MX2017000884A - Catalizadores. - Google Patents

Catalizadores.

Info

Publication number
MX2017000884A
MX2017000884A MX2017000884A MX2017000884A MX2017000884A MX 2017000884 A MX2017000884 A MX 2017000884A MX 2017000884 A MX2017000884 A MX 2017000884A MX 2017000884 A MX2017000884 A MX 2017000884A MX 2017000884 A MX2017000884 A MX 2017000884A
Authority
MX
Mexico
Prior art keywords
lll
epoxide
catalysts
lactide
lactone
Prior art date
Application number
MX2017000884A
Other languages
English (en)
Inventor
Kember Michael
chapman Andy
CHARTOIRE Anthony
ADRIAENNSENS Louis
Leeland James
Original Assignee
Econic Tech Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB201412990A external-priority patent/GB201412990D0/en
Priority claimed from GB201412992A external-priority patent/GB201412992D0/en
Priority claimed from GB201412986A external-priority patent/GB201412986D0/en
Application filed by Econic Tech Ltd filed Critical Econic Tech Ltd
Publication of MX2017000884A publication Critical patent/MX2017000884A/es

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B01J31/181Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
    • B01J31/1825Ligands comprising condensed ring systems, e.g. acridine, carbazole
    • B01J31/183Ligands comprising condensed ring systems, e.g. acridine, carbazole with more than one complexing nitrogen atom, e.g. phenanthroline
    • B01J31/1835Ligands comprising condensed ring systems, e.g. acridine, carbazole with more than one complexing nitrogen atom, e.g. phenanthroline comprising aliphatic or saturated rings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22Organic complexes
    • B01J31/2204Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208Oxygen, e.g. acetylacetonates
    • B01J31/2226Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
    • B01J31/223At least two oxygen atoms present in one at least bidentate or bridging ligand
    • B01J31/2239Bridging ligands, e.g. OAc in Cr2(OAc)4, Pt4(OAc)8 or dicarboxylate ligands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22Organic complexes
    • B01J31/2204Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/2208Oxygen, e.g. acetylacetonates
    • B01J31/2226Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
    • B01J31/2243At least one oxygen and one nitrogen atom present as complexing atoms in an at least bidentate or bridging ligand
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/22Organic complexes
    • B01J31/2204Organic complexes the ligands containing oxygen or sulfur as complexing atoms
    • B01J31/226Sulfur, e.g. thiocarbamates
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D257/00Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
    • C07D257/02Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms not condensed with other rings
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D285/00Heterocyclic compounds containing rings having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by groups C07D275/00 - C07D283/00
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D487/00Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
    • C07D487/02Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/08Bridged systems
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/785Preparation processes characterised by the apparatus used
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/82Preparation processes characterised by the catalyst used
    • C08G63/823Preparation processes characterised by the catalyst used for the preparation of polylactones or polylactides
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G64/00Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
    • C08G64/20General preparatory processes
    • C08G64/32General preparatory processes using carbon dioxide
    • C08G64/34General preparatory processes using carbon dioxide and cyclic ethers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/02Compositional aspects of complexes used, e.g. polynuclearity
    • B01J2531/0213Complexes without C-metal linkages
    • B01J2531/0216Bi- or polynuclear complexes, i.e. comprising two or more metal coordination centres, without metal-metal bonds, e.g. Cp(Lx)Zr-imidazole-Zr(Lx)Cp
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/02Compositional aspects of complexes used, e.g. polynuclearity
    • B01J2531/0238Complexes comprising multidentate ligands, i.e. more than 2 ionic or coordinative bonds from the central metal to the ligand, the latter having at least two donor atoms, e.g. N, O, S, P
    • B01J2531/0241Rigid ligands, e.g. extended sp2-carbon frameworks or geminal di- or trisubstitution
    • B01J2531/0252Salen ligands or analogues, e.g. derived from ethylenediamine and salicylaldehyde
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/10Complexes comprising metals of Group I (IA or IB) as the central metal
    • B01J2531/16Copper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/20Complexes comprising metals of Group II (IIA or IIB) as the central metal
    • B01J2531/22Magnesium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/20Complexes comprising metals of Group II (IIA or IIB) as the central metal
    • B01J2531/23Calcium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/20Complexes comprising metals of Group II (IIA or IIB) as the central metal
    • B01J2531/26Zinc
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/30Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
    • B01J2531/31Aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/40Complexes comprising metals of Group IV (IVA or IVB) as the central metal
    • B01J2531/46Titanium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/50Complexes comprising metals of Group V (VA or VB) as the central metal
    • B01J2531/56Vanadium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/60Complexes comprising metals of Group VI (VIA or VIB) as the central metal
    • B01J2531/62Chromium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/70Complexes comprising metals of Group VII (VIIB) as the central metal
    • B01J2531/72Manganese
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84Metals of the iron group
    • B01J2531/842Iron
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84Metals of the iron group
    • B01J2531/845Cobalt
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2531/00Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80Complexes comprising metals of Group VIII as the central metal
    • B01J2531/84Metals of the iron group
    • B01J2531/847Nickel

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Nitrogen- Or Sulfur-Containing Heterocyclic Ring Compounds With Rings Of Six Or More Members (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)

Abstract

La presente invención se refiere al campo de catalizadores de polimerización, y sistemas que comprenden tales catalizadores para polimerizar dióxido de carbono y un epóxido, un láctido y/o lactona, y/o un epóxido y un anhídrido. El catalizador es de la fórmula (I): (Ver Fórmula) En donde M1 y M2 están independientemente seleccionados de Zn(II), Cr(II), Co(II), Cu(II), Mn(II), Ni(II), Mg(II), Fe(II), Ti(II), V(II), Cr(III)-X, Co(III)-X, Ni(III)-X, Mn(III)-X, Fe(III)-X, Ca(II), Ge(II), Al(III)-X, Ti(III)-X, V(III)-X, Ge(IV)-(X)2 o Ti(IV)-(X)2. R3A es diferente de R3B; y/o al menos una ocurrencia de E3, E4, E5 y E6 es diferente a una ocurrencia restante de E3, E4, E5 y E6. También se describe un ligando, un proceso de sustitución N asimétrica de un ligando asimétrico y un proceso para la reacción de: (i) diáxido de carbono con un epóxido; (ii) un epóxido y un anhídrido; y/o (iii) un láctido y/o una lactona, en la presencia de un catalizador.
MX2017000884A 2014-07-22 2015-07-22 Catalizadores. MX2017000884A (es)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB201412990A GB201412990D0 (en) 2014-07-22 2014-07-22 Catalysts
GB201412992A GB201412992D0 (en) 2014-07-22 2014-07-22 Catalysts
GB201412986A GB201412986D0 (en) 2014-07-22 2014-07-22 Catalysts
PCT/GB2015/052114 WO2016012785A1 (en) 2014-07-22 2015-07-22 Catalysts

Publications (1)

Publication Number Publication Date
MX2017000884A true MX2017000884A (es) 2017-11-02

Family

ID=53776894

Family Applications (2)

Application Number Title Priority Date Filing Date
MX2017000884A MX2017000884A (es) 2014-07-22 2015-07-22 Catalizadores.
MX2017000880A MX2017000880A (es) 2014-07-22 2015-07-22 Catalizadores.

Family Applications After (1)

Application Number Title Priority Date Filing Date
MX2017000880A MX2017000880A (es) 2014-07-22 2015-07-22 Catalizadores.

Country Status (15)

Country Link
US (4) US10030102B2 (es)
EP (2) EP3171975B1 (es)
JP (2) JP6730273B2 (es)
KR (2) KR102480993B1 (es)
CN (2) CN106536048B (es)
AU (2) AU2015293703B2 (es)
BR (2) BR112017001086B1 (es)
ES (1) ES2962669T3 (es)
MX (2) MX2017000884A (es)
MY (1) MY181918A (es)
PL (1) PL3171975T3 (es)
RU (2) RU2706004C2 (es)
SG (2) SG11201700229VA (es)
TW (2) TWI675700B (es)
WO (2) WO2016012786A1 (es)

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US11180609B2 (en) 2018-08-02 2021-11-23 Saudi Aramco Technologies Company Sustainable polymer compositions and methods
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CN113302224B (zh) 2019-01-31 2023-09-19 陶氏环球技术有限责任公司 聚醚-碳酸酯多元醇的纯化方法
GB201906214D0 (en) 2019-05-02 2019-06-19 Econic Tech Ltd A polyol block copolymer, compositions and processes therefor
GB201906210D0 (en) 2019-05-02 2019-06-19 Econic Tech Limited A polyol block copolymer, compositions and processes therefor
GB202003002D0 (en) 2020-03-02 2020-04-15 Crane Ltd Method of preparation of a polyol block copolymer
GB202003003D0 (en) 2020-03-02 2020-04-15 Econic Tech Ltd A polyol block copolymer
WO2021262845A1 (en) 2020-06-24 2021-12-30 Saudi Aramco Technologies Company Polyol compositions and methods
GB202017531D0 (en) 2020-11-05 2020-12-23 Econic Tech Limited (poly)ol block copolymer
EP4359460A1 (en) 2021-06-23 2024-05-01 Saudi Aramco Technologies Company Polyol compositions and methods
EP4384316A1 (en) 2021-08-11 2024-06-19 Econic Technologies Ltd Method for preparing surfactants by copolymerisation of epoxides and co2 using a mixture of a macrocyclic bimetal catalyst and a double metal cyanide catalyst
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Also Published As

Publication number Publication date
US10030102B2 (en) 2018-07-24
US10774180B2 (en) 2020-09-15
KR20170035999A (ko) 2017-03-31
KR102480993B1 (ko) 2022-12-23
MY181918A (en) 2021-01-14
RU2017105139A3 (es) 2018-12-28
RU2696272C2 (ru) 2019-08-01
TW201609259A (zh) 2016-03-16
KR102523483B1 (ko) 2023-04-20
CN106536048A (zh) 2017-03-22
EP3171975C0 (en) 2023-10-04
AU2015293703A1 (en) 2017-02-02
BR112017001086A2 (pt) 2017-11-21
AU2015293702B2 (en) 2018-11-01
AU2015293703B2 (en) 2019-06-13
RU2017105138A (ru) 2018-08-28
CN106536047B (zh) 2020-10-30
CN106536048B (zh) 2020-05-05
JP6728162B2 (ja) 2020-07-22
EP3171975A1 (en) 2017-05-31
TWI675700B (zh) 2019-11-01
RU2706004C2 (ru) 2019-11-13
BR112017001081A2 (pt) 2017-11-21
US10556988B2 (en) 2020-02-11
KR20170034417A (ko) 2017-03-28
RU2017105139A (ru) 2018-08-28
TW201609258A (zh) 2016-03-16
TWI660778B (zh) 2019-06-01
US20190055352A1 (en) 2019-02-21
ES2962669T3 (es) 2024-03-20
SG11201700229VA (en) 2017-02-27
JP6730273B2 (ja) 2020-07-29
JP2017524064A (ja) 2017-08-24
PL3171975T3 (pl) 2024-01-22
MX2017000880A (es) 2017-08-18
EP3180121A1 (en) 2017-06-21
EP3171975B1 (en) 2023-10-04
JP2017524800A (ja) 2017-08-31
WO2016012786A1 (en) 2016-01-28
EP3180121B1 (en) 2024-06-05
SG11201700233XA (en) 2017-02-27
AU2015293702A1 (en) 2017-02-02
CN106536047A (zh) 2017-03-22
US20200140610A1 (en) 2020-05-07
BR112017001081B1 (pt) 2020-12-29
US20170204221A1 (en) 2017-07-20
US20170210848A1 (en) 2017-07-27
RU2017105138A3 (es) 2018-12-29
WO2016012785A1 (en) 2016-01-28
BR112017001086B1 (pt) 2020-12-15

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