Abstract

244 having a thickness up to 5 microns.

IPC Classes  ?

• C23C 8/14 - Oxidising of ferrous surfaces
• C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
• C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• C22C 38/48 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• C22C 38/50 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
• C21D 6/00 - Heat treatment of ferrous alloys
• C10G 9/20 - Tube furnaces
• F28F 19/02 - Preventing the formation of deposits or corrosion, e.g. by using filters by using coatings, e.g. vitreous or enamel coatings
• F28F 21/08 - Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal

Abstract

The productivity of a catalyst in a gas phase polymerization of olefins (e.g. grams of polymer per gram of catalyst) may be increased by including in the gas phase from 1 to 20 weight % of an inert non-polymerizable hydrocarbon. The hydrocarbon may be in gaseous form but preferably is in liquid form.

IPC Classes  ?

• C08F 2/34 - Polymerisation in gaseous state
• C08F 110/02 - Ethene
• C08F 4/00 - Polymerisation catalysts
• C08F 4/22 - Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of chromium, molybdenum, or tungsten
• C08F 4/64 - Titanium, zirconium, hafnium, or compounds thereof