Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
  • C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
  • C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
  • C08F236/08—Isoprene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
  • C08C19/00—Chemical modification of rubber
  • C08C19/22—Incorporating nitrogen atoms into the molecule
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08C—TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
  • C08C19/00—Chemical modification of rubber
  • C08C19/28—Reaction with compounds containing carbon-to-carbon unsaturated bonds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K3/00—Use of inorganic substances as compounding ingredients
  • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
  • C08K3/013—Fillers, pigments or reinforcing additives

Definitions

• the present invention relates to a polymer modified by grafting nitrogenous associative molecules along the chain.
• Modified polymers comprising associative groups along the polymer chain are polymers comprising at least one unit which makes them capable of associating with each other or with a filler by non-covalent bonds.
• An advantage of these polymers is that these physical bonds are reversible under the influence of external factors such as the temperature or the stress time, for example.
• the mechanical properties of these modified polymers are adjustable according to the parameters of the environment of use.
• Such polymers are for example described in the document published under the number WO2010 / 031956.
• This document describes elastomers comprising flexible polymer chains associated with one another by covalently bonded permanent crosslinking bridges and on the other hand by non-covalent crosslinking bridges.
• the molecules grafted onto the elastomers comprise associative groups based on nitrogenous heterocycle allowing the establishment of physical bonds.
• associative groups contemplated in this document are the imidazolidinyl, triazolyl, triazinyl, bis-ureyl and ureido-pyrimidyl groups.
• the elastomers can be reacted with a molecule comprising on the one hand the associative group and on the other hand a reactive group forming a covalent bond with a reactive function carried by the elastomer.
• the object of the present invention is therefore to provide an alternative polymer modification applicable to polymers having no reactive functions, therefore not requiring pre-functionalization of the elastomer.
• This aim is achieved in that the inventors have just discovered that new molecules comprising both at least one associative group and at least one reactive group, make it possible to modify a polymer, comprising at least one double bond, without it being It is necessary for the polymer in question to have reactive functions.
• the subject of the invention is therefore a polymer modified by grafting a compound comprising at least one group Q, and at least one group A connected to one another by at least one and preferably a "spacer" group Sp in which:
• Q comprises a reactive group of azo-dicarbonyl unit
• - A comprises an associative group comprising at least one nitrogen atom
• - Sp is an atom or a group of atoms forming a bond between Q and A.
• the subject of the invention is also a process for preparing the modified polymer defined above by grafting compounds comprising nitrogen-containing associative groups, the polymer not being necessarily functionalized.
• Another subject of the invention is a rubber composition
• a rubber composition comprising an elastomer, preferably diene, modified by grafting with the compound comprising at least one group Q, and at least one group A connected to one another by at least one group and preferably one group Sp Spacer as described above.
• the modification of the elastomer ensures a good polymer-filler interaction, beneficial for the final properties of the composition.
• a tire comprising such a composition is also the subject of the invention.
• the subject of the invention is a polymer modified by grafting a compound comprising at least one group Q, and at least one group A connected to one another by at least one and preferably a "spacer" group Sp as described above.
• polymer is meant according to the invention, any polymer containing at least one unsaturation or double bond capable of reacting with the compound described above.
• the polymers of the present invention are diene elastomers.
• diene elastomers can be classified in known manner into two categories, those said to be essentially unsaturated and those said to be essentially saturated. These two categories of diene elastomers can be envisaged within the scope of the invention.
• An essentially saturated diene elastomer has a level of units or units of diene origin which is weak or very weak (conjugated dienes) which is always less than 15% (mol%).
• some butyl rubber or copolymers of dienes and alpha-olefins EPDM type fall within the definition of substantially saturated diene elastomers.
• essentially unsaturated diene elastomer is understood to mean a diene elastomer derived at least in part from conjugated diene monomers having a proportion of units or units of diene origin (conjugated dienes) which is greater than 15% (mol%).
• conjugated diene monomers having a proportion of units or units of diene origin (conjugated dienes) which is greater than 15% (mol%).
• highly unsaturated diene elastomer is particularly understood to mean a diene elastomer having a content of units of diene origin (conjugated dienes) which is greater than 50%.
• iene elastomer may be used in the invention:
• diene elastomer it is preferred to use at least one diene elastomer of the highly unsaturated type, in particular of the type (a) or (b) above.
• 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-di (C 1 -C 5) alkyl-1,3-butadienes such as for example 2 3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2-methyl-3-ethyl-1,3-butadiene, 2-methyl-3-isopropyl-1, 3-butadiene, aryl-1,3-butadiene, 1,3-pentadiene, 2,4-hexadiene.
• Suitable vinyl aromatic compounds are, for example, styrene, ortho-, meta-, para-methylstyrene, the commercial "vinyl-toluene" mixture, para-tert-butylstyrene, methoxystyrenes, chlorostyrenes, vinylmesitylene, divinylbenzene, vinylnaphthalene.
• the copolymers may contain between 99% and 20% by weight of diene units and between 1% and 80% by weight of vinylaromatic units.
• the elastomers may have any microstructure which is a function of the polymerization conditions used, in particular the presence or absence of a modifying and / or randomizing agent and the amounts of randomizing modifying agent used.
• the elastomers may be, for example, block, random, sequenced or microsequential, and may be prepared in dispersion, in emulsion or in solution; they may be coupled and / or starred or functionalized with a coupling agent and / or starring or functionalization.
• diene elastomers selected from the group consisting of polybutadienes (BR), synthetic polyisoprenes (IR), natural rubber (NR), butadiene copolymers, isoprene copolymers and mixtures of these elastomers.
• Such copolymers are more preferably chosen from the group consisting of natural rubber, homopolymers and copolymers of isoprene such as isoprene-butadiene copolymers (BIR), isoprene-styrene copolymers (SIR), copolymers isoprene-butadiene-styrene (SBIR), and mixtures of such copolymers.
• the polymer having at least one unsaturation or double bond is modified by grafting a compound, also called modifier, comprising at least one group Q, and at least one group A connected to each other by at least one preferably a "spacer" group Sp in which:
• Q comprises an azo-dicarbonyl group
• - A comprises an associative group comprising at least one nitrogen atom
• - Sp is an atom or a group of atoms forming a bond between Q and A.
• sociative group groups capable of associating with each other by hydrogen, ionic and / or hydrophobic bonds. It is according to a preferred embodiment of the invention groups capable of associating by hydrogen bonds.
• each associative group comprises at least one donor "site” and one acceptor site with respect to the hydrogen bonding so that two identical associative groups are self-complementary and can associate with each other forming at least two hydrogen bonds.
• the associative groups according to the invention are also capable of associating by hydrogen, ionic and / or hydrophobic bonds with functions present on fillers.
• the compounds according to the invention comprising a group Q, a group "spacer” and an associative group may for example be represented by the following formula (la):
• the compounds according to the invention comprising two groups Q, a group "spacer” and two associative groups may for example be represented by the following formula (Id):
• the associative group is chosen from an imidazolidinyl, ureyl, bis-ureyl, ureido-pyrimidyl and triazolyl group.
• the group A corresponds to one of the following formulas (II) to (VI):
• R denotes a hydrocarbon group which may optionally contain heteroatoms
• X denotes an oxygen or sulfur atom, or an -NH group, preferably an oxygen atom.
• the group A comprises a di or tri-nitrogen heterocycle, with 5 or 6 atoms, preferably diazotized, and comprising at least one carbonyl function.
• the group A comprises an imidazolidinyl group of formula (II).
• the group Q comprises an azo-dicarbonyl group preferably having the formula:
• W-CO-N N-CO-.
• Z represents an oxygen atom, a sulfur atom or a group -NH or -NR ',
• R represents a C 1 -C 2 alkyl group, preferably a C 1 -C 6 alkyl group, and most preferably a C 1 -C 4 alkyl group, for example methyl or ethyl, or
• Sp ' identical or different from Sp is a divalent spacer group linking the azodicarbonyl functional group to another associative group A',
• a ' identical to or different from A, is an associative group comprising at least one nitrogen atom
• the modifying agents according to the invention are represented by formula (VII)
• W-CO-N N-CO-Sp-A
• modifying agents according to the invention are represented by formulas (VIII) or (IX):
• the "spacer” group Sp makes it possible to connect at least one group Q and / or at least one associative group, A, and thus can be of any type known per se.
• the "spacer” group must not, however, interfere with the Q and associative groups of the compound according to the invention.
• the "spacer” group is preferably a hydrocarbon chain, linear, branched, cyclic, may contain one or more aromatic radicals, and / or one or more heteroatoms. Said chain may optionally be substituted, provided that the substituents are inert with respect to the Q and associative groups.
• the "spacer” group is a linear or branched C1-C24, preferably C1-C10 alkyl chain, optionally comprising one or more heteroatoms chosen from nitrogen, sulfur, silicon or carbon atoms. oxygen, more preferably a C1-C6 linear alkyl chain;
• the "spacer" group Sp or Sp ' is selected from - (CH2) y-, -NH- (CH2) y-, -O- (CH2) y-, y being an integer of 1 to 6.
• the modifying agent according to the invention is chosen from the following compounds of formula (X) or (XI):
• Y represents a divalent group chosen from a methylene group, an oxygen atom, sulfur atom and an -NH- group
• - R represents a C1-C6 alkoxy group, preferably a C1-C4 alkoxy and very preferably methoxy or ethoxy.
• the modifying agent according to the invention may be chosen from the compounds of formulas (XII) to (XV) below:
• the modifying agents according to the invention may be prepared in three stages according to the following general scheme:
• the level of modifying agent ranges from 0.01 to 50 mol%, preferably from 0.01 to 5 mol%.
• the invention also relates to the process for preparing the grafted elastomer described above.
• the grafting of the polymer is done by reacting said polymer with the reactive group (s) carried by the modifying agent. During this reaction, this or these reactive groups form covalent bonds with the polymer chain.
• the grafting of the modifying agent is carried out by "reacting" on at least one unsaturation or double bond of the chain.
• the modification is not carried out by reaction with any functional groups of the polymer. This "ene-reaction” can be illustrated by the mechanism on a polyisoprene described below:
• the grafting of the modifying agent can be carried out in bulk, for example in an internal mixer or an external mixer such as a roller mixer.
• the grafting is then carried out either at a temperature of the external mixer or the internal mixer lower than 60 ° C., followed by a reaction step in a press or in an oven at temperatures ranging from 80 ° C. to 200 ° C., or at a temperature of the external mixer or the internal mixer greater than 60 ° C without subsequent heat treatment.
• the grafting of the modifying agent can also be carried out in solution.
• the grafting process can be carried out continuously or discontinuously.
• the polymer thus modified can be separated from its solution by any type of means known to those skilled in the art and in particular by a stripping operation with steam.
• the grafted elastomer according to the invention can be used for the manufacture of various rubber articles according to methods known to those skilled in the art. It is then implemented within a rubber composition with various other components.
• the invention also relates to a reinforced crosslinked or crosslinkable rubber composition
• a reinforced crosslinked or crosslinkable rubber composition comprising a grafted elastomer as described above.
• reinforcing agents mention may be made of mineral reinforcing fillers, such as silica, and organic reinforcing fillers, such as carbon black.
• a rubber composition there may be mentioned the manufacture of tire for a vehicle.
• the rubber composition once cured, can thus be calendered or extruded in the form of a rubber profile which can be used as a semi-finished vehicle tire.
• the spectra are acquired on a BRUKER 500 MHz spectrometer equipped with a BBIz-grad 5 mm wideband probe.
• the quantitative 1H NMR experiment uses a 30 ° single pulse sequence and a 3 second repetition time between each acquisition.
• the samples are solubilized in carbon disulfide (CS 2 ). 100% of deuterated cyclohexane (C 6 Di 2 ) are added for the lock signal.
• the 2D NMR spectrum HSQC 1 H- 13 C makes it possible to verify the nature of the grafted pattern by virtue of the chemical shifts of the carbon and proton atoms.
• Example 1 Modification in solution of a synthetic polyisoprene comprising more than 90% of 1,4-cis linkages.
• N- (2- (2-oxoimidazolidin-1-yl) ethyl) -1H-imidazole-1-carboxamide (74.0 g, 0.33 mol, purity 88 mol% by NMR) in anhydrous acetonitrile (750 mL) is added at once ethyl hydrazinecarboxylate (38.0 g, 0.36 mol).
• the reaction medium is stirred for 3 hours at 70-75 ° C and then for 2-3 hours at room temperature.
• the precipitate is filtered and washed with acetonitrile (twice 50 ml) and petroleum ether (twice 50 ml, cut 40/60 ° C) and finally dried for 10 - 15 hours at room temperature.
• the molar purity is greater than 95% ( 1 H NMR).
• the polymer is redissolved in toluene and then subjected to an antioxidant treatment by adding 0.14 g of 4,4'-methylene-bis-2,6-tert-butylphenol and 0.14 g of N- (1, 3-dimethylbutyl) -N'-phenyl-p-phenylenediamine.
• the polymer is dried under vacuum for 48 hours at 60 ° C.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Graft Or Block Polymers (AREA)

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• 2010
  • 2010-07-13 FR FR1002937A patent/FR2962732B1/fr not_active Expired - Fee Related
• 2011
  • 2011-07-12 JP JP2013519065A patent/JP5826838B2/ja not_active Expired - Fee Related
  • 2011-07-12 EP EP11734066.1A patent/EP2593487B1/fr not_active Not-in-force
  • 2011-07-12 US US13/809,859 patent/US9481754B2/en not_active Expired - Fee Related
  • 2011-07-12 WO PCT/EP2011/061804 patent/WO2012007443A1/fr not_active Ceased

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