KR20190080500A - A adhesive tape and seat - Google Patents

Abstract

 A carrier layer; A pressure sensitive pressure sensitive adhesive composition comprising: a pressure sensitive adhesive composition; a pressure sensitive adhesive resin; and a surface active additive; Sensitive adhesive composition on one side or both sides of the carrier layer, wherein the 180 ° peel adhesion strength is 15 N / 25 mm or more and the temperature is 70 to 90 ° C under the initial room temperature condition, Within 10 minutes 180 ° peeling adhesive strength is less than 2N / 25mm, adhesive strength is lowered, and when the temperature is lowered again, 180 ° peel adhesion strength is increased to 15N / 25mm or more Sheet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an adhesive tape or sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an adhesive tape used for attaching in various automobile and various electronic equipment manufacturing processes, and a method for manufacturing an adhesive tape and a sheet, to provide.

Sensitive adhesive tape according to the present invention is a tape or sheet characterized by comprising a temperature sensitive type pressure sensitive adhesive composition having a 180 ° peel adhesion strength of 15 N / 25 mm or more and a high temperature of 70 to 90 캜 under an initial room temperature condition The adhesive strength decreases to less than 2N / 25mm within 10 minutes and 180 ° peel adhesion strength falls to 15N / 25mm or higher when the temperature is lowered again under normal temperature condition. As a result, the temperature-sensitive polymer It is possible to reduce costs such as parts and processes by applying various fields such as automobile and electric and electronic devices, and to prevent waste and pollution of resources and to prevent environmental pollution.

Various kinds of adhesive tapes are used for bonding in manufacturing processes of products such as automobiles and electronic devices. Among the existing adhesive tapes, re-peeling type and high temperature desorption tapes have a problem in that it is necessary to apply a high temperature for a long time or to peel the peelable tape by applying a too high temperature or heat. If a high temperature is applied for a long period of time or if too much heat is applied, there is a possibility that a component may fail to perform its function and there is a limitation in practical use.

In addition, once heat is applied or the high temperature condition is taken, the material is foamed or expanded, stopping the heat application, and having a disadvantage that it can not be returned to the initial adhesive tape state even if the temperature is lowered. It is lost. The inventors of the present invention discovered a temperature sensitive polymeric pressure sensitive adhesive composition having a function capable of performing a desired tape working process at an appropriate temperature by applying a temperature sensitive polymer to solve the above problems. And to provide a method of manufacturing an applied adhesive tape.

The present invention relates to a method for manufacturing a cross-section and a double-sided adhesive tape capable of fixing various electronic products such as mobile phones, smart phones, and OLED TVs and parts used in automobiles, The present invention provides a method of manufacturing a cross-section and a double-sided pressure-sensitive adhesive tape which can be used for manufacturing a pressure-sensitive adhesive tape by applying additives and fixing the parts and components using the adhesive tape. Sensitive adhesive tape according to the present invention comprises a thermosensitive pressure sensitive adhesive composition having a 180 ° peel strength at an initial temperature of 15 N / 25 mm or more and a high temperature of 70 to 90 ° C The adhesive strength is lowered to less than 2N / 25mm within 180 minutes, so that desired work processes such as peeling and desorption can be performed and the temperature is lowered again by the function that is impossible in the existing peeling tape or the high temperature desorption tape And the 180 ° peel adhesion strength is increased to 15 N / 25 mm or more at normal temperature conditions to restore original tape function.

The temperature sensitive double-sided adhesive tape according to the present invention can be manufactured by manufacturing an adhesive tape capable of reusing and reworking expensive parts, and it is possible to fix expensive parts and tapes even after a simple procedure in the existing assembly process, It can rework and shorten the rework time for the parts, which can reduce the process cost. If the assembly process is defective, the tape attached to the part can be easily separated and recycled. It is possible to repair components and repair them by applying temperature sensitive acrylic adhesive tape. Therefore, it is possible to reduce the additional cost, and therefore, it has an excellent effect of cost reduction. If the product or parts can not be recycled, the problem of resource consumption and environmental pollution can be solved.

1 is a view showing a tape or sheet according to an embodiment of the present invention.
2 is a graph showing the measurement data of the first embodiment.
3 is a graph showing measurement data of the second embodiment.

The base material of the temperature sensitive double-sided pressure-sensitive adhesive tape of the present invention may be selected from polyethylene terephthalate (PET), polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polyurethane, polystyrene, (PE FOAM), a composite polyolefin foam (composite PE FOAM), and a thermoplastic polyurethane (TPU) film, as well as a resin film such as polycarbonate, fluorine resin, low density polyethylene and triacetylcellulose, Can be used. The substrate having releasability of the present invention is preferably a polyethylene terephthalate film excellent in elasticity and inexpensive in terms of price, and a release paper such as a release paper, a white paper, a kraft paper, an amorphous paper or a coated paper. The adhesive tape is characterized in that an upper layer and a lower layer are made of an adhesive layer using an acrylic resin, a crosslinking agent, a tackifier resin, and a surface active additive. According to a more preferred feature of the present invention, the pressure-sensitive adhesive layer comprises 1 to 3 parts by weight of a crosslinking agent, 10 to 30 parts by weight of a tackifier resin, 1 to 10 parts by weight of an additive capable of activating the surface, Are mixed with each other.

<Adhesive composition>

As the base adhesive resin constituting the adhesive layer of the present invention, two types of adhesive resins selected from the group consisting of silicon-based, acrylic-based, rubber-based, and urethane-based adhesive resins can be used. The pressure-sensitive adhesive resin is not particularly limited, but it is preferable to use an acrylic pressure-sensitive adhesive resin having a yellowing resistance and an excellent optical property. The PDI (polydispersity index) of the acrylic resin is preferably designed to be in the range of 5 to 12 because the cohesive force increases as the content of the low molecular weight substance in the polymer substance increases and the content of the high molecular weight substance increases. The composition of the acrylic resin is not particularly limited, but may include an acrylate monomer. The acrylic ester monomer may be selected from the group consisting of butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate, Hexyl acrylate, 2-ethylhexyl methacrylate, isononyl acrylate, isononyl methacrylate, or the like can be used. The acrylic monomer of the present invention has a glass transition temperature of

It is preferable to use an acrylic ester monomer in the range of -80 占 폚 to -45 占 폚. The functional monomers which can be used in the present invention are not particularly limited, but monomers such as methacrylic acid, 2-methacryloxy oxyacetic acid, 3-methacryloxypropic acid, 4-methacryloxybutyric acid, fumaric acid, Hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate, 6-hydrohexyl methacrylate, 8-hydroxyoctyl acrylate, 2-hydroxyethyl methacrylate, One or two or more functional monomers selected from the group consisting of methacrylate, 2-hydroxyethylene glycol methacrylate, acrylamide as nitrogen-containing monomer, N-vinylcaprolactam, and the like can be used.

The acrylic pressure-sensitive adhesive resin may be prepared by mixing a pressure-sensitive adhesive base containing an acrylic polymer and a functional group as raw materials and a polymerization initiator into a solvent containing ethyl acetate, acetone, and isopropyl alcohol alone or in combination with toluene, . One of the most common methods of synthesizing the conventional pressure sensitive adhesives is a batch reaction method in which an acrylic polymer, an organic solvent and a polymerization initiator are mixed and stirred in one reaction, and then heated and reacted at a time. This is the preferred method for the synthesis of existing adhesives due to the simplicity of the reaction and the convenience of manufacturing. However, the batch reaction method has a disadvantage in that it is difficult to control the transient explosive reaction and toluene is required for the overall reaction. Toluene is used as a diluent for controlling the instantaneous heat generated during the synthesis of the pressure-sensitive adhesive and for controlling the viscosity of the synthesized pressure-sensitive adhesive, and is also indispensable in the batch reaction method because it is also used as an additive for imparting the coating function . In the present invention, a new solvent composition is developed in order to exclude the use of toluene in the production of an acrylic pressure-sensitive adhesive, and a method of developing the reaction by dividing the total reaction time by a predetermined time (hereinafter referred to as a partial delay reaction method) is used. In the present invention, as a solvent capable of replacing toluene in the partial retardation reaction method, ethyl acetate, acetone and isopropyl alcohol are used singly or in combination, and toluene is not added Develop and provide solvents. Ethyl acetate used as a main solvent enables smooth synthesis of acrylic polymer and can be used as a viscosity controlling diluent for the prepared acrylic polymer. Ethyl acetate exerts optimum performance when the amount added is 30 to 80 parts by weight of the total solvent content. Particularly, the optimum coating performance and the high gloss of the surface are maintained at a total solvent content of 40 to 50 parts by weight. Acetone and isopropyl alcohol exhibit optimal processability when the added amount is within 40 parts by weight of the total solvent amount. Meanwhile, the partial retardation reaction method used in the present invention is a method of modifying physical properties of a polymer and controlling the molecular weight by controlling the reaction time and the initiator during the reaction instead of adding a general low molecular material used for imparting the functionality of the pressure- In which a polymer and a function-imparting small molecule are simultaneously synthesized. The partial delay reaction method of the present invention is preferably an initial reaction step (a-1) in which 30 to 50 parts by weight of the total reactant is pre-reacted; (A-2) inducing polymer growth after the initial reaction is terminated, maintaining the initial reactants sufficiently to grow into the polymer for 0.5 to 4 hours; A post-reaction step (a-3) in which the remaining amount of the whole reactants is successively reacted for 60 to 120 minutes after the induction of polymer growth; An aging step (a-4) for reducing the unreacted monomers after the later reaction, adding an excess amount of the polymerization initiator again for maintaining the conversion rate for 90 to 180 minutes; And a termination step (a-5) of terminating the reaction through quenching, quenching and introduction of a diluent.

&Lt; Production of pressure-sensitive adhesive tape &

A solvent is added to the pressure-sensitive adhesive composition to adjust the viscosity of the pressure-sensitive adhesive composition to a coating viscosity to prepare a coating solution. Thereafter, it is coated on a substrate having releasability and then cured to form an adhesive layer. The base material of the pressure-sensitive adhesive tape is selected from the group consisting of polyethylene terephthalate, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polyurethane, polystyrene, polycarbonate, (PET FOAM), a composite polyethylene foam (composite PE FOAM), a polyethylene phthalate (PET) film, a thermoplastic polyurethane (TPU) film, and the like Can be used. The substrate having releasability of the present invention is preferably a polyethylene terephthalate film excellent in elasticity and inexpensive in terms of price, and a release paper such as a release paper, a white paper, a kraft paper, an amorphous paper or a coated paper. The thickness of the release base material is more preferably from 20 탆 to 150 탆, and more preferably from 23 탆 to 135 탆. The pressure-sensitive adhesive composition is coated by a conventional method such as a bar coating method, a reverse roll coating method, a knife coating method, a roll knife coating method, a gravure coating method and a doctor blade coating method, To 120 탆, and is laminated on both sides of the base material to produce a double-sided pressure-sensitive adhesive tape. The base material of the present invention is preferably a synthetic resin film having a thickness of 1.4 to 75 탆, a polyolefin foam having a thickness of 100 to 1000 탆, a polyurethane foam, a thermoplastic polyurethane or the like, but is not limited to a substrate thickness. The synthetic resin film constituting the substrate may be subjected to surface treatment on both sides by an oxidation method, an irregularization method or the like, if necessary, for the purpose of improving the adhesion with the adhesive layer applied on both surfaces thereof. The oxidation method includes a corona discharge treatment, a crosic acid treatment, a plasma discharge treatment, an ultraviolet ray irradiation treatment and the like. The unevenness method includes a sand blast method and a solvent treatment method. Among them, the corona discharge treatment method is preferable in terms of unit cost and efficiency.

The pressure-sensitive adhesive composition is coated by a conventional method such as a bar coating method, a reverse roll coating method, a knife coating method, a roll knife coating method, a gravure coating method and a doctor blade coating method, To 100 탆, and is laminated on both sides of the base material to produce a double-sided pressure-sensitive adhesive tape.

<Examples>

&Lt; Preparation of acrylic adhesive composition >

40 parts by weight of butyl acrylate monomer (BAM), 55 parts by weight of 2-ethylhexyl acrylate monomer (2-EHA), 5 parts by weight of 2-hydroxyethyl methacrylate monomer (2-HEMA) 50 parts by weight of ethyl acetate as a reaction solvent and 20 parts by weight of acetone were added to prepare a pressure sensitive adhesive composition. Then, the pressure sensitive adhesive composition was diluted with ethyl acetate to a solid content of 35% to prepare an acrylic pressure sensitive adhesive composition .

<Adhesive tape manufacturing>

100 parts by weight of the above acrylic pressure-sensitive adhesive composition, 2 parts by weight of epoxy crosslinking agent, 15 parts by weight of tackifier resin, 1.5 parts by weight of PURECHEM TX-100 as an additive capable of activating the surface and 1.5 parts by weight of PURECHEM TX- Followed by stirring to prepare a thermosensitive pressure-sensitive adhesive article. Thereafter, the release coating film subjected to the silicone release treatment is coated with the coating solution by a comma coating method, dried and cured, applied to a thickness of 10 to 100 탆, laminated on a polyolefin foam fabric having a thickness of 100 to 200 탆, A tape was prepared.

&Lt; Example 1 Measurement Data >

Condition: Adhesive tape was aged at 70 ° C for 10 minutes, then allowed to stand at room temperature,

1. 180 degree peel strength measurement data

(1) Adhesion at room temperature (g / 25 mm): 1945 ( Adhesive strength of adhesive tape before aging at 70 ° C for 10 minutes)

(2) After aging the adhesive tape at 70 占 폚 for 10 minutes and then leaving it at room temperature,

division Room temperature One 2 3 4 5 6 7 8 9
adhesiveness
(g / in) 1945 107 335 536 674 817 1017 1108 1510 1975

&Lt; Example 2 Measurement data >

Condition: Adhesive tape was aged at 70 ° C for 10 minutes, then allowed to stand at room temperature,

-. Temperature-sensitive adhesive force which delayed the increase of adhesive force over time

   => Time to maintain low adhesion

2. 180 degree peel strength measurement data

(1) Adhesion at room temperature (g / 25 mm): 1933 ( Adhesive strength of adhesive tape before aging for 10 minutes at 70 캜)

(2) After aging the adhesive tape at 70 占 폚 for 10 minutes and then leaving it at room temperature,

division Room temperature One 2 3 4 5 6 7 8 9 adhesiveness
(g / in) 1933 78 151 235 437 593 923 1339 1672 1951

10: Adhesive layer
20: substrate

Claims (9)

A carrier layer;
A pressure sensitive pressure sensitive adhesive composition comprising: a pressure sensitive adhesive composition; a pressure sensitive adhesive resin; and a surface active additive;
Sensitive adhesive composition on one side or both sides of the carrier layer, wherein the 180 ° peel adhesion strength is 15 N / 25 mm or more and the temperature is 70 to 90 ° C under the initial room temperature condition, Within 10 minutes 180 ° peeling adhesive strength is less than 2N / 25mm, adhesive strength is lowered, and when the temperature is lowered again, 180 ° peel adhesion strength is increased to 15N / 25mm or more Sheet. The method of claim 1,
Wherein the carrier layer comprises a film carrier, a FOAM carrier, a nonwoven fabric, a woven fabric, an AL sheet, a CU sheet, or the like. The method of claim 2,
Wherein the film carrier is made of a polyethylene terephthalate (PET) film or a thermoplastic polyurethane (TPU) film. The method of claim 2,
Wherein the FOAM carrier comprises a polyolefin FOAM (PE FOAM), a polyurethane FOAM (PU FOAM), and a thermoplastic polyurethane FOAM (TPU FOAM). The method of claim 1,
Wherein the pressure-sensitive adhesive composition comprises 100 parts by weight of an acrylic polymer resin, 10 to 50 parts by weight of a solvent, and 1 to 5 parts by weight of a crosslinking agent. The method of claim 5, further comprising:
The acrylic resin may be at least one selected from the group consisting of butyl acrylate, butyl methacrylate, hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, isooctyl acrylate, isooctyl methacrylate,
Wherein the thermosensitive pressure-sensitive adhesive composition comprises at least one selected from the group consisting of 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isononyl acrylate and isononyl methacrylate. The method of claim 1,
Wherein the tackifier resin is composed of a terpene-phenolic resin, a teprene resin, a phenolic resin, a rosin ester, and a petroleum resin. Sensitive adhesive composition. The method of claim 1,
Wherein the surface active additive comprises an anionic surface active agent, a cationic surface active agent, a nonionic surface active agent, and an amphoteric surface active agent. The method of claim 1,
Wherein the adhesive tape or sheet comprises 100 parts by weight of a pressure sensitive adhesive, 10 to 30 parts by weight of a tackifier resin, and 1 to 10 parts by weight of a surface active additive.

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