WO2004058498A1

WO2004058498A1 - Thin film for laminating

Info

Publication number: WO2004058498A1
Application number: PCT/KR2003/002691
Authority: WO
Inventors: Seung-Ha Lim; Sang-Uk Yeo
Original assignee: Royal Sovereign Inc.
Priority date: 2002-12-31
Filing date: 2003-12-09
Publication date: 2004-07-15
Also published as: AU2003303341A1; KR20040062200A; KR100450495B1

Abstract

There is provided a functional thin laminating film for laminating an adhered matter in such a manner that a thin film layer coated on a laminating sheet is transferred to a surface of the adhered matter, the laminating film including : a base film having a releasing property for allowing to be easily separated from the adhered matter after lamination; a functional thin film layer coated with a resin having a function-reinforcement additive on the base film; and an adhesive layer coated with a heat-sealable resin having a urethane-based resin added thereto, on the functional thin film layer, whereby an edge portion of the laminated matter on the adhered matter is easily cut.

Description

THIN FILM FOR LAMINATING

Technical Field

The present invention relates to a thin laminating film, and more particularly, to a thin laminating film in which a thin film layer coated with resin ink on a base film is transferred on a surface of an object such as a card, a document and the like and the base film is separated such that the object is laminated by the thin resin film.

Background Art

Laminating is to coat a transparent thin film such as a synthetic resin film and the like on a surface of a printed matter of a document, an advertisement matter, a card and the like, or on a surface of a digital printed matter of advertisement matter to achieve a protection of the printed matter from an external environment such as weather resistance, durability, light resistance and the like.

In a conventional laminating method, a polyolefin-based thermoplastic synthetic resin film such as polyethylene, polypropylene, poly-vinyl chloride or the like is fused on both surfaces of an object to be laminated for contents protection, and then is cut in a predetermined size at a distance apart from an edge portion of the contents.

However, the synthetic resin film has disadvantages in that due to its thickness, appearance is rough, synthetic resin material is much consumed, close adhesion ability to a surface of the object is lowered so that the film gets loose refraction is generated so that a character, a picture or the like on the surface of the adhered matter cannot be vividly seen, and also after lamination is completed, cutting should be performed one by one at a distance from the edge portion of the object.

Further, like the film for a food wrapping container and the laminating film for advertisement, the synthetic resin film is also processed to a composition such as an aluminum deposition film/a polyethylene resin, polypropylene film/a polyethylene resin, polyester film/a polyethylene resin/an ethyl vinyl acetate resin and the like.

Since these films use raw material having a strong property so as to satisfy requirements of water resistance, pore resistance, durability and the like, they are mostly adhered coating a hot melt adhesive layer on a preformed film in an extrusion method such as a T-die, a dry lamination or the like. Therefore, since the raw material itself has a strong physical property even though having a low micron thickness, an extra surface of an object should be cut using a tool such as a cutter and the like after lamination is performed in a heat-sealing manner.

Further, there is another conventional method in which the object is roller-coated using synthetic resin solution and then dried. This method has a drawback in that since the synthetic resin solution is the one where the synthetic resin is liquefied in an organic solvent, the print ink is in contact with the organic solvent in the printed character or picture and the like provided as the object so that the object can be seen as a spread matter, and a toxic gas is generated due to evaporation of the organic solvent.

In order to solve the above drawback, Korean Patent Application No. 10-1998-0002504 discloses a laminating method where a surface of a releasing paper and synthetic resin film or a surface of the synthetic resin film having a releasing property is laminated by using a polyethylene solution in which polyethylene is liquefied in the organic solvent and then the organic solvent of a membrane coated on a mold- released surface is completely evaporated through a drying process to form a laminating sheet, and then the laminating sheet is laminated on the printed adhered matter such that the polyethylene coating membrane (thin film) layer of the laminating sheet is transferred to the surface of the adhered matter. However, the above method has a disadvantage in that the laminated surface is weak in heat resistance, in that waterproof and solvent resistance are deficient, in that the surface is stained or the thin film layer is fragile, and in that the adhering agent and the thin film is also weak in adhesion strength therebetween.

Further, a thin film according to the above method does not require to be cut at the edge portion of the adhered matter, but has an inconvenience in which the laminating sheet should be used having a margin of about 5mm to 10mm with comparison to each edge portion of the adhered matter, and a rear paper is required for receiving an adhesive layer of a remaining surf ce .

Disclosure of the Invention

Accordingly, the present invention is directed to a functional thin laminating film that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a functional thin laminating film for improving conventional drawbacks to have a surface function reinforced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings .

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, there is provided a functional thin laminating film for laminating an adhered matter in such a manner that a thin film layer coated on a laminating sheet is transferred to a surface of the adhered matter, the laminating film including: a base film having a releasing property for allowing to be easily separated from the adhered matter after lamination; a functional thin film layer coated with a resin having a function-reinforcement additive on the base film; and an adhesive layer coated with a heat-sealable resin having a urethane-based resin added thereto, on the functional thin film layer, whereby an edge portion of the laminated matter on the adhered matter is easily cut.

In another aspect of the present invention, there is provided an adhesive layer of the functional thin laminating film is coated with the heat-sealable resin prepared by graft combining a copolymeric polyester resin and a rosin modified phenolic resin or addition-reacting a rosin as a tackifier with an acetic acid vinyl acetate resin, and then adding the urethane-based resin.

In a further another aspect of the present invention, there is provided a functional thin laminating film having a mixture of wax or silicon oil and a thermal-curing accelerator for reinforcing scratch resistance and chemicals resistance, a visible or invisible fluorescent pigment/dye or luminescent pigment for providing a specific security element, a specific chemical agent for revealing a chemical discoloration, other pearl pigment basis, a conductive material, a UV screen agent or the like can be added singly or miscibly, as the additive to reinforce scratch resistance and chemical resistance.

As described above, the functional thin laminating film according to the present invention has an effect in which, though the functional thin laminating film is a thin film, it has a function-reinforcement additive mixed therewith to reinforce a function of protecting the adhered matter from scar or chemical, moisture, heat, ultraviolet and the like. Particularly, the inventive thin laminating film has an advantage in that since the thin laminating film is a thin film body and has an adhesive property, a more firm security function can be provided in case that the thin laminating film is duplicated and used in several folds and a security element is provided every layer. Further, the present invention has an effect in which separate cutting is not required since an interface is easily cut between a laminated surface of the adhered matter and a non-adhered remaining surface of the thin film, and in which the laminated adhered matter can be easily separated using only a tensile strength for separating the surface of the adhered matter.

Furthermore, the present invention has an effect in which due to its flexible membrane layer, its texture equals to that of the adhered matter even after lamination, and in which the thin laminating film can be environment-friendly torn together in case that the adhered matter is a paper, and in which since a general laminating apparatus can be used, workability is good.

Brief Description of the Drawings

The -accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

In the drawings :

FIG. 1 is a section view illustrating a functional thin laminating film according to a preferred embodiment of the present invention; and

FIG. 2 is a view illustrating a use state of a functional thin laminating film according to a preferred embodiment of the present invention.

Best Mode for Carrying Out the Invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to accompanying drawings .

As shown in FIG. 1, the functional thin laminating film according to the present invention includes a base film 10; a functional thin film layer 20 coated on the base film 10 with a resin having an additive mixed therewith to reinforce a function of a surface of an adhered matter; and an adhesive layer 30 coated on the functional thin film layer 20. As shown in FIG. 2, the adhesive layer 30 is, by. a laminating method, in contact with the adhered matter 40 intended for protection and passes through a hot laminator together with the base film 10, and then the adhered matter 40 is detached from the base film 10. If so, the adhesive layer 30 and the functional thin film layer 20 can be clearly cut to form a cut portion 50 such that the adhered matter can be laminated.

The base film 10 can use a paper (peeling paper) or high molecular synthetic resin film that is treated with a releasing agent, or a high molecular synthetic resin film that is not treated with the releasing agent, to provide a peeling property depending on a composition of a primary functional thin resin film being a surface material. At this time, the base film 10 has a thickness of appropriately 11 to 15 microns.

The functional thin film layer 20 includes a resin forming a thin film layer, and the additive for function reinforcement of a thin film. At this time, the composition of the resin forming the functional thin film layer should satisfy the following condition.

First, the resin used in the present invention should be able to receive the functional additive when various functional additives are miscible. The resin itself basically has a characteristic of solvent resistance, water resistance, waterproof and the like at a certain level. However, so as to solve the deficiency of heat resistance, waterproof, water solvent and the like of the surface of the laminated thin film that has been indicated as the drawback of the conventional art, the inventive laminating film is characterized in that the additive is miscible for reinforcing the function. Therefore, the resin being a base material of the thin film should be able to receive the additive when several additives are miscible. In order to satisfy the aforementioned, a polymer of poly-vinyl and acrylic resin, a polymer of urethane resin and acrylic resin, a polymer of polyester and denatured acryl, or the like can be used.

Second, since the functional thin film layer 20 should not be peeled and separated from the adhesive layer 30 after completion of laminating, the resin used in the present invention is required to have a strong bonding strength with an adhesive agent material being a secondary thin film. In order to achieve this, the resin can use a polymeric-type high-molecular stage resin, a melamine resin or a UV (Ultraviolet) curing resin prepared by polymerizing a urethane-based resin, a polyester-based resin, a vinyl-based resin, an acryl-based resin or a mixed resin thereof.

Third, even in a combined state of the functional thin film layer 20 and the adhesive layer 30, a composition condition should be provided such that the combined result is easily cut in a Z-direction of a contact point of the laminated adhered surface and the remaining surface.

Additionally, the inventive functional laminating film is characterized by having the additive as well as the resin being the base material added to reinforce the function of the surface laminated on the adhered matter that is intended for protection. As the additive used in the present invention, a mixture of wax or silicon oil and a thermal- curing accelerator for reinforcing scratch resistance and chemicals resistance, a visible or invisible fluorescent pigment/dye or luminescent pigment for providing a specific security element, a specific chemical agent for revealing a chemical discoloration, besides, pearl pigment basis, a conductive material, a UV screen agent or the like can be added singly or miscibly.

A heat-sealable resin is coated on the functional thin film layer 20 to form the adhesive layer 30, and the adhesive layer 30 reinforces the bonding force between the functional thin film layer 20 and the adhered matter 40. After lamination, the adhesive layer 30 can be thermally fused to prevent the surface of the adhered matter 40 from being air- layered or stained.

A heat-sealable hot melt resin generally used is ethyl vinyl acetate, methyl metacrylate, low molecular polyethylene, polyester, polypropylene and the like, and is coated in a T-die extrusion or dry lamination method to form the adhesive layer.

In case of the dry lamination method, as a tackifier, rosin, rosin derivative or Terpens polymer, a petroleum-based hydro carbon resin, a phenolic resin and the like are mixed and used. For its example, rosin polyester 25-125 and petroleum-based wax 40-120 are mixed for an ethyl vinyl acetate resin 100, or the phenolic resin is used as a contact adhesive on neoprene or nytril. In this case, wettability and adhesion are advantageously increased.

Specifically, in the present invention, a urethane resin in addition to a heat-sealable synthetic resin is graft combined with the adhesive layer so as to allow the thin film layer to be easily cut by only detaching the adhered matter 40 from the base film 10 without using a knife or a cutter after lamination. Due to the relatively high molecular urethane resin having weak molecular-bonding among a polymer chain of the heat-sealable resin, if a force is applied, a strong Z-strength of the edge portion of the adhered matter causes intermolecular bonding to be easily broken such that an X-directional tear-strength of the adhesive layer can be intentionally reduced.

This can be understood to be similar with a basic principle of a stamping foil for allowing a gold foil and the like to be coated only on a wanted character or pattern by using a heat applied. That is, the stamping foil is to coat the heat-sealable resin on an aluminum deposition surface in a dry lamination method. It is based on a principle in which when a thermal-fused adhesive resin is thermally transferred on ink of the character or pattern or the like, an deposited aluminum particle is attached only on the character or pattern of the adhered matter due to its remarkable low X and Y-bonding force.

However, the stamping foil has a considerable technical difference in that the present invention employs a chemical method for graft combining the heat-sealable resin with the resin having a property opposite thereto, so as to intentionally reduce the X-bonding force on the thin film of a synthetic resin basis.

Considering the above, it is desirable that a copolymer polyester resin and a rosin modified phenolic resin as the tackifier are graft combined with each other and then are blended with the urethane resin to prepare and use the heat- sealable resin forming the adhesive layer 30.

At this time, the rosin basis used as the tackifier is graft combined with an acetic vinyl acetate resin and is blended with the urethane resin such that the same effect can be also obtained.

On the other hand, a manufacturing process of the functional thin laminating film according to the present invention is described as below.

The functional thin film layer is coated on the base film 10 to have a thickness of 1 to 5 microns in a micro gravure-roll coating method, a kiss-roll coating method, a comma-coater coating method, a reverse-roll coating method, a knife coating method and the like. The bonding strength with the functional thin film layer is considered such that the second adhesive layer is adjusted to have a viscosity adapted to a coater with an appropriate solvent and dilution rate to be coated on the functional thin film layer in a thickness of 4 to 10 microns. At this time, it is desirable that the micro gravure or comma coater method is used for a uniform surface of the adhesive layer. Specifically, it is desirable that the functional thin film layer has a thickness of 3 to 5 microns, and the adhesive layer has a thickness of 5 to 7 microns for providing a cutting effect after lamination. A preferred embodiment of the present invention is described hereinafter.

First Embodiment

An oil ink prepared by graft polymerizing a urethane resin basis 85%, an acrylic resin basis 5% and a minor additive (catalyst, curing agent and the like) and graft combining a function-reinforcement additive is coated on a polyester film in a thickness of 5 microns to form the functional thin film layer. A heat-sealable adhesive having a copolymeric polyester resin, an appropriate quantity of rosin-based tackifier, a urethane resin that are mixed with one another is coated and dried on the dried functional thin film layer in a thickness of 7 microns.

At this time, as a function-reinforcement additive, any one of an invisible fluorescent pigment, a transparent organic conductive agent, a solvent discoloration type/thermal discoloration type discoloring agent, a colored dye, a mixture of the invisible fluorescent pigment and the UV screen agent, a mixture of a transparent organic conductive agent and the UV screen agent, and a mixture of silicon oil and a thermal curing accelerator can be selected.

Second Embodiment

An oil ink prepared by graft polymerizing a urethane resin basis 10%, an acrylic resin basis 60% and a minor additive (catalyst, curing agent and the like) and graft combining a function-reinforcement additive is coated on a polyester film in a thickness of 5 microns to form the functional thin film layer. A heat-sealable adhesive having a copolymeric polyester resin, an appropriate quantity of rosin-based tackifier, a urethane resin mixed with one another is coated and dried on the dried functional thin film layer in a thickness of 7 microns.

Third Embodiment

An oil ink prepared by graft polymerizing a urethane resin basis 10%, an acrylic resin basis 60% and a minor additive (catalyst, curing agent and the like) and graft combining a function-reinforcement additive is coated on a polyester film in the thickness of 5 microns to form a functional thin film layer. A heat-sealable adhesive having an appropriate quantity of rosin-based tackifier and a urethane resin mixed with a denatured polyethylene acetate resin is coated and dried on the dried functional thin film layer in the thickness of 7 microns .

Fourth Embodiment

An oil ink prepared by graft polymerizing a polyvinyl resin 10%, an acrylic resin basis 60% and a minor additive (catalyst, curing agent and the like) and graft combining a function-reinforcement additive is coated on a polyester film in the thickness of 5 microns to form the functional thin film layer. A heat-sealable adhesive having an appropriate quantity of phenolic-based tackifier and a urethane resin mixed with a denatured polyethylene acetate resin is coated and dried on the dried functional thin film layer in the thickness of 7 microns.

Fifth Embodiment

An oil ink prepared by graft polymerizing a polyvinyl resin 10%, a polyester resin basis 30% and a minor additive (catalyst, curing agent and the like) and diluting the graft polymerized result using a solvent is coated on a polyester film in the thickness of 5 microns to form the functional thin film layer. A heat-sealable adhesive having an appropriate quantity of phenolic-based tackifier and a urethane resin mixed with a denatured polyethylene acetate resin is coated and dried on the dried functional thin film layer in the thickness of 7 microns.

At this time, as a function-reinforcement additive, any one of an invisible fluorescent pigment, a transparent organic conductive agent, a solvent discoloration type/thermal discoloration type discoloring agent, a colored dye, a mixture of the invisible fluorescent pigment and a UV screen agent, and a mixture of a transparent organic conductive agent and the UV screen agent can be selected.

Urethane resin basis 10%, Transparent organic urethane-based resin acrylic reins basis 60% conductive agent (UV screen agent)

Polyvinyl resin basis 10%, Solvent-discoloration type Denatured polyethylene acrylic resin basis 20% /thermal-discoloration type acetate resin, discoloring agent phenolic-based tackifier,

Polyvinyl resin basis 10%, Colored dye urethane-based resin polyvinyl ester resin basis

30%

Industrial Applicability

As described above, the functional thin film laminating film according to the present invention can use a conventional laminator device to laminate the printed matter of the document, the card and the like or the digital printing matter of the picture and the advertisement matter. Even after lamination, the laminating film can, due to its thinness, maintain the almost identical texture while it can effectively protect the adhered matter from an external environment of moisture, UV and the like. Accordingly, the inventive thin laminating film can be variously used in the advertisement matter, books and the like. In particular, the inventive thin laminating film has an advantage in that work can be. more easily performed since the interface of the laminated adhered surface and the non-adhered remaining surface of the thin film is easily cut thereby not needing the separate cutting, and the laminating film can be easily separated from the laminated adhered matter by only the tensile strength for separating the surface of the adhered matter. Further, the inventive thin laminating film can provide the security element for the film to be also used for preventing forgery/alteration of various documents.

While the present invention has been described and illustrated herein with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention that come within the scope of the appended claims and their equivalents .

Claims

1. A functional thin laminating film for laminating an adhered matter in such a manner that a thin film layer coated on a laminating sheet is transferred to a surface of the adhered matter, the laminating film comprising: a base film having a releasing property for allowing to be easily separated from the adhered matter after lamination; a functional thin film layer coated with a resin having a function-reinforcement additive on the base film; and an adhesive layer coated with a heat-sealable resin having a urethane-based resin added thereto, on the functional thin film layer, whereby an edge portion of the laminated matter on the adhered matter is easily cut.

2. The functional thin laminating film according to claim 1, wherein the adhesive layer is coated with the heat- sealable resin prepared by graft combining a copolymeric polyester resin and a rosin modified phenolic resin and then adding a urethane-based resin such that the edge portion of the laminated matter on the adhered matter is easily cut.

3. The functional thin laminating film according to claim 1, wherein the adhesive layer is coated with the heat- sealable resin prepared by addition-reacting a rosin as a tackifier with an acetic acid vinyl acetate resin and then adding the urethane-based resin such that the edge portion of the laminated matter on the adhered matter is easily cut.

4. The functional thin laminating film according to claim 2 or 3 , wherein the adhesive layer is coated with the heat-sealable resin having the urethane resin as an additive to have a thickness of 4 to 10 microns.

5. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated with any one base material selected from a polymer of polyvinyl and acrylic resin, a graft polymer of urethane and acryl or a polymer of denatured polyester and acryl having a function-reinforcement additive to have a thickness of 1 to 5 microns .

6. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated with a resin having a mixture of wax or silicon oil and thermal curing accelerator as the additive to reinforce scratch resistance and chemical resistance.

7. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated with a resin having a fluorescent pigment, a fluorescent dye or a luminescent pigment as the additive to provide a specific security element.

8. The functional thin laminating film according to claim 1, wherein the functional thin film is coated with a resin having a specific chemical or a pearl pigment basis as the additive to reveal chemical discoloration.

9. The functional thin laminating film according to claim 1, wherein the functional thin film is coated with a resin having a conductive material as the additive to provide conductivity.

10. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated with a resin having a UV (Ultraviolet) screen agent as the additive .

11. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated to have a thickness of 3 to 5 microns, and the adhesive layer is coated to have a thickness of 5 to 7 microns.

12. The functional thin laminating film according to claim 1, wherein the functional thin film layer is coated to have a thickness of 5 microns, and the adhesive layer is coated to have a thickness of 7 microns.