E.i. Dupont De Nemours and Company

Ursula Annerose Kraska

Mario Grossa

Bernhard Metzger

Richard Douglas Bauer

Manfred A Sondergeld

Reimund Simon

Udo Weikart

Rudolf Leonard Osowski

Ute Erika Hirse

A photopolymerizable composition for the preparation of flexographic printing forms for corrugated board direct printing comprising a radial (polystyrene-polybutadiene) X block copolymer, with X&equals;Sn or Si and n&equals;2 or 4, with an average molecular weight (M ) of 80,000-300,000, a molecular weight distribution (M /M ) of 1.00-1.40, a content of di- block copolymers of less than 15% by weight, which is extended with up to 50% by weight of a paraffinic oil.

Photopolymerizable composition for the production of flexographic printing forms for corrugated board printing

An aqueous developer for photopolymerizable, flexographic printing plates containing an ethylenediamine triacetate-N-alkylacetamide having a long-chain aliphatic hydrocarbon radical in the N-alkylamido group and a process for preparing flexographic printing forms by the use of this developer are described.

Developer and process for preparing flexographic printing forms

An aqueous developer for photopolymerizable flexographic printing plates containing a combination of an amino alcohol and/or an amino carboxylic acid and a surfactant or a combination of two surfactants and a process for preparing flexographic printing forms by the use of this developer are described.

Monochrome and polychrome color proofs, for the graphic arts industry, having an image carrier containing two layers A and B to control optical dot growth are described. Layer A contains at least one polyolefin and, in a preferred embodiment, a light-reflecting white pigment. Layer B contains at least one binder, at least one light-reflecting white pigment at between 50% and 90% by weight relative to Layer B, and at least one light-absorbing pigment. A process and a means for preparing such monochrome and polychrome color proofs are described.

Monochrome and polychrome color proofs with low optical dot growth and a

A process for covering edges and/or filling openings or gaps which are formed when photopolymerizable printing plates or printing forms for flexographic printing are mounted on a printing cylinder, by applying an edge covering or gap filling material of low molecular weight and oligomeric, ethylenically unsaturated compounds and hardening the materials by exposure with actinic light.

Process for adhering the edges of photopolymerizable printing plates or

A process for recycling exposed and/or unexposed photopolymer flexographic printing plate containing a photopolymerizable recording layer and a support, said process comprising (a) separating the recording layer from the support and comminuting the material and (b) adding the material to a photopolymer mixture is described. The process reduces waste problems, is more environmentally friendly and is used to prepare photopolymerizable flexographic printing plates containing less raw materials.

Recycling the recording layer of flexographic printing plates

A positively working, tonable, photohardenable mixture, as well as image-forming material prepared therefrom are described, which as essential components, contains a binder or mixture of binders, a photohardenable compound, a photoinitiator or an initiator system and a multivalent metal compound to improve the toning properties of the material.

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Weiterstadt, Germany

Ursula Annerose Kraska