CN106753074A - A kind of ultra-violet curable adhesive - Google Patents

A kind of ultra-violet curable adhesive Download PDF

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Publication number
CN106753074A
CN106753074A CN201611096993.2A CN201611096993A CN106753074A CN 106753074 A CN106753074 A CN 106753074A CN 201611096993 A CN201611096993 A CN 201611096993A CN 106753074 A CN106753074 A CN 106753074A
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CN
China
Prior art keywords
ultra
acrylic
curable adhesive
violet curable
ester
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Pending
Application number
CN201611096993.2A
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Chinese (zh)
Inventor
陈佩珊
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Individual
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Individual
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Priority to CN201611096993.2A priority Critical patent/CN106753074A/en
Publication of CN106753074A publication Critical patent/CN106753074A/en
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Classifications

    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • 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
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • 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
    • C09J133/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
    • 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
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

Abstract

The invention provides a kind of ultra-violet curable adhesive, including：Light trigger；The acrylic polymer reacted with derivatization reagent, it includes at least one skeleton hydroxy functional monomers；Base binder, it includes the matrix polymer based on acrylic monomer and optional vinyl monomer；Additive, it includes at least one modified polydialkysiloxane.The mass ratio of the light trigger, acrylic polymer, base binder and additive is 15：3‑5：10‑13：1‑3.

Description

A kind of ultra-violet curable adhesive
Technical field
The present invention relates to adhesive, and in particular to a kind of ultra-violet curable adhesive.
Background technology
PSA based on the solvent typically solids with low-solid content e.g., from about 40%- about 55%.It is coated by solution Method usually limit effective coating thickness of common application, because it is difficult to the evaporation solvent from thick film.However, should for many With, it is necessary to thicker film.PUR provides a kind of approach of easy generation thick film.In history, most of PURs are to be based on Rubber, there is limitation in performance.
UV curable acrylates class hot melt PSA is provided for the potential attractive alternative of PUR based on rubber Case, because lightly crosslinked acrylic adhesives have excellent stripping and shearing property compared with the adhesive based on rubber Energy and significant weather and ageing properties.However, much for the effort on UV curable acrylate classes PSA for thickness The business success of film application has limitation.It is not enough that this is typically due to thicker film curing uniformity on the entire depth of film.
Primary limitations of the PSA curable for UV in some business applications is due to the property of light trigger body.It is right In these binder products, light trigger is incorporated into acrylic by the radical polymerization of acrylate benzophenone In thing skeleton.The amount of the benzophenone of introducing is for about 0.5%- about 1.0%.Benzophenone group is very strong UV absorbents, And it is strong dehydrogenation agent when being excited by UV.Dehydrogenation process causes to produce free radical.When these free radicals in conjunction with when, it is led Cause the lightly crosslinked of polymer.Crosslinking is the key that melting flowable polymer is converted into suitable PSA.However, for There is the limitation in depth in the solidification of the polymer based on benzophenone.Due to strong absorption of the benzophenone at 258nm, at this The UV radiation of individual wavelength can not be by the sample depth more than about 70 μm (about 2.7mils).Therefore, from actual purpose, base Can only be uniform curing on the thickness of 2mils or smaller in the curable PSA of UV of benzophenone.
Other patents in UV curable acrylates class hot melt PSA fields have comprising in light trigger and olefinic component Combination with promote crosslinking adhesive composition.In addition, acrylate-functional polyurethane is molten as the curable warms of UV Melt PSA sales.All these hot melt PSA are 100% solids, do not have VOC (" VOC ") during administration, are exempted from The demand to drying oven and incinerator/hot oxidant is gone.
The content of the invention
It is an object of the invention to provide ultra-violet curable adhesive, its provide the adhesive to composition surface such as base material or Stabilization engagement to carrier.
A kind of ultra-violet curable adhesive that the present invention is provided, including：
Light trigger；
The acrylic polymer reacted with derivatization reagent, it includes at least one skeleton hydroxy functional monomers；
Base binder, it includes the matrix polymer based on acrylic monomer and optional vinyl monomer；
Additive, it includes at least one modified polydialkysiloxane.
Further, the mass ratio of the light trigger, acrylic polymer, base binder and additive is 1-5： 3-5：10-13：1-3.
Further, the derivatization reagent is prepared by hydroxy-functional acrylic ester monomer and diisocyanate.
Further, the hydroxy-functional acrylic ester monomer is selected from HEA, acrylic acid 2- hydroxypropyls Ester, acrylic acid 4- hydroxyls butyl ester, HEMA, methacrylic acid 2- hydroxypropyl esters and caprolactone acrylic acid The combination of one or more in ester；
The diisocyanate is selected from one or more in IPDI and toluene di-isocyanate(TDI) Combination；
Wherein, the hydroxy-functional acrylic ester monomer of the derivatization reagent is 3 to the ratio of diisocyanate:1-5.5: 1。
Further, the modified polydialkysiloxane is the poly- methyl alkyl siloxane that is modified.
Further, the base binder includes based on acrylic monomer and is optionally based on vinyl monomer Base polymer.
Further, the acrylic monomer is selected from acrylic acid, methacrylic acid, butyl acrylate and acrylic acid ethyl Own ester.
Further, also including tackifier and plasticizer.
Further, the tackifier are selected from terpenes phenolic aldehyde, rosin, rosin ester, hydrogenated wood rosin glycerol ester and synthesis hydrocarbon resin The combination of one or more.
Further, the plasticizer is selected from polyglycol ether, PEO, phosphate, alphatic carboxylic acid ester and benzene first The combination of one or more in acid esters.
The derivatization reagent of the invention is by two isocyanic acids with differential responses between two NCOs Ester is obtained so that the reaction with the hydroxy-functional acrylic ester monomer of monovalent mainly produces single-amido acid ester, rather than list The random distribution of carbamate, diurethane and unreacted diisocyanate.Acroleic acid esterification is produced by main Single-amido acid ester and the diisocyanate of little or no residual, be added to hydroxy-functional acrylic and birds of the same feather flock together compound not Obvious molecular weight can be caused to be increased.The isocyanates of residual will be simply added into the alcohol radical in acrylic polymer and produce Raw acrylate-functional acrylic polymer.The acrylic polymer of the acrylate functional can take than benzophenone UV solidifications are carried out on the bigger adhesive films thickness of the curable PSA products of UV in generation.
Additive of the present invention includes at least one modified polydialkysiloxane.Because polydialkysiloxane is used as purple The additive of outer curable adhesive, on the one hand, to the stabilization engagement of base material, and the firm anchoring to carrier can be realized, separately On the one hand, even if increasing the additive does not reduce the adhesive performance or its mechanical performance of base binder yet.Additionally, of the invention Ultra-violet curable adhesive is having high viscosity, confining force high and high bond strength to label paper.Scheme of the invention, Because this extra preliminary step such as silane coupling agent that is obtained without need for for being adhesively bonded or anchoring is coated with or physical surface treatment, example Such as sided corona treatment so that the formation of stabilization engagement is more easy.
Specific embodiment
In one embodiment, hydroxy-functionalized polymer is generally the acrylic acid of molecular weight for about 40000- about 100000 Birds of the same feather flock together compound.Can be used for acrylic monomer of the invention includes substantial amounts of generation lower glass transition temperatures (Tg) polymer Monomer.Such monomer includes being selected from 2-ethylhexyl acrylate, iso-octyl acrylate, Isodecyl base ester, propylene Those of sour Lauryl Ester, n-butyl acrylate etc. and combinations thereof.
Acrylic polymer may also include the monomer for changing Tg, such as be selected from methyl acrylate, ethyl acrylate, methyl-prop Those of e pioic acid methyl ester, styrene, vinyl acetate and combinations thereof.For using isocyanates derivatization, it is necessary to by least one Hydroxy functional monomers are attached in the skeleton of acrylic polymer.Using Fox equatioies, the propylene before derivatization and UV solidifications The Tg of the calculating of acids polymers should be for about in theory -35 DEG C to about -50 DEG C, preferably from about -40 DEG C to about -45 DEG C.These hydroxyls The hydroxy functional monomers of base functional monomer, skeleton hydroxy functional monomers and derivatization reagent are different, the derivatization reagents Hydroxy functional monomers be reagent hydroxy functional monomers.Can be coupled to the hydroxy functional monomers in the skeleton of acrylic polymer Example include：HEA, HEMA, acrylic acid 2- hydroxypropyl esters, methacrylic acid 2- hydroxypropyl esters, acrylic acid 4- hydroxyl butyl esters etc. and combinations thereof.The acrylic polymer can also include other functional monomers To improve adhesion property, acrylic acid, methacrylic acid, maleic anhydride, GMA, N- second are selected from Those of vinyl pyrrolidone, N- caprolactams and acrylamide and combinations thereof.
Prepare derivatization reagent and cause the most of molecules in adduct, if not all of molecule, will be comprising extremely Few about reactive isocyanate group, the most of molecules in derivatization reagent are comprising one in one embodiment Reactive isocyanate group.The isocyanate groups form carbamate with the hydroxyl reaction in acrylic polymer Be connected to acrylic double bond on acrylic polymer by key, the key.The connection causes acrylic polymer to free radical Polymerisation has reactivity.
Derivatization reagent is prepared by diisocyanate and hydroxy-functional acrylic ester monomer, reagent hydroxy functional monomers.Two Isocyanates generally has different reactivity between two isocyanate groups so that only one of which isocyanates can be preferential Reacted with the hydroxy-functional acrylic ester monomer of derivatization reagent, after another isocyanates is remained and acrylic polymer Reaction.Can be used for diisocyanate of the invention includes IPDI, toluene di-isocyanate(TDI) etc. and combinations thereof. Hydroxy-functional acrylic ester monomer in derivatization reagent may be selected from HEA, acrylic acid 2- hydroxypropyl esters, Acrylic acid 4- hydroxyls butyl ester, HEMA, methacrylic acid 2- hydroxypropyl esters etc. and combinations thereof.Also can be used The hydroxy-acrylate monomer of special hydroxy-functional acrylic ester such as caprolactone acrylate.
At least one modified polydialkysiloxane has the side chain comprising polar group as its modifying moieties.This Sample, obtains improved compatibility and high bond strength of the ultra-violet curable adhesive to polar surfaces, therefore obtain ultraviolet consolidating Change stabilization engagement of the adhesive to polarity composition surface.
If the modified polydialkysiloxane is modified poly- methyl alkyl siloxane or even modified polydimethyl silica It is favourable if alkane.One of its effect is to ensure that additive is embedded into adhesive well.The class of alkyl used by addition Type is in all cases depending on the concrete composition of adhesive.
Base binder includes the base polymer for being based on acrylic monomer and being optionally based on vinyl monomer Words are favourable.Particularly preferred acrylic monomer is selected from acrylic acid, methacrylic acid, butyl acrylate and acrylic acid second Those monomers of the own ester of base.This kind of base binder is particularly suitable for bonding and being adapted for anchoring on paper carrier with paper, special It is not art paper (coatedpaper) those carriers.Therefore, ultra-violet curable adhesive of the invention specifically ensures that and paper is engaged Effective engagement on surface and ensure simultaneously the adhesive protrude repulping (depulpability).
Compared with unmodified polydialkysiloxane, in modified polydialkysiloxane, some unmodified subelements The subelement that is modified is replaced, so that the polydialkysiloxane is also comprising modified subelement in addition to unmodified subelement.
The modified subelement is with the difference of unmodified subelement, one of described alkyl, A1 or A2, Huo Zheshi Both side bases that is modified are replaced on border.Therefore this modified subelement UM have formula-[- Si (A3) (M)-O-]-, M is Modified side base and A3 are the alkyl to type described in alkyl A1 and A2, and it can be identical with one or both of alkyl A1 and A2 or not Together.Usual A3 is methyl.
As modified side chain M, it is possible to use all suitable side chain of nonpolar and polarity.Available non-polar sidechain It is all suitable non-polar groups.Suitable alkyl includes all saturated or unsaturated, nonbranched or branched, warps Substituted or unsubstituted alkyl, such as those with 1-30 carbon atom, typically C1-C3 alkyl.
As modified side chain M, polar side chain can be alternatively used.As polar side chain, it is possible to use Suo Youji Property functionalization side chain, example be contain one or more carboxyls, sulfonic acid, phosphonic acids, hydroxyl, lactams, lactone, N- substitution acyl Those side chains of amine, N- substitutions amine, carbamate, epoxy, mercaptan, alkoxy, cyano group, halogen or ether group.Suitable side Chain including replaced by polar group alkyl or polyester, polyethers, polythiaether, etc. polyamide.
Acrylic monomer includes that its structure can be derived from the structure of unsubstituted or substituted acrylic or methacrylic acid Or ester derived from those compounds and all compounds that can be described by formula CH2=C (R1) (COOR2), wherein Group R1 can be that hydrogen atom or methyl and group R2 can be hydrogen atom or select self-saturating, nonbranched or branched , substituted or unsubstituted C1-C30 alkyl.The polymer of the base binder of the ultra-violet curable adhesive preferably has There is the acrylic monomer content of 50wt% or bigger.
As acrylic monomer, however, it would be possible to use all of above-mentioned these compounds, by intended application field Specific requirement controls its specific selection and its ratio.
Thus as acrylic monomer, it is also possible to for example using group R2 be carried out as follows selection those acrylate and Methacrylate, wherein R2 select self-saturating, nonbranched or branched, substituted or unsubstituted C4-C14 alkyl, more Especially C4-C9 alkyl.It is not intended to be exemplified below limitation ground, instantiation is methyl acrylate, methyl methacrylate, third Olefin(e) acid ethyl ester, n-butyl acrylate, n-BMA, acrylic acid n-pentyl ester, the just own ester of acrylic acid, acrylic acid positive heptan The positive nonyl ester of ester, n-octyl, n octyl methacrylate, acrylic acid, lauryl acrylate, stearyl acrylate ester, propylene Sour behenyl ester, and its branched isomer, such as isobutyl acrylate, 2-EHA, methacrylic acid 2- ethyl hexyls Ester, Isooctyl acrylate monomer, EHMA, also cyclohexyl acrylate, isobornyl acrylate, methacrylic acid are different Norbornene ester or acrylic acid 3,5- dimethyladamantane base esters.
As adhesive component, can for example using comprising at least one acrylic monomer and at least one comonomer Polymer, wherein R2 selects self-saturating, nonbranched or branched, be substituted or unsubstituted C2-C20 alkyl, described Comonomer can with least one acrylic monomer copolymerization and can be especially selected from the vinylated of functional group Compound, maleic anhydride, styrene, distyryl compound, vinyl acetate, acrylamide or with the light-initiated of double bond functionalization Agent.The ratio of these compositions can be changed with wide scope.For example in the polymer of described base binder acrylic monomer can be with Account for the mass fraction of 65-100wt% and at least one comonomer accounts for the mass fraction of 0-35wt%.
The comonomer that can be used in this respect includes all suitable above-claimed cpds, such as with one or more Those compounds of substitution base, more particularly polar substituent, the substitution base such as carboxyl, sulfonic acid, phosphonic acids, hydroxyl, interior acyl Amine, lactone, N substituted amide, N- substitutions amine, carbamate, epoxy, mercaptan, alkoxy, cyano group, halogen and ether group.
Can be added in acrylic pressure-sensitive adhesive in adhesive process for preparation weight portion be 5-15 tackifier and Weight portion is the plasticizer of 5-15.The tackifier are selected from terpenes phenolic aldehyde, rosin, rosin ester, hydrogenated wood rosin glycerol ester and synthesis hydrocarbon tree The combination of one or more in fat.Plasticizer can before polymerization or follow closely polymerization after, in acrylic copolymer or ternary Add plasticizer in copolymer solution, during plasticizer can also be admixed to the melt of melt acrylic PSA in coating, can be with It is added in the monomer slurry of the acrylate PSA of uv photopolymerization or thermal polymerization, or is added to water base acrylate PSA breasts In shape liquid.
Preferred plasticizer can be dissolved in any solvent of presence with acrylate PSA or its solution therewith, be applied in hot melt In be heat-staple, substantially without interference with polymerisation or cross-linking process, and can be with the propylene in water base adhesive formula Acid esters PSA forms the emulsion of stabilization together.Add tackifier and specific plasticizer to reach to improve to low-energy surface (such as High density polyethylene (HDPE)) peel adhesion, without infringement in bonding strength.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple of the invention and show Example property embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure It is determined that or deriving many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognizes It is set to and covers all these other variations or modifications.

Claims (10)

1. a kind of ultra-violet curable adhesive, it is characterised in that including：
Light trigger；
The acrylic polymer reacted with derivatization reagent, it includes at least one skeleton hydroxy functional monomers；
Base binder；
Additive, it includes at least one modified polydialkysiloxane.
2. ultra-violet curable adhesive according to claim 1, it is characterised in that the light trigger, acrylic polymer The mass ratio of compound, base binder and additive is 1-5：3-5：10-13：1-3.
3. ultra-violet curable adhesive according to claim 2, it is characterised in that the derivatization reagent is by hydroxyl-functional It is prepared by acrylate monomer and diisocyanate.
4. ultra-violet curable adhesive according to claim 3, it is characterised in that the hydroxy-functional acrylic ester monomer Selected from HEA, acrylic acid 2- hydroxypropyl esters, acrylic acid 4- hydroxyls butyl ester, HEMA, The combination of one or more in methacrylic acid 2- hydroxypropyl esters and caprolactone acrylate；
The diisocyanate is selected from the combination of one or more in IPDI and toluene di-isocyanate(TDI)；
Wherein, the hydroxy-functional acrylic ester monomer of the derivatization reagent is 3 to the ratio of diisocyanate:1-5.5:1.
5. the ultra-violet curable adhesive according to any one of claim 1-4, it is characterised in that the poly- dioxane that is modified Radical siloxane is the poly- methyl alkyl siloxane that is modified.
6. the ultra-violet curable adhesive of claim 5, it is characterised in that the base binder includes being based on acrylic compounds list Body and it is optionally based on the base polymer of vinyl monomer.
7. the ultra-violet curable adhesive of claim 6, it is characterised in that the acrylic monomer is selected from acrylic acid, methyl Acrylic acid, butyl acrylate and EHA.
8. the ultra-violet curable adhesive of claim 7, it is characterised in that also including tackifier and plasticizer.
9. the ultra-violet curable adhesive of claim 8, it is characterised in that the tackifier are selected from terpenes phenolic aldehyde, rosin, rosin The combination of one or more in ester, hydrogenated wood rosin glycerol ester and synthesis hydrocarbon resin.
10. the ultra-violet curable adhesive described in claim 9, it is characterised in that the plasticizer is selected from polyglycol ether, poly- The combination of one or more in oxirane, phosphate, alphatic carboxylic acid ester and benzoic ether.
CN201611096993.2A 2016-12-02 2016-12-02 A kind of ultra-violet curable adhesive Pending CN106753074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611096993.2A CN106753074A (en) 2016-12-02 2016-12-02 A kind of ultra-violet curable adhesive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611096993.2A CN106753074A (en) 2016-12-02 2016-12-02 A kind of ultra-violet curable adhesive

Publications (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110484201A (en) * 2019-09-30 2019-11-22 杭州奥方科技有限公司 A kind of method UV cured silicon class glue and manufacture sealing ring using it
CN114350298A (en) * 2022-01-13 2022-04-15 中国乐凯集团有限公司 Polyurethane adhesive and application thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110484201A (en) * 2019-09-30 2019-11-22 杭州奥方科技有限公司 A kind of method UV cured silicon class glue and manufacture sealing ring using it
CN114350298A (en) * 2022-01-13 2022-04-15 中国乐凯集团有限公司 Polyurethane adhesive and application thereof
CN114350298B (en) * 2022-01-13 2023-11-24 中国乐凯集团有限公司 Polyurethane binder and application thereof

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