Minnesota Mining and Manufacturing Company

Mohammad Z Ali

Stanley C Busman

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.

High speed photopolymerizable element with initiator in a topcoat

A high speed visible light sensitive photopolymerizable composition useful for printing plates comprising

High sensitivity photopolymerizable composition

A visible light sensitive free radical polymerization photoinitiator composition comprising (a) an initiator selected from diaryl iodonium salts, halogenated triazines, and triaryl sulfonium salts having a reduction potential in the range 0.0 to -1.5 eV, and (b) at least one merocyanine sensitizer containing a constrained alkylamino group. These initiator compositions give high speed polymerization reactions with ethylenically unsaturated monomers and oligomers.

Growing community of inventors

Woodbury, MN, United States of America

Mohammad Z Ali