Patents by Inventor Klaus Petschel

Klaus Petschel 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).

  • Core/shell particles, and curable epoxy resin composition comprising same
    Patent number: 6180693
    Abstract: Core/shell particles comprising a core comprising an elastomer having a TG value of <0° C., onto which a shell of a crosslinked copolymer is grafted, where the proportion of the crosslinking component in the copolymer of the shell is from 5 to 90% by weight, based on the total amount of the comonomers of the shell copolymer, are suitable as toughening agents for epoxy resins, with which they have good compatibility.
    Type: Grant
    Filed: September 3, 1999
    Date of Patent: January 30, 2001
    Assignee: Vantico Inc.
    Inventors: Qian Tang, Martin Roth, Dean Tallak Behm, Carl Walter Mayer, Klaus Petschel, Sameer Hosam Eldin
  • Core/shell particles, and curable epoxy resin compositions comprising same
    Patent number: 6037392
    Abstract: Core/shell particles comprising a core comprising an elastomer having a T.sub.G value of <0.degree. C., onto which a shell of a crosslinked copolymer is grafted, where the proportion of the crosslinking component in the copolymer of the shell is from greater than 5 to 90% by weight, based on the total amount of the comonomers of the shell copolymer, are suitable as toughening agents for epoxy resins, with which they have good compatibility.
    Type: Grant
    Filed: November 21, 1996
    Date of Patent: March 14, 2000
    Assignee: Ciba Specialty Chemicals Corp.
    Inventors: Qian Tang, Martin Roth, Dean Tallak Behm, Carl Walter Mayer, Klaus Petschel, Sameer Hosam Eldin
  • Curable epoxy resin mixtures containing metal salts
    Patent number: 5569734
    Abstract: Curable mixtures comprising(a) an epoxy compound having on average more than one epoxy group per molecule,(b) a metal complex salt of formula IM(L).sub.a X'.sub.b X".sub.c .cndot.dY (I),whereinM is a cation of a transition metal,L is a Lewis base,a is a number from 2 to 6,X' is an anion of an acid radical,X" is an cation of an acid radical differing from X'b is 0 or a number which, together with the number c, which is greater than 0, corresponds to the valency of the cation of the transition metal,Y is a solvent molecule, andd is 0 or a number from 0 to 5, and,as optional component(c) a hardener for epoxy resins,are distinguished by good solubility of the metal salt in the epoxy resin and achieve uniform crosslinking during the curing of the epoxy resin.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: October 29, 1996
    Assignee: Ciba-Geigy Corporation
    Inventors: Klaus Petschel, Uwe Weinzierl