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US20140221542A1 - Crosslinkable composition cross-linkable by real michael addition reaction and resins for use in said composition - Google Patents

Crosslinkable composition cross-linkable by real michael addition reaction and resins for use in said composition Download PDF

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US20140221542A1
US20140221542A1 US14/246,229 US201414246229A US2014221542A1 US 20140221542 A1 US20140221542 A1 US 20140221542A1 US 201414246229 A US201414246229 A US 201414246229A US 2014221542 A1 US2014221542 A1 US 2014221542A1
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component
resin
reactive
crosslinkable
groups
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Inventor
Richard Hendrikus Gerrit Brinkhuis
Antonius Johannes Wilhelmus Buser
Petrus Johannes Maria David Elfrink
Ferry Ludovicus Thys
Nicole MANGNUS-VERHAGEN
Elwin Aloysius Cornelius Adrianus DE WOLF
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Allnex Netherlands BV
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Nuplex Resins BV
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Assigned to NUPLEX RESINS B.V. reassignment NUPLEX RESINS B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: THYS, FERRY LUDOVICUS, MR, MANGNUS-VERHAGEN, NICOLE, MRS, DE WOLF, ELWIN ALOYSIUS CORNELIUS ADRIANUS, MR, BRINKHUIS, RICHARD HENDRIKUS GERRIT, MR, BUSER, ANTONIUS JOHANNES WILHELMUS, MR, ELFRINK, PETRUS JOHANNES MARIA DAVID, MR
Publication of US20140221542A1 publication Critical patent/US20140221542A1/en
Assigned to ALLNEX NETHERLANDS B.V. reassignment ALLNEX NETHERLANDS B.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: NUPLEX RESINS B.V.
Priority to US15/889,291 priority Critical patent/US10647876B2/en
Abandoned 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0201—Oxygen-containing compounds
    • B01J31/0205—Oxygen-containing compounds comprising carbonyl groups or oxygen-containing derivatives, e.g. acetals, ketals, cyclic peroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
    • B01J31/0235—Nitrogen containing compounds
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
    • B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
    • B01J31/0255—Phosphorus containing compounds
    • B01J31/0267—Phosphines or phosphonium compounds, i.e. phosphorus bonded to at least one carbon atom, including e.g. sp2-hybridised phosphorus compounds such as phosphabenzene, the other atoms bonded to phosphorus being either carbon or hydrogen
    • B01J31/0268—Phosphonium compounds, i.e. phosphine with an additional hydrogen or carbon atom bonded to phosphorous so as to result in a formal positive charge on phosphorous
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C—CHEMISTRY; METALLURGY
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    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
    • C08J3/246—Intercrosslinking of at least two polymers
    • 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
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    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
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    • 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
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • 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
    • C08K5/00—Use of organic ingredients
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    • C08K5/21—Urea; Derivatives thereof, e.g. biuret
    • 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
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
    • B01J2231/30—Addition reactions at carbon centres, i.e. to either C-C or C-X multiple bonds
    • B01J2231/34—Other additions, e.g. Monsanto-type carbonylations, addition to 1,2-C=X or 1,2-C-X triplebonds, additions to 1,4-C=C-C=X or 1,4-C=-C-X triple bonds with X, e.g. O, S, NH/N
    • B01J2231/341—1,2-additions, e.g. aldol or Knoevenagel condensations
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2369/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C08J2375/06—Polyurethanes from polyesters

Definitions

  • the present invention relates to a crosslinkable composition cross-linkable by real Michael addition (RMA) reaction and resins for use in said composition.
  • RMA real Michael addition
  • Real Michael Addition is a reaction wherein a reactive component B with at least 2 activated unsaturated groups (hereafter also referred to as the RMA acceptor) and a reactive component A with at least 2 acidic protons C—H in activated methylene or methine groups (hereafter also referred to as the RMA donor) react in the presence of a strong base catalyst.
  • RMA chemistry can be tuned to give very fast curing compositions (also at lower curing temperatures) in coating compositions at acceptable or good pot lives and good material properties, which makes this chemistry very attractive as a basis for coating compositions. Details of RMA cross-linkable compositions using a latent based cross-linking catalyst are described by inventors of the present application in WO2011/055463 which is herewith incorporated by reference.
  • the drying profile (also referred to as the reaction profile or as the curing profile) is the progress of the cross-linking reaction as a function of time. It is required that the drying profile allows build-up of mechanical properties as fast as possible, to help the productivity of the coater.
  • crosslinkable compositions that can be simply cured in ambient conditions, as opposed to for example compositions comprising photo-latent amine catalysts, known from T. Jung et al Park and Lacke October 2003.
  • the object of the invention is to provide improved cross-linkable compositions that provide optimum coating properties in the delicate balance of these apparently counteracting requirements, in particular in crosslinkable compositions having a high solid content.
  • FIG. 1 illustrates the conversion of the acryloyl (as followed by FTIR at 809 cm ⁇ 1 ) in the preferred acryloyl/malonate system using succinimid as component D.
  • an RMA crosslinkable composition comprising at least one crosslinkable component comprising reactive components A and B, each comprising at least 2 reactive groups wherein the at least 2 reactive groups of component A are acidic protons (C—H) in activated methylene or methine groups and the at least 2 reactive groups of component B are activated unsaturated groups (C ⁇ C) and a base catalyst (C) which reactive components A and B crosslink by Real Michael Addition (RMA) reaction under action of the base catalyst, characterised in that the at least one crosslinkable component comprising reactive components A and B in the composition have a total hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • RMA Real Michael Addition
  • the catalyst C is a carbonate salt according to formula X+ROCO2 ⁇ , wherein X+ is a non-acidic cation, preferably quaternary ammonium or phosphonium, and R is hydrogen or a substituted or unsubstituted alkyl, aryl, or aralkyl group. Details of this latent base catalyst are described in WO2011/055463, which is herewith incorporated by reference.
  • the reactive components A and B can be in the form of separate molecules and each independently in the form of polymers, oligomers, dimers or monomers. Therefore, a “cross-linkable component comprising the active component A” is sometimes also referred to herein as component A.
  • Reactive components A and B can be combined in a single molecule.
  • catalyst C can be combined in a single molecule with reactive component A and/or B.
  • the cross-linkable composition comprises an oligomeric or polymeric resin A comprising reactive components A.
  • the invention also relates to oligomeric or polymeric resin A comprising reactive components A having a hydroxy number of less than 60, preferably less than 40, more preferably less than 20 and optionally even less than 10 mg KOH/g solids.
  • the invention further relates to oligomeric or polymeric resin B comprising reactive components B and having a hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • the invention further relates to the use of resin A or resin B or mixtures of resin A and B for the preparation of RMA cross-linkable compositions.
  • Suitable examples of components A containing activated methylene or methine groups are well known in the art.
  • the polymer is a polyester, polyurethane or polycarbonate.
  • the crosslinkable component comprising reactive components A preferably is a polymer comprising one or more reactive components A having a structure according to formula 2:
  • R is hydrogen or an alkyl, aralkyl or aryl substituent and Y and Y′ are same or different substituent groups, preferably alkyl, aralkyl or aryl (R*), alkoxy (—OR*) or a polymer backbone or wherein the —C( ⁇ O)—Y and/or —C( ⁇ O)—Y′ is replaced by CN or phenyl and which polymer has a hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • R is hydrogen
  • the CH2 is the activated methylene
  • R is not hydrogen
  • the C—H is the activated methine.
  • the activated C—H group containing component A is malonate (in Y and Y′ are —OR* in Formula 1) or acetoacetate (Y is —OR* and Y′ is —R* in Formula 1).
  • Preferably more than 50, preferably 60, 70, 80, 90 or 95% of the reactive components A in the crosslinkable component are malonate groups.
  • Components containing both malonate and acetoacetate groups in the same molecule are also suitable.
  • physical mixtures of malonate and acetoacetate group-containing components are suitable.
  • the cross-linkable component comprising reactive component A preferably is a polymer comprising an average of 2 to 20, preferably 4 to 10 active C—H functions per molecule.
  • component A is a malonate containing compound. It is preferred that in the crosslinkable composition the majority of the activated C—H groups are from malonate, that is more than 50%, preferably more than 60%, more preferably more than 70%, most preferably more than 80% of all activated C—H groups in the crosslinkable composition are from malonate.
  • the crosslinking composition comprises a component A, for example a polymer, wherein more than 50%, preferably more than 70%, more preferably more than 80% and most preferably more than 90% of the activated C—H groups are from malonate and a separate component, for example another polymer, oligomer or monomer, comprising activated C—H groups not from malonate, for example acetoacetate.
  • a component A for example a polymer, wherein more than 50%, preferably more than 70%, more preferably more than 80% and most preferably more than 90% of the activated C—H groups are from malonate and a separate component, for example another polymer, oligomer or monomer, comprising activated C—H groups not from malonate, for example acetoacetate.
  • malonate group-containing components for use with the present invention are the malonate group-containing oligomeric or polymeric esters, ethers, urethanes and epoxy esters containing 1-50, more preferably 2-10, malonate groups per molecule.
  • polyesters and polyurethanes are preferred.
  • Such malonate group-containing components have a number average molecular weight (Mn) in the range of from about 100 to about 5000, more preferably, 250-2500, and an acid number of about 2 or less.
  • monomalonates can be used as they have 2 reactive C—H per molecule.
  • Monomeric malonates can, in addition, be used as reactive diluents.
  • the invention also relates to a polymeric or oligomeric resin A, for use in a RMA cross-linkable composition, comprising one or more reactive components A having a structure according to formula 2:
  • R is hydrogen or an alkyl, aralkyl or aryl substituent and Y and Y′ are same or different substituent groups, preferably alkyl, aralkyl or aryl (R*), alkoxy (—OR*) or a polymer backbone or wherein the —C( ⁇ O)—Y and/or —C( ⁇ O)—Y′ is replaced by CN or phenyl and which polymeric or oligomeric resin A has a hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • the polymeric or oligomeric resin is a polyester, polyether, polyepoxy, polyurethane or polycarbonate, more preferably a polyether, polyester or polyurethane, comprising reactive components A, preferably malonate or acetoacetate and preferably in an amount that the resin comprises an average of 2 to 20, preferably 4 to 10 active C—H functions per molecule.
  • reactive components A preferably malonate or acetoacetate and preferably in an amount that the resin comprises an average of 2 to 20, preferably 4 to 10 active C—H functions per molecule.
  • more than 50, preferably 60, 70, 80, 90 or 95% of the reactive components A in the crosslinkable component are malonate groups.
  • Malonate containing resin A is preferred over for example acetoacetate containing resin A because it provides improved pot life and coating hardness.
  • the resin A typically has a number molecular weight between 100-20000 gr/mol, preferably between 250 and 10000 and in view of the rheology of the coating composition and the mechanical properties of the obtained coating more preferably between 300 and 6000 gr/mol and preferably an equivalent weight per reactive component A of 100-2000 gr/mol.
  • the resin acid number this preferably less than 4, preferably less than 3, 2 or 1 mg KOH/gr because a high acid number would result in inactivation of at least a part of the base catalyst.
  • Components B generally can be ethylenically unsaturated components in which the carbon-carbon double bond is activated by an electron-withdrawing group, e.g. a carbonyl group in the alpha-position.
  • Suitable components B are known in the art, for example acryloyl esters, acrylamides, alternatively polyesters based upon maleic, fumaric and/or itaconic acid (and maleic and itaconic anhydride and polyesters, polyurethanes, polyethers and/or alkyd resins containing pendant activated unsaturated groups. Acrylates, fumarates and maleates are preferred.
  • the component B is an unsaturated acryloyl functional component.
  • the acid number of the activated unsaturated group-containing components is sufficiently low to not substantially impair activity of the catalyst, so preferably less than about 2, most preferably less than 1 mg KOH/g.
  • these and other activated unsaturated group-containing components, and their methods of production are generally known to those skilled in the art, and need no further explanation here.
  • the functionality is 2-20
  • the equivalent weight (EQW: average molecular weight per reactive functional group) is 100-2000
  • the number average molecular weight preferably is Mn 200-5000.
  • compositions comprising not only a high solids content but also aimed at a high crosslinking density, with relative high concentrations and functionalities of functional groups, for example in case the component A is a compound, in particular an oligomer or polymer, comprising an average of 2 to 30, preferably 4 to 20 and more preferably 4-10 activate C—H per polymer chain.
  • component A is a compound, in particular an oligomer or polymer, comprising an average of 2 to 30, preferably 4 to 20 and more preferably 4-10 activate C—H per polymer chain.
  • concentrations of the functional groups in components A and B, and their relative stoichiometry, are chosen such that good film properties following cure may be expected, with efficient use of these functional groups.
  • stoichiometries C—H/C ⁇ C are chosen o be from 0.1 to 10, preferably 0.5 to 3, more preferably 0.7 to 3, most preferably 0.8/1.5.
  • the invention also relates to a polymeric or oligomeric resin B for use in a RMA cross-linkable composition
  • a polymeric or oligomeric resin B for use in a RMA cross-linkable composition
  • one or more reactive components B comprising activated unsaturated groups (C ⁇ C), preferably unsaturated acryloyl or maleate functional groups (preferably acryloyl) or an acrylamide and which polymeric or oligomeric resin has a hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • the resin B preferably is a polyester, polyether, polyepoxy, polyurethane or polycarbonate comprising reactive component B and preferably has a number molecular weight between 300 and 20000 gr/mol, preferably between 300 and 10000 or 6000 gr/mol.
  • the prior art commonly uses TMPTA which has a molecular weight of 296.
  • the resin B preferably has a equivalent weight per reactive component A or B of 100-2000 gr/mol and an acid number less than 4, preferably less than 3, 2 or 1 mg KOH/gr.
  • the invention also relates to a resin mixture of polymeric or oligomeric resin A and polymeric or oligomeric resin B as described above for use in a RMA cross-linkable compositions and to the use use of resin A or resin B or of a resin mixture of resin A and resin B as cross-linkable components in an RMA cross-linkable composition.
  • at least one of resin A or resin B comprise at least 3 reactive cross-linking groups for forming a three-dimensional cross-linked network and at least one of resin A or resin B comprises at least two reactive cross-linking groups and wherein resin A or B or both have an average of 3-30 reactive cross-linking groups per polymer or oligomer molecule.
  • the invention also relates to a process for the preparation of the RMA resins A and B according to the invention, in particular, to a process for the preparation of resin A comprising transesterification of a polyol with reactive component A in the form of an carboxylic acid ester (Y and Y′ are alkoxy (—OR*)) and to a process for the preparation of resin B comprising transesterification of a polyol with reactive component B, preferably an acryloyl, in the form of carboxylic acid ester or by direct esterification of a polyol with reactive component B in the form of carboxylic acid.
  • Y and Y′ are alkoxy (—OR*)
  • the relative amounts of the components in the reaction mixture and the reaction time in combination with the reaction temperature are chosen such that the resulting resin A or B has the required low hydroxy number of less than 60, preferably less than 40 and more preferably less than 20 mg KOH/g solids.
  • the hydroxy value will be high in the beginning of the reaction and will gradually decrease as hydroxy groups of the polyol react with reactive component A.
  • the skilled person can calculate the required amounts of components such that the resulting resin A on completion of the reaction has a very low hydroxy value and can determine by known techniques, such as acid-base titration whether the resulting resin has reacted sufficiently long to reduce the hydroxy value to the required level to form resin A or B.
  • the polyester resin used in the present invention can be prepared by copolymerisation of one or more polyols, one or more polyacids, and one ore more esters of malonic acid and/or etylacetoacetic acid.
  • a preferred way of preparing the polyesters of present invention is to prepare in a first step a hydroxylfunctional polyester, and in later step transesterifying the polyester of the first step with esters of malonic or ethylacetoacetic acid and a volatile alcohol, prefeably ethanol or methanol.
  • the hydroxyfunctional polyester can also be prepared by reacting a hydroxyl functional polyester polyol with chain extenders, preferably lactones such as caprolactone, valerolactone, and butyrolactone.
  • chain extenders preferably lactones such as caprolactone, valerolactone, and butyrolactone.
  • this hydroxypolyester can be prepared by reacting a polyester bearing both hydroxyl and acid groups with one or more mono or polyfunctional epoxy compounds.
  • Suitable mono or polyfunctional epoxy compounds are mono-, di- or polyglycidyl ethers of (cyclo)aliphatic or aromatic hydroxyl compounds such as allyl alcohol, butanol, cyclohexanol, phenol, butyl phenol, decanol, ethylene glycol, glycerol, cyclohexane diol, mononuclear di- or trifunctional phenols, bisphenols such as Bisphenol-A or Bisphenol-F, and multinuclear phenols.
  • the polyols of the first step can also be prepared by reacting a hydroxy functional polyester of the first step with a mono- or polyfunctional isocyanate compound.
  • a mono- or polyfunctional isocyanate compound As suitable at least trifunctional isocyanates may be mentioned a wide variety of monomeric and oligomeric polyfunctional isocyanates.
  • the polycarboxylic acids for the preparation of the polyester polyol are preferably selected from the group of acyclic or cyclic polycarboxylic acids, the esters or the anhydrides thereof. Cyclic polycarboxylic acids include aromatic polycarboxylic acids and cycloaliphatic polycarboxylic acids. Included in this polycarboxylic acids are fatty acids, their esters, dimers and higher oligomers and mixtures thereof.
  • esters or the anhydrides thereof such as dimethyl ester and diethyl ester of malonic acid, succinic anhydride, octenyl succinic anhydride (any isomer or mixture of isomers of 4-octenyl-5-hydro-1,3furandione), dodecenyl succinic anhydride (any isomer or mixture of isomers of 4-dodecenyl-5-hydro-1,3-furandione), and mixtures thereof.
  • succinic anhydride any isomer or mixture of isomers of 4-octenyl-5-hydro-1,3furandione
  • dodecenyl succinic anhydride any isomer or mixture of isomers of 4-dodecenyl-5-hydro-1,3-furandione
  • the optionally co-condensed monocarboxylic acids may be aliphatic, cycloaliphatic, aromatic or mixtures thereof.
  • the monocarboxylic acid contains 6 to 18 carbon atoms, most preferably 7 to 14 carbon atoms, such as octanoic acid, 2-ethylhexanoic acid, isononanoic acid, decanoic acid, dodecanoic acid, benzoic acid, hexahydrobenzoic acid, and mixtures thereof.
  • the polyol is a cycloaliphatic or aliphatic polyol having 2 to 15 carbon atoms.
  • Preferred diols include 1,2ethane diol, 1,2-propane diol, 1,3-propane diol, 3-methyl-1,3-propane diol, 2butyl-2-ethyl-1,3-propane diol, dimethylol propionic acid, and 1,4-cyclohexane dimethanol.
  • suitable monofunctional alcohols include alcohols with 6-18 carbon atoms such as 2-ethyl hexanol, dodecanol, cyclohexanol and trimethyl cyclohexanol.
  • the optionally co-condensed monocarboxylic acids may be aliphatic, cycloaliphatic, aromatic or mixtures thereof.
  • the monocarboxylic acid contains 6 to 18 carbon atoms, most preferably 7 to 14 carbon atoms, such as octanoic acid, 2-ethylhexanoic acid, isononanoic acid, decanoic acid, dodecanoic acid, benzoic acid, hexahydrobenzoic acid, and mixtures thereof.
  • Typical hydroxy acids that can be used include dimethylol propionic acid, hydroxypivalic acid, and hydroxystearic acid.
  • Suitable monofunctional epoxy compounds include the glycidyl esters of branched Monocarboxylic acids such as Cardura(R) E from Resolution.
  • Polyurethane, polyether polyols can be prepared in the known manner using suitable monomers as described above.
  • the oligomer or polymer constituents of resin A are chosen such that the glass transition temperature of the resin A is between ⁇ 25 and +25° C., more preferably between ⁇ 20 and +20° C. and most preferably between ⁇ 20 and +15° C.
  • the glass transition temperature of resin B can be chosen between wider ranges, preferably between ⁇ 50 and +25° C.
  • the resins can be aliphatic or a mix of aliphatic and aromatic constituents with an aromatic constituents percentage chosen in view of the envisaged application.
  • the amount of aromatic compounds in resin A and in resin B and also in a mixture of resin A and Resin B is preferably at most 60 wt % (relative to the total weight of the resin or resin mixture), preferably at most 40, 20 or 10 wt %. Good results were obtained in a preferred embodiment wherein resin A and resin B are aliphatic resins, i.e. comprising substantially no aromatic constituents (at most 5 wt %).
  • the acid number of resin A and B is preferably less than 1 mg KOH/g solids.
  • the molecular weight is preferably low between 300 and 6000 gr/mol.
  • the hydroxy number is preferably as low as possible; most preferably less than 20 and optionally even less than 10 mg KOH/g solids. Even though the molecular weight is relatively low, in view of the mechanical properties of the resulting coating, the Resins must have sufficient cross-linking functionality.
  • resin A and resin B have an average functionality of 3-30 reactive cross-linking groups per polymer or oligomer molecule.
  • the functionality is preferably between 5 and 30, more preferably between 10 and 30.
  • Suitable combinations can be a mixture of resin A with relatively high functionality and resin B with a relatively low functionality, in particular resin A with functionality between 10 and 30 and resin B with a functionality of 3-20 or 3-10.
  • the base catalyst C can in principle be any known catalyst suitable for catalyzing RMA reactions.
  • the cross-linking composition comprises a catalyst system C comprising a strong based blocked by a volatile acid which is activated by evaporation of this acid.
  • a suitable catalyst system C comprises a strong base blocked by a carbon dioxide, or the blocked catalytic species are of formula ROCO2 ⁇ , R being a optionally substituted alkyl, preferably C1-C4 radical or hydrogen, preferably the catalyst comprises a blocked base anion and a non-acidic cation, preferably a quaternary ammonium or phosphonium cation.
  • Suitable catalyst C is described in WO2011/055463 herewith incorporated by reference. It is preferred that the crosslinking catalyst is utilized in an amount ranging between 0.001 and 0.3 meq/g solids, preferably between 0.01 and 0.2 meq/g solids, more preferably between 0.02 and 0.1 meq/g solids (meq/g solids defined as mmoles base relative to the total dry weight of the crosslinkable composition, not counting particulate fillers or pigments).
  • the catalyst system C is activated by reaction of an epoxy component with a tertiary amine, or an anion.
  • component A is a malonate
  • which composition further comprises 0.1-10 wt %, preferably 0.1-5, more preferably 0.2-3 and most preferably 0.5-2 wt % water (relative to total weight of the coating composition).
  • the amount of water is chosen in an effective amount to increase gel time with at least 15 minutes, preferably at least 30 min, more preferably at least 1 h, even more preferably at least 5 h, and most preferably at least 24 h, 48 h. or at least 10%, 50% or 100% compared to the same composition without water.
  • the cross-linkable composition may comprise as an additive to improve appearance and or hardness of the coating an X—H group containing component (D) that is also a Michael addition donor reactable with component B under the action of catalyst C, wherein X is C, N, P, O or S, preferably C, N or P, preferably present in quantities of at least 50 mole % relative to base generated by component C, and less than 30 mole % of C—H active groups from component A.
  • X—H group containing component (D) that is also a Michael addition donor reactable with component B under the action of catalyst C, wherein X is C, N, P, O or S, preferably C, N or P, preferably present in quantities of at least 50 mole % relative to base generated by component C, and less than 30 mole % of C—H active groups from component A.
  • Component D as described in an catalysed RMA crosslinkable composition can create a reactivity profile comprising an initial induction time of lowered reaction rate directly after application and activation of the system, followed by a relative increase of reactivity in later stages.
  • This induction time can be tuned, to allow a “open time” the period allowing flow and solvent and entrapped air bubbles to escape.
  • the induction time allows a significantly higher amount of flow and levelling of the system, avoiding surface defects that may result from very fast cure without these additives, and better hardness build-up due to reduced solvent entrapment, while still benefiting from the full potential of the catalysts beyond this induction time, thus creating an acceleration of the reaction at later stages to complete crosslinking at higher rate than would be found if simply using lower catalyst levels. Also the high sensitivity of lower catalyst levels towards accidentally present acid contaminations is avoided.
  • the crosslinkable composition according to the invention is particularly suitable for making thick layers. Thick layers are considered to be layers having a cured dry thickness of at least 50 or more than 70 micrometers. In thick layer applications the risk of air and solvent inclusions is higher. This is particularly pronounced in RMA crosslinkable compositions that are cured at low temperature in the range from 10 to 60° C. where resins are more viscous and levelling is difficult.
  • the X—H group in component D has a higher acidity than the C—H groups in component A, preferably being characterized in that component D has a pKa (defined in aqueous environment) of at least one unit, preferably two units, less than that of component A.
  • the pKa of the X—H group in component D is lower than 13, preferable lower than 12, more preferably lower than 11 most preferably lower than 10.
  • An excessive acidity may create problems with components in the catalyst system; therefore hence the pKa is preferably higher than 7, more preferably higher than 7.5 and optionally higher than 8.
  • the acidity difference assures that on application of the coating, component D is activated (deprotonated) preferentially over component A.
  • component D is selected from one or more compounds from the group of Compounds D1 comprising C—H acidic protons (X is C) in activated methylene or methine groups and Compounds D2 comprising N—H acidic compound (X is N).
  • Suitable components D2 are an aza-acidic compounds (X is N) preferably comprising a molecule containing the N—H as part of a group Ar—NH—(C ⁇ O)—, —(C ⁇ O)—NH—(C ⁇ O)—, or of a group —NH—(O ⁇ S ⁇ O)— or a heterocycle in which the nitrogen of the N—H group is contained in a heterocyclic ring, more preferably component D2 is an imide derivative, preferably an (optionally substituted) succinimide or glutarimide.
  • Suitable components D2 are hydantoin derivatives, for example 5,5-dimethylhydrantoin, sulfonamides, for example aromatic sulfonamides as benzene- or toluenesulfonamide or heterocyclic compounds, for example triazoles or a pyrazoles, or a uracil derivative.
  • the X—H groups in component D are present in an amount corresponding to at least 50 mole %, preferable at least 100 mole %, most preferably at least 150 mole % relative to the amount of base to be generated by catalyst C.
  • the appropriate amount is very much determined by the acid base characteristics of component D relative to component A, and the reactivity of the corresponding anions relative to B, so may vary for different systems. It is noted that the open time improving effect can in some cases be obtained at very small amounts of component D, which is very advantageous because such small amounts do not or not significantly affect the properties of the resulting cured composition; for example the chemical and mechanical properties of a coating.
  • the X—H groups in component D are present in an amount corresponding to no more than 30 mole %, preferably no more than 20, optionally no more than 10 mole % relative to C—H donor groups from component A.
  • the X—H functionality (number of groups per molecule) of component D is low, preferably less than 4, more preferably less than 2, most preferably it is 1.
  • the crosslinkable composition may comprise next to one or more different components D a component D1 comprising acidic protons (C—H) in activated methylene or methine groups having a higher acidity than component A and which are also is reactive towards component B,
  • component D1 can also contribute to the open time improving effect, however in order to have a significant effect D1 should be typically be present in an amount between 10-40 mol % (relative to total RMA C—H), which is a significantly higher amount than for component D.
  • the difference in acidity of the two C—H acidic components A and D1 is chosen preferably in that wherein the pKa of component D1 is between 0.5 and 6, preferably between 1 and 5 and more preferably between 1.5 and 4 units lower than the pKa of component A.
  • component A is a malonate containing component and component D1 is an acetoacetate or acetylacetone containing component, preferably of low C—H functionality (preferably less than 10, more preferably less than 5, most preferably it is no more than 2.
  • Suitable components D and A2 are listed below with the pKa value.
  • succinimide 9.5 ethosuximide 9.3 5,5-dimethylhydantoin 10.2 1,2,4-triazole 10.2 1,2,3-triazole 9.4 benzotriazole 8.2 benzenesulfonamide 10.1 nitromethane 10.2 isatine 10.3 uracil 9.9 4-nitro-2-methylimidazole 9.6 phenol 10.0 ethylacetoacetate 10.7 acetylacetone 9.0 diethylmalonate 13.0
  • the invention also relates to the use of the component D as described above as an additive to RMA cross-linkable compositions.
  • the advantages of improved appearance and improved hardness can be obtained irrespective of the thickness of the layer but are particularly apparent in thick coating layers having a dry thickness of at least 50, preferably at least 60, 75, 100 and more preferably at least 125 micrometer, for the improvement of the open time of the crosslinkable composition and for the improvement of the appearance and hardness of the resulting cured composition, in particular a coating.
  • component D is chosen to yield, under the application and curing conditions chosen, an increase in time to get to a 30% conversion level, of at least 3, preferably 5, more preferably 10 minutes, preferably less than 60, more preferably less than 30 minutes, when compared to the same composition without component D.
  • the cross-linkable composition can be used without having any additional solvent. This would typically be the case when the cross-linkable components in the composition have sufficient low viscosity and all components together form a solution.
  • a solvent may be added for example to reduce the viscosity in case of high solids content of relatively high viscosity components, to mediate the reaction kinetics or in case the composition contains certain additives that would require the solvent.
  • the solvent can be water or can be an organic solvent or mixtures thereof. Most preferred is to use an organic solvent.
  • the organic solvent may contain (substantially) no water. However, it is sometimes preferred in view of increasing pot life to add in addition to organic solvent also a relatively small amount of water, preferably between 0.1 and 10 wt % (relative to the total weight of the cross-linkable composition).
  • the inventors further found that advantages can be achieved in pot life if in the crosslinkable composition at least part of the solvent is a primary alcohol solvent.
  • the solvent can be a mixture of a non-alcoholic solvent and an alcohol solvent.
  • the alcohol is present in an amount of at least 1, preferably 2, more preferably 3, most preferably at least 5, even more preferably at least 10 wt % relative to the total weight of the crosslinkable composition and in view of VOC constraints preferably at most 45, preferably at most 40 wt %, most preferably less than 30 wt %.
  • the alcohol solvent preferably is one or more primary alcohols, more preferably a mono-alcohol having 1 to 20, preferably 1-10, more preferably 1-6 carbon atoms, preferably selected from the group of ethanol, n-propanol, n-butanol, n-amyl alcohol and butylglycol
  • crosslinkable composition according to the invention comprises
  • the invention also relates to a kit of parts for the manufacture of the composition according to the invention comprising a part 1 comprising components A and B but not C and part 2 comprising component C.
  • a kit of parts for the manufacture of the composition according to the invention comprises a part 1 comprising the cross-linkable components comprising reactive components A and/or B but no C and part 2 comprising component C
  • the invention also relates to the use of the crosslinking composition according to the invention in a method for the manufacture of coating compositions, films or inks and to coating compositions, inks or films comprising the crosslinking composition according to the invention and further application oriented additives for example one or more coating additives like pigments, co-binder, solvents etc.
  • the invention also relates to a process for making a coating layer having a fully cured dry thickness of at least 70, 75, 80 or 100 and more preferably at least 125 micrometer and having a good surface appearance and hardness of the resulting cured composition
  • a process for making a coating layer having a fully cured dry thickness of at least 70, 75, 80 or 100 and more preferably at least 125 micrometer and having a good surface appearance and hardness of the resulting cured composition comprising mixing the components A, B with cayalyst C shortly before use to form a coating composition according to the invention, applying a layer of the coating composition on a substrate and allowing the curing thereof at temperature between 0 and 60° C.
  • Persoz hardness measurement Persoz pendulum hardness was measured in a climatized room at 23° C., and 55+/ ⁇ 5% relative humidity. Hardness is measured with a pendulum acc. Persoz as described in ASTM D 4366.
  • Drying time was determined by firmly pressing the thumb in the paint film. The time was recorded when there was no visible trace left in the paint film.
  • Paints were prepared according the composition in the table.
  • the pigment was dispersed in the mixture of Disperbyk and Sartomer (which is cross-linkable component B: DiTMPTA is di-trimethylolpropane-tetraacrylate) with a high shear stirrer for 15 minutes. Then the other ingredients were added under stirring. Prior to application the catalyst solution was added.
  • Disperbyk and Sartomer which is cross-linkable component B: DiTMPTA is di-trimethylolpropane-tetraacrylate
  • a catalyst solution was formed as follows: to 8.03 g of a 55% solution of tetra-butylammoniumhydroxide were added 11.05 g of diethylcarbonate and 6.74 g of isopropanol.
  • WO 2011/055463 describes in Example 4 Formulations made from a malonate polyester component A-1 and TMPA as the cross-linkable component B-1 and various catalysts.
  • the malonate polyester A-1 had an OH value of 83.2 mg KOH/g. Apart from the hydroxy value, the malonate polyester A-1 is similar to the above described malonate polyester I and II.
  • the catalyst C-5 tetrabutylammonium ethylcarbonate
  • the Perzos hardness was 65 after 1 month curing time, whereas the resin according to the invention having a low hydroxy value as a significantly higher hardness (88) already after three days curing time.
  • Molecular weights were measured by GPC in THF, and expressed in polystyrene equivalent weights. Viscosities were measured with a TA Instruments AR2000Rheometer, using a cone and plate setup (cone 4 cm 1°) at 1 Pa stress.
  • Tube and ball method for pot life determination A flat bottomed test tube (internal diameter 15 mm, length 12.5 cm), carrying two marks, 5 cm apart is filled with 20 ml of paint. A steel ball with a diameter of 8 mm is added, and the tube is closed with a snap cap. The tube is held under an angle of 10° and the steel ball is allowed to roll on the wall of the test tube. The time needed to roll between the two marks is taken as a measure for the viscosity. The time needed to double in viscosity is taken as the pot life. If necessary this time is calculated by linear interpolation between two measurements. This method was used for the pigmented formulations.
  • a glass test tube (length 12 cm, diameter 13 mm) was filled with a stainless steel ball of 12 mm diameter, and the formulation to be studied to leave a very limited head space, and closed. Time was recorded for the ball to fall and pass a distance of 5 cm when the tube was tilted vertically. An average was taken over 2 measurements.
  • Drying recorder drying time For determining the recorder drying time, paint was applied on a glass panel with a doctor blade with a 90 ⁇ gap. The drying time was measured with a Gardco electronic drying time recorder, type DT-5020, set on a cycle time of 60 minutes. Drying time was recorded as the time were the stylus left no more visible trace on the film.
  • TNO cotton ball drying times Dust-dry and tack-free times were measured according to the so-called TNO method with a wad of cotton-wool. Dust-dry time means the time needed for the coating after dropping the wad on the surface of the coating and after leaving it there for 10 seconds, to get no residue of the wool-cotton sticking onto the surface after blowing away the wad. For tack-free time the same holds but now a weight load of 1 kg is applied on the wad for 10 seconds.
  • Persoz hardness measurement Persoz pendulum hardness was measured in a climatized room at 23° C., and 55+/ ⁇ 5% relative humidity. Hardness is measured with a pendulum acc. Persoz as described in ASTM D 4366. For the gradient layer thickness panels, hardness is measured at different spots and corresponding layer thickness is measured. If necessary the hardness at a certain layer thickness is calculated by linear interpolation of the measurement at two different layer thicknesses. Layer thicknesses were measured with a Fischer Permascope MP40E-S.
  • Optical evaluation spayed pigmented paints Paint was sprayed with a devilbiss spraygun, nozzle FF-1.4 with an air pressure of 3.5 bar. The paint was prayed in a continuous layer over the entire surface of a 55 ⁇ 10 cm steel panel. A consecutive layer was sprayed starting 10 cm from the right edge. Several layers were built up, moving to the right so that a layer thickness gradient was build up from the left to right. Films were allowed to dry horizontally at 23° C., 45% RH. Layer thicknesses were measured with a Fischer Permascope MP40E-S. At 100 ⁇ layer thickness, a picture was taken with an Olympus SZX10 microscope (1 ⁇ magn) equipped with a digital camera.
  • Wavescan analysis The panels as described above were analyzed using the Wavescan II of Byk instruments. Data were stored using Autochart software from Byk. Analysis was done in the direction perpendicular to the thickness gradient. In this instrument the light of small laser diode is reflected by the surface of the sample under an angle of 60°, and the reflected light is detected at the gloss angle (60° opposite). During the measurement, the “wave-scan” is moved across the sample surface over a scan length of approx. 10 cm, with a data point being recorded every 0.027 mm. The surface structure of the sample modulates the light of the laser diode. The signal is divided into 5 wavelength ranges in the range of 0.1-30 mm and processed by mathematical filtering.
  • a characteristic value (Wa 0.1-0.3 mm, Wb 0.3-1.0 mm, We 1.0-3.0 mm, Wd 3.0-10 mm, We 10-30 mm) as well as the typical wave-scan-values longwave (LW, approx. 1-10 mm) and shortwave (SW, approx. 0.3-1 mm) is calculated.
  • Low values mean a smooth surface structure.
  • a LED light source is installed in the wave-scan DOI and illuminates the surface under 20 degrees after passing an aperture. The scattered light is detected and a so-called dullness value (du, ⁇ 0.1 mm) is measured.
  • a so-called dullness value (du, ⁇ 0.1 mm) is measured.
  • Disperbyk 163 is a dispersant commercially supplied by Byk;
  • Byk 310 and 315 are additives commercially supplied by ByK;
  • Catalyst solution was prepared by reacting 59.4 g a TBAH solution (40% in water) with 13.5 g DEC (reacting overnight at RT), with 14.5 g isopropanol as co-solvent, following the corresponding ethocarbonate species development. Titration indicated that blocking was complete, and that the concentration of blocked base was 0.83 meq/g solution.
  • Formulations were prepared based on a malonate donor resin A, DiTMPTA as acryloyl donor resin, and the indicated amount of succinimide, and thinned to a viscosity of 160 mPas with a mixture of MEK/BuAc 1:1 by volume. This was mixed with an amount of catalyst solution C1.
  • Catalyst amounts are 50 meq/g solids, water levels are 1.8 wt %, isopropanol at 0.7 wt %, ethanol level estimated at 0.2 wt %.
  • No-D example 1 shows an extremely fast drying
  • the actual Persoz hardness levels are low presumably due to solvent entrapment in the system.
  • the appearance of this No-D example 1 is poor.
  • succinimide significantly higher than the levels of catalyst used
  • some retardation of the drying is seen, but still giving drying times considered as fast; however, it can also be observed that the Persoz hardness development is strongly improved.
  • the example films with succinimide exhibit a better appearance than No-D example 1.
  • Example formulations 5-7, and No-D example formulations 2-3 were prepared as pigmented paints, having compositions as tabulated in Table C (amounts in grams).
  • Example 5 (with succinimide added) exhibits higher Persoz hardness, a better pot life, and a better appearance than No-D example 2 (not containing succinimide).
  • Example 8 was prepared and evaluated in a similar way as discussed above for example 5-7, the composition and results given below in table D (amounts in grams). It can be seen that the additional presence of 1,2,4-triazole (when compared to example 6) leads to a significant improvement in pot-life, other advantages being retained.
  • Example formulations 9 and 10, and No-D example formulations 4 and 5 were formulated and evaluated along similar lines, now also including Wavescan analysis to have a quantitative indication of the quality of the appearance. Compositions and results are given in Table E (amounts in grams).
  • Example formulation 9 can be compared with No-D formulation example 4
  • example formulation 10 can be compared with No-D formulation example 5, difference being the presence of low amounts of succinimide. It can from both comparisons be concluded that the presence of succinimide, besides the improved Persoz hardness, leads to significantly improved values for longwave and shortwave roughness, dullness and DOI.
  • the conversion of the acryloyls in the system can be followed by FTIR, focusing on the 809 cm ⁇ 1 band characteristic of the acryloyl. Doing that, the impact of added succinimide on total conversion can be made visible.
  • Two systems were formulated (according to compositions of No-D example 1 (without succinimide) and example formulation 1 (with 150% succinimide relative to solids).
  • FIG. 1 compares the conversion of these systems after application on top of an ATR crystal, the IR beam probing the deepest layers, close to the substrate. Initial conversion of the formulation without the succinimide is fast, which is also the cause for solvent entrapment and potential appearance problems.
  • succinimide 5 grams were dissolved in a mixture of 42 grams of butyl acrylate and 42 grams of methanol, and maintained at room temperature as such, or after adding a strong base (9.82 grams of a 1.12 meq/g solution of tetrabutylammonium hydroxide in methanol, 11 meq). Subsequently, the concentration of succinimide is determined as a function of time by taking samples, neutralizing with a known excess of HCl in water, and backtitration with a KOH solution. Without base initiation, no significant loss of succinimide N—H in this solution is observed in two weeks. With the base added, the succinimide concentration can be seen to decrease with time, as illustrated in the table F below. Succinimide concentration is expressed as % relative to the theoretical level based on used amounts.

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US20140235785A1 (en) * 2011-10-07 2014-08-21 Nuplex Resins B.V. Crosslinkable composition crosslinkable by real michael addition (rma) reaction
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