JP3396536B2 - Aqueous coating composition and method of processing packaging container using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aqueous coating composition having an anti-slip effect for preventing the collapse of the load of paper containers such as corrugated cardboard and carton and various paper bags, and the anti-slip of a packaging container using the same. It relates to a processing method.

[0002]

2. Description of the Related Art Various food products such as agricultural products and marine products, and various industrial products are packaged and transported in paper containers such as cardboard and cartons and various paper bags.

In recent years, the efficiency of distribution has been improved by automating various packaging lines and palletizing transportation lines. At that time, if the corrugated cardboard case slips, the load collapses, which is very dangerous. This is a cause of reduced transport efficiency.

As a method for imparting anti-slip properties to these paper containers and paper bags, conventionally, a method of printing a design with a water-based printing ink and then applying an adhesive varnish to prevent slippage by the adhesive force, Alternatively, a typical method is to form a film having unevenness on the surface of a paper container or the like with a non-adhesive varnish, and prevent slippage by physically engaging the unevenness.

For example, as a method of using the above-mentioned adhesive varnish, JP-A-61-186597 and JP-A-2 are available.
There is a method of applying an adhesive varnish containing an acrylic copolymer having an adhesive property as a main component, which is disclosed in Japanese Patent Publication No. 34671-34, by an appropriate printing or coating means. However, with an adhesive type anti-slip varnish, the higher the anti-slip effect, the more likely it is that blocking will occur on the contact surface, and that dust and dirt will adhere during transportation,
There is a problem that the printed matter is stained, and anti-slip properties, which are contradictory properties, blocking resistance, and stain resistance cannot be obtained at the same time.

On the other hand, as a non-adhesive type anti-slip varnish,
There is a method in which a non-sticky varnish is prepared by using a water-based resin binder and fine inorganic particles such as silicic acid anhydride as main components and applying it by an appropriate printing or coating means.

However, in the non-adhesive type anti-slip varnish, the initial anti-slip effect can be expected to some extent, but if the re-loading work is repeatedly performed, the anti-slip effect tends to be extremely lowered because the contact surfaces rub against each other. The anti-slip effect was lacking in sustainability. Further, in order to enhance the anti-slip effect, it is necessary to contain a large amount of inorganic particles and the like, but there are many problems such as a decrease in abrasion resistance and a lack of cosmetic appearance on the printed surface due to whitening of the anti-slip varnish. It was

Therefore, Japanese Patent Laid-Open No. 1-308748 discloses a method for solving the above problems by preparing a non-adhesive varnish containing a composite emulsion of an acrylic copolymer and colloidal silica as a main component. .

However, these complex emulsions have problems that they are difficult to produce, a uniform product cannot be obtained, dispersion stability and compatibility with other resins are low.

[0010]

Therefore, the problem to be solved by the present invention is to develop an anti-slip varnish composition in which all of the above problems are solved, and a high anti-slip effect can be maintained and blocking resistance can be improved. Another object of the present invention is to develop an aqueous coating composition which has excellent abrasion resistance and does not impair the cosmetic appearance of printed matter.

[0011]

That is, the present invention is mainly composed of a water-dispersible binder resin obtained by emulsion-polymerizing a radical-polymerizable monomer in the presence of an emulsifier, an inorganic filler, and water. in that aqueous coating composition, the water-dispersible binder resin, and inorganic filler, a components: a) having an alkyl group having 8 to 18 carbon atoms (meth) acrylic acid alkyl ester compound, and b) its other a radical polymerizable monomer is E by emulsion polymerization, and low tack which glass transition temperature is -50～20 ° C.
Water-dispersible binder resin having a releasing property with sex, and B component: 1 × containing ^10-4 inorganic filler having an average particle diameter of to 5 × 10 ^-2 mm, and the following conditions 1 and 2 To provide an aqueous coating composition.

[0012] Condition 1 of the total water-dispersible binder resin, component A is Ri 30-100 wt% der, other than component A
The water-dispersible binder resin is 70 to 0% by weight .

Condition 2 x defined by the following general formula (1) and the weight ratio y of the B component / aqueous coating composition are x = 0.07 to 0.28 y / x = 0.15 Satisfies 1.20.

X = Σ (k · m · n) (1) (where, k: weight ratio of component A / aqueous coating composition, m: (meth) acrylic having an alkyl group having 8 to 18 carbon atoms Acid alkyl ester compound / weight ratio of all radical-polymerizable monomers used for synthesizing component A, n: sum of atomic weights of all atoms constituting an alkyl group having 8 to 18 carbon atoms / 8 to 18 carbon atoms Ratio of molecular weight of (meth) acrylic acid alkyl ester compound having alkyl group of Σ, (k · m · n): k for each A component when one or more A components are used , M and n).

The present invention is further characterized in that, in the above aqueous coating composition, a (meth) acrylic acid alkyl ester compound having an alkyl group having 8 to 12 carbon atoms is used as component A a). An aqueous coating composition is provided. The present invention further provides the above-mentioned aqueous coating composition odor
Other radically polymerizable monomer as component b))
The body has (meth) acrylic acid, maleic acid, their methyl groups.
Having a vinyl ester or ethyl ester
From the group consisting of aromatic compounds having 8 or 9 carbon atoms
Aqueous coating composition characterized by being selected
I will provide a.

The present invention further provides an aqueous coating composition, wherein x is 0.12 to 0.18 in the above aqueous coating composition.

The present invention further provides a method for processing a packaging container, which comprises applying the above-mentioned water-based coating composition to the surface of a paper container, a paper bag or a sheet material thereof to form an anti-slip coating layer. .

[0018]

FUNCTION AND EXAMPLES The aqueous coating composition of the present invention has anti-slip effect, anti-blocking property and anti-staining property, which are contrary to the conventional anti-slip varnish consisting of adhesive binder resin and inorganic filler. It has performance.

First, a conventional anti-slip varnish comprising an adhesive resin and an inorganic filler is a molecule having a higher adhesiveness among adhesive resins such as acrylic copolymers, vinyl ester copolymers and polyurethane resins. The structure is used as a binder resin, and the anti-slip effect is obtained by the adhesive force of the film. Therefore, for example, when an acrylic copolymer is used as a binder resin, a (meth) acrylic acid ester compound having an alkyl group having 6 or less carbon atoms is used as a monomer composition in order to increase the adhesiveness of the copolymer. A copolymer having a glass transition temperature (hereinafter referred to as Tg) of 20 ° C. or less is used as much as possible.

Since the films of these adhesive resins cause blocking if they are left as they are, blocking resistance is obtained by adding wax or an inorganic filler to prevent complete adhesion on the contact surface. . However, with this method, good anti-slip properties, anti-blocking properties, and anti-staining properties cannot be satisfied at the same time.
The blocking tendency becomes remarkable under the environment of high humidity.

On the other hand, according to the present invention, among the acrylic copolymers, by using one having a low adhesive property of the resin itself and having a releasing effect, excellent slip resistance, blocking resistance and stain resistance can be obtained. The anti-slip varnish having contradictory properties is obtained.

(Meth) having 8 to 18 carbon atoms in the alkyl group
An acrylic copolymer obtained by emulsion-polymerizing a monomer component mainly composed of an acrylate compound has a Tg of 20.
Even at a temperature of not higher than 0 ° C., the releasing property is exhibited due to the characteristics of the polymethylene chain, and the tackiness becomes low. Therefore, a sufficient anti-slip effect cannot be obtained as it is.

The Applicant has found that when such an acrylic copolymer is blended with an inorganic filler, it has an excellent anti-slip effect. Furthermore, the weight fraction of the alkyl group portion having 8 to 18 carbon atoms in the acrylic copolymer in the anti-slip varnish,
And by specifying the amount of the inorganic filler against it, has a good anti-slip effect, and blocking resistance,
The present invention has been accomplished by finding that a film having excellent stain resistance can be obtained.

Here, it is not yet clear why slipperiness is exhibited by adding a filler to the resin film having such releasability. However, when the amount of the filler increases, blocking also occurs in the system of the present invention, and therefore it is not considered that the anti-slip effect is simply due to physical interlocking of surface irregularities.

For reference, an attempt will be made below to infer the mechanism of the anti-slip effect of the present invention.

First, the higher the concentration of long-chain alkyl groups, the higher the releasability of the acrylic resin film, and the lower the slip resistance. However, when a filler is added to this system, irregularities are formed on the surface of the resin film, but when a load is applied to this, the irregularities are smoothed out and the air in the depressions is discharged, which is a kind of sucker. It is considered that such an effect is exerted and the anti-slip property is exhibited. On the other hand, since the surface of the resin film inherently exhibits releasability, it is considered that the blocking resistance and the stain resistance are better than those of the conventional adhesive resin having the same anti-slip effect.

The present invention will be described in more detail below.

First, the water-dispersible binder resin (component A) used in the present invention is obtained by emulsion-polymerizing a radical-polymerizable monomer in the presence of an emulsifier. Moreover, as an essential component of this radically polymerizable monomer, the number of carbon atoms is 8 to 1
A water-dispersible binder resin containing at least one kind of (meth) acrylic acid alkyl ester having an alkyl group of 8 and having a polymer Tg of −50 to 20 ° C. relative to the total water-dispersible binder resin is 30. The content is at least wt%. When the alkyl group of the (meth) acrylic acid alkyl ester has less than 8 carbon atoms, the blocking resistance is
Contamination resistance decreases, while if it exceeds 18, slip resistance decreases. If the Tg of the water-dispersible binder resin is higher than 20 ° C, the slip resistance is lowered, while if it is lower than -50 ° C, blocking resistance and stain resistance are lowered. Further, if the content of the water-dispersible binder resin (A component) is less than 30% by weight, a sufficient anti-slip effect cannot be obtained, and when it is used in combination with a water-dispersible resin that is non-film-forming at room temperature, it has an excellent friction resistance. It is not preferable because the properties are deteriorated.

The (meth) acrylic acid alkyl ester having an alkyl group having 8 to 18 carbon atoms is an ester compound of acrylic acid or methacrylic acid and a monoalcohol having an alkyl group having 8 to 18 carbon atoms. And specifically, n-octyl (meth) acrylate,
Examples thereof include 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate and the like. Among them, from the viewpoint of reactivity and the cohesive force of the film of the polymer, the number of carbon atoms of the alkyl group such as n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and lauryl (meth) acrylate is 8 to 12 The (meth) acrylic acid alkyl ester of is more preferably used.

These radically polymerizable monomers are
The Tg of the water-dispersible binder resin may be singly or in the form of a mixture of two or more in the range of -50 to 20 ° C., but it may be further copolymerized with another radically polymerizable monomer to give water. It is also possible to use a dispersible binder resin.

Here, other copolymerizable radically polymerizable monomers are preferably (meth) acrylic acid and maleic acid, and their methyl or ethyl esters, vinyl groups having 8 or less carbon atoms. The aromatic compounds of 9 and the like can be mentioned. Specific examples of the aromatic compound having a vinyl group and having 8 or 9 carbon atoms include styrene, α-chlorostyrene, vinyltoluene and α-methylstyrene.

As a method for producing a water-dispersible binder resin by emulsion polymerization of the above radically polymerizable monomer, a conventionally known method can be used. For example, in addition to using a cationic, anionic or nonionic surfactant alone or in combination as an emulsifier, an acid value of 50 to 3
50 aqueous resin is used as a high molecular emulsifier, and after hydrolyzing with an alkali compound, a method of heating and reacting with radically polymerizable monomer, gradually adding an initiator if necessary, is used. it can.

Further, another water-dispersible binder resin can be used in combination for the purpose of improving the fluidity and film strength of the aqueous coating composition.

That is, at least one kind of (meth) acrylic acid alkyl ester compound having an alkyl group having 8 to 18 carbon atoms is contained as a radically polymerizable monomer, and Tg of the polymer exceeds 20 ° C., or It is also possible to use together a water-dispersible binder resin having a temperature of less than −50 ° C., or a water-dispersible binder resin obtained by polymerizing a radical-polymerizable monomer other than the monomer.

However, in the water-dispersible binder resin according to the present invention, the total amount of the (meth) acrylic acid alkyl ester compound having an alkyl group having 8 to 18 carbon atoms is defined by the following general formula (1). x is 0.07 to
The amount is 0.28, and more preferably 0.12 to 0.18.

X = Σ (k · m · n) (1) (where, k: has an alkyl group having 8 to 18 carbon atoms (meta))
Weight ratio of water-dispersible binder resin (component A) / aqueous coating composition containing an acrylic acid alkyl ester compound as a polymerization component and having Tg of -50 to 20 ° C, m: alkyl having 8 to 18 carbon atoms Have a group (meta)
Acrylic acid alkyl ester compound / weight ratio of all radically polymerizable monomers used for synthesizing A component, n: sum of atomic weight of all atoms constituting an alkyl group having 8 to 18 carbon atoms / 8 carbon atoms Ratio of molecular weight of (meth) acrylic acid alkyl ester compound having 18 alkyl groups, Σ (km · n): For each A component when one or more A components are used is the sum of the products of k, m and n).

If the amount of the (meth) acrylic acid alkyl ester compound having an alkyl group having 8 to 18 carbon atoms is less than the above range, the anti-slip effect of the present invention cannot be obtained.
On the other hand, when the amount is more than the above range, the polymerizability of the copolymer itself is lowered, and the abrasion resistance of the obtained resin film is lowered, which is not preferable.

Next, as the inorganic filler used in the present invention, silica, mica, calcium carbonate, barium sulfate, etc. can be used, and the film of the aqueous coating composition itself becomes colorless by wetting with the water-dispersible binder resin. It is preferably transparent.

The average particle size of the inorganic filler is
1 × 10 ^{−4 to} 5 × 10 ⁻² mm, preferably 1 × 10 ⁻³
Those having a size of up to 1 × 10 ^-2 mm can be used.

Here, the content of the inorganic filler is such that, when the weight ratio of the inorganic filler (component B) / aqueous coating composition is y, y / x = 0.15 with respect to x. ~ 1.2
The amount is 0.

If the content of the inorganic filler is less than the above range, the anti-slip effect of the resulting varnish is reduced, while if it is more than the above range, blocking occurs, and if it is more than the above range, the anti-slip effect is reduced.

The above water-dispersible binder resin and inorganic filler can be used to produce an aqueous coating composition which is the object of the present invention. Furthermore, depending on various uses, it is water-soluble. Acrylic resin, water-soluble styrene-acrylic acid resin, water-soluble styrene-maleic acid resin, water-soluble styrene-acrylic-maleic acid resin, aqueous polyurethane resin, aqueous ethylene-acrylic acid resin, aqueous polyester resin, etc. Aqueous resin, lower alcohols,
Water-miscible solvents such as polyhydric alcohols and their alkyl ethers or esters, leveling agents,
Additives such as defoamers can be added.

In order to produce an aqueous coating composition using the above water-dispersible binder resin, inorganic filler and, if necessary, other materials, the water-dispersible binder resin and other liquid components are stirred. After mixing, a method of adding an inorganic filler with further stirring is used.

Next, the non-slip processing method using the aqueous coating composition obtained in the present invention will be explained.

First, as an object to be coated with the aqueous coating composition of the present invention, which is a surface of a corrugated board, a paper bag or the like, it is possible to apply it to a printing surface on which printing ink is printed.

When the aqueous coating composition of the present invention is applied to corrugated board, it is produced from a front liner such as jute paper, kraft paper, a water repellent liner, various coated papers, a core, and a back liner, It is applied after it becomes a corrugated board sheet.

As a method for applying the aqueous coating composition of the present invention, in addition to a roll coater, a bar coater, etc., a flexo or gravure printing machine is used, and the whole or a part of the article to be coated is used. Can be applied as desired.

A packaging container such as a cardboard or a paper bag manufactured by the above method has excellent anti-slip effect and blocking resistance,
A packaging container having stain resistance.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. In addition, "parts" and "%" represent "parts by weight" and "% by weight" unless otherwise specified.

Production Example 1 of Water-Dispersible Binder Resin In a four-necked flask equipped with an emulsifying machine, a thermometer, a cooling pipe, and a nitrogen gas introducing pipe, 42 parts of water, 1 part of sodium dodecylbenzenesulfonate, and polyoxyethylene nonylphenyl. Charge 2 parts of ether, and while introducing nitrogen gas, 80-85
The temperature was kept at 0 ° C., a mixture of 22 parts of styrene, 33 parts of 2-ethylhexyl acrylate, and 0.3 parts of ditert-butyl oxide was added dropwise over 2 hours, and then 2 more parts were added.
Emulsion polymerization is carried out by reacting for a time, solid content 55%, viscosity 2
Water-dispersible binder resin No. 3 with 3 poise (20 ° C.) and Tg-38 ° C. Got 1.

Production Example 2 of Water-Dispersible Binder Resin The same apparatus and the same synthesis as in Production Example 1 of water-dispersible binder resin except that the monomer composition was changed to 27.5 parts of styrene and 27.5 parts of 2-ethylhexyl acrylate. Emulsion polymerization is performed under the conditions, solid content 55%, viscosity 21 poise (20
C.), Tg-12.degree. C. of water-dispersible binder resin No. Two
Got

Water Dispersible Binder Resin Production Example 3 Monomer composition was 38.5 parts of styrene, acrylic acid-2-
Emulsion polymerization was carried out using the same equipment and the same synthetic conditions as in Water Dispersible Binder Resin Production Example 1 except that ethylhexyl was changed to 16.5 parts to obtain a solid content of 55% and a viscosity of 22 poises (2
0 ° C.), Tg 15 ° C. water-dispersible binder resin No. Three
Got

Production Example 4 of Water-Dispersible Binder Resin Using the same apparatus and production conditions as in Production Example 1 of water-dispersible binder resin, except that the monomer composition was changed to 27.5 parts of styrene and 27.5 parts of lauryl methacrylate. Emulsion polymerization, solid content 55%, viscosity 21 poise (20 ° C), T
Water-dispersible binder resin No. g. Got 4.

Production Example 5 of water-dispersible binder resin Emulsion polymerization was carried out under the same equipment and synthesis conditions as in Production Example 1 of water-dispersible binder resin except that the monomer composition was changed to 25 parts of styrene and 30 parts of stearyl methacrylate. , Solid content 55%, viscosity 21 poise (20 ° C), Tg1
Water dispersible binder resin No. 1 at 1 ° C. Got 5.

Water Dispersible Binder Resin Production Example 6 Monomer composition of styrene 15 parts and methyl methacrylate 2
The same apparatus as in Water Dispersible Binder Resin Production Example 1 except that 5 parts and 15 parts of 2-ethylhexyl acrylate were used,
And emulsion polymerization under the same synthetic conditions, solid content 55%,
Water-dispersible binder resin No. 1 having a viscosity of 23 poise (20 ° C.) and Tg of 27 ° C. Got 6.

Production Example 7 of water-dispersible binder resin Using the same apparatus and production conditions as in Production Example 1 of water-dispersible binder resin, except that the monomer composition was changed to 16.5 parts of styrene and 38.5 parts of ethyl acrylate. Emulsion polymerization, solid content 55%, viscosity 19 poise (20 ° C), Tg5
C. water-dispersible binder resin No. Got 7.

Production Example 8 of water-dispersible binder resin The monomer composition was 16.5 parts of styrene and acrylic acid-n-
Emulsion polymerization was carried out under the same equipment and the same synthesis conditions as in Water Dispersible Binder Resin Production Example 1 except that the butyl content was changed to 38.5 parts, and the solid content was 55%, the viscosity was 21 poise (20 ° C.),
Water-dispersible binder resin No. Got 8.

Water Dispersible Binder Resin Production Example 9 Monomer composition of styrene 25.0 parts, acrylic acid-n-
Emulsion polymerization was carried out under the same equipment and the same synthesis conditions as in Water Dispersible Binder Resin Production Example 1 except that the hexyl content was changed to 30.0 parts, and the solid content was 55% and the viscosity was 20 poise (20
C.), Tg-6.degree. C. of water-dispersible binder resin No. Got 9.

Production Example of Water-Soluble Resin Varnish 60 parts of ethyl acetate was charged into a four-necked flask equipped with a stirrer, a cooling pipe, and a nitrogen gas introducing pipe, and heated to 75 to 78 ° C., while introducing nitrogen gas. , Methacrylic acid 10
Parts, 5 parts of methyl methacrylate, 10 parts of styrene, 15 parts of ethyl acrylate, and 0.4 parts of ditert-butyl peroxide as a reaction initiator were mixed and added dropwise over 2 hours. After polymerizing for 2 hours while maintaining the same temperature, the solvent was evaporated under reduced pressure to obtain an acid value of 162 and Tg.
An aqueous resin having a temperature of 48 ° C. was obtained.

After crushing 40 parts of this aqueous resin, it was mixed by stirring in 60 parts of water in which an equivalent amount of ammonia was dissolved,
The mixture was heated and dissolved at 0 ° C. to obtain a water-soluble resin varnish having a solid content of 40% and a viscosity of 31 poise (20 ° C.).

Examples and Comparative Examples of Aqueous Coating Compositions According to the formulations in Tables 1 and 2, the water-dispersible binder resin and the inorganic filler are mixed with stirring with a high-speed stirrer, and Examples 1 to 10 and Comparative Examples are compared. The aqueous coating compositions of Examples 1-8 were prepared.

Here, as the inorganic filler, Syloid 161 (silica powder, average particle size 5 × 10 ⁻³ mm, Fuji Davison Chemical Co., Ltd.) was used.

Evaluation of Examples and Comparative Examples A K-liner for corrugated board was coated with each of the aqueous coating compositions obtained in Examples 1-10 and Comparative Examples 1-8 at a diameter of 0.
After coating with a 2 mm Mayor bar, the sliding angle and blocking resistance were evaluated. Also, for the K liner for corrugated board,
After coating the water-based printing ink with a 0.2 mm diameter bar, the aqueous coating compositions obtained in Examples 1 to 10 and Comparative Examples 1 to 7 were further coated with a 0.2 mm diameter bar. , Abrasion resistance, stain resistance and transparency were evaluated. The results are shown in Table 3.

Evaluation Test Method and Evaluation Criteria (1) Sliding angle At ambient temperature of 20 ° C. and relative humidity of 60%, TA
The slip angle was measured according to the tilt method test described in PPI. If the sliding angle is 30 ° C. or more, it is within the practical range.

(2) Blocking resistance Under the environmental conditions of an atmospheric temperature of 50 ° C. and a relative humidity of 90%, the coated surfaces of the aqueous coating composition are brought into contact with each other at 5 kg / 25 c.
After applying a load of m ² and leaving it for 24 hours, both were peeled off and the peeling condition was observed. If the evaluation value is A or B, it is within the practical range.

Evaluation Criteria A: Peeling off without any resistance. B: The liner is easily peeled off with a stress enough to bend the liner. C: Peeling off by strongly pulling the contact surface. D: The contact surface is partially damaged during peeling. E: The contact surface is entirely damaged during peeling.

(3) Contamination resistance Under the environmental conditions of an atmospheric temperature of 50 ° C. and a relative humidity of 90%, paper powder of K liner was placed on the coated surface of the aqueous coating composition and left for 1 hour, and the adhesion state was observed. did.

Evaluation criteria A: Paper dust does not adhere. B: Paper powder adheres.

(4) Friction resistance Using a vibration type friction resistance tester, 500 g load, 500
The abrasion resistance was evaluated based on the presence or absence of damage on the coated surface after repeated rubbing. If the evaluation value is A or B, it is within the practical range.

Evaluation criteria A: There is no damage on the coated surface. B: The coated surface has streaky damage. C: The entire coated surface is damaged.

(5) Transparency The transparency was evaluated by observing the underlying ink surface through the coating film of the aqueous coating composition. If the evaluation value is A or B, it is within the practical range.

Evaluation Criteria A: The ink surface shows almost no change as compared with the case without the coating film of the aqueous coating composition. B: Some cloudiness of the coating film of the aqueous coating composition is observed. C: The coating film of the aqueous coating composition is opaque and the ink surface is hidden.

[0073]

[Table 1]

[0074]

[Table 2]

[0075]

[Table 3]

[0076]

As described above in detail with reference to the examples, the aqueous coating composition using the water-dispersible binder resin specified by the present invention and the inorganic filler in a specified ratio has excellent anti-slip properties. It is an aqueous coating composition which is effective and has good blocking resistance, stain resistance and abrasion resistance even under severe environmental conditions of high temperature and high humidity.

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-4-311772 (JP, A) JP-A-3-220088 (JP, A) JP-A-1-261479 (JP, A) JP-A-64- 56711 (JP, A) JP 3-118147 (JP, A) JP 2-129271 (JP, A) JP 1-308748 (JP, A) JP 61-186597 (JP, A) JP-A-5-140898 (JP, A) JP-A-56-133351 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C09D 1/00-13/00 C09D 101/00 -201/10 C08K 3/00-13/08 C08L 1/00-101/16 B29D 9/00 B32B 1/00-35/00 C08C 19/00-19/44 C08F 6/00-246/00 C09J 1 / 00-5/10 C09J 9/00-201/10

Claims (5)

(57) [Claims] 1. An aqueous coating composition mainly composed of a water-dispersible binder resin obtained by emulsion polymerization of a radical-polymerizable monomer in the presence of an emulsifier, an inorganic filler, and water, wherein dispersible binder resin, and inorganic filler, a components: a) having an alkyl group having 8 to 18 carbon atoms (meth) acrylic acid alkyl ester compound, and b) emulsion polymerizing the other radical polymerizable monomer And low adhesion with a glass transition temperature of -50 to 20 ° C
Water-dispersible binder resin having a releasing property with sex, and B component: 1 × containing ^10-4 inorganic filler having an average particle diameter of to 5 × 10 ^-2 mm, and the following conditions 1 and 2 An aqueous coating composition which satisfies the following: Condition 1 Of the total water-dispersible binder resin , A component is 3
0-100 wt% der is, water-dispersible non-A component Vine
The resin content is 70 to 0% by weight . Condition 2 x defined by the following general formula (1), and B
The weight ratio y of the component / aqueous coating composition satisfies x = 0.07 to 0.28 y / x = 0.15 to 1.20. x = Σ (k · m · n) (1) (where, k: weight ratio of A component / aqueous coating composition, m: having an alkyl group having 8 to 18 carbon atoms (meth)
Acrylic acid alkyl ester compound / weight ratio of all radically polymerizable monomers used for synthesizing A component, n: sum of atomic weight of all atoms constituting an alkyl group having 8 to 18 carbon atoms / 8 carbon atoms Ratio of molecular weight of (meth) acrylic acid alkyl ester compound having 18 alkyl groups, Σ (km · n): For each A component when one or more A components are used is the sum of the products of k, m and n). 2. The carbon number as a) of component A is 8-12.
The aqueous coating composition according to claim 1, wherein the (meth) acrylic acid alkyl ester compound having an alkyl group is used. 3. Other radicals as component b))
The polymerizable monomers are (meth) acrylic acid, maleic acid,
Their methyl or ethyl esters, and
From aromatic compounds having 8 or 9 carbon atoms having a nyl group
The composition according to claim 1 or 2, which is selected from the group consisting of
Aqueous coating composition. 4. The aqueous coating composition according to claim 1, wherein x is 0.12 to 0.18. 5. A package comprising a paper container, a paper bag or a sheet material thereof coated with the aqueous coating composition according to claim 1, 2 , 3 or 4 to form an anti-slip coating layer. How to process containers.