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公开(公告)号：US3729450A
公开(公告)日：1973-04-24
申请号：US3729450D
申请日：1971-03-10
发明人： GALIANO F , GREENLEE N
CPC分类号： C08F22/04
摘要： MALEIC ANHYDRIDE AND ALIPHATIC 1-OLEFINS HAVING FROM 8 TO 18 CARBON ATOMS INCLUSIVE ARE COPOLYMERIZED IN THE PRESENCE OF A FREE RADICAL CATALYST AND AN EFFICIENT SOLVENT FOR BOTH THE MONOMERS AND THE RESULTING COPOLYMER, FOR EXAMPLE 1,1- OR 1,2-DICHLOROETHANE. ENOUGH SOLVENT IS EMPLOYED TO SOLUBILIZE NOT ONLY THE REACTANTS BUT ALSO THE COPOLYMER PRODUCTS TO GIVE SOLUTIONS OF MODERATE VISCOSITIES. THE PRODUCTS ARE THEN RECOVERED BY STEAM DISTILLATION UNTIL SOLVENT AND OTHER LIQUID MATERIALS ARE REMOVED, LEAVING MOLTEN COPOLYMER, WHICH IS THEN POURED ON A CHILLED METAL SURFACE ON WHICH THE POLYMER RAPIDLY SOLIDIFIES. THE STEAM STRIPPED COPOLYMERS ARE SUFFICIENTLY NON-TACKY AND BRITTLE SO THAT THEY ARE PARTED FROM THE METAL SURFACE AND BROKEN INTO CHUNKS BY BENDING OR INVERTING THE CHILLED SURFACE AND ALLOWING THE SOLID MATERIAL TO FALL FOR A SUBSTANTIAL DISTANCE INTO A CONTAINER.
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公开(公告)号：US3819598A
公开(公告)日：1974-06-25
申请号：US20537171
申请日：1971-12-06
摘要： AN IMPROVED CATALYST COMPOSITION FOR THE POLYMERIZATION OF MONO 1-OLEFINS COMPRISING CHROMIUM OXIDE SUPPORTED ON A PRECIPITATE, POROUS SILICA HAING A SURFACE AREA OF NOT LESS THAN 150 SQUARE METERS PER GRAM AND WHEREIN THE AVERAGE DIAMETER OF THE SILICA PARTICLES IS LESS THAN 0.0005 MILLIMETER.
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3.发明授权
公开(公告)号：US3729455A
公开(公告)日：1973-04-24
申请号：US3729455D
申请日：1971-03-11
摘要： A CONTROL METHOD COMPRISING MEASURING THE ELECTRICAL CONDUCTIVITY OF AN ORGANIC SOLVENT OLEFIN POLYMERIZATION SYSTEM CONTAINING AN ORGANOMETALLIC CATALYST AND ADJUSTING THE CONCENTRATION OF THE ORGANOMETALLIC CATALYST IN SAID POLYMERIZATION SYSTEM RESPONSIVE TO THE ELECTROCONDUCTIVITY MEASUREMENT.
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