JPH11335651A - Aqueous adhesive composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aqueous adhesive composition expressing excellent heat resistance after cured, having excellent safety, and having excellent in all of characteristics comprising adhesion to plastic sheets, dry tackiness at the ordinary temperature, and permeability into porous materials in a dry state in fields such as profile wrapping and dry lamination. SOLUTION: This aqueous adhesive composition comprises (A) the below- described main agent component and (B) the below-described curing agent component. The main agent component A contains (a1 )-(a3 ) the below-described components as main components. The component a1 is a polyurethane emulsion having at least one of a primary amino group and a secondary amino group in the molecule. The component a2 is a synthetic rubber latex. The component a3 is an amine compound having two or more amino groups comprising primary amino groups and/or secondary amino groups in the molecule. The component B is a compound having two or more glycidyl groups in the molecule.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel aqueous adhesive composition used in fields such as profile wrapping and dry lamination, and more particularly to a two-part, room temperature-curable aqueous adhesive composition. It is.

[0002]

2. Description of the Related Art Conventionally, in the field of automobile interiors, when a skin material such as a polyolefin foam member used for manufacturing door trims and instrument panels is bonded to a base material such as a plastic member or a wood member, An aqueous two-part adhesive is used. For example, JP-A-61-533
No. 78 discloses an aqueous two-part adhesive using, as main components, an acrylic emulsion obtained by copolymerizing a vinyl monomer having a glycidyl group and an epoxy resin emulsion, and various amine compounds as a curing agent component. Are listed. This aqueous two-part adhesive exhibits excellent initial adhesiveness in the field of automobile interiors and also has excellent heat resistance after curing.

On the other hand, in the field of current profile wrapping, a polyurethane-based two-component solvent-type adhesive mainly using a solvent such as methylene chloride and a water-based adhesive using an ethylene-vinyl acetate copolymer emulsion or the like are used. Is used. The polyurethane two-component solvent-type adhesive has excellent heat resistance and initial adhesiveness, and is made of polyvinyl chloride (P).
VC) It is also excellent in adhesion to a plastic sheet such as a sheet, and the water-based adhesive can exhibit initial tackiness by semi-wet adhesion. In the field of dry lamination, the same two-component solvent-type adhesives and water-based polyurethane adhesives as those used in the field of profile wrapping are used.

[0004]

However, the water-based two-component adhesive described in the above-mentioned Japanese Patent Application Laid-Open No. 61-53378 is used in the field of automobile interiors, and usually the adhesive film or the adherend is heated. The dry tack at room temperature is insufficient because it is used in a reactivated state. Therefore, when the water-based two-part adhesive is applied to the field of profile wrapping, the material is not easily set, the adhesion to a plastic sheet is poor, and when a PVC sheet or the like is adhered, interfacial peeling or the like occurs. In addition, the water-based two-component adhesive has a problem that it is inferior in heat resistance to a polyurethane-based two-component solvent adhesive currently used in the field of profile wrapping. For these reasons, the water-based two-part adhesive cannot be directly applied to the field of profile wrapping.

[0005] Further, in the polyurethane-based two-component solvent-based adhesives conventionally used in the field of profile wrapping, a large amount of solvent is volatilized in an adhesive coating step and a drying step, so that the labor safety of workers is increased. There are problems such as hygiene problems, high risk of environmental pollution, and high equipment costs for disaster prevention. On the other hand, the water-based adhesive used in the field of profile wrapping is excellent in safety, but because of the semi-wet adhesion, it is necessary to finely control the dry state of the adhesive and is inferior in workability, Poor heat resistance. The water-based polyurethane adhesive conventionally used in the field of dry lamination has a problem that a large amount of heat energy is required at the time of reactivation, and the solvent-based adhesive is Similarly, it has safety issues.

The present invention has been made in view of such circumstances, and in the field of profile wrapping, dry lamination, and the like, the present invention relates to adhesion to a plastic sheet, dry tack at room temperature, and dryness to a porous material. It is an object of the present invention to provide a water-based adhesive composition which is excellent in all the properties of permeability, exhibits excellent heat resistance after curing, and has excellent safety.

[0007]

Means for Solving the Problems In order to achieve the above-mentioned object, the water-based adhesive composition of the present invention firstly contains the following main component (A) and curing agent component (B). Make a summary. (A) of the following _{(a 1) ~ (a 3} ) main agent component composed mainly of components. (A ₁ ) A polyurethane emulsion having at least one of a primary amino group and a secondary amino group in one molecule. (A ₂ ) Synthetic rubber latex. (A ₃ ) An amine compound having at least one of a primary amino group and a secondary amino group in one molecule. (B) A compound having two or more glycidyl groups in one molecule.

[0008] A second gist of the aqueous adhesive composition of the present invention is that it contains the following main component (C) and curing agent component (D). (C) the following _{(c 1) ~ (c 3} ) main agent component composed mainly of components. (C ₁ ) A polyurethane emulsion having at least one of a primary amino group and a secondary amino group in one molecule. (C ₂ ) a tackifier resin emulsion. (C ₃ ) an imine compound. (D) A compound having two or more glycidyl groups in one molecule.

It is a contradictory matter for an adhesive to have an excellent dry tack at room temperature, a good permeability to a porous material, and an excellent heat resistance after curing. The present inventors have intensively studied each component in order to obtain a water-based adhesive composition having all of these characteristics and having the same adhesion to a plastic sheet as a solvent-based adhesive. Therefore, as a result of repeated studies to obtain the above-mentioned various performances, it was thought that a system was required to form a cured product by using a low-molecular-weight oligomer such as a thermosetting resin, whereby these were highly crosslinked. On the other hand, no water-based thermosetting resin was found to have high adhesion to a plastic sheet, and it was difficult to introduce a high-grade crosslinking system with a so-called pressure-sensitive adhesive. Therefore, as a result of further research and development, we have found a system that uses a polymer extremely plasticized by low molecular weight components before curing, and that these low molecular weight components themselves are highly crosslinked to form a cured product. That is, an aqueous adhesive composition containing the specific main component (A) and the curing agent component (B) or an aqueous adhesive composition containing the specific main component (C) and the curing agent component (D) is used. It has been found that the intended purpose can be achieved by using the same, and the present invention has been achieved. As described above, the water-based adhesive composition of the present invention uses the hardener component [(B) or (D)] having abundant functional groups to form a main component [(A) or a dry tack-free component at room temperature. (C)] can be plasticized, and they themselves are highly crosslinked and solidified, so that no liquid component remains in the cured adhesive film. In addition, by using a specific polyurethane emulsion [(a ₁ ) or (c ₁ )] as the main component [(A) or (C)], it is possible to prevent a decrease in physical properties of the film due to phase separation. The adhesiveness with respect to can be ensured.

[0010]

Next, an embodiment of the present invention will be described.

The water-based adhesive composition of the present invention is roughly classified into 2
Can be divided into two modes. The water-based adhesive composition of the first embodiment can be obtained using the specific main component (A) and the curing agent component (B). Further, the water-based adhesive composition of the second embodiment can be obtained by using a specific main component (C) and a curing agent component (D).

First, the water-based adhesive composition of the first embodiment will be described. The specific main agent component used in the aqueous adhesive composition of the first embodiment (A) has a specific polyurethane emulsion (a ₁ component), a synthetic rubber latex (a ₂ component), the specific amine compound (a _{And (3} components).

The specific component which is a constituent component of the main component (A)
Polyurethane emulsion (a₁Component) within one molecule
At least one of a primary amino group and a secondary amino group
It has one. This particular polyurethane emulsion
John (a₁The component) is not particularly limited, and the main chain
Or polyurethane with the above amino group introduced into the side chain.
It can be obtained by emulsifying in water. In addition, the first
In the water-based adhesive composition of the embodiment, the one molecule
At least one of a primary amino group and a secondary amino group
Having a polyurethane emulsion (a₁Ingredient)
Has both a primary amino group and a secondary amino group.
It is also possible to use polyurethane emulsion which is not used
It is. In this way, a polyurethane emulsion is used in combination.
If a ₁The component is 3 of the whole polyurethane emulsion
It is preferable that the content be 0% by weight or more.

The above specific polyurethane emulsion (a
The _{one-component)} as well as constituting the main agent component (A) synthetic rubber latex (a ₂ component) is not particularly limited, acrylonitrile - butadiene copolymer rubber (NBR), styrene - butadiene copolymer rubber (SBR), chloroprene rubber (CR), natural rubber (NR) and the like, and these are used alone or in combination of two or more. Among them, NBR is particularly preferable in terms of adhesion to a plastic sheet represented by a PVC sheet and transfer of a plasticizer contained in the PVC sheet to an adhesive film. The synthetic rubber latex (a ₂ component) has a glass transition point (Tg) 0
C. or lower is preferred.

The specific polyurethane emulsion (a)
₍₁ component) and synthetic rubber latex (a ₂ component) together with a specific amine compound (a ₃ ) constituting the main component (A).
Component) has at least one of a primary amino group and a secondary amino group in one molecule. Note that “having at least one of a primary amino group and a secondary amino group in one molecule” is, for example, 1
When the molecule has two or more primary amino groups only, 1
When the molecule has only two or more secondary amino groups, 1
It refers to a case where each molecule has one or more primary amino groups and secondary amino groups. The specific amine compound as (a ₃ component) is not particularly limited as long as the compound was dissolved by itself room temperature in the liquid or water in a liquid state,
Examples thereof include aliphatic polyamines such as polyamidoamine, ethylenediamine, and triethylenetetramine, polyether polyamines, and caseins, which are used alone or in combination of two or more. Among these, polyamidoamine is particularly preferred in terms of reactivity and dry tack. In addition,
In the present invention, the above specific amine compound (a ₃ component)
Is the main component (C) of the water-based adhesive composition of the second embodiment.
It refers to excluding constituting the imine compound (c ₃ component).

The main component (A) has the above-mentioned a ₁ to
It may be composed only of a _3-component, also above a ₁
It is also possible in addition to ~a ₃ component is contained other ingredients. The other components are not particularly limited, and include, for example, conventionally known acrylic resin emulsions.

As the curing agent component (B) used together with the specific main component (A), a compound having two or more glycidyl groups in one molecule is used. Examples of the compound having two or more glycidyl groups in one molecule include:
There is no particular limitation, polyglycidyl ether of polyhydric phenol or alkylene oxide adduct of this polyhydric phenol, polyglycidyl ether of hydrogenated product of polyhydric phenol or alkylene oxide adduct of this polyhydric phenol, aliphatic polyalcohol And the like, and these can be used alone or in combination of two or more. Examples of the polyglycidyl ether of the above-mentioned polyhydric phenol or an alkylene oxide adduct of the polyhydric phenol include bisphenol A-type diglycidyl ether, bisphenol A-type ethylene oxide, and diglycidyl ether of a propylene oxide adduct. Examples of the polyglycidyl ether of the above-mentioned polyhydric phenol or the hydrogenated product of an alkylene oxide adduct of this polyhydric phenol include hydrogenated bisphenol A-type polyglycidyl ether. Examples of the polyglycidyl ether of the aliphatic polyalcohol include glycerin triglycidyl ether, 1,6-hexanediol diglycidyl ether, and diglycidyl ether of castor oil. The compound having two or more glycidyl groups in one molecule is emulsified by an ordinary method and used as an emulsion.

The specific polyurethane emulsion (a)
₍₁ component), the synthetic rubber latex (a ₂ component), and the specific amine compound (a ₃ component) at a compounding ratio (solid content weight ratio) of a ₁ / a ₂ / a ₃ = 90/5 / 5-5 20/30
/ 50 is preferred, and a ₁ / a ₂ / a ₃ = 90/5/5 to 50/30/20 is particularly preferred.
It is. That is, the ratio of the specific polyurethane emulsion (a ₁ component) is more than 90, dry at room temperature tack, tends to be insufficient permeability to the porous material is observed, is less than 20, represented PVC sheet This is because the adhesiveness and heat resistance to the plastic sheet to be used tend to decrease.

The main component (A) and the curing agent component (B)
A / B = 100/2
The ratio is preferably set in the range of 100 to 100/100, and particularly preferably A / B = 100/20 to 100/80. That is, when the curing agent component (B) is less than 2, the dry tack at room temperature and the permeability to porous materials tend to decrease, and the curing agent component (B) is less than 10%.
If it exceeds 0, the adhesiveness and the heat resistance to a plastic sheet represented by a PVC sheet tend to decrease.

When other components such as the above-mentioned acrylic resin emulsion are contained in the main component (A), it is preferable that the content is set in the range of 1 to 40% by weight of the whole main component (A).

Next, the water-based adhesive composition of the second embodiment will be described. Wherein said specific main agent component (C) used in the aqueous adhesive composition of the second aspect, the specific polyurethane emulsion (c ₁ component), a tackifier resin emulsion (c ₂ component), imine compound (c
_{And (3} components).

[0022] The main agent component (C) components at a particular polyurethane emulsion (c ₁ component), a specific polyurethane which is a constituent of the main agent component of the aqueous adhesive composition of the first aspect (A) those similar to the emulsion (a ₁ component) and the like. Incidentally, in the above-described second aqueous adhesive composition of embodiment, with polyurethane emulsion (c ₁ component) having at least one primary amino group and secondary amino group in the molecule, primary amino It is also possible to use a polyurethane emulsion having neither a group nor a secondary amino group in combination. When a polyurethane emulsion is used in combination, c ₁
It is preferable that the content of the component is 30% by weight or more of the entire polyurethane emulsion.

The above specific polyurethane emulsion (c)
The _{one-component)} with the tackifier resin emulsion that constitutes the main agent component (C) (c ₂ component), obtained by emulsifying a tackifier resin in the usual methods. As the tackifying resin is not particularly limited, rosin, rosin esters, polymerized rosin, rosin disproportionation rosin, C ₅ resins, C ₉ resins, C ₅ · C ₉ petroleum resin such as a resin, terpene Terpene phenols such as resin, terpene phenol resin, and rosin-modified terpene phenol resin are exemplified. In particular, it is preferable to use a rosin-based resin. It is preferable to use a resin having a softening point of 60 ° C. or higher as the tackifying resin. That is, when the softening point is lower than 60 ° C., the heat resistance tends to be inferior.

The above specific polyurethane emulsion (c)
₁ component) and tackifier resin emulsion ( ₂ component c)
Together with the imine compound (c ₃ ) constituting the main component (C).
The component) is not particularly limited as long as it is a compound which itself is liquid at room temperature or shows a liquid state by being dissolved in water. Examples thereof include ethyleneimine (aziridine), monoimine such as propyleneimine, diimine such as piperazine, and polyethyleneimine. Polyimine and the like are used alone or in combination of two or more. Among these, polyethyleneimine is particularly preferable in terms of blending stability and appropriate reactivity with a curing agent. Moreover, the imine compound (c ₃ component) is preferably one having a molecular weight of 200 to 80,000,
Particularly preferably, it has a molecular weight of 200 to 2,000.

The main component (C) has the above-mentioned c ₁ to
It may be composed of only the c ₃ component, and the above c ₁
It is also possible in addition to to c ₃ component is contained other ingredients such as a plasticizer.

The curing agent component (D) used together with the specific main component (C) is the same as the curing agent component (B) in the aqueous adhesive composition of the first embodiment.

The above specific polyurethane emulsion (c)
₁ component) and tackifier resin emulsion ( ₂ component c)
And the imine compound (c ₃ component) compounding ratio (solid content weight ratio) is c ₁ / c ₂ / c ₃ = 90/5/5 to 40/30.
/ 30, particularly preferably c ₁ / c ₂ / c ₃ = 80/15/5 to 50/30/2.
0. That is, the ratio of the specific polyurethane emulsion (c ₁ component) is more than 90, dry at room temperature tack, tends to be insufficient permeability to the porous material is observed, is less than 40, adhesion with respect to PVC sheet This is because there is a tendency for the properties to decrease.

The main component (C) and the curing agent component (D)
(C / D = 100/2)
The ratio is preferably set in the range of 100 to 100/100, particularly preferably C / D = 100/20 to 100/80. That is, when the amount of the curing agent component (D) is less than 2, there is a tendency that the dry tack at room temperature and the permeability to the porous material tend to be insufficient.
This is because, if it exceeds 300, the adhesiveness to the PVC sheet and the heat resistance tend to decrease.

When other components such as the plasticizer are contained in the main component (C), one component of the entire main component (C) is used.
It is preferable to set so as to be in the range of ４０40% by weight.

Next, the method for producing the aqueous adhesive composition of the present invention shown in the first and second embodiments will be described. The aqueous adhesive composition of the first embodiment can be prepared, for example, as follows. That is, first, the specific polyurethane emulsion (a ₁ component)
When prepared with synthetic rubber latex (a ₂ component), the specific amine compounds (a ₃ component) and the main agent component blended with (A). Next, a curing agent (B) comprising a compound having two or more glycidyl groups in one molecule is blended with the main component (A) to obtain the desired aqueous adhesive composition of the first embodiment. Can be obtained. The water-based adhesive composition of the first embodiment includes, in addition to the specific main component (A) and the curing agent component (B), a thickener and a plasticizer generally used in water-based adhesives. Other additives such as a humectant, a filler and the like can be blended as required.

The water-based adhesive composition of the second embodiment can be prepared in the same manner as in the method of producing the water-based adhesive composition of the first embodiment. That is, first, the the specific polyurethane emulsion (c ₁ component), a tackifier resin emulsion (c ₂ component), imine compound (c ₃
Component) to prepare a main component (C). Next,
By blending a curing agent (D) comprising a compound having two or more glycidyl groups in one molecule with the main component (C), an intended aqueous adhesive composition of the second embodiment is obtained. Can be. The water-based adhesive composition of the second embodiment includes, in addition to the specific main component (C) and the curing agent component (D), a thickener and a plasticizer generally used in a water-based adhesive. Other additives such as a humectant, a filler and the like can be blended as required.

Next, examples will be described together with comparative examples.

[0033]

Examples 1-4 The components shown in Table 1 below were blended in the proportions shown in the same table, and the aqueous adhesive composition of the first embodiment was prepared by the above-mentioned method.

[0034]

[Table 1]

[0035]

Examples 5 to 8 The components shown in Table 2 below were blended in the proportions shown in the same table, and the aqueous adhesive composition of the second embodiment was prepared by the above-mentioned method.

[0036]

[Table 2]

[0037]

Comparative Example 1 A two-part adhesive composition was prepared in the following manner according to the method described in JP-A-61-53378. That is, the tackifying resin emulsion and the epoxy resin emulsion shown in Table 3 below are dissolved in toluene so as to have a concentration of 50% by weight. On the other hand, the above-mentioned resin toluene solution was emulsified by an inversion method in which an aqueous solution of an emulsifier shown in Table 3 below was gradually dropped over 30 minutes under high-speed stirring with a homomixer to prepare an aqueous emulsion. On the other hand, a polyamide resin shown in Table 3 below was dissolved in water at a ratio shown in the same table with stirring to prepare an aqueous solution of a curing agent. Then, a tertiary amino group-containing acrylate polymer emulsion prepared in advance (Primal E-1)
126, manufactured by Rohm and Haas Company, solid content 60%)
50 parts by weight of the aqueous emulsion and 10 parts by weight of the aqueous solution of the curing agent were mixed with 100 parts by weight to prepare a two-part adhesive composition.

[0038]

[Table 3]

[0039]

Comparative Example 2 First, a commercially available thermoplastic polyurethane resin (Desmocol 400) 20 was added to 70 parts by weight of methylene chloride.
By weight, 10 parts by weight of a tackifier resin (Tamanol 100S) were added to obtain a base material having a solid content of 30%. Then, a commercially available C-MDI (Desmodur 44V20) as a curing agent was added thereto, and the main agent / curing agent = 100/5 by weight ratio.
The two components were mixed at such a ratio as to obtain a two-component solvent type adhesive.

[0040]

Comparative Example 3 An ethylene-vinyl acetate emulsion adhesive was obtained by adding 5% of toluene to 55 parts (solid content) of a commercially available ethylene-vinyl acetate emulsion (Sumikaflex 400) and stirring for 1 hour. Was prepared.

[0041]

Comparative Example 4 An aqueous lapping adhesive was prepared in the following manner according to the method described in JP-A-8-157799. That is, a stirrer, thermometer, reflux condenser,
15 parts of ion-exchanged water was charged into a container having a dropping funnel, and the temperature was raised to 80 ° C. On the other hand, methacrylic acid 8 parts, 2
-43 parts of ethylhexyl acrylate, 27 parts of butyl acrylate, 15 parts of methyl methacrylate, 7 parts of vinyl acetate, 0.03 part of lauryl mercaptan, and 35.5 of water
And 2 parts of Levenol WZ (polyoxyethylene alkyl ether sodium sulfate, manufactured by Kao Corporation) were emulsified with a homomixer to prepare a mixed emulsion. 5% of the mixed emulsion was precharged into the above solution, and at the same time, 0.6 part of a 5% aqueous ammonium persulfate solution was added to start emulsion polymerization. Then
After 10 minutes, the remaining mixed emulsion and 5.4 parts of a 5% ammonium persulfate aqueous solution were added dropwise over 3 hours. During this time, the temperature inside the container was kept at 80 ° C. After completion of the dropwise addition, the container was aged for 2 hours while maintaining the inside temperature at 80 ° C. Thereafter, the mixture was cooled to 30 ° C. or lower, and 0.5 parts of aqueous ammonia was added. The resulting synthetic resin emulsion had a solid content of 63.1% and a viscosity of 4
It was 300 cps (30 ° C., BH type, 10 rpm). Next, the solid content 1 of the obtained synthetic resin emulsion was
To 00 parts, 10 parts of a urethane emulsion (Superflex 750, solid content 40%, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) was added at a solid content of 10 parts and mixed to prepare an intended aqueous lapping adhesive. The resulting water-based wrapping adhesive is
Solid content concentration 61.0%, viscosity 2300 cps, pH5.
It was 5.

Using the thus obtained adhesive compositions of Examples 1 to 8 and Comparative Examples 1 to 4, comparative evaluations were made on the initial adhesiveness, heat resistance and safety according to the following criteria. . The results are shown in Tables 4 and 5 below.

[Initial Adhesive Property] First, each adhesive composition was applied on a PVC sheet at a rate of 30 g / m ² (dry), and dried in a dryer at 60 ° C. for 3 minutes (1 in the case of a solvent type adhesive).
(5 seconds). Then, it is stuck on an MDF board (medium specific gravity fiber board) and deaerated lightly with a rubber roller.
Pressing was performed at room temperature under a pressure of 3 kgf / cm ² for 1 second.
Then, immediately after the pressure was released, the PVC sheet was forcibly peeled off by hand. At this time, those in which the adhesive was transferred to the MDF plate by 80% or more in visual area ratio were indicated by ○, and those in which the adhesive was less than 80% were indicated by ×.

[Heat Resistance] A test piece bonded in the same procedure as in the evaluation of the initial adhesiveness was cured at 20 ° C. and 65% RH for one week, and a test piece having a width of 25 mm was cut out. After the PVC sheet of this test piece was left in a dryer at 60 ° C. for 10 minutes, a static load of 500 g was applied to one end of the PVC sheet and left as it was for 24 hours. The peel length at this time is 10 mm
The following items were indicated by ○, and those exceeding 10 mm were indicated by x. The evaluation was performed on three test pieces, and the results were evaluated based on the average value.

[Safety] The safety was evaluated as x when the volatile organic solvent occupied 5% by weight or more of the whole, and as ○ when the volatile organic solvent was less than 5% by weight of the whole.

[0046]

[Table 4]

[0047]

[Table 5]

From the results shown in Tables 4 and 5, Example 1 was obtained.
The aqueous adhesive composition of the first embodiment of Examples 4 to 4 and Examples 5 to 5
It can be seen that the water-based adhesive compositions of the second embodiment of No. 8 are all excellent in initial adhesion, heat resistance and safety.

On the other hand, the adhesive compositions of Comparative Examples 1, 3, and 4 all have excellent safety, but on the other hand, it is found that the initial adhesiveness and heat resistance are extremely poor. This is because adhesion is performed in a completely dried state at 60 ° C. for 3 minutes, and therefore, the adhesive is particularly low in dry tack and permeability to the MDF plate, and the initial adhesiveness is insufficient.
Further, since the initial adhesiveness is insufficient, it is not possible to obtain good heat-resistant creep performance. The two-component solvent-type adhesive composition of Comparative Example 2 has both excellent initial adhesiveness and heat resistance, but on the other hand, uses an organic solvent, and thus is extremely inferior in safety. .

[0050]

As described above, the aqueous adhesive composition of the present invention contains the specific main component (A) and the curing agent component (B), or contains the specific main component (C) and the specific main component (C). Contains a curing agent component (D). As described above, by using the curing agent component [(B) or (D)] having abundant functional groups, the main component component [(A) or (C)], which is a polymer, can be plasticized, and the polymer itself is highly sophisticated. The liquid component does not remain in the cured adhesive film because it is crosslinked and solidified. In addition, by using a specific polyurethane emulsion [(a ₁ ) or (c ₁ )] as the main component [(A) or (C)], it is possible to prevent a decrease in physical properties of the film due to phase separation. The adhesiveness with respect to can be ensured. And, since the water-based adhesive composition of the present invention is aqueous, there is no problem of evaporation of the solvent, and in the bonding operation,
There is no effect on the safety of humans such as workers. Conventionally, it was necessary to provide various facilities for the safety and hygiene of workers and prevention of disasters. However, by applying the present invention, it is not necessary to provide such facilities, so that facility costs can be reduced. Become. Therefore, the water-based adhesive composition of the present invention can be applied to fields such as profile wrapping and dry lamination, and in particular, in the field of profile wrapping, it can exhibit excellent heat resistance, and can be used for dry lamination. In the field, there is an effect that the heat can be reactivated at a lower temperature as compared with the conventional water-based adhesive.

Claims (4)

[Claims] 1. An aqueous adhesive composition comprising the following main component (A) and curing agent component (B). (A) of the following _{(a 1) ~ (a 3} ) main agent component composed mainly of components. (A ₁ ) A polyurethane emulsion having at least one of a primary amino group and a secondary amino group in one molecule. (A ₂ ) Synthetic rubber latex. (A ₃ ) An amine compound having at least one of a primary amino group and a secondary amino group in one molecule. (B) A compound having two or more glycidyl groups in one molecule. 2. The aqueous adhesive composition according to claim 1, wherein the amine compound as the component (a ₃ ) is a polyamidoamine. 3. An aqueous adhesive composition comprising the following main component (C) and curing agent component (D). (C) the following _{(c 1) ~ (c 3} ) main agent component composed mainly of components. (C ₁ ) A polyurethane emulsion having at least one of a primary amino group and a secondary amino group in one molecule. (C ₂ ) a tackifier resin emulsion. (C ₃ ) an imine compound. (D) A compound having two or more glycidyl groups in one molecule. 4. The aqueous adhesive composition according to claim 3, wherein the imine compound as the component (c ₃ ) is polyethylene imine.