Patents Examined by Brammer Jack P.
  • High speed photopolymerizable element with initiator in a topcoat
    Patent number: 4988607
    Abstract: A high speed photopolymerization negative-acting printing plate containing a layer comprising a photo-sensitized polymerization initiator and polymerizable ethylenically unsaturated compound, exhibits higher speed and good shelf life when at least 20% by weight of the total initiator is situated in an oxygen barrier top coat. Addition of p-substituted-N-disubstituted-anilines to the polymerizable layer gives further improvement in stability.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: January 29, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Mohammad Z. Ali