Patent application number | Description | Published |
20080262174 | Homogeneous Catalyst System For Producing Ethylene Homopolymer or Ethylene Copolymers With Alpha-Olefins - Disclosed is a homogeneous catalyst system for producing an ethylene homopolymer or an ethylene copolymer with α-olefin. Specifically, this invention pertains to a transition metal catalyst which has stability under high temperature solution polymerization at 120˜250° C., in which a cyclopentadiene derivative and an electron donating substituent, both of which are bonded to a Group IV transition metal acting as a central metal, are crosslinked through a silyl derivative substituted with a cyclohexyl, to a catalyst system including such a transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst, and to a method of producing an ethylene homopolymer or an ethylene copolymer with α-olefin, having high molecular weight, using the catalyst system under conditions of high-temperature solution polymerization. The catalyst according to this invention has excellent thermal stability and compatibility with a paraffin hydrocarbon solvent and thus is effective in the production of an ethylene homopolymer or an ethylene copolymer with α-olefin having various properties in commercial polymerization processes. | 10-23-2008 |
20090176948 | Transition metal complexes, and catalysts compositions for preparing ethylene homopolymers or copolymers - Disclosed are a transition metal complex having a high catalytic activity for the preparation of an ethylene homopolymer or a copolymer of ethylene and α-olefin and a catalyst composition comprising the same. More specifically, there are provided a transition metal complex having, around a group IV transition metal, a cyclopentadiene derivative and at least one aryl oxide ligand with a heterocyclic aryl derivative substituted at the ortho-position thereof, with no crosslinkage between the ligands, a catalyst composition comprising the transition metal complex and an organoaluminum compound or boron compound as cocatalyst, and a method for the preparation of high molecular weight ethylene homopolymers or copolymers of ethylene and α-olefin using the same. | 07-09-2009 |
20090176949 | Transition metal complexes, catalyst compositions containing the same, and methods for preparing ethylene homopolymers or copolymers of ethylene and alpha-olefins using the same - The present invention relates to a transition metal complex and a transition metal catalyst composition comprising the same for the preparation of an ethylene homopolymer or a copolymer of ethylene and α-olefin. More particularly, it relates to a group IV transition metal catalyst having a cyclopentadiene derivative and at least one aryl oxide ligand in which an oxygen-containing heterocycle is fused at the ortho-position around a group IV transition metal, with no crosslinkage between the ligands, a catalyst composition comprising the transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst, and a process for preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin using the same. | 07-09-2009 |
20090326175 | ARYLPHENOXY CATALYST SYSTEM FOR PRODUCING ETHYLENE HOMOPOLYMER OR COPOLYMERS OF ETHYLENE AND a-OLEFINS - The present invention relates to an arylphenoxy catalyst system producing an ethylene homopolymer or copolymers of ethylene and α-olefins, and a method of producing an ethylene homopolymer or copolymers of ethylene and α-olefins having a high molecular weight under a high temperature solution polymerization condition using the same. The catalyst system includes a group IV arylphenoxy-based transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst. In the transition metal catalyst, a cyclopentadiene derivative and arylphenoxide as fixed ligands are located around the group IV transition metal, arylphenoxide is substituted with at least one aryl derivative and is located at the ortho position thereof, and the ligands are not crosslinked to each other. The catalyst includes an environmentally-friendly raw material, synthesis of the catalyst is economical, and thermal stability of the catalyst is excellent. It is useful for producing an ethylene homopolymer or copolymers of ethylene and α-olefins having various physical properties in commercial polymerization processes. | 12-31-2009 |
20100048840 | TRANSITION METAL CATALYTIC SYSTEMS AND METHODS FOR PREPARING ETHYLENE HOMOPOLYMERS OR COPOLYMERS OF ETHYLENE AND OLEFINS USING THE SAME - Disclosed herein is a group IV transition metal catalyst for producing an ethylene homopolymer or an ethylene-olefin copolymers, having high catalytic activity, which includes a cyclopentadiene derivative and one or more anionic ligands having an aryl group substituted with an aryl derivative at an ortho-position thereof around a transition metal, the ligands not being crosslinked to each other, a catalyst system including the group IV transition metal catalyst and an aluminoxane cocatalyst or a boron compound cocatalyst, and a method of producing ethylene homopolymers or ethylene-olefin copolymers using the catalyst system. | 02-25-2010 |
20100137669 | ETHYLENE TETRAMERIZATION CATALYST SYSTEMS AND METHOD FOR PREPARING 1-OCTENE USING THE SAME - Disclosed herein is a method of preparing 1-octene at high activity and high selectivity while stably maintaining reaction activity by tetramerizing ethylene using a chromium-based catalyst system comprising a transition metal or a transition metal precursor, a cocatalyst, and a P—C—C—P backbone structure ligand represented by (R | 06-03-2010 |
20100234545 | ETHYLENE COPOLYMER HAVING MULTIPLE PITCH MOLECULAR WEIGHT DISTRIBUTION AND THE METHOD OF PREPARING THE SAME - Disclosed are an ethylene polymerization process, a catalyst for use in the process, a production method employing the catalyst, and a product produced thereby. More specifically, disclosed is a process of producing an ethylene copolymer from ethylene and an alpha-olefin comonomer, in which the produced ethylene copolymer has a multimodal molecular weight distribution and excellent processability and physical properties, and thus can increase the value and productivity of products, including pipes and films. Particularly, the produced ethylene copolymer has a trimodal or higher molecular weight distribution or density distribution, and thus, when it is a linear low-density copolymer, it has an excellent effect of improving the impact strength of films, and when it is a medium-density ethylene copolymer, it can be produced into pipes, which have slow crack growth rate and can be used even at high temperature. | 09-16-2010 |
20100298512 | TRANSITION METAL COMPLEXES, CATALYSTS COMPOSITION CONTAINING THE SAME, AND PROCESS FOR PREPARING ETHYLENE HOMOPOLYMERS OR COPOLYMERS OF ETHYLENE AND ALPHA-OLEFINS USING THE SAME - The present invention relates to a transition metal complex useful as a transition metal catalyst in the preparation of an ethylene homopolymer or a copolymer of ethylene and an α-olefin, a catalyst composition comprising the same and a process of preparing an ethylene homopolymer or a copolymer of ethylene and an α-olefin using the same. More particularly, it relates to a transition metal complex having a cyclopentadiene derivative and at least one phenyl oxide ligand substituted at the 2-position of phenyl with, for example, a silyl group having a C | 11-25-2010 |
20110152475 | ETHYLENE ALPHA OLEFIN POLYMER FORMED BY USE OF METALLOCENE CATALYST - There is provided a method for producing copolymer that is composed of ethylene and alpha-olefin by a solution polymerization, and more specifically, a method for producing copolymer that is composed of ethylene and aromatic monomer as main components by using a transition metal catalyst including a cyclopentadiene derivative, and one or more anionic ligand having aryloxy group in which an aryl derivative is substituted at an ortho-position | 06-23-2011 |
20120058346 | Multilayer Film - The present invention relates to a multilayer film coextruded from an aliphatic polycarbonate and polylactic acid-based polymer and a method for producing the same. According to the present invention, a multilayer film having excellent adhesive property can be manufactured even without a separate adhesive layer. | 03-08-2012 |
20120065360 | PREPARATION OF POLY(ALKYLENE CARBONATE) CONTAINING CROSS-LINKED HIGH MOLECULAR WEIGHT CHAINS - Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages. | 03-15-2012 |
20120141702 | ETHYLENE COPOLYMER HAVING MULTIPLE PITCH IN MOLECULAR WEIGHT DISTRIBUTION AND THE METHOD OF PREPARING THE SAME - Disclosed are an ethylene polymerization process, a catalyst for use in the process, a production method employing the catalyst, and a product produced thereby. More specifically, disclosed is a process of producing an ethylene copolymer from ethylene and an alpha-olefin comonomer, in which the produced ethylene copolymer has a multimodal molecular weight distribution and excellent processability and physical properties, and thus can increase the value and productivity of products, including pipes and films. Particularly, the produced ethylene copolymer has a trimodal or higher molecular weight distribution or density distribution, and thus, when it is a linear low-density copolymer, it has an excellent effect of improving the impact strength of films, and when it is a medium-density ethylene copolymer, it can be produced into pipes, which have slow crack growth rate and can be used even at high temperature. | 06-07-2012 |
20120157592 | Composition of Rotogravure Hotmelt Ink Containing Polypropylene Carbonate - Provided is an eco-friendly rotogravure hot melt ink composition. More specifically, the present invention provides the rotogravure hot melt ink composition meeting requirements of a carbon footprint system by using, as a vehicle, poly propylene carbonate prepared using carbon dioxide as a raw material. The rotogravure hot melt ink prepared by the composition of the present invention has a higher printing density and more easily performs printing at low temperature than a poly vinyl acetate based hot melt ink according to the related art. | 06-21-2012 |
20120165479 | Method for Improving Thermal Stability of Polypropylene Carbonate - Provided is a method for improving thermal stability of polypropylene carbonate and, more particularly, a method of end capping a molecular chain of polypropylene carbonate using a urethane group by adding isocyanates or diisocyanates to a polypropylene carbonate resin, which may optionally be a mixture containing tertiary polyol, so as to delay thermal degradation of the polypropylene carbonate at a high temperature, thereby securing desired thermal stability. Especially, the method capable of being easily applied to reactive extrusion after preparing the polypropylene carbonate has been proposed, thus simplifying production processes and ensuring economical advantages. Moreover, the above method does not deteriorate transparency and specific smoke density characteristics at combustion, which are advantages of the polypropylene carbonate. | 06-28-2012 |
20120196958 | Polymer Blend Composition Based on Carbon Dioxide and Environment-Friendly Decorating Materials Produced Therefrom - Provided is a polyalkylene carbonate resin composition for producing a decorating material and an environment-friendly polyalkylene carbonate resin decorating material produced therefrom, and more particularly to polyalkylene carbonate resin composition for producing a decorating material in which a polymer additive is input to impart heat resistance and shape stability of the decorating material, a crosslinker and a chain extender is input to improve the processability at a processing temperature, and a flame retardant agent is added to impart a flame retardant effect, and an environment-friendly polyalkylene carbonate resin decorating material produced therefrom. An environment-friendly polyalkylene carbonate resin decorating material having excellent thermal stability, processability, and dimensional stability can be produced by using the composition according to the present invention. | 08-02-2012 |
20130102715 | ECO-FRIENDLY POLY(ALKYLENE CARBONATE) RESIN COMPOSITION FOR HIGH-TRANSPARENCY AND HIGH-GLOSS SHEET - Provided is an eco-friendly poly(propylene carbonate) resin composition for a sheet, which is characterized by using a poly(alkylene carbonate) resin developed by efficiently utilizing carbon dioxide, which is a major contributor to global warding, as a main material, and including appropriate additives, such as, a strength modifier, and a flexibilizer, thereby completely solving environmental hazards controversy of the existing polyvinyl chloride resin products; exhibiting excellent mechanical and thermal properties, processability, post processability (printability, embossing and surface treatment, laminating characteristics) and superior anti-flaming property (low smoke density) and elongation characteristics as compared with the existing polyvinyl chloride resin products; and overcoming an extruding production method which is a small-sized production manner, corresponding to a big defect in thermoplastic plastics emerged as substitutes for polyvinyl chloride resin products and thus applying a calendering process method which is a mass production manner. | 04-25-2013 |
20130172434 | METHOD FOR PREPARING RESIN COMPOSITION FOR EXPANDABLE POLYPROPYLENE CARBONATE AND EXPANDABLE POLYPROPYLENE CARBONATE PREPARED THEREFROM - Provided herein are a method for preparing a resin composition for an expandable polypropylene carbonate and an expandable polypropylene carbonate prepared therefrom. More particularly, the present invention relates to a method for preparing a resin composition for an expandable polypropylene carbonate capable of using supercritical carbon dioxide as a foaming agent and preparing a foam having excellent moldability by an appropriate foaming method, and an expandable polypropylene carbonate prepared therefrom. The expandable polypropylene carbonate capable of having high magnification, excellent thermal stability, and dimensional stability may be prepared by using the resin composition according to the present invention. | 07-04-2013 |
20140037965 | "Multilayer Film" - The present invention relates to a multilayer film coextruded from an aliphatic polycarbonate and polylactic acid-based polymer and a method for producing the same. According to the present invention, a multilayer film having excellent adhesive property can be manufactured even without a separate adhesive layer. | 02-06-2014 |
20140081064 | ETHYLENE TETRAMERIZATION CATALYST SYSTEMS AND METHOD FOR PREPARING 1-OCTENE USING THE SAME - Disclosed herein is a method of preparing 1-octene at high activity and high selectivity while stably maintaining reaction activity by tetramerizing ethylene using a chromium-based catalyst system comprising a transition metal or a transition metal precursor, a cocatalyst, and a P—C—C—P backbone structure ligand represented by (R | 03-20-2014 |
20140206835 | Hot Melt Composition - Provided is a hot melt adhesive composition including aliphatic polycarbonate. With the hot melt adhesive composition according to the present invention, the pyrolysis temperature is low, such that the harmful gas is not generated at the time of waste treatment, resulting in providing an excellent environmentally friendly product. In addition, the hot melt adhesive composition has the low melting temperature to thereby be usable at low temperature and exhibit sufficient adhesive strength. | 07-24-2014 |
20140296474 | PREPARATION OF POLY(ALKYLENE CARBONATE) CONTAINING CROSS-LINKED HIGH MOLECULAR WEIGHT CHAINS - Provided is preparation of poly(alkylene carbonate) through alternating copolymerization of carbon dioxide and epoxide. According to the disclosure, by introducing a diepoxide compound to alternating copolymerization of carbon dioxide and epoxide compound using a metal(III) prepared with salen-type ligands containing quaternary ammonium salt as a catalyst, some of the polymer chains may be cross-linked to thus increase an average molecular weight of the copolymer and extend a distribution of molecular weight. A resin prepared according to this method may have high mechanical strength and rheological advantages. | 10-02-2014 |
20140326313 | Resin Composition for Encapsulating Film of Photovoltaic Module and Photovoltaic Module Using the Same - Provided are a resin composition for an encapsulating film of a photovoltaic module, and a photovoltaic module us ing the same, and more particularly, a resin composition for an encapsulating film of a photovoltaic module, having low moisture permeability and excellent adhesiveness due to thermal compression, and a photovoltaic module using the same, and thus, in the case where the resin composition for an encapsulating film of a photovoltaic module is used for a front sheet, a back sheet, or both of the front and back sheets, of a photovoltaic module, the resin composition can be used without an adhesive due to excellent transparency and durability against ultraviolet light and high adhesive strength with respect to glass, and thus can exhibit excellent compatibility. | 11-06-2014 |