Basf Aktiengesellschaft

Ulrich Erhardt

Karl-Heinz Schumacher

Harald Meyer

Bernd Bruchmann

Erich Beck

Wolfgang Reich

Wolf-Dieter Balzer

Edmund Keil

Adolf Nuber

Volker Ladenberger

Jochem Henkelmann

Oral Aydin

Heike Becker

Ralf Fink

Ulrich Jager

Martin Jung

Walter Holtrup

Uwe Duesterwald

Jurgen Barwich

The invention relates to radically copolymerizable acetophenone or benzophenone derivatives, obtained by reaction of The invention also relates to copolymers that contain copolymerizable photoinitiators of the invention and to the use of said copolymers in UV-crosslinkable compositions, particularly hot-melt adhesives.

Copolymerizable photoinitiators for UV-crosslinkable adhesives

The invention relates to radically copolymerizable acetophenone or benzophenone derivatives, which may be obtained by reacting a) acrylic or methacrylic compounds, which contain at least one isocyanate-reactive group [compounds a)], with b) compounds, which contain at least two isocyanate groups [compounds b)] and c) acetophenone or benzophenone derivatives, which contain at least one isocyanate-reactive group [compounds c)]. Said invention also relates to copolymers, which contain said copolymerizable photoinitiators, as well as to the use of said copolymers in UV-crosslinkable substances, in particular hot-melt pressure-sensitive adhesives.

The present invention relates to the use of acetophenone or benzophenone derivatives of the formula I whereR is unsubstituted or substituted The invention further relates to copolymers containing acetophenone or benzophenone derivatives of the formula I in copolymerized form, to processes for preparing said copolymers, and to the use of said copolymers in UV crosslinkable compositions.

UV-crosslinkable copolymers

A composition containing a melt-processing water-free, solvent-free polyacrylate and an anti-oxidizing agent which contains at least one aromatically bonded hydroxyl group and which is exclusively comprised of hydrogen, carbon and oxygen atoms.

UV cross-linkable melt adhesives containing stabilizers

Volatile components are eliminated from polyacrylate melts by distilling off the volatile components by a process in which the volatile components are distilled off under reduced pressure, entraining agents are added to the melts at above 100.degree. C. and the melts are simultaneously circulated.

Elimination of volatile residues from polyacrylate melts

Radiation-curable acrylates are prepared by a process in which the hydroxy compound is reacted with acrylic acid or methacrylic acid in a first stage and, in a second stage, the reaction product of the first stage is reacted with an epoxide compound in the presence of, as a catalyst, a quaternary ammonium or phosphonium compound of the general formula ##STR1## where X.sup.- is an opposite ion and R.sup.1 to R.sup.4 independently of one another are each C.sub.1 -C.sub.18 -alkyl which may be substituted by one or two phenyl groups or are each C.sub.6 -C.sub.12 -aryl which may be substituted by one or two C.sub.1 -C.sub.6 -alkyl groups.

Preparation of radiation-curable acrylates that are storage stable with

Radiation-curable acrylates are prepared by a process in which, in a 1st stage, a hydroxy compound is reacted with acrylic acid or methacrylic acid and, in or before a 2nd stage, the reaction product of the 1st stage is then reacted with an epoxy compound and compounds having one or more primary or secondary amino groups are added in the 2nd stage and the reaction in the 2nd stage is continued, after the addition of these compounds, until the acid number of the reaction mixture has decreased by at least 3 mg KOH/g of reaction mixture from the time of the addition of these compounds.

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Ladenburg, Germany

Ulrich Erhardt