Sabic Global Technologies B.v.

Ahmad Abdullah Alshaiban

Yahya Banat

Akhlaq A Moman

Abderrahman Meddad

Sudhakar R Padmanabhan

Inaamul Haq Siddiqui

Osamah Al-Humaidan

Bandar Abdullah Almohammadi

Abdulaziz Hamad Al-Humydi

Hesham A Al-Shobilly

Abdulrahman Albeladi

Saad Nasser Al-Hussain

Abdulrahman Al-Beladi

Riyadh A Al Humoud

Musaad Al-Sadhan

Imam Khasim Hadimani

Osamah Maidan

Abdulaziz Humydi-Al

Hesham Al-Shobilly

Riyadh Al Humoud

A procatalyst for polymerization of olefins, based on a magnesium compound of the formula MgR'R&#x2033; wherein R&#x2032; is an alkoxide or aryloxide group and R&#x2033; is an alkoxide or aryloxide group or halogen that has been reacted with a tetravalent titanium halide, an activator being a monoester and an internal donor of formula B: as described herein. Also described is a polymerization catalyst system comprising the procatalyst, a co-catalyst and optionally an external electron donor; a process of making a polyolefin by contacting an olefin with the catalyst system; a polyolefinobtained by or obtainable by the process; and a polyolefin, preferably a polypropylene, having a molecular weight distribution of between 3 and 15, a molecular weight (M) of between 200,000 to 1,000,000 g/mol, a melting temperature of more than 145&#xb0; C., a value for the xylene solubles of less than 4 wt. % and a shaped article therefrom.

Procatalyst for polymerization of olefins

The present invention relates to a process for the continuous preparation of a polyolefin in a reactor from one or more &#x3b1;-olefin monomers of which at least one is ethylene or propylene, wherein the reactor comprises a fluidized bed, an expanded section located at or near the top of the reactor, a distribution plate located at the lower part of the reactor and an inlet for a recycle stream located under the distribution plate wherein the process comprises&#x2014;feeding a polymerization catalyst to the fluidized bed in the area above the distribution plate&#x2014;feeding the one or more &#x3b1;-olefin monomers to the reactor&#x2014;withdrawing the polyolefin from the reactor&#x2014;circulating fluids from the top of the reactor to the bottom of the reactor, wherein the circulating fluids are compressed using a compressor and subsequently cooled using a heat exchanger to form a cooled recycle stream comprising liquid, and wherein the cooled recycle stream is introduced into the reactor using the inlet for the recycle stream wherein a part of the cooled recycle stream is drawn to form a liquid comprising stream, wherein the liquid comprising stream is introduced into the expanded section during at least part of the polymerization process, and wherein the liquid comprising stream is brought into contact with at least part of the interior surface of the expanded section.

Process for the polymerization of olefins

The present invention relates to a process for the continuous preparation of polypropylene in a reactor from propylene and optionally ethylene and/or at least one other oolefin monomer, wherein the reactor comprises a fluidized bed, an expanded section located at or near the top of the reactor, a distribution plate located at the lower part of the reactor and an inlet for a recycle stream located under the distribution plate, wherein the process comprises&#x2014;feeding a polymerization catalyst to the fluidized bed in the area above the distribution plate&#x2014;feeding the propylene and the optional at least one other oolefin monomer to the reactor&#x2014;withdrawing the polypropylene from the reactor&#x2014;circulating fluids from the top of the reactor to the bottom of the reactor, wherein the circulating fluids are compressed using a compressor and cooled using a heat exchanger, resulting in a cooled recycle stream comprising liquid, and wherein the cooled recycle stream is introduced into the reactor using the inlet for the recycle stream wherein an alkane chosen from the group of iso-butane, n-butane, cyclopropane and mixtures thereof is added to the reactor and wherein the molar composition of the components in the recycle stream is chosen such that the dew temperature of the recycle stream at the reactor pressure is at least 0.10&#xb0; C. below the temperature of the reactor.

A procatalyst for polymerization of olefins, which procatalyst is based on a magnesium compound of the formula MgR'R&#x2033; wherein R&#x2032; is an alkoxide or aryloxide group and R&#x2033; is an alkoxide or aryloxide group or halogen, an activator being a monoester and an internal donor represented by a compound according to formula A: as described herein. Also described is a polymerization catalyst system comprising the procatalyst, a co-catalyst and optionally an external electron donor; a process of making a polyolefin, by contacting an olefin with the catalyst system; a polyolefin, obtained by or obtainable by the process; and a polyolefin, having a molecular weight distribution of between 4 and 15, a molecular weight (M) of between 300,000 to 1,500,000 g/mol, a melting temperature of more than 150&#xb0; C., a value for the xylene solubles of less than 4 wt. % and a shaped article therefrom.

The present invention relates to a process for the continuous preparation of a polyolefin in a reactor from one or more &#x3b1;-olefin monomers of which at least one is ethylene or propylene, wherein the reactor comprises a fluidized bed, an expanded section located at or near the top of the reactor, a distribution plate located at the lower part of the reactor and an inlet for a recycle stream located under the distribution plate, wherein the process comprises&#x2014;feeding a polymerization catalyst to the fluidized bed in the area above the distribution plate&#x2014;feeding the one or more &#x3b1;-olefin monomers to the reactor&#x2014;withdrawing the polyolefin from the reactor&#x2014;circulating fluids from the top of the reactor to the bottom of the reactor, wherein the circulating fluids are cooled using a heat exchanger, resulting in a cooled recycle stream comprising liquid, and wherein the cooled recycle stream is introduced into the reactor using the inlet for the recycle stream wherein a stream comprising a thermal run away reducing agent (TRRA-containing stream) is introduced into the expanded section during at least part of the polymerization process, wherein said TRRA-containing stream is brought into contact with at least part of the interior surface of the expanded section.

The invention relates to a composition comprising A) polyolefin and B) one or more compounds selected from the group of galactopyranoside derivatives, galactopyranose derivatives, mannopyranoside derivatives, mannopyranose derivatives, mannofuranoside derivatives and mannofuranose derivatives, wherein the amount of component B) is from 0.25 to 5 wt % based on the total composition. The invention relates to use of the composition in injection molding.

Polyolefin compositions

The invention relates to a process for the preparation of ethylene-propylene copolymers having &#x2014;a weight average molecular weight of 800,000-1,800,000, &#x2014;a molecular weight distribution of 3-8, &#x2014;an ethylene content of 1-10 wt %, preferably 1.5 to 5.5 wt %. &#x2014;a melt flow in the range of 1.5-8 dg/min measured with a load of 21.6 kg at 230&#xb0; C. and &#x2014;a xylene soluble content of 2-15 wt % by converting propylene into the UHMWEP copolymer without pre-polymerization in the presence of a polymerization catalyst under a condition where the volume ratio of Hto propylene is at most 0.0020, wherein the catalyst comprises a catalyst component and a co-catalyst, wherein the catalyst component is obtained by a process wherein a compound with formula Mg(OAIk)Clwherein x is larger than 0 and smaller than 2, y equals 2&#x2212;x and each Alk, independently, represents an alkyl group, is contacted with a titanium tetraalkoxide and/or an alcohol in the presence of an inert dispersant to give an intermediate reaction product and wherein the intermediate reaction product is contacted with titanium tetrachloride in the presence of an internal donor.

Growing community of inventors

Riyadh, Saudi Arabia

Ahmad Abdullah Alshaiban