Abstract: Particle size is increased and particle size range can be decreased, i.e., narrower particle size distribution can be obtained for Ziegler transition metal halide catalysts by working the catalysts with very small quantities of a fibrillatable polytetrafluoroethylene (PTFE) powder in order to trap, i.e., entangle the catalyst in a web of PTFE submicroscopic fibers.

Abstract: Large particle size polyolefin is obtained by polymerizing mono-olefins in the presence of a supported olefin catalyst which has been ball milled in the presence of small quantities of polytetrafluoroethylene (PTFE) powder in order to trap, i.e., entangle, the supported catalyst in a web of PTFE submicroscopic fibers.

Abstract: Specific thermoplastic compositions which are formulated to be exceptionally useful for adhesion to copper-containing metals are prepared from either glycidyl acrylate grafts of polypropylene based formulations with a minor elastomeric component or low density polyethylene based formulations grafted with acrylic acid and/or glycidyl acrylate and containing a minor elastomeric component.

Abstract: Polyethylene is produced by polymerization of ethylene alone or with comonomers or telogens (modifiers) in an elongated tubular reactor having an inlet and outlet and at least one reaction zone and one cooling zone in the presence of free radical or free oxygen yielding initiator at elevated temperatures and pressures by passing the reaction mixture through each of the reaction zones of the tubular reactor having internal diameters between about 0.5 and 3 inches at bulk fluid velocities sufficient so that the Flow Number in each reaction zone is greater than 3.3 ft..sup.2 /sec. Flow Number is defined as the bulk fluid velocity in ft./sec. times diameter in feet. With Flow Numbers in excess of 3.3 ft..sup.2 /sec. in the reaction zones, it has been found that the effective reaction volume in the reaction zone has been increased and, accordingly, a more efficient process for producing a high quality polyethylene.