JPH05112767A - Aqueous adhesive for polyolefin resin material - Google Patents

Abstract

(57) [Summary] [Objective] To provide an aqueous adhesive for polyolefin resin materials, which satisfies all of the following performances required when the dry lamination method is adopted. 1) The adhesive dried on the surface of the adherend has a wettability to the adherend and a constant initial adhesive strength, 2) these initial adhesive strength and wettability are constant at a constant temperature after drying. It should be maintained for 3 hours, and the initial adhesive force should change to an adhesive force with excellent heat resistance within 48 hours. [Structure] An aqueous adhesive containing, as a main component, an anionic aqueous polyurethane emulsion having a polyolefin-based polyol as a main skeleton, and one or more selected from primary or secondary polyvalent amines and salts thereof in an adhesive weight. 0.1
To 5.0% by weight, and 1 selected from water-soluble high-boiling point organic solvents capable of dissolving or swelling the aqueous polyurethane.
1 to 50% by weight based on the weight of the adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous adhesive used for polyolefin resin materials such as polyethylene and polypropylene, and more particularly to an aqueous adhesive suitable for an adhesion method by a dry lamination method.

[0002]

As an aqueous adhesive suitable for a polyolefin resin material, an anionic aqueous polyurethane emulsion having a polyolefin-based polyol as a main chain was developed by the same applicant as the present application and has already been applied for a patent. Sho 59-113016). This aqueous polyurethane emulsion has an excellent affinity for polyolefin resin materials, and has the advantage that water, which is a pollution-free solvent, can be used, but on the other hand, compared to low-boiling organic solvent type adhesives. However, it has a problem that it becomes water-based, such as long drying time, it is difficult to develop a predetermined strength until it is dried, and further, initial adhesive strength cannot be obtained in a state containing water.

However, by using the adhesion method called the dry lamination method, the problems of the above-mentioned water-based adhesive can be solved, and it can be used without distinction from the organic solvent type adhesive. In this dry lamination method, after applying the adhesive to the surface of the adherend, the solvent (water or organic solvent) necessary for maintaining the adhesive in a fluid state is dried and removed before the bonding work. It is a method of pressure bonding or thermocompression bonding.

[0004]

The performance required for the water-based adhesive for polyolefin resin materials, particularly when the dry lamination method is adopted, can be summarized as follows.

1) The adhesive dried on the surface of the adherend has wettability with respect to the polyolefin resin material as the adherend and a constant initial adhesive force. (The initial adhesive strength may be adhesive strength.) 2) The initial adhesive strength and wettability should be maintained for a certain period of time after drying at a certain temperature. 3) The initial adhesive strength should change to an adhesive strength with excellent heat resistance within 48 hours.

However, the water-based adhesive for polyolefin resin materials comprising the above-mentioned anionic water-based polyurethane emulsion having a polyolefin-based polyol as the main chain is excellent in affinity with the polyolefin resin materials, but the above-mentioned 1) to The performance of 3) is not always satisfactory.

Therefore, the present invention has been made for the purpose of providing a water-based adhesive for polyolefin resin materials suitable for the dry lamination method, which satisfies all of the above 1) to 3).

[0008]

[Means for Solving the Problems] That is, the present invention relates to an aqueous adhesive containing an anionic aqueous polyurethane emulsion having a polyolefin-based polyol as a main skeleton as a main component, which is a primary or secondary polyvalent amine and a salt thereof. One or two or more selected from 0.1 to 0.1% by weight of the adhesive.
A polyolefin containing 5.0% by weight, and 1 to 50% by weight of the adhesive, of one or more selected from water-soluble high-boiling point organic solvents capable of dissolving or swelling the aqueous polyurethane. A water-based adhesive for resin materials.

The anionic aqueous polyolefin-based polyurethane used as the main component of the aqueous adhesive of the present invention is obtained by reacting a polyolefin-based polyol with a polyisocyanate.

Examples of the polyolefin-based polyol, that is, the polyol whose main chain is a polyolefin-based polyol include 1,2-polybutadiene polyol, 1,4-polybutadiene polyol, 1,2-polychloroprene polyol and 1,4-polychloroprene polyol. Examples thereof include polybutadiene-based polyols, chain-like polyethylene polyols obtained by saturating the double bond of these polybutadiene-based polyols with hydrogen or halogen, chlorinated polyethylene polyols, and branched saturated hydrocarbon-based polyols. Furthermore, a polyol obtained by copolymerizing a polybutadiene-based polyol with an olefin compound such as styrene, ethylene, vinyl acetate, or an acrylic ester, or a hydrogenated polyol thereof can be used. Particularly preferred polyolefin-based polyol is a hydrocarbon-based polyol having a high degree of saturation and having an average molecular weight of 500 to 4000,
The average functionality of the hydroxyl groups is 1.5 to 3.

Examples of the polyisocyanate that can be reacted with the polyolefin-based polyol include conventionally known polyisocyanate compounds such as tolylene diisocyanate, diphenylmethane diisocyanate, naphthylene diisocyanate, 1,6-hexamethylene diisocyanate, xylylene diisocyanate and isophorone diisocyanate. Can be used.

In producing an aqueous polyurethane emulsion, a polyolefin-based polyol and a polyisocyanate are reacted in the presence or absence of a solvent to form a polyurethane prepolymer, and the polyurethane prepolymer is then treated with a surfactant. A conventionally known method for producing a polyurethane resin such as a method of mechanically dispersing in water or a method of reacting with an active hydrogen compound having an anionic or cationic salt-forming group to make it aqueous is applicable.

The primary or secondary polyvalent amine and its salt are added as a component for promoting the curing of the aqueous polyolefin polyurethane emulsion which is the main component, and this action chemically shifts from tackiness to adhesion. Can be made Examples of such amines include hydrazine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, isophoronediamine, piperazine, polyoxypropyleneamines, and further neutralization of these amines with various acids. Salts obtained by the reaction are included. In the present invention, one or more of these polyvalent amines and salts thereof are selected and compounded in the adhesive in an amount of 0.1 to 5.0% by weight based on the weight of the adhesive. The polyvalent amine reacts with an anion group which becomes a hydrophilic group introduced into the polymer, and its addition amount is preferably equivalent to that of the anion group. However, in various anionic emulsions, the amount required for emulsification and dispersion is different. In general, an excess of hydrophilic groups impairs the water resistance of the polymer, so 0.1 to 0.1% in the polymer.
Anionic groups are introduced in the range of 5.0% by weight. Therefore, the desired effect cannot be obtained when the polyvalent amine is added in an amount of 0.1% by weight or less, and when the amount of the polyvalent amine is excessively used, workability is deteriorated due to amine odor and the like.

The water-soluble high-boiling-point organic solvent capable of dissolving or swelling the aqueous polyurethane is used as a component for improving the wettability with respect to the adherend polyolefin resin material and maintaining its performance. As such an organic solvent, for example, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dimethylformamide, N-methyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone and the like can be preferably used.
In the present invention, one kind or two or more kinds are selected from these organic solvents, and 1 to 50% by weight of the weight of the adhesive is selected.
It is compounded in the adhesive within the range. From the viewpoint of wettability, the effect of addition is recognized even with a small amount, but the effect is not maintained. The proper amount of use at the practical level is 3 to 2
0% by weight is preferable, and if it exceeds 50% by weight, the form of the emulsion changes from the dispersed form to the melted form, and the workability is significantly deteriorated (the drying speed is lowered and the solvent smell is generated).

When the polyolefin resin material and other materials are bonded together, it is preferable to appropriately mix an aqueous plastic emulsion having good adhesiveness with the other material into the above water-based adhesive for polyolefin resin material. The blending amount is preferably in the range of 1 to 85% by weight based on the total weight of the adhesive, and the aqueous plastic emulsion to be blended may be blended not only in one kind but also in appropriate combination of two or more kinds.

Examples of other materials to be adhered to the polyolefin resin material and kinds of water-based plastic emulsion suitable for the materials are as follows.

Other materials are fibrous fiber materials (cotton, paper,
In case of wood etc .; polyether type polyurethane emulsion, polyvinyl acetate emulsion, polyacrylic ester emulsion, when other materials are polyester resin materials: polyester type polyurethane emulsion, polycarbonate type polyurethane emulsion, ethylene-vinyl acetate copolymer Emulsion, when other material is polyvinyl chloride resin material; polyester polyurethane emulsion, ethylene / vinyl acetate copolymer emulsion, when other material is polyacrylonitrile resin material or its modified material; polyacrylic ester emulsion, other When the material is polystyrene resin material or its modified material; polyether polyurethane emulsion,
Styrene / butadiene copolymer emulsion.

[0018]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. In addition, (A), (B), (C) and (D) described before each compounding component in the examples and comparative examples indicate the types of the following compounds.

(A): Anionic aqueous polyurethane emulsion having a polyolefin-based polyol as a main skeleton, (B): primary or secondary polyvalent amine and its salt, (C): water-soluble high-boiling organic solvent, (D) : An aqueous plastic emulsion having adhesiveness to other adherends other than polyolefin resin materials. Further, "parts" in Examples and Comparative Examples represent parts by weight.

Example 1 Adhesive for Adhesion of Polypropylene and ABS Resin (A) "Izelax S-8020" (Note 1) 65 parts (B) Hexamethylenediamine 0.5 part (C) Dimethylformamide 10 parts ( C) N-methyl-2-pyrrolidone 10 parts (D) "Neocryl A-5144" (Note 2) 13.5 parts "SN thickener A-812" (Note 3) 1 part

(Note 1) A trade name of an aqueous polyolefin-based polyurethane emulsion manufactured by Hodogaya Chemical Co., Ltd. Hydrogenated polybutadiene polyol (average molecular weight 220
40% aqueous dispersion of polyurethane polyurea resin having an average molecular weight of about 90,000 consisting of 0) and tolylene diisocyanate.
(Note 2) A trade name of an aqueous polyacrylic ester emulsion manufactured by ICI. Heat seal temperature 120 ° C, resin concentration 37%. (Note 3) Product name of thickener manufactured by San Nopco.

The adhesive of the present invention having the above-mentioned composition was applied to a commercially available ABS.
100-12 by wet weight using air spray on the surface of resin panel (100 mm in length, 25 mm in width, 2 mm in thickness)
Apply evenly to a coating amount of 0 g / m ² , 60 ° C
After being dried for 3 minutes at 110 ° C., polypropylene foam (H side of Toray Pef PPX (trade name of Toray Industries, Inc.)) that has been softened by heating at 110 ° C. in advance is attached to the adhesive application surface, and 300 to 500 g / An adhesion test piece was obtained by pressing for 10 seconds under a load of cm ² .

In this case, the active heat energy for adhesion is given by the heating of polypropylene foam and the heat-drying of the ABS resin coated with the adhesive, and is generated together with the length of the elapsed time (open time) from thermal activation to bonding. The loss of active heat energy (decrease in temperature of the adhesive interface at the time of bonding) causes deterioration of wettability of the adhesive with the polypropylene foam, resulting in poor adhesion. In other words, the open time is the time that is governed by the production line speed, and the longer the length of the line, the better the line compatibility becomes when the various line speeds are assumed. On the contrary, the expression speed of the adhesive force is slowed down. Therefore, standing on these balances, longer open time is desired. Therefore, for the above-mentioned adhesion test piece obtained in this example,
Following the change in open time, the initial room temperature adhesive strength and 4
After 8 hours, 90 ° C. hot adhesion was tested. The results are shown in Table 1. In the peeling strength test, the adhesive strength is PP
Causes destruction of X material.

Comparative Example 1 (A) "Izelax S-8020" 85 parts (D) "Neocryl A-5144" 14 parts "SN Thickener A-812" 1 part Using the adhesive having the above composition, Example 1 An adhesion test piece was prepared in the same manner and its adhesion was tested. The results are also shown in Table 1.

Comparative Example 2 (A) "Izelax S-8020" 85 parts (B) Hexamethylenediamine 0.5 part (D) "Neocryl A-5144" 13.5 parts "SN Thickener A-812" 1 part An adhesive test piece was prepared in the same manner as in Example 1 using the adhesive having the above composition, and its adhesive force was tested. The results are also shown in Table 1.

Table 1 Initial room temperature adhesive strength After 48 hours 90 ° C Hot adhesive strength Open Peel strength 300g Creep peel strength 200g Creep time 50 mm / min 2 hours gap 50 mm / min 2 hours gap Example 1 3 minutes PPX material Break 0 mm PPX material break 0 mm 5 minutes PPX material break 0 mm PPX material break 0 mm 10 minutes PPX material break 3 mm PPX material break 0 mm Comparative example 1 3 minutes 0.9kgf / in 35 minutes Drop 0.6kgf / in 24 minutes Falling ABS interface ABS interface Cohesive failure Cohesive failure 5 minutes Adhesive failure Adhesive failure Adhesive failure Adhesive failure Comparative Example 2 3 minutes PPX material failure 5 mm PPX material failure 0 mm 5 minutes Adhesion failure Adhesion failure Adhesion failure Adhesion failure

Note) Creep test: In a constant temperature atmosphere, a constant static load is applied to a 1-inch wide test piece in a 90 ° peeling direction, and the number of distances (deviation) in which peeling occurs in a unit time is expressed in millimeters. .. In other words, room temperature creep means a static load of 300g in an atmosphere of 25 ° C and a hot creep of 9g.
Under a 0 ° C. atmosphere, a static load of 200 g was applied to the 90 ° peeling direction (T-shaped peeling direction), and the peeling distance number after 2 hours was displayed. Note: Peeling test: The peeling test was performed according to JIS K 6829 1984, item 12.

As can be seen from Table 1, the adhesive of the present invention can obtain an initial room temperature adhesive force and a hot adhesive force after 48 hours which are substantially the same as when the open time is 10 minutes. On the other hand, with the adhesive of Comparative Example 1, a satisfactory adhesive force could not be obtained even after an open time of 3 minutes, resulting in poor adhesion at an open time of 5 minutes. Furthermore, the adhesive of Comparative Example 2 has a satisfactory adhesive strength when the open time is 3 minutes, but causes poor adhesion when the open time is 5 minutes.

Example 2 Adhesive for Adhesion of Polypropylene and Soft Vinyl Chloride Resin (A) "Izelax S-8020" 34 parts (B) Tetraethylene pentamine carbonate 0.5 part (C) 1,3- Dimethyl-2-imidazolidinone 13.5 parts (D) "Izelax S-4040N" (Note 4) 51 parts "SN thickener A-812" 1 part

(Note 4) Trade name of polyester polyurethane emulsion manufactured by Hodogaya Chemical Co., Ltd. An average molecular weight of about 7 consisting of polybutylene adipate polyol (average molecular weight 2000) and hexamethylene diisocyanate
A 45% water dispersion of 10,000 polyurethane polyurea resins.

The adhesive of the present invention having the above composition was applied to one side of a commercially available soft vinyl chloride resin or polypropylene foam (Toray Pef PPX) with a wet weight of 150.
Apply evenly to obtain a coating amount of g / m ^{2 and}
After drying at 5 ° C. for 5 minutes, the adhesive coated surface was heated to 130 ° C. immediately before bonding (thermal activation step), and then bonded and bonded by roll pressure bonding to obtain an adhesive test piece.

With respect to the obtained adhesive test piece, the initial room temperature adhesive force and the 90 ° C. hot adhesive force after 48 hours were measured in the same manner as in Example 1 by following changes in open time (elapsed time between the heat activation step and the laminating step). Tested. The results are shown in Table 2.

Comparative Example 3 (A) "Izelax S-8020" 40 parts (D) "Izelax S-4040N" 59 parts "SN Thickener A-812" 1 part Using the adhesive having the above composition, Example 2 Adhesion test pieces were prepared in the same manner as above, and their adhesive strength was tested. The results are also shown in Table 2.

Comparative Example 4 (A) "Izelax S-8020" 40 parts (B) Tetraethylenepentamine carbonate 0.5 part (D) "Iselax S-4040N" 58.5 parts "SN Thickener A- 812 "1 part An adhesive test piece was prepared in the same manner as in Example 2 using the adhesive having the above composition, and the adhesive force was tested. The results are also shown in Table 2.

Table 2 Initial room temperature adhesive strength After 48 hours 90 ° C Hot adhesive strength Open Peel strength 300g Creep peel strength 200g Creep time 50 mm / min 2 hours gap 50 mm / min 2 hours gap Example 2 15 seconds PPX material Break 0 mm PPX material break 0 mm 30 seconds PPX material break 0 mm PPX material break 0 mm 60 seconds PPX material break 0 mm PPX material break 0 mm Comparative example 3 15 seconds 1.4 kgf / in 45 mm 0.8 kgf / in 30 minutes drop Cohesive failure Cohesive failure Cohesive failure Cohesive failure 30 seconds Adhesive failure Adhesive failure Adhesive failure Adhesive failure Comparative Example 4 15 seconds PPX material failure 0 mm PPX material failure 0 mm 30 seconds Adhesion failure Adhesion failure Adhesion failure Adhesion failure

As can be seen from Table 2, even when the open time is 60 seconds, the adhesive of the present invention can achieve satisfactory initial room temperature adhesive strength and hot adhesive strength after 48 hours as in the case of 15 seconds. On the other hand, with the adhesive of Comparative Example 3, a satisfactory adhesive force could not be obtained even when the open time was 15 seconds, and the adhesive failure occurred when the open time was 30 seconds. Comparative Example 4
The adhesive of No. 1 has a satisfactory adhesive strength when the open time is 15 seconds, but the adhesive failure occurs when the open time is 30 seconds.

Example 3 : Adhesive for Adhesion of Polypropylene and Paper (A) "Izelux S-8040N" (Note 5) 32 parts (B) Polyoxypropylene amine (Mn 3000) 1 part (C) Diethylene glycol dimethyl ether 13 parts (C) N-methyl-2-pyrrolidone 5 parts (D) "Neocryl A-5102" (Note 6) 48 parts "Aizerax LV-30" (Note 7) 1 part

(Note 5) Trade name of an aqueous polyolefin polyurethane emulsion manufactured by Hodogaya Chemical Co., Ltd. A 50% aqueous dispersion of polyurethane polyurea resin consisting of hydrogenated polybutadiene polyol / polyhexamethylene adipate mixed polyol and isophorone diisocyanate. (Note 6) A polyacrylic ester emulsion with a heat sealing temperature of 60 ° C. manufactured by ICI. (Note 7) Thickener manufactured by Hodogaya Chemical Co., Ltd.

The adhesive having the above composition was uniformly applied to a polypropylene film so as to have a coating amount of 25 g / m ² by wet weight, dried at 80 ° C. for 3 minutes, and then laminated with processed paper and heated at 70 ° C. Adhesion was performed by pressing with a roll to obtain an adhesion test piece.

This adhesion processing is commonly called print lamination, and is intended for the purpose of protecting printed paper and aesthetics. In this adhesion processing, it is needless to say that the adhesive strength between the polypropylene film and the processed paper is required, but a gloss finish similar to that of a coated product that does not reduce the contrast of printing is required. In particular, deterioration of the wettability of the adhesive with respect to the adherend is an important evaluation criterion because it impairs the finish with a transparent depth feeling. Therefore, the adhesive strength and finish of the above-mentioned adhesive test pieces obtained in this example were evaluated. The results are shown in Table 3. The expression of the adhesive force causes destruction of the processed paper.

Comparative Example 5 (A) "Izelax S-8040N" 40 parts (D) Polyacrylic ester emulsion 59 parts "Iselax LV-30" 1 part The same as Example 3 using the above-mentioned adhesive. Then, an adhesion test piece was prepared and its adhesion and finish were evaluated. The results are also shown in Table 3.

Comparative Example 6 (A) "Izelax S-8040N" 40 parts (B) Polyoxypropyleneamine (Mn3000) 1 part (D) Polyacrylic ester emulsion 59 parts "Iselax LV-30" 1 part Above An adhesive test piece was prepared in the same manner as in Example 3 using the adhesive having the composition, and its adhesive force and finish were evaluated. The results are also shown in Table 3.

[0043] Table 3 adhesion (peel rate 50 mm / min) finish properties Example 3 fracture processed paper material good Comparative Example 5 1.2 kgf / in cohesive failure broken good Comparative Example 6 processed paper material wettability poor

As can be seen from Table 3, when the adhesive of the present invention was used for print lamination, satisfactory evaluations were obtained for both adhesive strength and finish. On the other hand, the adhesive of Comparative Example 5 was not satisfactory in adhesive strength, and the adhesive of Comparative Example 6 was not satisfactory in finish.

Example 4 Adhesive for Adhesion of Polypropylene and Parchyl Board (A) "Izelux S-8020" 32 parts (B) Isophoronediamine 1 part (B) Hexamethylenediamine 1 part (C) 1,3-Dimethyl -2-Imidazolidinone 10 parts (C) N-methyl-2-pyrrolidone 5 parts (D) "Izelax S-1040" (Note 8) 48 parts "SN Thickener A-812" 3 parts (Note 8) Product name of polyether polyurethane emulsion manufactured by Tsuchiya Chemical Industry Co., Ltd. A 53% aqueous dispersion of a polyurethane polyurea resin having an average molecular weight of about 80,000 consisting of polypropylene ether glycol (average molecular weight 1750) and tolylene diisocyanate.

The adhesive having the above composition was applied to polypropylene foam (Toray Pef PPX) in a wet amount of 150 g / m.
^A uniform coating amount of ² was applied, followed by drying at 80 ° C for 5 minutes, then bonding with a particle board preheated to 130 ° C, and pressing for 20 seconds with a load of 500 g / cm ² to bond, and an adhesion test piece Got

In this adhesion processing, the phenomenon of deterioration in wettability is observed as the surface temperature of the particle board decreases, and adhesion failure tends to occur. Therefore, in order to examine how much the adhesive strength of the above-mentioned adhesion test pieces obtained in this example decreases as the particle board surface temperature decreases to 125 ° C., 100 ° C. and 75 ° C. The peel strength after a lapse of time was evaluated. The results are shown in Table 4. The development of the adhesive force causes the PPX material to break.

Comparative Example 7 (A) "Izelux S-8020" 39 parts (D) "Izelux S-1040" 59 parts "SN Thickener A-812" 1 part Using the adhesive having the above composition, Example 4 Adhesion test pieces were prepared in the same manner as above, and the peel strength after 4 hours was evaluated. The results are also shown in Table 4.

Comparative Example 8 (A) "Izelax S-8020" 38 parts (B) Isophoronediamine 1 part (B) Hexamethylenediamine 1 part (D) "Izelax S-1040" 58 parts "SN Thickener A- 812 ″ 2 parts An adhesive test piece was prepared in the same manner as in Example 4 using the adhesive having the above composition, and the peel strength after 4 hours was evaluated. The results are also shown in Table 4.

Table 4 125 ° C. 100 ° C. 75 ° C. Example 4 PPX material break PPX material break PPX material break Comparative example 7 1.2 kgf / cm ² Adhesive failure Adhesive failure Comparative example 8 PPX material failure Adhesive failure Adhesive failure

As can be seen from Table 4, in the case of the adhesive test piece using the adhesive of the present invention, even if the surface temperature of the particle board is lowered to 125 ° C., 100 ° C. and 75 ° C., the adhesive strength is not lowered. It was On the other hand, the adhesives of Comparative Examples 7 and 8 have a particle board surface temperature of 100.
When the temperature was lowered to below 0 ° C, poor adhesion was exhibited.

Example 5 : Adhesive for adhering polypropylene films to each other (A) "Izelax S-8020" 91.5 parts (B) Hexamethylenediamine carbamate 0.5 parts (C) N-methyl-2-pyrrolidone 8.0 parts The adhesive having the above composition was adhered to an OPP film having a thickness of 0.025 mm so as to be 10 to 25 g / m ² by using a transfer roll, and dried in a hot air circulation oven at 80 ° C. for about 1 minute. After that, on the heat plate heated to 80 ° C., 0.8 kg / c of the OPP film without the adhesive is attached.
A pressure of m ² was applied for 10 seconds. The adhesive strength was evaluated by curing the adhesive in a constant temperature and humidity chamber at a temperature of 25 ° C and a humidity of 60% for 24 hours after the adhesion, and then performing a peel test (temperature 25 ° C, peeling speed 50 mm
/ Min). The results are shown in Table 5.

Comparative Example 9 (A) "Izelax S-8020" 99.5 parts (B) Hexamethylenediamine carbamate 0.5 part Using the adhesive having the above composition, the adhesive strength was evaluated in the same manner as in Example 5. did. The results are also shown in Table 5.

Comparative Example 10 (A) "Izelax S-8020" 92.0 parts (C) N-methyl-2-pyrrolidone 8.0 parts Adhesion was carried out in the same manner as in Example 5 using the adhesive having the above composition. Evaluated for power. The results are also shown in Table 5.

Table 5 Example 5 Comparative Example 9 Comparative Example 10 Peel strength 3.88 2.45 1.42 kgf / inch Cohesive failure of adhesive layer Cohesive failure of adhesive layer due to insufficient wettability (PP under load stress) Partial PP interface peeling (thread-like peeling) with shape change

As can be seen from Table 5, it is possible to bond the polyolefin materials to each other at a low temperature around 80 ° C. by the adhesive of the present invention. Even if one of the composition components is missing as in Comparative Examples 9 and 10, the desired adhesive performance cannot be obtained.

[0057]

As is apparent from the above description,
Water-based adhesive for polyolefin resin material of the present invention, various performances required when adopting the dry lamination method,
That is, the adhesive dried on the surface of the adherend has a wettability with respect to the adherend and a constant initial adhesive strength, and these initial adhesive strength and wettability are maintained for a fixed time at a constant temperature after drying. That is, the initial adhesive force is changed to an adhesive force excellent in heat resistance within 48 hours, and all the various properties can be satisfied.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location C09J 175/04 JFG 8620-4J JFH 8620-4J

Claims (2)

[Claims] 1. A water-based adhesive containing, as a main component, an anionic water-based polyurethane emulsion having a polyolefin-based polyol as a main skeleton, which comprises one or more selected from primary or secondary polyvalent amines and salts thereof. 1 to 50% by weight of the adhesive, and 0.1 to 5.0% by weight of the adhesive, and 1 or 2 or more selected from water-soluble high-boiling organic solvents capable of dissolving or swelling the aqueous polyurethane.
A water-based adhesive for a polyolefin resin material, which is characterized by containing it by weight%. 2. A water-based adhesive for adhering a polyolefin resin material and other materials, wherein the water-based adhesive according to claim 1 is one or more selected from the following water-based plastic emulsions. The adhesive weight of 1-8
Aqueous adhesive for polyolefin resin material characterized by containing 5% by weight: polyether polyurethane emulsion, polyester polyurethane emulsion, polycarbonate polyurethane emulsion, polyacrylic ester emulsion, ethylene / vinyl acetate copolymer emulsion, Styrene / butadiene copolymer emulsion, polyvinyl acetate emulsion.