MX2016009302A - Mezclas primarias de bitumen-polimero, utiles para la preparacion de aglutinantes de bitumen-polimero, productos obtenidos a partir de estas mezclas primarias. - Google Patents

Mezclas primarias de bitumen-polimero, utiles para la preparacion de aglutinantes de bitumen-polimero, productos obtenidos a partir de estas mezclas primarias.

Info

Publication number
MX2016009302A
MX2016009302A MX2016009302A MX2016009302A MX2016009302A MX 2016009302 A MX2016009302 A MX 2016009302A MX 2016009302 A MX2016009302 A MX 2016009302A MX 2016009302 A MX2016009302 A MX 2016009302A MX 2016009302 A MX2016009302 A MX 2016009302A
Authority
MX
Mexico
Prior art keywords
primary
bitumen
blends
polymer
preparation
Prior art date
Application number
MX2016009302A
Other languages
English (en)
Other versions
MX386379B (es
Inventor
Loup Frédéric
Original Assignee
Eiffage Infrastructures
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
Application filed by Eiffage Infrastructures filed Critical Eiffage Infrastructures
Publication of MX2016009302A publication Critical patent/MX2016009302A/es
Publication of MX386379B publication Critical patent/MX386379B/es

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/08Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
    • C04B24/085Higher fatty acids
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/28Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/30Condensation polymers of aldehydes or ketones
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B26/00Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
    • C04B26/02Macromolecular compounds
    • C04B26/26Bituminous materials, e.g. tar, pitch
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L65/00Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Compositions of derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06Copolymers with styrene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L91/00Compositions of oils, fats or waxes; Compositions of derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L93/00Compositions of natural resins; Compositions of derivatives thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • C08L95/005Aqueous compositions, e.g. emulsions
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D195/00Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D195/00Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
    • C09D195/005Aqueous compositions, e.g. emulsions
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0075Uses not provided for elsewhere in C04B2111/00 for road construction
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/2038Resistance against physical degradation
    • C04B2111/2046Shock-absorbing materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, i.e. waterproof or water-repellent materials
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J195/00Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J195/00Adhesives based on bituminous materials, e.g. asphalt, tar, pitch
    • C09J195/005Aqueous compositions, e.g. emulsions
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00Coherent pavings made in situ
    • E01C7/08Coherent pavings made in situ made of road-metal and binders
    • E01C7/18Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
    • E01C7/26Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
    • E01C7/265Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with rubber or synthetic resin, e.g. with rubber aggregate, with synthetic resin binder

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Civil Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Architecture (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Road Paving Structures (AREA)
  • Paints Or Removers (AREA)

Abstract

La invención proporciona a bajo costo novedosas mezclas primarias útiles para la preparación de bitúmenes-polímeros. Para este fin, la mezcla primaria de acuerdo con la invención comprende: (a) por lo menos 25 % por peso, de preferencia de 25 a 80 % por peso, de polímero, (b) por lo menos una resina termoplástica adherente de masa molecular promedio comprendida entre 100 y 3 000 g/mol, (c) y/o uno o varios (mono) ésteres alquílicos -de preferencia metílicos- de ácidos grasos con C16-C18, en particular aceite de girasol, aceite de linaza, aceite de colza, aceite de soya y/o aceite de girasol isomerizado o no; el éster (c) necesariamente está presente cuando la resina aglutinante (b) tiene un índice de acidez medido según la norma NF EN ISO 660 inferior a 50 mg de KOH/g. La invención también tiene por objeto bitúmenes-polímeros, emulsiones y recubrimientos/revestimientos obtenidos a partir de esta mezcla primaria y sus procedimientos de preparación.
MX2016009302A 2014-01-21 2015-01-21 Mezclas primarias de bitumen-polímero, útiles para la preparación de aglutinantes de bitumen-polímero, productos obtenidos a partir de estas mezclas primarias. MX386379B (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1450448A FR3016626A1 (fr) 2014-01-21 2014-01-21 Melanges primaires bitume-polymere, utiles pour la preparation de liants bitume-polymere, produits obtenus a partir de ces melanges primaires
PCT/FR2015/050142 WO2015110754A1 (fr) 2014-01-21 2015-01-21 Mélanges primaires bitume-polymère, utiles pour la préparation de liants bitume-polymère, produits obtenus a partir de ces mélanges primaires

Publications (2)

Publication Number Publication Date
MX2016009302A true MX2016009302A (es) 2017-04-10
MX386379B MX386379B (es) 2025-03-18

Family

ID=51167993

Family Applications (1)

Application Number Title Priority Date Filing Date
MX2016009302A MX386379B (es) 2014-01-21 2015-01-21 Mezclas primarias de bitumen-polímero, útiles para la preparación de aglutinantes de bitumen-polímero, productos obtenidos a partir de estas mezclas primarias.

Country Status (18)

Country Link
US (1) US9982135B2 (es)
EP (1) EP3097151B1 (es)
JP (1) JP6751024B2 (es)
KR (1) KR20160113626A (es)
AU (1) AU2015208957B2 (es)
BR (1) BR112016016727B1 (es)
CA (1) CA2937406C (es)
CL (1) CL2016001820A1 (es)
EA (1) EA035370B1 (es)
ES (1) ES2845617T3 (es)
FR (1) FR3016626A1 (es)
MA (1) MA39213B1 (es)
MX (1) MX386379B (es)
MY (1) MY178252A (es)
PE (1) PE20161189A1 (es)
SA (1) SA516371502B1 (es)
SG (1) SG11201605993QA (es)
WO (1) WO2015110754A1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3160950A1 (en) 2019-12-06 2021-06-10 Denis Muki Tibah Compatibilizer precursor, methods, systems, and uses thereof, and formulations including the same
JP2023158941A (ja) * 2022-04-19 2023-10-31 東亜道路工業株式会社 改質アスファルト乳剤、アスファルト混合物およびアスファルト舗装の補修方法
JP7838868B1 (ja) * 2025-07-29 2026-04-01 大有建設株式会社 植物性アスファルト、アスファルト混合物、及びアスファルト混合物の施工方法

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63357A (ja) * 1986-05-10 1988-01-05 Mitsubishi Petrochem Co Ltd アスフアルト舗装材
US6346561B1 (en) 1992-05-20 2002-02-12 Texas Encore Materials, Inc. Pavement material
ES2096346T5 (es) * 1992-11-02 2007-11-01 Exxonmobil Chemical Patents, Inc. Mezclas de copolimeros de etileno para adhesivos de fusion en caliente.
CA2203263C (en) * 1994-10-20 2009-08-18 George F. Thagard, Iii Asphaltic foam
DE19612950C1 (de) 1996-04-01 1997-07-31 Siemens Ag Schaltungsstruktur mit mindestens einem MOS-Transistor und Verfahren zu deren Herstellung
FR2768150B1 (fr) * 1997-09-05 1999-11-26 Saada Sa Liant bitumineux, composition et utilisation
EP1114844A4 (en) * 1999-05-28 2005-03-16 Jsr Corp THERMOPLASTIC ELASTOMER EMULSION AND METHOD OF PRODUCING THE SAME
JP2005082615A (ja) * 2003-09-04 2005-03-31 Taiyu Kensetsu Co Ltd アスファルト改質材及びアスファルト混合物
JP4257187B2 (ja) * 2003-11-20 2009-04-22 新日本石油株式会社 アスフアルト舗装廃材用再生添加剤組成物
US7595356B2 (en) * 2004-03-18 2009-09-29 Latexfalt B.V. Polymer modified bituminous binder with low emissions
US20060089431A1 (en) * 2004-10-25 2006-04-27 Kaneka Corporation Curable composition
JP4366308B2 (ja) * 2004-12-21 2009-11-18 新日本石油株式会社 アスファルト改質材、それを含むアスファルト混合物およびそれを製造する方法
FR2894587B1 (fr) * 2005-12-14 2010-04-16 Total France Liant bitumineux fluxe, fluxant utilise, preparation et applications de ces produits
BRPI0600685A (pt) * 2006-02-24 2007-11-20 Phb Ind Sa blenda polimérica ambientalmente degradável e seu processo de obtenção
EP2390298B1 (en) 2006-09-27 2014-05-07 H.B. Fuller Company Hot melt pressure sensitive adhesive composition that includes vegetable wax and articles including the same
FR2918069B1 (fr) * 2007-06-29 2009-09-04 Bostik S A Sa Hmpsa pour etiquette auto-adhesive decollable
JP4964056B2 (ja) * 2007-08-07 2012-06-27 株式会社カネカ 硬化性組成物
US20120184650A1 (en) * 2009-02-27 2012-07-19 Arrmaz Products, Lp Emulsion of a polymer modified asphalt
FR2951188B1 (fr) 2009-10-14 2012-12-28 Total Raffinage Marketing Solutions-meres fortement concentrees en polymere a base d'huiles d'origine vegetale et/ou animale pour la preparation de compositions bitume/polymere
KR101123783B1 (ko) * 2011-05-24 2012-03-12 금호석유화학 주식회사 셀룰로스 파이버를 혼입한 고분자 개질 중온화 첨가제 및 이를 사용한 아스팔트와 아스팔트 혼합물의 제조방법
US8986831B2 (en) * 2011-05-24 2015-03-24 H. B. Fuller Company Pressure sensitive adhesive tear tape

Also Published As

Publication number Publication date
KR20160113626A (ko) 2016-09-30
MY178252A (en) 2020-10-07
BR112016016727A2 (pt) 2017-08-08
EA035370B1 (ru) 2020-06-03
EP3097151B1 (fr) 2021-01-06
AU2015208957B2 (en) 2019-04-04
SG11201605993QA (en) 2016-08-30
CA2937406A1 (fr) 2015-07-30
JP2017505369A (ja) 2017-02-16
MX386379B (es) 2025-03-18
CA2937406C (fr) 2022-11-01
PE20161189A1 (es) 2016-10-28
BR112016016727B1 (pt) 2021-11-09
WO2015110754A1 (fr) 2015-07-30
MA39213A1 (fr) 2017-03-31
MA39213B1 (fr) 2018-11-30
US9982135B2 (en) 2018-05-29
NZ722923A (en) 2021-02-26
ES2845617T3 (es) 2021-07-27
SA516371502B1 (ar) 2020-06-10
BR112016016727A8 (pt) 2020-06-16
EP3097151A1 (fr) 2016-11-30
JP6751024B2 (ja) 2020-09-02
US20160347953A1 (en) 2016-12-01
AU2015208957A1 (en) 2016-08-18
FR3016626A1 (fr) 2015-07-24
CL2016001820A1 (es) 2016-12-02
EA201691469A1 (ru) 2016-12-30

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