Patents by Inventor Ralf-Johan Lamminmaki

Ralf-Johan Lamminmaki 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).

  • Publication number: 20200299516
    Abstract: The invention relates to a method for preparing durable titanium dioxide particles. The preparation process includes an aqueous grinding step, which comprising providing an aqueous slurry or dispersion comprising titanium dioxide particles, aluminum containing compound and phosphorous containing compound into grinding equipment. The slurry or dispersion is subjected to an aqueous grinding process, and subsequently titanium dioxide particles having a core of titanium dioxide and a pre-coating layer thereon is obtained, said pre-coating layer containing aluminum and phosphorous containing compounds. The invention further covers the resulting titanium dioxide particles and uses thereof.
    Type: Application
    Filed: March 29, 2017
    Publication date: September 24, 2020
    Applicants: Venator P&A Finland Oy, Venator Germany GmbH
    Inventors: Ralf-Johan LAMMINMÄKI, Kaarina HEIKKILÄ
  • Publication number: 20200248000
    Abstract: A method for manufacturing pigmentary titanium dioxide particles coated with a SiO2 coating layer includes steps of (i) forming an aqueous dispersion containing rutile titanium dioxide particles having an average particle size of in a range of 7-1000 nm, (ii) introducing to said dispersion of step (i) a silicon containing compound and a base, (iii) adding to the dispersion obtained from step ii acid, (iv) repeating the steps ii and iii at least once. Finally, the pH of the dispersion is lowered to a value within the range from 1.9 to 9.0 before filtering and washing thus obtained product.
    Type: Application
    Filed: October 15, 2018
    Publication date: August 6, 2020
    Applicants: Venator P&A Finland Oy, Venator Germany GmbH
    Inventor: Ralf-Johan Lamminmäki
  • Patent number: 9212066
    Abstract: Processes of preparing metal titanate from one or more metal compounds, and a product provided by the process. In one embodiment, sodium titanate and an ionic metal compound are mixed into an aqueous mixed slurry, which is allowed to react into metal titanate at the boiling point of the mixed slurry or below, by mixing it at normal pressure and in a normal gaseous atmosphere. After this, the metal titanate product is optionally washed, and/or filtered and dried.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: December 15, 2015
    Assignee: SACHTLEBEN PIGMENTS OY
    Inventors: Ralf-Johan Lamminmäki, Jani Kallioinen, Arja-Leena Ruohonen
  • Patent number: 8840814
    Abstract: A lithium titanate product, the formula of which is in the form of LixTiyOz, and wherein y is 1, the x:y molar is 1.1-1.8, while the z:y molar ratio is 2.0-4.5. Also disclosed is a method of preparing alkali metal titanates, such as lithium titanate, at a low temperature of below 100° C., from an aqueous titanium-containing slurry and an alkali metal compound.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: September 23, 2014
    Assignee: Sachtleben Pigments Oy
    Inventors: Ralf-Johan Lamminmäki, Margit Rajamäki, Merja Kruunari
  • Patent number: 8268203
    Abstract: A method for producing microcrystalline titanium dioxide in the rutile form having a crystal size below 15 nm by an aqueous method, and a titanium dioxide product doped with silicon obtained by the method. The method generally includes adding a silicon containing compound during crystal formation to provide said titanium dioxide product with a small crystal size.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: September 18, 2012
    Assignee: Sachtleben Pigments Oy
    Inventors: Ralf-Johan Lamminmäki, Johanna Niinimäki
  • Patent number: 8182602
    Abstract: The invention relates to a method of preparing a well-dispersable, rutile-structured, microcrystalline titanium dioxide product, a product prepared by the method, and an effect paint and a lacquer provided by means of the product. In the method, the titanium dioxide starting material is first treated with a base to have an alkaline pH value, after which it is treated with an acid to have a hydrochloric acid content of 8 to 30 g/l, neutralized, processed, and calcinated. In particular, the preparation method is characterized by the use of a pretreatment chemical before the calcination stage to improve the dispersability.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: May 22, 2012
    Assignee: Sachtleben Pigments Oy
    Inventors: Ralf-Johan Lamminmäki, Esa Latva-Nirva, Riitta Linho, Johanna Niinimäki, Visa Vehmanen
  • Publication number: 20110278495
    Abstract: A lithium titanate product, the formula of which is in the form of LixTiyOz, and wherein, when y is 1, the x:y molar ratio is 1.1-1.8, while the z:y molar ratio is 2.0-4.5. Also disclosed is a method of preparing alkali metal titanates, such as lithium titanate, at a low temperature of below 100° C., from an aqueous titanium-containing slurry and an alkali metal compound.
    Type: Application
    Filed: November 4, 2008
    Publication date: November 17, 2011
    Applicant: SACHTLEBEN PIGMENTS OY
    Inventors: Ralf-Johan Lamminmäki, Margit Rajamäki, Merja Kruunari
  • Publication number: 20110274614
    Abstract: Processes of preparing metal titanate from one or more metal compounds, and a product provided by the process. In one embodiment, sodium titanate and an ionic metal compound are mixed into an aqueous mixed slurry, which is allowed to react into metal titanate at the boiling point of the mixed slurry or below, by mixing it at normal pressure and in a normal gaseous atmosphere. After this, the metal titanate product is optionally washed, and/or filtered and dried.
    Type: Application
    Filed: November 4, 2008
    Publication date: November 10, 2011
    Applicant: SACHTLEBEN PIGMENTS OY
    Inventors: Ralf-Johan Lamminmäki, Jani Kallioinen, Arja-Leena Ruohonen
  • Publication number: 20110192322
    Abstract: The invention relates to a method of preparing a well-dispersable, rutile-structured, microcrystalline titanium dioxide product, a product prepared by the method, and an effect paint and a lacquer provided by means of the product. In the method, the titanium dioxide starting material is first treated with a base to have an alkaline pH value, after which it is treated with an acid to have a hydrochloric acid content of 8 to 30 g/l, neutralized, processed, and calcinated. In particular, the preparation method is characterized by the use of a pretreatment chemical before the calcination stage to improve the dispersability.
    Type: Application
    Filed: August 15, 2008
    Publication date: August 11, 2011
    Inventors: Ralf-Johan Lamminmäki, Esa Latva-Nirva, Riitta Linho, Johanna Niinimäki, Visa Vehmanen
  • Publication number: 20110180769
    Abstract: A method for producing microcrystalline titanium dioxide in the rutile form having a crystal size below 15 nm by an aqueous method, and a titanium dioxide product doped with silicon obtained by the method. The method generally includes adding a silicon containing compound during crystal formation to provide said titanium dioxide product with a small crystal size.
    Type: Application
    Filed: June 30, 2009
    Publication date: July 28, 2011
    Applicant: SACHTLEBEN PIGMENTS OY
    Inventors: Ralf-Johan Lamminmäki, Johanna Niinimäki
  • Patent number: 7662359
    Abstract: The invention relates to a process for manufacturing a particulate titanium dioxide product, wherein hydrated titanium dioxide is precipitated from an aqueous solution of titanium oxychloride by adding to the solution titanium dioxide particles as crystal nuclei and the product obtained from the precipitation step is isolated and optionally calcined. The process is characterized by the addition of crystal nuclei to an aqueous solution of titanium oxychloride having a content of >90 g TiO2/l calculated as TiO2 and the performance of precipitation at a temperature below the boiling point of the said aqueous solution and at normal pressure. In addition, the invention relates to a titanium dioxide product prepared by using the process, the use of the product as a photocatalyst, and a photocatalyst, which comprises a titanium dioxide product prepared according to the invention.
    Type: Grant
    Filed: February 4, 2005
    Date of Patent: February 16, 2010
    Assignee: Sachtleben Pigments Oy
    Inventors: Saila Mariatta Karvinen, Ralf-Johan Lamminmäki
  • Publication number: 20070173405
    Abstract: The invention relates to a process for manufacturing a particulate titanium dioxide product, wherein hydrated titanium dioxide is precipitated from an aqueous solution of titanium oxychlioride by adding to the solution titanium dioxide particles as crystal nuclei and the product obtained from the precipitation step is isolated and optionally calcined. The process is characterized by the addition of crystal nuclei to an aqueous solution of titanium oxychloride having a content of >90 g TiO2/l calculated as TiO2 and the performance of precipitation at a temperature below the boiling point of the said aqueous solution and at normal pressure. In addition, the invention relates to a titanium dioxide product prepared by using the process, the use of the product as a photocatalyst, and a photocatalyst, which comprises a titanium dioxide product prepared according to the invention.
    Type: Application
    Filed: February 4, 2005
    Publication date: July 26, 2007
    Applicant: Kemira Pigments OY
    Inventors: Saila Karvinen, Ralf-Johan Lamminmaki
  • Patent number: 7138357
    Abstract: The invention relates to a photocatalyst containing titanium dioxide, to a method for using it and to its application. A sulphurous titanium dioxide hydrate precipitate is precipitated from an acid titanium oxysulphate solution at a temperature below the boiling point of the solution, e.g. in the range from 70 to 100° C., using crystal nuclei and without addition of base. The precipitate is separated, washed and calcinated. The photocatalytic titanium dioxide thus obtained has a specific area in the range from 100 to 250 m2/g and a 0.3 to 5% sulphur concentration. Catalytic activity has been confirmed in asetal dehyde decomposition and in anionic (SNC?)2 radical formation.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: November 21, 2006
    Assignee: Kemira Pigments Oy
    Inventors: Saila Marjatta Karvinen, Ralf-Johan Lamminmäki
  • Publication number: 20050181937
    Abstract: The invention relates to a photocatalyst containing titanium dioxide, to a method for using it and to its application. A sulphurous titanium dioxide hydrate precipitate is precipitated from an acid titanium oxysulphate solution at a temperature below the boiling point of the solution, e.g. in the range from 70 to 100° C., using crystal nuclei and without addition of base. The precipitate is separated, washed and calcinated. The photocatalytic titanium dioxide thus obtained has a specific area in the range from 100 to 250 m2/g and a 0.3 to 5% sulphur concentration. Catalytic activity has been confirmed in asetal dehyde decomposition and in anionic (SNC?)2 radical formation.
    Type: Application
    Filed: April 1, 2003
    Publication date: August 18, 2005
    Applicant: KEMIRA PIGMENTS OY
    Inventors: Saila Karvinen, Ralf-Johan Lamminmaki