E.i. Dupont De Nemours and Company

Other

Reichhold Chemicals

John Anthony Quinn

Roxy N Fan

Abraham B Cohen

Paul Thomas Shea

Roxy Ni Fan

David W Swatton

Jan Grossman

Jose Antonio Briones

John Alan Lawton

James William O'Neil

Ernst Leberzammer

Stephen Cushner

Carol Marie Van Zoeren

An aqueous developable photosensitive element comprising a support and a photosensitive layer provided thereon, said layer containing (a) an elastomeric microgel binder having an elastomeric core which can be crosslinked and a thermoplastic noncrosslinked shell, (b) an initiator, (c) an ethylenically unsaturated monomer or oligomer and optionally (d) a basic compound capable of neutralizing the acidic functionality and method of use to make an aqueous developable flexographic printing plate is described.

Aqueous developable flexographic printing plate

A process for making a multilayer flexographic printing plate which involves reinforcing and laser engraving a multilayer flexographic printing element.

Lasers engravable multilayer flexographic printing element

Process for preparing an aqueous developable photosensitive element

A method and composition for forming investment casting patterns wherein thermally-collapsible microspheres are incorporated into the pattern composition. The patterns can be made either by conventional pattern forming techniques or by solid imaging techniques. After investing the microsphere containing pattern in the ceramic shell, the pattern and shell are heated, causing a collapse of the microspheres and thereby preventing cracking of the shell. The shell is then heated to burn-out the remaining pattern material and fire the shell, thereby creating a mold.

Investment casting pattern material comprising thermally-collapsible

Investment casting method and pattern material comprising

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

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

Process of enlarging image areas covered by a stencil or relief image area formed in a photopolymer mask consisting essentially of (a) contacting said image area with a swelling agent and optionally a diluent to effect enlargement, and (b) removing excess swelling agent, i.e., evaporation, air impingement including heating. Additional image enlargement is possible by further contacting the image with a more concentrated swelling agent. The process is particularly useful in enlarging halftone image dots of photopolymer litho masks wherein the halftone image areas consist of hardened upper skins which rest on softer undervolumes having a lesser degree of polymerization or hardening.

Enlargement of photopolymer images in photopolymer mask

A high speed, positive-working photopolymer element comprising, in order: (1) a support, (2) a nonphotosensitive layer comprising a hardenable binder (e.g., gelatin) containing a releasable hardener (e.g., glutaraldehyde-bisulfite), and an optional colorant, and (3) a permeable photopolymerizable layer. Imagewise exposure of the photopolymerizable layer is followed by diffusion of an alkali through the nonimage area, releasing the hardener. A subsequent wash-off step produces a positive image of the original.

Single exposure positive-working photopolymer element

A positive-working imaging element is described comprising a support coated first with a negative-working, solvent-developable, photohardenable stratum, then over-coated with a second negative-working, solvent-developable, photohardenable stratum; the second stratum serves as a mask for the first stratum since it contains ingredients which strongly absorb radiation actinic to the first stratum. The second stratum is imagewise exposed, solvent developed, and the resulting actinically opaque image used as a negative in exposing the first stratum, which is solvent developed to remove the composition in unexposed, but not in exposed areas. Optionally, a separating layer can be present between the photohardenable strata and a cover layer can be present over the second stratum. Positive-working low relief images suitable for lithographic printing plates, printed circuit resists, and contact-speed lithographic films are obtained from the elements of this invention.

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Morganville, NJ, United States of America

John Anthony Quinn