Patents Assigned to Krems Chemie Aktiengesellschaft
  • Air entraining agent for concrete and mortar mixtures
    Patent number: 5759259
    Abstract: An air entraining agent based on rosin for a composition which contains cement and which is one of mortar or concrete includes at least one rosin salt which is a reaction product of materials including rosin and from 0.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: June 2, 1998
    Assignee: Krems Chemie Aktiengesellschaft
    Inventors: Marcel Sychra, Harald Steindl
  • Modified colophony resins, a process for their preparation, their use and paper-sizing agents containing colophony resins of this type
    Patent number: 5225527
    Abstract: Modified colophony resins are strengthened with .alpha.,.beta.-unsaturated carbonyl compounds and simultaneously converted into the corresponding intermolecular resin acid anhydrides with dehydrating agents. Paper-sizing agents which are superior to those of the prior art can be prepared from these.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: July 6, 1993
    Assignee: Krems Chemie Aktiengesellschaft
    Inventors: Johannes Fallmann, Wolfgang Streicher, Helmut Ronge