Abstract: Method for producing flexographic printing plates from a photopolymerizable flexographic printing plate with a dimensionally stable support, photopolymerizable, relief-forming layer(s), and a digitally imagable layer. The method comprises (a) producing a mask by imaging the digitally imagable layer, (b) exposing the flexographic printing plate with a plurality of UV-LEDs on a UV-LED strip through the mask with actinic light, and photopolymerizing the image regions of the layer, and (c) developing the photopolymerized layer. In the UV-LED strip or in a separate strip, at least one ultrasonic sensor is arranged for determining the thickness of the flexographic printing plate for exposure. Depending on the measured thickness of the flexographic printing plate, the exposing of the flexographic printing plate is controlled in respect of: (i) number of exposure steps, exposure intensity, energy input per exposure step, duration of the individual exposure steps, and/or overall duration of exposure.

Abstract: The present invention relates to a multi-functional carbamate having a soft segment, which can be used as a raw material in the preparation of a polyisocyanate having a special siloxane soft segment in its structure by a non-phosgene method; to a polyisocyanate having a special siloxane soft segment prepared by a non-phosgene method; to a urethane prepolymer having a special siloxane soft segment, prepared from a polyisocyanate having a special siloxane soft segment and a polyol; and also to a elastomeric urethane having a special siloxane soft segment, prepared by reacting a polyisocyanate having a special siloxane soft segment with a polyol and an optional chain extender. The present invention also relates to a synthesis method for the above-mentioned substances.