EP2931817A1 - Matériaux fonctionnels à réticulation réversible - Google Patents

Matériaux fonctionnels à réticulation réversible

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Publication number
EP2931817A1
EP2931817A1 EP13791781.1A EP13791781A EP2931817A1 EP 2931817 A1 EP2931817 A1 EP 2931817A1 EP 13791781 A EP13791781 A EP 13791781A EP 2931817 A1 EP2931817 A1 EP 2931817A1
Authority
EP
European Patent Office
Prior art keywords
temperature
formulation
crosslinking
group
formulation according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP13791781.1A
Other languages
German (de)
English (en)
Inventor
Christopher Barner-Kowollik
Kim Klaus ÖHLENSCHLÄGER
Stefan Hilf
Friedrich Georg Schmidt
Nathalie GUIMARD
Jan Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Evonik Roehm GmbH
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 Evonik Roehm GmbH filed Critical Evonik Roehm GmbH
Publication of EP2931817A1 publication Critical patent/EP2931817A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
    • 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
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • 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
    • C08F234/00—Copolymers of cyclic compounds having no unsaturated aliphatic radicals in a side chain and having one or more carbon-to-carbon double bonds in a heterocyclic ring
    • C08F234/04—Copolymers of cyclic compounds having no unsaturated aliphatic radicals in a side chain and having one or more carbon-to-carbon double bonds in a heterocyclic ring in a ring containing sulfur
    • 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
    • C08F236/22—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 three or more carbon-to-carbon double bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D11/00—Inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D141/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING 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
    • C09D147/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J141/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J147/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • 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
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
    • C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate

Definitions

  • the present invention relates to a novel method for the reversible crosslinking of, for example, adhesive or coating compositions and a storage-stable composition at room temperature for carrying out this crosslinking reaction.
  • the reversible crosslinking method allows for very fast crosslinking even at a low first temperature and a solution of crosslinking sites at higher temperatures, so that thermoplastic processability is recovered and e.g. the originally bonded substrates can be easily separated again. It is a particular aspect that multiple cycles of crosslinking and solution of crosslinking sites are possible with the present system.
  • the system used for reversible crosslinking is characterized in that it consists of two components A and B, component A being a compound having at least two protected dithioesters, preferably cyanodithioesters, and component B a compound having at least two diene functionalities is.
  • reversibly cross-linkable polymers can also be used in various applications.
  • DE 198 32 629 and DE 199 61 940 describe processes in which adhesives based on epoxy, urea, (meth) acrylate or isocyanate are thermally decomposed.
  • the adhesive formulation from DE 199 61 940 contains a thermally unstable substance, which is activated when heated.
  • the adhesive layer in DE 198 32 629 is destroyed by a particularly high energy input. The deactivation of the adhesive layer is irreversible in both cases.
  • Dithioester group and a dienyl end group are described in Inglis et al.
  • No. 6,933,361 describes a system for the production of easily repairable, transparent moldings.
  • the system consists of two
  • EP 2 536 797 discloses a reversibly crosslinking system consisting of two components A and B.
  • Component A is a compound having at least two dienophilic groups and component B is a compound having at least two diene functionalities.
  • the combinations of components A and B disclosed in EP 2 536 797 can still be optimized in relation to the maximum number of possible switching cycles and the storage stability of the compositions.
  • the object of the present invention is to provide an improved reversible crosslinking method based on the combination of compounds having at least two dienophilic groups and at least two dienes.
  • This crosslinking method should be usable in different applications and in a broad formulation spectrum.
  • the components used for the cross-linking are particularly stable in storage and easily thermally activated in a pre-formulated mixture of all components.
  • the object is a reversible crosslinking method for
  • Crosslinking mechanism that can be used independently of the formulation components such as binders for various polymers.
  • the mechanism also provides new reversibly crosslinkable formulations. Surprisingly, it was found that the tasks set by a
  • Formulation which is crosslinkable by means of a Diels-Alder or a hetero-Diels-Alder reaction, can be solved.
  • This formulation is distinguished by the fact that it is storage-stable at room temperature without crosslinking, reacts with crosslinking at a temperature Ti and at least 80% dissolves the crosslinking points again at a temperature T 2 which is higher than Ti.
  • the formulations according to the invention contain a component A which has at least two dienophilic double bonds and a component B which has at least two diene functionalities.
  • a component A which has at least two dienophilic double bonds
  • a component B which has at least two diene functionalities.
  • at least one of these two components A or B must have more than two, preferably at least three, of the respective functionalities.
  • a system with two functional groups each in components A and B does not react under
  • the component having at least three functionalities may be a polymer and the component having two functionalities may be a low molecular weight substance or an oligomer.
  • the component having at least three functionalities is an oligomer or a low molecular weight substance and the component having two functionalities is a polymer.
  • both components are polymers.
  • both components have at least three functionalities, regardless of which of the two Components is a polymer.
  • both components are polymers having at least three functionalities.
  • components A and B are each a polymer
  • these polymers may be different or the same polymers, differing only in functional groups.
  • the polymers may be polyacrylates, polymethacrylates, polystyrenes, copolymers of acrylates, methacrylates and / or styrenes, polyacrylonitrile, polyethers, polyesters, polylactic acids, polyamides, polyesteramides, polyurethanes, polycarbonates, amorphous or partially crystalline poly- ⁇ -olefins, EPDM, EPM, hydrogenated or non-hydrogenated polybutadienes, ABS, SBR, polysiloxanes and / or block, comb and / or star copolymers of these polymers.
  • These star polymers can have over 30 arms.
  • the composition of the arms can vary and be composed of different polymers. Again, these arms may in turn have branching points.
  • the comb polymers can have a block structure and variable comb arms.
  • (meth) acrylates is alkyl esters of acrylic acid and / or methacrylic acid.
  • a particular aspect of the invention is that the formulation is crosslinkable at room temperature and the crosslinking at a higher temperature can be reversed to such an extent that a liquid, ungelled mass results, e.g. can be formed by conventional in the thermoplastic processing method.
  • the dienophile according to the invention is a protected one
  • the dithioester used as the basis for the undonophilic component used according to the invention thus has the structure wherein Z is a strongly electron-withdrawing group at R m is a Gridbindige organic group, preferably based on
  • R m may also be a polymer.
  • the number of dithioester groups n is a number between 2 and 20, preferably between 2 and 10 and particularly preferably between 2 and 4.
  • the group Z is a 2-pyridyl group, a phosphoryl group, a sulfonyl group, a cyano or trifluoromethyl group.
  • Z is more preferably a cyano group
  • the protected dithioester used according to the invention as dienophile is a dithioester protected with cyclopentadiene and thus a compound having the following structure:
  • R n is a coupling group by means of which the protected dithioester group is coupled to R m .
  • An example of such a group is a benzyl radical.
  • divalent alkyl radicals having up to 10 carbon atoms, other divalent aromatic radicals or divalent oligoether radicals are accordingly as follows:
  • difunctional crosslinker is represented by the following compound derived from the reaction of isophorone diisocyanate and cyclopentadiene
  • trifunctional crosslinker is the following compound prepared from the reaction of the trimer of hexamethylene diisocyanate and the cyclopentadiene protected crosslinker:
  • the selection of the compounds selected for the formation of the protective groups is not limited to pure Cydopentadiene. According to the invention is essential in the selection of the protective groups only that they are reacted with a dithioester to a protected compound, thereby forming a stable compound at room temperature and at temperatures of about 80 ° C or below 80 ° C to a large extent, the means to be at least 80% again - with the formation of dithioester - removable. This reaction step preferably takes place at
  • Methylcyclopentadiene tetramethyl-Cp, 1,3-cyclohexadienes, spiro [2,4] hepta-4,6-dienes and trimethylsilyl-cyclopentadienes.
  • the activation takes place at an activation temperature Ti, which is at least 35 ° C and at least 5 ° C, preferably at least 10 ° C below the Entnetzungstemperatur T 2 .
  • the temperature Ti is preferably between 40 and 85 ° C., more preferably between 40 and 80 ° C.
  • the dewetting temperature T 2 is according to the invention at least 5 ° C, preferably at least 10 ° C above the activation temperature Ti.
  • the dewetting temperature T 2 is preferably between 75 and 200 ° C., more preferably between 85 and 150 ° C.
  • Property loss of the network can be performed.
  • Component B is a compound with at least two diene groups. These diene groups are known to those skilled in the art. A known example is cyclopentadienyl, substituted cyclopentadienyl or sorbinyl groups.
  • component B is a by means
  • Atomic transfer radical polymerization herg answerss, bifunctional
  • the functionalization with the diene groups can be carried out by a polymer-analogous or during the termination carried out substitution of terminal halogen atoms. This substitution can be carried out, for example, by adding dieno functionalized mercaptans.
  • An exemplary polymerization reaction between a difunctional diene and a difunctional dienophile may be as follows. If one uses at least one of the two components at least trifunctional one comes to a corresponding reversible crosslinking reaction:
  • Another aspect of the present invention is the process for reversible crosslinking.
  • a formulation of at least two different components A and B is activated by means of a Diels-Alder or a hetero-Diels-Alder reaction at the activation temperature Ti and crosslinked spontaneously thereon.
  • a second process step at a higher temperature, at least 50%, preferably at least 90% and particularly preferably at least 99% of the crosslinking sites are dissolved again by means of a retro-Diels-Alder reaction or a retro-hetero-Diels-Alder reaction.
  • Entnetzungstemperatur T 2 preferably within 5 min, at the most within 10 min, at least 90% by weight, preferably at least 95% by weight and more preferably at least 98% by weight of the formulation in a suitable for the formulation prior to crosslinking solvent again soluble.
  • the crosslinking beforehand was so pronounced that when washing with the same solvent for 5 minutes at most 5% by weight, preferably at most 2% by weight and particularly preferably at most 1% by weight of the formulation could be achieved.
  • Formulation ingredients such as in a coating or Adhesive composition can be added, are not considered in this consideration.
  • formulation in the context of this document exclusively describes components A and B and also an optional crosslinking catalyst.
  • composition additionally includes added components in addition to the formulation.
  • additional components may be additives specially selected for the respective application, such as, for example, fillers, pigments, additives,
  • Compatibility promoters act as a combination of additives, plasticizers, impact modifiers, thickeners, defoamers, dispersing additives, rheology improvers, adhesion promoters, scratch-resistant additives, catalysts or stabilizers act.
  • Formulation in the process first brought together the components A and B, as well as optional further additives. This can be done immediately before activation and subsequent networking. According to the invention, however, there is also the advantageous alternative process that all formulation ingredients are mixed and only when needed - even days or weeks later - are crosslinked by means of the activation temperature Ti.
  • the crosslinking reaction can take place at the activation temperature Ti within 10 minutes, preferably within 5 minutes, more preferably within 2 minutes, and most preferably within one minute.
  • crosslinking catalyst can be added to components A and B after mixing, preferably directly before activation.
  • These crosslinking catalysts are usually strong acids such as trifluoroacetic acid or sulfuric acid or strong Lewis acids such as e.g. Boron trifluoride, zinc dichloride, titanium dichloride diisopropylate or aluminum trichloride.
  • the crosslinking proceeds without a catalyst, for example thermally, to a satisfactory extent.
  • the activation temperature is below the temperature as described for the retro (hetero) Diels-Alder Reaction is needed.
  • the catalystless embodiment is preferred over the addition of a catalyst.
  • the crosslinking without a
  • Catalyst e.g. thermally, be accelerated. This is the
  • the formulation contains, independently of the activation of the crosslinking reaction, a further catalyst containing the
  • Dewetting temperature T 2 of the retro-Diels-Alder or the retro-hetero-Diels-Alder reaction lowers.
  • These catalysts may be, for example, iron or an iron compound.
  • a disadvantage of such catalysts may be that it adversely affects the storage stability of the formulation of components A and B, since such catalysts can simultaneously influence the activation, ie the removal of the protective groups.
  • formulations or processes according to the invention can be used in a wide variety of fields of application.
  • the following list exemplifies some preferred applications, without limiting the invention in any way.
  • Such preferred fields of application are adhesives, sealants, molding compounds, lacquers, paint, coatings,
  • inks are, for example, compositions which are applied thermally and crosslink on the substrate.
  • conductive oligomers or additives to create a conductivity in the
  • an electroconductive ink is obtained, e.g. can be processed by bubble-jet method.
  • compositions which are e.g. porous materials in the expanded state can soak or wet particularly well and as a result of the crosslinking reaction
  • Another application in the field of gluing is, for example, a temporary need to be solved later, as in different
  • crosslinking and de-crosslinking materials described can be found in the FDM (Fused Deposition Modeling) or in 3D printing by means of ink-jet processes with low-viscosity melts.
  • thermoformable fiber composites An example of applications in the field of composite materials are self-healing matrix materials or reversibly crosslinking and thus thermoformable fiber composites.
  • the weight average molecular weights of the polymers were determined by GPC
  • the NMR analyzes were carried out on a Bruker AM 400 MHz spectrometer.
  • Step 1 a Sodium Carbonocvanidodithioate (1 a)
  • the brownish powder is once made from an isobutyl alcohol /
  • Reaction time is slowly added to quench remaining Diisobutylaluminiumhydrids water.
  • To dissolve the white precipitate that forms during quenching add 30 mL conc. HCI solution and 30 mL dichloromethane added. The two phases are separated and the aqueous layer extracted four times with dichloromethane. The organic phases are combined, dried with Na 2 SO 4 . Under reduced pressure, the solvent is removed; it remains white solid in 77% yield (4.40 g, 22.0 mmol).
  • the product was identified as the target product by 1 H NMR spectroscopy.
  • Step 4 cyclopentadiene-blocked cvanodithioester di-linker (IPDI-DTE-Cp) (3a) 1.00 g (3.40 mmol, 2.3 eq.) Cyclopentadiene-blocked cyanodithioester (3) from step 3, 0, 33 g (1.50 mmol, 1 eq.) Of isophorone diisocyanate (IPDI) and 1.00 g (0.0015 mmol, 0.01 eq.) Of dibutyltin dilaurate are placed under nitrogen in a 25 mL two-necked flask and then with 4 mL of dried THF added. This mixture is heated with stirring to 55 ° C and this
  • This invention used as a diene compound is made
  • IPDI Isophorone diisocyanate
  • Example 3 Reaction of the IPDI-SA with the Cp-blocked dienophile from Example 1
  • Templates are added in a constant ratio over a period of five hours in a tempered to 1 10 ° C glass jacketed reactor with thermostat under nitrogen and allowed to polymerize. After the dosing has been completed, the mixture is reheated for a further hour (110 ° C.) and the resulting polymer solution is cooled and discharged. A viscous clear polymer solution is obtained, the composition of which is determined by 1 H NMR spectroscopy.
  • Example 5 Reaction of the PMMA-FU with the Cp-Blocked Dienophile from Example 1
  • Step 4 Based on the dienophile groups and the furfuryl groups used in the polymerization of Example 4, equimolar amounts of the PMMA-FU from Example 4 and the Cp-blocked dienophile from Example 1 (Step 4) are dissolved in dichloromethane and the two solutions are mixed together. Then the dichloromethane is removed in vacuo. The remainder is heated to 75 ° C. After 20 - 60 min reaction time, the heat source was removed.
  • dichloromethane is removed in vacuo. The remainder is heated to 75 ° C. After 20 - 60 min reaction time, the heat source was removed.
  • Example 6 Synthesis of Cp-telechelic poly-n-butyl acrylate (PBA-Cp) These tele-dels used as the diene are a poly-n-butyl acrylate having two terminal cyclopentadiene groups each. Of the
  • Manufacturing process is two-tiered.
  • Step 1 Synthesis of Br-telechelen Polv-n-butyl acrylate using ATRP
  • nBA n-butyl acrylate
  • 1,4-bis (bromoisobutyryloxy) butane 0.35 equivalents of copper (I) oxide, 0.0125 equivalents of copper (II) bromide, and 0.7
  • Step 2 Synthesis of Cp telechelic Polv (nBA) (PnBA-Cp)
  • Nuclear magnetic resonance spectroscopy can be detected.
  • the molecular weight is determined by GPC with calibration against PMMA standards in THF.
  • Example 7 Reaction of the PnBA-Cp with the Cp-Blocked Dienophile from Example 1
  • the product is taken up in a solution of 10 equivalents of 2,3-dimethylbutadiene in toluene and heated to 120 ° C for 30 min.
  • This product is also subjected to a GPC measurement (see Example 7b in Table 1).
  • the 2,3-dimethylbutadiene is required as a diene to scavenge the free cyanodithiocarbonate groups of the dehydrated dienophile. If this were not done, the cyanodithiocarbonates would again react with the diene groups of the compound from Example 6 (according to the invention) on cooling.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
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Abstract

L'invention concerne une méthode innovante pour réaliser la réticulation réversible par exemple de masses adhésives ou de revêtement et une composition stable au stockage à température ambiante pour réaliser cette réaction de réticulation. La méthode de réticulation réversible permet d'effectuer une réticulation très rapide déjà à une première température basse et une dissolution des sites de réticulation à plus haute température, de manière à retrouver une aptitude au traitement thermoplastique et par exemple à pouvoir séparer les uns des autres les substrats initialement collés. Un aspect particulier est qu'il est possible de réaliser plusieurs cycles de réticulation et de dissolution des sites de réticulation avec le présent système. Le système utilisé pour la réticulation réversible se caractérise en ce qu'il est constitué de deux composants A et B, le composant A s'agissant d'un composé d'au moins deux dithioesters protégés, de préférence de cyanodithioesters, et le composé B s'agissant d'un composé ayant au moins deux fonctions diène.
EP13791781.1A 2012-12-11 2013-11-11 Matériaux fonctionnels à réticulation réversible Withdrawn EP2931817A1 (fr)

Applications Claiming Priority (2)

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DE102012222742.3A DE102012222742A1 (de) 2012-12-11 2012-12-11 Funktionsmaterialien mit reversibler Vernetzung
PCT/EP2013/073477 WO2014090492A1 (fr) 2012-12-11 2013-11-11 Matériaux fonctionnels à réticulation réversible

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EP2931817A1 true EP2931817A1 (fr) 2015-10-21

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US (1) US9550851B2 (fr)
EP (1) EP2931817A1 (fr)
JP (1) JP2016505672A (fr)
CN (1) CN104955903B (fr)
AU (1) AU2013357723B2 (fr)
BR (1) BR112015013360A2 (fr)
DE (1) DE102012222742A1 (fr)
HK (1) HK1213936A1 (fr)
WO (1) WO2014090492A1 (fr)

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DE102014203653A1 (de) * 2014-02-28 2015-09-03 Robert Bosch Gmbh Kleben mittels Polymerkettenumbau
EP2982704A1 (fr) 2014-08-06 2016-02-10 Evonik Degussa GmbH Émulsions de polymère réticulées réversibles
JP6568218B2 (ja) 2014-12-23 2019-08-28 ブリヂストン アメリカズ タイヤ オペレーションズ、 エルエルシー 化学線硬化型高分子混合物、硬化高分子混合物、及び関連するプロセス
BR112018010069B1 (pt) 2015-11-23 2022-03-08 Rohm And Haas Company Composição adesiva termicamente reversível, processo para preparar a composição adesiva termicamente reversível, composição adesiva sensível à pressão ativada por calor, revestimento de selagem a quente, etiqueta moldada e etiqueta sem revestimento
WO2017105960A1 (fr) 2015-12-17 2017-06-22 Bridgestone Americas Tire Operations, Llc Cartouches de fabrication additive et procédés pour produire des produits polymères durcis par fabrication additive
EP3532267B1 (fr) 2016-10-27 2023-03-01 Bridgestone Americas Tire Operations, LLC Procédés de production de produits polymères durcis par fabrication additive
DE102019113431A1 (de) 2018-06-28 2020-01-02 Bundesdruckerei Gmbh Verfahren und Vorrichtung zur Kennzeichnung einer Datenseite, insbesondere für ein Wert- und/oder Sicherheitsdokument
CN111607086A (zh) * 2020-05-27 2020-09-01 南雄中科院孵化器运营有限公司 一种高导热可重塑液晶弹性体复合材料及制备方法与应用
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EP3199575A1 (fr) 2016-01-29 2017-08-02 Evonik Degussa GmbH Nouvel agent de reticulation d'hetero-diels-alter et son utilisation dans des systemes polymeres a reticulation reversible
WO2017129483A1 (fr) 2016-01-29 2017-08-03 Evonik Degussa Gmbh Nouveaux agents de réticulation par la réaction d'hétéro-diels-alder et leur utilisation dans des systèmes polymères à réticulation réversible

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BR112015013360A2 (pt) 2017-07-11
AU2013357723A1 (en) 2015-07-09
DE102012222742A1 (de) 2014-03-27
JP2016505672A (ja) 2016-02-25
CN104955903A (zh) 2015-09-30
US20150299363A1 (en) 2015-10-22
WO2014090492A1 (fr) 2014-06-19
US9550851B2 (en) 2017-01-24
CN104955903B (zh) 2017-05-24
AU2013357723B2 (en) 2016-09-29
HK1213936A1 (zh) 2016-07-15

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