E.i. Dupont De Nemours and Company

Abraham B Cohen

Roxy N Fan

Roxy Ni Fan

Robert B Heiart

Martin D Bratt

John Anthony Quinn

Vincent J Webers

Joseph E Gervay

Grant A Beske

Michael J Krawacki

Roger O Uhler

Christina N Lazaridis

Leo Roos

Tit-Kueng Lau

The invention is directed to a laminate for the preparation of printed circuits by electroless plating of conductive metal thereon which comprises

Embedded catalyst receptors for metallization of dielectrics

An integral three-dimensional object is formed from a photohardenable liquid composition containing radiation deflecting matter.

Solid imaging method using multiphasic photohardenable compositions

The invention is directed to a laminate for the preparation of a multilayer printed circuit by electroless plating of conductive metal thereon which comprises

Method for making multilayer circuits using embedded catalyst receptors

Lamination of a photopolymerizable film onto a substrate employs an intermediate nonphotosensitive liquid which is substantially all monomer.

Lamination of photopolymerizable film onto a substrate employing an

Photosensitive coating composition consisting essentially of an ethylenic unsaturated compound, a photoinitiator or photoinitiator system, an organic polymeric binder, discrete, substantially nonswellable, nonagglomerating, crosslinked beads, 0.1 to 4.0 .mu.m in average diameter size, at least 90% of the beads by population below 6.0 .mu.m, as defined and a solvent for the binder. The crosslinked beads can be present in positive-working systems. Preferred beads are trimethylolpropane triacrylate. The coating composition can be dried quickly into the form of a film which is useful as a dry film photoresist.

Positive-working photosensitive elements containing crosslinked beads

Photosensitive coating composition consisting essentially of an ethylenic unsaturated compound, a photoinitiator or photoinitiator system, an organic polymeric binder, discrete, substantialy nonswellable, nonagglomerating, crosslinked beads, 0.1 to 4.0 .mu.m in average diameter size, at least 90% of the beads by population below 6.0 .mu.m, as defined and a solvent for the binder. The crosslinked beads can be present in positive-working systems. Preferred beads are trimethylolpropane triacrylate. The coating composition can be dried quickly into the form of a film which is useful as a dry film photoresist.

Dry photosensitive film containing crosslinked beads

Photosensitive coatings containing crosslinked beads

Apparatus for registering and imagewise exposing to actinic radiation a sequence of similar sheet substrates employing liquid applicator means to allow a photomask to contact a photosensitive layer on the substrate through a liquid.

Automatic repetitive registration and imagewise exposure of sheet

Method for repetitive registering and imagewise exposing to actinic radiation a sheet substrate containing a photosensitive layer with use of a sequence of related photomasks. A liquid layer separates the photosensitive layer and each photomask during the exposure step.

Sequential automatic registration and imagewise exposure of a sheet

Method and apparatus for registering and imagewise exposing to actinic radiation a sequence of similar sheet substrates. A liquid layer separates the photosensitive layer and each photomask during the exposure step.

Automatic repetitive registration and image wise exposure of sheet

Method for registering and imagewise exposing to actinic radiation a sequence of sheet substrates which are registerable to one another to produce a composite image. A liquid layer separates the photomask and photosensitive layer of the substrate during the exposure.

Multiple registration and imaging process to form a set of registered

Discrete, substantially nonswellable crosslinked polymeric beads, 0.7 to 20 .mu.m average diameter wherein at least 90% of the beads by population are below 20 .mu.m, which are nonagglomerating in any solvent or solvents including solvents for the liquid monomer or monomers used in preparation thereof. The polymeric beads are homopolymers of tri- and tetraacrylate and tri- and tetramethacrylate monomers, copolymers thereof, copolymers of one of said acrylate or methacrylate monomers with up to 50% of a monomer having a single terminal ethylenic group or with up to 75% of a monomer having two terminal ethylenic groups or three terminal ethylenic groups different from said triacrylate or trimethacrylate monomers defined above.

Crosslinked triacrylate polymer beads

In a process for laminating a photosensitive layer to a aluminum or copper substrate surface by means of nip rolls, the improvement comprising the sequential steps of:

Laminating process

A dry-developing dry film resist is provided comprising a photopolymerizable layer preferably sandwiched between a support sheet and a cover sheet, the layer comprising polymerizable monomer in excess of the absorptive capacity of the layer, photopolymerization initiator, and binder component of a plurality of polymers, at least one of these polymers being incompatible so as to be present as a dispersion in the layer to reduce the cohesive strength of the layer. The layer is developed by peeling away the support sheet, the unexposed area of the layer adhering to the support sheet and the exposed area adhering to the substrate to which it was laminated to form a resist image against such treatments as etching, plating and soldering, especially to make a printed circuit.

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Springfield, NJ, United States of America

Abraham B Cohen