Gulf Oil Corporation

Reef Industries, Inc.

Ronald E Gilbert

Thomas J Lynch

Robert J Rowatt

Rajindar K Kochhar

Bert H Clampitt

A detectable tape including a ductile metal foil layer which is enclosed in a sheath of thermoplastic coating which provides a sealed edge along the length of the tape. The thermoplastic coating sheath protects the foil from corrosion when the detectable tape is placed underground above a nonmetallic body such as plastic pipe. The sealed edge detectable tape can also include a reinforcement layer which provides additional tensile strength.

Sealed edge detectable tape

A reinforced metallic and polymer tape which has a light reflecting metallic layer and can have a color coating. The reinforcing material is usually a nonwoven clear resin through which the color is clearly visible. The combination of the metallic layer and reinforcing layer produces a high tensile strength, tear resistant tape. The combination also produces a tape that does not have the tendency to curl.

Reinforced metallic and polymer tape

Propylene is polymerized with an improved titanium chloride catalyst. The improved titanium chloride catalyst is prepared by treating TiCl.sub.4 with an aluminum alkyl and treating the resulting titanium chloride catalyst with carbon dioxide and a Lewis base, such as di(n-butyl) ether in a hydrocarbon medium at an elevated temperature.

Process for polymerizing propylene with an improved titanium chloride

Titanium chloride catalysts having improved activity to polymerize propylene are prepared by treating TiCl.sub.4 with an aluminum alkyl and treating the resulting titanium chloride catalysts with carbon dioxide and a Lewis base such as di(n-butyl) ether at an elevated temperature.

Titanium chloride propylene polymerization catalyst and process for

An improved process is provided for incorporating additives into thermoplastic polymers. The desired additive(s) are dispersed in a continuous solid phase which is a mixture of a wax and a normally liquid hydrocarbon to form a Bingham fluid composition. These Bingham fluid compositions, while solid at ambient temperature and pressure, will flow under an applied pressure and can be pumped to feed the additive to a molten polymer. When this mixture is passed through a mixing apparatus such as an extruder, the additive is uniformly dispersed throughout the polymer. The process is particularly well suited to incorporate additives into a molten ethylene polymer either as, or immediately after, the molten ethylene polymer is discharged from the reaction zone in which the polymer is prepared.

Process for dispersing additives in thermoplastic polymers

A process is provided for the continuous high-pressure mass polymerization of ethylene in which novel means are employed to continuously introduce the free radical generating polymerization initiator into the polymerization zone. The process is carried out by pumping into the polymerization a Bingham fluid which has a free-radical generating polymerization initiator uniformly dispersed throughout a solid continuous phase, which is a mixture of a wax and a liquid hydrocarbon.

Continuous high pressure mass processes for the polymerization of

An improved process is provided for incorporating finely-divided inorganic additives such as diatomaceous earth into thermoplastic polymers. The desired additive(s) are dispersed in a normally liquid hydrocarbon to form a Bingham fluid composition. These Bingham fluid compositions, while solid at ambient temperature and pressure, will flow under an applied pressure and can be pumped to feed the additive to a molten polymer. When this mixture is passed through a mixing apparatus such as an extruder, the additive is uniformly dispersed throughout the polymer. The process is particularly well suited to incorporate such additives into a molten ethylene polymer either as, or immediately after, the molten ethylene polymer is discharged from the reaction zone in which the polymer is prepared.

Processes for dispersing inorganic additives in thermoplastic polymers

A process is provided for preparing a copolymer of ethylene and acrylic or methacrylic acid. Typically, a copolymer of ethylene and methyl acrylate is dissolved in a diarylalkane such as 1,1-dixylylethane. A transesterification catalyst and either isopropanol or tertiary butanol is added to the polymer solution which then is heated to reflux to convert the polymerized methyl acrylate moiety to the isopropyl or tertiary butyl acrylate moiety. Following completion of the transesterification reaction, any excess isopropanol or tertiary butanol is removed from the reaction system by distillation. The polymer solution then is heated to a temperature of the order of 320.degree. C to thermally crack the isopropyl or tertiary butyl acrylate and form the corresponding ethylene-acrylic acid copolymer. The ethylene-acrylic acid copolymer is insoluble in the diarylalkane and can be recovered by filtration.

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Katy, TX, United States of America

Ronald E Gilbert