Agfa-gevaert

Agfa Graphics Nv

Michael Dörr

Engelbert Pliefke

Steffen Denzinger

Günther Hultzsch

Andreas Elsässer

The invention relates to a recording material for the production of offset printing plates, having a web- or plate-form support, a radiation-sensitive layer on the front of the support and a continuous, pigment particle-free layer on the back of the support. The back layer essentially consists of an organic polymeric material having a glass transition temperature Tg of at least 45&#xb0; C., and its surface has a Bekk smoothness of from 5 to 800 s. It also relates to a process for the production of this recording material.

Radiation-sensitive recording material having a structured back

The invention relates to a recording material having a dimensionally stable, two-dimensional support, preferably an aluminium support, and a negative-working, radiation-sensitive layer which comprises a diazonium salt, a polymeric binder and a sulphobetaine. In addition, the layer may also comprise a polymerizable monomer or oligomer and a photopolymerization initiator. The front of the recording material may be matted or pigmented, and the back may be coated with an organic polymeric material. The sulphobetaine improves the solubility of the diazonium salts in aqueous-alkaline developers without reducing the resistance of the offset printing plates produced from the recording material.

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Mainz, Germany

Michael Dörr