Ciba-geigy Corporation

Ciba-geigy Ag

Aerni-leuch Ag

Niklaus Baumann

Hans Zweifel

John S Waterhouse

Marcus Baumann

Marcus Bauman

Hans-Peter Schlunke

Benzene diazonium compounds of the general formula ##STR1## wherein R.sub.1 is alkylamino, dialkylamino, cycloalkylamino, dicycloalkylamino, cycloalkylalkylamino, aralkylamino, diaralkylamino, alkylaralkylamino, cycloalkylaralkylamino, arylamino, diarylamino, alkylarylamino, cycloalkylarylamino, acoylamino, acoylalkylamino, acoylcycloalkylamino, acoylaralkylamino, acoylarylamino, aroylamino, aroylalkylamino, aroylcycloalkylamino, aroylaralkylamino, aroylarylamino, morpholino, piperidino, triazinyl, alkylthio, hydroxyalkylthio, cycloalkylthio, aralkylthio, or arylthio; R.sub.2 is alkyl, aralkyl, aryl, or alkoxyalkyl; R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7 and R.sub.8 may be the same or different and are hydrogen, alkyl, cycloalkyl, aralkyl, aryl, or halogen, at least one of the substituents R.sub.3 to R.sub.8 not being hydrogen; and X is an anion. Salts of the foregoing compounds are utilized in diazotype materials having improved water resistance and speed of development without impairment of other characteristics such as light sensitivity.

Benzene diazonium salts and diazotype material utilizing same

The invention relates to organic polymers which can be crosslinked under the action of light and which are suitable for carrying out photomechanical processes. These polymers are photochemically considerably more sensitive than known comparable polymers and their sensitivity can additionally also be further increased by means of a combination with sensitizers. The molecular weight is at least 1,000. The polymers contain, as light-sensitive groups, groups of the formula I ##STR1## wherein R and R.sub.1 independently of one another denote alkyl groups with at most 4 C atoms, or R and R.sub.1 conjointly denote the remaining part of a 5-membered to 6-membered carbocyclic ring.

Crosslinkable polymeric compounds

The invention relates to organic polymers which can be crosslinked under the action of light and which are suitable for carrying out photomechanical processes. These polymers are photochemically considerably more sensitive than known comparable polymers and their sensitivity can additionally also be further increased by means of a combination with sensitisers. The molecular weight is at least 1,000. The polymers contain, as light-sensitive groups, groups of the formula I ##STR1## wherein R and R.sub.1 independently of one another denote alkyl groups with at most 4 C atoms, or R and R.sub.1 conjointly denote the remaining part of a 5-membered to 6-membered carbocyclic ring.

Crosslinkage polymeric compounds

Photopolymerizable material for the preparation of stable polymeric images, is provided which is characterized in that it contains, on a carrier, at least one layer composed of

Photo-polymerizable material for the preparation of stable polymeric

In photopolymerization, the polymerization process is activated or initiated by radiation, for example in the region of ultraviolet or visible waves. According to the present invention ethylenically unsaturated compounds can now be polymerized advantageously with the aid of a new catalyst system which consists of a diazine compound, preferably a quinoxaline and an electron donor, which together act as a photoredox pair.

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Marly, Switzerland

Niklaus Baumann