Patents by Inventor Marek Tokarz

Marek Tokarz 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).

  • Patent number: 8835515
    Abstract: An aqueous sol containing silica-based particles which sol has a specific surface area of at least 115 m2/g aqueous sol and a pH of at least 10.5, and an S-value within the range of from 10 to 45% and/or contains silica-based particles having a specific surface area of at least 550 and less than about 1200 m2/g SiO2, and wherein the sol is substantially free from aluminium.
    Type: Grant
    Filed: April 4, 2011
    Date of Patent: September 16, 2014
    Assignee: Akzo Nobel, N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren, Hans Erik Johansson-Vestin
  • Patent number: 8568565
    Abstract: The present invention relates to a silica-based sol having a concentration of soluble silica of less than about 1000 mg SiO2/l, conductivity of at least about 2.0 mS/cm and S-value below about 50%. The invention further relates to a method of producing a silica-based sol comprising subjecting an aqueous alkali metal silicate solution to electrodialysis to form an electrodialyzed sol, and acidifying the electrodialyzed sol to form an acidified sol having a pH in the range of from about 5.0 to about 10. The invention further relates to silica-based sol obtainable by the process and to the use of the silica-based sol as a flocculating agent. The invention further relates to a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibers, adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention, and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: October 29, 2013
    Assignee: Akzo Nobel N.V.
    Inventors: Marek Tokarz, Hans-Åke Baltsen
  • Patent number: 8157962
    Abstract: The present invention relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight; adding to the thick suspension an aluminum compound, alkaline earth metal salt and acid; diluting the obtained thick suspension to form a thin suspension; adding to the thin suspension one or more drainage and retention aids; and dewatering the obtained thin suspension. The invention further relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight and an alkaline earth metal ion concentration of at least about 100 mg/l; adding to the thick suspension an aluminum compound and optionally an acid to obtain a pH of from about 4 to about 5.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: April 17, 2012
    Assignee: Akzo Nobel N.V.
    Inventors: Patrik Simonson, Marek Tokarz, Katarina Gutke
  • Publication number: 20110247774
    Abstract: The present invention relates to a silica-based sol having a concentration of soluble silica of less than about 1000 mg SiO2/l, conductivity of at least about 2.0 mS/cm and S-value below about 50%. The invention further relates to a method of producing a silica-based sol comprising subjecting an aqueous alkali metal silicate solution to electrodialysis to form an electrodialyzed sol, and acidifying the electrodialyzed sol to form an acidified sol having a pH in the range of from about 5.0 to about 10. The invention further relates to silica-based sol obtainable by the process and to the use of the silica-based sol as a flocculating agent. The invention further relates to a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibers, adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention, and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Application
    Filed: July 10, 2009
    Publication date: October 13, 2011
    Applicant: AKZO NOBEL N.V.
    Inventors: Marek Tokarz, Hans-Ake Baltsen
  • Publication number: 20110196047
    Abstract: A process for the production of an aqueous sol containing silica-based particles which comprises (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight; (c) allowing particle growth of the alkalised sol for at least 10 minutes; or heat-treating the alkalised sol at a temperature of a least 30° C.; (d) alkalising the obtained sol to a pH of at least 10.0; and (e) optionally concentrating the sol obtained according to (b), (c) or (d) to provide an aqueous sol containing silica-based particles and having a specific surface area of at least 90 m2/g aqueous sol; as well as an aqueous sol containing silica-based particles obtainable by the process.
    Type: Application
    Filed: April 4, 2011
    Publication date: August 11, 2011
    Applicant: AKZO NOBEL N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren, Hans Johansson-Vestin
  • Patent number: 7919535
    Abstract: The invention relates to an aqueous sol containing silica-based particles which sol has a specific surface area of at least 115 m2/g aqueous sol and an S-value within the range of from 10 to 45% or contains silica-based particles having a specific surface area of at least 550 m2/g and less than 1000 m2/g SiO2. The invention further relates to processes for the production of said aqueous sol and the use of the aqueous sol containing silica-based particles as a drainage and retention aid in the production of paper as well as a process for the production of paper from an aqueous suspension containing cellulosic fibres, and optional filler, in which silica-based particles and at least one charged organic polymer are added to the cellulosic suspension.
    Type: Grant
    Filed: January 8, 2005
    Date of Patent: April 5, 2011
    Assignee: Akzo Nobel N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren, Hans Johansson-Vestin
  • Patent number: 7893114
    Abstract: The invention relates to a process for producing aqueous silica-based sols which comprises providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; adjusting the pH of the aqueous slurry and separating the ion exchange resin from the aqueous slurry, as well as the silica-based sols obtained by the process; the invention also relates to silica-based sols obtained by the process, as well as a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibres; adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: February 22, 2011
    Assignee: Akzo Nobel N.V.
    Inventors: Glenn Mankin, Marek Tokarz, Freddie Hansson
  • Publication number: 20100236738
    Abstract: The invention relates to a process for producing aqueous silica-based sols which comprises providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; adjusting the pH of the aqueous slurry and separating the ion exchange resin from the aqueous slurry, as well as the silica-based sols obtained by the process. The invention also relates to silica-based sols obtained by the process, as well as a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibres; adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Application
    Filed: June 2, 2010
    Publication date: September 23, 2010
    Applicant: AKZO NOBEL N.V
    Inventors: Glenn Mankin, Marek Tokarz, Freddie Hansson
  • Patent number: 7732495
    Abstract: The invention relates to a process for producing aqueous silica-based sols which comprises providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; adjusting the pH of the aqueous slurry and separating the ion exchange resin from the aqueous slurry, as well as the silica-based sols obtained by the process. The invention also relates to silica-based sols obtained by the process, as well as a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibres; adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Grant
    Filed: April 7, 2005
    Date of Patent: June 8, 2010
    Assignee: Akzo Nobel N.V.
    Inventors: Glenn Mankin, Marek Tokarz, Freddie Hansson
  • Patent number: 7670460
    Abstract: A process for the production of paper which includes the steps of providing an aqueous suspension containing cellulosic fibers, and optional fillers; adding to the suspension: (a) at least one charged organic polymer; and (b) an aqueous sol containing silica-based particles; wherein the sol has: (i) an S-value within the range of from 10 to 45%; (ii) a viscosity within the range of from 5 to 40 cP; and (iii) a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1; and (III) forming and draining the suspension on a wire.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 2, 2010
    Assignee: Akzo Nobel N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren
  • Publication number: 20100032117
    Abstract: The present invention relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight; adding to the thick suspension an aluminum compound, alkaline earth metal salt and acid; diluting the obtained thick suspension to form a thin suspension; adding to the thin suspension one or more drainage and retention aids; and dewatering the obtained thin suspension. The invention further relates to a process for the production of a cellulosic product which comprises providing an aqueous thick suspension containing cellulosic fibers having a fiber concentration of at least about 2% by weight and an alkaline earth metal ion concentration of at least about 100 mg/l; adding to the thick suspension an aluminum compound and optionally an acid to obtain a pH of from about 4 to about 5.
    Type: Application
    Filed: December 18, 2007
    Publication date: February 11, 2010
    Applicant: Akzo Nobel N.V.
    Inventors: Patrik Simonson, Marek Tokarz, Katarina Gutke
  • Publication number: 20080011438
    Abstract: The present invention relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a clay having 3R2 stacking; and (iii) dewatering the obtained suspension. The invention also relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a cationic clay; (iii) adding to the suspension one or more drainage and retention aids comprising at least one cationic polymer; and (iv) dewatering the obtained suspension. The invention further relates to a cellulosic product comprising clay having 3R2 stacking.
    Type: Application
    Filed: July 25, 2007
    Publication date: January 17, 2008
    Applicant: Akzo Nobel N.V.
    Inventors: Marek Tokarz, Jerker Nilsson
  • Patent number: 7303654
    Abstract: The present invention relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a clay having 3R2 stacking; and (iii) dewatering the obtained suspension. The invention also relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a cationic clay; (iii) adding to the suspension one or more drainage and retention aids comprising at least one cationic polymer; and (iv) dewatering the obtained suspension. The invention further relates to a cellulosic product comprising clay having 3R2 stacking.
    Type: Grant
    Filed: November 18, 2003
    Date of Patent: December 4, 2007
    Assignee: AKZO Nobel N.V.
    Inventors: Marek Tokarz, Jerker Nilsson
  • Publication number: 20070095493
    Abstract: A process for the production of paper which includes the steps of providing an aqueous suspension containing cellulosic fibers, and optional fillers; adding to the suspension: (a) at least one charged organic polymer; and (b) an aqueous sol containing silica-based particles; wherein the sol has: (i) an S-value within the range of from 10 to 45%; (ii) a viscosity within the range of from 5 to 40 cP; and (iii) a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1; and (III) forming and draining the suspension on a wire.
    Type: Application
    Filed: December 20, 2006
    Publication date: May 3, 2007
    Applicant: AKZO NOBEL N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren
  • Patent number: 7169261
    Abstract: An aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45%, a viscosity within the range of from 5 to 40 cP, and a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1, or a silica content of at least 10% by weight. The invention further relates to a process for the production of silica-based particles comprising the steps of: (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight to; (c) allowing particle growth of the alkalised sol for at least 10 minutes, or heat-treating the alkalised sol at a temperature of a least 30° C.; and then (d) alkalising the obtained sol to a pH of at least 10.0.
    Type: Grant
    Filed: November 5, 2001
    Date of Patent: January 30, 2007
    Assignee: Akzo Nobel N.V.
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren
  • Publication number: 20050257909
    Abstract: The invention relates to a process for producing board which comprises providing an aqueous suspension comprising cellulosic fibres; adding hydrotalcite to the suspension; dewatering the obtained suspension to provide a (i) single ply board. The invention further relates to board comprising one or more plies containing cellulosic fibres, wherein the board further comprises hydrotalcite distributed throughout at least one of said one or more plies.
    Type: Application
    Filed: May 17, 2005
    Publication date: November 24, 2005
    Inventors: Erik Lindgren, Erik Sanne, Marek Tokarz, Jerker Nilsson
  • Publication number: 20050228058
    Abstract: The invention relates to a process for producing aqueous silica-based sols which comprises providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; adjusting the pH of the aqueous slurry and separating the ion exchange resin from the aqueous slurry, as well as the silica-based sols obtained by the process. The invention also relates to silica-based sols obtained by the process, as well as a process for producing paper which comprises providing an aqueous suspension comprising cellulosic fibres; adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and dewatering the obtained suspension to provide a sheet or web of paper.
    Type: Application
    Filed: April 7, 2005
    Publication date: October 13, 2005
    Inventors: Glenn Mankin, Marek Tokarz, Freddie Hansson
  • Publication number: 20050113462
    Abstract: A process for the production of an aqueous sol containing silica-based particles which comprises (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight; (c) allowing particle growth of the alkalised sol for at least 10 minutes; or heat-treating the alkalised sol at a temperature of a least 30° C.; (d) alkalising the obtained sol to a pH of at least 10.0; and (e) optionally concentrating the sol obtained according to (b), (c) or (d) to provide an aqueous sol containing silica-based particles and having a specific surface area of at least 90 m2/g aqueous sol; as well as an aqueous sol containing silica-based particles obtainable by the process.
    Type: Application
    Filed: January 8, 2005
    Publication date: May 26, 2005
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren, Hans Johansson-Vestin
  • Publication number: 20040140074
    Abstract: The present invention relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a clay having 3R2 stacking; and (iii) dewatering the obtained suspension. The invention also relates to a process for the production of a cellulosic product which comprises (i) providing an aqueous cellulosic suspension; (ii) adding to the suspension a cationic clay; (iii) adding to the suspension one or more drainage and retention aids comprising at least one cationic polymer; and (iv) dewatering the obtained suspension. The invention further relates to a cellulosic product comprising clay having 3R2 stacking.
    Type: Application
    Filed: November 18, 2003
    Publication date: July 22, 2004
    Inventors: Marek Tokarz, Jerker Nilsson
  • Publication number: 20030024671
    Abstract: An aqueous sol containing silica-based particles which has an S-value within the range of from 10 to 45%, a viscosity within the range of from 5 to 40 cP, and a molar ratio of SiO2 to M2O, where M is alkali metal or ammonium, within the range of from 10:1 to 40:1, or a silica content of at least 10% by weight. The invention further relates to a process for the production of silica-based particles comprising the steps of: (a) acidifying an aqueous silicate solution to a pH of from 1 to 4 to form an acid sol; (b) alkalising the acid sol at an SiO2 content within the range of from 4.5 to 8% by weight to; (c) allowing particle growth of the alkalised sol for at least 10 minutes, or heat-treating the alkalised sol at a temperature of a least 30° C.; and then (d) alkalising the obtained sol to a pH of at least 10.0.
    Type: Application
    Filed: November 5, 2001
    Publication date: February 6, 2003
    Inventors: Michael Persson, Marek Tokarz, Maj-Lis Dahlgren