Gulf Oil Corporation

Chevron Chemical Company LLC

Robert L Batchelor

Gene E Kellum

Thomas J Lynch

Charles F Feldman

A polymerization process is provided comprising contacting under polymerization conditions a catalyst, a taming agent, ethylene and optionally a comonomer, wherein the catalyst comprises chromium oxide, titanium oxide and an inorganic refractory oxide, wherein the taming agent is selected from the group consisting of water, alcohols, aldehydes, ketones, esters, and organic acids and mixtures thereof. The process is especially suited for polymerizing ethylene resins suitable for blow molding use.

Polymerization processes

Disclosed is a process for making polyethylene resin by reacting ethylene or ethylene and a C.sub.3 -C.sub.8 alpha-olefin in the presence of a CrO.sub.3 /TiO.sub.2 catalyst on a silica support in a gas-phase polymerization reactor and in the presence of a catalyst productivity reduction agent such as oxygen. The resin in one embodiment has a melt flow ratio between 65 and 140 and a melt index between 0.1 and 0.6 g/10 min. The resin is particularly suitable for use in blow-molding applications.

Production of blow molding polyethylene resin

Laminated glass structures are prepared by bonding together at least two glass sheets with an ethylene polymer containing substituent carboxylic groups and, optionally, amide and/or ester groups.

Manufactured glass laminates

The invention is directed to a pycnometer designed to measure the density of particulate porous polymer samples, particularly polymer samples having hydrocarbons and/or air absorbed in the pores thereof. The apparatus includes a sample cell of fixed volume fitted with a sample container of fixed weight, a gas reservoir of fixed volume, a valved line providing gas communication between the sample cell and the gas reservoir, a linear variable differential transducer to measure the weight of the polymer sample in the sample cell, a variable capacitance quartz crystal for measuring gas pressure in the gas reservoir, and a computer which calculates the density of the sample from the sample weight, and the volume of the sample determined by measurement of a super-atmospheric gas pressure in the gas reservoir when isolated from the sample cell and the equalized pressure established when the gas reservoir is placed in open communication with the sample cell. An output signal from the computer indicative of the sample's density can be fed to a light-emitting diode or a printer, or to a process control computer to make any required adjustments in a polymerization reactor to produce polymer within a preselected range of polymer density.

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Orange, TX, United States of America

Robert L Batchelor