WO2013013590A1 - Optically clear liquid adhesive composition and the use thereof - Google Patents

Optically clear liquid adhesive composition and the use thereof Download PDF

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Publication number
WO2013013590A1
WO2013013590A1 PCT/CN2012/078825 CN2012078825W WO2013013590A1 WO 2013013590 A1 WO2013013590 A1 WO 2013013590A1 CN 2012078825 W CN2012078825 W CN 2012078825W WO 2013013590 A1 WO2013013590 A1 WO 2013013590A1
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Prior art keywords
meth
acrylate
adhesive composition
parts
carbon atoms
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PCT/CN2012/078825
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French (fr)
Inventor
James Wang
Nicolas ZHOU
Daniel Lu
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Henkel (China) Company Limited
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Publication of WO2013013590A1 publication Critical patent/WO2013013590A1/en

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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
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
    • C09J175/04—Polyurethanes
    • C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
    • C09J175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
    • 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
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • 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
    • C08F290/067—Polyurethanes; Polyureas
    • 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
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/67—Unsaturated compounds having active hydrogen
    • C08G18/671—Unsaturated compounds having only one group containing active hydrogen
    • C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/08—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • 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
    • C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen

Definitions

  • the present invention relates to the field of adhesives, specifically to optically clear liquid adhesive compositions and the use thereof.
  • the adhesive tapes have a disadvantage that when used in bonding, they introduce stresses between the bonded substrates, lead to a decline in the adhesion quality between the bonded substrates, and the adhesive tapes do not have good optical transparency.
  • Liquid adhesives can be used to bond/laminate display parts, such as glass or plastic lenses, to a glass or plastics containing ITO (tin-doped indium oxide) in touch panels, or to bond/laminate touch panels or lenses to components of a liquid crystal display device.
  • ITO titanium-doped indium oxide
  • US patent US7,297,400 B2 discloses a curable pressure-sensitive adhesive composition for optical structures, which comprise: a) acrylate copolymers, e.g. a copolymer of isooctyl acrylate/methyl acrylate/acrylic acid or a copolymer of isooctyl acrylate/acrylic acid; b) acrylate oligomers with mono functionality and a Tg of less than 20°C; c) acrylate oligomers with 2-5 acrylate groups and a Tg of less than 20°C; and d) photoinitiator, and the amount of monofunctional acrylate oligomers used is bigger than the amount of multifunctional acrylate oligomers.
  • acrylate copolymers e.g. a copolymer of isooctyl acrylate/methyl acrylate/acrylic acid or a copolymer of isooctyl acrylate/acrylic acid
  • the adhesive composition obtained is optically clear in uncured and/or cured states, so it can be used in the preparation of optical elements, such as computer displays, CRT, anti-reflection films and polarizer.
  • This patent is aimed at improving the haze value, transmittance, humidity resistance, heat stability, etc. by choosing suitable acrylate oligomers.
  • This patent does not mention the problem of introducing stresses to optical structures by the adhesives, or deal with the hardness property after cured of the adhesive composition.
  • PCT application WO 2009/045889 discloses an optical part in which an optically clear pressure-sensitive adhesive is used, which comprises a component A: 50-95 parts of alkyl (meth)acrylates, wherein the alkyl has 4-18 carbon atoms with a Tg less or equal to 25°C; and at least one of the following component B and component C: Component B: 30-50 parts of (meth)acrylate monomers with a Tg higher than 25°C; and Component C: 1-40 parts of functional monomers selected from the group consisting of hydroxyalkyl (meth)acrylate, unsubstituted (meth)acrylamide, N-alkyl substituted (meth)acrylamide, N,N-dialkyl substituted (meth)acrylamide, monomers containing carbamide group, etc.
  • This patent is aimed at improving the compatibility of the adhesive that directly contacts with ITO (tin-doped indium oxide) in some touch panels, with ITO to ensure that the impact of the adhesive on the electrical resistance of the ITO is minimum.
  • ITO indium-doped indium oxide
  • the present invention provides a optically clear liquid adhesive composition which has sufficient elasticity after being cured to reduce the stress introduced by the adhesive between the substrates bonded, so that the bonding strength between the substrates can be well retained and the cured adhesive composition shows good optical transmittance.
  • the adhesive of the present invention can be used to bond or laminate various substrates, especially components of displays.
  • the present invention provides an optically clear liquid adhesive composition, which comprises at least one of the following components (a) and (b):
  • plasticizers 0 to 20 parts of one or more plasticizers, preferably liquid plasticizers;
  • the average functionality of the (meth)acrylyloxy group in the aliphatic polyether urethane oligomer containing (meth)acrylyloxy group(s) as component (a) is preferably more than 0 and less than or equal to 2; component (a) has a T g preferably from -80 to 0°C; the average
  • component (b) functionality of the (meth)acrylyloxy group in the (meth)acrylate oligomer as component (b) is preferably more than 0 and less than or equal to 2, and component (b) has a T g preferably from -80 to 0°C.
  • the elasticity of the adhesive composition of the present invention after being cured can be adjusted by using different aliphatic polyether urethane oligomers containing UV-curable (meth)acrylyloxy group(s) or by different (meth)acrylate oligomers.
  • the obtained adhesive compositions have a Brookfield viscosity preferably from 100 to 15000 mPa.s at 25°C, a hardness range preferably from Shore 00 10 to Shore A 40 after being cured and a transmittance preferably higher than 90 % .
  • the elasticity of the cured adhesive could be further improved by adding some specific acrylic acids monomers or plasticizers, preferably liquid plasticizers.
  • Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C). The shear rate is viscosity-dependent.
  • optically clear liquid adhesive compositions of the present invention can be used for bonding or laminating various substrates, especially in the assembly of optical components, or for bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate.
  • the structure formulae and component contents are idealized, most of which represent main structures and main components, allowing the existence of industrial permitted divergence.
  • component (a) is one or more aliphatic polyether urethane oligomers preferably containing UV-curable (meth)acrylyloxy group(s).
  • the average functionality of the (meth)acrylyloxy group is preferably more than 0 and less than or equal to 2, more preferably 0.5 to 1.5.
  • the expression "average functionality" means the average number of the (meth)acrylyloxy groups in every molecule of the aliphatic polyether urethane oligomer.
  • the (meth)acrylyloxy group could be located at any sites of the polyether urethane molecular chains, preferably at the end sites of the molecular chains.
  • the aliphatic polyether chain segments of the aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) as component (a) are preferably selected from the following polyether chain segments: polyethylene oxide, polypropylene oxide, polytetrahydrofuran and so on.
  • the aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) as component (a) preferably has a T g from -80 to 0°C, more preferably from -50 to 0°C; a Brookfield viscosity preferably from 5000 to 60000 mPa.s at 50°C, more preferably from 20000 to 55000 mPa.s, or a Brookfield viscosity preferably from 5000 to 50000 mPa.s at 60°C, more preferably from 9000 to 40000 mPa.s, or a Brookfield viscosity preferably from 10000 to 80000 mPa.s at 25°C, more preferably from 20000 to 70000 mPa.s.
  • the amount of component (a) could be 10 to 80 parts by weight, preferably 20 to 70 parts by weight, more preferably 10 to 60 parts by weight based on 100 parts by weight of the adhesive composition.
  • the (meth)acryloxy group may be at any position in the oligomer molecule , preferably at the end of the backbone and/or in the side chain.
  • component (b) is one or more (meth)acrylate oligomers.
  • Component(b) is one or more (meth)acrylate oligomers preferably obtained via the polymerization of a (meth)acrylate monomer selected from the group consisting of alkyl (meth)acrylate, alkenyl (meth)acrylate, and heterocyclic (meth)acrylate; wherein the alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and may have one or more substituents which are selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, hydroxyl and the like; the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and may have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to
  • the preferred representative examples of the above mentioned (meth)acrylate are: methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofurfury (meth)acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2-phenoxyethyl acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth)acrylate, caprolactone acrylate, morpholine (meth)acrylate, hexanediol bi(meth)acryl
  • the average functionality of the (meth)acrylate oligomers as component (b) is preferably more than 0 and less than or equal to 2, more preferably from 0.5 to 2, wherein the expression "average functionality" means the average number of the (meth)acrylyloxy groups in every molecule of the (meth)acrylate oligomers.
  • the (meth)acrylate oligomer of component (b) has a Tg preferably from -80 to 0°C, more preferably from -60 to 0°C.
  • the (meth)acrylate oligomer of component (b) has a Brookfield viscosity of preferably 10000 to 50000 mPa.s at 25°C, preferably 20000 to 40000 mPa.s at 25°C. Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C). The shear rate is viscosity-dependent.
  • the (meth)acrylate oligomer of component (b) improves the hardness of the adhesive and increase the binding strength.
  • the amount of component (b) could be 10 to 80 parts by weight, preferably 20 to 70 parts by weight, more preferably 10 to 60 parts by weight based on 100 parts by weight of the adhesive composition.
  • component (c) (meth)acrylate monomers or oligomers without any functional groups
  • component (c) is one or more (meth)acrylate monomers or oligomers without any functional groups.
  • the expression "functional group” here means a group having reaction activity, such as a hydroxyl group, an amine group, an amide group, a carboxyl group, etc.
  • the (meth)acrylate monomers without any functional groups as component (c) can preferably be selected from the group consisting of alkyl (meth)acrylate, alkenyl (meth)acrylate, and heterocyclic (meth)acrylate; wherein the alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and may have one or more substituents which are selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms and the like; the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and may have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, and so on; the heterocyclic group preferably has 2 to
  • Component (c) can be one or more selected from the above-mentioned monomers, and can also be one or more oligomers polymerized from the above-mentioned monomers.
  • the oligomer preferably has a Brookfield viscosity of less than 1000 mPa.S at 50°C, and a weight average molecular weight of preferably less than 2000, and a Tg of from -80 to 100°C.
  • component(c) include one or more selected from the group consisting of: methyl (meth)acrylate, ethyl (meth)acrylate, mono-acrylate oligomer with a molecular weight of Mw ⁇ 2000, mono-acrylate oligomer with a molecular weight of Mw ⁇ 2000 containing carbamide or urethane structure, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofuran acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2- ethyl acrylate, 2-phenoxyethyl acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, dicyclopentadienyl methacrylate and the combination thereof.
  • Component (c) is used to adjust the viscosity or increase the system compatibility.
  • the amount of component (c) is 1 to 42 parts by weight, preferably 5 to 35 parts by weight based on 100 parts by weight of the adhesive composition.
  • component (d) is one or more photoinitiator.
  • photoinitiator used in the adhesive compositions of the present invention.
  • Any suitable photoinitiator known in the art can be used, and preferable examples of photoinitiator include: 2,2-dimethoxy-l,2-diphenylethane-l-one, trimethylbenzoyldiphenyl phosphorus oxides, 1-hydroxycyclohexyl benzophenone, 2-methyl-l-[4-(methylthio)phenyl]-2-morpholine propane-l-one and the combination thereof; wherein 2,2-dimethoxy-l,2-diphenylethane-l-one and 1-hydroxycyclohexyl benzophenone are preferred.
  • component (d) is 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight based on 100 parts by weight of the adhesive composition.
  • component (e) is optionally present and it is one or more monomers selected from (meth)acrylamide, (meth)acrylic acid, and (meth)acrylate containing functional group(s).
  • functional group means a group having reaction activity, such as a hydroxyl group, an amine group, a carboxyl group, etc.
  • the (meth)acrylamide monomer of component (e) can be unsubstituted (meth)acrylamide, or N-alkyl substituted (meth)acrylamide or ⁇ , ⁇ -dialkyl substituted (meth)acrylamide, wherein the alkyl group is selected from aliphatic alkyl groups having 1 to 20 carbon atoms, preferably having 1 to 10 carbon atoms, and arylalkyl groups having 6 to 20 carbon atoms, preferably having 6 tolO carbon atoms, wherein the aliphatic alkyl groups include linear, branched and cyclic alkyl groups. Aliphatic alkyl groups having 1 to 8 carbon atoms are preferred.
  • component (e) include N-ethyl acrylamide, N-octyl acrylamide, ⁇ , ⁇ -dimethyl acrylamide, ⁇ , ⁇ -diethyl acrylamide, etc.
  • the (meth)acrylate monomers containing functional group(s) of component(e) is preferably alkyl (meth)acrylate, wherein the alkyl has functional group(s) selected from a hydroxyl group, an amine group and a carboxyl group.
  • the alkyl is selected from aliphatic alkyl groups having 1 to 20 carbon atoms, preferably having 1 tolO carbon atoms; and arylalkyl groups having 6 to 20 carbon atoms of, preferably having 6 to 10 carbon atoms of, wherein the aliphatic alkyl groups includes linear, branched and cyclic alkyl groups.
  • the aliphatic alkyl having 1 to 8 carbon atoms are preferred.
  • the (meth)acrylate containing functional group(s) comprise hydroxyalkyl (meth)acrylate, particularly 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2(4)-hydroxybutyl (meth)acrylate and the combination thereof.
  • Component (e) is used to adjust the binding strength of the adhesive, or used as tackifier.
  • the amount of component (e) is 0 to 30 parts by weight, preferably 1 to 20 parts by weight based on 100 parts by weight of the adhesive composition.
  • component (f) is optionally present and it is one or more plasticizers, preferably liquid plasticizers, which for example is selected from terpine resins with a weight average molecular weight (Mw) of less than 8000, such as DERCOLYTE A 10, DERCOLYTE L 115, DERCOLYTE L 120, DERCOLYTE LTG, DERCOLYTE M 105, DERCOLYTE M 115, DERCOLYTE M 120, DERTOPHENE T 115, etc. which are commercially available from French company DRP; and Clearon 85, Clearon K 100, Clearon K 110, Clearon M105, Clearon M 115, Clearon P 85, Clearon P 105, etc.
  • plasticizers preferably liquid plasticizers, which for example is selected from terpine resins with a weight average molecular weight (Mw) of less than 8000, such as DERCOLYTE A 10, DERCOLYTE L 115, DERCOLYTE L 120, DERCOLYTE LTG,
  • the plasticizer, preferably liquid plasticizer, of component (f) can also be selected from substituted or unsubstituted polyisoprene, polybutadiene or polybutylene rubber with a weight average molecular weight of 1000 to 8000, wherein the substituent is preferably a carboxyl group at the ends of the molecule.
  • Component (f) is particularly preferred to be polybutadiene with terminal carboxyl groups and having a weight average molecular weight of 1000 to 8000.
  • Component (f) is used to adjust the hardness of the cured adhesive.
  • the amount of component (f) is 0 to 20 parts by weight, preferably 1 to 10 parts by weight based on 100 parts by weight of the adhesive composition.
  • the components of the adhesive composition of the present invention can be mixed by any suitable method and in any suitable order, and the mixing can be carried out continuously or intermittently. In the process of mixing, stir as needed, and in different stages of mixing, the stirring rate could be the same or different.
  • the adhesive composition is prepared in the following way: each component of the adhesive composition is added to a mixer, and is mixed for 3 to 10 min under a higher stirring rate of 2000 ⁇ 2400 rpm to obtain the adhesive composition.
  • the adhesive composition is prepared in the following way: each component of the adhesive composition is added to a mixer, and is mixed for 30 to 100 min under a lower stirring rate of 80 ⁇ 150 rpm to obtain the adhesive composition.
  • the adhesive composition of the present invention preferably has a Brookfield viscosity of 100 to 15000 mPa.s at 25°C, more preferably a Brookfield viscosity of 700 to 11000 mPa.s at 25°C, preferably a hardness range of Shore 00 10 to Shore A 40, and a transmittance of preferably more than 90%. Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C).
  • the adhesive composition of the present invention can be used for bonding or laminating various substrates, for example various components in a display, especially in the assembly of optical components, or the bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate.
  • the optically transparent substrates include, for example, glass or optically transparent plastic or the like;
  • the opaque substrates include, for example, metal, opaque plastic, ceramics, stone, leather or wood, etc.
  • Using the adhesive composition of the present invention for bonding or laminating glass substrate-to-glass substrate is the most preferred.
  • the adhesive composition of the present invention has a novel formulation by introducing the aliphatic polyether urethane oligomer containing (meth)acrylyloxy group preferably with a low Tg and preferably low average functionality, and/or the (meth)acrylate oligomer having preferably a low Tg and preferably low average functionality.
  • the adhesive composition has very good elasticity after being cured which reduces the stress introduced by the bonding between the bonded substrates, and is advantageous for maintaining the bonding strength between the substrates.
  • the adhesive compositions of the present invention have the following advantages: 1) having stronger bonding strength; 2) easier in bonding uneven surfaces; 3) convenient for the bonding of rigid-to-rigid substrates. Additionally, the adhesive compositions of the present invention have excellent optically clear properties after cured.
  • Aliphatic polyether urethane oligomer A containing acrylyloxy groups BR3641AA (Bomar Company), with an average functionality of 1.3, a viscosity of about 24000 mPa.s/50°C, and a Tg of about -50°C;
  • Aliphatic polyether urethane oligomer B containing acrylyloxy groups BR3741AB (Bomar Company), with an average functionality of 1.3, a viscosity of about 55000 mPa.s/50°C, and a Tg of about -49°C;
  • Aliphatic polyether urethane oligomer C containing acrylyloxy groups Genomer 4188/M22 (Rahn AG Company), with an average functionality of about 1, a viscosity of about 70000 mPa.s/25°C, and a Tg of about -3°C;
  • Aliphatic polyether urethane oligomer D containing acrylyloxy groups Genomer3414 (Rahn AG Company, with an average functionality of 4, a viscosity of about 45000 mPa.s/25°C, and a Tg of about -17°C.
  • Aliphatic polyether urethane oligomer E containing acrylyloxy groups CN8004 (Sartomer Company), with an average functionality of less than 2, a viscosity of about 9000 mPa.s/60°C, and a Tg of about -3°C.
  • Acrylate oligomer A BR344 (Bomar Company), with an average functionality of 2, a viscosity of about 20000 mPa.s/25°C, and a Tg of about -48°C.
  • Acrylate oligomer B Genomer6043/M22 (Rahn AG Company), with an average functionality of less than 1, a viscosity of about 40000 mPa.s/25°C, and a Tg of about -18°C.
  • Polybutadiene A with terminal carboxyl groups PolyBD3000CT (Cray Valley Company), with a molecular weight of about 3000.
  • the viscosity in the present invention is Brookfield viscosity, and is measured under temperatures of 25 °C, 50°C or 60°C respectively according to ASTM D1084.
  • Brookfield viscosity (Dynamic) in the examples was measured with a Brookfield Viscometer Model RVT DV-II (CP52, 25°C). The shear rate is viscosity-dependent.
  • Adhesive compositions Viscosity (mPa.s) Shear Rate (RPM)
  • the hardness was tested according to ASTM D2240 and Shore 00 hardness and Shore A hardness were measured;
  • the haze value was tested according to ASTM D1003.
  • the transmittance was tested according to ASTM E903.
  • a polyvinyl chloride film with an average thickness of 0.18 mm is placed on a glass plate of 150mm*150mm*4mm, then a stainless steel frame with a thickness of 2mm is placed thereon and about 30g of the adhesive composition of the present invention are added in, then another polyvinyl chloride film with an average thickness of 0.18 mm is placed on the top and covered with another glass plate of 150mm*150mm*4mm.
  • the sample is put under UV light for two minutes to be sufficiently cured (each side one minute, the UV strength is 100 mW/cm 2 ).
  • An adhesive composition was prepared in accordance with the following formulation:
  • the obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 50 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 60 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 5500 mPa.s/25°C, a Shore 00 hardness of ShOO 40 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • Component (a) 38 parts aliphatic polyether urethane oligomer A containing
  • Component (a) 30 parts aliphatic polyether urethane oligomer E containing
  • Component (c) 20 parts bicyclopentadieneoxyethyl methacrylate
  • Component (c) 7 parts isobornyl acrylate
  • Component (d) 1 parts 1-hydroxycyclohexyl benzophenone
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 11000 mPa.s/25°C, a Shore 00 hardness of ShOO 70 after being cured, a haze value of ⁇ 2%, and a transmittance of >98 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 2500 mPa.s/25°C, a Shore 00 hardness of ShOO 30 after being cured, a haze value of ⁇ 0.5 , and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • Component (d) 3 parts 1-hydroxycyclohexyl benzophenone
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 2700 mPa.s/25°C, a Shore 00 hardness of ShOO 46 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 3000 mPa.s/25°C, a Shore 00 hardness of ShOO 32 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 700 mPa.s/25°C, a Shore 00 hardness of ShOO 23 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 1200 mPa.s/25°C, a Shore 00 hardness of ShOO 40 after being cured, a haze value of ⁇ 0.5%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • Component (a) 50 parts aliphatic polyether urethane oligomer A containing
  • Component (c) 20 parts lauryl acrylate
  • Component (c) 10 parts bicyclopenteneoxyethyl methacrylate
  • Component (d) 2 parts 1-hydroxycyclohexyl benzophenone
  • Component (e) 2 parts acrylic acid
  • Component (f) 10 parts polybutadiene A with terminal carboxyl groups
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 50 after being cured, a haze value of ⁇ 0.5 , and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • the preparation method of the adhesive composition was the same as that in Example 1.
  • the obtained adhesion composition has a viscosity of about 2500 mPa.s/25°C, a Shore 00 hardness of ShOO 25 after being cured, a haze value of ⁇ 1.0%, and a transmittance of >99 .
  • An adhesive composition was prepared in accordance with the following formulation:
  • Component (a) 30 parts aliphatic polyether urethane oligomer D containing
  • Component (a) 38 parts aliphatic polyether urethane oligomer E containing
  • Component (d) 1 parts 1-hydroxycyclohexyl benzophenone
  • the obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of Sh00>80 after being cured, a haze value of >5.0%, and a transmittance of ⁇ 90 .
  • the adhesive compositions of the present invention have a hardness from Shore 00 10 to Shore A 40 after being cured, by using the aliphatic polyether urethane oligomers containing (meth)acrylyloxy groups with a low Tg and low functionality, or the acrylate oligomers with a low Tg and low functionality, so that when the adhesive composition is applied between substrates, the stress introduced by the adhesive between the bonded substrates are reduced to remain the bonding between the substrates well; moreover, the adhesive compositions of the present invention have an excellent optical transmittance after cured.

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Abstract

The present invention relates to an optically clear liquid adhesive composition and the use thereof. The composition comprises at least one of the following components (a) and (b): (a) 10 to 80 parts of one or more aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s); (b) 10 to 80 parts of one or more (meth)acrylate oligomers, and additionally: (c) 1 to 42 parts of one or more (meth)acrylate monomers or oligomers without any functional groups; (d) 0.5 to 5 parts of one or more photoinitiators; (e) 0 to 30 parts of one or more monomers selected from (meth)acrylamide, (meth)acrylic acid, and (meth)acrylate containing functional group(s); and (f) 0 to 20 parts of one or more plasticizers; all the parts are parts by weight based on 100 parts by weight of the adhesive composition. The optically clear liquid adhesive composition of the present invention can be used for bonding or laminating various substrates, especially in the assembly of optical components, or for bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate.

Description

Optically Clear Liquid Adhesive Composition and the Use Thereof
The present invention relates to the field of adhesives, specifically to optically clear liquid adhesive compositions and the use thereof.
Along with the development of display device, such as touch panel technique, the requirements on adhesives used in these devices are increasingly higher, for example, the adhesive needs to be convenient for application, easy to cure, with good transmittance and strong bonding strength, etc. Any stress introduced via the bonding of the adhesives would affect the performance of the display device.
Currently used adhesives in touch panels are mainly in the form of optically clear adhesive tapes. However, the adhesive tapes have a disadvantage that when used in bonding, they introduce stresses between the bonded substrates, lead to a decline in the adhesion quality between the bonded substrates, and the adhesive tapes do not have good optical transparency.
Liquid adhesives can be used to bond/laminate display parts, such as glass or plastic lenses, to a glass or plastics containing ITO (tin-doped indium oxide) in touch panels, or to bond/laminate touch panels or lenses to components of a liquid crystal display device.
US patent US7,297,400 B2 discloses a curable pressure- sensitive adhesive composition for optical structures, which comprise: a) acrylate copolymers, e.g. a copolymer of isooctyl acrylate/methyl acrylate/acrylic acid or a copolymer of isooctyl acrylate/acrylic acid; b) acrylate oligomers with mono functionality and a Tg of less than 20°C; c) acrylate oligomers with 2-5 acrylate groups and a Tg of less than 20°C; and d) photoinitiator, and the amount of monofunctional acrylate oligomers used is bigger than the amount of multifunctional acrylate oligomers. According to the description of this patent, the adhesive composition obtained is optically clear in uncured and/or cured states, so it can be used in the preparation of optical elements, such as computer displays, CRT, anti-reflection films and polarizer. This patent is aimed at improving the haze value, transmittance, humidity resistance, heat stability, etc. by choosing suitable acrylate oligomers. This patent does not mention the problem of introducing stresses to optical structures by the adhesives, or deal with the hardness property after cured of the adhesive composition.
PCT application WO 2009/045889 discloses an optical part in which an optically clear pressure- sensitive adhesive is used, which comprises a component A: 50-95 parts of alkyl (meth)acrylates, wherein the alkyl has 4-18 carbon atoms with a Tg less or equal to 25°C; and at least one of the following component B and component C: Component B: 30-50 parts of (meth)acrylate monomers with a Tg higher than 25°C; and Component C: 1-40 parts of functional monomers selected from the group consisting of hydroxyalkyl (meth)acrylate, unsubstituted (meth)acrylamide, N-alkyl substituted (meth)acrylamide, N,N-dialkyl substituted (meth)acrylamide, monomers containing carbamide group, etc. This patent is aimed at improving the compatibility of the adhesive that directly contacts with ITO (tin-doped indium oxide) in some touch panels, with ITO to ensure that the impact of the adhesive on the electrical resistance of the ITO is minimum. This patent does not mention the problem of introducing stresses to optical structures by the adhesives, or deal with the hardness property after cured of the pressure- sensitive adhesive.
The present invention provides a optically clear liquid adhesive composition which has sufficient elasticity after being cured to reduce the stress introduced by the adhesive between the substrates bonded, so that the bonding strength between the substrates can be well retained and the cured adhesive composition shows good optical transmittance. The adhesive of the present invention can be used to bond or laminate various substrates, especially components of displays.
The present invention provides an optically clear liquid adhesive composition, which comprises at least one of the following components (a) and (b):
(a) 10 to 80 parts of one or more aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s);
(b) 10 to 80 parts of one or more (meth)acrylate oligomers;
and additionally:
(c) 1 to 42 parts of one or more (meth)acrylate monomers or oligomers without any functional groups;
(d) 0.5 to 5 parts of one or more photoinitiator;
(e) 0 to 30 parts of one or more monomers selected from the group consisting of (meth)acrylamide, (meth)acrylic acid, and (meth)acrylate containing functional group(s); and
(f) 0 to 20 parts of one or more plasticizers, preferably liquid plasticizers;
wherein all the parts are by weight based on 100 parts by weight of the adhesive composition.
In the optically clear liquid adhesive compositions of the present invention, the average functionality of the (meth)acrylyloxy group in the aliphatic polyether urethane oligomer containing (meth)acrylyloxy group(s) as component (a) is preferably more than 0 and less than or equal to 2; component (a) has a Tg preferably from -80 to 0°C; the average
functionality of the (meth)acrylyloxy group in the (meth)acrylate oligomer as component (b) is preferably more than 0 and less than or equal to 2, and component (b) has a Tg preferably from -80 to 0°C. The elasticity of the adhesive composition of the present invention after being cured can be adjusted by using different aliphatic polyether urethane oligomers containing UV-curable (meth)acrylyloxy group(s) or by different (meth)acrylate oligomers. The obtained adhesive compositions have a Brookfield viscosity preferably from 100 to 15000 mPa.s at 25°C, a hardness range preferably from Shore 00 10 to Shore A 40 after being cured and a transmittance preferably higher than 90 % . Moreover, the elasticity of the cured adhesive could be further improved by adding some specific acrylic acids monomers or plasticizers, preferably liquid plasticizers.
Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C). The shear rate is viscosity-dependent.
The optically clear liquid adhesive compositions of the present invention can be used for bonding or laminating various substrates, especially in the assembly of optical components, or for bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate.
Unless otherwise defined, all the technical and scientific terms used here have the same meanings as a person skilled in the art commonly understands. In the case of conflict, meanings as defined in this description shall prevail.
Unless otherwise defined, all the percentages, parts, ratio, etc. are calculated by weight.
When an amount, concentration, or other values or parameters are represented in the form of a range, a preferred range, or a preferred higher value limit and a preferred lower value limit, it should be understood that it is equivalent to specifically disclose any ranges formed by combining any lower range limit or preferred value and any higher range limit or preferred value, regardless whether the ranges are specifically mentioned. Unless otherwise indicated, the ranges of values listed in this disclosure are designed to include the end points of the range, and all integers and fractions within the range.
Generally, in the field of adhesive, especially in the field of adhesive compositions of industrial scale, the structure formulae and component contents are idealized, most of which represent main structures and main components, allowing the existence of industrial permitted divergence.
The term "•••(meth)acryl*** " in this document covers "•••acryl*** " and/or "methacryl***; for example, the term " (meth)acryloxy group" represents acryloxy group, (meth)acryloxy group or their combination; for example, for example, the term " (meth)acrylic acid" represents acrylic acid, methacrylic acid or their combination; for example, the term " (meth)acrylate" represents acrylate, methacrylate or their combination; and for example, the term " (meth)acrylamide" represents acrylamide, methacrylamide or their combination.
Hereafter each component preferably contained in the adhesive composition of the present invention is illustrated in turn according to preferred embodiments:
Component (a): aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s)
In the optically clear liquid adhesive composition of the present invention, component (a) is one or more aliphatic polyether urethane oligomers preferably containing UV-curable (meth)acrylyloxy group(s).
In the aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) of component (a), the average functionality of the (meth)acrylyloxy group is preferably more than 0 and less than or equal to 2, more preferably 0.5 to 1.5. The expression "average functionality" means the average number of the (meth)acrylyloxy groups in every molecule of the aliphatic polyether urethane oligomer. The (meth)acrylyloxy group could be located at any sites of the polyether urethane molecular chains, preferably at the end sites of the molecular chains.
The aliphatic polyether chain segments of the aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) as component (a) are preferably selected from the following polyether chain segments: polyethylene oxide, polypropylene oxide, polytetrahydrofuran and so on.
The aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) as component (a) preferably has a Tg from -80 to 0°C, more preferably from -50 to 0°C; a Brookfield viscosity preferably from 5000 to 60000 mPa.s at 50°C, more preferably from 20000 to 55000 mPa.s, or a Brookfield viscosity preferably from 5000 to 50000 mPa.s at 60°C, more preferably from 9000 to 40000 mPa.s, or a Brookfield viscosity preferably from 10000 to 80000 mPa.s at 25°C, more preferably from 20000 to 70000 mPa.s.
Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at the given temperature, preferably 25 °C). The shear rate is viscosity-dependent. When the adhesive composition of the present invention contains component (a), the amount of component (a) could be 10 to 80 parts by weight, preferably 20 to 70 parts by weight, more preferably 10 to 60 parts by weight based on 100 parts by weight of the adhesive composition.
The structure of (meth)acryloxy group is CH2=CRC(0)0-, wherein R is H or Cf¼. The (meth)acryloxy group may be at any position in the oligomer molecule , preferably at the end of the backbone and/or in the side chain.
Component (b): (meth)acrylate oligomers
In the optically clear liquid adhesive composition of the present invention, component (b) is one or more (meth)acrylate oligomers.
Component(b) is one or more (meth)acrylate oligomers preferably obtained via the polymerization of a (meth)acrylate monomer selected from the group consisting of alkyl (meth)acrylate, alkenyl (meth)acrylate, and heterocyclic (meth)acrylate; wherein the alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and may have one or more substituents which are selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, hydroxyl and the like; the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and may have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, hydroxyl and so on; the heterocyclic group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, wherein the hetero atom is preferably selected from nitrogen and oxygen, and the heterocyclic group may further have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, hydroxyl and so on.
The preferred representative examples of the above mentioned (meth)acrylate are: methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofurfury (meth)acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2-phenoxyethyl acrylate, 2-ethylhexyl (meth)acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, dicyclopentadienyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth)acrylate, caprolactone acrylate, morpholine (meth)acrylate, hexanediol bi(meth)acrylate, ethylene glycol dimethacrylate, trimethylolpropane triacrylate, pentaerythritol tetrahydrofuran acrylate. The average functionality of the (meth)acrylate oligomers as component (b) is preferably more than 0 and less than or equal to 2, more preferably from 0.5 to 2, wherein the expression "average functionality" means the average number of the (meth)acrylyloxy groups in every molecule of the (meth)acrylate oligomers.
The (meth)acrylate oligomer of component (b) has a Tg preferably from -80 to 0°C, more preferably from -60 to 0°C.
The (meth)acrylate oligomer of component (b) has a Brookfield viscosity of preferably 10000 to 50000 mPa.s at 25°C, preferably 20000 to 40000 mPa.s at 25°C. Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C). The shear rate is viscosity-dependent.
The (meth)acrylate oligomer of component (b) improves the hardness of the adhesive and increase the binding strength.
When the adhesive composition of the present invention contains component (b), the amount of component (b) could be 10 to 80 parts by weight, preferably 20 to 70 parts by weight, more preferably 10 to 60 parts by weight based on 100 parts by weight of the adhesive composition.
Component (c): (meth)acrylate monomers or oligomers without any functional groups In the optically clear liquid adhesive composition of the present invention, component (c) is one or more (meth)acrylate monomers or oligomers without any functional groups. The expression "functional group" here means a group having reaction activity, such as a hydroxyl group, an amine group, an amide group, a carboxyl group, etc.
The (meth)acrylate monomers without any functional groups as component (c) can preferably be selected from the group consisting of alkyl (meth)acrylate, alkenyl (meth)acrylate, and heterocyclic (meth)acrylate; wherein the alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and may have one or more substituents which are selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms and the like; the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and may have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, and so on; the heterocyclic group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, wherein the hetero atom is preferably selected from nitrogen and oxygen, and the heterocyclic group may have substituents which are preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms, and so on.
Component (c) can be one or more selected from the above-mentioned monomers, and can also be one or more oligomers polymerized from the above-mentioned monomers. When component (c) is an oligomer, the oligomer preferably has a Brookfield viscosity of less than 1000 mPa.S at 50°C, and a weight average molecular weight of preferably less than 2000, and a Tg of from -80 to 100°C.
The preferred examples of component(c) include one or more selected from the group consisting of: methyl (meth)acrylate, ethyl (meth)acrylate, mono-acrylate oligomer with a molecular weight of Mw<2000, mono-acrylate oligomer with a molecular weight of Mw<2000 containing carbamide or urethane structure, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofuran acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2- ethyl acrylate, 2-phenoxyethyl acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, dicyclopentadienyl methacrylate and the combination thereof.
Component (c) is used to adjust the viscosity or increase the system compatibility.
In the adhesive composition of the present invention, the amount of component (c) is 1 to 42 parts by weight, preferably 5 to 35 parts by weight based on 100 parts by weight of the adhesive composition.
Component (d): photoinitiator
In the optically clear liquid adhesive composition of the present invention, component (d) is one or more photoinitiator.
There is no special limitation on the photoinitiator used in the adhesive compositions of the present invention. Any suitable photoinitiator known in the art can be used, and preferable examples of photoinitiator include: 2,2-dimethoxy-l,2-diphenylethane-l-one, trimethylbenzoyldiphenyl phosphorus oxides, 1-hydroxycyclohexyl benzophenone, 2-methyl-l-[4-(methylthio)phenyl]-2-morpholine propane-l-one and the combination thereof; wherein 2,2-dimethoxy-l,2-diphenylethane-l-one and 1-hydroxycyclohexyl benzophenone are preferred.
In the adhesive composition of the present invention, the amount of component (d) is 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight based on 100 parts by weight of the adhesive composition. Component (e): (meth) acrylamide, (meth)acrylic acid, and (meth)acrylate monomer containing functional groups
In the optically clear liquid adhesive compositions of the present invention, component (e) is optionally present and it is one or more monomers selected from (meth)acrylamide, (meth)acrylic acid, and (meth)acrylate containing functional group(s). The expression "functional group" means a group having reaction activity, such as a hydroxyl group, an amine group, a carboxyl group, etc.
The (meth)acrylamide monomer of component (e) can be unsubstituted (meth)acrylamide, or N-alkyl substituted (meth)acrylamide or Ν,Ν-dialkyl substituted (meth)acrylamide, wherein the alkyl group is selected from aliphatic alkyl groups having 1 to 20 carbon atoms, preferably having 1 to 10 carbon atoms, and arylalkyl groups having 6 to 20 carbon atoms, preferably having 6 tolO carbon atoms, wherein the aliphatic alkyl groups include linear, branched and cyclic alkyl groups. Aliphatic alkyl groups having 1 to 8 carbon atoms are preferred. Specifically preferred examples of component (e) include N-ethyl acrylamide, N-octyl acrylamide, Ν,Ν-dimethyl acrylamide, Ν,Ν-diethyl acrylamide, etc.
The (meth)acrylate monomers containing functional group(s) of component(e) is preferably alkyl (meth)acrylate, wherein the alkyl has functional group(s) selected from a hydroxyl group, an amine group and a carboxyl group. The alkyl is selected from aliphatic alkyl groups having 1 to 20 carbon atoms, preferably having 1 tolO carbon atoms; and arylalkyl groups having 6 to 20 carbon atoms of, preferably having 6 to 10 carbon atoms of, wherein the aliphatic alkyl groups includes linear, branched and cyclic alkyl groups. The aliphatic alkyl having 1 to 8 carbon atoms are preferred. Specifically preferred examples of the (meth)acrylate containing functional group(s) comprise hydroxyalkyl (meth)acrylate, particularly 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2(4)-hydroxybutyl (meth)acrylate and the combination thereof.
Component (e) is used to adjust the binding strength of the adhesive, or used as tackifier.
In the adhesive composition of the present invention, the amount of component (e) is 0 to 30 parts by weight, preferably 1 to 20 parts by weight based on 100 parts by weight of the adhesive composition.
Component (f): plasticizer, preferably liquid plasticizer
In the optically clear liquid adhesive compositions of the present invention, component (f) is optionally present and it is one or more plasticizers, preferably liquid plasticizers, which for example is selected from terpine resins with a weight average molecular weight (Mw) of less than 8000, such as DERCOLYTE A 10, DERCOLYTE L 115, DERCOLYTE L 120, DERCOLYTE LTG, DERCOLYTE M 105, DERCOLYTE M 115, DERCOLYTE M 120, DERTOPHENE T 115, etc. which are commercially available from French company DRP; and Clearon 85, Clearon K 100, Clearon K 110, Clearon M105, Clearon M 115, Clearon P 85, Clearon P 105, etc. which are commercially available from Japanese company Yasuhara. The plasticizer, preferably liquid plasticizer, of component (f) can also be selected from substituted or unsubstituted polyisoprene, polybutadiene or polybutylene rubber with a weight average molecular weight of 1000 to 8000, wherein the substituent is preferably a carboxyl group at the ends of the molecule. Component (f) is particularly preferred to be polybutadiene with terminal carboxyl groups and having a weight average molecular weight of 1000 to 8000.
Component (f) is used to adjust the hardness of the cured adhesive.
In the adhesive composition of the present invention, the amount of component (f) is 0 to 20 parts by weight, preferably 1 to 10 parts by weight based on 100 parts by weight of the adhesive composition.
Preparation method of the adhesive composition of the present invention
There is no limitation on the preparation methods for the adhesive composition of the present invention. The components of the adhesive composition of the present invention can be mixed by any suitable method and in any suitable order, and the mixing can be carried out continuously or intermittently. In the process of mixing, stir as needed, and in different stages of mixing, the stirring rate could be the same or different.
In a preferred embodiment of the present invention, the adhesive composition is prepared in the following way: each component of the adhesive composition is added to a mixer, and is mixed for 3 to 10 min under a higher stirring rate of 2000~2400 rpm to obtain the adhesive composition.
In another preferred embodiment of the present invention, the adhesive composition is prepared in the following way: each component of the adhesive composition is added to a mixer, and is mixed for 30 to 100 min under a lower stirring rate of 80~150 rpm to obtain the adhesive composition.
Characteristics of the adhesive composition of the present invention
The adhesive composition of the present invention preferably has a Brookfield viscosity of 100 to 15000 mPa.s at 25°C, more preferably a Brookfield viscosity of 700 to 11000 mPa.s at 25°C, preferably a hardness range of Shore 00 10 to Shore A 40, and a transmittance of preferably more than 90%. Brookfield viscosity (dynamic) was measured with a Brookfield Viscometer Model RVT DV-II (CP52, at 25°C).
Use of the adhesive composition of the present invention
The adhesive composition of the present invention can be used for bonding or laminating various substrates, for example various components in a display, especially in the assembly of optical components, or the bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate. The optically transparent substrates include, for example, glass or optically transparent plastic or the like; the opaque substrates include, for example, metal, opaque plastic, ceramics, stone, leather or wood, etc. Using the adhesive composition of the present invention for bonding or laminating glass substrate-to-glass substrate is the most preferred.
The adhesive composition of the present invention has a novel formulation by introducing the aliphatic polyether urethane oligomer containing (meth)acrylyloxy group preferably with a low Tg and preferably low average functionality, and/or the (meth)acrylate oligomer having preferably a low Tg and preferably low average functionality. The adhesive composition has very good elasticity after being cured which reduces the stress introduced by the bonding between the bonded substrates, and is advantageous for maintaining the bonding strength between the substrates. By comparing with conventional optically clear adhesive tapes, the adhesive compositions of the present invention have the following advantages: 1) having stronger bonding strength; 2) easier in bonding uneven surfaces; 3) convenient for the bonding of rigid-to-rigid substrates. Additionally, the adhesive compositions of the present invention have excellent optically clear properties after cured.
Examples
The present invention is described below in more details by means of examples, but the scope of the present invention is not limited by these Examples.
Materials
Aliphatic polyether urethane oligomer A containing acrylyloxy groups: BR3641AA (Bomar Company), with an average functionality of 1.3, a viscosity of about 24000 mPa.s/50°C, and a Tg of about -50°C;
Aliphatic polyether urethane oligomer B containing acrylyloxy groups: BR3741AB (Bomar Company), with an average functionality of 1.3, a viscosity of about 55000 mPa.s/50°C, and a Tg of about -49°C;
Aliphatic polyether urethane oligomer C containing acrylyloxy groups: Genomer 4188/M22 (Rahn AG Company), with an average functionality of about 1, a viscosity of about 70000 mPa.s/25°C, and a Tg of about -3°C;
Aliphatic polyether urethane oligomer D containing acrylyloxy groups: Genomer3414 (Rahn AG Company, with an average functionality of 4, a viscosity of about 45000 mPa.s/25°C, and a Tg of about -17°C.
Aliphatic polyether urethane oligomer E containing acrylyloxy groups: CN8004 (Sartomer Company), with an average functionality of less than 2, a viscosity of about 9000 mPa.s/60°C, and a Tg of about -3°C.
Acrylate oligomer A: BR344 (Bomar Company), with an average functionality of 2, a viscosity of about 20000 mPa.s/25°C, and a Tg of about -48°C.
Acrylate oligomer B: Genomer6043/M22 (Rahn AG Company), with an average functionality of less than 1, a viscosity of about 40000 mPa.s/25°C, and a Tg of about -18°C.
Polybutadiene A with terminal carboxyl groups: PolyBD3000CT (Cray Valley Company), with a molecular weight of about 3000.
All other chemicals used in the Examples are commercially available and of chemically pure grade.
Test Methods
The viscosity in the present invention is Brookfield viscosity, and is measured under temperatures of 25 °C, 50°C or 60°C respectively according to ASTM D1084.
Brookfield viscosity (Dynamic) in the examples was measured with a Brookfield Viscometer Model RVT DV-II (CP52, 25°C). The shear rate is viscosity-dependent. Adhesive compositions Viscosity (mPa.s) Shear Rate (RPM)
Example 1 3500 15
Example 2 3500 15
Example 3 5500 10
Example 4 11000 2.5
Example 5 2500 20
Example 6 2700 20
Example 7 3000 20
Example 8 700 40
Example 9 1200 30
Example 10 3500 15
Example 11 2500 20
Comparative Example 1 3500 15
The hardness was tested according to ASTM D2240 and Shore 00 hardness and Shore A hardness were measured;
The haze value was tested according to ASTM D1003.
The transmittance was tested according to ASTM E903.
Adhesive curing method before property tests
Curing method for hardness tests:
A polyvinyl chloride film with an average thickness of 0.18 mm is placed on a glass plate of 150mm*150mm*4mm, then a stainless steel frame with a thickness of 2mm is placed thereon and about 30g of the adhesive composition of the present invention are added in, then another polyvinyl chloride film with an average thickness of 0.18 mm is placed on the top and covered with another glass plate of 150mm*150mm*4mm. The sample is put under UV light for two minutes to be sufficiently cured (each side one minute, the UV strength is 100 mW/cm2).
During the hardness test, three pieces of the obtained cured membrane with a thickness of 2 mm are cut in the same size, and then measured with a hardness tester at a thickness of 6 mm.
Curing method for transmittance tests:
On a glass plate of 40mm*60mm* 1.5mm, 0.25 g of the adhesion composition of the present invention is put in the center of the glass plate evenly, the thickness is controlled by using a stainless steel wire, and then covered by another glass plate of 40mm*60mm* 1.5mm. Then the adhesive composition is slightly pressed to flow to form a circle shape, and then sufficiently cured under UV light for one minute (UV light strength is 100 mW/cm ). Example 1
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000014_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive
composition.
Preparation method:
Each component mentioned above (total weight of lOOg) was added to a plastic container of a capacity of 150 g, put into a SpeedMixer™ mixer produced by FlackTech Inc., dispersed and mixed for 4 min under a high stirring rate of 2000~2400 rpm to obtain the adhesive composition.
The obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 50 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 2
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000014_0002
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 60 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 3
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000015_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 5500 mPa.s/25°C, a Shore 00 hardness of ShOO 40 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 4
An adhesive composition was prepared in accordance with the following formulation:
Component (a) 38 parts aliphatic polyether urethane oligomer A containing
acrylyloxy groups
Component (a) 30 parts aliphatic polyether urethane oligomer E containing
acrylyloxy groups
Component (c) 20 parts bicyclopentadieneoxyethyl methacrylate
Component (c) 7 parts isobornyl acrylate Component (d) 1 parts 1-hydroxycyclohexyl benzophenone
Component (e) 3 parts 2-hydroxypropyl methacrylate
Component (e) 1 parts acrylic acid
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 11000 mPa.s/25°C, a Shore 00 hardness of ShOO 70 after being cured, a haze value of <2%, and a transmittance of >98 .
Example 5
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000016_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 2500 mPa.s/25°C, a Shore 00 hardness of ShOO 30 after being cured, a haze value of <0.5 , and a transmittance of >99 .
Example 6
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000016_0002
Component (d) 3 parts 1-hydroxycyclohexyl benzophenone
Component (e) 6 parts 2-hydroxypropyl methacrylate
Component (e) 3 parts acrylic acid
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 2700 mPa.s/25°C, a Shore 00 hardness of ShOO 46 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 7
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000017_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 3000 mPa.s/25°C, a Shore 00 hardness of ShOO 32 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 8
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000017_0002
Component (d) 2.2 parts 1-hydroxycyclohexyl benzophenone
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 700 mPa.s/25°C, a Shore 00 hardness of ShOO 23 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 9
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000018_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 1200 mPa.s/25°C, a Shore 00 hardness of ShOO 40 after being cured, a haze value of <0.5%, and a transmittance of >99 .
Example 10
An adhesive composition was prepared in accordance with the following formulation:
Component (a) 50 parts aliphatic polyether urethane oligomer A containing
acrylyloxy groups
Component (c) 20 parts lauryl acrylate
Component (c) 10 parts bicyclopenteneoxyethyl methacrylate
Component (d) 2 parts 1-hydroxycyclohexyl benzophenone
Component (e) 6 parts 2-hydroxypropyl methacrylate
Component (e) 2 parts acrylic acid Component (f) 10 parts polybutadiene A with terminal carboxyl groups
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of ShOO 50 after being cured, a haze value of <0.5 , and a transmittance of >99 .
Example 11
An adhesive composition was prepared in accordance with the following formulation:
Figure imgf000019_0001
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The preparation method of the adhesive composition was the same as that in Example 1.
The obtained adhesion composition has a viscosity of about 2500 mPa.s/25°C, a Shore 00 hardness of ShOO 25 after being cured, a haze value of <1.0%, and a transmittance of >99 .
Comparative Example 1
An adhesive composition was prepared in accordance with the following formulation:
Component (a) 30 parts aliphatic polyether urethane oligomer D containing
acrylyloxy groups
Component (a) 38 parts aliphatic polyether urethane oligomer E containing
acrylyloxy groups
Component (c) 20 parts lauryl acrylate Component (c) 7 parts isobornyl acrylate
Component (d) 1 parts 1-hydroxycyclohexyl benzophenone
Component (e) 3 parts 2-hydroxypropyl methacrylate
Component (e) 1 part acrylic acid
All the parts are parts by weight based on 100 parts by weight of the adhesive composition.
The obtained adhesion composition has a viscosity of about 3500 mPa.s/25°C, a Shore 00 hardness of Sh00>80 after being cured, a haze value of >5.0%, and a transmittance of<90 .
It can be seen from the above examples and comparative example that the adhesive compositions of the present invention have a hardness from Shore 00 10 to Shore A 40 after being cured, by using the aliphatic polyether urethane oligomers containing (meth)acrylyloxy groups with a low Tg and low functionality, or the acrylate oligomers with a low Tg and low functionality, so that when the adhesive composition is applied between substrates, the stress introduced by the adhesive between the bonded substrates are reduced to remain the bonding between the substrates well; moreover, the adhesive compositions of the present invention have an excellent optical transmittance after cured.
The present invention is described by way of the above specific embodiments, however, it would be obvious for a person skilled in the art to make various modifications and changes without deviating from the spirit of the present invention, and all of those modifications and changes shall be deemed as within the scope of the appended claims.

Claims

What is claimed is:
1. An optically clear liquid adhesive composition, comprising at least one of the following components (a) and (b):
(a) 10 to 80 parts of one or more aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s);
(b) 10 to 80 parts of one or more (meth)acrylate oligomers;
and additionally:
(c) 1 to 42 parts of one or more (meth)acrylate monomers or oligomers without any functional groups;
(d) 0.5 to 5 parts of one or more photoinitiators;
(e) 0 to 30 parts of one or more monomers selected from (meth)acrylamide, (meth)acrylic acid, and (meth)acrylate containing functional group(s); and
(f) 0 to 20 parts of one or more plasticizers, preferably liquid plasticizers; wherein, all the parts are parts by weight and based on 100 parts by weight of the adhesive composition.
2. An optically clear liquid adhesive composition according to claim 1, wherein the average functionality of the (meth)acrylyloxy group of the aliphatic polyether urethane oligomers containing (meth)acrylyloxy group(s) as component (a) is more than 0 and less than or equal to 2, preferably from 0.5 to 1.5; and component (a) has preferably a Tg of from -80 to 0°C, more preferably from -50 to 0°C.
3. An optically clear liquid adhesive composition according to claim 1 or 2, wherein component (a) has a Brookfield viscosity of 5000 to 60000 mPa.s at 50°C, preferably 20000 to 55000 mPa.s at 50°C; or a Brookfield viscosity of 5000 to 50000 mPa.s at 60°C, preferably 9000 to 40000 mPa.s at 60°C ; or a Brookfield viscosity of 10000 to 80000 mPa.s at 25°C, preferably 20000 to 70000 mPa.s at 25°C.
4. An optically clear liquid adhesive composition according to any one of claims 1-3, wherein the average functionality of the (meth)acrylyloxy group of the (meth)acrylate oligomer as component (b) is more than 0 and less than or equal to 2, preferably from 0.5 to 2; and component (b) has preferably a Tg of from -80 to 0°C, preferably from -60 to -10°C.
5. An optically clear liquid adhesive composition according to any one of claims 1-4, wherein the (meth)acrylate oligomer as component (b) has a Brookfield viscosity of 10000 to 50000 mPa.s at 25°C, preferably 20000 to 40000 mPa.s at 25°C.
6. An optically clear liquid adhesive composition according to any one of claims 1-5, wherein the (meth)acrylate monomers without any functional groups as component (c) are selected from alkyl (meth)acrylate, alkenyl (meth)acrylate, heterocyclic (meth)acrylate; wherein, the alkyl group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, and optionally has one or more substituents preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms; the alkenyl group preferably has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms, and optionally has one or more substituents preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms, aryloxy having 6 to 10 carbon atoms and epoxy having 2 to 10 carbon atoms; the heterocyclic group preferably has 1 to 20 carbon atoms, more preferably 1 to 10 carbon atoms, wherein the hetero atom is preferably selected from nitrogen and oxygen, and the heterocyclic group optionally has one or more substituents preferably selected from alkyl having 1 to 10 carbon atoms, alkoxy having 1 to 10 carbon atoms , aryloxy having 6 to 10 carbon atoms, epoxy having 2 to 10 carbon atoms; and component (c) is one or more monomers preferably selected from the above mentioned monomers, or one or more oligomers preferably obtained via the polymerization of a monomer selected from the above mentioned monomers, component (c) has a Brookfield viscosity of less than preferably 1000 mPa.s at 50°C, an weight average molecular weight of preferably less than 2000, and a Tg of from preferably -80 to 100°C.
7. An optically clear liquid adhesive composition according to claim 6, wherein, component (c) is one or more selected from the group consisting of : methyl (meth)acrylate, ethyl (meth)acrylate, mono-acrylate oligomer having a molecular weight of Mw<2000, mono-acrylate oligomer having a molecular weight of Mw<2000 with carbamide or urethane structure, 2-(2-ethoxyethoxy)ethyl acrylate, tetrahydrofuran acrylate, lauryl acrylate, isooctyl acrylate, isodecyl acrylate, 2-ethyl acrylate, 2-phenoxyethyl acrylate, isobornyl (meth)acrylate, dicyclopentenyloxyethyl methacrylate, dicyclopentadienyl methacrylate and the combination thereof.
8. An optically clear liquid adhesive composition according to any one of claims 1-7, wherein the photoinitiator as component (d) is one or more selected from the group consisting of: 2,2-dimethoxy-l,2-diphenylethane-l-one, trimethylbenzoyldiphenyl phosphorus oxide, 1-hydroxycyclohexyl benzophenone, 2-methyl-l-[4-(methylthio)phenyl]-2-morpholine propane-l-one and the combination thereof; among which 2,2-dimethoxy-l,2-diphenylethane-l-one and 1-hydroxycyclohexyl benzophenone are preferred.
9. An optically clear liquid adhesive composition according to any one of claims 1-8, wherein component (e) is one or more monomers selected from: (meth)acrylamide, alkyl substituted (meth)acrylamide, (meth)acrylic acid, and alkyl (meth)acrylate with a functional group selected from a hydroxyl group, an amine group, a carboxy group and the combination thereof, wherein the alkyl group is an aliphatic alkyl having 1 to 20 carbon atoms or an arylalkyl having 6 to 20 carbon atoms.
10. An optically clear liquid adhesive composition according to claim 9, wherein component (e) is selected from (meth)acrylamide, N-ethyl (meth)acrylamide, N-octyl (meth)acrylamide, Ν,Ν-dimethyl (meth)acrylamide, Ν,Ν-diethyl (meth)acrylamide, (meth)acrylic acid, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 2(4)-hydroxybutyl (meth)acrylate and the combination thereof.
11. An optically clear liquid adhesive composition according to any one of claims 1-10, wherein the plasticizer, preferably liquid plasticizer, as component (f) is one or more plasticizers selected from terpine resins with a weight average molecular weight of less than 8000, unsubstituted or carboxy-substituted polyisoprene, polybutadiene or polybutylene rubber with a weight average molecular weight of 1000 to 8000; preferably polybutadiene with terminal carboxyl groups and a weight average molecular weight of 1000 to 8000.
12. An optically clear liquid adhesive composition according to any one of claims 1-11, having a Brookfield viscosity of 100 to 15000 mPa.s at 25°C, preferably 700 to 11000 mPa.s at 25°C, a hardness of Shore 00 10 to Shore A 40 after being cured, and a transmittance of more than 90%.
13. Use of the optically clear liquid adhesive composition according to any one of claims 1-12, for bonding or laminating various substrates, and especially in the assembly of optical components, or the bonding or laminating between optically transparent substrates and between an optically transparent substrate and an opaque substrate.
PCT/CN2012/078825 2011-07-25 2012-07-18 Optically clear liquid adhesive composition and the use thereof WO2013013590A1 (en)

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