摘要:
A Ziegler-type polymerization catalyst comprising a first catalyst component containing a transition metal compound and a second catalyst component containing an organometallic compound, which first catalyst component contains a silicon compound. Preparation of the first catalyst component and production of olefin polymers are also disclosed.
摘要:
An Alpha -olefin is polymerized with another monomer through the use of a catalyst system prepared by combining: (I) a solid composition prepared by milling titanium trichloride in the presence of modifier, which is a halohydrocarbon, a silicon compound represented by the general formula SiXm'' Y4 m'' , where X'' is a halogen, Y'' is hydrogen, an alkyl group, an aryl group, an aralkyl group, an alkaryl group, or an alkoxyl group, and m is zero or the integer 1, 2, 3, or 4 (exclusive of SiH4), or a halogen compound of a specific metal; (II) an organoaluminum compound; and (III) a cycloheptatriene compound, including salts of tropylium.
摘要:
MODIFIED PROPYLENE POLYMER IS PROVIDED HAVING IMPROVED IMPACT RESISTACE AND TOUGHNESS AT LOW TEMPERATURE AS WELL AS HAVING A HIGH SOFTENING POINT AND STIFFNESS. THE MODIFIED PROPYLENE POLYMER IS PRODUCED BY A PROCESS OF POLYMERIZING A MEMBER OF THE GROUP CONSISTING OF PROPYLENE AND ETHYLENE AND SUBSEQUENTLY POLYMERIZING CONTINUOUSLY IN THE SAME SYSTEM THE OTHER MEMBER OF SAID GROUP, SAID POLYMERIZATION BEING EFFECTED AT A TEMPERATURE OF 30-100*C., AT A PRESSURE OF FROM 1-10 ATMOSPHERS AND UTILIZING AS CATALYSTS DIALKYLALUMINUM MONOHALIDE AND TITANIUM TRICHLORIDE, THE POLYMERIZATION OF ETHYLENE BEING EFFECTED IN THE PRESENCE OF AN AVERAGE AMOUNT OF FROM 0-25% BY VOLUME OF PROPYLENE AND THE AMOUNTS OF ETHYLENE AND PROPYLENE FED TO THE REACTION SYSTEM BEING ADJUSTED SO THAT THE RESULTING MODIFIED PROPYLENE POLYMER CONTAINS FROM 5 TO 40% BY WEIGHT ETHYLENE.
摘要:
Polymerization of olefins and catalyst therefor, said catalyst comprising polymerizing at least one member selected from the group consisting of ethylene, propylene, butene-1 and styrene in the presence of a catalyst composition comprising (1) an organoaluminum compound having the formula, AIR2X wherein R represents a hydrocarbon residue selected from the group consisting of alkyl, aryl, aralkyl, alkaryl and cycloalkyl groups and X represents a halogen atoms selected from the group consisting of chlorine, bromine and iodine, (2) a halide of a transition metal of Groups IV, V and VI of the Periodic Table of the Elements, and (3) an aliphatic carboxylic ester having a side chain on a carbon atom in a Alpha -position to the ester carbon atom, the molar proportion of said organoaluminum compound, said halide of transition metal and said aliphatic carboxylic ester being 10-0.5 : 1 : 0.01-1.