WO2009099263A1 - A method for preparing adsorptive and adhesive foam layer having different composition and a method for producing a adsorptive and adhesive article by using the same - Google Patents

A method for preparing adsorptive and adhesive foam layer having different composition and a method for producing a adsorptive and adhesive article by using the same Download PDF

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Publication number
WO2009099263A1
WO2009099263A1 PCT/KR2008/001629 KR2008001629W WO2009099263A1 WO 2009099263 A1 WO2009099263 A1 WO 2009099263A1 KR 2008001629 W KR2008001629 W KR 2008001629W WO 2009099263 A1 WO2009099263 A1 WO 2009099263A1
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Prior art keywords
adsorptive
adhesive
preparing
foam
foam composition
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PCT/KR2008/001629
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French (fr)
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Bum-Koo Kim
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Bum-Koo Kim
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Publication of WO2009099263A1 publication Critical patent/WO2009099263A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/08—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers using foamed adhesives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
    • C08J5/08—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2170/00—Compositions for adhesives
    • C08G2170/40—Compositions for pressure-sensitive adhesives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2207/00—Foams characterised by their intended use
    • C08J2207/02—Adhesive
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides

Definitions

  • the present invention relates to a method for preparing adsorptive and adhesive foam layer having a different compositions and a method for producing an adsorptive and adhesive article by using the same. More particularly, the present invention relates to a method for producing an adsorptive and adhesive article showing more excellent adsorptive and adhesive properties and removable property by the application of light pressure than the known PSA, whereby, in the production of foam cells, the cell walls and outer media are designed to have a different composition from each other.
  • the cells formed inside the coating layer have excellent elasticity, but the cell walls are not as tacky as the media, so that the cells are not easily deformed under pressure but are easily restored even after deformation. Owing to such characteristics, the open cells are provided with sufficient elasticity to maximize adsorption strength, and the coating media is also provided with sufficient adhesive strength.
  • Adsorptive pressure-sensitive adhesive is designed to have both adsorptive and adhesive properties, in which the adsorptive property is provided by closed- and open-foam cells, and the adhesive property by media, and thus forms a bond with various adherends by the application of light pressure. It is also designed to be repeatedly stuck and unstuck to an adherend, and ideally can be removed without leaving residue on the adherend, but maintains its adhesive property and adhesive force.
  • Such adsorptive pressure-sensitive adhesive consists of a coating layer 1 and a substrate 2, and the coating layer consists of open foam cells 4, closed foam cells 5, cell wall 6, and coating media 3 (FIG. 1) .
  • the adsorptive pressure-sensitive adhesive is adsorbed and adhered onto the adherend 7 by the following physical mechanism.
  • the adhesive coating media 3 is contacted with the adherend to provide an initial adhesive force 9.
  • a pressure applied to the open cells 4 is increased, which increases the activity of the open cells as an adsorption cell 8.
  • the closed foam cells 5 evenly disperse the initial pressure applied to the adherend, so as to form an elastic bulky layer which is required for effective function of the adsorptive and adhesive area.
  • a smooth coating surface is formed on the adherend of fabric or paper having a rough or coarse textured surface (FIG. 1) , and a greater contact area can be also provided on the rough adherend surface even by the application of light pressure (FIG. 2) . That is, adsorption and adhesive strength are established on various adherends .
  • the conventional adhesive is limited to the type of adherend or substrate, whereas the present adsorptive pressure-sensitive adhesive can provide sufficient contact area on the rough adherend surfaces owing to bulkiness of the closed foam cells.
  • the foams are simply designed by using soft polymers or tacky polymers in order to create adhesion with various adherends, the structure of the cells becomes weak or an interior surface of the cells becomes tacky together with a media ingredient, so that the adherends are easily contaminated, or the open foam cell 4 and the closed foam cell 5 are deformed due to the applied pressure upon initial contact and are not restored due to adhesive property of cell walls.
  • the foams' re-adhesion property is significantly reduced due to loss of desired bulkiness (FIG. 3) .
  • General adsorptive coating formulation is prepared by using polymers having a higher strength, thereby ensuring the structural stability and desired bulkiness of foam cells.
  • the adsorptive coating formulation is inferior to the adsorptive and adhesive coating formulation in that it has much lower adhesive strength (Table 1) and hardly exerts its intended effect on the adherends having low surface smoothness or at low temperature due to reduced ductility of adsorption cells.
  • the known adsorptive coating formulation having a foam size of 100 ⁇ m or less hardly maintains cell openness, since small surface cells are covered with polymer coating.
  • the present inventors have developed a foam coating layer having a different composition, in which cell walls 6' are designed to be resilient, but less tacky than the coating media 3', whereas the coating media made of a tacky polymer has reinforced adhesiveness, as shown in FIG. 4.
  • the cell walls and outer media are designed to have a different composition from each other .
  • the coating media is provided with maximized ductility and reinforced adhesiveness, whereas the cell walls formed inside the coating layer are less tacky than the coating media to be easily restored after deformation.
  • the coating layer is characterized by providing bulkiness, stable foam cells, and tacky media, which are required for adsorptive and adhesive articles. Owing to such characteristics, the adsorptive and adhesive articles produced by the coating method repeatedly are stuck and unstuck, and can be also adhered to an adherend without applying a pressure depending on the type of adherend, leading to the present invention.
  • the present invention provides a method for preparing a foam composition, comprising the steps of (1) mixing a foaming aqueous polymer, a foaming agent, a thickening agent, a crosslinking agent, and an extender or a flame retardant with each other to prepare a mixed solution; (2) preparing a primary foam composition using the mixed solution; and (3) adding an adhesive or tackifier, a thickening agent, and a foam size controlling agent to the primary foam composition to prepare a secondary foam composition.
  • the present invention provides a method for producing an adsorptive and adhesive article, comprising the step of coating an adherend with the foam composition prepared by the above method using a knife coater, a bar coater, or a comma coater according to its uses, performing a dry-curing process, and then attaching a release paper thereto.
  • the present invention provides an adsorptive and adhesive article produced by the method, which is excellent in terms of adsorption and adhesive strength, a releasing property and a re-adhesive property.
  • the adsorptive and adhesive article that is produced by using the foam layer having a different composition of the present invention has excellent adsorption and adhesive strength, a releasing property, and a re-adhesive property, and thus can be removed without leaving residue on the adherend.
  • the adsorptive pressure-sensitive adhesive can be applied to various types of adherends, including smooth plastic sheets and rough textiles and non-woven fabrics, by one cycle of coating operation.
  • the products treated with the adsorptive pressure-sensitive adhesive can provide sufficient contact area on rough nonporous adherends as well as smooth adherends, thereby exhibiting better adhesive and removable performances on various types of adherends, compared to the known PSA.
  • the adsorptive pressure-sensitive adhesive also has an adsorptive property, thereby reducing an unpleasant stickiness on the fingers.
  • FIG. 1 is a cross-sectional view showing the structure of adsorptive and adhesive coating layer
  • FIG. 2 is a cross-sectional view showing a physical mechanism for effectively adhering the adsorptive pressure-sensitive adhesive onto the nonporous adherend;
  • FIG. 3 is a cross-sectional view showing the adhesive made of soft or tacky polymer that is deformed by the application of pressure
  • FIG. 4 is a cross-sectional view showing the adsorptive and adhesive article of the present invention, comprising cell walls having reinforced elasticity and coating media having improved adhesiveness; and
  • FIG. 5 is a microscope image showing the adhesive side of the adsorptive and adhesive article, which is applied to a fabric (base fabric: 15Od X 15Od) according to one embodiment of the present invention.
  • the preferred method for preparing a foam composition of the present invention comprises the following steps: (1) mixing 100 parts by weight of a foaming aqueous polymer, 0.01 ⁇ 20 parts by weight of a foaming agent, 0.01-4 parts by weight of a thickening agent, 0.01-7 parts by weight of a crosslinking agent, and 0.01-50 parts by weight of an extender or a flame retardant with each other to prepare a mixed solution; (2) preparing a primary foam composition to a foam density of 0.2-0.5 kg/L using the mixed solution; and
  • the known adsorptive composition having a foam size of 100 jM or less hardly maintains cell openness, since small surface cells are covered with polymer coating.
  • the foam size controlling agent is added to the foam composition of the present invention, so that the cell size is increased by 200-250 ⁇ m to maintain sufficient cell openness (FIG. 5) . Therefore, the foam composition of the present invention has a foam size of approximately 50-250 ⁇ m.
  • the foaming aqueous polymer may be aqueous polymers that are foamed by a mechanical or chemical foaming process, such as acrylics, poly vinyl acetate, ethylene vinyl acetate, polyurethane, and acrylic urethane, but is not limited thereto.
  • the polymer may be used alone or in a mixture of two or more kinds thereof.
  • the polymer may be used in a form of emulsions or dispersions.
  • the foaming agent may be selected from C-14 ⁇ C-24 fatty acid salts, such as lauryl sulfates and stearates, and sulfosuccinates, but is not limited thereto.
  • the foaming agent may be used alone or in a mixture of two or more kinds thereof.
  • the thickening agent may be selected from the group consisting of acrylics, starches and urethanes, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • the crosslinking agent may be selected from the group consisting of melamine formaldehyde, isocyanates, aziridines, and carbodiimides, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • the extender may be titaniumdioxide (Ti ⁇ 2 ) , talc, silica, clay, or calcium carbonate, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • the flame retardant may be organic/inorganic, halogen-based, inorganic (aluminum hydroxide, magnesium hydroxide, antimony oxide) , or melamine-based flame retardants, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • 0.01 ⁇ l parts by weight of a dye may be further added to the mixed solution of step 1.
  • the dye may be organic or inorganic dye, but is not limited thereto.
  • 0.01 ⁇ l parts by weight of a preservative may be further added to the mixed solution of step 1.
  • the preservative may be isothiazolin-based compounds, but is not limited thereto.
  • 0.01 ⁇ l parts by weight of a fungicide may be further added to the mixed solution of step 1.
  • the fungicide may be isothiazolin-based compounds, but is not limited thereto.
  • the foams may be produced using amechanical foam generator .
  • the mechanical foam generators known in the art may be used, and specific examples thereof include those manufactured by Datacolor, Bombi, or Hansa.
  • the adhesive or tackifier added in step 3 may be selected from the group consisting of acrylics, acrylic urethane copolymers, and rosin esters, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • the foam size controlling agent may be selected from the group consisting of polyethyleneoxide, polypropyleneoxide, and polydimethylsiloxane, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
  • the substrate which is coated with the foam composition to produce an adsorptive and adhesive article may be textiles, non-woven fabrics, plastic foams, plastic sheets, papers, or synthetic papers, but is not limited thereto.
  • the method for coating the substrate with the foam composition may be performed using a knife coater, a bar coater, or a comma coater according to its uses, but is not limited thereto.
  • the coated foam composition may be dry-cured at 100 ⁇ 150 ° Cfor 1-3 min.
  • Example 1 Preparation of foam composition of the present invention
  • the mixed solution was foamed using a foam generator (Autofoam/Datacolor) to a foam density of 0.27 ⁇ 0.3 g/mL.
  • Example 2 Production of adsorptive and adhesive article of the present invention
  • the foam composition prepared in Example 1 was applied to the back side of textile (15Od X 15Od) in the coating line using a coating knife (2 mm width) by gap coating (gap space : 0.4-0.5mm) .
  • the coating was dry-cured at 120-150 ° C for 2 min, and then covered with a release paper, so as to produce the adsorptive and adhesive article of the present invention.
  • FIG. 5 shows a microscope image (Model: Olympus DP12) of the adhesive side of the adsorptive and adhesive article that was produced by coating a textile with the foam composition as the above. As shown in FIG. 5, it was found that different-sized cells on the surface of coating layer retain their open shape without deformation, and smooth adhesive surface and bulkiness are maintained, irrespective of the surface roughness of fabric (base fabric: 150 x 150 denier plain weave) .
  • the adsorptive and adhesive article produced in Example 2 was tested for its adsorption and adhesive strength.
  • the test was performed in accordance with KSA 1107.
  • Stainless steel, glass, and acrylic were used as an adherend, and their adsorption and adhesive strength was measured under the conditions of the following Table 1, by comparison with the known products.
  • the adsorptive and adhesive sheet of the present invention exhibited significantly improved adhesion and holding power, compared to the known adsorptive sheets.
  • the adsorptive pressure-sensitive adhesive having a different foam composition of the present invention and the adsorptive and adhesive article produced using the same can be ideally removed without leaving residue on various types of adherends, such as copy paper, advertisement paper, photo paper, a double-faced adhesive tape, an interior sheet and article, a decorative sheet and article, a wallpaper and a labeling paper, even after a predetermined time period, so that they can be re-used.
  • adherends such as copy paper, advertisement paper, photo paper, a double-faced adhesive tape, an interior sheet and article, a decorative sheet and article, a wallpaper and a labeling paper, even after a predetermined time period, so that they can be re-used.
  • the adsorptive pressure-sensitive adhesive can be applied to various types of adherends, including rough textiles and non-woven fabrics that are hardly coated by the known paste coating method, by one cycle of coating operation.
  • various adsorptive and adhesive articles can be produced by using the adhesive. In addition, they do not leave an unpleasant

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The present invention relates to a method for preparing an adsorptive and adhesive foam composition having a different composition, capable of providing both adsorptive and adhesive properties, and a method for producing an adsorptive and adhesive article using the foam composition prepared by the method. In the present invention, cell walls and outer media are designed to have a different composition from each other in the production of foam cells, so that the adsorptive and adhesive coating formulation is appliedby a foam coatingmethod. Thus, the coating media is provided with sufficient adhesiveness, whereas the cells formed inside the coating layer have excellent elasticity, but the cell walls are not as tacky as the media, so that the cells are not easily deformed under pressure but are easily restored even after deformation.

Description

[DESCRIPTION] [Invention Title]
A METHOD FOR PREPARING ADSORPTIVE AND ADHESIVE FOAM LAYER HAVING DIFFERENT COMPOSITION AND A METHOD FOR PRODUCING A ADSORPTIVE AND ADHESIVE ARTICLE BY USING THE SAME [Technical Field]
The present invention relates to a method for preparing adsorptive and adhesive foam layer having a different compositions and a method for producing an adsorptive and adhesive article by using the same. More particularly, the present invention relates to a method for producing an adsorptive and adhesive article showing more excellent adsorptive and adhesive properties and removable property by the application of light pressure than the known PSA, whereby, in the production of foam cells, the cell walls and outer media are designed to have a different composition from each other. Thus, the cells formed inside the coating layer have excellent elasticity, but the cell walls are not as tacky as the media, so that the cells are not easily deformed under pressure but are easily restored even after deformation. Owing to such characteristics, the open cells are provided with sufficient elasticity to maximize adsorption strength, and the coating media is also provided with sufficient adhesive strength.
[Background Art] Adsorptive pressure-sensitive adhesive (APSA) is designed to have both adsorptive and adhesive properties, in which the adsorptive property is provided by closed- and open-foam cells, and the adhesive property by media, and thus forms a bond with various adherends by the application of light pressure. It is also designed to be repeatedly stuck and unstuck to an adherend, and ideally can be removed without leaving residue on the adherend, but maintains its adhesive property and adhesive force.
Such adsorptive pressure-sensitive adhesive consists of a coating layer 1 and a substrate 2, and the coating layer consists of open foam cells 4, closed foam cells 5, cell wall 6, and coating media 3 (FIG. 1) .
The adsorptive pressure-sensitive adhesive is adsorbed and adhered onto the adherend 7 by the following physical mechanism.
First, when the coating layer is contacted with the adherend 7, the adhesive coating media 3 is contacted with the adherend to provide an initial adhesive force 9. At this time, as a tacky adhesive area surrounding the open cells increases, a pressure applied to the open cells 4 is increased, which increases the activity of the open cells as an adsorption cell 8. Such effects of improving the adsorption and adhesive strength are more enhanced by the closed cell 5. The closed foam cells 5 evenly disperse the initial pressure applied to the adherend, so as to form an elastic bulky layer which is required for effective function of the adsorptive and adhesive area. Thus, a smooth coating surface is formed on the adherend of fabric or paper having a rough or coarse textured surface (FIG. 1) , and a greater contact area can be also provided on the rough adherend surface even by the application of light pressure (FIG. 2) . That is, adsorption and adhesive strength are established on various adherends .
Since the adhesive force is proportional to adhesive property and contact area, the conventional adhesive is limited to the type of adherend or substrate, whereas the present adsorptive pressure-sensitive adhesive can provide sufficient contact area on the rough adherend surfaces owing to bulkiness of the closed foam cells.
Meanwhile, if the foams are simply designed by using soft polymers or tacky polymers in order to create adhesion with various adherends, the structure of the cells becomes weak or an interior surface of the cells becomes tacky together with a media ingredient, so that the adherends are easily contaminated, or the open foam cell 4 and the closed foam cell 5 are deformed due to the applied pressure upon initial contact and are not restored due to adhesive property of cell walls. Thus, the foams' re-adhesion property is significantly reduced due to loss of desired bulkiness (FIG. 3) .
General adsorptive coating formulation is prepared by using polymers having a higher strength, thereby ensuring the structural stability and desired bulkiness of foam cells. However, the adsorptive coating formulation is inferior to the adsorptive and adhesive coating formulation in that it has much lower adhesive strength (Table 1) and hardly exerts its intended effect on the adherends having low surface smoothness or at low temperature due to reduced ductility of adsorption cells. In addition, the known adsorptive coating formulation having a foam size of 100 μm or less hardly maintains cell openness, since small surface cells are covered with polymer coating.
Accordingly, in order to overcome such drawbacks, the present inventors have developed a foam coating layer having a different composition, in which cell walls 6' are designed to be resilient, but less tacky than the coating media 3', whereas the coating media made of a tacky polymer has reinforced adhesiveness, as shown in FIG. 4.
In the production of foam cells, the cell walls and outer media are designed to have a different composition from each other . Thus, the coating media is provided with maximized ductility and reinforced adhesiveness, whereas the cell walls formed inside the coating layer are less tacky than the coating media to be easily restored after deformation. Accordingly, the coating layer is characterized by providing bulkiness, stable foam cells, and tacky media, which are required for adsorptive and adhesive articles. Owing to such characteristics, the adsorptive and adhesive articles produced by the coating method repeatedly are stuck and unstuck, and can be also adhered to an adherend without applying a pressure depending on the type of adherend, leading to the present invention.
[Disclosure] [Technical Problem] It is an object of the present invention to provide an adsorptive and adhesive foam layer for the production of adsorptive and adhesive articles, which are provided with bulkiness and sufficient adhesiveness and have foam cells having sufficient ductility and elasticity and open cells having a size suitable for adsorption to have excellent adsorption and adhesive strength, a releasing property and a re-adhesive property to various types of adherends.
It is another object of the present invention to provide an adsorptive and adhesive article produced by using the adsorptive and adhesive foam layer, and a method for producing the same.
[Technical Solution]
In order to achieve the above object, the present invention provides a method for preparing a foam composition, comprising the steps of (1) mixing a foaming aqueous polymer, a foaming agent, a thickening agent, a crosslinking agent, and an extender or a flame retardant with each other to prepare a mixed solution; (2) preparing a primary foam composition using the mixed solution; and (3) adding an adhesive or tackifier, a thickening agent, and a foam size controlling agent to the primary foam composition to prepare a secondary foam composition.
Further, the present invention provides a method for producing an adsorptive and adhesive article, comprising the step of coating an adherend with the foam composition prepared by the above method using a knife coater, a bar coater, or a comma coater according to its uses, performing a dry-curing process, and then attaching a release paper thereto.
Furthermore, the present invention provides an adsorptive and adhesive article produced by the method, which is excellent in terms of adsorption and adhesive strength, a releasing property and a re-adhesive property.
[Advantageous Effects]
The adsorptive and adhesive article that is produced by using the foam layer having a different composition of the present invention has excellent adsorption and adhesive strength, a releasing property, and a re-adhesive property, and thus can be removed without leaving residue on the adherend. Further, owing to bulkiness of the coating layer, the adsorptive pressure-sensitive adhesive can be applied to various types of adherends, including smooth plastic sheets and rough textiles and non-woven fabrics, by one cycle of coating operation. In addition, owing to such characteristics, the products treated with the adsorptive pressure-sensitive adhesive can provide sufficient contact area on rough nonporous adherends as well as smooth adherends, thereby exhibiting better adhesive and removable performances on various types of adherends, compared to the known PSA. The adsorptive pressure-sensitive adhesive also has an adsorptive property, thereby reducing an unpleasant stickiness on the fingers.
[Description of Drawings]
FIG. 1 is a cross-sectional view showing the structure of adsorptive and adhesive coating layer; FIG. 2 is a cross-sectional view showing a physical mechanism for effectively adhering the adsorptive pressure-sensitive adhesive onto the nonporous adherend;
FIG. 3 is a cross-sectional view showing the adhesive made of soft or tacky polymer that is deformed by the application of pressure;
FIG. 4 is a cross-sectional view showing the adsorptive and adhesive article of the present invention, comprising cell walls having reinforced elasticity and coating media having improved adhesiveness; and FIG. 5 is a microscope image showing the adhesive side of the adsorptive and adhesive article, which is applied to a fabric (base fabric: 15Od X 15Od) according to one embodiment of the present invention.
[Best Mode] Hereinafter, the present invention will be described in detail.
The preferred method for preparing a foam composition of the present invention comprises the following steps: (1) mixing 100 parts by weight of a foaming aqueous polymer, 0.01~20 parts by weight of a foaming agent, 0.01-4 parts by weight of a thickening agent, 0.01-7 parts by weight of a crosslinking agent, and 0.01-50 parts by weight of an extender or a flame retardant with each other to prepare a mixed solution; (2) preparing a primary foam composition to a foam density of 0.2-0.5 kg/L using the mixed solution; and
(3) adding 0.01-50 parts byweight of an adhesive ortackifier, 0.01-5 parts by weight of a thickening agent, and 0.01-5 parts by weight of a foam size controlling agent to 100 parts by weight of the primary foam composition, and stirring the mixture to be a foam density of 0.2-0.5 kg/L, so as to prepare a secondary foam composition.
There is a problem in that the known adsorptive composition having a foam size of 100 jM or less hardly maintains cell openness, since small surface cells are covered with polymer coating. In order to solve the problem, the foam size controlling agent is added to the foam composition of the present invention, so that the cell size is increased by 200-250 μm to maintain sufficient cell openness (FIG. 5) . Therefore, the foam composition of the present invention has a foam size of approximately 50-250 μm.
In the present invention, the foaming aqueous polymer may be aqueous polymers that are foamed by a mechanical or chemical foaming process, such as acrylics, poly vinyl acetate, ethylene vinyl acetate, polyurethane, and acrylic urethane, but is not limited thereto.
In the present invention, the polymer may be used alone or in a mixture of two or more kinds thereof.
In the present invention, the polymer may be used in a form of emulsions or dispersions.
In the present invention, the foaming agent may be selected from C-14 ~ C-24 fatty acid salts, such as lauryl sulfates and stearates, and sulfosuccinates, but is not limited thereto. The foaming agent may be used alone or in a mixture of two or more kinds thereof.
In the present invention, the thickening agent may be selected from the group consisting of acrylics, starches and urethanes, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto. In the present invention, the crosslinking agent may be selected from the group consisting of melamine formaldehyde, isocyanates, aziridines, and carbodiimides, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto. In the present invention, the extendermay be titaniumdioxide (Tiθ2) , talc, silica, clay, or calcium carbonate, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
In the present invention, the flame retardant may be organic/inorganic, halogen-based, inorganic (aluminum hydroxide, magnesium hydroxide, antimony oxide) , or melamine-based flame retardants, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
In the preferred embodiment of the present invention, 0.01~l parts by weight of a dye may be further added to the mixed solution of step 1.
In the present invention, the dye may be organic or inorganic dye, but is not limited thereto.
In the preferred embodiment of the present invention, 0.01~l parts by weight of a preservative may be further added to the mixed solution of step 1.
In the present invention, the preservative may be isothiazolin-based compounds, but is not limited thereto.
In the preferred embodiment of the present invention, 0.01~l parts by weight of a fungicide may be further added to the mixed solution of step 1.
In the present invention, the fungicide may be isothiazolin-based compounds, but is not limited thereto.
In the present invention, the foams may be produced using amechanical foam generator . The mechanical foam generators known in the art may be used, and specific examples thereof include those manufactured by Datacolor, Bombi, or Hansa.
In the present invention, the adhesive or tackifier added in step 3 may be selected from the group consisting of acrylics, acrylic urethane copolymers, and rosin esters, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
In the present invention, the foam size controlling agent may be selected from the group consisting of polyethyleneoxide, polypropyleneoxide, and polydimethylsiloxane, and they may be used alone or in a mixture of two or more kinds thereof, but is not limited thereto.
In the present invention, the substrate which is coated with the foam composition to produce an adsorptive and adhesive article may be textiles, non-woven fabrics, plastic foams, plastic sheets, papers, or synthetic papers, but is not limited thereto.
In the present invention, the method for coating the substrate with the foam composition may be performed using a knife coater, a bar coater, or a comma coater according to its uses, but is not limited thereto.
In the present invention, the coated foam composition may be dry-cured at 100~150°Cfor 1-3 min.
[Mode for Invention] Hereinafter, the constitution and effects of the present invention will be described in more detail with reference to Examples. However, these Examples are for illustrative purposes only, and the invention is not intended to be limited by these Examples .
Example 1 : Preparation of foam composition of the present invention
While stirring 50 kg of acrylic emulsion (50% solids), 1.5 kg of TiO2 ( 60% solution) and 0.25 kg of thickening agent (acrylic: alkali swellable thickener) were added thereto, and 2 kg of sodium sulfosuccinate (30%) and 2 kg of ammonium stearate solution (28%) were added thereto. The mixture was stirred at 800 RPM for 5 mins .
1 kg of carbodiimide (40%) as a crosslinking agent and 0.005 kg of isothiazolin-based fungicide were added to the stirred solution, and the mixture was stirred to a viscosity of 3, 000~4, 000 cps (Brookfield viscometer, 20 rpm, #4 spindle) for about 10 mins to prepare a mixed solution.
The mixed solution was foamed using a foam generator (Autofoam/Datacolor) to a foam density of 0.27 ~ 0.3 g/mL.
While mildly stirring the foamed solution in a mixer at 300
RPM, 0.5 kg of acrysol ASE-60, 5 kg of acrylic urethane adhesive
(YST 630, 56%) , and 1 kg of polyethylene oxide were added thereto, and mixed well. Then, the mixture was stirred to a final density of 0.3 ~ 0.35 g/mL, so as to prepare the foam composition of the present invention.
Example 2 : Production of adsorptive and adhesive article of the present invention The foam composition prepared in Example 1 was applied to the back side of textile (15Od X 15Od) in the coating line using a coating knife (2 mm width) by gap coating (gap space : 0.4-0.5mm) . The coating was dry-cured at 120-150 °C for 2 min, and then covered with a release paper, so as to produce the adsorptive and adhesive article of the present invention.
FIG. 5 shows a microscope image (Model: Olympus DP12) of the adhesive side of the adsorptive and adhesive article that was produced by coating a textile with the foam composition as the above. As shown in FIG. 5, it was found that different-sized cells on the surface of coating layer retain their open shape without deformation, and smooth adhesive surface and bulkiness are maintained, irrespective of the surface roughness of fabric (base fabric: 150 x 150 denier plain weave) .
Experimental Example 1 : Test of adsorption and adhesive strength
The adsorptive and adhesive article produced in Example 2 was tested for its adsorption and adhesive strength. The test was performed in accordance with KSA 1107. Stainless steel, glass, and acrylic were used as an adherend, and their adsorption and adhesive strength was measured under the conditions of the following Table 1, by comparison with the known products.
[Table i;
Figure imgf000015_0001
As shown in the test results of Table 1, the adsorptive and adhesive sheet of the present invention exhibited significantly improved adhesion and holding power, compared to the known adsorptive sheets.
It is to be understood that the above description is intended to be illustrative and not restrictive. Many embodiments will be apparent to those of skill in the art upon reading the above description. Therefore, the scope of the invention should be determined with references to the appended claims and includes the full scope of equivalents to which such claims are entitled.
[Industrial Applicability] As described above, the adsorptive pressure-sensitive adhesive having a different foam composition of the present invention and the adsorptive and adhesive article produced using the same can be ideally removed without leaving residue on various types of adherends, such as copy paper, advertisement paper, photo paper, a double-faced adhesive tape, an interior sheet and article, a decorative sheet and article, a wallpaper and a labeling paper, even after a predetermined time period, so that they can be re-used. In particular, the adsorptive pressure-sensitive adhesive can be applied to various types of adherends, including rough textiles and non-woven fabrics that are hardly coated by the known paste coating method, by one cycle of coating operation. Thus, various adsorptive and adhesive articles can be produced by using the adhesive. In addition, they do not leave an unpleasant stickiness on the fingers, thereby being used in DIY products.

Claims

[CLAIMS]
[Claim 1]
A method for preparing an adsorptive and adhesive foam composition, comprising the steps of: (1) mixing 100 parts by weight of a foaming aqueous polymer, 0.01-20 parts by weight of a foaming agent, 0.01-4 parts by weight of a thickening agent, 0.01-7 parts by weight of a crosslinking agent, and 0.01-50 parts by weight of an extender or a flame retardant with each other to prepare a mixed solution; (2) preparing a primary foam composition to a foam density of 0.
2-0.5 kg/L using the mixed solution;
(3) adding 0.01-50 partsby weight of an adhesive ortackifier and 0.01-5 parts by weight of a thickening agent to 100 parts by weight of the primary foam composition, so that cell walls and outer media have a different composition from each other; and
(4 ) adding 0.01-5 parts by weight of a foam size controlling agent thereto and stirring the mixture to a foam density of 0.2-0.5 kg/L. [Claim 2]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the foaming aqueous polymer is selected from the group consisting of acrylics, poly vinyl acetate, ethylene vinyl acetate, polyurethane, acrylic urethane, and combinations thereof. [ Claim 3 ]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the foaming agent is selected from the group consisting of lauryl sulfate, lauryl ether sulfates, oleates, stearates, sulfosuccinates, and combinations thereof.
[Claim 4]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the thickening agent is selected from the group consisting of acrylics, starches, urethanes, and inorganic agents, and combinations thereof.
[Claim 5]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the crosslinking agent is selected from the group consisting of melamine formaldehyde, isocyanates, aziridines, carbodiimides, and combinations thereof.
[Claim 6]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the extender is selected from the group consisting of titanium dioxide (TiO2), talc, silica, clay, calcium carbonate, and combinations thereof.
[Claim 7]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the flame retardant is selected from the group consisting of aluminum hydroxide, magnesium hydroxide, antimony oxide, and combinations thereof.
[Claim 8]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein 0.01~l parts by weight of a dye is further added to the mixed solution of step 1.
[Claim 9]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein 0.01~l parts by weight of a preservative is further added to the mixed solution of step 1.
[Claim 10]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein 0.01-1 parts by weight of a fungicide is further added to the mixed solution of step 1.
[Claim 11]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the adhesive or tackifier added in step 3 is selected from the group consisting of acrylics, acrylic urethane copolymers, and rosin esters, and combinations thereof .
[Claim 12]
The method for preparing an adsorptive and adhesive foam composition according to claim 1, wherein the foam size controlling agent is selected from the group consisting of polyethyleneoxide, polypropyleneoxide, polydimethylsiloxane, and combinations thereof.
[Claim 13] A method for producing an adsorptive and adhesive article, comprising the step of coating anadherend with the foam composition prepared by the method of any one of claims 1 to 12, performing a dry-curing process, and then attaching a release paper thereto.
[Claim 14] The method for producing an adsorptive and adhesive article according to claim 13, wherein the adherend is a textile, a non-woven fabric, a copy paper, a paper, a synthetic paper, a wallpaper, a decorative sheet, an interior sheet, a plastic foam, or a plastic sheet.
[Claim 15]
The method for producing an adsorptive and adhesive article according to claim 13, wherein the method for coating the adherend with the foam composition is performed using a knife coater, a bar coater, or a comma coater.
[Claim 16]
An adsorptive and adhesive article produced by the method of claim 13, having excellent adsorption and adhesive strength, a releasing property and a re-adhesive property.
[Claim 17] An adsorptive and adhesive composition prepared by the method of any one of claims 1 to 12, having a different composition in cell walls and outer media. [Claim 18]
The adsorptive and adhesive composition according to claim 17, wherein a foam size is 50~250 μm.
PCT/KR2008/001629 2008-02-05 2008-03-21 A method for preparing adsorptive and adhesive foam layer having different composition and a method for producing a adsorptive and adhesive article by using the same WO2009099263A1 (en)

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CN103849266A (en) * 2012-11-26 2014-06-11 设计壁纸有限公司 Eco-friendly wallpaper composition using gelatinized starch and acrylic ester
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