摘要:
The invention relates to a creep-optimized ultrahigh molecular weight polyethylene (UHMWPE) fiber obtained by spinning an UHMWPE comprising olefinic branches (OB) and having an elongational stress (ES), and a ratio (OB/1000 C/ES) between the number of olefinic branches per thousand carbon atoms (OB/1000 C) and the elongational stress (ES) of at least 0.2, wherein said UHMWPE fiber when subjected to a load of 600 MPa at a temperature of 70° C., has a creep lifetime of at least 90 hours.
摘要:
The invention relates to a method for the preparation of a catalyst suitable for the polymerisation of an olefin by contacting a magnesium compound with a halogenized group 4 or 5 metal compound, wherein the magnesium compound is obtained by the reaction of a solution of an organomagnesium compound with a silicon mixture or compound, characterized in that (a) the organomagnesium compound solution is obtained by contacting metallic magnesium Mg with an aromatic halide RX and an ether R0, wherein R is an aromatic group containing 6 to 20 carbons and X is a halide, and (b) the silicon mixture or compound is the product obtained by mixing or reacting a hydrocarbyl halide silane with an alkoxy group or aryloxy group containing silane compound.
摘要:
The invention relates to a process for the production of an ultra-high molecular weight polyethylene ((U)HMWPE) article comprising: —copolymerizing ethylene with a linear, branched or cyclic polyene having 3 to 100 carbon atoms, resulting in a copolymer of ethylene and polyene ((U)HMWPE-P), using such a content of polyene that the number of polyene branches in (U)HMWPE-P is 0.01 to 15 on the average per 1000 carbon atoms; —cross-link the (U)HMWPE-P during or after molding the (U)HMWPE-P.