CN1566244A - UV photo-curing adhesive for lamination of polarizer sheet protective membrane - Google Patents

UV photo-curing adhesive for lamination of polarizer sheet protective membrane Download PDF

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CN1566244A
CN1566244A CN 03148316 CN03148316A CN1566244A CN 1566244 A CN1566244 A CN 1566244A CN 03148316 CN03148316 CN 03148316 CN 03148316 A CN03148316 A CN 03148316A CN 1566244 A CN1566244 A CN 1566244A
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laminated
polarizing plate
protective film
curable adhesive
plate protective
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CN1290953C (en
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秦长喜
刘瀛
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China Lucky Group Corp
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China Lucky Film Group Corp
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Abstract

The invention relates to a UV optical solidifying adhesive agent, in particular a UV photo-curing adhesive for lamination of polarizer sheet protective membrane, which comprises prepolymer, reactive monomer, photo-initiation agent, and auxiliary agent.

Description

A kind of laminated UV curable adhesive of polarizing plate protective film that is used for
Technical field
The present invention relates to a kind of UV curable adhesive, particularly a kind of laminated UV curable adhesive of polarizing plate protective film that is used for.
Technical background
Polaroid is the important component part in the liquid-crystal display, and liquid-crystal display (LCD) has been widely used in portable computer, counter, clock and watch, lcd color tv, digital indicator, self-reacting device equipment, opticinstrument, antihalation glass, electronic bill-board etc. at present.Typical liquid crystal comprises that three key components promptly import polarizer, liquid crystal cell and output polarizer, and control is by the brightness of the polarisation of light degree liquid crystal cell control indicating meter of output polarizer.
The effect of polaroid is the character that changes light.Natural light is a ripple in length and breadth, and when natural light during by polaroid, polaroid absorbs the light of a certain direction vibration, and allows the light of other direction vibration pass through, and the light that sees through is polarized light.Polaroid is a kind of optically functional film, and it comprises: (1) polarizing coating, (2) inner protection film, (3) polarizing coating and inner protection film adherent lamination glue-line, (4) outer protective membrane, (5) pressure-sensitive adhesive layer, (6) release film.
The base mateiral of polarizing coating is at present widely used to be the PVA film, the good transparency that the PVA film is had, water tolerance and preferably tensile property be very suitable for the preparation of polarizing coating, but the outstanding shortcoming of himself is wet-hot aging performance and bad mechanical strength.In order to make liquid crystal display material adapt to conditions such as hot and humid, someone uses the PVA film of some modifications or other mould material such as ethene-polyvinyl alcohol copolymer, vinyl-acetic ester in research polymkeric substance, vinyl-acetic ester and other monomeric multipolymer, modified PETs etc. are with the alternative PVA film of thermoplastic resin, improve the wet-hot aging performance of polaroid, but industrialization product still is a PVA (PVOH) FILM at present.The PVA film is through iodine or dichroic dye is painted and orientation stretching is made polarizing coating, and iodine is also to be present most popular dichroic substance the earliest, and other dyestuff such as azoic dyestuff, anthraquinone dye, tetrazine dyestuff etc. also have the research report.
The inner protection film of polaroid is in order to ensure the physical strength of polarizing coating and work-ing life, and inner protection film is fitted in the polarizing coating both sides by tackiness agent.Require to have the transmitance height of light as the polymeric membrane of protection usefulness, reflection loss is little, for the variation of environment advantages of higher stability is arranged, film is inner and surperficial zero defect, optical isotropy and can mix up necessary protective material such as uv-absorbing agent etc. at inner protection film for the weathering resistance that improves polaroid.The material that is used for inner protection film generally is an especially three cellulose acetate membrane (TAC) of cellulose acetate membrane; for overcoming the insufficient problem of TAC film mechanical property and weather resisteant; some polymeric membranes such as polyester, polycarbonate, polypropylene acid esters, polyimide, polyolefin resin are used to the existing report of inner protection film of polarizing coating, but are used for the also three cellulose acetate membrane (TAC) just of polaroid actual production at present.The applying of inner protection film and polarizing coating is finished with laminating adhesive; because laminating adhesive is used in the middle of the polaroid, so except that need have certain bonding force, also must have the character that does not influence optical property; greater than 92%, distortion etc. can not take place by glue-line in light as transmitance.
Outer protective membrane is from sticking at the outer surface protection film of polaroid one side inner protection film, and effect is for avoiding in processing, handling process pollution and the scuffing to the polaroid surface.Produce the opposite side coating pressure sensitive adhesive of polaroid for the ease of liquid crystal, the outer applying one deck of glue-line barrier film was peeled off it before polaroid fits in liquid crystal cell and is removed.
Because the purposes and the consumption of liquid-crystal display enlarge year by year, the environment for use of liquid-crystal display also has huge difference, feasible weather resisteant to polaroid requires more and more higher, and polaroid needs good security and reliability when especially using in hot and humid environment.Except that polarizing coating self, inner protection film and tackiness agent also are the key factors that improves the polaroid weather resisteant, and the type of tackiness agent also has considerable influence to polaroid quality and production efficiency simultaneously.Tackiness agent must have adhesiveproperties preferably, also higher transmittance and weather resisteant must be arranged, and the every performance of the adhesive layer that forms after the tackiness agent drying is close with propping material.PVA class tackiness agent is the actual at present tackiness agent that adopts; PVA tackiness agent and polarizing coating and inner protection film have stronger avidity; bonding strength is big; the optics same sex in the glue-line; the visible light transmissivity height; toxicity is low, meets the requirement of polaroid to tackiness agent, especially is fit to the bonding of PVA polarizing coating and TAC inner protection film.But this type of tackiness agent exists many defectives such as ageing resistance poor, especially causes bonding force to descend in the easy moisture absorption of hot and humid environment lower glue layer, thereby polarizing coating generation disorientation and dye density reduce and cause degree of polarization to reduce, and serious meeting causes drawing up; The PVA tackiness agent is a water-soluble binder, compound tense at polarizing coating and TAC needs comparatively high temps and long drying just can finish bonding, dry channel is long in the adhesion technique requirement production unit, energy input height, and the yielding finished product rate that influences of polarizing coating in the composite drying process; Make production rate slower long time of drying, and production efficiency is lower; The PVA tackiness agent also has limitation to polarizing coating and other polymer (as polyester) film bonding.
For addressing the aforementioned drawbacks, the research to polaroid mainly is to carry out a large amount of work aspect the weather resisteant that improves polaroid and the field of use in recent years.The research of polaroid inner protection film and composite adhesive is also more.As U.S. Pat 4,774,141 disclose a kind of painted polaroid of azoic dyestuff of using, the one side of this polyvinyl alcohol polarizing coating is bonding transparent polysulfones conducting film, the laminating adhesive type of polysulfones conducting film and polyvinyl alcohol polarizing coating can be selected thermohardening type for use, radiation-curable, pressure-sensitive adhesive type and X-ray or electronic beam solidified as the PVA tackiness agent, urethane resin, Resins, epoxy, tackiness agent such as silicone resin and synthetic rubber, the composition of UV cured resin tackiness agent can be by urethane acrylic acid ester, epoxy acrylic acid ester and light trigger are formed, but the another side adherent TAC protective membrane of polarizing coating still is to use the PVA tackiness agent; U.S. Pat 5,738,918 disclose a kind of painted macromolecule polyester liquid crystal material of dichroic dye of using, introduce the laminating adhesive type in the patent and can select thermohardening type, radiation-curable, pressure-sensitive adhesive type and X-ray or electronic beam solidified tackiness agent for use, but the radiation curing laminating adhesive is not further described; U.S. Pat 2003001988 discloses that inner protection film can be the membrane product of TAC or polyester, polyimide and polyolefin resin in the painted polaroid of iodine, and the tackiness agent that is fit to paste mainly is water-soluble binders such as poly (vinyl alcohol) binder, acrylic acid class tackiness agent, polyester isocyanate tackiness agent; U.S. Pat 2003030906 discloses that the PVA resin can be the multipolymer of saponified polyvinyl acetate (PVA) (polyvinyl alcohol) or vinyl acetate and other copolymerisable monomer in the painted polaroid of iodine; for avoiding the difficulty of zinc ion concentration control in the coloring solution; and zinc salt is added in the transparent PVA tackiness agent; inner protection film is TAC, must be dry under 70 ℃ of conditions when bonding.
By as seen aforementioned, research with tackiness agent is deepening continuously to polaroid, except that PVA tackiness agent commonly used research improves, the tackiness agent of other type such as thermohardening type, radiation-curable, pressure-sensitive adhesive type and X-ray or electronic beam solidified tackiness agent extensively cause the concern and the research of polaroid industry, and its purpose is exactly in order to improve the application adaptability of polaroid.
The UV radiation curing technology has obtained fast development in recent years, has been widely used in coating, printing-ink and tackiness agent and other electronic product fields.The UV cure adhesive can be used for the bonding of laminate adhesive, pressure sensitive adhesive and multiple material, the advantage of UV cure adhesive is that the tackiness agent of preparing as required has very high transmitance, reliability and excellent waterproofness under the excellent hot and humid environment, UV cure adhesive 100% film-forming, solvent-free volatilization pollution problem, curing speed is fast, save the energy and production efficiency height.
The existing in recent years a lot of research reports of UV cure adhesive, for example, the UV that is used for production safety glass solidifies open introduce (" bonding " 2002.5) of laminating adhesive; Chinese patent CN1199075 discloses a kind of UV cure adhesive that can be used for non-metallic material such as glass, can be used for sealing of liquid crystal board; TW387007 discloses a kind of composition and application of Photocurable adhesive; Chinese patent CN97105862 discloses a kind of Photocurable adhesive, and its component is made up of or the like elastomerics epoxy acrylic acid resin, different functional groups acrylic acid thinner, light trigger and auxiliary agent.The UV cure adhesive has become tackiness agent kind with fastest developing speed in recent years at present, can satisfy the bonding needs of many materials as extraordinary tackiness agent.Therefore, can solve the defective that the PVA tackiness agent exists with UV curing bonding PVA polarizing coating of laminating adhesive and TAC inner protection film.
Summary of the invention
The purpose of this invention is to provide a kind of laminated UV curable adhesive of polarizing plate protective film that is used for; especially polarizing coating and inner protection film adherent UV cure adhesive; UV cure adhesive provided by the invention has the reliable and stable characteristics of adhesiveproperties in the high-temp resisting high-humidity resisting environment, has weather resisteant preferably by its adherent polaroid applicable to different environment.
Technical scheme of the present invention is:
A kind of laminated UV curable adhesive of polarizing plate protective film that is used for, it comprises: (1) prepolymer; (2) reactive monomer; (3) light trigger; (4) auxiliary agent, its each component concentration is (weight percent):
Prepolymer 10~70%;
Reactive monomer 20~80%;
Light trigger 1~10%;
Auxiliary agent 0~10%.
A kind of preferred version, wherein said each components contents that is used for the laminated UV curable adhesive of polarizing plate protective film is:
Prepolymer 30~60%;
Reactive monomer 32~68%;
Light trigger 2~5%;
Auxiliary agent 0~3%.
A kind of preferred version, wherein said prepolymer are epoxy acrylate, urethane acrylate, polyester acrylate or polyolefin acrylate, preferred EA205, EA210, CN118, CN962, CN966J75,6134A-80, CN301 or CN302.
A kind of preferred version, wherein said reactive monomer is a simple function group, the acrylate of bifunctional or many bifunctionals, preferred 2-ethylhexyl acrylic acid ester, phenoxy group ethyl acrylic acid ester, NONYL PHENOL ETHOXYLATED acrylic acid ester, the butyleneglycol dipropyl dilute acid ester, polyoxyethylene glycol (600) dipropyl dilute acid ester, ethoxylated bisphenol A dipropyl dilute acid ester (Sartomer Co.CD541), trimethylolpropane tris acrylic acid ester, tetramethylolmethane three acrylic acid esters, two seasons penta 6 pure five acrylic acid esters, PHOTOMER4039 (the single acrylic acid ester of phenolic group oxyethyl group 3EO), CD9050 (simple function group acrylic acid ester) or CD9051 (trifunctional acid ester).
A kind of preferred version, wherein said light trigger are radical photoinitiator, preferred Irgacure 184, Darocure 1173, Irgacure 907 or TPO.
A kind of preferred version, wherein said auxiliary agent comprises curing reaction promotor, bounding force promotor and defoamer, wherein, the preferred P115 of curing reaction promotor or 7100; The preferred TriMethylolPropane(TMP) of adhesion promotor; Defoamer preferred solvent type defoamer 3100.
UV cure adhesive of the present invention is made up of prepolymer, reactive monomer, light trigger and auxiliary agent.Prepolymer is the most critical component of radiation-curing binders, according to the difference of bonding base material can select dissimilar prepolymers, or the combination of different prepolymers, the essential property of the kind of prepolymer, functionality and molecular weight decision maker tackiness agent is as toughness, plasticity-, cure shrinkage and adhesiveproperties.Prepolymer among the present invention can be epoxy acrylic acid ester, urethane acrylic acid ester, polyester acrylic acid ester or polyolefin acrylic acid ester.Generally selecting functionality among the present invention for use is about 2 and the bigger prepolymer of molecular weight, and the solidify reaction process shrinking percentage of these prepolymers is lower, and is good with the adhesivity of base material.Some contain the bonding strength that prepolymer that sticking power promotes the functional groups modification can improve tackiness agent, as the epoxy acrylic acid ester of this property of acid or this property of polyvalent alcohol etc.The commercial prod of these prepolymers has EA205, EA210, the EA215 of epoxy acrylic acid ester as modern mountain range: Shaanxi photo-curing material company, the CN117 of Sartomer company, CN118 etc.; Aliphatic polyurethane acrylic acid ester is as the PHOTOMER6230 of CN962, the CN964E75 of the 6134A-80 of Changxing chemical company, 615-100,6141H-80, Sartomer company, CN966J75 and Kening Co.,Ltd of Henkel group (cognis) etc.; Polyolefin acrylic acid ester is as the CN301 of Sartomer company, CN302, Ricacryl3801 etc.Preferred EA205, EA210, CN118, CN962, CN966J75,6134A-80, CN301 or CN302.
The effect of reactive monomer in radiation-curing binders is regulation system viscosity, enhancement tackiness agent and the various performances of being solidified the front and back material by the wettability of bonding substrate surface, improvement curing speed and improvement, as snappiness, hardness or the like.Among the present invention, reactive monomer is simple function group, bifunctional or multi-functional acrylic acid ester.The simple function group acrylic acid ester monomer that contains functional group can be used as bounding force promotor in radiation-curing binders; Polyfunctional group acrylic acid ester monomer can improve adhesiveproperties by the curing cross-linked density of adhesive composition.Hydrophilic or the hydrophobic performance of reactive monomer has considerable influence to the erosion of institute's adhesive substrate, and reactive monomer will determine the performance of tackiness agent, as the physicals of curing speed, viscosity, bonding strength, wetting property, toxicity and other tackiness agent self.Be applicable to that reactive monomer of the present invention can be: simple function group acrylic acid ester such as the own propyl group diluted acid of 2-ethyl ester (2-EHA), positive certain herbaceous plants with big flowers base acrylic acid ester, isobornyl acrylic acid ester, phenoxy group ethyl acrylic acid ester, NONYL PHENOL ETHOXYLATED acrylic acid ester etc.; Bifunctional acrylic acid ester such as ethylene glycol dipropyl dilute acid ester, butyleneglycol dipropyl dilute acid ester (BDDA), hexylene glycol dipropyl dilute acid ester (HDDA), tetraethylene-glycol dipropyl dilute acid ester (TEGDA), tripropylene glycol dipropyl dilute acid ester (TPGDA), polyoxyethylene glycol (600) dipropyl dilute acid ester, ethoxylated bisphenol A dipropyl dilute acid ester (Sartomer Co.CD541) etc.; Polyfunctional group acrylic acid ester such as trimethylolpropane tris acrylic acid ester (TMPTA), tetramethylolmethane three acrylic acid esters (PETA), two seasons penta 6 pure five acrylic acid esters etc. and the PHOTOMER4039 (the single acrylic acid ester of phenolic group oxyethyl group 3EO) of some commercial specific functional groups acrylic acid esters such as Kening Co.,Ltd of Henkel group (cognis), HOTOMER6171 (acid functional group list acid esters), the CD9050 of Sartomer company (simple function group acrylic acid ester), CD9051 (trifunctional acid ester), CD9012 (trifunctional acrylic acid ester) etc.The preferred own propyl group diluted acid of 2-ethyl ester, phenoxy group ethyl acrylic acid ester, NONYL PHENOL ETHOXYLATED acrylic acid ester, the butyleneglycol dipropyl dilute acid ester, polyoxyethylene glycol (600) dipropyl dilute acid ester, ethoxylated bisphenol A dipropyl dilute acid ester (Sartomer Co.CD541), trimethylolpropane tris acrylic acid ester, tetramethylolmethane three acrylic acid esters, two seasons penta 6 pure five acrylic acid esters, PHOTOMER4039 (the single acrylic acid ester of phenolic group oxyethyl group 3EO), CD9050 (simple function group acrylic acid ester) or CD9012 (trifunctional acrylic acid ester).
The light trigger that the present invention selects for use is a radical photoinitiator; it can be: the st-yrax methyl ether (trade name Irgacure 651) that contracts; 1-hydroxy-cyclohexyl phenyl ketone (the trade name Irgacure of CIBA-GEIGY company 184); 2-hydroxy-2-methyl-1-phenyl-1-acetone (trade name Darocure 1173); 2-methyl isophthalic acid-(4-methylthio group phenyl)-2-morpholine-1-acetone (the trade name Irgacure of CIBA-GEIGY company 907); 2; 4; 6-trimethylbenzoyl-diphenyl phosphine oxide (the trade name TPO of CIBA-GEIGY company) etc., preferred Irgacure 184; Irgacure 907; Darocure 1173 or TPO.Light trigger may be used alone, can also be used in combination, main curing speed, inner protection film thickness and face decision as requested.
The auxiliary agent that the present invention uses is to add for the laser curing velocity that solves the UV cure adhesive, promotion bounding force reach problems such as in use removing bubble.Auxiliary agent among the present invention comprises curing reaction promotor, bounding force promotor or defoamer.Curing reaction promotor can be trolamine, 4-mesitylenic acid ethyl ester or response type tertiary amine such as the P115 of UCB. S.A. (BE) Bruxelles Belgium or 7100 etc., preferred P115 or 7100; Adhesion promotor can be selected TriMethylolPropane(TMP), hexan-hexol, tetramethylolmethane, Dipentaerythritol four acrylic acid esters etc. for use, preferred TriMethylolPropane(TMP); Defoamer can be the solvent-borne type defoamer 2700 or 3100 of the modest enterprise stock of moral company, the deaerating agent Airex900 of Di Gao chemical company or Airex920 etc., preferred solvent type defoamer 3100.
The process for preparation of UV cure adhesive of the present invention is: add light trigger and reactive monomer in stainless steel cask, stirring and dissolving adds prepolymer and auxiliary agent, adds defoamer after the stirring and dissolving, and mixing and stirring promptly obtains the UV cure adhesive.
UV cure adhesive of the present invention solidifies dry in the several seconds at room temperature, can shorten the dry channel of equipment, reduces energy consumption greatly, and yield rate improves, and is more suitable for enhancing productivity in serialization production.
Embodiment
By following examples the present invention is further specified, but the present invention is not limited by following examples.
Embodiment 1
Prescription 1:
Acid modified epoxy acrylic ester (CN118 of Sartomer company) 18
Aliphatic urethane acrylate (6143A-80 of Changxing chemical industrial company) 25
NONYL PHENOL ETHOXYLATED acrylate (CD612 of Sartomer company) 10
Simple function group acrylic acid ester (CD9050 of Sartomer company) 12
Trifunctional acid ester (CD9051 of Sartomer company) 14
Butylene glycol diacrylate 15
Irgacure 184 (CIBA company) 2
Irgacure 907 (CIBA company) 1
Response type tertiary amine compound (P115 of UCB. S.A. (BE) Bruxelles Belgium) 2
TriMethylolPropane(TMP) 0.7
Solvent-borne type defoamer (Deuchem Co., Ltd. 3100) 0.3
Add the solid light trigger in stainless steel cask, add reactive monomer, stirring and dissolving adds the defoamer mixing and stirring and promptly obtains the UV cure adhesive after adding prepolymer and the auxiliary agent stirring and dissolving, stand-by.
PVA film balance in the environment of relative humidity about 80% that curtain coating is made, invaded then in the dyeing solution be added with iodine and stablizer zinc chloride painted 3 minutes, the water flushing removes removal floating color, in stationary liquid, soaked about 3 minutes, washing back 30 ℃, relative humidity 75% left and right sides environment is drop-down stretches 4.5 times, drying is 30 minutes under 90 ℃, obtains optically active polaroid functional membrane.
Polarizing coating and TAC's is compound: TAC (80 μ m) film and the polarizing coating handled through saponification are overlapped into the pre-composite sheet of TAC/ polarizing coating/TAC, be placed between the composite roll of compounding machine, in the middle of TAC film and polarizing coating, clamp-on the above-mentioned UV cure adhesive that obtains, the starting compounding machine, the film close combination extruded and makes by tackiness agent excessive between two films by nip drum, applications as laminates UV curing apparatus exposure is immediately solidified condition of cure: 80w/cm high voltage mercury lamp, room temperature irradiation 6 seconds; Applications as laminates 100 ℃ of thermal treatments 3 minutes, has promptly obtained the polaroid of inner protection film compound behind the UV photoirradiation.
Last outside a side applying PE-EVA of inner protection film protective membrane, opposite side pressure-sensitive adhesive coating and composite isolated film promptly obtain polaroid.Carry out Performance Detection then, during its test result sees Table.
Performance Detection:
(1) transmitance of binder layer: available uv-vis spectra detects, (80 μ m) is placed between the composite roll of compounding machine with two TAC films, clamp-on tackiness agent between two films, the starting compounding machine, excessive tackiness agent extrudes and makes film close in conjunction with (binder layer thickness≤2 μ m) between two films by pressure roller, tests transmitance with spectrophotometer behind the dry solidification.
(2) adhesiveproperties: the stripping strength by tests polarization film and TAC protective membrane detects, and the polarizing coating that pastes is tested its stripping strength with omnipotent puller system.Measuring method is with reference to GB/T2790-1995,180 ° of peeling strength test methods of tackiness agent, and flexible material is to rigid material.
(3) weather resisteant detects: the polaroid that assembles is cut into 50mm * 50mm several piece be placed in the climatic chamber of 40~42 ℃ of relative humidity 90~95% of temperature aging 1000 hours, the degree of polarization and the transmitance of test polaroid also observed situation such as bonding cracking.
Embodiment 2
Make optically active PVA polaroid functional membrane by embodiment 1 with quadrat method, make inner protection film with the TAC film, complex method is with embodiment 1, and tackiness agent uses the UV cure adhesive of prescription 2,
Prescription 2:
Aliphatic urethane acrylate (CN962 of Sartomer company) 35
Polyalcohol modified epoxy acrylate (EA205 of Shaanxi Jin Ling photo-curing material company) 25
Phenoxyethyl acrylate (SR339 of Sartomer company) 10
Simple function group acrylic acid ester (CD9050 of Sartomer company) 12
Polyoxyethylene glycol (600) diacrylate (SR6 of Sartomer company 10
Irgacure 184 (CIBA company) 2
Darocure 1173 (CIBA company) 3
Response type tertiary amine compound (UCB. S.A. (BE) Bruxelles Belgium 7100) 2.7
Solvent-borne type defoamer (Deuchem Co., Ltd. 3100) 0.3
Condition of cure: 80w/cm high voltage mercury lamp, room temperature irradiation 8 seconds; Applications as laminates promptly obtained in 3 minutes the polaroid of inner protection film compound 100 ℃ of left and right sides thermal treatments behind the UV photoirradiation.Carry out Performance Detection then, during its test result sees Table.
Embodiment 3
Make optically active PVA polaroid functional membrane by embodiment 1 with quadrat method, make inner protection film with the TAC film, complex method is with embodiment 1, and tackiness agent uses the UV cure adhesive of prescription 3,
Prescription 3:
Poly-butadiene methacrylic ester (6143A-80 of Changxing chemical industrial company) 15
Modified by polyacid epoxy acrylate (EA210 of Shaanxi Jin Ling photo-curing material company) 15
Trifunctional group acrylate (CD9051 of Sartomer company) 15
Ethoxyquin bis-phenol diacrylate (SR602 of Sartomer company) 25
NONYL PHENOL ETHOXYLATED acrylate (CD612 of Sartomer company) 15
Tetramethylolmethane three acrylic acid esters 13
Irgacure 184 (CIBA company) 1
TPO (CIBA company) 1
Condition of cure: 80w/cm high voltage mercury lamp, room temperature irradiation 5 seconds; Applications as laminates promptly obtained in 3 minutes the polaroid of inner protection film compound 100 ℃ of left and right sides thermal treatments behind the UV photoirradiation.Carry out Performance Detection then, during its test result sees Table.
Embodiment 4.
Make optically active PVA polaroid functional membrane by embodiment 1 with quadrat method, make inner protection film with the TAC film, complex method is with embodiment 1, and tackiness agent uses the UV cure adhesive of prescription 4,
Prescription 4:
Poly-butadiene methacrylic ester (CN962 of Sartomer company) 30
Modified by polyacid epoxy acrylate (EA205 of Shaanxi Jin Ling photo-curing material company) 20
Trifunctional group acrylate (CD9051 of Sartomer company) 15
2-ethylhexyl acrylic acid ester 15
Trimethylolpropane tris acrylic acid ester 15.7
Irgacure 184 (CIBA company) 2
Irgacure 907 (CIBA company) 2
Solvent-borne type defoamer (Deuchem Co., Ltd. 3100) 0.3
Condition of cure: 80w/cm high voltage mercury lamp, room temperature irradiation 5 seconds; Applications as laminates promptly obtained in 3 minutes the polaroid of inner protection film compound 100 ℃ of left and right sides thermal treatments behind the UV photoirradiation.Carry out Performance Detection then, during its test result sees Table.
Embodiment 5.
Make optically active PVA polaroid functional membrane by embodiment 1 with quadrat method, make inner protection film with the TAC film, complex method is with embodiment 1, and tackiness agent uses the UV cure adhesive of prescription 5,
Prescription 5:
Poly-butadiene methacrylic ester (CN966J75 of Sartomer company) 20
Modified by polyacid epoxy acrylate (CN301 of Sartomer company) 25
Trifunctional group acrylate (CD9051 of Sartomer company) 15
The single acrylic acid ester of phenolic group oxyethyl group (3EO) (Kening Co.,Ltd of Henkel group 4039) 19
Dipentaerythritol five acrylic acid esters 15
Irgacure 184 (CIBA company) 2
Darocure 1173 (CIBA company) 2
Response type tertiary amine compound (P115 of UCB. S.A. (BE) Bruxelles Belgium) 2
Condition of cure: 80w/cm high voltage mercury lamp, room temperature irradiation 8 seconds; Applications as laminates promptly obtained in 3 minutes the polaroid of inner protection film compound 100 ℃ of left and right sides thermal treatments behind the UV photoirradiation.Carry out Performance Detection then, during its test result sees Table.
Comparative example
It is bonding with compounding machine to make PVA polarizing coating inner protection film by the method for embodiment 1; the superimposed good pre-composite sheet of TAC/ polarizing coating/TAC is put between the composite roll; in the middle of two TAC films and polarizing coating, clamp-on the PVA tackiness agent; the starting compounding machine carries out compound; composite sheet obtained polaroid down in dry 15~30 minutes at 50~90 ℃, with obtaining polaroid with quadrat method outer protective membrane of applying and pressure-sensitive adhesive layer among the embodiment.With quadrat method test transmitance and stripping strength.During its test result sees Table.
The performance test results
Test event Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Comparative example
Transmitance [1](%) 92.3 92.2 92.6 92.5 92.7 92.4
Stripping strength [2] Tear strength greater than the TAC film
Time of drying 6 seconds 8 seconds 5 seconds 5 seconds 8 seconds 15 minutes
Polaroid performance before aging Transmitance (%) 43.2 43.5 43.1 43.2 43.3 43.1
Degree of polarization (%) 99.6 99.2 99.8 99.7 99.8 99.7
Cracking situation (crack at edge mm) Do not have Do not have Do not have Do not have Do not have Do not have
Aging polaroid performance after 1000 hours [3] Transmitance changes (%) 2.1% 2.2% 2.1% 2.1% 2.3% 4.2%
Degree of polarization decline (%) 3.2% 3.3% 3.1% 3.2% 3.4% 6.3%
Cracking situation (crack at edge mm) 1 1 1 1 1 2
Annotate: [1]. the transmittance of glue-line and two-layer TAC film.
[2]. the stripping strength of polarizing coating and TAC protective membrane.
[3]. aging condition: 40~42 ℃ of temperature, relative humidity 90~95%.
Beneficial effect
Can be found out by test result in the table; it is bonding for the inner protection film of polaroid that the UV cure adhesive can replace the PVA adhesive; after adopting the present invention; use the polaroid wet-hot aging performance (weather resisteant) of the bonding TAC diaphragm of UV cure adhesive to improve; rate of drying improves; save the energy, production efficiency is high, use is economical.

Claims (10)

1. one kind is used for the laminated UV curable adhesive of polarizing plate protective film, and it comprises: (1) prepolymer; (2) reactive monomer; (3) light trigger; (4) auxiliary agent, its each component concentration is (weight percent):
Prepolymer 10~70%;
Reactive monomer 20~80%;
Light trigger 1~10%;
Auxiliary agent 0~10%.
2. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 1 is characterized in that wherein said each components contents that is used for the laminated UV curable adhesive of polarizing plate protective film is:
Prepolymer 30~60%
Reactive monomer 32~68%
Light trigger 2~5%;
Auxiliary agent 0~3%.
3. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 1 and 2 is characterized in that wherein said prepolymer is epoxy acrylate, urethane acrylate, polyester acrylate or polyolefine acrylate.
4. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 3 is characterized in that wherein said prepolymer is EA205, EA210, CN118, CN962, CN966J75,6134A-80, CN301 or CN302.
5. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 1 and 2 is characterized in that wherein said reactive monomer is the acrylate of simple function group, bifunctional or many bifunctionals.
6. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 5; it is characterized in that wherein said reactive monomer is the own propyl group olefin(e) acid of a 2-ethyl ester; phenoxyethyl acrylate; the NONYL PHENOL ETHOXYLATED acrylate; butylene glycol diacrylate; polyoxyethylene glycol (600) diacrylate; ethoxylated bisphenol A diacrylate (Sartomer Co.CD541); Viscoat 295; pentaerythritol triacrylate; two seasons penta 6 pure five acrylate; PHOTOMER4039 (phenolic group oxyethyl group 3EO mono acrylic ester); CD9050 (simple function group acrylate) or CD9051 (trifunctional acid ester).
7. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 1 and 2 is characterized in that wherein said light trigger is a radical photoinitiator.
8. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 7 is characterized in that wherein said light trigger is Irgacure 184, Darocure 1173, Irgacure 907 or TPO.
9. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 1 and 2 is characterized in that wherein said auxiliary agent comprises curing reaction promotor, adhesion promotor or defoamer.
10. a kind of laminated UV curable adhesive of polarizing plate protective film that is used for according to claim 9 is characterized in that in the wherein said auxiliary agent, curing reaction promotor is P115 or 7100; Adhesion promotor is a TriMethylolPropane(TMP); Defoamer is a solvent-borne type defoamer 3100.
CN 03148316 2003-07-01 2003-07-01 UV photo-curing adhesive for lamination of polarizer sheet protective membrane Expired - Lifetime CN1290953C (en)

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