Biuret Containing (i.e., -nh-c(=o)-nh-c(=o)-nh- Containing, Wherein Substitution May Be Made For Hydrogen Only) Patents (Class 560/335)
  • Process for the preparation of polyisocyanates with biuret structure
    Patent number: 4613686
    Abstract: The present invention relates to a process for the preparation of polyisocyanates which have a biuret structure of reacting excess quantities of aliphatic diisocyanates with biuretizing agents at elevated temperature, characterized in that the biuretizing agent contains(a) .alpha.,.alpha.,.alpha.-trisubstituted acetic acids which do not contain isocyanate-reactive groups apart from the carboxyl group, and optionally(b) water,wherein the molar ratio of biuretizing components (a) to (b) is within the range of from 1:0 to 1:2.5.
    Type: Grant
    Filed: January 25, 1985
    Date of Patent: September 23, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus Konig, Josef Pedain, Helmut Woynar