Abstract: A composition forming a rubber roller and an imaging apparatus including the rubber roller are provided by the invention. A small amount of a nitrogen-containing compound is formed during the process of preparing the rubber roller without deterioration of image quality of images produced by an imaging apparatus. The roller rubber forming composition includes a base rubber; a vulcanizing agent; a vulcanizing accelerator; a conducting agent; and one of an acid anhydride, a zeolite, and a blend thereof.

Abstract: The process is characterized by the use of catalyst systems consisting of a single metallocene catalyst activated with mixtures of at least 2 co-catalysts. The co-catalysts are aluminium alkyls, aluminoxanes or boron compounds. Different active centers are produced in the catalyst through the use of these mixed co-catalyst systems, each having different rates of initiation and completion of the polymerization reaction, which give rise to polyolefins with different molecular weights, resulting in products with broad bimodal or multimodal molecular weight distributions and the incorporation of co-monomer can be controlled by appropriate selection of the metallocene and use of combinations of different types of co-catalysts, as well as by varying the reactor pressure, the reaction temperature and the molar ratios between the various components of the catalyst system.