WO2004048079A1 - 再帰性反射シート - Google Patents
再帰性反射シート Download PDFInfo
- Publication number
- WO2004048079A1 WO2004048079A1 PCT/JP2003/014288 JP0314288W WO2004048079A1 WO 2004048079 A1 WO2004048079 A1 WO 2004048079A1 JP 0314288 W JP0314288 W JP 0314288W WO 2004048079 A1 WO2004048079 A1 WO 2004048079A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin
- retroreflective
- sheet
- adhesive layer
- film
- Prior art date
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- G02B5/12—Reflex reflectors
- G02B5/126—Reflex reflectors including curved refracting surface
- G02B5/128—Reflex reflectors including curved refracting surface transparent spheres being embedded in matrix
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- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/00—Stock material or miscellaneous articles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/24372—Particulate matter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
- Y10T428/2462—Composite web or sheet with partial filling of valleys on outer surface
Definitions
- the present invention relates to a retroreflective sheet used for a road sign, a guide sign, a safety guidance sign display plate, or other safety signs.
- Retroreflective sheets are widely used for traffic safety, mainly as traffic signs, information signs, warning signs, and regulatory signs.
- the retroreflective sheet includes a plurality of retroreflective elements, a resin support sheet, a transparent cover film disposed on a surface side of the resin support sheet, and a resin cover sheet.
- a pressure-sensitive adhesive layer on the back side, wherein the retroreflective element is held by at least one of the resin support sheet and the cover film; and the resin support sheet and the cover film are the resin support sheet.
- a release film is further laminated on the retroreflective sheet.
- the release film one obtained by applying a release agent such as a silicone compound or a fluorine compound to a release material such as a polyester film, polylamine paper, polypropylene, or polyethylene is used.
- a release agent such as a silicone compound or a fluorine compound
- a release material such as a polyester film, polylamine paper, polypropylene, or polyethylene
- a pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer a solvent-type pressure-sensitive adhesive, an emulsion-type pressure-sensitive adhesive, a pressure-sensitive adhesive cured by an electron beam or ultraviolet light, or the like can be used.
- a retroreflective sheet is used as a substrate, for example, a metal substrate such as aluminum, iron plate, painted iron plate, or stainless steel plate, or a substrate such as fiber reinforced plastic (FRP) or rigid PVC.
- FRP fiber reinforced plastic
- the retroreflective sheet when the retroreflective sheet is attached to the substrate, when the retroreflective sheet is attached in a distorted state, the retroreflective sheet is stressed over time due to the residual stress inside the retroreflective sheet. There was a problem in that the reflection sheet suffered from blemishes, blisters, bubbles, and peeling. Disclosure of the invention
- the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer crosslinks a resin having a weight average molecular weight of 500,000 or more. Resin having a holding force at 100 ° C. of 100 mm / 100 O min or less, and 50% after 30 minutes of sticking to the polyforce resin plate. Is over Retroreflective sheets for gas generating adherends have been proposed. However, in practice, even if an adhesive satisfying this condition was used as a measure for preventing blisters or the like of the retroreflective sheet, the above problem could not be solved sufficiently.
- the grooves of the resin support sheet formed at the time of heating and pressurizing embossing be used as an air discharge path.
- foreign substances such as water, dust, and dust enter the grooves, reduce the adhesive performance, and cause troubles such as falling off or peeling off the sheet.
- the present invention provides a retroreflective sheeting capable of preventing abnormal appearance of the sheet such as blisters, bubbles, bubbles, peeling, etc., which occurs with time after attaching the substrate, in order to solve the conventional problem.
- the purpose is to provide.
- the retroreflective sheet of the present invention is to provide.
- a plurality of retroreflective elements; a resin support sheet; and the resin support sheet A transparent cover film disposed on the front side of the resin support sheet, and an adhesive layer formed on the back side of the resin support sheet, wherein the retroreflective element is formed of the resin support sheet and the cover film.
- the resin support sheet and the cover film are held by at least one of them, and the resin support sheet and the cover film are joined by heating: n-pressure embossing from the back side of the resin support sheet to form a joint portion.
- a retroreflective sheeting in which a groove of the bonding portion is formed on a back surface side of a support sheet, wherein the groove is filled with a part of the pressure-sensitive adhesive layer, and a residual ratio of the pressure-sensitive adhesive layer is:
- a retroreflective sheeting having a range of 10% or more and 50% or less and a falling time of the pressure-sensitive adhesive layer of 10 hours or more and 150 hours or less.
- the residual ratio (%) (residual displacement ⁇ initial displacement) X 100
- the initial displacement was measured using a Yamamoto-type cohesive force measuring device, and the recursion of 10 mm X 5 mm was performed on a mirror-finished flat plate of SUS304 steel plate specified in JISG 4305 with a width of 5 mm.
- the reflective sheet is crimped using a crimping device specified in JISZ 0237, and immediately after crimping, a load of 17 g is applied to both ends of the retroreflective sheet via a thread.
- the displacement (mm) between the flat plate and the retroreflective sheet which occurs after 5 minutes by adding 200 g of the load for measurement to the load, means
- the residual displacement means a shift between the flat plate and the retroreflective sheet occurring 10 minutes after the removal of the load of 200 g.
- the drop time refers to the drop time of the retroreflective sheet when a 9.8 N load is applied in a holding force test at 40 according to the holding force test of JISZ 0237. .
- a method for manufacturing a laminate of a release material having heat resistance and a retroreflective sheet of the present invention includes a plurality of retroreflective elements, a resin support sheet, and a resin support sheet disposed on the surface side of the resin support sheet. Including a transparent cover film, The retroreflective element is held on at least one of the resin support sheet and the cover film, and the resin support sheet and the force film are heated from the back side of the resin support sheet.
- the heat-resistant release material having the pressure-sensitive adhesive layer formed thereon is disposed on the back side of the retroreflective sheeting raw material, and 50 ° C. or more from the heat-resistant release material side to 90 ° C.
- a roll surface temperature of less than or equal to ° C., and affixed with a linear pressure between the rolls of not less than 100 N / cm and not more than 800 NZ cm a part of the pressure-sensitive adhesive layer was placed in the groove of the resin-made support sheet.
- FIG. 1 is a cross-sectional view showing a step of forming a reflective film on a glass sphere in an example of the production method of the present invention.
- FIG. 2 is a cross-sectional view showing a step of forming a resin support sheet in one example of the production method of the present invention.
- FIG. 3 is a cross-sectional view showing a step of transferring a glass ball in an example of the production method of the present invention.
- FIG. 4 is a cross-sectional view showing a step of embedding glass balls in a resin support sheet in an example of the production method of the present invention.
- FIG. 5 is a cross-sectional view showing a step of exposing a non-reflective surface of a glass sphere in an example of the production method of the present invention.
- FIG. 6 shows the back side of the resin support sheet in one example of the production method of the present invention.
- Sectional drawing which shows the process of carrying out heating press embossing from FIG.
- FIG. 7 is a cross-sectional view showing the heating and pressing embossing in an example of the production method of the present invention.
- FIG. 8 is a cross-sectional view showing a step of covering the embossed molding surface side with a heat-resistant release material having an adhesive layer formed thereon in one example of the production method of the present invention.
- FIG. 9 is a cross-sectional view showing a step of replacing a heat-resistant release material with a resin release film in an example of the production method of the present invention.
- FIG. 10 is a cross-sectional view showing a capsule cube corner-type retroreflective sheeting after heat-press embossing in an example of the production method of the present invention.
- FIG. 11 is a view for explaining an appearance measuring method used in an example of the present invention.
- FIG. 12 is an explanatory view showing a measuring method using the Yamamoto-type cohesive force measuring device used in the embodiment of the present invention.
- FIG. 13 is a schematic perspective view of a Yamamoto-type cohesive force measuring device used in an embodiment of the present invention.
- the retroreflective sheet of the present invention is a retroreflective sheet capable of preventing abnormal appearance of the retroreflective sheet which occurs with time after being attached to a substrate.
- the present inventors have found that by reducing the air remaining between the retroreflective sheet and the substrate when the retroreflective sheet is attached, the retroreflection that occurs over time after the retroreflective sheet is attached to the substrate is reduced. We found that abnormal appearance of the sheet can be prevented. Even if the retroreflective sheet is adhered in a distorted state, the stress remaining on the retroreflective sheet can be reduced by the pressure-sensitive adhesive layer provided on the back side of the resin-made support sheet. In addition, it is possible to prevent the appearance of the retroreflective sheet from being abnormal. And found.
- the grooves formed during the embossing under heat and pressure are pre-filled with an adhesive layer, and (2) the adhesiveness obtained from the residual displacement and the initial displacement using the Yamamoto-type cohesive force measuring device.
- (3) By defining the residual ratio of the adhesive layer in a specific range, and (3) by defining the falling time of the pressure-sensitive adhesive layer in a specific range, the air remaining when attaching the retroreflective sheet is reduced, and The present inventors have found that the stress remaining on the retroreflective sheet after attachment can be reduced, and have completed the present invention.
- the thickness of the pressure-sensitive adhesive layer at a portion where the groove on the back surface side of the resin support sheet is not formed is in a range of 20 m or more and 110 m or less, It is more preferably in the range of 30 to 100 zm, particularly preferably in the range of 40 to 90 m.
- the thickness is 20 // m or more, the groove of the resin-made support sheet can be filled with a part of the pressure-sensitive adhesive layer, and the entire pressure-sensitive adhesive layer can have a uniform thickness. This is because it has a sufficient thickness and a sufficient adhesive strength can be obtained.
- the adhesive does not protrude, the adhesive does not protrude from the edge when the sheet is slit to a fixed length, and the adhesive does not adhere to the slitter teeth. This is because cohesive failure of the adhesive is less likely to occur.
- the filling rate of the groove by the pressure-sensitive adhesive layer is 50% or more.
- A means the area of the groove per unit area of the retroreflective sheet
- the B is the groove and the viscosity per unit area of the retroreflective sheet. It means the area of the void formed at the interface of the adhesive layer.
- filling refers to a state in which the groove is filled with a part of the pressure-sensitive adhesive layer.
- the filling rate is more preferably 60% or more, more preferably 70% or more. When the filling rate is 50% or more, air between the retroreflective sheet and the substrate can be sufficiently removed when the retroreflective sheet is attached to the substrate.
- the residual ratio is in a range of 10% or more and 50% or less, preferably in a range of 15% or more and 45% or less, and more preferably in a range of 20% or more and 40% or less.
- the range is as follows.
- the residual ratio indicates the stress relaxation of the pressure-sensitive adhesive layer.
- the residual ratio is in the range of 10% or more and 50% or less, at the time of attaching the retroreflective sheet of the present invention, the internal stress remaining in the retroreflective sheet is alleviated by the pressure-sensitive adhesive layer. This is because appearance defects such as blemishes, blisters, bubbles, and peeling can be prevented.
- the falling time is in a range of 10 hours to 150 hours, preferably in a range of 20 hours to 140 hours, and more preferably in a range of 40 hours to 1 hour. 30 hours or less.
- the drop time indicates the cohesive force of the pressure-sensitive adhesive layer. If the drop time is 10 hours or more, the cohesive force of the pressure-sensitive adhesive is sufficiently large, so that the adhesive does not lose the shrinkage stress of the retroreflective sheet, and as a result, the retroreflective sheet does not shrink. is there. If the drop time is 150 hours or less, the cohesive force of the pressure-sensitive adhesive does not become too high, so that the retroreflective sheet adhered to the substrate is not used until practical use. Since the internal stress remaining on the reflective sheet is reduced by the adhesive layer, after the retroreflective sheet is put to practical use, the retroreflective sheet body does not generate screen, blister, bubble, peeling, etc. It is.
- the retroreflective sheet of the present invention the residual ratio of the pressure-sensitive adhesive layer and the falling time
- the residual ratio and the drop time were measured, or after forming the adhesive layer on the back side of the resinous support sheet, the temperature was 23 ⁇ 2 ° C and Preference is given to the residual rates and fall times measured after aging for 7 days in an environment with a relative humidity of 65 ⁇ 5%.
- the residual rate and the falling time of the pressure-sensitive adhesive layer are changed to a temperature of 50 ° C. and a relative humidity of 50%. It is preferable that the residual ratio and the drop time are measured after the aging treatment and the aging treatment for 10 days in an environment of 65 ⁇ 5%.
- the pressure-sensitive adhesive layer of the present invention is preferably formed from a resin such as an acrylic resin or a rubber resin.
- a resin such as an acrylic resin or a rubber resin.
- the acrylic resin a polymer-based acryl-based resin containing at least one of an acrylic ester copolymer and an acrylic prepolymer as a main component or a tackifier and a coagulant in the acrylic resin are further added.
- a modified acrylic resin to which a monomer for imparting force is added is preferable.
- the rubber-based resin examples include natural rubber, isoprene rubber, styrene-butadiene block copolymer, styrene-isoprene-styrene block copolymer, butyl rubber, styrene-ethylene-butylene-styrene copolymer, and polyisobutylene.
- synthetic rubbers such as polyvinyl isobutyl ether, black rubber, nitrile rubber and the like.
- These rubber resins include natural resins such as rosin, modified rosin, rosin and derivatives of modified rosin, terpene phenolic resins, polyterpene resins, modified terpene, aliphatic hydrocarbon resins, cyclopentene resins, Aromatic petroleum resin, phenolic resin, alkylphenol-acetylene resin, cumarone-indene resin, vinyltoluene- ⁇ -methyl Tackifiers such as styrene copolymer, various plasticizers, antioxidants, stabilizers, softeners such as oils, fillers, stabilizers, pigments, colorants, and the like may be added as necessary. These can be used in combination of two or more if necessary.
- acrylic resin examples include an alkyl group, a hydroxyl group, an epoxy group, an alkoxy group, a phenoxy group, an oxyethylene group, an amino group, an amide group, a propyloxyl group, a halogen atom, a phosphoric acid group, a sulfonic acid group, and a urethane group.
- Acrylic vinyl monomers having an alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) 7 acrylate, butyl (meth) acrylate, Xyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isosomil (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate , Dodecyl (meth) acrylate, isobutyl (meth) acrylate, and the like.
- Examples of the acrylyl vinyl monomer having a hydroxyl group include 2-hydroxylethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-hydroxypropyl 2-hydroxypropyl ( Meth) acrylate and the like.
- Examples of the acrylic vinyl monomer having an epoxy group include dalicidyl (meth) acrylate and methyldaricidyl (meth) acrylate.
- Examples of the acrylic vinyl monomer having an alkoxy group include methoxyethyl (meth) acrylate, ethoxyxyl (meth) acrylate, and butoxyshethyl (meth) acrylate.
- Examples of the acryl-based biel monomer having a phenoxy group include phenoxy shetyl (meth) acrylate.
- acrylic vinyl monomer having a ethoxyethylene group examples include: ethylene glycol (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, phenoxydiethylene glycol (meth) acrylate, and phenoxy. And polyethylene glycol (meth) acrylate.
- Examples of the acryl-based vinyl monomer having an amino group include dimethylaminoethyl (meth) acrylate, getylaminoethyl (meth) acrylate, N-tert-butylaminoethyl (meth) acrylate, and methacryloyloxetyl trimethylammonium. ⁇ Muclide (meth) acrylate and the like.
- acrylic vinyl monomer having an amide group examples include (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, ⁇ '-methylenebis (meth) acrylamide, and the like. .
- acrylic vinyl monomer having a hydroxyl group examples include acrylic acid, methacrylic acid, 2-methacryloyloxysuccinic acid, 2-methacryloyloxetyl maleic acid, and 2-methacryloyloxetyl.
- acrylic acid methacrylic acid, 2-methacryloyloxysuccinic acid, 2-methacryloyloxetyl maleic acid, and 2-methacryloyloxetyl.
- examples include phthalic acid and 2-methacryloyloxethyl hexahydrophthalic acid.
- Examples of the acryl-based vinyl monomer having a halogen atom include trifur Oroethyl (meta) acrylate, pentadecafluoroxhetil (methyl) acrylate, 2-chloroethyl (meth) acrylate, 2, 3-dibromopropyl (meth) acrylate, tribromophenyl (Meth) acrylate and the like.
- acrylic vinyl monomer having a phosphate group examples include 2-methacryloyloxyshethyl diphenyl phosphate (meth) acrylate, trimethacryloyloxyshethyl phosphate (meth) acrylate, and triacryloyloxyshethyl phosphate. (Meth) acrylate and the like.
- acrylic vinyl monomer having a sulfonic acid group examples include sodium sulfopyl propyl (meth) acrylate, sodium 2-sulfoethyl (meth) acrylate, sodium 2-acrylamide-12-methylpropanesulfonate, and the like. Is mentioned.
- acrylic vinyl monomer having a urethane group examples include urethane (meth) acrylate.
- Examples of the acryl-based vinyl monomer having a phenyl group include phenyl (meth) acrylate, -tert-butylphenyl (meth) acrylate, o-biphenyl (meth) acrylate, and the like.
- Examples of the acryl-based vinyl monomer having a benzyl group include benzyl (meth) acrylate.
- Examples of the acryl-based vinyl monomer having a tetrahydrofurfuryl group include tetrahydrofurfuryl (meth) acrylate.
- Other copolymerizable monomers include vinyl monomers having a silane group, styrene, chlorostyrene, ⁇ -methylstyrene, vinyl toluene, vinyl chloride, biel acetate, biel propionate, Veoval 0 (manufactured by Shell Chemical Co., Ltd. Vinyl alkylate compound), acrylonitrile, Vinyl pyridine and the like.
- vinyl monomer having a silane group examples include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris () 3-methoxyethyl) silane, vinyltriacetylsilane, and methacryloyloxypropyltrimethoxysilane.
- copolymerizable monomers include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, and 1,3-butylene.
- Glycoyl (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethanetetra (meth) acrylate, divinylpentene, N, N'-methylenebisacrylylamide, 1,4-butanediol ( (Meth) acrylate, 1,6-hexanediol di (meth) acrylate, and the like can be used. This monomer can be used to the extent that coating suitability is not reduced.
- acrylic resin includes various additives such as natural resin such as rosin, modified rosin, rosin and derivatives of modified rosin, polyterpene resin, modified terpene, terpene phenol resin, aliphatic hydrocarbon resin, Tackifiers such as cyclopentadiene resin, aromatic petroleum resin, phenolic resin, alkylphenol-acetylene resin, coumarone-indene resin, vinyltoluene- ⁇ -methylstyrene copolymer, and various plasticizers
- An antioxidant, a stabilizer, a softener such as oil, a filler, a colorant, a pigment and the like can be added as necessary. These can be used in combination of two or more if necessary.
- the acrylic resin is produced by polymerizing by any method among conventionally known methods such as a bulk polymerization method, a solution polymerization method, a suspension polymerization method, and an emulsion polymerization method.
- the monomer concentration at the time of polymerization is usually about 30 to 70% by weight, preferably about 40 to 60% by weight.
- the retroreflective sheet of the present invention is preferably a retroreflective sheet in which the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition containing a cross-linkable acrylic copolymer and a curing agent.
- the adhesive ratio may be changed by changing the mixing ratio based on the type of the functional group and the substituent in the acrylic resin and the combination with the curing agent.
- a mixture with a residual ratio and a falling speed falling within the range of the present invention is used. It is preferable to choose.
- the pressure-sensitive adhesive layer is, for example, after applying the resin solution on a heat-resistant release material, at 70 ° C. for 1 minute and at 100 ° C. For 2 minutes.
- curing agent examples include sorbitol polydaricidyl ether, polyglycerol polydaricidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, triglycidyl tris (2-hydroxyethyl) isocyanurate, and glycerol poly.
- Minopurasuto curing agents such as condensates, M g 2+, C a 2+ , Z n 2+, a 1 3+ ionic curing agent and the like (e.g. zinc acetate, magnesium acetate, calcium acetate, etc.), etc. Is mentioned.
- the residual ratio and the drop time of the pressure-sensitive adhesive layer of the retroreflective sheet of the present invention may be determined, for example, by appropriately setting the types and blending ratios of the resin and the curing agent as the material of the pressure-sensitive adhesive layer. Can be adjusted.
- the retroreflective sheet laminate of the present invention includes the retroreflective sheet of the present invention and a resin release film, wherein the resin release film is the pressure-sensitive adhesive. It is the retroreflective sheet laminate laminated on a layer.
- the resin release film is preferably a flexible resin film having a Young's modulus of 50 MPa or more and 2000 MPa or less.
- the Young's modulus is more preferably in the range of 100 MPa to 150 MPa, and even more preferably in the range of 150 MPa to 100 MPa.
- the flexible resin film is preferably an unstretched polypropylene (PP) film or a low-density polyethylene (LDPE) film.
- PP polypropylene
- LDPE low-density polyethylene
- the thickness of the unstretched polypropylene film is preferably in the range of 20 to 150 m.
- the thickness is more preferably in a range from 30 m to 130 m, and still more preferably in a range from 40 m to 100 m.
- the low-density polyethylene film preferably has a thickness in the range of 20 m to 200 m.
- the thickness is more preferably in a range from 40 m to 150 m, and further preferably in a range from 60 m to 100 m.
- the method for manufacturing a laminate of a heat-resistant release material and the retroreflective sheet of the present invention includes a plurality of retroreflective elements, a resin support sheet, and a resin support sheet.
- the resin support sheet is joined by heating and pressing from the back side by embossing to form a joint, and the resin support sheet is formed.
- the heat-resistant release material on which the pressure-sensitive adhesive layer is formed is disposed on the back side of the raw material, and from the heat-resistant release material side, at a roll surface temperature of 50 ° C or more and 90 ° C or less, and a step of filling a part of the pressure-sensitive adhesive layer in the groove of the resin-made support sheet by laminating at a linear pressure between the rolls of l O ONZcm or more and 80 ONZ cm or less.
- the manufacturing method further includes a step of subjecting the pressure-sensitive adhesive layer to an aging treatment for 7 days in an environment of 23 ⁇ 2 ° (: relative humidity of 65 ⁇ 5%.
- the release material having the following is paper, synthetic resin laminated paper, polypropylene film or polyester film, in which case the thickness of the paper is preferably in the range of 20 z / m to 200 m. The thickness is more preferably in the range of 4 to 170 m, and even more preferably in the range of 60 to 150 m. The thickness is more preferably in the range of 50 to 200 m, and more preferably in the range of 70 to 180 im. In this case, the polyp is preferably used.
- the thickness of the pyrene film is in the range of 15 xm to 250 im
- the thickness is more preferably in the range of 30 111 to 230 111, and in the range of 50 m to 200 m
- the thickness of the polyester film is preferably in a range of 15 m or more and 250 m or less.
- the thickness is preferably 30 m or more and 22 m or less.
- the range is more preferably 0 m or less, and even more preferably 50 m or more and 190 m or less.
- the retroreflective sheet laminate of the present invention as an example of a product shipping form includes, for example, a laminate of the retroreflective sheet of the present invention and a heat-resistant release material manufactured by the above-described manufacturing method.
- the heat-resistant release material After peeling off the heat-resistant release material, it can be manufactured by sticking a resin release film on the surface of the adhesive layer of the retroreflective sheet.
- the heat-resistant release material after forming the pressure-sensitive adhesive layer, the heat-resistant release material is peeled off, and after being replaced with the resin-made release film, 23 ⁇ 2 ° C. and a relative humidity of 65 Aging treatment may be performed for 7 days in an environment of ⁇ 5%.
- the heat-resistant release material after forming the pressure-sensitive adhesive layer and performing the aging treatment for 7 days, the heat-resistant release material may be peeled off, and the film may be replaced with the resin-made release film.
- the aging treatment for 7 days may be performed separately before and after replacing the resin release film.
- FIG. 1 to 7 show an example of a method of manufacturing a retroreflective sheet of the present invention.
- the retroreflective element a transparent sphere having a reflecting mirror in a hemispherical portion, a cube corner type retroreflective element, or the like can be used.
- a transparent sphere having a reflecting mirror in the hemisphere portion is used will be exemplified.
- the retroreflective element is held on at least one of the resin support sheet and the cover film.
- the transparent sphere has a hemispherical side covered with the reflecting mirror.
- An example of a capsule lens type retroreflective sheeting when held so as to be embedded in the resin support sheet will be described. However, in the case of a cube-corner type retroreflective element, it is held by the cover film.
- a reflecting mirror is formed on a hemispherical portion of the transparent sphere.
- a plurality of transparent glass spheres 2 as the transparent spheres are embedded on the surface of a polyethylene glass sphere temporary fixing layer 7 laminated on a polyester film 8 as a first film.
- the laminated body of the glass ball temporary fixing layer 7 and the polyester film 8 is heated to soften the polyethylene, and the glass spheres 2 are submerged in the glass ball temporary fixing layer 7.
- the glass sphere 2 is an example of the transparent sphere as described above.
- the transparent sphere include glass spheres, transparent resin beads, and the like. Among them, glass spheres are preferable.
- the particle diameter of the transparent sphere is, for example, about 5 zm to 300 m, preferably about 20 m to 90 m, and more preferably 40 m to 80 xm.
- the refractive index of the transparent sphere is, for example, about 1.8 to 2.1, preferably about 1.9 to 1.95, and more preferably 1.9 to 1.93.
- a metal reflective film 3 is formed on the hemispherical surface of the glass sphere 2 exposed from the surface of the glass sphere temporary fixing layer 7 by a vapor deposition method. Since this vapor deposition is performed on the entire surface of the glass ball temporary fixing layer 7, the metal reflection film 3 is formed not only on the glass balls 2 but also on the surface of the glass ball fixing layer 7.
- the material of the metal reflective film 3 include aluminum, gold, silver, copper, nickel, chromium, tin, alloys containing these metals, titanium oxide, titanium nitride, and other materials having excellent light reflectance. Aluminum is preferred.
- retroreflective sheet of the present invention there is a retroreflective sheet having the following two types of structures.
- (A) A type in which there is a primer layer 5 on the back of the resin support sheet 4 (see Fig. 2).
- (B) A type in which the primer layer 5 is not provided on the back surface of the resin support sheet 4.
- an adhesive layer is laminated on the back surface of the primer layer 5, and in the case of (B), the adhesive layer is laminated on the back surface of the resin support sheet 4.
- a polymer or low-molecular plasticizer may be used for the resin support sheet 4 in some cases. These plasticizers and the like migrate over time to the interface between the pressure-sensitive adhesive layer and the resinous support sheet 4 or to the pressure-sensitive adhesive layer, thereby deteriorating the pressure-sensitive adhesive performance of the pressure-sensitive adhesive layer.
- the primer layer 5 can be used to solve this problem, that is, to prevent migration of a plasticizer or the like from the resin support sheet 4 to the pressure-sensitive adhesive layer.
- thermosetting resin examples include a resin having a functional group, for example, a self-crosslinking resin having one or more functional groups or a resin having one or more functional groups, and a functional group capable of reacting with these functional groups. Combinations with group-containing curing agents are preferred.
- a silane coupling agent, a relatively low molecular weight resin having a polar group, or the like may be added to the thermosetting resin in order to improve the spreadability and fixability of the glass sphere.
- the total weight of the resin having the functional group and the curing agent is 50%, preferably 50% by weight of the resin constituting the resin support sheet 4. Preferably it is greater than 70%.
- the resin having the functional group examples include a vinyl-based copolymer such as an acrylic resin, a fluororesin, and a styrene copolymer, and a polycondensation-based copolymer such as a polyester resin and a polyurethane resin.
- the functional group refers to a reactive functional group or a self-crosslinkable functional group that participates in the reaction with the curing agent component.
- Reactive functional groups that participate in the reaction with the curing agent component include a hydroxyl group, a hydroxyl group, an epoxy group, an isocyanate group, and an amino group.
- the self-crosslinkable functional group examples include a hydrolyzable silyl group, an N-methylol acrylamide group, an alkyl etherified N-methylol acrylamide group, and an unsaturated double bond.
- the reactive functional group is a group having a so-called active hydrogen atom, such as a hydroxyl group, a propyloxyl group, an amino group or an acid amide group, an isocyanate-based curing agent; Aminoplast-based curing agents, polyepoxy compounds, acid anhydrides, and the like are included.
- the reactive functional group is an epoxy group or the like
- examples of the curing agent include polyamines and polybasic acids.
- examples of the curing agent include various polyhydroxy compounds such as glycols.
- a crosslinking accelerator may be further used.
- the crosslinking accelerator is a catalyst for hydrolysis or condensation of the hydrolyzable silyl group.
- examples of the crosslinking accelerator include various acidic compounds such as sulfuric acid, hydrochloric acid, and phosphoric acid, various amine compounds such as monomethylamine and triethylamine, di-n-butyltin dilaurate, and di-n-butyltin dilaurate.
- various organic tin compounds such as di-n-butyltin dioctate can be used.
- the resin forming the primer layer 5 examples include a resin having the functional group forming the resin support sheet 4, or a resin having a functional group which reacts with the resin and the functional group of the resin. Resins and curing agents selected from curing agents can be used.
- the resin used for the primer layer 5 is preferably one having excellent interlayer adhesion with the resin support sheet 4.
- the primer layer 5 is formed, for example, by applying a solution of the resin forming the primer layer on a separately prepared polyester film 6 as a second film, and drying the solution by using, for example, a hot air drier. Obtainable.
- the second film is an example of a support in the preferred production method of the present invention.
- the thickness of the primer layer 5 after drying is, for example, 3 / m to 100 / zm, preferably 6 m to 50 m.
- the thickness is 3 m or more, the effect of preventing the migration of the plasticizer or the like is increased, and thus it is preferable.
- the thickness is 100 m or less, workability such as attaching a retroreflective sheet is preferred. Is preferred because the
- a resin support sheet 4 is formed on the surface of the primer layer 5 (FIG. 2).
- the resin forming the resin-made support sheet 4 any of the resin having the functional group and the resin having no functional group can be used, but the resin having the functional group is preferable.
- the resin support sheet 4 can be obtained, for example, by applying a resin solution for forming the resin support sheet on the primer layer 5 and drying the resin solution using, for example, a hot air dryer. See Figure 2).
- the thickness of the resin support sheet 4 after drying is, for example, 10 ⁇ 111 to 300 m, preferably about 30 m to 100 m.
- the (B) retroreflective sheet of the type having no primer layer 5 can be obtained by omitting the step of preparing a single primer layer in the above-described method of producing a retroreflective sheet.
- a laminate of the polyester film 6, the primer layer 5, and the resin support sheet 4 is made to conform to the surface of the glass ball temporary fixing layer 7.
- the resin support sheet 4 is brought into contact with the surface of the glass sphere 2 on which the metal reflective film 3 of the glass sphere temporary fixing layer 7 is deposited.
- the laminated body was Press on the surface. The pressing is performed such that the hemispherical surface of the glass sphere 2 on which the metal reflective film 3 is deposited is embedded in the resin support sheet 4.
- a coupling agent or the like can be further added to the resin support sheet 4 in order to improve the fixing force of the resin support sheet 4 to the glass balls 2.
- the glass ball temporary fixing layer 7 is peeled off together with the polyester film 8 from the surface of the resin support sheet 4.
- the glass spheres 2 remain in the resin support sheet 4, and the metal reflection film 3 is deposited by the resin support sheet 4, so that the hemispherical side is buried and held.
- the metal reflection film 3 provided on a portion other than the hemisphere of the glass sphere 2 exposed from the surface of the glass sphere temporary fixing layer 7 remains on the surface of the glass sphere temporary fixing layer 7 as it is.
- the aging treatment is performed in a temperature environment of 30 to 40. It is preferable that the primer layer 5 and / or the resin support sheet 4 be cured. After that, it is to eliminate the dispersion of the performance of the joints formed during the heating and pressurizing embossing, and to stabilize the self-supporting form thereafter.
- a heat treatment step at 120 to 150 may be performed in order to improve the adhesion between the glass sphere 2 and the resin support sheet 4.
- the surface of the resin support sheet 4 holding the glass spheres 2 in the state shown in FIG. 6 is covered with the transparent cover film 1.
- the cover film 1 include unstretched acrylic film, polyester resin, acrylic resin, alkyd resin, urethane resin, vinyl chloride resin, polyphenol resin, fluorine resin, and acrylic silicone resin.
- a film with good transparency such as fat can be used.
- an unstretched acrylic film is preferable.
- the force-par film 1 a film other than a film manufactured by a casting method, that is, a film manufactured by a well-known technique such as an extrusion method or a calendar method can be used. Such a film is inevitably stretched by at least 10 to 20% in the flow direction of the film at the time of production in view of the production method, but is preferably in a non-stretched state as much as possible.
- thermoplastic resin is used as the cover film 1 because the resin support sheet 4 and the cover film 1 can be thermally fused well.
- the cover film 1 is made of a resin having low heat fusion suitability, for example, a part of a thermosetting resin, a fluororesin, a silicone resin, or the like, a laminate of the resin having excellent heat fusion suitability and the resin is used. Can be used as the cover film 1.
- the cover film 1 When forming the cover film 1, it may be formed by using an ultraviolet absorber or an antioxidant in combination.
- thermocompression bonding it is preferable to pass through a heating roll.
- the surface temperature of the roll is, for example, 150 to 240 ° C., and preferably 170 to 220 ° C.
- the thermocompression bonding can be performed, and the resin support sheet 4 and the cover film 1 can be adhered to each other. It is preferable because it can be retained.
- the surface temperature is 240 ° C. or lower, the polyester film 6 as the second film is not dissolved, and the workability of heating and pressing is improved, which is preferable.
- the polyester film 6 After embossing under heat and pressure, the polyester film 6 is peeled off to obtain a raw material of a retroreflective sheet. By the thermocompression bonding, a resin support sheet An embossed groove 10 is formed on the back side of 4.
- the groove has dimensions of, for example, a width of 200 to 800 mm and a depth of 100 to 150 m.
- the raw material of the retroreflective sheet constituting the retroreflective sheet of the present invention in addition to the raw material of the capsule lens type retroreflective sheet, a raw material of the retroreflective sheet manufactured by various known methods is used. be able to.
- a capsule cube corner type retroreflective sheet that is formed by heating can be used as a raw material of the retroreflective sheet. That is, a capsule including a force-per film 1, a cube-corner-type retroreflective element 14 disposed on the back surface of the cover film 1, a resin support sheet 4, and a bonded portion bonded by heat molding.
- a cube corner type retroreflective sheet can also be used.
- an adhesive layer is formed on a separately prepared heat-resistant release material.
- the pressure-sensitive adhesive is as described above.
- a known and commonly used hard release paper can be used.
- a base material provided with a sealing layer on base paper such as dalasin paper, clay-coated paper, kraft paper, and high-quality paper with a thickness of 30 to 100 ⁇ m, and a poly-laminate paper with a thickness of 50 to 200 m (Manufactured by laminating synthetic resin such as polyethylene or polypropylene on kraft paper or high-quality paper, etc.), or emulsion on polypropylene or polyethylene terephthalate film with a thickness of 15 to 250 m.
- a mold, a solvent-based or solvent-free silicone resin, a fluororesin, or the like is applied, and a release agent layer formed by heat curing, electron beam or ultraviolet curing, or the like can be used as appropriate.
- a silicone resin is particularly preferable.
- a method for forming the release agent layer a known and commonly used method, for example, a comma doctor, a bar coater, a gravure coater, a reverse roll coater, or the like is appropriately used.
- the pressure-sensitive adhesive layer 11 is formed on the heat-resistant release material by: This can be done as follows. For example, a pressure-sensitive adhesive solution can be applied onto the release agent layer surface of a release paper 12 as an example of the release material, and dried if necessary, to obtain the pressure-sensitive adhesive layer 11.
- Examples of the device for applying the adhesive include, for example, Reverse Roll Co., Knife Co., Barco Co., Slot Dieco Co., Air Co., Knife Co. Co., Ltd., River Sgraviaco Co., Ltd., Vario Co., Ltd. Gravureco is one of the best.
- the coating amount of the pressure-sensitive adhesive solution is adjusted so that the thickness of the pressure-sensitive adhesive layer obtained after drying is, for example, in the range of 20 m to 110 m.
- the pressure-sensitive adhesive solution contains the pressure-sensitive adhesive and, if necessary, the additive.
- a solvent for the pressure-sensitive adhesive solution a common organic solvent, for example, toluene, benzene, butyl acetate, ethyl acetate, methyl isobutyl ketone, methyl ethyl ketone, various alcohols, and the like can be used.
- This laminating method may be a generally known method, for example, using a laminating roll, and using the adhesive layer 11 of the laminate and the primer layer 5 of the raw retroreflective sheet (the primer layer 5 is omitted). In this case, they are bonded together so that they face the resin support sheet 4) (see Fig. 8).
- the roll temperature of the laminating roll on the release paper side is set to, for example, 50 ° C to 90 ° C, preferably 55 ° C to 85 ° C, more preferably 60 ° C to 80 ° C.
- the roll temperature is 90 ° C. or less, the cover film 1 of the retroreflective sheet is less likely to be damaged by shrinkage or the like, which is preferable.
- the roll temperature is 50 ° C. or higher, heating is effectively performed, which is preferable.
- the bonding pressure at this time is, for example, 100 N Zcn!
- the groove can be sufficiently filled with the adhesive, and when the laminating pressure is 800 NZcm or less, the pressure of the retroreflective sheet material, such as pressure, may be reduced. Preferred because it does not cause damage.
- the release paper 12 is peeled off.
- many heat-resistant release materials such as the release paper 12 are inferior in flexibility.
- a phenomenon occurs between the retroreflective film and the resin-made release film, such as a partial swelling and peeling like a tunnel. This is preferable because the generation of odor can be suppressed.
- the resin release film having excellent flexibility is as described above.
- the pressure-sensitive adhesive layer 11 can be directly formed on the primer layer 5 of the original retroreflective sheeting, and the resin release film 13 can be disposed on the pressure-sensitive adhesive layer 11.
- the pressure-sensitive adhesive used in this case is preferably a pressure-sensitive adhesive that cures with an electron beam, ultraviolet light, or the like that does not require heating and drying, since the heat resistance of the above-mentioned retroreflective sheet raw material is poor.
- the adhesive layer is cured by irradiating the electron beam or ultraviolet ray onto the adhesive solution or the adhesive layer not diluted with the solution, and then the resin release layer is applied to the adhesive layer 11.
- Lum 13 can be attached.
- a reactor equipped with a stirrer, thermometer, condenser and nitrogen gas inlet was charged with 700 parts of toluene and 300 parts of n-butanol, and heated to 80 ° C under a nitrogen atmosphere. I let it. There, 500 parts of methyl methacrylate, 400 parts of ethyl methacrylate, 100 parts of 2-hydroxyethyl methacrylate, 8 parts of azobisisobutyronitrile and tert-butyl A mixture of 5 parts of oxactoate (TB PO) was added dropwise over 4 hours.
- TB PO oxactoate
- hydroxyl group-containing polyester resin solution (A-4)
- 130 parts of ethylene glycol, 114 parts of neopentyl glycol, and 100 parts of 1,6-hexanediol , 48 parts of trimethyl monopropane, 720 parts of isophthalic acid, and 0.5 part of dibutyltin oxide were charged.
- the temperature of the reactor system was raised to 220 ° C, maintained at the same temperature for 3 hours, further raised to 240 ° C, and dehydrated and condensed at the same temperature for 6 hours. Reacted.
- FIG. 12 The Yamamoto-type cohesive force measuring device shown in FIG. 12 was used. This device has a width of 520, a height of 345 thighs, a depth of 14 O mm, and the adhesive layer of the retroreflective sheet 26 faces downward. A retroreflective sheet 26 was attached to a load pulley 24 and a side pulley 25 via a thread, and loads 22 and 23 were applied to both ends. A jig 32 provided with a core 30 of an electric microscope 31 was placed on the adherend 21 and the retroreflective sheet 26. 27 is a tightening screw, 28 is a micrometer, 29 is a coil, 34 is a display, and 35 is a core holding block.
- FIG. 13 is a schematic perspective view for referring to the connection method between the retroreflective sheet 26 and the yarn of the measuring device of FIG. 36 is a pressing roller, and 37 is a thread.
- a test piece of retroreflective sheet 26 cut to a width of 10 mm was specified in JISG 4305 of 5 mm width.
- a 1 Omm x 5 mm test piece was attached to a mirror-finished flat plate made of steel plate.
- the bonding condition at this time was an automatic type specified in 10.2.2.4 of JISZ0237, and three reciprocations were performed with a roller 36 having a mass of 2 kg at a pressure bonding speed of 5 mm / sec.
- a load of 17 g load 22, 23
- a load of 200 g was applied to load 22 for 5 minutes.
- the displacement (initial displacement) was measured.
- the holding force test was performed based on the holding force test of JISZ0237. Specifically, a SUS304 stainless steel plate was used as the adherend, and the process was performed as follows.
- the retroreflective sheet was pressed against a stainless steel plate by reciprocating a 2 kg rubber roller three times under an atmosphere of a temperature of 23 ⁇ 2 ° C and a relative humidity of 65 ⁇ 5%.
- the attachment area is 25 mm ⁇ 25 mm.
- the stainless steel sheet to which the retroreflective sheet was attached was suspended vertically in a holding force tester set at 40 ° C, and left for 1 hour. After 1 hour, the retroreflective sheet was subjected to a load of 9.8 N (suspended).
- About 25 to 35% of the glass spheres were buried in the glass sphere temporary fixing layer. That is, the glass ball temporary fixing layer and the polyester film were heated and softened, and the above-mentioned glass balls were embedded.
- aluminum was vapor-deposited on the hemispherical surface of the glass sphere exposed from the surface of the glass sphere temporary bonding layer to form a reflecting mirror.
- a separately prepared polyethylene terephthalate (polyester) film 50 m thick) (second film), methyl methacrylate (MMA), ethyl acrylate (EA), butyl acrylate 83 parts by weight of a toluene and butyl acetate solution of an acryl copolymer composed of (BA) and 2-hydroxyethyl methacrylate (2-HEMA) (solid content: 50%), and methyl ether methylol
- a mixed solution with 17 parts by weight of melamine (60% solids) was applied and dried with a hot-air drier to form a primer layer having a thickness of about 2 m.
- a resin-based support sheet having a thickness of about 60 was coated on the primer layer by applying a compounding solution mainly composed of the above-mentioned hydroxyl group-containing acrylic resin solution (A-1) with a hot air drier.
- A-1 hydroxyl group-containing acrylic resin solution
- the composition of the solution is shown below.
- the polyester film is provided on the metal deposition surface side of the glass ball temporary fixing layer.
- a laminate of the lum (second film), the primer layer and the resin support sheet was so arranged that the resin support sheet was in contact with the glass sphere surface of the glass sphere temporary fixing layer.
- the laminate was pressed against the surface of the glass ball temporary fixing layer. This pressing was performed so that the reflecting mirror of a glass ball was embedded in a resin support sheet.
- a heating roll having a roll surface temperature of 170 ° C. was passed through the laminate along which the resin support sheet was placed.
- the polyester film (first film) and the glass ball temporary fixing layer were peeled off from the surface of the resin-made support sheet to obtain a laminate.
- the obtained laminate was subjected to a heat treatment at 140 ° C. in order to improve the adhesion between the glass balls and the resin support sheet.
- a transparent acrylic film uniaxially stretched (substantially unstretched with a draw ratio of 1.3 times) on the glass sphere side of the resin support sheet in which the hemispheres of the glass spheres are embedded [manufactured by Kanekachi Chemical Industry Co., Ltd.] (Strength par film) to obtain a laminate.
- the obtained laminate was heat-formed using a patterned embossing roll having a roll surface temperature of 210 ° C. Then, after the heating and pressurizing embossing process, the polyester film (second film) was peeled off to obtain a retroreflective sheet material.
- Aroset 8964 an acrylic resin with an amide group to which a high softening point tackifier with a solid content of 47% by weight is added as a resin for adhesives (trade name) [Nippon Shokubai Co., Ltd.] 100 parts by weight of a modified polyisocyanate resin "Coronate L-55E” as a curing agent (trade name) [manufactured by Nippon Polyurethane Industry Co., Ltd.] 0.2 parts by weight were stirred and mixed to prepare an adhesive solution. did.
- the pressure-sensitive adhesive solution was applied on hard release paper “EKR-780” (trade name) (manufactured by Lintec Corporation), and dried by heating at 70 ° C for 1 minute and at 100 ° C for 2 minutes.
- An adhesive layer having a thickness of about 80 m was formed.
- the retroreflective sheet raw material The surface of the primer layer and the surface of the pressure-sensitive adhesive layer of the laminate of the release paper and the pressure-sensitive adhesive layer are bonded together at a bonding pressure of 450 NZcm and a roll surface temperature of 70 ° C, and are heated and embossed.
- the grooves formed in the primer layer by processing were filled with a part of the adhesive layer.
- a flexible polypropylene (PP) release film “Film Binner PP_S—80” (trade name) [Fujimori Kogyo Co., Ltd., thickness 80 ⁇ m, Young's modulus 80 0 MPa] (resin release film) to obtain a retroreflective sheet laminate.
- the obtained retroreflective sheet laminate was aged for 7 days at 23 ⁇ 2 ° C and a relative humidity of 65 ⁇ 5%.
- Example 2 The same procedure as in Example 1 was repeated except that the composition of the compound solution for the resin-made support sheet was changed as follows, and the heat treatment after embedding the glass spheres in the resin-made support sheet was omitted. A stock was made.
- An adhesive layer was formed in the same manner as in Example 1 except that 1 part by weight was used. A laminate was obtained. Then the same conditions as in Example 1 Aging was carried out.
- the composition of the compounding solution for the resin support sheet was changed to the following, the thickness of the resin support sheet was changed from 60 to 80 m, and the glass balls were embedded in the resin support sheet.
- a raw retroreflective sheeting was obtained in the same manner as in Example 1, except that a one-month aging step at 30 was newly added.
- Polyester resin (A-4) (solid content: 50%) 100 parts
- HMD I isocyanurate (solid content: 75%, NCO: 15%) 2.5 parts
- Example 1 was repeated except that the preparation of the primer layer was omitted, the composition of the composition solution for the resin support sheet was changed to the following, and the thickness of the resin support sheet was changed from 60 xm to 80. In the same manner as described above, an original sheet of a retroreflective sheet was obtained.
- Acrylic resin solution ( ⁇ '-1) solid content: 50%) 100 parts
- Example 2 An adhesive layer was formed in the same manner as in Example 2 except that 5.5 parts of “E-05C” (trade name) (manufactured by Soken Chemical Co., Ltd.) was used as a curing agent. A reflective sheet laminate was obtained. Thereafter, aging was performed under the same conditions as in Example 1. Comparative Example 1
- a raw retroreflective sheet was obtained in the same manner as in Example 1, and an adhesive layer was formed by the following method.
- Aloset HI_81D, an alkyl acrylate copolymer resin having an interpenetrating polymer network structure with a solid content of 39% by weight as a resin for adhesives (trade name) [Nippon Shokubai Co., Ltd.] 100 Parts by weight and curing agent "Coronet L-55E" (trade name) [manufactured by Nippon Polyurethane Industry Co., Ltd.] 1. 2 parts by weight were stirred and mixed to prepare an adhesive solution.
- the pressure-sensitive adhesive solution was applied on hard release paper and dried to form a pressure-sensitive adhesive layer having a thickness of about 80 m.
- the surface of the primer layer of the retroreflective sheeting material and the surface of the pressure-sensitive adhesive layer of the laminate of the release paper and the pressure-sensitive adhesive layer were bonded at a pressure of 450 NZcm and a roll surface temperature of 70 ° C.
- the groove formed in one layer of the primer by the heat and pressure embossing was filled with a part of the pressure-sensitive adhesive layer.
- An original retroreflective sheeting was obtained in the same manner as in Example 1. Then the adhesive Acrylic resin having a carboxylic acid as a functional group having a solid content of 40% by weight and having chlorinated ⁇ and ⁇ grafted thereon, “AROSET II I-91 D-3” (trade name) (trade name) 100 parts by weight of Nippon Shokubai] and 100 parts by weight of curing agent “Coronet L-155” (trade name) [manufactured by Nippon Polyurethane Industry Co., Ltd.] A solution was prepared.
- a retroreflective sheet laminate was obtained in the same manner as in Comparative Example 1, except that the pressure-sensitive adhesive solution was applied on a hard release paper and dried to form a pressure-sensitive adhesive layer having a thickness of about 40 im. Thereafter, aging was performed under the same conditions as in Example 1. Comparative Example 3
- An original retroreflective sheeting was obtained in the same manner as in Example 1. Then, an acrylic / vinyl acetate copolymer resin “Sipinol AT—208” (trade name) [made by Saiden Chemical Co., Ltd.] of 100 parts by weight and a curing agent was used as an adhesive resin. N, N, N ', N'-tetraglycidyl-2.2% solution of m-xylylenediamine (toluene 91.9%, IPA 5.9%) "A-1 9" (trade name) [Siden Chemical A retroreflective sheet laminate was obtained in the same manner as in Comparative Example 2 except that 1 part by weight was used. Thereafter, aging was performed under the same conditions as in Example 1.
- Tables 1 and 2 show the physical property values of the obtained retroreflective sheet laminate.
- “thickness of the pressure-sensitive adhesive layer” means “thickness of the pressure-sensitive adhesive layer in a portion of the back surface side of the resin-made support sheet where no groove is formed”.
- the filling rate of the pressure-sensitive adhesive layer is 70 to 100%.
- the filling rate of the pressure-sensitive adhesive layer is less than 50 to 70%.
- the filling rate of the pressure-sensitive adhesive layer is less than 50%.
- X Abnormalities such as blemishes, blisters, bubbles, and peeling are observed on the surface of the retroreflective sheeting.
- a KIWALITE Hand Squeeze Roll Applicator HSA2-130 with a nip roll hardness of 60 (hardness tester: measured with fIS K 6301 A type), rubber thickness of 10 mm, diameter of 110 mm, rubber surface length of 1270 mm
- a retroreflective sheet was attached to an aluminum plate (thickness: 1 mm) of 650 mmX100 mm to produce a test specimen, and the specimen immediately after bonding and left in a 60 ° C atmosphere for 24 hours The appearance of the retroreflective sheet surface of the specimen was observed.
- the sticking pressure when using the above Hand Squeeze Roll Applicator HSA2-130 was 0.4 Mpa as a result of measurement with a KIWALITE Pressure Scaling Film.
- the sticking pressure when using the above Hand Squeeze Roll Applicator HSA2-130 was 0.1 Mpa or less as a result of measurement with a KIWALITE Pressure Sealing Film.
- a KIWALITE Hand Squeeze Roll with a nip roll hardness of 60 (measured with a hardness meter JISK 6301 mm), a rubber thickness of 10 mm, a diameter of 110 mm, and a rubber surface length of 127 mm
- a 340 mm ⁇ 660 mm retroreflective sheet was bonded at a position 100 mm from section A of the substrate.
- the appearance of the test piece sheet surface after standing for 24 hours was observed.
- the sticking pressure when using the Hand Squeeze Roll Applicator HSA2-130 described above was 0.4 MPa as a result of measurement using a KIWALITE Pressure Sealing Film.
- the groove on the back side of the resin-made support sheet formed by heat-press embossing is filled with a part of the pressure-sensitive adhesive layer, and the residual pressure-sensitive adhesive layer remains.
- rate and fall time were within the specified ranges, no irregularities such as blemishes, blisters, bubbles, and peeling were observed on the surface of the retroreflective sheet, confirming that the problems of the conventional product could be improved.
- the retroreflective sheet of the present invention is a retroreflective sheet that prevents appearance abnormalities such as blemishes and blisters that occur with time after being attached to a substrate, and includes road signs, guide signs, safety guidance sign display boards, Or it is useful as other safety signs.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laminated Bodies (AREA)
- Optical Elements Other Than Lenses (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Road Signs Or Road Markings (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60329217T DE60329217D1 (de) | 2002-11-27 | 2003-11-10 | Retroreflektierende folie |
AU2003277661A AU2003277661C1 (en) | 2002-11-27 | 2003-11-10 | Retroreflective Sheet |
US10/534,412 US7906193B2 (en) | 2002-11-27 | 2003-11-10 | Retroreflective sheet |
AT03811892T ATE442247T1 (de) | 2002-11-27 | 2003-11-10 | Retroreflektierende folie |
EP03811892A EP1566261B1 (en) | 2002-11-27 | 2003-11-10 | Retroreflective sheet |
HK06104852A HK1084640A1 (en) | 2002-11-27 | 2006-04-24 | Retroreflective sheet |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002344597 | 2002-11-27 | ||
JP2002-344597 | 2002-11-27 |
Publications (1)
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WO2004048079A1 true WO2004048079A1 (ja) | 2004-06-10 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/014288 WO2004048079A1 (ja) | 2002-11-27 | 2003-11-10 | 再帰性反射シート |
Country Status (11)
Country | Link |
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US (1) | US7906193B2 (ja) |
EP (1) | EP1566261B1 (ja) |
KR (1) | KR100667679B1 (ja) |
CN (1) | CN100339212C (ja) |
AT (1) | ATE442247T1 (ja) |
AU (1) | AU2003277661C1 (ja) |
DE (1) | DE60329217D1 (ja) |
HK (1) | HK1084640A1 (ja) |
TW (1) | TWI288702B (ja) |
WO (1) | WO2004048079A1 (ja) |
ZA (1) | ZA200501967B (ja) |
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US20220127433A1 (en) * | 2020-10-22 | 2022-04-28 | Potters Industries, Llc | Durable retroreflective optical elements |
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- 2003-11-10 EP EP03811892A patent/EP1566261B1/en not_active Expired - Lifetime
- 2003-11-10 CN CNB200380104490XA patent/CN100339212C/zh not_active Expired - Fee Related
- 2003-11-10 AU AU2003277661A patent/AU2003277661C1/en not_active Ceased
- 2003-11-10 DE DE60329217T patent/DE60329217D1/de not_active Expired - Lifetime
- 2003-11-10 WO PCT/JP2003/014288 patent/WO2004048079A1/ja active IP Right Grant
- 2003-11-10 KR KR1020057006257A patent/KR100667679B1/ko active IP Right Grant
- 2003-11-10 US US10/534,412 patent/US7906193B2/en not_active Expired - Fee Related
- 2003-11-11 TW TW092131451A patent/TWI288702B/zh not_active IP Right Cessation
-
2005
- 2005-03-08 ZA ZA200501967A patent/ZA200501967B/xx unknown
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2006
- 2006-04-24 HK HK06104852A patent/HK1084640A1/xx not_active IP Right Cessation
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Also Published As
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AU2003277661A1 (en) | 2004-06-18 |
EP1566261A4 (en) | 2008-02-27 |
AU2003277661C1 (en) | 2005-12-08 |
ZA200501967B (en) | 2006-11-29 |
EP1566261B1 (en) | 2009-09-09 |
CN1717318A (zh) | 2006-01-04 |
KR20050050129A (ko) | 2005-05-27 |
TW200419479A (en) | 2004-10-01 |
KR100667679B1 (ko) | 2007-01-12 |
TWI288702B (en) | 2007-10-21 |
EP1566261A1 (en) | 2005-08-24 |
CN100339212C (zh) | 2007-09-26 |
US7906193B2 (en) | 2011-03-15 |
DE60329217D1 (de) | 2009-10-22 |
US20060057323A1 (en) | 2006-03-16 |
AU2003277661B2 (en) | 2005-06-23 |
HK1084640A1 (en) | 2006-08-04 |
ATE442247T1 (de) | 2009-09-15 |
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