11.The invention also relates to calcium carbonate particles having an acid-resistant coating in accordance with the above-mentioned process.In addition, the invention relates to the use of calcium carbonate particles having a acid-resistant coating in accordance with the above-mentioned process, as an acid-resistant filler in the production of paper at pH 4.0-7.0.Type: GrantFiled: July 20, 1989Date of Patent: March 19, 1991Assignee: Eka Nobel ABInventors: Marek Tokarz, Sven Jaras, Rein Sikkar