| Patent Number |
Title Of Patent |
Date Issued |
| 7402637 |
Method for producing a poly-1-olefin in the presence of a Ziegler catalyst |
July 22, 2008 |
| The invention relates to a method for producing a poly-1-olefin by polymerization of a 1-olefin of the formula R.sup.4C.dbd.CH.sub.2, in which R.sup.4 is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas the gas phase, at a temper |
| 7196152 |
Modified Ziegler catalyst, process for preparing it and process for preparing poly-1-olefins in |
March 27, 2007 |
| The invention relates to a modified Ziegler catalyst for preparing a poly-1-olefin in suspension, in solution or in the gas phase, which catalyst comprises the reaction product of a magnesium alkoxide (component a) with a transition metal compound (component b) and an organometallic |
| 7008898 |
Method for producing a poly-1-olefin in the presence of a ziegler catalyst |
March 7, 2006 |
| The invention relates to a method for producing a poly-1-olefin by polymerisation of a 1-olefin of the formula R.sup.4CH.dbd.CH.sub.2, in which R.sup.4 is hydrogen or an alkyl radical having from 1 to 10 carbon atoms, in suspension, in solution or in the gas phase, at a temperature o |
| 6770341 |
Polyethylene molding material and pipe produced therewith with improved mechanical properties |
August 3, 2004 |
| A polyethylene molding material has a bimodal molecular weight distribution with an overall density of .gtoreq.0.948 g/cm.sup.3 and a melt flow index MFI.sub.190/5 of .ltoreq.0.2 dg/min. The molding material comprises from 35 to 65% by weight of low-molecular-weight ethylene hompolymer A |
| 6713561 |
Polyethylene moulding compound with an improved ESCR/stiffness relation and an improved swelling |
March 30, 2004 |
| The invention relates to a polyethylene moulding compound having a multimodal molecular weight distribution which has an overall density of .gtoreq.0.940 g/cm.sup.3 and an MFI.sub.190/5 in the range from 0.01 to 10 dg/min. The moulding compound according to the invention comprises an |
| 6204345 |
Suspension polymerization for preparing polyolefins |
March 20, 2001 |
| The novel process for preparing ethylene copolymers by polymerizing ethylene with, as comonomer, up to 10% by weight, based on the total amount of the monomers, of a 1-olefin of the formula R--CH.dbd.CH.sub.2, where R is a straight-chain or branched alkyl radical having from 1 to 4 c |
| 5917100 |
Process for producing low molecular-weight poly-1-olefins |
June 29, 1999 |
| A catalyst formed by the reaction of a magnesium alkoxide dispersion having a particle size of from 100 to 3000 nm with a compound of a metal selected from the group comprising titanium, zirconium, vanadium and chromium and then with a chlorine-containing organoaluminum compound possesse |
| 5908679 |
Pipe of polyethylene having improved mechanical properties |
June 1, 1999 |
| The invention relates to a high strength pipe of ethylene polymer having a bimodal molecular weight distribution. Such pipe has a stress cracking resistance of .gtoreq.1400 h, a fracture toughness of .gtoreq.7 mJ/mm.sup.2 and a modulus of creep in flexure, measured according to DIN 5 |
| 5798309 |
Process for preparing a poly-1-olefin |
August 25, 1998 |
| Process for preparing a poly-1-olefinBy means of a highly active spherical Ziegler catalyst based on a dialkylmagnesium, spherical polymers can be obtained in the polymerization of alpha-olefins. A further advantage of the catalyst of the invention lies in the high catalyst activity, so |
| 5750813 |
Process for the preparation of polyolefin waxes |
May 12, 1998 |
| A process for the preparation of a polyolefin wax by polymerization or copolymerization of olefins or diolefins in suspension and in the presence of a catalyst. The process utilizes a metallocene and a cocatalyst, wherein the metallocene is a compound of the formula I ##STR1## in |
| 5741545 |
Process for conditioning organic substrate surfaces |
April 21, 1998 |
| Organic substrate surfaces, particularly of industrial polymers, are provided by fluorination or chlorination with corresponding layers so as to obtain certain properties; for the purpose of improving the application of a layer, the surfaces are exposed beforehand at temperatures between |
| 5723705 |
Process for the preparation of polyolefin waxes in the presence of a metallocene catalyst and a |
March 3, 1998 |
| A process for the preparation of a polyolefin wax by polymerization or co-polymerization of olefines or diolefins at a temperature of -40.degree. to 100.degree. C. at a pressure of 0.5 to 120 bar, in suspension and in the presence of a metallocene catalyst and a co-catalyst, thereby |
| 5648309 |
Process for the preparation of a poly-1-olefin |
July 15, 1997 |
| A Ziegler catalyst in which the transition metal component has been prepared by reacting a transition metal compound of titanium, zirconium, vanadium or chromium with a gel-like dispersion of a magnesium alcoholate is used for the preparation of poly-1-olefins, in particular polyethylene |
| 5602218 |
Process for the preparation of a poly-1-olefin |
February 11, 1997 |
| A particularly uniform Ziegler catalyst in the form of spherical particles is obtained by using shock waves instead of a stirrer for the thorough mixing of the reactants. By means of this highly active catalyst based on a magnesium dialkyl, it is possible to obtain polymers in the form o |
| 5338589 |
Polyethylene molding composition |
August 16, 1994 |
| A polyethylene molding composition which consists of 50 to 80% by weight of a HD polyethylene having a very broad bimodal molecular mass distribution and 20 to 50% by weight of a chemical LLD polyethylene or LD polyethylene gives pipes, plates and sheets which have very good long-term an |
| 5292837 |
Process for the preparation of ethylene (co)polymers |
March 8, 1994 |
| For the homopolymerization of ethylene or for the copolymerization of ethylene with other 1-olefins, a catalyst is used which comprises a trialkylaluminum compound and the entire product from the reaction of a magnesium alkoxide which is dissolved, suspended or dispersed as a gel in |
| 5202398 |
Process for the preparation of a 1-olefin polymer |
April 13, 1993 |
| If the transition metal component used in an olefin polymerization catalyst is the product of the reaction between a siloxane-substituted metallocene of titanium, zirconium or hafnium and a hydroxyl group-containing support material, for example silicon dioxide, these metallocene catalys |
| 5081322 |
Polypropylene wax and process for the production thereof |
January 14, 1992 |
| Polyolefin waxes are obtained in high yield by copolymerizing propylene with small amounts of other olefins in the presence of a catalyst composed of a metallocene of the formula I: ##STR1## and an alumoxane. The waxes are produced as compact, spherical particles having a narrow |
| 5071808 |
Process for the preparation of a heterogeneous metallocene catalyst component |
December 10, 1991 |
| The invention relates to a process for the preparation of a heterogeneous metallocene catalyst component from a suitably substituted metallocene of the sub-group 4 of the Periodic Table of the Elements and from poly(methylhydrogensiloxane) under the concomitant action of a catalyst. |
| 4311752 |
Ethylene copolymers and their use for the manufacture of films |
January 19, 1982 |
| Copolymers of ethylene and higher 1-olefins which are suitable for the manufacture of thin films, are preferably prepared in a two-step process, the first step yielding a polymer having a high molecular weight, the second step giving a polymer having a low molecular weight. The films |
| 4152117 |
Process for the quantitative analysis of organoaluminum compounds in their solutions |
May 1, 1979 |
| The concentration of organoaluminum compounds in their solutions can be determined quantitatively, even in a range of less than 10 mmols/dm.sup.3, when adding to the solution to be analyzed instantaneously an excess of reactant and when measuring the produced reaction heat. |
| 4130396 |
Method for the quantitative analysis of Al-C- and Al-H- bonds in hydrocarbons |
December 19, 1978 |
| For quantitative analysis of aluminum compounds containing Al--C-- and Al--H-- bonds in hydrocarbons the organo-aluminum compounds are decomposed with a lower alcohol and the excess alcohol is subjected to back titration with the solution of a colored compound of an alkali metal with a |
| 4028929 |
Modified ubbelohde viscosimeter |
June 14, 1977 |
| A Ubbelohde viscosimeter is disclosed which is modified according to the present invention by mounting to its reservoir a pressure tube and to the upper ends of the pressure tube and the conventional capillary tube a double three way cock. The cock controls pressure supply to the reservo |
