EP0863956A1 - Feuille adhesive et structure qui l'utilise - Google Patents

Feuille adhesive et structure qui l'utilise

Info

Publication number
EP0863956A1
EP0863956A1 EP96942061A EP96942061A EP0863956A1 EP 0863956 A1 EP0863956 A1 EP 0863956A1 EP 96942061 A EP96942061 A EP 96942061A EP 96942061 A EP96942061 A EP 96942061A EP 0863956 A1 EP0863956 A1 EP 0863956A1
Authority
EP
European Patent Office
Prior art keywords
adhesive
ofthe
layer
microspheres
adhesive sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96942061A
Other languages
German (de)
English (en)
Inventor
Hidetoshi Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0863956A1 publication Critical patent/EP0863956A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F13/00—Coverings or linings, e.g. for walls or ceilings
    • E04F13/07—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor
    • E04F13/08—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements
    • E04F13/0885—Coverings or linings, e.g. for walls or ceilings composed of covering or lining elements; Sub-structures therefor; Fastening means therefor composed of a plurality of similar covering or lining elements specially adapted for being adhesively fixed to the wall; Fastening means therefor; Fixing by means of plastics materials hardening after application
    • E04F13/0887—Adhesive means specially adapted therefor, e.g. adhesive foils or strips
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous

Definitions

  • the present invention relates to an adhesive sheet which comprises elastic microspheres in an adhesive layer and is adhered to a substrate having an uneven surface, a method for producing such adhesive sheet, and a structure having an adhered adhesive sheet.
  • the present invention relates to an adhesive sheet which has a good adhering property when it is adhered to a substrate exposed outdoors such as an outer wall of a building of mortar or concrete.
  • adhesive sheets (a) to (d) are known as adhesive sheets (also known as adhesive films) such as a decorative sheet or a retroreflective sheet, which are adhered to a substrate having an uneven surface such as a wall, for example:
  • An adhesive sheet disclosed in Japanese Patent Publication JP-A-2- 32180 comprises a backing layer which comprises a nonwoven fabric and a flexible resin, and an adhesive coated on said backing layer.
  • This adhesive sheet intends to improve a follow-up property ofthe sheet to the uneven surface of the substrate by the use ofthe above backing layer having good flexibility.
  • a porous substrate such as mortar or concrete materials and used outdoors
  • water or vapor containing water which is absorbed by the substrate migrates to an interface between the adhesive layer and the substrate, but cannot escape from the interface, whereby the adhesive layer and in turn the adhesive sheet is blistered by an osmotic pressure. Since the surface ofthe substrate is very rough, it is difficult to decorate the surface by, for example, printing.
  • a repeelable adhesive tape disclosed in Japanese Patent Publication JP-U-572946 comprises a backing layer, a viscoelastic layer formed on the backing layer, and an adhesive layer which contains microspheres and is formed on said viscoelastic layer.
  • This adhesive tape intends to improve the following-up property to the uneven surface ofthe substrate by the function ofthe viscoelastic layer But, since an average particle size ofthe microspheres is as small as 1 to 10 ⁇ m, the tape has insufficient adhesion force to a substrate surface having relatively large unevenness such as the mortar or concrete material In addition, since the viscoelastic layer is additionally formed, the production steps may be complicated
  • a degree of unevenness is expressed by a surface roughness, and is defined in Japanese Industrial Standards JIS B 0601 (1994) When an arithmetical average surface roughness (Ra) measured at a cut-off value of 8 mm and an evaluated length of 40 mm is about 20 to 100 ⁇ m, a surface is ranked as "a surface having a relatively large degree of unevenness” or "a rough surface”
  • a pressure sensitive adhesive sheet disclosed in Japanese Patent Publication JP-A-7-3222 and Japanese Patent Publication JP-A-7-48549 comprises, in general, a pressure sensitive adhesive layer which is photocured, and microspheres surfaces of which are treated to lower their surface energy and which are contained in said layer
  • This pressure sensitive sheet intends to improve its following-up property to the uneven surface ofthe substrate by surface treating nontacky microspheres having an average diameter of 5 to 200 ⁇ m to make mobility ofthe microspheres in the pressure sensitive layer easy when the sheet is adhered
  • the microspheres are embedded in the adhesive layer and do not form convex parts, the adhesion ofthe sheet to the uneven surface cannot be improved
  • An adhesive tape disclosed in Japanese Patent Publication JP-U-1- 70848 comprises a backing layer tape and an adhesive which is formed on the backing layer in a relatively regular uneven pattern such as a net pattern But, the formation ofthe regular pattern is difficult, and a contact area is not increased effectively on the substrate the surface unevenness of which is not necessarily regular, such as the mortar or concrete material
  • 287525 comprises a film backing and an adhesive layer which is formed on said film and comprises tacky elastic microspheres having a volume average diameter of 100 to 300 ⁇ m and an adhesive, whereby an air trapped between the film and a flat surface of a substrate can escape when the adhesive film is adhered to the substrate.
  • the microspheres are contained in the adhesive discretely or in a "cluster state" (which will be defined later) in which the microspheres are dispersed in the form of minute bulks consisting of two or more agglomerated microspheres.
  • a repeelable adhesive material disclosed in Japanese Patent Publication JP-A-6172739 contains only tacky microspheres having an average particle size of 1 to 200 ⁇ m, or such tacky microspheres and a nontacky binder This adhesive material does not have a film-form backing, and the formation of clusters ofthe elastic microspheres is not suggested. Since a production method of this adhesive material does not include any means for coating the adhesive material directly on a backing, formation of clusters of tacky microspheres is very difficult
  • the conventional adhesive sheets do not have sufficient adhesion force on the substrate having a rough surface having a relatively large degree of unevenness, and irregular shape and configuration ofthe unevenness such as the mortar or concrete material As the results, the adhesive sheet tends to peel off from the substrate as the time passes. Since the mortar and concrete materials are water absorbing porous materials, when the adhesive sheet is adhered thereto, vapor containing water which penetrated in the substrate migrates to the adhesion interface to cause the blister of the adhesive layer As the result, the adhesive layer tends to peel off from the substrate
  • one aspect ofthe present invention provides an adhesive sheet which can maintain a sufficient adhesion force on a substrate having a relatively large degree of unevenness and irregular shape and configuration of unevenness and comprising a water-absorbing porous material such as a mortar or concrete material, and can prevent blister of an adhesive layer caused by vapor containing water which migrates from the inside ofthe substrate to an adhesion interface
  • Another aspect ofthe present invention provides a method for producing an adhesive sheet which can form clusters of elastic microspheres useful in the adhesive sheet
  • An adhesive sheet ofthe invention comprises a backing layer, and an adhesive layer which is formed on said backing layer and contain tacky elastic microspheres wherein a) said adhesive layer has convex adhesive parts containing one or more clusters of at least two said elastic microspheres and said, and b) a contact area rate between said adhesive layer and a plate surface is from 20 to 90 % when said contact area rate is measured by adhering said adhesive sheet to a flat glass plate surface under the pressure of 2 kg/25 cm 2
  • Fig 1 schematically shows the adhesive sheet having the clusters of microspheres according to the present invention
  • FIG 1 An adhesive sheet of the invention is schematically shown in Fig 1
  • the adhesive sheet 1 has discrete adhesive parts 3 containing the convex clusters ofthe microspheres 2 Since the convex adhesive parts contain the cluster or clusters of the elastic microspheres, sufficient adhesive force is attained even on a substrate having a rough surface such as the mortar or concrete material
  • Tacky elastic microsphere and "microsphere” mean particles having a volume average diameter of less than 500 ⁇ m and at least a surface of which has tackiness, and exhibits rubbery elasticity as a whole
  • the rubbery elasticity ofthe microspheres is necessary for the increase ofthe adhesion force ofthe adhesive layer to the uneven surface and the formation ofthe passageways which prevent the blister ofthe adhesive layer.
  • the microspheres themselves make it easy and sure to form the cluster structure, and improve the adhesion force ofthe adhesive layer to the uneven surface
  • Cluster of elastic microspheres means an agglomerate ofthe elastic microspheres which are dispersed in a bulk form of two or more ofthe microspheres in a matrix ofthe tacky polymer to form a convex adhesive part having an irregular shape and irregular configuration That is, the adhesive layer comprises "island” parts (discrete phases) comprising the cluster(s) and the tacky polymer, and relatively flat “sea” parts (continuous parts) comprising the tacky polymer but no cluster
  • Adhesive layer means is a layer comprising microspheres and tacky polymer, and having plural convex adhesive parts with the irregular shapes
  • Tacky polymer means a polymer which has tackiness at room temperature and can be used as a pressure-sensitive adhesive
  • Each convex adhesive part comprises an agglomerate ofthe elastic microspheres which are arranged in a two-dimensional plane, an agglomerate ofthe elastic microspheres which are three dimensionally arranged, or both
  • the agglomerated elastic microspheres in the cluster are shifted to deform the convex adhesive part in a shape which is suitable to be adhered to the uneven surface ofthe substrate
  • a degree of this deformation should be configured so that passageways which communicate with the atmosphere are formed and maintained between the uneven surface and the adhesive layer The degree ofthe deformation can be controlled by the tackiness of the elastic microspheres, and the inclusion ofthe elastic microspheres and the tacky polymer in a specific ratio.
  • the irregular shape ofthe convex adhesive part serves to improve the adhesion ofthe adhesive layer to the substrate having the irregular uneven surface
  • the irregular shape ofthe convex adhesive part is derived from the irregularly shaped and arranged cluster ofthe elastic microspheres
  • the cluster ofthe elastic microspheres can be formed by coating an adhesive coating composition on a coating surface ofthe backing layer having a specific wetting index to form the adhesive layer
  • the cluster formation may be accelerated by controlling a viscosity ofthe adhesive coating composition in a specific range
  • the above described "sea-island" structure serves to provide passageways which are formed by the substrate surface and the adhesive layer and communicate with the atmosphere, whereby the blister ofthe adhesive layer caused by the vapor containing water which migrates from the substrate is prevented.
  • a contact area rate between the adhesive layer and a flat glass surface which specifies a degree of contact between them and will be defined later, is adjusted in the specific range, when it is measured by adhering the adhesive sheet to the flat glass surface.
  • the contact area rate is easily regulated by maintaining the ratio ofthe elastic microspheres to the tacky polymer in the specific range, using the elastic microspheres having the specific average particle size, and adjusting a coating weight ofthe adhesive layer in a specific range
  • microspheres for the present invention have a volume average diameter from 10 to 300 ⁇ m, preferably from 50 to 250 ⁇ m
  • the adhesive layer follows the uneven surface very well, an apparent contact area rate increases, and consequently the sufficient adhesion force is achieved
  • the volume average diameter is obtained by measuring diameters of 1000 microspheres using an optical microscope and an image analyzer, and calculating an average value according to the following equation
  • volume average diameter ( ⁇ m) ⁇ (d, 4 x n,)/ ⁇ (d, 3 x n,) wherein d, is a diameter ( ⁇ m) of a microsphere having an i-th largest diameter, and n, is the number of microspheres having the diameter d,
  • the microsphere may be solid or hollow having at least one void therein Polyacrylate is preferred as a material for the microspheres, since it is readily available, and its rubbery elasticity and tackiness are easily controlled
  • a compressive modulus ofthe microsphere is preferably in the range between 1 x IO 4 and 1 xlO 6 dyne/cm 2 When the compressive modulus is in this range, the microspheres themselves and/or their clusters are effectively deformed, and the adhesive layer is effectively adhered to the uneven surface
  • the compressive modulus is measured using a RSA 1 1 viscoelastic spectrometer (manufactured by RHEOMETRIX) at 20°C That is, temperature dependency ofthe modulus is measured by changing temperature from -80°C to 150°C with applying a compression strain having a frequency of 1 rad/sec , and a measured value at 20°C is used as the compressive modulus
  • the microspheres may be produced by any of known methods such as suspension polymerization, emulsion polymerization, seed polymerization, and so on
  • a method for producing the microspheres of polyacrylate by emulsion polymerization will be explained briefly
  • a reactor equipped with a mechanical stirrer, deionized water, an acrylic monomer, a radical polymerization initiator, and other optional additives are added, and an interior ofthe reactor is purged with an inert gas Then, the reactor is heated to a specific temperature to initiate polymerization ofthe monomer while stirring
  • a stirring rate is from 10 to 700 rpm
  • a reaction temperature is from 30 to 120°C
  • a reaction time is usually from several hours to several ten hours
  • the acrylic monomer a mixture of an alkyl acrylate (e g isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, etc ) and an acrylic unsaturated acid (e g acrylic
  • the produced microspheres are isolated by filtration and used in general, while the as-produced aqueous dispersion containing the microspheres after the reaction can be used, and the tacky polymer is added to the dispersion to obtain the adhesive coating composition
  • Tacky polymers such as polyacrylates, polyurethanes, polyolefins, polyesters, and so on may be used As in the case of conventional pressure-sensitive adhesives, a tackifier may be used in combination with the tacky polymer
  • a molecular weight ofthe tacky polymer is in a range in which the desired tackiness is achieved In general, a weight average molecular weight is from 10,000 to 100,000
  • the irregular shaped convex adhesive parts achieve the development of good adhesion to the uneven surface, and the formation ofthe passageways which communicate with the atmosphere and prevents the blister ofthe adhesive layer
  • a mixing ratio ofthe microspheres to the tacky polymer is preferably from 20 to 500 wt parts, more preferably from 100 to 400 wt parts ofthe former per lOO wt parts of the latter
  • the amount ofthe former is less than 20 wt parts, it is difficult to form the cluster (which will be explained later) having an effective size, while it exceeds 500 wt parts, it may be difficult to form the passageways which communicate with the atmosphere between the uneven surface and the adhesive layer so that the prevention ofthe blister ofthe adhesive layer due to water and so on will be difficult
  • any conventional material can be used as a backing layer
  • a sheet of paper, a meta! film, a plastic film and so on can be used as the plastic film
  • a synthetic polymer such as polyvinyl chloride, polyester, polyurethane, polyacrylate, etc can be used
  • a thickness ofthe film is usually from 10 to 1500 ⁇ m
  • a surface ofthe backing layer on which the adhesive layer is formed may be surface treated to increase the bond force ofthe adhesive layer to the backing layer, or to control the wetting index which will be explained later
  • the cluster comprises at least two microspheres
  • the cluster having a size effective to the preferred adhesion property contains 10 to 200 microspheres
  • a percentage ofthe clusters having such effective size in the whole adhesive layer is preferably at least 80 % of all the clusters
  • the formation, shape and size ofthe clusters ofthe microspheres in the adhesive layer can be confirmed by the observation by an optical microscopy using reflected light, at a magnification of 10 to 100 times
  • One of suitable methods for forming the clusters comprises adjusting the wetting index on the coating surface ofthe backing layer in the range between 35 and 70 dyne/cm 2 , coating the adhesive coating composition on the coating surface and drying it to form the adhesive layer
  • the preferred wetting index is from 40 to 60 dyne/cm 2
  • the wetting index ofthe backing layer can be adjusted by the surface treatment ofthe backing layer such as corona treatment, plasma treatment, chemical treatment, etc
  • its wetting index can be adjusted by a kind and an amount of an additive such as a plasticizer which is contained in the plastic film
  • the corona discharge treatment is preferred, since contamination ofthe adhesive layer by the chemical can be avoided in comparison with the chemical treatment
  • a discharge energy is generally from 0 1 to 3 kW
  • a discharge frequency is from 5000 to 35,000 Hz
  • the corona discharge can be carried out in the air or an atmosphere of, for example, nitrogen
  • a solution of an acid, an alkali or an organic amine, or (2) a solution of a trichloroacetic acid or a phenol compound can be used as a chemical
  • Such chemical is applied on the coating surface ofthe backing layer, optionally heated, and dried
  • the wetting index is measured by a wetting test method according to JIS 6768 (1977) at 23 ⁇ 2°C, 50 ⁇ 5 %RH
  • the control ofthe viscosity of the adhesive coating composition is also advantageous for the easy formation ofthe clusters
  • the viscosity ofthe adhesive coating composition is from 100 to 6000 cps
  • the viscosity is lower than 100 cps, the adhesive layer having a sufficient coating weight may not be formed, while it is higher than 6000 cps, the adhesive layer in which the microspheres are uniformly arranged tends to be formed, so that the effective clusters may not be formed
  • the mixing ratio ofthe microspheres to the tacky polymer, and the tackiness of the microspheres may be the factors which control the formation ofthe effective clusters
  • a coating weight suitable for the formation ofthe effective clusters is from 5 to 150 g/m 2 , more preferably from 50 to 100 g/m2 7 Contact Area Rate
  • the contact area rate it is necessary to maintain a ratio ofthe real contact area to the apparent contact area between the adhesive layer and the substrate, that is, the contact area rate, in a specific range for achieving both the high adhesion force to the uneven surface, and the prevention ofthe blister ofthe adhesive layer when the adhesive sheet is adhered to the substrate having the porous surface
  • the contact area rate is defined by a contact area percentage between the adhesive layer and a flat surface which is measured by adhering the adhesive sheet to a flat surface of a glass plate
  • the adhesive layer ofthe adhesive sheet is adhered to a flat surface of a glass plate such as a slide glass and pressed by a roller of 2 kg by reciprocating it over the adhesive sheet one time
  • a glass plate such as a slide glass
  • the reflected light is observed through a polarized light filter
  • domains in which the convex adhesive parts and the glass surface are contacted are seen dark, while non-contact domains are seen white
  • a photograph of such observed state is taken, and a total area ofthe contact domains and the area of the whole observed field (corresponding to the apparent contact area) are measured, and their ratio (the total area ofthe contact domains/the area ofthe whole observed field) is expressed in "percentage", which is used as the contact area rate"
  • the above measurement can be done using an optical microscope equipped with a Polaroid camera In this case, the area ofthe observed field is usually 1 cm 2 A surface roughness Ra ofthe used glass plate is 0 1 ⁇ m or less
  • the contact area rate measured as above is preferably from 20 to 90 % more preferably from 40 to 80 %, in particular from 50 to 70 %
  • the contact area rate in this range can achieve both the adhesive property ofthe adhesive sheet to the uneven surface and the effective formation ofthe passageways which escape the vapor containing water trapped between the adhesive sheet and the substrate
  • the contact area rate increases, as the size ofthe microspheres decreases or the coating weight ofthe adhesive layer increases, while it decreases as the content ofthe microspheres in the tacky polymer increases Accordingly, the contact area rate can be controlled in the above range by adjusting these parameters in the desired ranges
  • the adhesive sheet ofthe present invention can be produced by coating the adhesive coating composition on one or both ofthe surfaces ofthe backing layer, and drying it to form the adhesive layer In this method, the clusters are effectively formed by the use ofthe above described measures
  • the adhesive coating composition is prepared by mixing the microspheres, the tacky polymer, the solvent, and optional additives in a mixing apparatus such as a homomixer, a planetary mixer, etc. to obtain a mixture in which all the components are homogeneously dispersed
  • a mixing apparatus such as a homomixer, a planetary mixer, etc.
  • the prepared coating composition is coated on the backing layer, and dried to form the adhesive layer
  • Any conventional means such as a knife coater, a roll coater, a die coater, a bar coater, and so on can be used
  • the drying is carried out at a temperature of 60 to 180°C
  • a drying time is usually from several ten seconds to several minutes
  • the solvent water or an organic solvent may be used
  • an aqueous coating composition is suitable In this case, the drying temperature is usually 100°C or higher
  • a co-solvent which is partly miscible with water may be added Examples of useful co-solvent are alkylene glycol monoalkyl ether esters such
  • the adhesion layer After the formation ofthe adhesion layer, it may be coated with a silicone- treated liner for the protection of the adhesion layer 9 Adhesive Sheet
  • the adhesive sheet ofthe present invention can be used as a decorative sheet and adhered to a wall, a floor, or a ceiling of a building
  • the adhesive sheet ofthe present invention is useful, when the surface is covered with a mortar, a concrete, or a wall paper, and has a large degree of unevenness the shape and size of which are irregular
  • the adhering surface of the adhesive layer of the adhesive sheet according to the present invention has many convex adhesive parts containing the clusters of the microspheres, when it is adhered to the substrate, the surface ofthe substrate and the adhering surface are spot adhered to form continuous passageways Since the adhesive sheet of the present invention has such structure, it can remove water which migrated in the substrate from outside through the passageways into the atmosphere, when the adhesive sheet is adhered to the porous substrate which absorbs water Therefore, the blister of the adhesive layer caused by such water can be prevented If the blister reaches the backing layer, appearance of the adhered sheet is deteriorated, and the blister causes the peeling off of the sheet from the substrate Therefore, the adhesive sheet of the present invention is very useful when it is used on the substrate which is exposed outdoors such as the outer wall ofthe building made of the mortar or concrete
  • the adhesive sheet ofthe present invention has the much larger adhesion force to the mortar surface than the conventional adhesive sheets, for example, 2 kg/2 5 cm or larger), and seldom suffers from the generation of the blister of the adhesive layer caused by
  • the elastic microspheres were produced by the suspension polymerization in water as a medium
  • a monomer composition contained IOA (isooctyl acrylate) and AA (acrylic acid) in a weight ratio of 96 4
  • a volume average diameter in each Example is shown in Table 1
  • the compressive modulus was adjusted to 7 x 10 5 dyne/cm 2 for all the diameters of the microspheres
  • the compressive modulus was measured under the above described measuring conditions with a sample which was produced by removing the solvent from the suspension containing the microspheres, molding them in a cylindrical sample with a diameter of 5 mm and a height of 7 mm, and attached to parallel plate jigs Tacky Polymer
  • an aqueous dispersion tackifier El 000 manufactured by SOKEN CHEMICAL Co , Ltd was used, which had a monomer composition of butyl acrylate and acrylic acid in a weight ratio of 94 6
  • a backing layer was a polyvinyl chloride film of 70 ⁇ m in thickness having a polyester carrier of 50 ⁇ m in thickness
  • This backing layer was produced by casting a solution of a homopolymer of vinyl chloride Its coating surface was treated by corona discharge to adjust its wetting index to a value in Table 1
  • the microspheres of the weight parts shown in Table 1 was added, and mixed by a homomixer, and the mixture was coated on the backing layer film with a knife coater so as to achieve the coating weight of Table 1 after drying After drying it at 105°C for 5 minutes, a silicone liner (PD 530 BH manufactured by TOKUSHU SEISHI) was laminated to obtain a liner-laminated adhesive sheet
  • Comparative Examples 1 and 2 conventional products were used That is, SCOTCHCAL film UPF-1 (manufactured by 3M) and FARAON sheet (manufactured by FARAON) were used in Comparative Examples 1 and 2, respectively Both are commercially sold as concrete masking films With each ofthe adhesive sheets, the following properties were measured Contact Area Rate
  • the adhesive sheet of 10 cm x 10 cm was placed on a flat acrylate plate, and squeezed by a squeezer towards the center ofthe adhesive sheet to gather bubbles A roller of 2 kg was rolled over the bubbles several times, and a degree ofthe bubble escape was observed When all the bubbles escaped, the sheet was ranked “Good", while when a part of bubbles remained, the sheet was ranked "Bad" Adhesion Force
  • a viscosity of each adhesive coating composition before coating was measured by a B-type viscometer (Spindle No 4) at 23°C at a rotation speed of 60 ⁇ m

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Finishing Walls (AREA)
  • Laminated Bodies (AREA)
  • Medicinal Preparation (AREA)

Abstract

L'invention concerne une feuille adhésive comprenant une couche de support et une couche adhésive formée sur la couche de support, contenant des microsphères élastiques adhésives et un polymère adhésif, où (a) la couche adhésive a des parties adhésives convexes contenant un ou plusieurs agrégats d'au moins deux microsphères élastiques et le polymère adhésif et (b) la surface de contact relative entre la couche adhésive et une surface plate est située entre 20 et 90 % quand la surface de contact relative est mesurée en faisant adhérer la feuille adhésive à une surface de verre plate sous une pression de 2 kg/25 cm2. L'invention concerne également une structure ayant une feuille adhésive collée, comprenant un article en mortier ou en ciment avec une surface rugueuse et la feuille adhésive collée à la surface rugueuse, et ayant des passages qui sont formés par la surface et une couche adhésive de la feuille adhésive et qui communiquent avec l'atmosphère.
EP96942061A 1995-12-01 1996-11-25 Feuille adhesive et structure qui l'utilise Withdrawn EP0863956A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7314043A JPH09157606A (ja) 1995-12-01 1995-12-01 粘着シート、その製造方法および粘着シート貼付構造
JP314043/95 1995-12-01
PCT/US1996/018887 WO1997020008A1 (fr) 1995-12-01 1996-11-25 Feuille adhesive et structure qui l'utilise

Publications (1)

Publication Number Publication Date
EP0863956A1 true EP0863956A1 (fr) 1998-09-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96942061A Withdrawn EP0863956A1 (fr) 1995-12-01 1996-11-25 Feuille adhesive et structure qui l'utilise

Country Status (6)

Country Link
EP (1) EP0863956A1 (fr)
JP (1) JPH09157606A (fr)
KR (1) KR19990071810A (fr)
AU (1) AU1123697A (fr)
BR (1) BR9611787A (fr)
WO (1) WO1997020008A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6294250B1 (en) 1996-08-28 2001-09-25 3M Innovative Properties Company Adhesive film and method for producing the same
JP4034866B2 (ja) * 1998-01-05 2008-01-16 スリーエム カンパニー 粘着シートおよびその製造方法
JP2000186254A (ja) * 1998-10-14 2000-07-04 Minnesota Mining & Mfg Co <3M> 接着シートおよび接着構造
US6630218B1 (en) 1998-12-21 2003-10-07 3M Innovative Properties Company Adhesive sheet and method for producing the same
US6656567B1 (en) 1999-04-30 2003-12-02 3M Innovative Properties Company Adhesive sheet and adhesive sheet applied structure
JP5933957B2 (ja) * 2011-10-21 2016-06-15 スリーエム イノベイティブ プロパティズ カンパニー グラフィックスフィルム前駆体
JP2015203099A (ja) * 2014-04-16 2015-11-16 積水化学工業株式会社 コンクリート又はモルタル接着用両面テープ用粘着剤組成物、コンクリート又はモルタル接着用両面テープ及びコンクリート又はモルタル接着用両面テープの製造方法
JP6587883B2 (ja) * 2015-09-28 2019-10-09 リンテック株式会社 粘着シートおよび粘着シートの製造方法
JP6874993B2 (ja) * 2015-09-28 2021-05-19 リンテック株式会社 粘着シート、及び粘着シートの製造方法
JP7141026B2 (ja) * 2015-09-28 2022-09-22 リンテック株式会社 粘着シート、及び粘着シートの製造方法
JP7164307B2 (ja) 2017-04-10 2022-11-01 スリーエム イノベイティブ プロパティズ カンパニー 粘着シート及び粘着シートを粗面に適用する方法
WO2018189626A1 (fr) 2017-04-10 2018-10-18 3M Innovative Properties Company Feuille adhésive et procédé d'application d'une feuille adhésive sur une surface rugueuse
JP7107779B2 (ja) 2018-08-03 2022-07-27 スリーエム イノベイティブ プロパティズ カンパニー 建築部材
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JP2022016080A (ja) * 2020-07-10 2022-01-21 スリーエム イノベイティブ プロパティズ カンパニー 水封止性装飾用接着フィルム

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AU1123697A (en) 1997-06-19
WO1997020008A1 (fr) 1997-06-05
JPH09157606A (ja) 1997-06-17
BR9611787A (pt) 1999-07-13
KR19990071810A (ko) 1999-09-27

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