| Braskem S.A. Patent applications |
| Patent application number | Title | Published |
|---|
| 20120009687 | HYBRID CHEMICAL SENSOR, AND, SENSITIVE POLYMERIC COMPOSITION - The present invention relates to chemical sensors with hybrid characteristics, which are thermo-mechanically stable and able to respond to changes in the environment, particularly in the presence of amine and/or amide and/or oxide-reducing compounds, and/or vapor thereof by color change, as well as its incorporation into sensitive polymeric composition. | 01-12-2012 |
| 20110251343 | PROCESS FOR POLYMERIZATION IN THE PRESENCE OF NANOPARTICLES OF A MINERAL FILLER FOR THE ATTAINMENT OF POLYMER NANOCOMPOSITES, AND A POLYMER NANOCOMPOSITE - The present invention refers to a process for the preparation of high performance polymer nanocomposites by means of an in situ continuous or batch polymerization process. More specifically, in this process, the sheet-like (layered) or spherical-like mineral filler is previously swollen with a swelling agent consisting in a saturated or unsaturated hydrocarbon or a polar or vinylic organic compound, in liquid state or near the critical point or in supercritical state, in a stirred continuous flow or batch type reactor, prior to being introduced into a polymerization reactor. The swelling agent is subjected to an endoenthalpic or isoenthalpic phase change upon being mixed with the mineral filler, in order to exfoliate and disperse the same at the nanometric level prior to the polymerization. By means of this process, mineral filler nanoparticles are incorporated and distributed homogeneously throughout the polymer matrix during the polymerization step, allowing the obtainment of a high performance polymer nanocomposite. The present invention further refers to polymer nanocomposites exhibiting differentiated properties compared with the properties of the traditional composites, such as, for example, improved mechanical and barrier properties, enhanced chemical and thermal strength and further, in case of comprising a conductive sheet-like (layered) filler, to the obtainment of a thermally and electrically conductive polymer composite. | 10-13-2011 |
| 20110160043 | PROCESS FOR THE PREPARATION OF CATALYTIC SUPPORT AND SUPPORTED BIMETALLIC CATALYSTS FOR PRODUCTION OF HOMOPOLYMERS AND COPOLYMERS OF ETHYLENE WITH ALPHA-OLEFINS, OF HIGH AND ULTRA HIGH MOLECULAR WEIGHT AND WITH BROAD MOLECULAR WEIGHT DISTRIBUTION IN SLURRY, BULK AND GAS PHASE PROCESSES AND PRODUCTS THEREOF - The present invention relates to a process for the preparation of catalytic support and the supported bimetallic catalysts, used in the production of ethylene homopolymers and ethylene copolymers with α-olefins, of high and ultra high molecular weight with broad molecular weight distribution, in gas or liquid phase polymerization processes, the latter being in slurry, bulk or suspension, and the products obtained from these processes. | 06-30-2011 |
| 20110086992 | PROCESS OF PREPARATION OF CATALYTIC SUPPORT AND SUPPORTED METALLOCENE CATALYSTS FOR PRODUCTION OF HOMOPOLYMERS AND COPOLYMERS OF ETHYLENE WITH ALFA - OLEFINS, OF HIGH AND ULTRA HIGH MOLECULAR WEIGHT AND WITH BROAD MOLECULAR WEIGHT DISTRIBUTION IN SLURRY, BULK AND GAS PHASE PROCESSES AND PRODUCTS THEREOF - The present invention relates a process for the preparation of catalytic support and the supported metallocene catalysts used in the production of ethylene homopolymers and ethylene copolymers with α-olefins, of high and ultra high molecular weight with broad molecular weight distribution, in gas or liquid phase polymerization processes, the latter being in slurry, bulk or suspension, and the products obtained from these processes. | 04-14-2011 |
| 20090209694 | Process for Nanocomposites Preparation, and Nanocomposites - The present invention relates the preparation process of nanocomposites polyolefins based on organophilic clay and polyolefins. More specifically, the present invention relates to a process to prepare nanocomposites, which provides more efficient exfoliation of organophilic clay particles in the polymeric matrix and, hence, a product with significantly improved mechanical, thermal and barrier properties, and good optical properties. | 08-20-2009 |
| 20090171043 | Process of Preparation of Catalytic Support and Supported Bimetalic Catalysts for Production of Homopolymers and Copolymers of Ethylene with Alpha-Olefins of High and Ultra High Molecular Weight and with Broad Molecular Weight Distribution in Slurry, Bulk and Gas Phase Processes and Products Thereof - The present invention relates to a process for the preparation of catalytic support and the supported bimetallic catalysts, used in the production of ethylene homopolymers and ethylene copolymers with □-olefins, of high and ultra high molecular weight with broad molecular weight distribution, in gas or liquid phase polymerization processes, the latter being in slurry, bulk or suspension, and the products obtained from these processes. | 07-02-2009 |
| 20090163682 | Process of Preparation of Catalytic Support and Supported Metallocene Catalysts for Production of Homopolymers and Copolymers of Ethylene with Alfa-Olefins, of High and Ultra High Molecular Weight and with Broad Molecular Weight Distribution in Slurry, Bulk and Gas Phase Processes and Products Thereof - The present invention relates a process for the preparation of catalytic support and the supported metallocene catalysts used in the production of ethylene homopolymers and ethylene copolymers with α-olefins, of high and ultra high molecular weight with broad molecular weight distribution, in gas or liquid phase polymerization processes, the latter being in slurry, bulk or suspension, and the products obtained from these processes. | 06-25-2009 |
| 20090163679 | Suspension polymerization process for manufacturing ultra high molecular weight polyethylene, a multimodal ultra high molecular weight polyethylene homopolymeric or copolymeric composition, a ultra high molecular weight polyethylene, and their uses - The present invention relates to a suspension polymerization process for the production of ultra high molecular weight polyethylene, wherein the operation is carried out in at least two reactors of the CSTR type (continuous stirring tank reactor), in a serial configuration, wherein the first reactor is fed with solvent, monomer and, optionally, comonomer; Ziegler-Natta type catalyst, said catalyst composition having a chloride concentration of at least 55%, based on its composition, and preferably more than 76%, chlorinated cocatalyst and chain growth regulator, said continuous stirring tank reactor being kept under a pressure between 0.1 to 2.0 MPa and temperature from 40° C. to 100° C., which contents of the first reactor are transferred to the subsequent reactor, by means of a pressure differential or through pumping, wherein said subsequent reactors are kept under a pressure between 0.1 to 2.0 MPa and temperature from 40° C. to 100° C., and fed with solvent, monomer, and, optionally, comonomer, catalyst, cocatalyst and chain growth regulator, the pressure and temperature in each of the reactors being different from one another up to the “n | 06-25-2009 |
| 20090123748 | Process for the production of high tensile strength and low creep polymer yarns, high tensile strength and low creep polymer or copolymer yarns, and, the use of such yarns - The present invention relates to a process for the production of high tensile strength and low creep polymer yarns, wherein it comprises the following steps: (a) preparing a mixture of: (i) a first ultra high molecular weight polyolefin polymer or copolymer, (ii) a second clay nanocomposite polyolefin polymer or copolymer, and (iii) a non-polar spinning solvent, (b) feeding the resulting suspension through an extruder at a temperature of at least 180° C., causing the formation of a gel, (c) spinning the gel so obtained in a spinneret with a length to diameter ratio (L/D) of at least 15, (d) cooling the yarn to a temperature below 2° C., (e) subsequently removing the non-polar spinning solvent, and (f) drawing the yarn so obtained so as to obtain a tensile strength value of at least 18 cN/Dtex and a creep value lower than 0.07% per hour, wherein the first ultra high molecular weight polyolefin polymer or copolymer has a weight-average molecular weight higher than 2,000,000 g/mol and a polydispersivity of at least 7, and the second clay nanocomposite polyolefin polymer or copolymer is obtained via in situ polymerization of an olefin and an exfoliated layered clay, the polyolefin so obtained having a weight-average molecular weight of at least 400,000 g/mol. | 05-14-2009 |
| 20080290550 | Process for the preparation of polymer yarns from ultra high molecular weight homopolymers or copolymers, polymer yarns, molded polymer parts, and the use of polymer yarns - A process for the preparation of polymer yarns from ultra high molecular weight homopolymers or copolymers, wherein the process includes the following steps: | 11-27-2008 |
| 20080290549 | Process for the preparation of polymer yarns from ultra high Molecular weight homopolymers or copolymers, polymer yarns,molded polymer parts, and the use of polymer yarns - A process for the preparation of polymer yarns from ultra high molecular weight homopolymers or copolymers, wherein the process includes the following steps:
| 11-27-2008 |
