KR101959667B1 - Method Of Producing Inkjet Printing Media Having Foam Adhesion Layer - Google Patents

Abstract

The present invention relates to a recording medium for inkjet printing which absorbs ink of an inkjet printer and forms an image on the surface thereof. According to the present invention, provided is a recording medium for inkjet printing having a foam adhesive layer which solves problems such as a side edge peeling which is a disadvantage occurred in existing adhesive products, a defective bubble generation on an adherend surface during an adhering process, a transferring of adhesive ingredients to an adhered product, a difficulty of removing due to the increase in adhesion when being attached for a long period of time; and can be formed into a foam adhesive product on various materials as a re-positionable product. The recording medium having a foam adhesive layer can be used for an outdoor advertisement and an interior product as the transfer of an adhesive does not occur, the weather resistance is excellent, and the detachment does not to occur for a long period of time, and thus can be easily used for various uses and purposes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing a recording medium for ink jet printing having a foamed foam adhesive layer,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium for ink jet printing which absorbs ink of an ink jet printer to form an image on its surface, and more particularly to a product having a foamed foam adhesive layer on the back surface of an image layer.

Conventional adhesive materials merely require functions that are easy to adhere, while recent adhesive materials require various functions and performances such as adhesiveness, durability and vibration absorption suitable for environment based on ease of attachment and detachment. Especially, In the case of products, interior wallpaper, decorative products, etc., it is required to have durability against high temperature and high humidity and climate change and to maintain the adhesive performance for a long time. However, existing adhesives / adhesive tapes and advertising products have disadvantages in that the substrate properties change due to the external environment and adversely affect the adhesive strength of the adhesive, so that the shear stress of the adhesive layer or the adhesive layer is weakened.

Korean Patent Publication No. 10-2016-0035704 (published on April 01, 2016)

Therefore, the present invention solves the problems such as defective occurrence of bubbles on the adherend surface during sticking of the edges, disadvantages occurring in the existing adhesive products, and difficulty in removing the adhesive due to transfer of the adhesive component onto the adherend, And provides a recording medium for ink jet printing having a foam-type pressure-sensitive adhesive layer capable of forming a foam-adhering product in various materials as a Re-positionable product and having excellent weather resistance without causing transfer of a pressure-sensitive adhesive, To be a technical challenge.

Therefore, according to the present invention, there is provided a process for producing a toner comprising the steps of mixing and stirring 50 to 100 parts by weight of a liquid resin, 0.1 to 10 parts by weight of a stabilizer, 0.1 to 5 parts by weight of a thickener, 0.1 to 5 parts by weight of a crosslinking agent and 0.1 to 10 parts by weight of an aqueous white toner, 5 parts by weight of a viscosity of 1,000 to 50,000 cps to prepare a mixed solution;

Foaming the mixture to a foaming ratio of 2 to 10 times to form a foam composition;

Coating and drying the foam composition on a substrate to a thickness of 10 to 200 탆; And

And a step of laminating a releasing paper on a coated surface on which the foam composition is coated. The method of manufacturing a recording medium for ink jet printing having a foamed foam adhesive layer is provided.

Hereinafter, the present invention will be described in detail.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium for ink jet printing which absorbs ink of an ink jet printer to form an image on its surface, and more particularly to a product having a foamed foam adhesive layer on the back surface of an image layer.

The method for producing a recording medium for ink jet printing having a foamed foam adhesive layer of the present invention comprises a mixture liquid production step, a foam composition forming step, a coating step and a lapping step.

The mixing liquid is prepared by mixing and stirring 50 to 100 parts by weight of a liquid resin, 0.1 to 10 parts by weight of a foam stabilizer, 0.1 to 5 parts by weight of a thickener, 0.1 to 5 parts by weight of a crosslinking agent and 0.1 to 10 parts by weight of a white toner.

The liquid resin may be an acrylic resin, a polyurethane resin, a PVC resin, or a rubber resin. Particularly when acrylic resin is used, acrylic resin emulsion adhesives having a glass transition temperature (Tg) of -70 to + Or a mixture of two or more kinds of products is preferably used in view of controlling the physical properties of the pressure-sensitive adhesive. When a pressure-sensitive adhesive having a glass transition temperature (Tg) of less than -70 ° C is used, the pressure-sensitive adhesive may be transferred to the adherend due to its softness and weak cohesive force. When the glass transition temperature (Tg) Not only does it not stick well to the adherend, but it also easily drops off from the adherend.

It is preferable that the liquid resin is contained in an amount of 50 to 100 parts by weight from the viewpoints of the application amount control and the adhesive property.

The foam stabilizer improves the miscibility by lowering the surface tension, uniformizes the size of the produced bubbles, and stabilizes the foam by controlling the cell structure of the foam, thereby maintaining uniform micro bubbles for a long time It is preferable to use a silicone foam stabilizer containing a silicone surfactant as a main component. If less than 0.1 parts by weight of the foam stabilizer is used, microbubbles may not be formed and maintained. If the amount is more than 10 parts by weight, the physical properties of the pressure-sensitive adhesive may deteriorate due to the foam stabilizer.

As the thickener, an aqueous thickener is used, and a commonly used aqueous thickener may be used. Particularly, it is more preferable to use a polyacrylate copolymer thickener in terms of an excellent thickening effect and a viscosity stability.

The cross-linking agent may be a conventional aqueous cross-linking agent. In particular, it is preferable to use one selected from the group consisting of isocyanates, aziridines, epoxies, metal oxides and the like in terms of adhesive holding force and adhesive strength.

The white toner brings about an effect of improving whiteness and hiding power, and it is possible to use an aqueous white toner which is conventionally used. Particularly, an inorganic pigment such as titanium dioxide (TiO2), silica, calcium carbonate, etc., Is preferably used, and it is further preferable to use those dispersed in a solvent.

Then, a foaming composition is formed by foaming the mixture at a foaming ratio of 2 to 10 by using a mixed solution having the above composition to form a foam composition. The foam composition forming step may use a foaming machine capable of physically forming a foam and capable of facilitating foam (foaming), and a commercially available physical foaming machine may be used. The density of the foam during foaming can be controlled by adjusting the ratio of the volume of the foam to the weight of the foam during stirring, and the size and shape of the pores can be varied according to the pressure of the air injected into the foaming machine and the expansion ratio, The foam size decreases and becomes constant as the expansion ratio is increased.

The substrate to be coated may be a textile, a nonwoven fabric, a paper, a synthetic paper, a wallpaper, a PVC sheet, a PET sheet, a TPU sheet A plastic sheet, and a foam sheet may be used.

On one surface of the substrate, an ink absorbing layer is formed on one surface of the substrate before coating the foam composition to a thickness of 10 to 200 탆 as described above. The ink absorbing layer of the output material for the solvent ink and the latex ink may be used alone or in combination with the PVC, PU and acrylic resin. The additives may include plasticizers, oils, surfactants , Silica (silicon dioxide), titanium dioxide (TiO2), a thickener, a UV absorber, and the like. The ink absorbing layer of the output material for the pigment ink may be a mixture of acrylic resin, polyurethane resin, silica, oil, surfactant, and curing agent. The ink absorbing layer of the output material for dye ink may be PVA resin, PVP resin, EVA resin, , A dye fixing agent, a fluorescent whitening agent, and a UV absorber. For the thermal sublimation ink, a dye fixing agent, a softening agent, and a surfactant may be mixed and used.

The method of coating the foam composition on the substrate may be performed by any one method selected from the group consisting of a knife, a bar and a comma coater.

After the coating step is completed, the releasing paper is joined to the coated surface on which the foam composition is coated, thereby completing the production of the ink jet printing recording medium having the foamed foam adhesive layer of the present invention.

As another method, a release paper may be put in a first paper sheet to apply a foam adhesive, and then the paper may be laminated with a substrate to produce a recording medium for inkjet printing having the foamed foam adhesive layer of the present invention. In addition, depending on the use of a general adhesive sheet or tape, a substrate having no ink absorbing layer as described above may be used on one side of the substrate.

Therefore, the present invention solves the problem of mangling, sticking defects, transfer of adhesive components with adhesive agent, which is a disadvantage occurring in existing adhesive products, and is capable of re-positionable products, It is possible to provide a recording medium for inkjet printing having a foamed foam adhesive layer which can be used as an outdoor advertisement and an interior product because it can be easily used for various purposes because the pressure-sensitive adhesive is not transferred, is excellent in weatherability and is not dropped for a long time. In addition, the use of an aqueous acrylic pressure-sensitive adhesive has an advantage of being excellent in price competitiveness and being environmentally friendly.

1 is a cross-sectional SEM photograph of a recording medium for ink jet printing having a foamed foam adhesive layer of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of a specific embodiment of a method for producing a recording medium for ink jet printing having a foamed foam adhesive layer of the present invention.

[Example 1]

100 parts by weight of an acrylic emulsion pressure-sensitive adhesive having a glass transition temperature (Tg) of -40 DEG C, 4 parts by weight of a silicone foam stabilizer, 1 part by weight of an acrylic thickener, 2 parts by weight of a crosslinking agent (isocyanate type) and 3 parts by weight of an aqueous white toner Mixed and stirred to prepare a mixed solution having a viscosity of 5,000 cps and foamed using a foaming machine so as to have a foaming magnification of 3 times to form a foam composition. Then, the foam composition was applied to a polyester fabric having a thickness of 100 μm by a comma coater Coater, and then the release paper was laminated on the coated surface coated with the foam composition to prepare a recording medium for inkjet printing having the foamed foam adhesive layer of the present invention.

[Example 2]

50 parts by weight of an acrylic emulsion pressure-sensitive adhesive having a glass transition temperature (Tg) of -40 DEG C, 50 parts by weight of an acrylic emulsion pressure-sensitive adhesive having a glass transition temperature (Tg) of -60 DEG C, 4 parts by weight of silicone pressure- (Isocyanate-based), and 3 parts by weight of an aqueous white toner (titanium dioxide) were mixed and stirred to prepare a mixed liquid having a viscosity of 5,000 cps. The mixture was foamed using a foaming machine so as to have a foaming magnification of 3 times to form a foam composition, The foam composition was coated on a releasing paper having a thickness of 80 μm using a comma coater and then a synthetic paper was coated on the coated surface of the foam composition to form an inkjet printing recording medium having a foamed foam adhesive layer of the present invention .

[Comparative Example 1]

0.5 part by weight of azodicarbonamide as a chemical foaming agent was added to form a foam composition, and then the foam composition was applied to a release paper of 80 μm thickness as a base, using a comma coater ), Followed by laminating a synthetic paper on the coated surface coated with the foam composition.

The adhesive strength of Example 1, Example 2, and Comparative Example 1 were compared and evaluated after adhesive strength after hot and humid, adhesive strength after thermal shock, adhesive residue, and adhesion.

adhesiveness
(g / inch) High temperature and high humidity
(g / inch) Thermal shock
(g / inch) Adhesive residue Example 1 754 713 1,142 none Example 2 807 608 1,924 none Comparative Example 1 252 74 135 has exist

○ Adhesion: Evaluation by KS T 1028 method

    - Adhesion is measured using a tensile tester

    - The specimen is 3mm in length, 250mm

○ High temperature and high humidity test: Evaluation by KS T 1028 method

    - After pressing the specimen at a rate of 5mm / s at the speed of 5mm / s from the top of the specimen, leave it for 72 hours at room temperature, leave it for 72 hours at high temperature and high humidity (50 ℃, 95%

    - The area of the test piece is 25mm x 250mm and 3 pieces

○ Thermal shock test: Evaluation by KS T 1028 method

    - After pressing the specimen at a rate of 5mm / s at the speed of 5mm / s from the top of the specimen, leave it at room temperature for 72 hours, heat shock (-40 ℃ / 2 hours + 85 ℃ / 2 hours: 1 cycle)

    - The area of the test piece is 25mm x 250mm and 3 pieces

○ adhesive residue

    - The specimens were squeezed with a roller at a rate of 5 mm / s for the specified number of times,

      The degree of viscous residue remaining after desorption is measured visually

a: ink absorbing layer b: base layer
c: foamed foam composition layer d: release layer

Claims (5)

Wherein the thermosetting resin composition comprises 50 to 100 parts by weight of a liquid resin which is an acrylic emulsion pressure-sensitive adhesive having a glass transition temperature (Tg) of from -70 to +20 DEG C, 0.1 to 10 parts by weight of a silicone foam stabilizer mainly composed of a silicone surfactant, 0.1 to 5 parts by weight of a thickener, And 0.1 to 10 parts by weight of an aqueous white toner are mixed and stirred to prepare a mixed solution;
Physically foaming the mixture at a foaming magnification of 2 to 10 times using the mixed solution to form a foam composition;
Coating the foam composition on the substrate to a thickness of 10 to 200 mu m; And
Wherein the foaming adhesive layer is formed by laminating a releasing paper on a coated surface coated with the foam composition. delete delete The method according to claim 1,
Characterized in that the substrate is selected from the group consisting of textile, nonwoven, paper, synthetic paper, wallpaper, PVC sheet, PET, TPU, plastic sheet and foam sheet. A method of manufacturing a recording medium for output. The method according to claim 1,
The method for coating the foam composition on a substrate uses any one method selected from the group consisting of a knife, a bar and a comma coater. ≪ / RTI >

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