摘要:
Zeolite supported, organochromium based catalyst compositions are provided which are especially suitable for the polymerization of 1-olefins such as ethylene. Pi-bonded organochromium [II] compounds such as chromocene (dicyclopentadienyl chromium) are reacted with ZSM-5 type zeolites to produce such novel catalysts.
摘要:
Zeolite supported, organometallic derived catalyst compositions are provided which are especially suitable for the polymerization of 1-olefins such as ethylene. Organotitanium and organochromium compounds such as tributylchromium and tetrabutyltitanium are reacted with ZSM-5 type zeolites to produce such novel catalysts.
摘要:
Zeolite supported, organometallic based catalyst composition are provided which are especially suitable for the polymerization of 1-olefins such as ethylene. Alkyltitanium and alkylchromium compounds such as tributylchromium and tetrabutyltitanium are reacted with ZSM-5 type zeolites to produce such novel catalysts.
摘要:
Zeolite supported, organochromium based catalyst compositions are provided which are especially suitable for the polymerization of 1-olefins such as ethylene. Pi-bonded organochromium [II] compounds such as chromocene (dicyclopentadienyl chromium) are reacted with ZSM-5 type zeolites to produce such novel catalysts.
摘要:
Styrene or other anionically polymerizable monomer is anionically homopolymerized in a dispersion using a non-solvent, e.g., hexane using three or more stages to obtain spherical microparticles, e.g., 2-5 microns, with a narrow size distribution.
摘要:
A UHF antenna for black and white and color television receivers embodies a dished reflector and coacting a dipole mounted a fraction of a wave-length in front of the reflector and being of bow tie configuration. The antenna possesses broad band characteristics for wide angle reception, and wide frequency deviation at UHF wave-lengths. The antenna structure which is for indoor use is fabricated from simple sheet metal components and embodies an integral support base which can be manually adjusted in any direction. Economy and simplicity of construction are featured.
摘要:
Sulfur-coupled hydrocarbyl derived mercaptobenzothiazole adducts have been found to be effective multifunctional antiwear additives for fuels and lubricants.
摘要:
Polymers of methyl styrene produced from an isomer mixture having a high content of the para-isomer are halogenated, sulfonated or subjected to other substitution reactions.
摘要:
There is provided a method for the suspension polymerization of one or more styrenic monomers. This method involves increasing the amount of substantially water insoluble free radical initiator in the suspension after the conversion of the monomer has reached at least 50%. The temperature of the suspension is at least 110.degree. C. throughout the entire polymerization.
摘要:
A process for the hydrogenation of hydrocarbon materials having olefinic unsaturation and/or olefinic-aromatic unsaturation, and particularly wherein hydrogenation is carried out at relatively low catalyst levels and mild reaction conditions whereby olefinic bonds are reduced and, when components of the reaction mixture contain aromatic unsaturation, to effect selective hydrogenation of olefinic bonds, without substantial, if any, hydrogenation of aromatic unsaturation; said process comprising contacting such hydrocarbon materials under hydrogenation reaction conditions of temperature and pressure in the presence of bis(1,5-cyclooctadiene) nickel as the hydrogenation catalyst.