JP2003336021A - Tackifier resin emulsion and aqueous adhesive composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tackifier resin emulsion excellent in emulsifying properties of the emulsion and storage stability, and an aqueous adhesive composition excellent particularly in initial adhesive properties and applicability not to speak of self-adhesive characteristics under ordinary conditions. <P>SOLUTION: The tackifier resin emulsion comprises a tackifier resin, an emulsifier and water, where a tackifier resin composition having an acid value of 90-220 and a softening point of 80-160°C is employed as the tackifier resin. The aqueous adhesive composition comprises at least one base polymer selected from the group consisting of an acrylic polymer emulsion, a rubber-based latex and a synthetic resin-based emulsion, and the tackifier resin emulsion. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a tackifying resin emulsion and a water-based adhesive composition. For more information,
A tackifying resin emulsion capable of improving the emulsifying property of an emulsion, storage stability and adhesive properties under normal conditions, and a water-based adhesive composition using the tackifying resin emulsion, which is particularly excellent in initial adhesiveness and coatability. Regarding

[0002]

2. Description of the Related Art Adhesives are used in a wide range of fields such as packaging, construction, and building materials. Generally, a base polymer such as an acrylic polymer is tackified in order to impart tackiness and other adhesive properties. Resin has been added. Conventionally, solvent-based adhesives have been widely used, but in recent years, water-based emulsion adhesives that have various advantages such as no air pollution, excellent safety and hygiene, and suitable for resource saving. It is being converted.

Conventionally, as a water-based adhesive, an acrylic polymer emulsion, a styrene-butadiene copolymer latex, a natural rubber latex, a chloroprene latex and the like have been used as a base polymer, on which rosins, rosin derivatives, petroleum resins and terpenes are added. A water-based adhesive composition containing a tackifying resin emulsion such as a base resin, a phenol resin, or a ketone resin is known. Usually, emulsions of rosin-based resins such as rosins and rosin derivatives are widely used for such tackifying resin emulsions because they have good compatibility with the base polymer and good adhesive properties.

However, even when these emulsions of rosin-based resins are used, the initial adhesiveness and coatability required for water-based adhesives are insufficient, and water-based adhesives that can improve these properties are required. ing.

[0005]

DISCLOSURE OF THE INVENTION The present invention is not only excellent in the emulsifying property of an emulsion and the storage stability but also in the tackifying resin emulsion under ordinary conditions, and particularly in the initial adhesiveness and the coating property. It is an object to provide a water-based adhesive composition having excellent workability.

[0006]

Means for Solving the Problems The inventors of the present invention have made earnest studies from the viewpoint of the composition of the tackifying resin in order to solve the above-mentioned problems of the prior art. As a result, the tackifying resin has a specific acid value and a softening property. By using a tackifying resin emulsion using a tackifying resin composition having points, a water-based adhesive composition having excellent initial adhesiveness and coatability can be obtained, and particularly, an unsaturated acid-modified rosin is contained. It has been found that the use of a tackifying resin emulsion containing the tackifying resin composition can improve the initial adhesiveness and coatability. The present invention has been completed based on this new finding.

That is, the present invention provides a tackifying resin emulsion consisting of a tackifying resin, an emulsifier and water, which is a tackifying resin composition having an acid value of 90 to 220 and a softening point of 80 to 160 ° C. A tackifying resin emulsion characterized by being used; comprising at least one base polymer selected from the group consisting of an acrylic polymer emulsion, a rubber latex and a synthetic resin emulsion, and the tackifying resin emulsion. And a water-based adhesive composition.

The tackifying resin composition used in the present invention has an acid value of 90 to 220 and a softening point of 80 to 160.
There is no particular limitation as long as it is at a temperature of ° C, and known materials can be used. If the acid value is less than 90, the coatability and adhesive properties will deteriorate, and if it exceeds 220,
It is not preferable because the stability at the time of emulsification is lowered and the adhesive property is lowered. If the softening point is below 80 ° C,
If the adhesive property is lowered and exceeds 160 ° C., the stability at the time of emulsification is lowered and the adhesive property is lowered, which is not preferable. The acid value of the tackifying resin composition is 100 to 13
It is preferable that the softening point is 0 and the softening point is 90 to 130 because the adhesive property and the emulsifying property are further improved. As the tackifying resin composition, various known tackifying resins such as rosin-based resins, petroleum-based resins, terpene-based resins, phenol resins, and ketone resins can be used alone or as a mixture of several kinds.

Examples of rosin-based resins include raw rosins such as gum rosin, wood rosin and tall oil rosin; disproportionated raw rosins; stabilized rosins obtained by hydrogenating raw rosins; rosins such as polymerized rosins and rosins. Various known compounds such as esterified products, phenol modified products and unsaturated acid modified rosins can be used without particular limitation. The esterified product of rosin refers to an esterified product of the rosin and polyhydric alcohol. Examples of polyhydric alcohols include dihydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol and neopentyl glycol; trihydric alcohols such as glycerin, trimethylolethane and trimethylolpropane;
Examples thereof include tetrahydric alcohols such as pentaerythritol and diglycerin; and hexahydric alcohols such as dipentaerythritol. These polyhydric alcohols can be used alone or in combination of several kinds. Phenol-modified products of rosins are those prepared by adding phenols such as phenol and alkylphenol to the above-mentioned rosins, or ester using polyhydric alcohols after adding phenols to rosins. Examples thereof include so-called rosins, so-called rosin-modified phenol resins obtained by reacting rosins with a resol-type phenol resin, and esterified products thereof. As the unsaturated acid-modified rosins, maleic acid, fumaric acid, (meth) acrylic acid (note that the raw material rosin is
“(Meth) acrylic” means “acrylic” or “methacrylic”. The same shall apply hereinafter) and the like, and unsaturated acid-modified rosin modified with an unsaturated acid, its esterified product, etc. may be used alone or in admixture of two or more. The esterified product of unsaturated acid-modified rosin is an esterified product of the unsaturated acid-modified rosin and the polyhydric alcohol.

As the petroleum resin, C5 petroleum resin, C
9-based petroleum resin, C5-C9 copolymer-based petroleum resin, pure monomer resin obtained by polymerizing one or several kinds of monomers obtained by purifying petroleum fractions, dicyclopentadiene-based petroleum resin, and these And the like.

As the terpene resin, an α-pinene resin, a β-pinene resin, or an aromatic-modified terpene resin obtained by copolymerizing terpenes such as α-pinene and β-pinene with an aromatic monomer such as styrene. And hydrides thereof can be exemplified.

The phenol resin generally refers to a condensate of phenol and formaldehyde, and examples of the phenol include phenol, m-cresol, 3,5-xylenol, p-alkylphenol, resorcin, and the like. Examples thereof include resole obtained by addition reaction of alkanol with an alkali catalyst, and novolac obtained by condensation reaction with an acid catalyst. Further, a rosin phenol resin obtained by adding phenol to rosin with an acid catalyst and thermally polymerizing the same can be exemplified.

The ketone resin means methyl ethyl ketone, methyl isobutyl ketone, acetophenone, cyclohexanone, or a condensation product of methylcyclohexanone and formaldehyde.

As the tackifying resin composition having an acid value of 90 to 220 and a softening point of 80 to 160 ° C., unsaturated acid-modified rosins are preferable, and particularly unsaturated acid-modified rosins and other adhesives. When a mixture of applied resins is used,
It is preferable because the initial adhesiveness and coatability are remarkably improved.
At this time, the tackifying resin used in combination with the unsaturated acid-modified rosin is not particularly limited, but it is preferable to use a rosin-based resin from the viewpoint of initial adhesiveness and tackiness.
The unsaturated acid-modified rosin content in this case is usually 70% or less, preferably 60% or less, and more preferably 50% or less. If the content exceeds 70%, the stability at the time of emulsification tends to decrease and the adhesive property tends to decrease, which is not suitable.

As the emulsifier used in the present invention, various known anionic emulsifiers and nonionic emulsifiers having a weight average molecular weight of 100,000 or less, preferably 50,000 or less are used alone or in combination of several kinds without particular limitation. it can. By setting the weight average molecular weight to 100,000 or less, reduction of emulsifying ability is prevented,
It is preferable because the product viscosity does not become too high. Examples include α-olefin sulfonates, alkyl sulfates,
Alkyl phenyl sulphate, polyoxyethylene alkyl phenyl ether sulphate, polyoxyethylene aralkyl phenyl ether half ester salt of sulfosuccinic acid, alkyl sarcosinate, anionic emulsifiers such as rosin soap and nonionic emulsifiers such as polyoxyethylene alkyl ether And one of these
The seeds may be used alone or in combination of two or more. The amount of emulsifier used is usually 100 parts by weight of tackifying resin,
It is about 1 to 10 parts by weight, preferably 1 to 5 parts by weight in terms of solid content. When the amount of the emulsifier used is less than 1 part by weight, emulsification becomes difficult, and when it is more than 10 parts by weight, water resistance and adhesive performance tend to be deteriorated, which is not preferable.

The emulsification method of the tackifying resin is not particularly limited, and any known emulsification method such as a high pressure emulsification method, an inversion emulsification method, an ultrasonic emulsification method and a solvent emulsification method may be adopted. The reverse emulsification method may be adopted for applications where complete solvent-free is required. In the case of the inversion emulsification method, the above tackifying resin composition is melted at a softening point or higher, an emulsifier is kneaded into this, and then water is added to cause phase inversion to obtain an emulsion.

The solid content concentration of the tackifying resin emulsion thus obtained is not particularly limited, but is usually 20 to 70.
It is used by appropriately adjusting it so as to be about% by weight. Also,
The average particle size of the obtained emulsion is usually 0.1 to 2
It is about μm, and most of them are uniformly dispersed as particles of 0.5 μm or less. The emulsion has a white or milky white appearance, a pH value of about 2 to 9 and a viscosity of about 10 to 500 mPa · s.

The water-based adhesive / adhesive composition of the present invention comprises the tackifying resin emulsion blended with at least one base polymer selected from the group consisting of an acrylic polymer emulsion, a rubber latex and a synthetic resin emulsion. It will be.

The acrylic polymer emulsion used together with the tackifying resin emulsion is not particularly limited, and various kinds can be used. The acrylic polymer emulsion can be easily produced by a known emulsion polymerization method such as batch-charging method of (meth) acrylic acid ester polymerization method, monomer sequential addition polymerization method, emulsion monomer sequential addition polymerization method, and seed polymerization method. it can.

Examples of the (meth) acrylic acid ester used include methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate,
Examples thereof include 2-ethylhexyl (meth) acrylate, glycidyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate. These may be used alone or in admixture of two or more. Further, in order to impart storage stability to the obtained acrylic polymer emulsion, a small amount of (meth) acrylic acid may be used instead of the (meth) acrylic acid ester. Further, if desired, a copolymerizable monomer such as vinyl acetate or styrene can be used in combination to the extent that the adhesive property of the (meth) acrylic acid ester polymer is not impaired. As the emulsifier used in the acrylic polymer emulsion, various known emulsifiers such as anionic emulsifiers, nonionic emulsifiers and partially saponified polyvinyl alcohol can be used, and the amount thereof is 0 based on 100 parts by weight of the polymer. 0.1 to 5 parts by weight, preferably 0.5 to 3 parts by weight.

The ratio of the acrylic polymer emulsion to the tackifying resin emulsion used is usually about 10 to 100 parts by weight (solid content) with respect to 100 parts by weight (solid content) of the acrylic polymer emulsion. (Converted) is preferable. If the tackifying resin emulsion is less than 10 parts by weight, the modification due to addition of the tackifying resin may hardly be observed, and if it exceeds 100 parts by weight, the cohesive force tends to decrease. is there.

As the rubber-based latex, various known ones used in water-based adhesive / adhesive compositions can be used. Examples thereof include natural rubber latex, styrene-butadiene copolymer latex, and chloroprene latex.

The use ratio of the rubber-based latex and the tackifying resin emulsion is usually about 10 to 150 parts by weight (solid content) with respect to 100 parts by weight of rubber latex (solid content). Is preferred. If the tackifying resin emulsion is less than 10 parts by weight, the modification due to addition of the tackifying resin may be hardly observed, and if it exceeds 150 parts by weight, the cohesive force tends to decrease. .

As the synthetic resin emulsion, various known ones used in water-based adhesive compositions can be used, for example, vinyl acetate emulsion and ethylene-based emulsion.
Examples thereof include synthetic resin emulsions such as vinyl acetate copolymer emulsions and urethane emulsions.

The ratio of the synthetic resin emulsion and the tackifying resin emulsion used is as follows.
It is preferable that the addition amount of the tackifying resin emulsion is about 10 to 100 parts by weight (solid content conversion) with respect to 0 part by weight (solid content conversion). If the tackifying resin emulsion is less than 10 parts by weight, the modification due to the addition of the tackifying resin may hardly be recognized, and if it exceeds 100 parts by weight, the cohesive force tends to decrease. is there.

The water-based adhesive composition of the present invention comprises at least one base polymer selected from the group consisting of an acrylic polymer emulsion, a rubber latex and a synthetic resin emulsion and a tackifying resin emulsion as essential components. However, in addition to these, if necessary, antifoaming agent, thickener, filler, antioxidant, water resistance agent,
A film-forming aid, a water retention agent, etc. can be added.

[0027]

EFFECTS OF THE INVENTION The tackifying resin emulsion obtained by the present invention is characterized by good storage stability and excellent workability. Further, the obtained water-based adhesive composition has the characteristics due to the tackifying resin emulsion and has excellent initial adhesiveness and coatability.

[0028]

EXAMPLES The present invention will be described in detail below with reference to production examples, examples and comparative examples, but the present invention is not limited to these examples. In each example, parts and% are based on weight.

Production Example 1 (Production Example of Acrylic Polymer Emulsion) A four-necked flask equipped with a stirrer, a reflux condenser, a dropping funnel and a nitrogen inlet tube was placed under a nitrogen gas stream at 70 ° C.
43 parts of water and 0.9 part of disodium polyoxyethylene alkyl sulfosuccinate as the anionic emulsifier (the alkyl has 12 to 14 carbon atoms and the degree of polymerization of ethylene oxide is 7) were dissolved. Also, (1) styrene 20
Part, 2-ethylhexyl acrylate 25 parts and acrylic acid 2 parts, and (2) catalyst (potassium persulfate) 0.2
Parts, pH adjusting agent (baking soda) 0.1 parts and water 8.8 parts,
From each separate dropping funnel, 1/10 amount was added dropwise, and a preliminary reaction was performed at 70 ° C. under a nitrogen gas stream for 30 minutes, and then 9/10 amounts of (1) and (2) were taken over 2 hours. Dropwise polymerization was performed. After the addition of all the amounts of (1) and (2) was completed, the reaction was completed at 70 ° C. for 1 hour, cooled to room temperature, and then taken out through 100 mesh wire mesh filtration to obtain an acrylic-based polymer with a solid content of 48.2%. A combined emulsion was obtained.

Example 1 Polymerized rosin ester (trade name "Pencel D-125":
Softening point 125 ° C .: Acid value 15; Arakawa Chemical Industry Co., Ltd.) 6
0 parts and maleic modified rosin (trade name "SS-14":
Softening point 110 ° C: Acid value 285; Arakawa Chemical Industry Co., Ltd.)
A tackifying resin composition consisting of 40 parts was melted at 180 ° C. for about 1 hour and then cooled to 150 ° C. Next, 5 parts of an anionic emulsifier (trade name “Monogen Y-100”, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was added, and 120 ° C. under pressure.
Kneading was performed for 60 minutes. Further, 105 parts of water was added and stirred for 10 minutes to obtain an emulsion of a tackifying resin having a solid content of 50%.

Example 2 In Example 1, the tackifying resin composition was prepared by polymerizing rosin ester (trade name "Pencel D-125": softening point 12).
5 ° C .: acid value 15; Arakawa Chemical Industries Co., Ltd. 40 parts and maleated modified rosin (trade name “SS-14”: softening point 11)
0 ° C .: Acid value 285; manufactured by Arakawa Chemical Industry Co., Ltd.) In the same manner as in Example 1 except that 60 parts were used to obtain a tackifying resin emulsion.

Example 3 In Example 1, the tackifying resin composition was prepared by polymerizing rosin ester (trade name "Pencel D-125": softening point 12).
5 ° C .: Acid value 15; Arakawa Chemical Co., Ltd. 30 parts and maleated modified rosin (trade name “SS-14”: softening point 11)
An emulsion of a tackifying resin was obtained in the same manner as in Example 1 except that 70 parts of 0 ° C .: acid value of 285; manufactured by Arakawa Chemical Industry Co., Ltd. was used.

Example 4 In Example 1, the tackifying resin composition was treated with a rosin ester (trade name "Pencel GA-90": softening point 90 ° C .:
Acid value 3; Arakawa Chemical Industry Co., Ltd. 60 parts and maleic modified rosin (trade name "SS-14": softening point 110 ° C .: acid value 285; Arakawa Chemical Industry Co., Ltd.) 40 parts, 15
An emulsion of the tackifying resin was obtained in the same manner as in Example 1 except that the mixture was melted at 0 ° C for about 1 hour and then cooled to 100 ° C.

Example 5 In Example 1, the tackifying resin composition was applied to a fumarized rosin ester (trade name "Marquide No. 30A": softening point 115 ° C: acid value 190; manufactured by Arakawa Chemical Industry Co., Ltd.). An emulsion of the tackifying resin was obtained in the same manner as in Example 1 except that the emulsion was used instead.

Comparative Example 1 In Example 1, the tackifying resin composition was prepared by polymerizing rosin ester (trade name "Pencel D-125": softening point 12).
5 ° C .: acid value 15; Arakawa Chemical Co., Ltd. 10 parts and maleated modified rosin (trade name “SS-14”: softening point 11)
0 ° C .: Acid value 285; manufactured by Arakawa Chemical Industry Co., Ltd.) An emulsion of a tackifying resin was obtained in the same manner as in Example 1 except that 90 parts were used.

Comparative Example 2 In Example 1, the tackifying resin composition was prepared by polymerizing rosin ester (trade name "Pencel D-125": softening point 12).
5 ° C .: Acid value 15; A tackifying resin emulsion was obtained in the same manner as in Example 1 except that it was used instead of Arakawa Chemical Industry Co., Ltd.

Comparative Example 3 In Example 1, the tackifying resin composition was mixed with rosin ester (trade name "Super Ester A-75": softening point 7).
5 ° C: Acid value 7; 150 in place of Arakawa Chemical Industry Co., Ltd.
An emulsion of a tackifying resin was obtained in the same manner as in Example 1 except that the mixture was melted at 90 ° C for about 1 hour and then cooled to 90 ° C.

Comparative Example 4 Except that the tackifying resin composition in Example 1 was replaced with gum rosin (softening point 75 ° C .: acid value 175), the mixture was dissolved at 150 ° C. for about 1 hour and then cooled to 90 ° C. Example 1
An emulsion of the tackifying resin was obtained in the same manner as in.

Comparative Example 5 In Example 1, the tackifying resin composition was replaced with a rosin ester (trade name "KE-364C": liquid: acid value 35; manufactured by Arakawa Chemical Industry Co., Ltd.) at 60 ° C. An emulsion of a tackifying resin was obtained in the same manner as in Example 1 except that the temperature was kept for about 1 hour and then cooled to 55 ° C.

[0040]

[Table 1]

The workability in the emulsification of the tackifier resin (whether or not the emulsion can be prepared without problems), which was carried out in Examples and Comparative Examples, was visually judged. The judgment results are shown in Table 2. ◯: No problem. (Good emulsification property) Δ: Some problem. (Slightly poor emulsifiability (a small amount of aggregates are observed)) x: There is a problem. (Poor emulsifiability (many aggregates are seen))

The storage stability in the emulsification of the tackifying resin was 40 ° C.
After standing in the constant temperature bath for 2 weeks, changes in viscosity, pH and particle size with time were measured. The judgment results are shown in Table 2. ◯: No change △: Slight change X: Change

[0043]

[Table 2]

Performance Evaluation of Aqueous Adhesive Composition Acrylic polymer emulsion 10 obtained in Production Example 1
A preparation prepared by mixing 0 parts (solid basis) with 70 parts (solid basis) of the tackifying resin emulsions obtained in the above Examples and Comparative Examples was further added with a filler (trade name "ESCALON # 1".
00 ", manufactured by Sankyo Seiko Co., Ltd., 125 parts (solid basis), water retention agent (trade name" Tripropylene glycol ", manufactured by Tokyo Kasei Kogyo Co., Ltd.) 10 parts, thickener (trade name" Primal A ").
SE-60 "(manufactured by Japan Acrylic Co., Ltd.) 0.5 part (solid basis) was added and thickened with aqueous ammonia to obtain an adhesive composition. Various tests were performed on the obtained water-based adhesive composition by the following performance evaluation methods.

(Adhesive Performance Test) The adhesive properties were evaluated by the following test methods. (1) Coatability The coatability of the above water-based adhesive composition to the smooth surface of the fiber-reinforced cement plate was trowel-stretched, and comb-out and trowel breakage were relatively visually evaluated. The evaluation results are shown in Table 3. ◯: Good Δ: Slightly bad (slightly dripping during application) X: Bad (slightly dripping during application) (2) Initial adhesive strength Width 70 mm, length 150 mm and thickness 8 mm Smooth surface of cement board Then, a pressure-sensitive adhesive tape defined in JIS Z 1525 is attached so that an adhesive surface having a width of 30 mm remains in the central part, and the above water-based adhesive composition is uniformly applied to the surface with a comb edge. The adhesive tape should be peeled off immediately after application. After 20 minutes or 60 minutes of open time, a vinyl floor sheet with a width of 25 mm and a length of 200 mm is stuck together, and after reciprocating twice with a hand roller of about 5 kg from above the vinyl floor sheet, pressure bonding, and then 1 on the top surface of the vinyl floor sheet.
A weight with a mass of 10 g per cm 2 is placed and cured for 1 hour.
Then, a weight of 200 g was hung on one end of the vinyl floor sheet, and the time until peeling off the entire surface at 90 ° was measured. The evaluation results are shown in Table 3. (3) 90 degree peeling adhesive strength A test piece was prepared in the same manner as the initial adhesiveness except that the curing time was changed to 168 hours. Then, using a jig for 90 degree peeling adhesion strength test, the displacement speed is 200 mm / m.
The 90 degree peel adhesion strength was measured in. The evaluation results are shown in Table 4. (4) Tensile bond strength Steel attachments are bonded to the smooth surface of vinyl floor tiles with a width of 40 mm and a length of 40 mm with an adhesive (trade name "Bond Quick Mender", manufactured by Konishi Co., Ltd.), and the test floor is used. Created a tile. An appropriate amount of the above water-based adhesive composition is placed on a smooth surface of a fiber-reinforced cement plate having a width of 70 mm, a length of 70 mm and a thickness of 8 mm, and the mixture is uniformly applied with a comb edge. After the opening time of 20 minutes or 60 minutes, the test floor tile is placed, and a weight having a mass of 1 kg is placed on the test floor tile for 5 seconds, and then the weight is removed and curing is performed for 168 hours. After that, using a jig for tensile strength test, displacement speed 3m
The tensile adhesive strength was measured at m / min. Table 4 shows the evaluation results
Shown in.

[0046]

[Table 3]

[0047]

[Table 4]

Claims (6)

[Claims] 1. A tackifier resin emulsion comprising a tackifier resin, an emulsifier and water, wherein a tackifier resin composition having an acid value of 90 to 220 and a softening point of 80 to 160 ° C. is used. Characterized tackifying resin emulsion. 2. The tackifying resin emulsion according to claim 1, wherein the tackifying resin composition contains unsaturated acid-modified rosins. 3. The tackifying resin emulsion according to claim 2, wherein the content of the unsaturated acid-modified rosin in the tackifying resin composition is 70% by weight or less. 4. At least one base polymer selected from the group consisting of acrylic polymer emulsion, rubber latex and synthetic resin emulsion.
4. A water-based adhesive composition comprising the tackifying resin emulsion according to any one of 3 to 3. 5. An acrylic polymer emulsion and / or
Alternatively, 10 to 100 parts by weight of the tackifying resin emulsion according to any one of claims 1 to 3 (based on the solid content) relative to 100 parts by weight of the synthetic resin emulsion (based on the solid content).
The water-based adhesive composition according to claim 4, which comprises: 6. A composition comprising 10 to 150 parts by weight (as solid content) of the tackifying resin emulsion according to claim 1 to 100 parts by weight (as solid content) of a rubber latex. The water-based adhesive composition according to claim 4.