KR20210027639A - Rubber Adhesive double sided tape with good impact resistance - Google Patents

Abstract

The present invention relates to a rubber-based double-sided adhesive tape capable of improving impact resistance and heat resistance of an adhesive layer and, more specifically, to a rubber-based double-sided adhesive tape comprising: a carrier film including a thermoplastic polyurethane; a first adhesive layer bonded to a first side of the carrier film and including a styrene-isoprene-styrene copolymer and a tackifier; and a second adhesive layer coupled to a second side of the carrier film, wherein the tackifier includes: a terpene-based resin having a softening point of 100 to 150°C; and a hydrocarbon-based resin having a softening point of 100 to 160°C.

Description

Rubber Adhesive double sided tape with good impact resistance

The present invention relates to a rubber-based double-sided adhesive tape with improved impact resistance and a method of manufacturing the same. More specifically, the present invention relates to a rubber-based double-sided adhesive tape having improved impact resistance without a pore structure, and a method of manufacturing the same.

In recent years, in various electronic devices such as mobile phones, displays, and touch screen panels (TSPs), adhesive tapes including, for example, a pressure sensitive adhesive (PSA) have been applied for bonding or lamination of components.

The adhesive tape typically includes a carrier film and an adhesive layer. For example, Patent Document 1 discloses a double-sided tape containing a PSA-based adhesive layer. In the case of the adhesive layer used in electronic devices, impact resistance is required to protect the accessory against external impact and prevent separation of the adherend.

In addition, there is a need to improve the problem of remaining residue when the adhesive tape is separated so as to facilitate replacement and repair of accessories.

1. Republic of Korea Patent Publication 10-2010-0004869 (2012.08.27)

An object of the present invention is to provide a rubber-based double-sided adhesive tape having improved impact resistance and bonding force between an adhesive layer and a carrier film.

The rubber-based double-sided adhesive tape according to exemplary embodiments of the present invention for achieving the object of the present invention described above is a carrier film comprising a thermoplastic polyurethane, bonded to the first surface of the carrier film, and styrene-isoprene -It includes a first adhesive layer comprising a styrene copolymer and a tackifier and a second adhesive layer bonded to the second side of the carrier film. The tackifier includes a terpene-based resin having a softening point of 100°C to 160°C, and a hydrocarbon-based resin having a softening point of 100°C to 150°C.

According to one embodiment, the thermoplastic polyurethane is obtained through the reaction of a polyether-based polyol and isophorone diisocyanate.

According to an embodiment, the styrene-isoprene-styrene copolymer has a weight average molecular weight of 200,000 to 1,000,000, a styrene content of 5 to 25% by weight, and a glass transition temperature of -60°C to -20°C.

According to an embodiment, the content of the tackifier with respect to 100 parts by weight of the styrene-isoprene-styrene copolymer is 20 parts by weight to 40 parts by weight.

According to an embodiment, the tackifier includes 30% to 50% by weight of the terpene-based resin and 50% to 70% by weight of the hydrocarbon-based resin.

According to an embodiment, the tackifier further includes at least one selected from the group consisting of rosin-based resins and petroleum-based resins.

According to an embodiment, the thickness of the carrier film is 5 μm to 50 μm, and the thickness of the first adhesive layer is 10 μm to 50 μm.

According to an embodiment, the adhesive layer does not contain separate pores or foams.

According to an embodiment, the second adhesive layer has the same configuration as the first adhesive layer.

As described above, according to exemplary embodiments of the present invention, it is possible to improve the impact resistance and heat resistance of the adhesive layer, and increase the bonding force between the adhesive layer and the carrier film to prevent residue from remaining on the adherend during the separation operation. can do.

In addition, as the adhesive layer and the carrier film having a low elastic modulus and a high limiting deformation force are applied, it is possible to prevent and easily remove the adhesive tape from being broken due to tensile force when the adhesive tape is removed.

However, the subject and effect of the present invention are not limited to those mentioned above, and may be variously extended without departing from the spirit and scope of the present invention.

1 is a cross-sectional view showing a rubber-based double-sided adhesive tape according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is intended to illustrate specific embodiments and describe in detail in the text, as various changes may be made and various forms may be applied. However, this is not intended to limit the present invention to a specific form disclosed, it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention. In the accompanying drawings, the dimensions of the structures are shown to be enlarged than the actual size for clarity of the present invention.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, elements, or combinations thereof described in the specification, but one or more other features or numbers It is to be understood that the possibility of the presence or addition of, steps, actions, components, or combinations thereof is not preliminarily excluded.

Unless otherwise defined, all terms used herein including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessive formal meaning unless explicitly defined in this application. Does not.

1 is a cross-sectional view showing a rubber-based double-sided adhesive tape according to an embodiment of the present invention.

Referring to FIG. 1, an adhesive tape 100 according to an embodiment of the present invention includes a carrier film 10 and an adhesive layer bonded to the carrier film 10. For example, the adhesive layer includes a first adhesive layer 22 bonded to the first surface of the carrier film 10 and a second adhesive layer 24 bonded to the second surface of the carrier film 10. Can include. The adhesive tape 100 may further include a release film bonded to the adhesive layer. For example, the adhesive tape 100 further includes a first release film 32 bonded to the first adhesive layer 22 and a second release film 34 bonded to the second adhesive layer 24. Can include. The release films may be removed when the adhesive tape 100 is used.

According to an embodiment, the carrier film 10 includes thermoplastic urethane. For example, the thermoplastic urethane may be obtained by reacting a polyether-based polyol and a diisocyanate compound.

For example, the polyether-based polyol may be obtained by addition polymerization of an oxirane compound. For example, the oxirane compound may include an alkylene oxide (AO) such as ethylene oxide (EO), propylene oxide (PO), and butylene oxide (BO), or may include tetrahydrofuran (THF). . Each of these may be used alone or in combination.

For example, an alkylene oxide adduct which is an active hydrogen-containing compound may be used as the polyether-based polyol. Specifically, the polyether-based polyol may include polyethylene glycol (PEG), polypropylene glycol (PPG), polytetramethylene glycol, or a combination thereof. For example, the hydroxy group equivalent (molecular weight/number of hydroxy groups) of the polyether-based polyol may be about 200 to 3,000.

For example, the diisocyanate compound is hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, 4,4-dicyclohexymethane diisocyanate, p-tetramethylxylene diisocyanate, xylene diisocyanate. , Trimethyl-hexamethylene diisocyanate, toluene diisocyanate, or combinations thereof. According to an embodiment, the diisocyanate compound may include isophorone diisocyanate.

According to an embodiment, the carrier film 10 may further include a pigment. For example, the carrier film 10 may contain 5 to 30% by weight of a pigment such as titanium oxide.

According to an embodiment, the adhesive layer includes a styrene-isoprene-styrene copolymer. Styrene-isoprene-styrene copolymer is a rubber-based resin and has superior elasticity and ductility compared to other rubber-based resins. Therefore, the impact resistance of the adhesive tape can be improved.

The weight average molecular weight of the styrene-isoprene-styrene copolymer may be about 200,000 to 1,000,000. For example, in the styrene-isoprene-styrene copolymer, the styrene content may be about 5 to 25% by weight, and the isoprene content may be about 75 to 95% by weight. When the weight average molecular weight of the styrene-isoprene-styrene copolymer is less than 200,000, adhesion may decrease. In addition, when the styrene content is less than 10% by weight, stability at high temperature may be reduced, and when the styrene content is more than 17% by weight, adhesion may be reduced.

According to an embodiment, the glass transition temperature of the styrene-isoprene-styrene copolymer may be about -60°C to -20°C.

According to an embodiment, the adhesive layer further includes a tackifier. For example, the content of the tackifier with respect to 100 parts by weight of the styrene-isoprene-styrene copolymer in the adhesive layer may be about 30 to 40 parts by weight. When the content of the tackifier is excessive, the hardness of the adhesive layer may increase, thereby reducing impact resistance.

According to an embodiment, the tackifier may include a terpene-based resin and a hydrocarbon-based resin. According to the present invention, by mixing a terpene-based resin as a polar resin and a hydrocarbon-based resin as a non-polar resin as a tackifier, it is possible to have excellent adhesion to adherends having different properties. In addition, by increasing the adhesion of the adhesive layer to the urethane-based carrier film 10, it is possible to prevent or minimize residues on the adherend when the adhesive tape is removed.

According to an embodiment, the terpene-based resin may have a softening point of about 100°C to 150°C, and preferably, a softening point of about 130°C to 140°C. When the softening point of the terpene-based resin is excessively low, the heat resistance of the adhesive layer may decrease. The softening point of the hydrocarbon-based resin may be about 100°C to 160°C, preferably about 100°C to 130°C, and more preferably about 110°C to 120°C. When the softening point of the hydrocarbon-based resin is excessively low, the hardness of the adhesive layer may increase and impact resistance may decrease.

According to an embodiment, the tackifier may include about 30 to 50% by weight of the terpene-based resin and about 50 to 70% by weight of the hydrocarbon-based resin. According to an embodiment, the content of the hydrocarbon-based resin may be higher than the content of the terpene-based resin. When the content of the terpene-based resin is insufficient, the heat resistance of the impregnated layer may be reduced, and when the content of the hydrocarbon-based resin is insufficient, the adhesion to the non-polar adherend may be decreased.

The tackifier may further include other resins as needed. For example, the tackifier may further include a rosin-based resin, a petroleum-based resin, and the like.

The adhesive layer may further include process oil. For example, the process oil may include a paraffinic oil, a naphthenic oil, an aromatic oil, or a combination thereof.

For example, in the adhesive tape 100 according to an embodiment, the thickness of the carrier film may be 5 µm to 50 µm, and preferably 10 µm to 30 µm. The thickness of the adhesive layers 22 and 24 may be 10 µm to 50 µm, and preferably 10 µm to 40 µm.

According to an embodiment, the adhesive layer has a solid structure that does not include a micro-balloon structure such as foam or pores. The adhesive layer having a micro-balloon structure can increase the surface roughness and increase the required thickness of the adhesive layer for forming the balloon structure.

According to the present invention, it is possible to improve the surface roughness and increase the required thickness by removing the microballoon structure from the adhesive layer. In addition, it is possible to improve the impact resistance and heat resistance of the adhesive layer, and by increasing the bonding force between the adhesive layer and the carrier film, it is possible to prevent residues from remaining on the adherend during the separation operation. For example, the adhesive tape may be removed without residue by adding a solvent such as ethanol.

In addition, as the adhesive layer and the carrier film having a low elastic modulus and a high limiting deformation force are applied, it is possible to prevent and easily remove the adhesive tape from being broken due to tensile force when the adhesive tape is removed.

Hereinafter, the effects of the present invention will be described through specific examples and experimental examples.

Example 1

Styrene-isoprene-styrene copolymer (weight average molecular weight of about 500,000, styrene content of about 15% by weight, Glass transition temperature of about -55°C) With respect to 100 parts by weight of the resin solid content, 15 parts by weight of a terpene-based resin (softening point of about 135°C) and 20 parts by weight of a mixture of a hydrocarbon-based resin (softening point of about 115°C) are mixed as a tackifier. It was coated and dried to obtain an adhesive tape having an adhesive layer having a thickness of about 20 μm.

Comparative Example 1

As a comparative example, an adhesive tape was prepared in substantially the same manner as in Example 1, except that 15 parts by weight of a terpene-based resin having a softening point of about 135°C and 20 parts by weight of a terpene-based resin having a softening point of about 110°C were used as a tackifier. Got it.

A DuPont impact test (a weight at which a weight was freely dropped, an impact was applied to a specific part, and the height at which the tape and the adherend were separated-the potential energy-was measured) on the adhesive tapes obtained in Example 1 and Comparative Example 1. In the impact experiment, magnesium was used as a first adherend and a battery pouch was used as a second adherend, and the obtained results are shown in Table 1 below.

[Table 1]

Referring to Table 1, compared to Comparative Example 1 using only a terpene-based resin, Example 1 in which a terpene-based resin and a hydrocarbon-based resin were mixed was significantly improved in impact resistance to adherends having different polarities. I can confirm.

The adhesive waterproof tape according to the above-described exemplary embodiments according to the above-described exemplary embodiments may be used in combination with, for example, a display device such as a mobile phone, an OLED device or an LCD device, a TSP, a battery, and the like. .

Although the above has been described with reference to embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

100: adhesive tape
10: carrier film
22, 24: adhesive layer
32, 34: release film

Claims (9)

A carrier film comprising a thermoplastic polyurethane;
A first adhesive layer bonded to the first surface of the carrier film and comprising a styrene-isoprene-styrene copolymer and a tackifier; And
Including a second adhesive layer bonded to the second surface of the carrier film,
The tackifier includes a terpene-based resin having a softening point of 100° C. to 150° C. and a hydrocarbon-based resin having a softening point of 100° C. to 160° C., a rubber-based double-sided adhesive tape. The rubber-based double-sided adhesive tape according to claim 1, wherein the thermoplastic polyurethane is obtained through a reaction of a polyether-based polyol and isophorone diisocyanate. The method of claim 1, wherein the styrene-isoprene-styrene copolymer has a weight average molecular weight of 200,000 to 1,000,000, a styrene content of 5 to 25% by weight, and a glass transition temperature of -60°C to -20°C. Rubber-based double-sided adhesive tape. The rubber-based double-sided adhesive tape according to claim 1, wherein the content of the tackifier with respect to 100 parts by weight of the styrene-isoprene-styrene copolymer is 30 parts by weight to 40 parts by weight. The rubber-based double-sided adhesive tape according to claim 1, wherein the tackifier comprises 30% to 50% by weight of the terpene-based resin and 50% to 70% by weight of the hydrocarbon-based resin. The rubber-based double-sided adhesive tape according to claim 1, wherein the tackifier further comprises at least one selected from the group consisting of rosin-based resins and petroleum-based resins. The rubber-based double-sided adhesive tape according to claim 1, wherein the carrier film has a thickness of 5 µm to 50 µm, and the first adhesive layer has a thickness of 10 µm to 50 µm. The rubber-based double-sided adhesive tape according to claim 1, wherein the first adhesive layer does not contain pores or foams. The rubber-based double-sided adhesive tape according to claim 1, wherein the second adhesive layer has the same configuration as the first adhesive layer.

Images