Patents Assigned to Keil & Weinkauf
  • Positive and negative working radiation sensitive mixtures and production of relief patterns
    Patent number: 5069997
    Abstract: Positive and negative working radiation sensitive mixtures suitable in particular for producing relief patterns contain a polymeric binder and an organic compound whose solubility in an aqueous alkaline developer is increased by the action of acid and which contains at least one acid cleavable group and also an additional group which upon irradiation forms a strong acid, the polymeric binders being reaction products of polymers that contain phenolic hydroxyl groups with dihydropyran or with alkyl vinyl ethers.
    Type: Grant
    Filed: May 16, 1989
    Date of Patent: December 3, 1991
    Assignee: Keil & Weinkauf
    Inventors: Reinhold Schwalm, Horst Binder