Rohm Gmbh

Rohm Gmbh Chemische Fabrik

Otto Hitzler

Winfried Wunderlich

Horst Pennewiss

Gerhard Markert

Michael Muller

August Froelich

Polymer-modified bituminous compositions containing 0.5 to 20% by weight of polymer components, where 20 to 100% by weight of the polymer added is polyalkyl(meth)acrylate, which in synthesized from 50 to 99.8% by weight from C.sub.6 to C.sub.28 alkyl(meth)acrylates, 0.2 to 20% by weight from polymerizable carboxylic acids and/or sulfonic acids and 0 to 49.8% by weight from one or more other polymerizable, in particular nitrogen-containing compounds. Through the addition of reactive metal compounds, bituminous mixtures with improved elastic recovery, for example ranging from &gt;50% to about 90%, with low temperature flexibility and high thermal stability are obtained.

Metal compound containing polymer modified bitumen

What is disclosed is the polymerization of free radically-polymerizable compounds such as acryl compounds and methacryl compounds under the influence of light having a wave length from 200 nm to 500 nm in the presence of a symmetric azo compound comprising tertiary aliphatic hydrocarbon groups each having a molecular weight of 71 to 97 bound to the azo group, whereby the polymerization temperature can be maintained under 100.degree. C. by regulation of the light intensity.

Photopolymerization method with symmetric azo alkanes

Symmetric azo-bis-mercapto compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 are methyl or ethyl, R.sub.3 and R.sub.4 are the same or different alkylene having 1 to 4 carbon atoms, and n is 0 or 1, and a method for forming block copolymers of vinyl monomers in a two-step process employing such compounds as polymerization initiators.

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Erzhausen, Germany

Otto Hitzler