Hoechst Aktiengesellschaft

Karl-Josef Rauterkus

Matthias Kroggel

Dieter Mohr

Waltraud Mueller-Hess

Hans-Dieter Hermann

Joachim Gersdorf

A photopolymerizable mixture is disclosed which contains:

Photopolymerizable mixture and recording material containing

A photocurable elastomeric mixture is described which comprises a compound which contains at least one terminal ethylenically unsaturated group and is polymerizable by free radical polymerization, a photopolymerization initiator and, as binder, a graft polymer which is soluble or dispersible in water or an aqueous solution, the graft base of which is a polymer of diol components and diisocyanate components having at least 2 urethane groups in the molecule, onto which polymer carboxylic acid vinyl ester units having 3 to 20 carbon atoms, or their saponification products, are grafted. The mixture is suitable for the production of relief printing plates, in particular flexographic printing plates, and can be developed with water or aqueous solutions.

Photocurable elastomeric mixture and recording material, obtained

A photocurable mixture is disclosed that contains a diazonium salt polycondensation product or an organic azido compound as the photosensitive compound and a high-molecular weight polymer as the binder, the polymer being a graft copolymer with a polyurethane as the graft backbone, onto which chains containing vinyl alcohol units are grafted. The mixture is suitable for use in the production of printing plates and photoresists, which can be developed with aqueous solutions. It yields printing plates having a good ink acceptance and long shelf life that produce large print runs.

Photocurable mixture and material containing diazonium salt

Polymers with polyvinyl acetal groups, which contain acetalized polyvinyl alcohol groups on polyurethane grafting substrates and which are prepared from graft polymers, containing vinyl alcohol groups on polyurethane grafting substrates, by reaction with aldehydes according to known methods. The aldehydes used can be any known aldehydes capable of acetalization reactions. The polyurethane grafting substrates contain at least 2 urethane groups in the molecule and units from diisocyanates and diols, and polymer radicals of units of vinyl carboxylates having 3 to 20 carbon atoms and/or hydrolysis products thereof and, if appropriate, further monomer units are grafted onto the polyurethane grafting subtrates. The proportion of vinyl alcohol units in the hydrolyzed or partially hydrolyzed graft polymers before the acetalization is &gt;10% by weight. In the acetalized polymer, the content of residual unacetalized vinyl alcohol units is &gt;7.5 mol %, relative to the molar content (=100 mol %) of vinyl alcohol units in the starting graft polyvinyl alcohol before acetalization. Use of the graft polyvinyl acetals as a constituent of coating compositions, as a coating agent constituent for the diverse substrates, as a material for thermoplastically processable moldings and as an interleaving film in laminated glasses.

Graft polymers, containing polyvinyl acetal groups, on polyurethane

Polymers with polyvinyl acetal groups, which contain acetalized polyvinyl alcohol groups on polyurethane grafting substrates and which are prepared from graft polymers, containing vinyl alcohol groups on polyurethane grafting substrates, by reaction with aldehydes according to known methods. The aldehydes used can be any known aldehydes capable of acetalization reactions. The polyurethane grafting substrates contain at least 2 urethane groups in the molecule and units from diisocyanates and diols, and polymer radicals of units of vinyl carboxylates having 3 to 20 carbon atoms and/or hydrolysis products thereof and, if appropriate, further monomer units are grafted onto the polyurethane grafting substrates. The proportion of vinyl alcohol units in the hydrolyzed or partially hydrolyzed graft polymers before the acetalization is &gt;10% by weight. In the acetalized polymer, the content of residual unacetalized vinyl alcohol units is &gt;7.5 mol %, relative to the molar content (=100 mol %) of vinyl alcohol units in the starting graft polyvinyl alcohol before acetalization. The graft polyvinyl acetals may be used as a constituent of coating compositions, as a coating agent constituent for the diverse substrates, as a material for thermoplastically processable moldings and as an interleaving film in laminated glasses.

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Kelkheim, Germany

Karl-Josef Rauterkus