Patents Assigned to SNF S.A.
  • Patent number: 6964745
    Abstract: The invention relates to use of superabsorbent (co)polymers (SAP) as an agent for preservation treatment of animal hides. The SAP is used preferably in conjunction with salt or other hygroscopic agent, in particular 50% NaCl/50% SAP by weight. Suitably treated hides are obtained in 24 hours and one-half less salt is used in comparison to the prior art, disadvantages such as surface brine, salt in slaughterhouse waste, and others being eliminated.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: November 15, 2005
    Assignee: SNF S.A.
    Inventors: Jacques Brosse, Bernard Sabatier
  • Patent number: 6797785
    Abstract: The invention relates to a process of synthesis at low temperature of polymers of the PVA (polyvinylamine) type on the basis the monomer vinylformamide. The polymerization claimed for the invention begins at around 0° C., is initiated by an original combination of redox and azoic catalysts, and is conducted under more or less normal pressure. The polymerization is conducted in water and is followed by direct hydrolysis. A powdered cationic PVA of high molecular weight is thereby obtained. The process may also be conducted in an emulsion at an initiation temperature of around 15° C. Application of PVAs as flocculants and coagulants in the paper, water treatment, petroleum and parapetroleum, and, similar industries.
    Type: Grant
    Filed: December 31, 2001
    Date of Patent: September 28, 2004
    Assignee: SNF S.A.
    Inventors: René Hund, Christian Jehn-Rendu
  • Patent number: 6579417
    Abstract: According to the present invention, a cross-linked polymer or copolymer formed by reverse phase emulsion polymerization from suitable water-soluble monomers or from mixtures of such monomers is used as a retention agent. The process according to the invention is characterized in that the cross-linked polymer is sheared before its introduction or injection into the suspension to be flocculated. This results in a distinct improvement in the retention, formation, drainage and other properties of the paper or paperboard sheet thus obtained, as a function of the shearing.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: June 17, 2003
    Assignee: SNF S.A.
    Inventors: Rene Hund, Christian Jehn-Rendu
  • Patent number: 5925714
    Abstract: Improved water soluble vinyl addition polymers for use as thickening and flocculating agents in water purification treatment, paper manufacture and waste water treatment are prepared using alkoxylated castor oil as an activation release agent. The release agent is biodegradable thereby making the overall product process more environmentally friendly.
    Type: Grant
    Filed: March 4, 1994
    Date of Patent: July 20, 1999
    Assignee: SNF S.A.
    Inventors: Eric H. Larson, Manilal Dahanayake, William R. Busler