JPS6247914B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a novel solvent-free type that has significantly improved various properties such as workability, stain resistance, initial adhesiveness, and water resistance by making it possible to spray apply a specific hydrosol composition with pressure-sensitive adhesive properties. The present invention relates to a water-dispersed aerosol type pressure-sensitive adhesive composition. Traditionally, pressure-sensitive adhesives have been applied either directly to the adhesive surface or as pressure-sensitive adhesive tapes that are applied to one or both sides of a support such as paper or plastic film, but the former is widely used. There are problems in terms of area application and workability, and in the latter case, it is difficult to use especially on rough surfaces, and its usage is limited. As a way to solve these problems, spray application of pressure-sensitive adhesives has the advantage of being easy to work with and can be applied uniformly to rough surfaces, so it can be used not only for industrial purposes but also for general household use. There are also many. As an aerosol type pressure sensitive adhesive, Tokko Sho
As seen in Japanese Patent No. 46-12460, a solvent type using an organic solvent as a medium is used. However, although these solvent-based aerosol pressure-sensitive adhesives are good in terms of sprayability and various adhesive properties, they are relatively low in concentration to prevent stringing during spraying, so they cannot be used in large quantities. Since organic solvents are inevitably used, they pose flammability during use, inhalation toxicity to the human body, and other pollution-related problems, so it is necessary to pay close attention when using them. Spray versions of emulsion-type pressure-sensitive adhesives have been developed to improve the above-mentioned problems, but while they are non-polluting, they are not used as air sprays or airless sprays due to the stability of the emulsion particles. However, from the viewpoint of portability, it could not be used as an aerosol spray, which is the simplest and most requested. In other words, when an emulsion-type pressure-sensitive adhesive is sealed in a pressure can with a propellant such as liquefied petroleum gas (LPG), chlorofluorocarbon gas, or ethers, the emulsion particles swell, coagulate, and gel due to the propellant during storage. , causing phenomena such as thickening and becoming unstable. Furthermore, when sprayed, the emulsion particles are destroyed by large mechanical shearing forces at the nozzle, resulting in clogging of the nozzle, resulting in poor spray performance, and the interface used during the production of the pressure-sensitive adhesive. At present, solvent-free aerosol pressure-sensitive adhesives have not yet been put into practical use due to problems such as the unavoidable foaming caused by the activator during spraying and the inability to achieve uniform application. . As a result of repeated studies to obtain an aerosol-type pressure-sensitive adhesive, the present inventors discovered that a hydrosol composition obtained by cross-linking a specific monomer in a specific amount to the above-mentioned hydrosol was sprayed onto a hydrosol composition. We have discovered that by using the agent as an essential component, aerosol spraying becomes possible, and the resulting coating film has excellent initial adhesive strength and cohesive strength, leading to the present invention. That is, the present invention provides an unsaturated monomer 1 having an acidic group.
A copolymer with a weight average molecular weight of 10 ⁴ to 10 ⁶ consisting of ~20% by weight and 80 to 99% by weight of other acrylic unsaturated monomers that can be copolymerized with this is mixed with an alkali and water. Average particle diameter of 0.01 to 0.1 obtained by neutralizing some or all of the acidic groups in the copolymer and inverting the phase.
A hydrosol composition obtained by cross-linking a monomer having two or more ethylenically unsaturated bonds in an amount of 0.01 to 15 parts by weight based on 100 parts by weight of the solid content of the hydrosol in a water-dispersed hydrosol of micrometers, and The present invention provides an aerosol-type pressure-sensitive adhesive composition which contains the following agent as an essential component. The unsaturated monomer having an acidic group used to obtain the copolymer in the present invention is an essential component for introducing an important functional group into the copolymer during hydrosolization, such as acrylic acid, Unsaturated carboxylic acids such as methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, styrene sulfonic acid, allyl sulfonic acid, sulfopropyl macrylate, 2-acryloyloxynaphthalene.
2-sulfonic acid, 2-methacryloyloxynaphthalene-2-sulfonic acid, 2-acrylamide-
Examples include unsaturated sulfonic acids such as 2-methylpropanesulfonic acid and 2-acryloyloxybenzenesulfonic acid, and one or more of these monomers can be used. The amount of the unsaturated monomer having an acidic group is as follows:
1 to 20% by weight, preferably 3 to 10% by weight in the monomer mixture to obtain the copolymer. If the amount of the monomer used is less than 1% by weight, it is difficult to form a hydrosol, and if it is used in excess of 20% by weight, adhesive properties such as tackiness and adhesion may be impaired. be. On the other hand, other acrylic unsaturated monomers that can be copolymerized with the above monomers are important components for imparting pressure-sensitive adhesive properties, such as ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. ,
isooctyl acrylate, ethyl methacrylate,
Main examples include (meth)acrylic acid alkyl esters in which the alkyl group has 2 to 15 carbon atoms, such as butyl methacrylate, and one or more of these monomers can be used. Furthermore, as a modifying monomer, in addition to the above monomers, (meth)acrylic acid alkyl esters in which the number of carbon atoms in the alkyl group is outside the above range, such as methyl acrylate and methyl methacrylate, vinyl acetate, acrylonitrile, styrene, and acrylic acid. Monomers such as 2-methoxyethyl, vinyl ethers, glycidyl acrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, acrylamide, N-methylolacrylamide are substituted in an amount of 40% by weight or less of the above monomers. It is also possible to use them together. The amount of the copolymerizable acrylic unsaturated monomer used is 80% in the monomer mixture to obtain the copolymer.
~99% by weight, preferably 90-97% by weight. A mixture of these monomers can be copolymerized by a conventionally known method such as a solution mixing method, an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method, etc., but particularly preferably a bulk polymerization method and a small amount of This is a solution polymerization method using a solvent. Among these polymerization methods, in the bulk polymerization method, the acrylic copolymer obtained by the polymerization method can be used as it is as a raw material for hydrosolization. In the solution polymerization method, if the amount of solvent used is more than 20% by weight, the organic solvent is removed after polymerization by means such as distillation, but even if the amount is less than 20% by weight, the content is reduced or eliminated by the above methods. It is desirable to do so. As the solvent used in this solution polymerization method, various general organic solvents can be used, but methyl alcohol, ethyl alcohol, n-
It is desirable to use alcohol-based hydrophilic solvents such as butyl alcohol, n-propyl alcohol, isopropyl alcohol, and sec-butyl alcohol, or oligomers or propolymers having hydrophilic groups such as hydroxyl groups, carboxyl groups, and amino groups. On the other hand, in other polymerization methods, the medium used in each method is removed by appropriate means after synthesis to obtain a solid material substantially free of medium. That is, in the emulsion polymerization method, water is removed by coagulating and separating by salting out, and in the suspension polymerization method, water is removed by filtering the particulate copolymer. At this time, it is desirable that the medium other than the organic solvent be completely removed, but some remaining is allowed. In addition, in the emulsion polymerization method and suspension polymerization method, some of the emulsifier or dispersant used during polymerization adheres to the surface of the copolymer particles, but these are removed during the above-mentioned medium removal operation, and if necessary, It can be removed almost completely by washing several times. In addition, in the emulsion polymerization method, highly three-dimensional copolymers, so-called gelled products, may be produced, but such copolymers can be an obstacle to hydrosolization, and are In this case, it is desirable to prevent the formation of the copolymer as much as possible. However, even if a small amount of the copolymer is produced, it can be solved by masticating with a high shearing force using a mixing roll, a Banbury mixer, or the like. It is necessary to design the weight average molecular weight of the copolymer thus obtained to be in the range of 10 ⁴ to 10 ⁶ , because if the molecular weight is too low, the cohesive force of the pressure-sensitive adhesive of the present invention will be poor. Furthermore, even if the coating material is sprayed onto the object and then adhered, sufficient adhesive strength may not be obtained and the coating material may fall off, which is not preferable. Furthermore, if the molecular weight is too high, it becomes difficult to form a hydrosol, which may lead to unfavorable results in terms of adhesive properties and the like. While stirring the copolymer obtained as above, alkali and water are added to neutralize some or all of the acidic groups in the copolymer, and O/
A water-dispersed hydrosol is prepared by phase inversion to a W-type, but in order to facilitate hydrosolization, 20 parts by weight or less of methyl alcohol, ethyl alcohol, n
- After adding an alcoholic water-soluble solvent such as propyl alcohol, isopropyl alcohol, or sec-butyl alcohol, an alkali and water may be added for phase inversion. Examples of the alkali used here include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, amines such as ethylamine and propylamine, ammonia, and α-aminoethyl alcohol. A material that can be easily scattered when sprayed is preferable, and can prevent deterioration of adhesive properties due to residual non-volatile alkali. The amount of alkali used above is determined based on the amount of acidic groups in the copolymer in order to neutralize some or all of the acidic groups in the copolymer.
It may be added in a proportion of 0.02 to 2 equivalents. The temperature during neutralization treatment can be appropriately set depending on the type and properties of the copolymer, but is generally preferably in the range of 30 to 95°C. As an example of the method for neutralization treatment and hydrosolization, a predetermined amount of alkali or alkaline aqueous solution is first added to the polymerized and separated copolymer, and the mixture is well stirred, and then water is gradually added to cause phase inversion. There is a method in which an O/W type dispersion in which copolymer particles are finely dispersed is produced by using water as a continuous phase, but the method is not limited to this method. An aqueous alkaline solution may be added instead of the water used to perform neutralization and hydrosolization at the same time. The water-dispersed hydrosol thus obtained is
It is stably dispersed with an average particle diameter in the range of 0.01 to 0.1 μm, the solid content concentration for good sprayability is 5 to 45% by weight, and the viscosity is 0.1 to 1000 poise at a measurement temperature of 25°C. It is. The monomer having two or more ethylenically unsaturated bonds used in the present invention is a component for cross-linking within the water-dispersed hydrosol particles obtained above and improving the cohesive force inside the particles. , poly(meth)acrylated monomers of polyhydric alcohols, and divinylbenzene are suitable; examples of the poly(meth)acrylated monomers include ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, Triethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate,
Polypropylerolpropane tri(meth)acrylate, 1,4-butanediol di(meth)acrylate, 1,3-butylene glycol di(meth)acrylate, tetramethylolmethanetetra(meth)acrylate, pentaerythritol tri(meth)acrylate, Examples include allyl methacrylate, diallyl phthalate, triallyl cyanurate, triallyl isomyanurate, and triallyl trimellitate, and one or more of these monomers can be used. Since it is necessary to sufficiently impregnate the above monomer into the hydrosol particles, it is desirable to use a highly oil-soluble monomer from the viewpoint of the time required for impregnation and the distribution ratio. The monomer having two or more ethylenically unsaturated bonds is desirably added in an amount of 0.01 to 15 parts by weight, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of the solid content of the hydrosol. Addition amount is 0.01
If it is less than 15 parts by weight, sufficient intra-particle cross-linking will not take place and no improvement in cohesive force can be expected; if it exceeds 15 parts by weight, intra-particle cross-linking will proceed excessively, resulting in a decrease in adhesive strength. This is undesirable as it causes a decrease in initial adhesion. The polymerization initiator used when post-polymerizing the above-mentioned monomer having two or more ethylenically unsaturated bonds for cross-linking is not particularly limited as long as it causes radical polymerization, such as benzoyl peroxide, tertiary butyl peroxide,
Organic peroxides such as halogenated benzoyl peroxide, azo compounds such as azobisisobutyronitrile, azobisisobutyramide, methylvaleronitrile, diazoaminoazobenzene, persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate. Examples include redox initiators using salts, or combinations of these persulfates with reducing agents such as sulfites and bisulfites, hydrogen peroxide, etc., to reliably and uniformly initiate post-polymerization within the hydrosol particles. In order to achieve this, it is desirable to select a hydrogen abstraction type oil-soluble initiator such as an organic peroxide. The amount of these polymerization initiators to be used is 0.01 to 5 parts by weight, preferably 0.1 to 3 parts by weight, based on 100 parts by weight of the monomers used in the postpolymerization for cross-linking. As a method for post-polymerizing the monomer, a predetermined amount of the monomer having two or more ethylenically unsaturated bonds is added all at once to the previously hydrosolized copolymer, and the mixture is thoroughly stirred and mixed. Alternatively, the monomer can be added dropwise to the hydrosol particles to impregnate them into the hydrosol particles. The polymerization initiator may be dissolved or dispersed in the monomer and added to the hydrosol, or may be added before or after the monomer is added to the hydrosol. In the method of adding monomer dropwise, the polymerization reaction is generally started and progressed simultaneously with the dropwise addition of the monomer, and care is taken to maintain a concentration that does not destabilize the hydrosol and the rate of dropping. It is necessary to ensure that the polymerization proceeds uniformly. Furthermore, it is important to start the polymerization reaction after the monomer is sufficiently impregnated into the hydrosol particles.If the monomer is present in the form of oil droplets in the system, the monomer is absorbed outside the particles. Since a homopolymer of polymers is produced, intraparticle crosslinking is not performed and desired effects cannot be expected. Therefore, it is necessary to maintain the temperature of the reaction system at a low temperature until the impregnation of the added monomer is completed, and after the completion of impregnation, if a thermally cleavable initiator is used, the temperature of the reaction system should be maintained at a low temperature of 40 to 90°C. Furthermore, when a redox initiator is used, the temperature is raised to above room temperature to initiate the polymerization reaction. The hydrosol composition obtained as described above is
2 ethylenically unsaturated bonds inside the hydrosol particles
A water-dispersed hydrosol which is obtained by addition polymerization or graft polymerization of cross-linking monomers having more than 100% cross-linking monomers, has a highly three-dimensional morphology, and has an average particle diameter before post-polymerization cross-linking. There is almost no difference from particles, the size is in the range of about 0.01 to 0.1 μm, and it is stably dispersed in water. In the hydrosol composition obtained as described above,
If necessary, external crosslinking agents may be added before or after postpolymerization to improve the adhesive properties, and also the usual tackifiers, softeners, plasticizers, fillers, particle stabilizers, film formers. There is also a process of blending various additives such as auxiliary agents, colorants, fragrances, fluorescent agents, anti-aging agents, rust preventives, antibacterial agents, and small amounts of hydrophilic solvents such as alcohols and cellosolves, as well as propellants described below. It can be added in any manufacturing process, including. The aerosol-type pressure-sensitive adhesive composition of the present invention is filled into a sealed aerosol pressure-resistant container containing the hydrosol composition and a propellant as essential components. Examples of propellants used include LPG, fluorocarbon gas, Any propellant commonly used as an aerosol propellant such as dimethyl ether can be used, but chlorofluorocarbon gas and dimethyl ether are preferred from the viewpoint of sprayability. The propellant and the hydrosol composition (solid content concentration 5 to 45% by weight)
The blending ratio is usually 30-90% by weight/10-70% by weight
It can be selected as appropriate depending on the purpose of use and the type of monomer used. If the blending ratio of the propellant exceeds the above range, a large amount of spraying will be required to obtain the desired adhesiveness. Furthermore, if the blending ratio is small, the viscosity of the system becomes high, making it impossible to spray uniformly and resulting in a failure to obtain a uniform coating film. As described above, the aerosol-type pressure-sensitive adhesive composition of the present invention contains monomers having cross-linking properties inside particles obtained by hydrosolizing a specific acrylic copolymer having an acidic group by the above-mentioned method. Since the highly three-dimensional ultrafine particle hydrosol composition is post-polymerized and used in combination with a propellant, it has storage stability and sprayability that cannot be achieved with an emulsion type. This can solve the problems associated with pollution, which are the drawbacks of solvent-based products. That is, when the composition of the present invention is sprayed, it does not foam because it does not contain a surfactant, and because the particle size is very fine at about 0.01 to 0.1 μm, a uniform coating film is obtained. The coating film exhibits excellent initial adhesive strength due to early drying properties that are proportional to fine particle size, and has sprayability comparable to solvent-based coatings, as well as a highly three-dimensional structure inside the particles. It also has excellent storage stability and adhesive properties due to improved cohesive force. Examples of the present invention will be shown below and will be described in more detail, but the present invention is not limited to these and can be applied in various ways without departing from the technical idea. In addition, parts in the examples mean parts by weight. Example 1 90 parts of n-butyl acrylate, ethyl acrylate
10 parts, acrylic acid 9 parts, benzoyl peroxide
10% by weight of a mixture consisting of 0.1 part of lauryl mercaptan and 0.05 part of lauryl mercaptan was charged into a four-necked flask.
Nitrogen substitution was performed for about 40 minutes while stirring. Next, the inner bath temperature was raised to start the polymerization reaction, and the remaining mixture was added dropwise for 4 hours while the reaction temperature was controlled at 83°C ± 5°C depending on the stirring speed, outer bath temperature, and dropping rate of the remaining mixture. A copolymer having a weight average molecular weight of 5×10 ⁵ (according to GPC) was prepared by the reaction. Next, for the carboxyl group of the above copolymer,
Neutralization was performed by adding 0.4 equivalents of aqueous ammonia (10% by weight), and water was further added for phase inversion to obtain a hydrosol in which the continuous phase was water. The obtained hydrosol had a solid content concentration of 29.3% by weight, a viscosity of 24 poise at 25°C, and an average particle size (according to Nysizer) of 0.05μ.
It was m. Furthermore, the obtained hydrosol was heated to approximately 40°C while stirring under a nitrogen stream to reduce the solid content of the hydrosol.
A mixed solution of 2.3 parts by weight of diethylene glycol dimethacrylate and 0.0046 parts of benzoyl peroxide per 100 parts by weight was added dropwise over about 1 hour to sufficiently impregnate the hydrosol particles.
The inner bath temperature was raised to 70 to 80°C and the polymerization reaction was carried out for about 2 hours to obtain a hydrosol composition having a solid content concentration of 29.5% by weight, a viscosity at 25°C of 20 poise, and an average particle size of 0.05 μm. A mixture of 1.5 parts of methylcellosolve and 0.5 parts of fragrance added to 100 parts of the obtained hydrosol composition was added to 60 parts of the resulting hydrosol composition.
% by weight and dimethyl ether at a ratio of 40% by weight, and filled into an aerosol can to obtain an aerosol type pressure-sensitive adhesive composition of the present invention. Example 2 10% by weight of a monomer mixture consisting of 80 parts of 2-ethylhexyl acrylate, 15 parts of n-butyl acrylate, 5 parts of acrylonitrile, and 8 parts of methacrylic acid and 5 parts of n-propyl alcohol were added to four mouths. The mixture was placed in a flask and purged with nitrogen for about 40 minutes while stirring. Next, 0.1 part of benzoyl peroxide was added and after completely dissolving, the temperature was raised to 80°C to start polymerization. The polymerization reaction was carried out by controlling the reaction temperature at 83°C ± 5°C by adjusting the stirring speed, external bath temperature, and dropping speed while dropping the remaining monomer mixture, and reacting for 4 hours to achieve a weight average molecular weight of 4 × 10 A copolymer of ⁵ (by GPC) was prepared. Next, for the carboxyl group of the above copolymer,
0.8 equivalents of ammonia aqueous solution (10% by weight) and water were added, and neutralization and phase inversion were performed at a temperature of 70°C to obtain a hydrosol in which the continuous phase was water. The obtained hydrosol had a solid content concentration of 33% by weight, a viscosity of 72 poise at 25°C, and an average particle size (measured by Nanosizer) of 0.06 μm. Furthermore, 5 parts of divinylbenzene was added to 100 parts of the solid content of the hydrosol while stirring the obtained hydrosol under a nitrogen stream, and after sufficiently impregnating it into the hydrosol particles, the inner bath temperature was raised to about 65%. ℃, and ammonium persulfate was added as a polymerization initiator.
0.015 part was added to initiate polymerization. reaction temperature
The polymerization reaction was carried out for about 3 hours while maintaining the temperature at 75±5°C to obtain a hydrosol composition having a solid content concentration of 33% by weight, a viscosity at 25°C of 57 poise, and an average particle size of 0.07 μm. 35 parts of dichlorodifluoromethane (Freon 12) was mixed with 65 parts of the obtained hydrosol composition, and the mixture was filled into an aerosol can to obtain an aerosol-type pressure-sensitive adhesive composition of the present invention. Example 3 A mixed solution consisting of 90 parts of n-butyl acrylate, 10 parts of 2-methoxyethyl acrylate, 5 parts of acrylic acid, 0.15 parts of lauryl mercaptan, 3 parts of polyoxyethylene alkyl phenol ether, and 160 parts of water was poured into four mouths. Pour into a flask and heat to 70°C while stirring.
5 parts of potassium persulfate aqueous solution (2% concentration by weight) was added to initiate polymerization, and the reaction temperature was increased to approximately
Emulsion polymerization was carried out for 3 hours while maintaining the temperature at 70°C.
A copolymer emulsion with a weight average molecular weight of 5×10 ⁵ (according to GPC) was obtained. Next, the obtained copolymer emulsion was salted out by a conventional method, and the precipitated copolymer was filtered, washed with water,
After drying and mixing 5 parts of isopropyl alcohol to 100 parts of the copolymer, Example 1 was prepared.
A hydrosol was obtained in the same manner as above. The obtained hydrosol had a solid content concentration of 32% by weight and a viscosity at 25°C.
53 poise, average particle size (according to Nanosizer)
It was 0.08 μm. Furthermore, while stirring the obtained hydrosol at room temperature under a nitrogen stream, 0.8 parts of trimethylolpropane trimethacrylate and a potassium persulfate aqueous solution (1% by weight) were added to 100 parts of the solid content of the hydrosol.
After adding 0.4 parts (concentration) and sufficiently impregnating it into the hydrosol particles, the inner bath temperature was raised to 40°C, and a 1% by weight aqueous solution of sodium bisulfite in an equimolar amount with the potassium persulfate was added. Polymerization was started. The reaction was carried out for about 3 hours, and the solid content concentration was 31% by weight.
Viscosity at 25°C: 47 poise, average particle size: 0.08μm
A hydrosol composition was obtained. The obtained hydrosol composition was subjected to the same operations as in Example 1 to obtain an aerosol type pressure-sensitive adhesive composition of the present invention. Comparative Example: Without hydrosolizing the copolymer emulsion obtained in Example 3,
The viscosity was increased by adding 0.3 equivalents of ammonia aqueous solution (25% by weight) to obtain an emulsion type pressure sensitive adhesive. The emulsion had a solid concentration of 39.2% by weight, a viscosity of 90 poise at 25°C, and an average particle size (according to Nanosizer) of 0.15 μm. The obtained emulsion-type pressure-sensitive adhesive was subjected to the same operations as in Example 1 to obtain an emulsion-type aerosol-type pressure-sensitive adhesive composition. Using the aerosol type pressure-sensitive adhesive composition obtained in each example, spray uniformly onto each target material shown in Table 1 at a coating amount of 100 g/ ^m2 , and after 5 seconds apply it to the target material. After combining them and pressing them back and forth once with a 1 kg roller, they were left to stand for a predetermined period of time. After standing, the material to be coated was peeled off in a direction of 180 degrees to the surface to which it was applied, and the adhesive strength was measured. The measurement results are shown in Table 1. Furthermore, when the emulsion-type aerosol-type pressure-sensitive adhesive composition obtained in the comparative example was sprayed, sagging and aggregates occurred at the spout, and the sprayability was very poor, making it impossible to obtain a uniform coating film. Nakatsuta.
Foaming was also observed on the coated surface. Furthermore, the contents agglomerated one week after storage, making spraying completely impossible.

【table】

[Table] As is clear from Table 1, when the aerosol type pressure-sensitive adhesive composition of the present invention is sprayed, initial adhesion develops very quickly, good adhesive strength is obtained, and the sprayability is good. No foaming or occurrence of aggregates or sag at the spout was observed. Furthermore, the contents did not aggregate even after being stored at 40°C for 6 months, demonstrating excellent storage stability.

Claims (1)

[Claims] 1 1 to 20% by weight of unsaturated monomers having acidic groups
and 80 to 99% by weight of other acrylic unsaturated monomers copolymerizable with this, weight average molecular weight ¹⁰⁴
A water-dispersed hydrosol with an average particle diameter of 0.01 to 0.1 μm obtained by adding an alkali and water to the copolymer of ~10 ⁶ to neutralize some or all of the acidic groups in the copolymer and inverting the phase. The solid content of the hydrosol is 100%
An aerosol-type pressure-sensitive adhesive composition comprising a hydrosol composition formed by cross-linking monomers having two or more ethylenically unsaturated bonds in an amount of 0.01 to 15 parts by weight based on the weight part, and a propellant as essential components. thing.