EP1560859A2 - Chemically inert contact adhesive having improved adhesive properties, method for the production thereof - Google Patents

Chemically inert contact adhesive having improved adhesive properties, method for the production thereof

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Publication number
EP1560859A2
EP1560859A2 EP03810955A EP03810955A EP1560859A2 EP 1560859 A2 EP1560859 A2 EP 1560859A2 EP 03810955 A EP03810955 A EP 03810955A EP 03810955 A EP03810955 A EP 03810955A EP 1560859 A2 EP1560859 A2 EP 1560859A2
Authority
EP
European Patent Office
Prior art keywords
meth
acrylate
composition according
polymer composition
acrylates
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Withdrawn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
EP03810955A
Other languages
German (de)
French (fr)
Inventor
Hansjörg Ander
Günter Holl
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.)
Lohmann GmbH and Co KG
Original Assignee
Lohmann GmbH and Co KG
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 Lohmann GmbH and Co KG filed Critical Lohmann GmbH and Co KG
Publication of EP1560859A2 publication Critical patent/EP1560859A2/en
Withdrawn legal-status Critical Current

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    • 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
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
    • C08F290/06—Polymers provided for in subclass C08G
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1803—C3-(meth)acrylate, e.g. (iso)propyl (meth)acrylate
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1806—C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • 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
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
    • 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
    • C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
    • 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
    • C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
    • 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
    • C08F222/00—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 carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/10—Esters
    • C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or 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 of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • 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
    • 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
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic 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
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C

Definitions

  • the present invention relates to pressure sensitive adhesives which are resistant to chemicals and process additives and at the same time have improved adhesion to polar and semipolar substrates, in particular to glass.
  • the invention relates to the production of chemically inert pressure sensitive adhesives and their use, in particular for the production of pressure sensitive adhesive tapes with high initial tack (tack) on polar and semipolar substrates such as glass, metal, polycarbonate and similar materials.
  • the initial adhesion of a PSA tape depends on the substrate to which the PSA tape is applied.
  • substrates with polar surfaces such as glass or metal
  • a value for the initial adhesion of about 25 to 30 N / 25 mm is regarded as high.
  • substrates with non-polar surfaces such as polyethylene or polypropylene
  • values of more than 15 N / 25 mm are already considered high.
  • the currently customary pressure sensitive adhesive tapes based on pure acrylate have an initial adhesion to substrates with non-polar surfaces which is in the range between 5 and 12 N / 25 mm.
  • Pressure sensitive adhesive tapes with a high tack on polar substrates are widely used in industrial processes.
  • the pressure sensitive adhesives used for such adhesive tapes usually consist of polyacrylates or mixtures of polyacrylates with resins (tackifiers).
  • the polyacrylates are obtained by radical polymerization of mixtures of monomeric acrylates, such as, for example, esters of acrylic acid, methyl acrylic acid, ethyl acrylic acid, Butyl acrylic acid and the like, or the acids themselves.
  • the polymerization takes place in solvents by means of thermal activation or in bulk by means of activation by high-energy radiation (UV or EB curing).
  • Acrylic acid is preferably used to achieve a high initial tack.
  • the initial adhesive force comes from the interaction of the strongly polar carboxyl group of acrylic acid with the polar or semi-polar substrates (dipole-dipole interaction, hydrogen bonds).
  • the object of the invention is achieved by pressure-sensitive adhesives based on copolymers of methacrylates and acrylates.
  • the desired high tack of the pressure sensitive adhesives according to the invention is achieved by polar acrylates such as 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, PEG acrylates, 2-aminoethyl acrylate, 3-aminopropyl acrylate, 4-aminobutyl acrylate or the preceding compounds corresponding methacrylates achieved.
  • Polar groups in the acrylates which are capable of hydrogen bonding to the substrates, are important for achieving a high level of tack. These include, in particular, hydroxyl, amino and thio groups and to a lesser extent urea, urethane and imino groups, ie generally acrylates with at least one Zerewitinoff Probe hydrogen.
  • a Zerewitinoff hydrogen is the so-called active hydrogen, which can be determined by a method found by Tschugaeff and Zerewitinoff by reaction with methylmagnesium iodide in butyl or other ethers.
  • the Zerewitinoff Probe hydrogen includes the active hydrogen bound to N, O or S. Carboxy, hydroxy, A ino and I ino as well as thiol groups, but also the active hydrogen of H-acidic hydrocarbons, which can be quantified in individual cases with the methods of Tschugaeff and Zerewitinoff.
  • polar (meth) crylates which have no carboxyl groups but are selected from the group of the hydroxy (meth) acrylates.
  • non-polar acrylates and / or methacrylates are, for example, esterification products made from acrylic acid and monohydric alcohols, and the corresponding products such as those formed when using methacrylic acid.
  • the products of the alcohols C 4-C1.5_ are preferred and the reaction products of the alcohols C 6 -C 10 are particularly preferred.
  • a crosslinker can be added to the acrylate and / or methacrylate mixtures during the polymerization.
  • the crosslinking agents are, on the one hand, acrylates or methacrylates of the di-, tri-and higher-valent alcohols or analog vinyl ethers (hereinafter also referred to as di-, tri-functional and higher (meth) acrylates) or mixtures thereof.
  • the polymers can also be crosslinked after the polymerization, including the polar acrylates, using isocyanates, epoxides, aziridines, metal complexes or other multifunctional compounds or mixtures thereof which react with Zerewitinoff hydrogen. Mixtures of (meth) acrylate-containing crosslinking agents with compounds reactive towards H-acidic compounds are of course also possible.
  • the degree and type of crosslinking in the production of the polymer composition according to the invention depends on the softness and internal strength of the adhesive polymers required for later use, as well as further characteristic values such as heat and cold resistance, tack and the like.
  • the adhesives according to the invention can be produced from:
  • the polar (meth) crylates with Zerewitinoff hydrogen according to a) are reaction products of acrylic or methacrylic acid with two-, three- or higher-functional alcohols and theirs
  • the apolar (meth) crylates according to b) are reaction products of onofunctional alcohols or amines with acrylic acid or methacrylic acid and mixtures thereof.
  • Technically important representatives of this class are methyl (meth) acrylate, ethyl acrylate, butyl acrylate, hexyl (meth) acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isodecyl (meth) acrylate, isobornyl (meth) acrylate, alkyl (meth) aerylamides.
  • monomers that are accessible to radical polymerization such as vinyl compounds, are added to the (meth) acrylate mixtures according to the invention in minor amounts, should special requirements for the adhesive polymer make this necessary.
  • (Meth) acrylate according to c) is understood to mean compounds which are formed by the reaction of polyhydric alcohols
  • the class of "higher-quality (meth) acrylate-containing compounds" in the sense of the previous definition of c) further includes the compounds from the series of (meth) acrylated polyesters and (meth) acrylated polyurethanes.
  • the (meth) acrylated polyesters are are the reaction products of OH-terminated polyester polyols, mostly of oligomeric origin, with (meth) acrylic acid or the products from the reaction of carboxyl-containing polyester polyols, also mostly in oligomeric form, with OH-group-containing (meth) acrylates
  • Polyurethanes are reaction products of amine- or hydroxyl-terminated (meth) crylates with di-, tri- or polyisocyanates (for example 1,6-hexamethylene diisocyanate, 2,4- or 2,6-tolylene diisocyanate, isophorone diisocyanate), their urea , Derivatives containing biuret or alophanate or the di- and tri
  • a compound according to c) which is reactive toward Zerewitinoffs hydrogen is understood to mean epoxides, isoeyanates, cyanates, aziridines, metal chelates or others state-of-the-art compounds which are able to form a chemical bond with CH acidic compounds.
  • An initiator according to d) is understood to mean compounds which, when exposed to thermal energy or high-energy radiation, are able to decompose into radicals and to initiate radical polymerization.
  • examples of such initiators are azo compounds, peroxide compounds, aromatic ⁇ -hydroxyketones, arylphosphorus compounds, and similar radical initiators.
  • a liquid, chemically inert medium according to e) means a liquid compound which is able to dissolve, emulsify or disperse the polymer formed.
  • These include compounds such as esters, ketones, alcohols, hydrocarbons, cycloaliphatics, aromatics, water or mixtures of these compounds.
  • the polymer compositions according to the invention can be prepared not only in organic solvents (solution polymerization) but also in water (emulsion polymerization), but also without solvents by means of UV light or electron beams.
  • the polymers according to the invention are produced and processed in a known manner.
  • the polymer is known in a liquid, chemically inert medium (component according to e)) from (meth) acrylates with Zerewitinoff hydrogen, apolar (meth) acrylates and an initiator (the components according to a), b ), d)) produced (solution polymerization).
  • This solution comes with a compound active against Zerewitinoff Hair hydrogen reacted according to c).
  • the solution can then be processed in a coating system with a downstream drying tunnel according to the prior art to form a tape-like adhesive or sealant.
  • (meth) acrylates with Zerewitinoff's hydrogen, apolar (meth) crylates and an initiator are emulsified in water.
  • additional dispersants or emulsifiers known to the person skilled in the art may be indicated here.
  • the reaction mixture is converted in a known manner to a polymer dispersion or emulsion with a solids content of between 10 and 70% by weight. This can then be processed into tape-like sealants and adhesives analogously to the solvent-based polymers.
  • a polymer syrup is produced from components a) to c) in a known manner.
  • component c) preference is given to using bifunctional, trifunctional or higher functional (meth) acrylates.
  • the polymer syrup can then be processed on a coating machine with a subsequent curing device using high-energy radiation to form tape-like adhesives and sealants.
  • the polymer composition according to the invention can be used as an adhesive or sealant.
  • the polymer composition according to the invention is preferably further processed to PSA tapes.
  • An initial adhesion of up to 50 N / 25 mm on substrates with a polar surface and up to 20 N / 25 mm on substrates with a non-polar surface was measured with the PSA tapes produced with the aid of the polymers according to the invention. Examples
  • the solution is spread out to a film 0.2 mm thick. After the solvent has been flashed off, the film is dried at 90 ° C. for 10 minutes. A pressure-sensitive adhesive film is obtained.
  • Ethylhexyl acrylate, 50 parts by weight of 2-hydroxyethyl acrylate and 50 parts by weight of acrylic acid are mixed in 450
  • the solids content of the adhesive solution is 50% by weight, the residual monomer content a maximum of 2.5% by weight. After drying, a pressure-sensitive film is obtained.
  • the adhesive films were applied to an aluminum sheet and covered with isocyanate (HDI) at the edges so that the isocyanate was in contact with both the adhesive and the aluminum substrate.
  • HDI isocyanate
  • the adhesives according to the invention are notable for high resistance to reactive substances. At the same time, the adhesion to polar substrates compared to conventional (acrylic acid-containing) adhesives is not adversely affected.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Adhesive Tapes (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention relates to chemically inert contact adhesives having improved adhesive properties on polar and semipolar substrates, and the production and use thereof, especially for producing contact-adhesive bands that are provided with great tack on polar and semipolar substrates.

Description

Chemisch inerter Haftkleber mit verbesserter Haftung, Verfahren zu seiner Herstellung und VerwendungChemically inert pressure sensitive adhesive with improved adhesion, process for its production and use
Die vorliegende Erfindung betrifft Haftklebstoffe, die beständig gegenüber Chemikalien und Prozessadditiven sind sowie gleichzeitig eine verbesserte Haftung auf polaren und semipolaren Substraten, insbesondere auf Glas, aufweisen. Insbesondere betrifft die Erfindung die Herstellung von chemisch inerten Haftklebstoffen und deren Verwendung, insbesondere zur Herstellung von Haftklebebändern mit hoher Anfangshaftung (Tack) auf polaren und semipolaren Substraten wie Glas, Metall, Polycarbonat und ähnlichen Werkstoffen.The present invention relates to pressure sensitive adhesives which are resistant to chemicals and process additives and at the same time have improved adhesion to polar and semipolar substrates, in particular to glass. In particular, the invention relates to the production of chemically inert pressure sensitive adhesives and their use, in particular for the production of pressure sensitive adhesive tapes with high initial tack (tack) on polar and semipolar substrates such as glass, metal, polycarbonate and similar materials.
Die Anfangshaftung eines Haftklebebandes ist vom Substrat abhängig, auf das das Haftklebeband appliziert wird. Für Substrate mit polaren Oberflächen, wie Glas oder Metall, wird ein Wert für die Anfangshaftung von etwa 25 bis 30 N/25 mm, wie er mit den zurzeit üblichen Haftklebebändern auf Reinacrylatbasis erreicht werden kann, als hoch angesehen. Bei Substraten mit nicht polaren Oberflächen, wie Polyethylen oder Polypropylen, werden bereits Werte von mehr als 15 N/25 mm als hoch angesehen. Die zurzeit üblichen Haftklebebänder auf Reinacrylatbasis weisen eine Anfangshaftung auf Substraten mit nicht polaren Oberflächen auf, die im Bereich zwischen 5 und 12 N /25 mm liegt.The initial adhesion of a PSA tape depends on the substrate to which the PSA tape is applied. For substrates with polar surfaces, such as glass or metal, a value for the initial adhesion of about 25 to 30 N / 25 mm, as can be achieved with the currently customary pressure-sensitive adhesive tapes based on pure acrylate, is regarded as high. For substrates with non-polar surfaces, such as polyethylene or polypropylene, values of more than 15 N / 25 mm are already considered high. The currently customary pressure sensitive adhesive tapes based on pure acrylate have an initial adhesion to substrates with non-polar surfaces which is in the range between 5 and 12 N / 25 mm.
Haftklebebänder mit einem hohen Tack auf polaren Substraten finden in industriellen Prozessen breite Anwendung. Die für derartige Haf klebebänder verwendeten Haftklebstoffe bestehen üblicherweise aus Polyacrylaten oder Mischungen von Polyacrylaten mit Harzen (Tackifier) . Die Polyacrylate werden durch radikalisehe Polymerisation von Mischungen monomerer Acrylate, wie beispielsweise Estern von Acrylsäure, Methylacrylsäure, Ethylacrylsäure, Butylacrylsäure und dergleichen, oder den Säuren selbst hergestellt. Die Polymerisation erfolgt in Lösungsmitteln mittels thermischer Aktivierung oder in Substanz mittels Aktivierung durch energiereiche Strahlung (UV- oder EB- Härtung) .Pressure sensitive adhesive tapes with a high tack on polar substrates are widely used in industrial processes. The pressure sensitive adhesives used for such adhesive tapes usually consist of polyacrylates or mixtures of polyacrylates with resins (tackifiers). The polyacrylates are obtained by radical polymerization of mixtures of monomeric acrylates, such as, for example, esters of acrylic acid, methyl acrylic acid, ethyl acrylic acid, Butyl acrylic acid and the like, or the acids themselves. The polymerization takes place in solvents by means of thermal activation or in bulk by means of activation by high-energy radiation (UV or EB curing).
Zum Erreichen einer hohen Anfangsklebkraft (Tack) wird vorzugsweise Acrylsäure verwende . Die hoheAcrylic acid is preferably used to achieve a high initial tack. The height
Anfangsklebkraft kommt hierbei durch die Wechselwirkung der stark polaren Carboxylgruppe der Acrylsäure mit den polaren oder semipolaren Substraten (Dipol-Dipol-Wechselwirkung, Wasserstoffbrückenbindungen) zustande.The initial adhesive force comes from the interaction of the strongly polar carboxyl group of acrylic acid with the polar or semi-polar substrates (dipole-dipole interaction, hydrogen bonds).
Der Einsatz von Acrylsäure zum Erreichen einer hohen Anfangshaftung auf polaren Oberflächen ist jedoch mit gravierenden Nachteilen verbunden. Auf Grund des stark polaren Charakters der Acrylsäure zeigen diese Klebstoffe eine hohe Affinität zu polaren und semipolaren Lösemitteln. Eine Dauerexposition dieser Klebstoffe gegenüber polaren oder semipolaren Lösemitteln führt in der Regel zu einem Versagen der Klebeverbindung auf Grund von Quellung (kohäsives Versagen) oder Ablösung des Klebstoffs von der Oberfläche eines Substrats in Folge einer Migration des Lösemittels in die Grenzschicht zwischen Klebstoff und Substratoberfläche (adhäsives Versagen) .However, the use of acrylic acid to achieve a high initial adhesion on polar surfaces is associated with serious disadvantages. Due to the strongly polar nature of acrylic acid, these adhesives show a high affinity for polar and semi-polar solvents. Long-term exposure of these adhesives to polar or semi-polar solvents generally leads to failure of the adhesive bond due to swelling (cohesive failure) or detachment of the adhesive from the surface of a substrate as a result of migration of the solvent into the interface between the adhesive and the substrate surface (adhesive To fail) .
Ein weiterer Nachteil von Acrylsäure enthaltenden Haftklebstoffen ist die hohe Reaktivität der Acrylsäure gegenüber reaktiven chemischen Verbindungen. Insbesondere bei der Herstellung von Verbundglas und Verbundglasprodukten, bei denen Gießharze auf Basis isocyanathaltiger Polymere zum Einsatz kommen, kommt es zu einer Reaktion der Isocyanatgruppen mit der Acrylsäure im Haftklebstoff. Diese Reaktion äußert sich in einer unerwünschten Blasenbildung durch entstehendes Kohlendioxid aufgrund der folgenden Reaktion: Rj- CO + R3-COOH —* Rj-NH- CO-R2 + C02. Diese Blasenbildung kann nicht nur die Funktionalität der Bauteile beeinträchtigen, sondern ist vor allem bei Verklebungen an sichtbaren Stellen aus ästhetischen Gründen unerwünscht.Another disadvantage of pressure sensitive adhesives containing acrylic acid is the high reactivity of acrylic acid towards reactive chemical compounds. In particular in the production of laminated glass and laminated glass products, in which casting resins based on polymers containing isocyanate are used, there is a reaction of the isocyanate groups with the acrylic acid in the pressure-sensitive adhesive. This reaction manifests itself in an undesirable blistering due to carbon dioxide due to the following reaction: R j - CO + R 3 -COOH - * R j -NH- CO-R 2 + C0 2 . This blistering can not only impair the functionality of the components, but is particularly undesirable for aesthetic reasons when bonding in visible places.
Es war daher Aufgabe der vorliegenden Erfindung, einen Haftklebstoff bereitzustellen, der eine hohe Anfangshaftung zeigt und dabei gleichzeitig inert gegenüber Chemikalieneinflüssen und Feuchtigkeit ist. Gleichzeitig sollte der Klebstoff bei Kontakt mit isocyanathaltigen Verbindungen keine sichtbare Reaktion zeigen.It was therefore an object of the present invention to provide a pressure-sensitive adhesive which exhibits high initial adhesion and is at the same time inert to the effects of chemicals and moisture. At the same time, the adhesive should show no visible reaction when it comes into contact with isocyanate-containing compounds.
Die erfindungsgemäße Aufgabe wird durch Haftklebstoffe auf Basis von Copoly erisaten aus Methacrylaten und Acrylaten gelöst . Der gewünschte hohe Tack der erfindungsgemäßen Haftklebstoffe wird durch polare Acrylate wie 2-Hydroxy- ethylacrylat, 3-Hydroxypropylacrylat, 4-Hydroxybutyl- acrylat, PEG-Acrylate, 2-Aminoethylacrylat, 3-Aminopropyl- acrylat, 4-Aminobutylacrylat oder der den vorangegangenen Verbindungen entsprechenden Methacrylate erreicht. Wichtig für das Erreichen eines hohen Täcks sind polare Gruppen in den Acrylaten, die befähigt sind, Wasserstoffbrückenbindungen zu den Substraten aufzubauen. Hierzu zählen insbesondere Hydroxy-, A ino- und Thiogruppen sowie in untergeordnetem Maße Harnstoff-, Urethan- und Iminogruppen, also generell Acrylate mit mindestens einem Zerewitinoffsehen Wasserstoff.The object of the invention is achieved by pressure-sensitive adhesives based on copolymers of methacrylates and acrylates. The desired high tack of the pressure sensitive adhesives according to the invention is achieved by polar acrylates such as 2-hydroxyethyl acrylate, 3-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, PEG acrylates, 2-aminoethyl acrylate, 3-aminopropyl acrylate, 4-aminobutyl acrylate or the preceding compounds corresponding methacrylates achieved. Polar groups in the acrylates, which are capable of hydrogen bonding to the substrates, are important for achieving a high level of tack. These include, in particular, hydroxyl, amino and thio groups and to a lesser extent urea, urethane and imino groups, ie generally acrylates with at least one Zerewitinoffsehen hydrogen.
Unter einem Zerewitinoffsehen Wasserstoff versteht man den so genannten aktiven Wasserstoff, der sich nach einem von Tschugaeff und Zerewitinoff gefundenen Verfahren durch Umsetzung mit Methylmagnesiumiodid in Butyl- oder anderen Ethern bestimmen lässt. Zum Zerewitinoffsehen Wasserstoff gehört der an N, O oder S gebundenen aktive Wasserstoff von Carboxy-, Hydroxy-, A ino- und I ino- sowie Thiolgruppen, aber auch der aktive Wasserstoff von H-aciden Kohlenwasserstoffen, der sich in Einzelfällen mit den Verfahren von Tschugaeff und Zerewitinoff quantitativ erfassen lässt.A Zerewitinoff hydrogen is the so-called active hydrogen, which can be determined by a method found by Tschugaeff and Zerewitinoff by reaction with methylmagnesium iodide in butyl or other ethers. The Zerewitinoffsehen hydrogen includes the active hydrogen bound to N, O or S. Carboxy, hydroxy, A ino and I ino as well as thiol groups, but also the active hydrogen of H-acidic hydrocarbons, which can be quantified in individual cases with the methods of Tschugaeff and Zerewitinoff.
Erfindungsgemäß werden polare (Meth) crylate bevorzugt, die keine Carboxylgruppen aufweisen, sondern aus der Gruppe der Hydroxy(meth) acrylate ausgewählt sind.According to the invention, preference is given to polar (meth) crylates which have no carboxyl groups but are selected from the group of the hydroxy (meth) acrylates.
Die notwendige Konsistenz der Haftklebstoffe hinsichtlich Weichheit und Verarbeitbarkeit wird erfindungsgemäß durch die Verwendung unpolarer Acrylate und/oder Methacrylate erreicht. Geeignet hierfür sind z.B. Veresterungsprodukte aus Acrylsäure und einwertigen Alkoholen, sowie den entsprechenden Produkten, wie sie bei der Verwendung von Methacrylsäure entstehen. Bevorzugt gemäß der Erfindung sind hierbei die Produkte der Alkohole C 4-C1,5_ und besonders bevorzugt die Umsetzungsprodukte der Alkohole C6-C10.The necessary consistency of the pressure-sensitive adhesives with regard to softness and processability is achieved according to the invention by using non-polar acrylates and / or methacrylates. Suitable for this are, for example, esterification products made from acrylic acid and monohydric alcohols, and the corresponding products such as those formed when using methacrylic acid. According to the invention, the products of the alcohols C 4-C1.5_ are preferred and the reaction products of the alcohols C 6 -C 10 are particularly preferred.
Zur Erreichung einer inneren Festigkeit der Haftklebstoffe (Kohäsion) kann den Acrylat- und/oder Methacrylatmischungen während der Polymerisation ein Vernetzer zugesetzt werden. Bei den Vernetzern handelt es sich zum einen um Acrylate oder Methacrylate der zwei-, drei- und höherwer igen Alkohole oder analoge Vinylether (im Weiteren auch als zwei-, drei- und höherfunktionelle (Meth)Acrylate bezeichnet) oder Mischungen hiervon. Zum anderen können die Polymere auch nach der Polymerisation unter Einbeziehung der polaren Acrylate mittels Isocyanaten, Epoxiden, Aziridinen, Metallkomplexen oder sonstigen mit Zerewitinoffschem Wasserstoff reagierenden multifunktionellen Verbindungen oder deren Mischungen vernetzt werden. Selbstverständlich sind auch Mischungen von (meth) acrylat- haltigen Vernetzern mit gegenüber H-aciden Verbindungen reaktiven Verbindungen möglich.To achieve an internal strength of the pressure-sensitive adhesives (cohesion), a crosslinker can be added to the acrylate and / or methacrylate mixtures during the polymerization. The crosslinking agents are, on the one hand, acrylates or methacrylates of the di-, tri-and higher-valent alcohols or analog vinyl ethers (hereinafter also referred to as di-, tri-functional and higher (meth) acrylates) or mixtures thereof. On the other hand, the polymers can also be crosslinked after the polymerization, including the polar acrylates, using isocyanates, epoxides, aziridines, metal complexes or other multifunctional compounds or mixtures thereof which react with Zerewitinoff hydrogen. Mixtures of (meth) acrylate-containing crosslinking agents with compounds reactive towards H-acidic compounds are of course also possible.
Der Grad und die Art der Vernetzung bei der Herstellung der erfindungsgemäßen PolymerZusammensetzung richtet sich nach der für die spätere Anwendung notwendigen Weichheit und inneren Festigkeit der Klebstoffpolymere sowie weiteren Kennwerten wie Wärme- und Kältebeständigkeit, Tack und dergleichen.The degree and type of crosslinking in the production of the polymer composition according to the invention depends on the softness and internal strength of the adhesive polymers required for later use, as well as further characteristic values such as heat and cold resistance, tack and the like.
Die erfindungsgemäßen Klebstoffe lassen sich herstellen aus:The adhesives according to the invention can be produced from:
a) 1 bis 50 Gew.-% polaren (Meth)Acrylaten mit Zerewitinoffschem Wasserstoff, b) 50 bis 99 Gew.-% apolaren (Meth) crylaten, c) bis zu 10 Gew.-% eines zwei-, drei- oder höherfunktionellen (Meth)acrylats oder einer gegenüber Zerewitonoffsehen Wasserstoffen reaktivena) 1 to 50% by weight of polar (meth) acrylates with Zerewitinoff hydrogen, b) 50 to 99% by weight of apolar (meth) crylates, c) up to 10% by weight of a two-, three- or higher functional (Meth) acrylate or a hydrogen reactive towards Zerewitonoffsehen
(poly) funktioneilen Verbindung, wobei sich die Gew.-% unter a) bis c) zu 100 Gevr. -% addieren, d) 0,05 bis 5 Gew.-% eines Initiators, bezogen auf die Summe der Komponenten aus a) bis c), wobei sich die Gew.-% unter a) bis d) zu 100 Gew.-% addieren, und e) bis zu 90 Gew.-% eines flüssigen, chemisch inerten Mediums, bezogen auf die Komponenten a) bis d) .(poly) functional compound, the weight% under a) to c) being 100%. add%, d) 0.05 to 5% by weight of an initiator, based on the sum of the components from a) to c), the% by weight under a) to d) being 100% by weight add, and e) up to 90 wt .-% of a liquid, chemically inert medium, based on components a) to d).
Unter den polaren (Meth) crylaten mit Zerewitinoffschem Wasserstoff gemäß a) versteht man Umsetzungsprodukte der Acryl- oder Methacrylsäure mit zwei-, drei- oder höherfunktionellen Alkoholen, sowie derenThe polar (meth) crylates with Zerewitinoff hydrogen according to a) are reaction products of acrylic or methacrylic acid with two-, three- or higher-functional alcohols and theirs
Ethoxylierungsprodukte mit endständigen Hydroxy-, A ino-, Thio-, oder heterocyclischen Gruppen mit mindestens einem aktiven Wasserstoff. Selbstverständlich können im Sinne der Erfindung auch Mischungen dieser Verbindungen eingesetzt werden. In Tabelle 1 sind exemplarisch technisch wichtige Verbindungen aufgeführt .Ethoxylation products with terminal hydroxyl, amino, thio, or heterocyclic groups with at least one active hydrogen. Mixtures of these compounds can of course also be used for the purposes of the invention become. Examples of technically important compounds are listed in Table 1.
Tabelle 1: Beispiele technisch relevanter (Meth)Acrylate mit aktivem WasserstoffTable 1: Examples of technically relevant (meth) acrylates with active hydrogen
Unter den apolaren (Meth) crylaten gemäß b) versteht man Umse zungsprodukte von onofunktionellen Alkoholen oder Aminen mit Acrylsäure oder Methacryläure sowie Mischungen davon. Technisch wichtige Vertreter dieser Klasse sind Methyl (meth) acrylat, Ethylacrylat, Butylacrylat, Hexyl(meth)acrylat, Isooctylacrylat, 2-Ethylhexylacrylat, Isodecyl (meth) acrylat, Isobornyl (meth) acrylat, Alkyl- (meth) aerylamide. Es können auch noch andere Monomere, die der radikalischen Polymerisation zugänglich sind, wie z.B. Vinylverbindungen, in untergeordneten Mengen den erfindungsgemäßen (Meth)Acrylatmischungen zugegeben werden, sollten spezielle Anforderungen an das Klebstoffpolymer dies notwendig machen.The apolar (meth) crylates according to b) are reaction products of onofunctional alcohols or amines with acrylic acid or methacrylic acid and mixtures thereof. Technically important representatives of this class are methyl (meth) acrylate, ethyl acrylate, butyl acrylate, hexyl (meth) acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isodecyl (meth) acrylate, isobornyl (meth) acrylate, alkyl (meth) aerylamides. There can also be other monomers that are accessible to radical polymerization, such as vinyl compounds, are added to the (meth) acrylate mixtures according to the invention in minor amounts, should special requirements for the adhesive polymer make this necessary.
Unter einem zwei-, drei- oder höherfunktionellenUnder a two, three or higher functional
(Meth) Acrylat gemäß c) versteht man Verbindungen, die durch die Umsetzung von mehrwertigen Alkoholen mit(Meth) acrylate according to c) is understood to mean compounds which are formed by the reaction of polyhydric alcohols
(Meth) crylsäure erhalten werden. Einige technisch wichtige(Meth) acrylic acid can be obtained. Some technically important ones
Verbindungen dieser Klasse sind in Tabelle 2 aufgeführt.Compounds of this class are listed in Table 2.
Tabelle 2 : Beispiele technisch relevanter höherwertiger (meth) acrylathaltiger VerbindungenTable 2: Examples of technically relevant higher-quality (meth) acrylate-containing compounds
Zu der Klasse der „höherwertigen (meth)acrylathaltigen Verbindungen" im Sinne der vorausgegangenen Definition von c) zählen weiterhin die Verbindungen aus der Reihe der (meth) acrylierten Polyester sowie der (meth) acrylierten Polyurethane. Bei den (meth) acrylierten Polyestern handelt es sich um die Umsetzungsprodukte von OH-terminierten Polyesterpolyolen, zumeist oligomeren Ursprungs, mit (Meth)Acrylsäure oder den Produkten aus der Reaktion von carboxylgruppenhaltigen Polyesterpolyolen, ebenfalls zumeist in oligomerer Form, mit OH-gruppenhaltigen (Meth)Acrylaten. Bei den (meth) acrylierten Polyurethanen handelt es sich um Umsetzungsprodukte von amin- oder hydroxylterminierten (Meth) crylaten mit Di-, Tri- oder Polyisocyanaten (beispielsweise 1, 6-Hexamethylen- diisocyanat, 2,4- oder 2, 6-Toluylendiisocyanat, Isophorondiisocyant) , deren Harnstoff-, Biuret- oder alophanathaltigen Derivate oder der den monomeren Verbindungen entstammenden di- und trimeren Verbindungen.The class of "higher-quality (meth) acrylate-containing compounds" in the sense of the previous definition of c) further includes the compounds from the series of (meth) acrylated polyesters and (meth) acrylated polyurethanes. The (meth) acrylated polyesters are are the reaction products of OH-terminated polyester polyols, mostly of oligomeric origin, with (meth) acrylic acid or the products from the reaction of carboxyl-containing polyester polyols, also mostly in oligomeric form, with OH-group-containing (meth) acrylates Polyurethanes are reaction products of amine- or hydroxyl-terminated (meth) crylates with di-, tri- or polyisocyanates (for example 1,6-hexamethylene diisocyanate, 2,4- or 2,6-tolylene diisocyanate, isophorone diisocyanate), their urea , Derivatives containing biuret or alophanate or the di- and trimeric compounds derived from the monomeric compounds.
Unter einer gegenüber Zerewitinoffsehen Wasserstoffen reaktiven Verbindung gemäß c) versteht man Epoxide, Isoeyanate, Cyanate, Aziridine, Metallchelate oder sonstige dem Stand der Technik entsprechende Verbindungen, die in der Lage sind, mit C-H aeiden Verbindungen eine chemischen Bindung einzugehen.A compound according to c) which is reactive toward Zerewitinoffs hydrogen is understood to mean epoxides, isoeyanates, cyanates, aziridines, metal chelates or others state-of-the-art compounds which are able to form a chemical bond with CH acidic compounds.
Unter einem Initiator gemäß d) versteht man Verbindungen, die bei Einwirkung thermischer Energie oder energiereicher Strahlung in der Lage sind, in Radikale zu zerfallen und eine radikalische Polymerisation zu starten. Beispiele für derartige Initiatoren sind Azoverbindungen, Peroxid- verbindungen, aromatische α-Hydroxyketone, Arylphosphor- verbindungen, und ähnliche Radikalstarter.An initiator according to d) is understood to mean compounds which, when exposed to thermal energy or high-energy radiation, are able to decompose into radicals and to initiate radical polymerization. Examples of such initiators are azo compounds, peroxide compounds, aromatic α-hydroxyketones, arylphosphorus compounds, and similar radical initiators.
Unter einem flüssigen, chemisch inerten Medium gemäß e) versteht man eine flüssige Verbindung, die in der Lage ist, das gebildete Polymer zu lösen, zu emulgieren, oder zu dispergieren. Hierzu zählen Verbindungen wie Ester, Ketone, Alkohole, Kohlenwasserstoffe, Cycloaliphaten, Aromaten, Wasser oder Mischungen aus diesen Verbindungen.A liquid, chemically inert medium according to e) means a liquid compound which is able to dissolve, emulsify or disperse the polymer formed. These include compounds such as esters, ketones, alcohols, hydrocarbons, cycloaliphatics, aromatics, water or mixtures of these compounds.
Die Herstellung der erfindungsgemäßen Polymerzusammensetzungen kann sowohl in organischen Lösemitteln (Lösungspolymerisation) als auch in Wasser (Emulsionspolymerisation) , aber auch lösemittelfrei mittels UV-Licht oder Elektronenstrahl erfolgen. Dabei erfolgt die Herstellung und Verarbeitung der erfindungsgemäßen Polymere in bekannter Art und Weise.The polymer compositions according to the invention can be prepared not only in organic solvents (solution polymerization) but also in water (emulsion polymerization), but also without solvents by means of UV light or electron beams. The polymers according to the invention are produced and processed in a known manner.
Bei dem lösemittelhaltigen Verfahren wird das Polymer nach bekannter Art und Weise in einem flüssigen, chemisch inerten Medium (Komponente gemäß e) ) aus (Meth)Acrylaten mit Zerewitinoffschem Wasserstoff, apolaren (Meth)Acrylaten und einem Initiator (den Komponenten gemäß a) , b) , d) ) hergestellt (Lösungspolymerisation) . Dabei erhält man Lösungen von Klebstoffpolymeren mit einem typischen Feststoffgehalt von 10 - 70 GΘW.-%. Diese Lösung wird mit einer gegenüber Zerewitinoffsehen Wasserstoffen aktiven Verbindung gemäß c) umgesetzt. Anschließend kann die Lösung auf einer Beschichtungsanlage mit nachgeschaltetem Trockenkanal gemäß dem Stand der Technik zu einem bandförmigen Kleb- oder DichtStoff verarbeitet werden.In the solvent-containing process, the polymer is known in a liquid, chemically inert medium (component according to e)) from (meth) acrylates with Zerewitinoff hydrogen, apolar (meth) acrylates and an initiator (the components according to a), b ), d)) produced (solution polymerization). This gives solutions of adhesive polymers with a typical solids content of 10 - 70% by weight. This solution comes with a compound active against Zerewitinoffsehen hydrogen reacted according to c). The solution can then be processed in a coating system with a downstream drying tunnel according to the prior art to form a tape-like adhesive or sealant.
Bei den wasserbasierten Verfahren werden (Meth)Acrylate mit Zerewitinoffschem Wasserstoff, apolare (Meth) crylate und ein Initiator (die Komponenten gemäß a) bis c) ) in Wasser emulgiert. Hierbei kann die Verwendung zusätzlicher, dem Fachmann bekannter Dispergatoren oder Emulgatoren angezeigt sein. Die Reaktionsmischung wird nach bekannter Art und Weise zu einer Polymerdispersion oder Emulsion mit einem Feststoffgehalt zwischen 10 und 70 Gew.% umgesetzt. Diese kann dann analog den lösemittelbasierten Polymeren zu bandförmigen Dicht- und Klebstoffen verarbeitet werden.In the water-based processes, (meth) acrylates with Zerewitinoff's hydrogen, apolar (meth) crylates and an initiator (the components according to a) to c)) are emulsified in water. The use of additional dispersants or emulsifiers known to the person skilled in the art may be indicated here. The reaction mixture is converted in a known manner to a polymer dispersion or emulsion with a solids content of between 10 and 70% by weight. This can then be processed into tape-like sealants and adhesives analogously to the solvent-based polymers.
Bei dem lösemittelfreien Verfahren wird aus den Komponenten a) bis c) nach bekannter Art und Weise ein Polymersirup hergestellt. Als Komponente c) kommen hierbei bevorzugt zwei-, drei- oder höherfunktionelle (Meth) acrylate zum Einsatz. Der Polymersirup kann anschließend auf einer Beschichtungsmaschine mit nachgeschalteter Härtungseinrichtung mittels energiereicher Strahlung zu bandförmigen Kleb- und DichtStoffen verarbeitet werden.In the solvent-free process, a polymer syrup is produced from components a) to c) in a known manner. As component c), preference is given to using bifunctional, trifunctional or higher functional (meth) acrylates. The polymer syrup can then be processed on a coating machine with a subsequent curing device using high-energy radiation to form tape-like adhesives and sealants.
Die erfindungsgemäße Polymerzusammensetzung kann als Kleboder Dichtstoff verwendet werden. Vorzugsweise wird die erfindungsgemäße PolymerZusammensetzung zu Haftklebebändern weiter verarbeitet. Mit den mit Hilfe der erfindungsgemäßen Polymere hergestellten Haftklebebändern wurde eine Anfangshaftung von bis zu 50 N/25 mm auf Substraten mit polarer Oberfläche und von bis zu 20 N/25 mm auf Substraten mit nicht polarer Oberfläche gemessen. BeispieleThe polymer composition according to the invention can be used as an adhesive or sealant. The polymer composition according to the invention is preferably further processed to PSA tapes. An initial adhesion of up to 50 N / 25 mm on substrates with a polar surface and up to 20 N / 25 mm on substrates with a non-polar surface was measured with the PSA tapes produced with the aid of the polymers according to the invention. Examples
1. Herstellung eines lösemittelbasierten, chemisch inerten Klebstoffes1. Production of a solvent-based, chemically inert adhesive
250 Gewichtsteile Isodecylmethacrylat und 250 Gewichtsteile 2-Hydroxyethylacrylat werden in 450 Gewichtsteilen Ethylacetat gelöst und unter Stickstoffeinleitung und Rühren zum Sieden erhitzt. Anschließend dosiert man 5 Gewichtsteile Azoisobutyronitril, gelöst in 50 Gewichtsteilen Ethylacetat, über 1 Stunde hinzu. Nach Beendigung der Initiatorzugabe belässt man die Reaktionsmischung für 5 Stunden unter Rückfluss. Nach Abkühlung erhält man eine Klebstofflösung mit einem Feststoffgehalt von 50 Gew.%. Der Restmonomergehalt beträgt maximal 2,5 Gew .250 parts by weight of isodecyl methacrylate and 250 parts by weight of 2-hydroxyethyl acrylate are dissolved in 450 parts by weight of ethyl acetate and heated to the boil while introducing nitrogen and stirring. Then 5 parts by weight of azoisobutyronitrile, dissolved in 50 parts by weight of ethyl acetate, are added over 1 hour. After the initiator addition has ended, the reaction mixture is left under reflux for 5 hours. After cooling, an adhesive solution with a solids content of 50% by weight is obtained. The residual monomer content is a maximum of 2.5% by weight.
Die Klebstofflösung wird mit 10 Gewichtsteilen einer 10 Gew. %-igen Lösung eines Titanchelats in Isopropanol versetzt.10 parts by weight of a 10% by weight solution of a titanium chelate in isopropanol are added to the adhesive solution.
Die Lösung wird zu einem Film von 0,2 mm Dicke ausgestrichen. Nach dem Ablüften des Lösemittels wird der Film bei 90°C über 10 min getrocknet. Man erhält einen haftklebenden Film.The solution is spread out to a film 0.2 mm thick. After the solvent has been flashed off, the film is dried at 90 ° C. for 10 minutes. A pressure-sensitive adhesive film is obtained.
2. Herstellung eines lösemittelfreien, chemisch inerten Klebstoffs2. Production of a solvent-free, chemically inert adhesive
250 Gewichtsteile Isodecylmethacrylat und 250 Gewichtsteile 2-Hydroxyethylacrylat werden mit 5 Gewichtsteilen Irgacure 819 (C BA Spezialitätenchemie) und 2,5 Gewichtsteilen Tripropylenglykoldiacrylat vermischt . Nach Aufräkeln einer 0,5 mm dicken Schicht auf eine Trägerfolie (PET) wird diese mittels einer UV-Lampe (80 W/cm) in Stickstoffatmosphäre innerhalb 1 min gehärtet. Man erhält einen haftklebenden Film. Der Umsatz beträgt mindestens 98 %.250 parts by weight of isodecyl methacrylate and 250 parts by weight of 2-hydroxyethyl acrylate are mixed with 5 parts by weight of Irgacure 819 (C BA specialty chemicals) and 2.5 parts by weight of tripropylene glycol diacrylate. After a 0.5 mm thick layer has been applied onto a carrier film (PET), it is cured within 1 min using a UV lamp (80 W / cm) in a nitrogen atmosphere. A pressure-sensitive adhesive film is obtained. The turnover is at least 98%.
3. Herstellung eines lösemittelbasierten Klebstoffs3. Production of a solvent-based adhesive
250 Gewichtsteile Isodecylmethacrylat, 150 Gewichtsteile 2-250 parts by weight of isodecyl methacrylate, 150 parts by weight of 2-
Ethylhexylacrylat, 50 Gewichtsteile 2-Hydroxyethylacrylat und 50 Gewichtsteile Acrylsäure werden in 450Ethylhexyl acrylate, 50 parts by weight of 2-hydroxyethyl acrylate and 50 parts by weight of acrylic acid are mixed in 450
Gewichtsteilen Ethylacetat gelöst.Parts by weight of ethyl acetate dissolved.
Die Polymerisation und Verarbeitung erfolgt analog BeispielThe polymerization and processing are carried out analogously to the example
1.1.
Der Feststoffgehalt der Klebstofflösung beträgt 50 Gew.%, der Restmonomergehalt maximal 2,5 Gew.%. Nach dem Trocknen erhält man einen haftklebenden Film.The solids content of the adhesive solution is 50% by weight, the residual monomer content a maximum of 2.5% by weight. After drying, a pressure-sensitive film is obtained.
4. Herstellung eines lösemittelfreien Klebstoffes4. Production of a solvent-free adhesive
250 Gewichtsteile Isodecylmethacrylat, 200 Gewichtsteile 2- Hydroxyethylacrylat, 50 Gewichtsteile Acrylsäure, 5 Gewichtsteile Irgacure 819 (CIBA Spezialitätenchemie) und 2,5 Gewichtsteile Tripropylenglykoldiacrylat werden vermischt . Die Verarbeitung erfolgt analog Beispiel 2. Man erhält einen haftklebenden Film. Der Umsatz beträgt mindestens 98 %.250 parts by weight of isodecyl methacrylate, 200 parts by weight of 2-hydroxyethyl acrylate, 50 parts by weight of acrylic acid, 5 parts by weight of Irgacure 819 (CIBA specialty chemicals) and 2.5 parts by weight of tripropylene glycol diacrylate are mixed. The processing is carried out analogously to Example 2. A pressure-sensitive adhesive film is obtained. The turnover is at least 98%.
5. Prüfung der Resistenz der Klebstoffe gegenüber reaktiven Gießharzen5. Testing the resistance of the adhesives to reactive casting resins
Die Klebefilme wurden auf ein Aluminiumblech appliziert und an den Rändern mit Isocyanat (HDI) überschichtet, so dass das Isocyanat sowohl Kontakt zum Klebstoff als auch zum Aluminiumsubstrat besaß. Die Proben wurden über 24 h beobachtet .The adhesive films were applied to an aluminum sheet and covered with isocyanate (HDI) at the edges so that the isocyanate was in contact with both the adhesive and the aluminum substrate. The samples were observed over 24 hours.
Die erfindungsgemäßen Klebstoffe zeichnen sich durch hohe Resistenz gegenüber reaktiven Substanzen aus. Gleichzeitig wird die Haftung auf polaren Substraten gegenüber konventionellen (acrylsäurehaltigen) Klebstoffen nicht negativ beeinflusst. The adhesives according to the invention are notable for high resistance to reactive substances. At the same time, the adhesion to polar substrates compared to conventional (acrylic acid-containing) adhesives is not adversely affected.

Claims

Ansprüche Expectations
1. Polymerzusammensetzung, herstellbar durch Polymerisation von a) 1 bis 50 Gew.-% polaren (Meth)Acrylaten mit Zerewitinoffschem Wasserstoff, b) 50 bis 99 Gew.-% apolaren (Meth)Acrylaten, c) bis zu 10 GΘW.-% eines zwei-, drei- oder höherfunktionellen (Meth)Acrylats oder einer gegenüber Zerewitinoffsehen Wasserstoffen reaktiven1. Polymer composition, producible by polymerizing a) 1 to 50% by weight of polar (meth) acrylates with Zerewitinoff hydrogen, b) 50 to 99% by weight of apolar (meth) acrylates, c) up to 10% by weight of a two-, three- or higher functional (meth) acrylate or one which is reactive towards hydrogen from Zerewitin
(poly) funktionellen Verbindung, wobei sich die Anteile a) bis c) zu 100 Gew.-% addieren, d) 0,05 bis 5 Gew.-% eines Initiators, bezogen auf die Summe der Komponenten aus a) bis c), wobei sich die Gew.-% unter a) bis d) zu 100 Gew.-% addieren, und e) bis zu 90 Gew. -% eines flüssigen, chemisch inerten Mediums, bezogen auf die Summe der Komponenten aus a) bis d).(poly) functional compound, the proportions a) to c) adding up to 100% by weight, d) 0.05 to 5% by weight of an initiator, based on the sum of the components from a) to c), where the% by weight under a) to d) add up to 100% by weight, and e) up to 90% by weight of a liquid, chemically inert medium, based on the sum of the components from a) to d) ,
2. Polymerzusammensetzung nach Anspruch 1, dadurch gekennzeichnet, dass die polaren (Meth)Acrylate keine Carboxylgruppen aufweisen.2. Polymer composition according to claim 1, characterized in that the polar (meth) acrylates have no carboxyl groups.
3. Polymerzusammensetzung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die polaren (Meth) crylate aus der Gruppe ausgewählt sind, die aus 2-Hydroxyethyl(meth) - acrylat, 3-Hydroxypropyl- (meth) acrylat, 4-Hydroxybutyl-3. Polymer composition according to claim 1 or 2, characterized in that the polar (meth) crylates are selected from the group consisting of 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl
(meth) acrylat, PEG- (Meth)Acrylaten, 2-Aminoethyl (meth) - acrylat, 3-Amino-propyl (meth) acrylat und 4-Aminobutyl- (meth) acrylat besteht.(meth) acrylate, PEG (meth) acrylates, 2-aminoethyl (meth) acrylate, 3-amino-propyl (meth) acrylate and 4-aminobutyl (meth) acrylate.
4. Polymerzusammensetzung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die polaren4. Polymer composition according to one of the preceding claims, characterized in that the polar
(Meth)Acrylate aus der Gruppe der Hydroxy(meth) acrylate ausgewähl sind. (Meth) acrylates are selected from the group of the hydroxy (meth) acrylates.
5. Polymerzusammensetzung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die polaren (Meth)Acrylate aus der Gruppe der Amino (meth) acrylate ausgewählt sind.5. Polymer composition according to one of claims 1 to 3, characterized in that the polar (meth) acrylates are selected from the group of amino (meth) acrylates.
6. Polymerzusammensetzung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die unpolaren (Meth)Acrylate Veresterungsprodukte von Acrylsäure oder Methacrylsäure mit einwertigen Alkoholen oder Aminen sind.6. Polymer composition according to one of the preceding claims, characterized in that the non-polar (meth) acrylates are esterification products of acrylic acid or methacrylic acid with monohydric alcohols or amines.
7. PolymerZusammensetzung nach Anspruch 6, dadurch gekennzeichne , dass die unpolaren (Meth) crylate aus der Gruppe der Alkyl (meth) aerylamide ausgewählt ist.7. Polymer composition according to claim 6, characterized in that the non-polar (meth) crylate is selected from the group of alkyl (meth) aerylamides.
8. Polymerzusammensetzung nach Anspruch 6, dadurch gekennzeichnet, dass das die unpolaren (Meth)Acrylate Veresterungsprodukte von Acrylsäure oder Methacrylsäure mit einwertigen, 6 bis 15 C-Atome, vorzugsweise 6 bis 10 C- Atome, aufweisenden Alkoholen sind.8. The polymer composition according to claim 6, characterized in that the nonpolar (meth) acrylates are esterification products of acrylic acid or methacrylic acid with monohydric alcohols having 6 to 15 carbon atoms, preferably 6 to 10 carbon atoms.
9. Folymerzusammensetzung nach Anspruch 8, dadurch gekennzeichnet, dass die unpolaren (Meth)Acrylate aus der Gruppe ausgewählt sind, die aus Methyl (meth) acrylat, Ethyl (meth) acrylat, Butyl (meth) acrylat, Hexyl (meth) acrylat, Isooctyl (meth) acrylat, 2-Ethylhexyl (meth) acrylat, Isodecyl (meth) acrylat und Isobornyl (meth) acrylat besteht .9. The film composition according to claim 8, characterized in that the non-polar (meth) acrylates are selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate and isobornyl (meth) acrylate.
10. Polymerzusammensetzung gemäß einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zwei-, drei- oder höherfunktionellen (Meth)Acrylate aus der Gruppe ausgewählt sind, die aus den Umsetzungsprodukten der (Meth)Acrylsäure mit Di-, Tri- oder Polyolen, den analogen Vinylethern oder Mischungen davon, sowie (meth) acrylierten Polyestern und (meth) acrylierten Polyurethanen besteht. 10. Polymer composition according to one of the preceding claims, characterized in that the two-, three- or higher functional (meth) acrylates are selected from the group consisting of the reaction products of (meth) acrylic acid with di-, tri- or polyols analog vinyl ethers or mixtures thereof, and (meth) acrylated polyesters and (meth) acrylated polyurethanes.
11. Polymerzusammensθtzung nach Anspruch 10, dadurch gekennzeichnet, dass die (meth) crylierten Polyester Umsetzungsprodukte von OH-terminierten Polyesterpolyolen mit (Meth)Acrylsäure oder Reaktionsprodukte von carboxylgruppenhaltigen Polyesterpolyolen mit hydroxylgruppenhaltigen (Meth)Acrylaten sind.11. The polymer composition according to claim 10, characterized in that the (meth) crylated polyester are reaction products of OH-terminated polyester polyols with (meth) acrylic acid or reaction products of carboxyl-containing polyester polyols with hydroxyl-containing (meth) acrylates.
12. Polymerzusammensetzung nach Anspruch 10, dadurch gekennzeichnet, dass die (meth) acrylierten Polyurethane Umsetzungsprodukte von amin- oder hydroxylterminierten12. Polymer composition according to claim 10, characterized in that the (meth) acrylated polyurethanes are reaction products of amine- or hydroxyl-terminated
(Meth)Acrylaten mit Di- oder Polyisocyanaten sind.Are (meth) acrylates with di- or polyisocyanates.
13. Polymerzusammensetzung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die gegenüber Zerewitinoffschem Wasserstoff aktive Verbindung aus der Gruppe ausgewählt ist, die aus Mono-, Di- und Polyepoxiden besteht .13. Polymer composition according to one of the preceding claims, characterized in that the compound active against Zerewitinoff hydrogen is selected from the group consisting of mono-, di- and polyepoxides.
14. Polymerzusammensetzung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die gegenüber Zerewitinoffschem Wasserstoff aktive Verbindung aus der Gruppe ausgewählt ist, die aus Mono-, Di- und Polyisocyanaten besteht.14. Polymer composition according to one of claims 1 to 13, characterized in that the active against Zerewitinoff hydrogen is selected from the group consisting of mono-, di- and polyisocyanates.
15. Polymerzusammensetzung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die gegenüber Zerewitinoffschem Wasserstoff aktive Verbindung aus der Gruppe ausgewählt ist, die aus Mono-, Di- und Polyaziridinen besteht.15. Polymer composition according to one of claims 1 to 13, characterized in that the active against Zerewitinoff hydrogen is selected from the group consisting of mono-, di- and polyaziridines.
16. Polymerzusammensetzung nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die gegenüber Zerewitinoffschem Wasserstoff aktive Verbindung aus der Gruppe ausgewählt ist, die aus Melamin und dessen Derivaten besteht . 16. Polymer composition according to any one of claims 1 to 13, characterized in that the compound active against Zerewitinoff hydrogen is selected from the group consisting of melamine and its derivatives.
17. Verfahren zur Herstellung einer Polymerzusammensetzung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet. dass es eine Polymerisationsreaktion umfasst, die lösemittelfrei, in Wasser oder in einem organischen, inerten Lösemittel erfolgt.17. A method for producing a polymer composition according to any one of the preceding claims, characterized. that it comprises a polymerization reaction that is solvent-free, in water or in an organic, inert solvent.
18. Verwendung der Polymerzusammensetzung nach einem der Ansprüche 1 bis 16 als Klebstoff oder als Dichtstoff.18. Use of the polymer composition according to one of claims 1 to 16 as an adhesive or as a sealant.
19. Verwendung der Polymerzusammensetzung nach einem der Ansprüche 1 bis 16 zur Herstellung von Haftklebebändern. 19. Use of the polymer composition according to one of claims 1 to 16 for the production of PSA tapes.
EP03810955A 2002-11-14 2003-10-31 Chemically inert contact adhesive having improved adhesive properties, method for the production thereof Withdrawn EP1560859A2 (en)

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DE10252978A DE10252978A1 (en) 2002-11-14 2002-11-14 Chemically inert pressure sensitive adhesive with improved adhesion, process for its production and use
DE10252978 2002-11-14
PCT/EP2003/012116 WO2004044021A2 (en) 2002-11-14 2003-10-31 Chemically inert contact adhesive having improved adhesive properties, method for the production thereof

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