TW201700276A - Adhesive film for automobile - Google Patents

Abstract

The present invention relates to a vehicle adhesive film comprising: an acrylic foam layer; a rubber-based adhesive layer formed on one surface or both surfaces of the acrylic foam layer; and a primer layer between the acrylic foam layer and the rubber-based adhesive layer, wherein the primer layer comprises a Cl-containing composition.

Description

Automotive bonding film

The present invention relates to a bonded film for automobiles.

Conventionally, as a use in which a bonding force or a shear strength is required under normal temperature conditions, for example, in various fields such as automobiles, machine parts, electronic products, and building materials, decompression bonding tapes or sheets are used in joining between members. . Such a decompression-bonding member is prepared, for example, by curing a binder composition containing a (meth)acrylate alkyl ester as a monomer main component by ultraviolet rays.

Recently, a vacuum-reducing bonding tape having a core layer containing a rubber-based decompressive adhesive has been marketed, and an adhesive tape for automobiles not only needs to withstand an exposed environment such as ultraviolet rays (UV) and rain for a long time, but also needs to withstand An external physical shock or vibration, etc., and thus an acrylic foam tape is applied.

In response to this, a rubber-based adhesive and an acrylic foam tape containing the same are studied, and the rubber-based adhesive has excellent durability and reliability in a harsh environment, but has a problem of lowering the adhesive force with the acrylic foam.

Problem to be solved by the invention

In order to solve the above problems, the present invention provides a bonding film for automobiles, comprising a primer layer formed of a composition containing Cl, thereby increasing the bonding force between the acrylic foam layer and the rubber-based bonding layer, thereby having excellent adhesion and durability. .

Technical means of solving problems

In order to solve the above problems, an adhesive film for an automobile is provided in an example of the present invention, the adhesive film for an automobile comprising: an acrylic foam layer; a rubber-based adhesive layer formed on one side of the acrylic foam layer or both sides of the acrylic foam layer; And a primer layer formed between the acrylic foam layer and the rubber-based adhesive layer, wherein the primer layer comprises a Cl-containing composition.

The present invention can provide a bonded film for automobiles, and the above Cl-containing composition comprises a chlorinated polyolefin (CPO) resin and a binder resin.

The present invention can provide a bonded film for automobiles, and the chlorinated polyolefin resin has a degree of chlorination of 0.0001% by mass to 0.001% by mass.

The present invention can provide a bonding film for automobiles, wherein the binder resin is selected from the group consisting of polyurethane, polyamide, polyester, polyether, polycarbonate, and combinations thereof. At least one of the group consisting of.

The present invention can provide a cementitious film for automobiles, wherein the above Cl-containing composition comprises a methyl propyl ketone, methyl ethyl ketone, methyl isobutyl ketone selected from the group consisting of methyl propyl ketone, methyl ethyl ketone, and methyl isobutyl ketone. A solvent of at least one of the group consisting of toluene, xylene, and a combination thereof.

The present invention can provide a bonded film for automobiles comprising 5 to 20 parts by weight of the above chlorinated polyolefin resin and 1 to 5 parts by weight of the above binder resin with respect to 100 parts by weight of the above Cl-containing composition.

The present invention can provide a bonded film for automobiles, and the solid content of the above Cl-containing composition is 10 to 25 wt%.

The present invention can provide a bonding film for automobiles, wherein the rubber-based bonding layer comprises a material selected from the group consisting of isoprene rubber, styrene rubber, polybutadiene rubber, and acrylonitrile-butadiene (acrylonitrile). Butadiene) At least one of the group consisting of rubber, butyl rubber, polychloroprene rubber, urethane rubber, and acrylic rubber.

The present invention can provide a bonded film for automobiles, which is selected from the group consisting of styrene-isoprene-styrene block copolymers and styrene-butadiene-styrene (styrene- Butadiene-styrene) block copolymer, styrene-butylene-styrene block copolymer, styrene-propylene-styrene block copolymer, acrylonitrile At least one selected from the group consisting of acrylonitrile-butylene-styrene copolymers and various carboxylic acid derivatives thereof.

The present invention can provide a bonding film for automobiles, and the rubber-based bonding layer further comprises a tackifier and a plasticizer.

The present invention can provide a bonded film for automobiles in which the styrene content is 15 to 20% by weight.

The present invention can provide a bonded film for automobiles, wherein the acrylic foam layer contains a (meth)acrylate ester monomer having an alkyl group having 1 to 12 carbon atoms and acrylic acid.

The present invention can provide a bonding film for automobiles, which is 85 to 95% by weight of the above (meth) acrylate monomer and 5 to 15% by weight of the above acrylic acid.

The present invention can provide a bonded film for automobiles, wherein the acrylic foam layer contains 0.01 to 100 parts by weight of a composition comprising a (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms and acrylic acid. 1 part by weight of a photoinitiator and 0.1 to 2 parts by weight of a crosslinking agent.

The present invention can provide a bonded film for automobiles, and the above primer layer has a thickness of 4 μm to 6 μm.

Control the efficacy of prior art

The adhesive film for automobile of the present invention comprises a layer containing a primer of Cl, and has the advantages of maintaining excellent adhesion between the acrylic foam and the rubber-based adhesive layer, and having excellent external impact and absorption, and having low surface energy. Excellent bonding performance.

Advantages, features, and methods of achieving the advantages and features of the present invention are apparent from the various embodiments described hereinafter. However, the present invention is not limited to the various embodiments disclosed below, and can be implemented in various ways that are different from each other. This embodiment is only used to complete the disclosure of the present invention, and can be used in the technical field of the present invention. The scope of the invention is fully understood by the person skilled in the art, and the invention is defined only by the scope of the claimed invention. Throughout the specification, the same reference numerals denote the same structural elements.

The present inventors introduced a primer layer including a Cl-containing composition between a rubber-based adhesive layer and an acrylic foam in the course of research on a bonded film for automobiles, thereby confirming that the rubber was maintained while maintaining the prescribed durability. The excellent bonding force between the bonding layer and the acrylic foam, and completed the present invention.

The invention provides a bonding film for an automobile, wherein the bonding film for an automobile comprises: an acrylic foam layer; a rubber-based bonding layer formed on one side of the acrylic foam layer or both sides of the acrylic foam layer; and a primer layer containing a Cl-containing composition Formed between the above acrylic foam layer and the rubber-based adhesive layer.

Automotive bonding film

Primer layer

In order to improve the bonding ability between the rubber-based adhesive layer and the acrylic foam layer, the present invention provides the above-mentioned primer layer by finally realizing an adhesive film for automobiles having excellent adhesion.

The primer layer may comprise a Cl-containing composition, and in particular, the above-mentioned Cl-containing composition may be applied and then dried to form a primer layer.

Further, the Cl-containing composition may include a chlorinated polyolefin resin and a binder resin.

In the above chlorinated polyolefin resin, Cl may be contained in the above primer layer, so that ionic bond between Cl of the primer layer and hydrogen of the acrylic foam layer can be achieved.

Further, when the aging treatment is performed by heat after laminating the respective layers, physical bonding between the rubber-based adhesive layer and the primer layer is achieved, whereby the bonding property between the rubber-based adhesive layer and the acrylic foam layer can be improved.

The conventional rubber-based adhesive layer has an excellent durability and reliability in a harsh external environment as compared with an acrylic adhesive layer excellent in adhesion to an acrylic foam layer, but has a problem that the adhesion to the acrylic foam is lowered.

In the present invention, in the present invention, by including a primer layer containing the above-described Cl-containing composition between the acrylic foam layer and the rubber-based adhesive layer, it is possible to achieve the above-mentioned problems and to have excellent adhesion and durability. conjunctiva.

In the chlorinated polyolefin resin, a part of hydrogen in a polymer such as ethylene chloride or propylene chloride is substituted with chlorine. At this time, the weight of chlorine relative to the total weight of the chlorinated polyolefin resin is referred to as the degree of chlorination.

The chlorinated polyolefin resin may have a chlorination degree of from about 0.0001% by mass to about 0.001% by mass, and specifically, the chlorination degree may be from about 0.0001% by mass to about 0.0005% by mass.

In the case where the chlorination degree is less than 0.0001% by mass, there is a concern that the bonding ability of the two phases as a primer layer is lowered in the interface between the acrylic acid and the rubber phase, and in the case where the chlorination degree is more than 0.001% by mass, Concerns about the possibility of producing environmentally unfriendly products due to the detection of excess halogen.

Therefore, the chlorinated polyolefin resin having the above chlorination degree is contained in the above range, thereby realizing a primer layer containing an appropriate amount of Cl to improve the bonding property of the film.

Further, the above Cl can be contained in an amount of from 0.001 mg to 0.01 mg, specifically, from 0.003 mg to 0.005 mg, so as not to exceed the environmentally harmful substance reference value.

The above chlorinated polyolefin resin may be a resin having a specific degree of chlorination alone, or a plurality of resins having different degrees of chlorination may be used in combination.

The binder resin may be at least one selected from the group consisting of polyurethane resins, polyamide resins, polyester resins, polyether resins, polycarbonate resins, and combinations thereof.

In particular, the above polyamide resin can be easily mixed with other components, and is excellent in mechanical strength, heat resistance, abrasion resistance, flexibility, and low-temperature characteristics, and can achieve high bonding strength, and is most preferable.

The above composition may comprise a plurality of solvents, non-limiting examples of which may be at least one selected from the group consisting of methyl propyl ketone, methyl ethyl ketone, methyl isobutyl ketone, toluene, xylene, and combinations thereof. One, preferably, may be toluene and xylene.

The above-mentioned binder resin may be contained in an amount of from about 5 to about 20 parts by weight of the above chlorinated polyolefin resin, and from about 1 to about 5 parts by weight, per 100 parts by weight of the above Cl-containing composition.

When the amount of the chlorinated polyolefin resin used is less than about 5 parts by weight, there is a problem that the effect of improving the bonding strength is insufficient. When the amount of the chlorinated polyolefin resin used is more than about 20 parts by weight, the above is present. Concerns about reduced solubility in the composition.

Therefore, in order to enhance the adhesion and impact properties of the primer layer, it is most preferable to include the chlorinated polyolefin resin in the above range.

Further, in the case where less than about 1 part by weight of the above binder resin is contained, there is a concern that the viscosity of the composition is lowered and the adhesion is reduced, and in the case where more than about 5 parts by weight of the above binder resin is contained, there is The problem of lower compatibility with other polymers due to a decrease in the cohesive force of the above composition.

The solid content of the above Cl-containing composition may be 10 to 25 weight percent. By adjusting the content of the solid content in the above range, the adhesion, durability, and mechanical strength of the primer layer can be appropriately maintained.

Acrylic foam layer

The above acrylic foam layer contains an acrylic resin. The acrylic resin which can be used in the present invention is not particularly limited, but may include a (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms and acrylic acid.

In this case, when the enthalpy contained in the monomer is an excessively long chain, the cohesive force is lowered, and the glass transition temperature (Tg) or the adhesion property is difficult to be adjusted. Therefore, it is preferable to use a carbon atom of 1 A (meth) acrylate monomer of ～12 alkyl group.

The weight ratio of the (meth) acrylate monomer and the acrylic acid is selected within a range in which the desired effect can be achieved, and is not particularly limited, but preferably, the (meth) acrylate monomer is about It is used in an amount of from 85 to about 95% by weight, and the above acrylic acid is used in an amount of from about 5 to about 15% by weight.

In the case where the above acrylic acid is less than about 5 weight percent, the cohesive force is lowered, and in the case where the above acrylic acid is more than about 15 weight percent, the adhesive force is lowered.

In the above, the kind of the (meth) acrylate type monomer is not particularly limited, and such a monomer may, for example, be an alkyl (meth) acrylate or a methyl (meth) acrylate. (methyl(meth)acrylate), ethyl(meth)acrylate, n-propyl(meth)acrylate,isopropyl methacrylate Isopropyl (meth)acrylate), n-butyl (meth)acrylate, t-butyl(meth)acrylate, sec-butyl (meth)acrylate Ester (sec-butyl (meth)acrylate), pentyl (meth)acrylate, 2-ethyl hexyl (meth)acrylate, ( 2-ethyl butyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate (meth)acrylate), isodecyl (meth)acrylate (isononyl (meth) Acrylate), lauryl (meth)acrylate, tetradecyl (meth)acrylate, etc., one or two of the above monomers may be used in the present invention. More than one mixture.

Further, the acrylic acid copolymerizable with the above (meth) acrylate monomer may be a polar monomer. The above acrylic acid is also not particularly limited, and particularly, preferably, the above acrylic acid is a carboxyl group-containing monomer and/or a nitrogen-containing monomer.

The above-mentioned carboxyl group-containing monomer may, for example, be one or more selected from the group consisting of (meth)acrylic acid, maleic acid, and fumaric acid. As an example of the nitrogen-containing monomer, a group selected from the group consisting of acrylamide, N-vinyl pyrrolidone, and N-vinyl caprolactam can be exemplified. More than one.

In the acrylic foam layer of the present invention, the composition comprising a (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms and acrylic acid may further comprise a photoinitiator and a crosslinking agent.

The photoinitiator described above is reacted by irradiation with ultraviolet rays or the like during the formation of the acrylic foam layer to initiate a curing reaction of the composition. In the above, as the photoinitiator, a photoinitiator which is generally used in the field can be used without particular limitation.

As an example of the above photoinitiator, a benzoin methyl ether, 2,4,6-trimethylbenzoyl diphenyl phosphine may be exemplified as being selected from the group consisting of benzoin methyl ether and 2,4,6-trimethylbenzoyl diphenyl phosphine. Oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, α,α-methoxy-α-hydroxyl Acetophenone (α,α-methoxy-α-hydroxyacetophenone), 2-benzylidene-2-(dimethylamino)-1-[4-(4-morpholinyl)phenyl]-1-butanone ( 2-benzoyl-2-(dimethylamino)-1-[4-(4-morpholinyl)phenyl]-1-butanone) and 2,2-dimethoxy-2-phenylacetophenone (2,2-dimethoxy) More than one of the groups consisting of -2-phenylacetophenone).

Preferably, the above photoinitiator is added in an amount of 0.01 to 1 part by weight based on 100 parts by weight of the above composition. In the case where less than 0.01 part by weight of the photoinitiator is added, not only the crosslinking cannot be sufficiently achieved, but also the effect of improving the cohesive force may not be obtained, and in the case where more than 1 part by weight of the photoinitiator is added, there is an initial wrinkle ( Tuck) and concerns about significantly reduced adhesion.

The above-mentioned crosslinking agent can adjust the adhesiveness from the viewpoint of improving the cohesive force. The kind of the crosslinking agent which can be used in the present invention is not particularly limited, but preferably, the crosslinking agent is a component which can participate in the reaction by irradiation with ultraviolet rays or the like.

As an example of the above crosslinking agent, one selected from the group consisting of 1,6-hexandiol diacrylate, trimethylolpropane triacrylate, and pentaerythritol triacrylate ( Pentaerythritol triacrylate), 1,2-ethylene glycol diacrylate and 1,12-dodecanediol acrylate One or more of the group consisting of a crosslinking agent, a polyfunctional isocyanate crosslinking agent, and a polyfunctional epoxy crosslinking agent, but is not limited thereto. Preferably, from about 0.1 to about 2 parts by weight of the above crosslinking agent is added with respect to 100 parts by weight of the above composition. In the case where less than about 0.1 part by weight of the crosslinking agent is added, there is a fear that the adhesive force may be lowered, and in the case where more than about 2 parts by weight of the crosslinking agent is added, there is a fear that the cohesive force may be lowered.

In addition to the above photoinitiator and crosslinking agent, as an additive which may be added, a porous filler, a coupling agent, an antistatic agent, a surfactant, a tackifier, a processing oil, etc. may be mentioned, and such an additive may be used. The usual additives in this field are used so as to be appropriately added within the range not impairing the object of the present invention.

Rubber adhesive layer

The rubber-based adhesive layer may comprise selected from the group consisting of isoprene rubber, styrene rubber, polybutadiene rubber, acrylonitrile-butadiene rubber, butyl rubber, polychloroprene rubber, urethane rubber, and acrylic acid. At least one of the group consisting of rubber.

The above rubber is formed with a double bond ring, so that preferably, a styrene rubber having a high hardness is used, and the above styrene rubber may be selected from a styrene-isoprene-styrene block copolymer, styrene-butadiene- Styrene block copolymer, styrene-butylene-styrene block copolymer, styrene-propylene-styrene block copolymer, acrylonitrile-butene-styrene copolymer and various carboxylic acid derivatives thereof At least one of the group consisting of.

In particular, the above styrene rubber may be a styrene-isoprene-styrene (SIS) block polymer. The above styrene-isoprene-styrene block copolymer is one type of rubber-based binder, and belongs to the ABA type polymer, wherein A having an end block is formed of polystyrene and B of a rubber intermediate block is aggregated. A molecular model of isoprene-forming thermoplastic elastomers.

The styrene-isoprene-styrene block copolymer used in the present invention is not particularly limited, but usually, the solution viscosity (MPa•s [cps], 25 ° C) is about 1000 to 3000. Preferably, the styrene-isoprene-styrene block copolymer is contained in an amount of 10 to 30% by weight based on the total composition of the rubber-based adhesive layer. If the content of the styrene-isoprene-styrene block copolymer is less than 10% by weight, the cohesive force is insufficient. On the other hand, if the content of the styrene-isoprene-styrene block copolymer is more than 30 If the weight percentage is insufficient, the adhesion is insufficient, which is not preferable.

Also, in the above styrene rubber, the styrene content may be from about 15 to about 20% by weight. The above styrene is used as a hard segment, and the content of styrene may affect the physical properties of the entire rubber. The more the amount of styrene increases, the more the thermoplasticity of the rubber increases.

When the styrene content of the present invention is less than 15% by weight, there is a concern that cohesive force may be insufficient. When the styrene content is more than 20% by weight, there is a problem that the adhesive strength is lowered due to high hardness. The styrene content is preferably 15% by weight or more in terms of durability of the binder. Preferably, the styrene content is from 16 to 18 weight percent.

Further, the rubber-based adhesive layer may further contain a tackifier and a plasticizer.

The tackifier is not particularly limited, and for example, a substituted saturated hydrocarbon resin (synthetic petroleum resin), a rosin ester derivative, a terpene resin, a phenol resin, or the like is preferable.

Further, the above-mentioned substituted saturated hydrocarbon resin is not particularly limited, and it is only necessary to contain one or two or more of the above in the present invention.

The content of the above tackifier is not particularly limited, but preferably, the tackifier is contained in an amount of from about 10 to about 150 parts by weight based on 100 parts by weight of the rubber contained in the rubber-based adhesive layer. When the content of the tackifier is less than 10 parts by weight, the adhesive strength is insufficient. On the other hand, when the content of the tackifier is more than 150 parts by weight, the adhesive strength is too strong, and when peeling is performed, foreign matter can be imparted.

The plasticizer is not particularly limited, and examples thereof include higher alcohols such as liquid paraffin, hardened oil, hydrogenated castor oil, and octyldodecanol, squalane, and squalene. Squalene), castor oil, liquid rubber (polybutene), fatty acid esters such as myristic acid isopropyl. In the present invention, one or two or more of the above may be included.

The content of the above plasticizer is preferably from about 1 to about 10 parts by weight based on 100 parts by weight of the rubber contained in the rubber-based adhesive layer. When the content of the plasticizer is less than 1 part by weight, the adhesive layer is excessively cured, and thus the adhesive strength becomes insufficient. On the other hand, if the content of the plasticizer is more than 10 parts by weight, the adhesive layer is too softened and thus becomes sticky or easy to leave.

1 is a schematic cross-sectional view of an adhesive film 100 for an automobile according to an example of the present invention. Most preferably, the acrylic foam layer 10 is about 1000 μm, the primer layer 30 is about 5 μm, and the rubber-based adhesive layer 20 is about 50 μm.

The primer layer of the automotive adhesive film of the present invention may have a thickness of from about 4 μm to about 6 μm.

The thickness of the primerless layer is less than the above range, and the thickness of the primer layer is thicker than the above range, so that when the film is bonded, there is a fear that the phenomenon of extrusion or the adhesiveness is lowered.

Therefore, in the case where the primer layer is formed by the above thickness, excellent adhesion can be achieved between the rubber-based adhesive layer and the acrylic foam layer.

Further, the rubber-based adhesive layer of the above-mentioned automotive adhesive film may further include a base material layer.

As the substrate layer, various plastic films, paper, nonwoven fabric, glass or metal can be used. Specifically, an ester polymer film containing polyethylene terephthalate or polystyrene can be used. A styrene polymer film, an olefin polymer film containing a cyclic olefin polymer, a carbonate polymer film containing polycarbonate, a quinone imine polymer film containing polyimine, and a polyether. a sulfone polymer film of polyethersulfone, a cellulose polymer film containing triacetyl cellulose, or an acrylic polymer film containing polymethyl methacrylate. However, it is not limited to a specific polymer, and can be applied to all polymer films used as a substrate film of a protective film or a binder film.

Hereinafter, a plurality of specific embodiments of the present invention will be disclosed. However, the various embodiments described below are merely illustrative of the invention, and the invention is not limited thereto.

Examples and comparative examples

Example 1

Preparation of acrylic foam layer

In a one liter glass reactor, 90 parts by weight of 2-ethylhexyl acrylate and 10 parts by weight of polar monomer acrylic acid were thermally polymerized to obtain a syrup having a viscosity of 3,500 cP. 0.5 part by weight of a methoxy-a-hydroxyacetophenone (a, a-methoxy-a- as a photoinitiator) was mixed with 100 parts by weight of the obtained syrup. Hydroxyacetophenone)), 0.35 parts by weight of 1,6-hexanediol diacrylate (HDDA, 1,6-hexanediol diacrylate) as a crosslinking agent, followed by thorough stirring. Here, 5 parts by weight of glass bubbles and 2 parts by weight of cerium oxide were mixed and stirred until they were sufficiently uniform. After the above mixture was degassed under reduced pressure by a vacuum pump, an acrylic foam layer having a thickness of 1.0 mm was prepared using a microbar.

Preparation of rubber adhesive layer

A composition was prepared by mixing a styrene-isoprene-styrene linear block copolymer with a toluene solvent. 150 parts by weight of an adhesive-imparting tackifier added to the above composition and stirred for one hour with respect to 100 parts by weight of the above styrene-isoprene-styrene linear block copolymer, at normal temperature conditions Defoaming was carried out to coat the detached polyethylene terephthalate, and then dried in an oven at 80 ° C for 1 minute, dried in an oven at 110 ° C for 2 minutes, and then prepared by ultraviolet curing. A rubber-like bonding layer having a thickness of 50 μm.

Preparation of primer composition

15 parts by weight of a chlorinated polyolefin having a chlorination degree of 0.0005% by mass, 5 parts by weight of a polyamide resin, and stirring at a temperature of 70 ° C in a toluene solvent with respect to 100 parts by weight of the total composition In an hour, a Cl-containing composition having a solid content of 10% was prepared.

Preparation of acrylic foam tape

The primer composition was applied to the rubber-based pressure-sensitive adhesive layer and the acrylic foam layer at a thickness of 5 μm, and bonded with a 5 kg roller, followed by drying to prepare a bonded film.

Comparative example 1

When a primer composition was prepared, a ruthenium oxide primer was used instead of the chlorinated polyolefin, and a bonded film was prepared in the same manner as in Example 1.

Comparative example 2

A bonded film was prepared in the same manner as in Example 1 except that the primer layer was not applied.

Experimental example

1. Initial adhesion evaluation

The test was carried out after attaching for 20 minutes according to the test method of KS A1107.

2. Interface adhesion evaluation (creep)

The bonded film was prepared into a 1×1 inch (horizontal×vertical) test piece to be attached to stainless steel (SUS), and a 1 Kg hammer was attached at a high temperature of 80 ° C to drop the adhesive film. The time was measured 5 times and the average was recorded.

3. Dimensional stability evaluation

After immersing the test piece in the water tank, the basis of the shrinkage ratio of the difference in length measured after being placed in an oven at 80 ° C in the measured length was evaluated as follows: less than 2.0% is good, 2.0 to 2.2% is normal, 2.2%. The above is bad.

The initial adhesion, interfacial adhesion, and dimensional stability evaluation results of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 1 below.

Table 1

As shown in the above Table 1, it is understood that when the primer layer formed of the Cl-containing composition is applied between the acrylic foam layer and the rubber-based adhesive layer, the initial adhesion, the interface adhesion, and the dimensional stability are excellent.

100‧‧‧Automobile bonding film
10‧‧‧Acrylic foam layer
20‧‧‧Rubber bonding layer
30‧‧‧primer layer

Fig. 1 is a schematic cross-sectional view showing a bonded film for an automobile according to an example of the present invention.

100‧‧‧Automobile bonding film

10‧‧‧Acrylic foam layer

20‧‧‧Rubber bonding layer

30‧‧‧primer layer

Claims (13)

An adhesive film for an automobile, comprising: an acrylic foam layer; a rubber-based adhesive layer formed on one side of the acrylic foam layer or both sides of the acrylic foam layer; and a primer layer formed on the acrylic foam layer Between the rubber-based adhesive layers, the primer layer comprises a Cl-containing composition. The automotive adhesive film according to claim 1, wherein the Cl-containing composition comprises a chlorinated polyolefin (CPO) resin and a binder resin. The automotive adhesive film according to claim 2, wherein the chlorinated polyolefin resin has a chlorination degree of 0.0001% by mass to 0.001% by mass. The automotive adhesive film according to claim 2, wherein the adhesive resin is selected from the group consisting of polyurethane, polyamide, polyester, polyether, polycarbonate, and At least one of the group consisting of their combinations. The automotive adhesive film according to claim 2, wherein 5 to 20 parts by weight of the chlorinated polyolefin resin and 1 to 5 parts by weight of the binder resin are contained with respect to 100 parts by weight of the Cl-containing composition. The automotive adhesive film according to claim 1, wherein the rubber-based adhesive layer comprises an epoxy resin selected from the group consisting of isoprene rubber, styrene rubber, polybutadiene rubber, and acrylonitrile-butadiene. At least one of the group consisting of acrylonitrile butadiene rubber, butyl rubber, polychloroprene rubber, urethane rubber, and acrylic rubber. The automotive adhesive film according to claim 6, wherein the styrene rubber is selected from the group consisting of styrene-isoprene-styrene block copolymers and styrene-butadiene-styrene. (styrene-butadiene-styrene) block copolymer, styrene-butylene-styrene block copolymer, styrene-propylene-styrene block copolymer At least one selected from the group consisting of acrylonitrile-butylene-styrene copolymers and various carboxylic acid derivatives thereof. The adhesive film for automobiles of claim 6, wherein the rubber-based adhesive layer further comprises a tackifier and a plasticizer. The automotive adhesive film according to claim 6, wherein in the styrene rubber, the styrene content is 15 to 20% by weight. The automotive adhesive film according to claim 1, wherein the acrylic foam layer comprises a (meth) acrylate ester monomer having an alkyl group having 1 to 12 carbon atoms; acrylic acid. The automotive adhesive film according to claim 10, wherein the (meth) acrylate monomer is 85 to 95% by weight, and the acrylic acid is 5 to 15% by weight. The automotive adhesive film according to claim 1, wherein the acrylic foam layer is a composition of 100 parts by weight of a (meth) acrylate monomer having an alkyl group having 1 to 12 carbon atoms and acrylic acid. It contains 0.01 to 1 part by weight of a photoinitiator and 0.1 to 2 parts by weight of a crosslinking agent. The automotive adhesive film of claim 1, wherein the primer layer has a thickness of from 4 μm to 6 μm.