Abstract: A method of performing a polymerization reaction in a gas phase polymerization reactor to produce a bimodal polymer while controlling activity of a bimodal polymerization catalyst composition in the reactor by controlling concentration of at least one induced condensing agent (‘ICA’) in the reactor is provided. In some embodiments, the ICA is isopentane (or another hydrocarbon compound) and the bimodal catalyst composition includes a Group 15 and metal containing catalyst compound (or other HMW catalyst for catalyzing polymerization of a high molecular weight fraction of the product), and a metallocene catalyst compound (or other LMW catalyst for catalyzing polymerization of a low molecular weight fraction of the product).

Abstract: A method of performing a polymerization reaction in a gas phase polymerization reactor to produce a bimodal polymer while controlling activity of a bimodal polymerization catalyst composition in the reactor by controlling concentration of at least one induced condensing agent (‘ICA’) in the reactor is provided. In some embodiments, the ICA is isopentane (or another hydrocarbon compound) and the bimodal catalyst composition includes a Group 15 and metal containing catalyst compound (or other HMW catalyst for catalyzing polymerization of a high molecular weight fraction of the product), and a metallocene catalyst compound (or other LMW catalyst for catalyzing polymerization of a low molecular weight fraction of the product).

Abstract: A method of electrocoating the surface of an article such as the internal surface of a can body using as electrode a mandrel having an external surface of substantially the same shape as the surface to be coated. The can body is positively located in a cell containing the mandrel by way of a seal in the cell wall and a limiting surface such that the internal surface to be electrocoated is substantially equidistantly spaced from the mandrel. Electrocoating fluid is flowed by way of a central bore in the mandrel between the mandrel and the internal surface and one or more electrocoating pulses are applied between the mandrel and the can body to electrocoat the internal surface thereof.

Abstract: An electrocoating apparatus has a plurality of cells movable successively to each of a plurality of operating stations. An electrical circuit is provided to monitor the cells and initiate the application of electrical pulses to each cell if the cell has not exhibited any faults. Each cell is subjected to a test at two selected operating stations and the result of each test is entered as a binary digit in a respective shift register. As the cell is advanced each binary digit is similarly advanced in its shift register by clock pulses. Unidirectional electrical pulses are applied as electrocoating pulses at electrocoating stations such that each cell is normally subjected to three successive discrete pulses. However, if a cell which has failed either of the test arrives at the electrocoating stations, the presence of its binary digit in the appropriate stage of the shift register inhibits the application of electrocoating pulses thereto.