Abstract: In an embodiment a method for producing a lighting device includes providing a wafer assemblage having a semiconductor layer sequence arranged on a carrier substrate, separating the wafer assemblage into a plurality of first optoelectronic semiconductor chips, each comprising a section of the semiconductor layer sequence and of the carrier substrate, transferring at least some of the first optoelectronic semiconductor chips to a first auxiliary carrier, wherein the first auxiliary carrier has contact pads on a main surface, wherein the contact pads are surrounded and delimited in each case by a contour, and wherein each of the first optoelectronic semiconductor chips is arranged on a contact pad, cutting, on the first auxiliary carrier, to size the first optoelectronic semiconductor chips in order to adapt the first optoelectronic semiconductor chips to a predefined shape such that the each first optoelectronic semiconductor chip lies completely within the contour of an assigned contact pad, and transferring

Abstract: The invention generally relates to a method of inhibiting polymerization of vinyl aryl monomers, a process for increasing number average molecular weight of a polystyrene, and to an inhibitor composition useful therein.

Abstract: The invention generally relates to a method of inhibiting polymerization of vinyl aryl monomers, a process for increasing number average molecular weight of a polystyrene, and to an inhibitor composition useful therein.

Abstract: The present invention is directed towards a polymerization process for the preparation of block copolymers. In an embodiment, the polymerization process may comprise low levels of catalyst in an oxidized state that react with a reducing agent to form an active catalyst. Embodiments of the process surprisingly use low levels of catalysts and allow formation of the all blocks with the same catalyst. The catalyst may be deactivated and reactivated to form each block. In one embodiment of the invention, the catalyst is oxidized to the deactivator state when the desired degree of polymerization of a polymer segment or block is reached. The first monomer may be removed prior to addition of the second monomer. The catalyst may then be reactivated for preparation of a second block.