Overview no. 35 Dynamic recrystallization: Mechanical and microstructural considerations

Multimetallic catalysis based on heterometallic complexes and clusters.

Recent advances and actual challenges in late transition metal catalyzed hydrosilylation of olefins from an industrial point of view

European Union Risk Assessment Report

A full literature and patent account (about 100 references) is given on work describing the vinyl polymerization to homo-polynorbornene. The interest in vinyl homo-polynorbornene is driven by its dielectric and mechanical properties for the technical application as an interlevel dielectric in microelectronics applications. The norbornene/olefin copolymerization is covered to some extent for comparison. The metal catalysts are presented and important polymer product properties are emphasized.

Metal catalysts for the vinyl polymerization of norbornene

A catalytic process for preparing ethylene polymers having a density of >/=0.94 to /=22 to /=50,000 pounds of polymer per pound of Ti with a catalyst formed from selected organoaluminum compounds and a precursor composition of the formula MgmTi1(OR)nXp(ED)q wherein ED is a selected electron donor compound m is >/=0.5 to /=2 to 1.5 m+2 R is a C1 to C14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C1 to C14 aliphatic or aromatic hydrocarbon radical, and X is selected from the group consisting of Cl, Br, I or mixtures thereof, which catalyst is in particulate form and impregnated in a porous inert carrier material.

Union carbide corp

Ethylene copolymers having a density of ≥ 0.91 to ≤ 0.96 and a melt flow ratio of ≥ 22 to ≤ 32 are readily produced in a low pressure gas phase process at a productivity of ≥ 50,000 pounds of polymer per pound of Ti with a particulate catalyst diluted with an inert carrier material and formed from selected organo aluminum compounds and a precursor composition of the formula:
 wherein ED is a selected electron donor compound.
 m is ≥ 0.5 to ≤ 56 n is 0 or 1 p is ≥ 6 to ≤ 116 q is ≥ 2 to ≤ 85 R is a C 1 to C 14 aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C, to C 14 aliphatic or aromatic hydrocarbon radical, and X is selected from the group consisting of Cl, Br, I or mixtures thereof. This application is a Continuation-in-Part of co-pending application Serial No. 892,325 filed March 31, 1978.

Low pressure preparation of ethylene copolymers in fluid bed reactor

Catalyst compositions suitable for producing high density ethylene polymers in a low pressure gas phase process with low accompanying ethylene hydrogenation are produced by forming a precursor composition from a magnesium compound, titanium compound and electron donor compound; diluting said precursor composition with an inert carrier material; treating said diluted precursor composition with a boron halide compound: and activating the precursor composition with an organo aluminum compound. A preparative method and a polymerization process are also disclosed.

Improved catalyst composition for polymerizing ethylene, preparative method and polymerization process

Katalytiskt foerfarande foer polymerisation av etylen samt en foerblandning foer den enligt foerfarandet anvaenda katalysatorn

A cataylst formed from selected organo aluminum compounds and a precursor composition of the formula
 wherein ED is a selected electron donor compound m is ≥ 0.5 to < 56 n is 0 or 1 p is ≥ 6 to ≤ 116 q is ≥ 2 to ≤ 85 R is a C, to C 14 , aliphatic or aromatic hydrocarbon radical, or COR' wherein R' is a C, to C 14 aliphatic or aromatic hydrocarbon radical, and X is selected from the group consisting of Cl, Br, 1, or mixtures thereof, which catalyst is in particulate from and diluted with an inert carrier material; A process for preparing such cataylst; A process for using said catalyst to readily prepare ethylene homopolymer having a density of about a 0.958 to ≤ 0.972 and a melt flow ratio of a 22 to ≤ 32 in a low pressure gas phase process at a productivity of a 50,000 pounds of polymer per pound of Ti. Novel polymers and molded articles are prepared. This application is a Continuation-in-Part of co-pending application Serial No. 892,037 filed March 31, 1978.

Karol Frederick John

Papers

Union carbide corp

Low pressure preparation of ethylene copolymers in fluid bed reactor

Improved catalyst composition for polymerizing ethylene, preparative method and polymerization process

Katalytiskt foerfarande foer polymerisation av etylen samt en foerblandning foer den enligt foerfarandet anvaenda katalysatorn

Process for preparing polymerization catalyst and process for ethylene homopolymerization