JP2001254296A - Resin composition for moisture-proofing treatment and moisture-proofing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for moisture-proofing treatment capable of imparting high moisture-proofness (JIS Z-0208) comparable to a polyethylene- laminated paper, having high separability of the resin layer from paper in regeneration, exhibiting good blocking resistance and antislippery property and resistant to the falling off of wax. SOLUTION: The objective resin composition for moisture-proofing treatment contains (1) a synthetic resin emulsion or a synthetic rubber latex containing 1-40 pts.wt. of a monomer containing acid group, (2) a paraffin wax having a melting point of 45-70 deg.C and (3) aluminum hydroxide having an average particle diameter of 1-50 μm. The amount of the paraffin wax (2) is 0.3-150 pts.wt. based on 100 pts.wt. (solid basis) of the synthetic resin emulsion or the synthetic rubber latex (1). The invention also relates to a moisture-proofing material composed of the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition for moisture-proof processing, and more particularly to a resin composition for moisture-proof processing for forming a moisture-proof layer by coating or impregnating paper or nonwoven fabric. About things,
In particular, it is a moisture-proof and waterproof composition from which waste paper and waste paper can be easily collected, and is particularly applied to the field of wrapping paper.

[0002]

2. Description of the Related Art Conventionally, as a moisture-proof paper, there are a moisture-proof coat paper in which a base paper is coated with a vinylidene chloride resin and a polyethylene laminate paper. These moisture-proof papers are applied in the field of wrapping paper because of their good moisture-proof performance.

In recent years, from the viewpoint of effective use of resources and countermeasures against pollution, there is a problem as to whether it is easy to recycle waste paper or waste paper when recovering waste paper or waste paper. From this point of view, in the case of polyethylene laminated paper, separation of the resin layer from the paper (disintegration)
However, there is a problem that it is difficult to recycle even if the waste paper and the waste paper are collected. Further, when a vinylidene chloride resin is applied, the generation of toxic gas of halogen when incinerating the coated paper has recently become an environmental problem.

[0004] As described above, all moisture-proof papers have problems, and the development of alternative moisture-proof papers is strongly demanded.

[0005] As an alternative technique, a technique of obtaining a moisture-proof paper by mixing and coating 5-200 parts by weight of a wax with 100 parts by weight of a butadiene-based latex is disclosed in
No. 2259 has been proposed. However, in this technique, the coated surface is slippery because wax is used, and even if an anti-slip agent or the like is used, slip resistance is not satisfied. In addition, the moisture-proof performance is rather deteriorated due to the falling off of the wax due to the wear of the coated surface. Further, problems such as blocking of the coated paper occur due to the pressure at the time of winding the coated paper. As an alternative technique, a technique has been proposed in which wax is blended with an acrylic emulsion and applied to a cardboard to produce a moisture-proof paper (Japanese Patent Publication No. 2-1671). However, the moisture-proof paper obtained by this technique has satisfactory slip resistance, but is inferior to the vinylidene chloride resin coated paper and the polyethylene laminated paper.

Further, there is a technique using a wax emulsion containing a paraffin wax, an esterified product of a specific maleated or fumarated rosin and a polyhydric alcohol, and polybutene as a moisture-proof composition (Japanese Patent Publication No. Hei.
-10759 publication). However, the moisture-proof paper obtained by applying this moisture-proof composition to a substrate has a problem that wax is dropped off due to abrasion of the coated surface, and the moisture-proof property is reduced.

Further, in a moisture-proof paper having a moisture-proof layer containing a wax and a synthetic resin latex formed on at least one surface of a paper support, the moisture-proof layer has an aspect ratio of 5 or more and a particle size of 5 to 50 μm. Containing a pigment and n
A paraffin component ratio of 0.5 to 5.0 relative to the entire moisture-proof layer;
There is a technology relating to moisture-proof paper (Japanese Patent Application Laid-Open No. 9-111696), which is a weight percent. However, this technique is based on the pigment dispersibility when producing the composition,
It is difficult to reduce the viscosity, and there is a problem in coating suitability with a coating machine that requires a low viscosity. In addition, there is a problem in that satisfactory performance cannot be obtained in terms of gloss (whiteness) and friction coefficient of the coated paper.

Therefore, at present, the paper industry and processing agent manufacturers can provide moisture-proofing properties comparable to polyethylene-laminated paper, and also provide an emulsion-based moisture-proofing resin composition capable of recovering waste paper and waste paper. The development of is desired.

[0009]

DISCLOSURE OF THE INVENTION The present invention relates to a high moisture-proof property (JIS Z-020) comparable to that of polyethylene laminated paper.
8) The object of the present invention is to provide a resin composition for moisture-proof processing, which has a good disintegration property between the resin layer and the paper at the time of reproduction, a good anti-blocking property, a good anti-slipping property, and no falling off of wax. It is assumed that.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have found that a synthetic resin emulsion or a synthetic rubber latex having a specific acid group, a paraffin wax emulsion and aluminum hydroxide are used. By coating a resin composition using a composition blended at a specific ratio on paper, polyethylene laminating
The present inventors have found that a material exhibiting high moisture-proofing performance comparable to that of the above, and which can easily recover waste paper and waste paper and have excellent blocking resistance can be obtained, and have completed the present invention.

That is, [I] The present invention relates to a synthetic resin emulsion or a synthetic rubber latex (1) in which the amount of an acid group-containing monomer is 1 to 40 parts by weight, and a paraffin wax having a melting point of 45 ° C. to 70 ° C. 2) and aluminum hydroxide (3) having an average particle diameter of 1 to 50 μm, and the paraffin wax (2) is 100 parts by weight of the synthetic resin emulsion or synthetic rubber latex (1) in terms of solid content. To provide a resin composition for moisture-proof processing characterized by being 0.3 to 150 parts by weight with respect to

[II] The synthetic resin emulsion of the present invention or the synthetic rubber latex (1) contains an acid group-containing monomer,
(M) provides a resin composition for moisture-proof processing according to the above [I], which is acrylic acid or itaconic acid,

[III] The Tg of the synthetic resin emulsion or synthetic rubber latex (1) of the present invention is -39 to -39.
It is intended to provide the moisture-proof resin composition according to the above [I] or [II], which has a temperature of 40 ° C.

[IV] The present invention also provides a moisture-proof resin composition according to the above [I] to [III], wherein the paraffin wax (2) contains 90% by weight or more of normal paraffin wax. ,

[V] The present invention further relates to aluminum hydroxide (3) in an amount of 5 to 25 parts by weight per 100 parts by weight of synthetic resin emulsion or synthetic rubber latex (1) in terms of solid content.
[VI] The present invention provides a resin composition for moisture-proof processing according to any one of the above [I] to [V], which is 0 parts by weight. 10 to 50 g /
The present invention provides a moisture-proof material coated with a thickness of m ² .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The synthetic resin emulsion or synthetic rubber latex of the present invention needs to contain 1 to 40 parts by weight of an acid group-containing monomer. If the amount is less than 1 part by weight, it is difficult to obtain satisfactory performance in terms of blocking resistance and disintegration. On the other hand, if it exceeds 40 parts by weight, the film-forming properties are poor and the moisture-proof properties are not preferred. The amount of the acid group excellent in the disintegration property and the blocking resistance of the synthetic resin emulsion or the synthetic rubber latex is preferably from 10 to 40 parts by weight.

The Tg of the synthetic resin emulsion or the synthetic rubber latex is not particularly limited, but is -3.
It is preferably from 9C to 40C. If the Tg is lower than -39 ° C, it is not preferable in terms of blocking resistance and moisture resistance. On the other hand, if the Tg exceeds 40 ° C., the film-forming properties are poor, and the moisture resistance is not preferred.

The paraffin wax of the present invention is a crystalline paraffin separated and refined from petroleum. There are mainly structures of normal paraffin, isoparaffin, cycloparaffin and the like.
It is preferable in terms of moisture resistance that the content is 0% by weight or more and the content of isoparaffin and cycloparaffin is 10% by weight or less. Although the number of carbon atoms is not particularly limited, it is 20 to 35.
Are preferred. The melting point usually varies in the range of 40 to 70 ° C., but it is necessary to be 45 to 70 ° C. in order to maintain the moisture-proof property which is the object of the present invention. If the temperature is lower than 45 ° C., the composition of the present invention is applied to a substrate and does not exhibit moisture-proof properties in a drying step after application to the substrate. Is not exhibited. Further, the molecular weight is not particularly limited, but is preferably from 330 to 480 in terms of number average molecular weight in order to exhibit moisture-proof properties. The amount of the paraffin wax used must be 0.3 to 150 parts by weight. If it is less than 0.3% by weight, the desired moisture-proof performance cannot be obtained, and if it exceeds 150 parts by weight, it is not preferable in terms of slip resistance. Examples of the form of the paraffin wax include a solid form and an emulsion form in which the solid form is emulsified and dispersed, and any form can be used. Is preferred.

At the time of emulsification and dispersion, an emulsifier can be used. As the emulsifier, commercially available anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, and the like can be used.
Commercial products of paraffin wax include, for example, 11
5, 120, 125, 130, 135, 140, 15
0, EMUSTER0135, 0136, 0384,
[Nippon Seiro Co., Ltd.].

An essential component of the present invention used in combination with the paraffin wax is aluminum hydroxide. The average particle size of aluminum hydroxide is 1 μm to 50 μm, and preferably 3 μm to 30 μm.
When the particle diameter is less than 1 μm, it is not preferable in terms of blocking resistance, and when it exceeds 50 μm, it is not preferable in terms of film forming property, moisture permeability and surface condition.

According to the present invention, by using paraffin wax and aluminum hydroxide in combination, a moisture-proof material produced by applying the paraffin wax to a substrate and satisfying both moisture permeability, film forming property and slip resistance can be obtained.

The amount of aluminum hydroxide used is preferably from 5 to 250 parts by weight per 100 parts by weight of the solid content of the synthetic resin emulsion or synthetic rubber latex.
If the amount of aluminum hydroxide is less than 5 parts by weight, it is not preferable in terms of blocking resistance, and if it exceeds 250 parts by weight, it is not preferable in forming a film. More preferably, 10 to 15
0 parts by weight.

The synthetic rubber latex or the synthetic resin emulsion is produced as a copolymer by combining the following ethylenically unsaturated monomers with a monomer or a plurality thereof. Examples of the ethylenically unsaturated monomers include, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl metal acrylate, hexyl acrylate, methacrylic acid Alkyl acrylates and alkyl methacrylates exemplified by hexyl, heptyl acrylate, heptyl methacrylate, octyl acrylate, octyl methacrylate, octadecyl acrylate, octadecyl methacrylate, etc .; 1,2 butadiene, 1,3 butadiene Conjugated diene monomers such as styrene, isoprene and chloroprene; ethylenically unsaturated aromatic monomers represented by styrene, α-methylstyrene, vinyltoluene, chlorostyrene 2,4-dibromostyrene and the like; Rironitoriru, unsaturated nitriles such as methacrolein carbonitrile;

Acrylic acid, methacrylic acid, crotonic acid,
Maleic acid and its anhydride, fumaric acid, itaconic acid, and unsaturated dicarboxylic acid monoalkyl esters, for example, ethylenically unsaturated carboxylic acids such as monomethyl maleate, monoethyl fumarate, and mono-n-butyl itaconate; vinyl acetate, propion Vinyl esters such as vinyl acid; vinylidene chloride such as vinylidene chloride and vinylidene halide; ethylenic compounds such as 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 2-hydroxyethyl methacrylate; Hydroxyalkyl esters of unsaturated carboxylic acids; glycidyl esters of ethylenically unsaturated carboxylic acids such as glycidyl acrylate and glycidyl methacrylate, and acrylamide, methacrylamide, N-methylolacrylamide, N-methylo Le methacrylamide, N- butoxymethyl acrylamide, radical-polymerizable monomers such as diacetone acryl bromide and the like.

The synthetic rubber latex or the synthetic resin emulsion used in the present invention can be obtained by emulsion polymerization of the above ethylenically unsaturated monomer. As the emulsifier used at this time, commercially available anionic surfactants, nonionic surfactants, cationic surfactants,
Zwitterionic surfactants and the like can be used. Of these, it is preferable to use a reactive emulsifier in order to further enhance the moisture resistance. By using this reactive emulsifier, a soap-free emulsion can be obtained. As the reactive emulsifier, for example, sodium styrenesulfonate, sodium vinylsulfonate, sodium sulfonate-
And emulsifiers having various ethylenically unsaturated groups. Among these, Japanese Patent Application Laid-Open No. 58-20396
The compound having the following structural formula shown in Japanese Patent Publication No. 0 is most preferred.

Embedded image (In the formula, R represents an alkyl group having 12 carbon atoms or an alkyl group having 18 carbon atoms in which one of the hydrogen atoms has been replaced with a fluorine atom, and M represents Na or NH _4. ) Also, use an emulsifier. In addition, the resin of synthetic rubber latex or synthetic resin emulsion contains anionic groups such as carboxyl groups, cationic groups such as quaternary ammonium bases, and nonionic functional groups such as ethylene oxide chains. An emulsified soap-free emulsion can also be used. Further, it is preferable that the ionicity and the nonionicity of the emulsifier are matched from the viewpoint of compatibility with the wax emulsion. For example, if an anionic surfactant is used in the wax emulsion, the synthetic resin emulsion preferably uses an anionic surfactant.

The amount of the emulsifier used is 100 in terms of solid content of a synthetic rubber latex or a synthetic resin emulsion.
It is preferable to use 0.1 to 3 parts by weight based on parts by weight. Even when a synthetic rubber latex or a synthetic resin emulsion using an emulsifier in an amount exceeding 3 parts by weight is used in combination with the aluminum hydroxide of the present invention, it becomes difficult to exhibit high moisture resistance.

The synthetic rubber latex of the present invention requires styrene-butadiene rubber (SB
R), methyl methacrylate butadiene rubber (MBR)
Are preferred.

Further, the synthetic resin emulsion of the present invention comprises:
The above ethylenically unsaturated monomer is emulsion-polymerized. In order to obtain high moisture-proof performance, it is preferable to use 2-ethylhexyl acrylate among these ethylenically unsaturated monomers. .

In producing the synthetic rubber latex or the synthetic resin emulsion of the present invention, the above-mentioned monomer mixture is heated to 40 ° C. in the presence of a free radical generating catalyst.
The polymerization may be performed at 80 ° C. Examples of the free radical generating catalyst include aqueous catalysts such as potassium persulfate (K ₂ S ₂ O ₈ ), ammonium persulfate [(NH ₄ ) ₂ S ₂ O ₈ ], hydrogen peroxide, tert-butylhydroxide, cumene hydroperoxide and the like. Oily catalysts such as oxides;

Additives usually used for radical polymerization, for example, a chain transfer agent, ethylenediaminetetraacetic acid, pH
An alkali substance for adjustment can be used if necessary.

The synthetic rubber latex or synthetic resin emulsion of the present invention is preferably used after being concentrated to a required solid content by a method such as stripping to reduce the odor of unreacted monomers.

The minimum film forming temperature (MFT) of the synthetic rubber latex or the synthetic resin emulsion is not particularly limited, but is preferably 50 ° C. or lower in view of the film forming property.

As a method of combining a mixture of paraffin wax and aluminum hydroxide, a synthetic rubber latex or a synthetic resin emulsion, the mixture may be mixed with the synthetic rubber latex or the synthetic resin emulsion, or the presence of the mixture. Emulsion polymerization of a synthetic rubber latex or a monomer mixture for a synthetic resin emulsion may be carried out below.

The resin composition for moisture-proof processing of the present invention may further comprise, if necessary, a surfactant,
Polyhydric alcohols, inorganic substances other than aluminum hydroxide, thickeners and the like can be added.

The surfactant and the polyhydric alcohol are used for improving the disintegration when the coated paper is regenerated. As the surfactant, for example, commercially available products such as Emulgen 105, 108, 109P, 120, 1
23P, 705, 707, 709, Emal, Emal 2F, Neoperex F25 (manufactured by Kao Corporation), Neugen EA-80, 120, 140, 142, 160, 17
0, 190D, Neocoll YSK, P [Daiichi Kogyo Seiyaku Co., Ltd.] and the like.

The polyhydric alcohols include ethylene glycol, diethylene glycol, and propylene glycol.
, Polyethylene glycol, polypropylene glycol and the like.

Examples of inorganic substances other than aluminum hydroxide include calcium carbonate, talc, kaolin, titanium oxide, zinc oxide, silica and the like.

Examples of the thickener include polyvinyl alcohol, sodium polyacrylate and ammonium salts, and polyethylene thickeners.

By applying or impregnating the substrate with the resin composition for moisture-proof processing of the present invention, a moisture-proof material such as moisture-proof paper can be obtained.

Examples of the substrate include paper, paperboard, nonwoven fabric, fiber substrate, and wood. As a method of applying or impregnating the base material, various processing methods such as coating with various coaters, impregnation with an impregnating machine, and processing with a size press can be used. The coating amount on the base material is preferably such that the coating amount is as low as 10 to 50 g / m ² from the viewpoint of cost and recovery of waste paper and waste paper. If it is less than 10 g / m ^2, it is difficult to exhibit high moisture resistance, and if it exceeds 50 g / m ² , the drying property will be slow. A more preferred coating amount is 20 to 30 g / m ² .

[0041]

The present invention will be described below with reference to Synthesis Examples and Examples. All parts and percentages in the examples are based on weight.

Synthesis Example 1 In a pressure-resistant polymerization vessel equipped with a stirrer, 120 parts of water, 0.1 part of sodium hydroxide, and 0.5 part of a reactive emulsifier S-180 [unsaturated alkyl sulfate, manufactured by Kao Corporation] were added. Part, 0.1 part of ethylenediaminetetraacetic acid, 30 parts of styrene, butadiene 25
Parts, methyl methacrylate 40 parts, acrylic acid 5.0,
0.1 part of t-dodecyl mercaptan was charged, stirring was started, and the reaction temperature was raised to 60 ° C.
When the temperature was reached, 0.1 part of ammonium persulfate was added to start the reaction. After 7 hours, cooling was performed when the conversion reached 98%. The obtained latex had a polymerization rate of 98.6%. Then, the pH of the latex was adjusted to 8.0 with 25% aqueous ammonia, and then the content of the emulsifier was adjusted to 10.1% or less by a steam distillation to obtain a solid content of 50.1%.
(Hereinafter referred to as LX-1).

Synthesis Example 2 In a pressure-resistant polymerization vessel equipped with a stirrer, 120 parts of water, 0.1 part of sodium hydroxide, and an emulsifier Neoperex F-25 [sodium salt of alkylbenzenesulfonic acid, manufactured by Kao Corporation] were added in an amount of 0 parts. 0.5 parts, ethylenediaminetetraacetic acid 0.1 part, styrene 30 parts, butadiene 25 parts, methyl methacrylate 40
Part, acrylic acid 5.0, t-dodecyl mercaptan 0.
One part was charged, stirring was started, the reaction temperature was raised to 60 ° C., and when the temperature in the polymerization vessel reached 60 ° C., 0.1 part of ammonium persulfate was added to start the reaction. After 7 hours, cooling was performed when the conversion reached 98%. The obtained latex had a polymerization rate of 98.6%. Next, the pH of the latex was adjusted to 8.0 with 25% aqueous ammonia, and then the content of the emulsifier was reduced to 1 by steam distillation.
% Or less SBR latex having a solid content of 50.1% [hereinafter L
X-2)].

Synthesis Example 3 In a pressure-resistant polymerization vessel equipped with a stirrer, 120 parts of water, 0.1 part of sodium hydroxide in an amount shown in Table 1 of paraffin wax (softening point: 60 ° C.), reactive emulsifier S-180 [ 0.5 parts, 0.1 part of ethylenediaminetetraacetic acid, 30 parts of styrene, 25 parts of butadiene, 40 parts of methyl methacrylate, and 5.0 parts of acrylic acid. , 0.1 part of t-dodecylmercaptan was charged and stirring was started. When the temperature in the polymerization vessel at which the reaction temperature was raised to 60 ° C reached 60 ° C, 0.1 part of ammonium persulfate was added to start the reaction. I let it. After 7 hours, cooling was performed when the conversion reached 98%. The obtained latex had a polymerization rate of 98.6%. Then, the pH of the latex was adjusted to 8.0 with 25% aqueous ammonia, followed by steam distillation. When the emulsifier content was 1% or less, the solids containing the ester compound were 49.9% and 50%, respectively. .1% SBR latex (hereinafter referred to as LX-)
I got

Synthesis Examples 4 to 8 and Comparative Synthesis Examples 1 and 2 In the same synthesis method as in Synthesis Example 1, the monomer composition was changed and S
BR latex LX-4) to 8) and LX-9), LX-10)
I got

[Table 1] (Note) 2EHA; 2ethylhexyl acrylate St; styrene MMA; methyl methacrylate MAA; methacrylic acid AA; acrylic acid IA; itaconic acid

Synthesis Example 9 In a polymerization vessel equipped with a stirrer, 120 parts of water, 0.1 part of sodium hydroxide, and 0.5 part of a reactive emulsifier S-180 (unsaturated alkyl sulfate, manufactured by Kao Corporation) were added. , 0.1 part of ethylenediaminetetraacetic acid, 30 parts of styrene, 25 parts of 2ethylhexyl acrylate, 40 parts of methyl methacrylate, 5.0 parts of acrylic acid, and 0.1 part of t-dodecyl mercaptan, and stirring was started. When the temperature in the polymerization vessel reached 70 ° C., 0.1 part of ammonium persulfate was added to start the reaction. After 7 hours, when the polymerization rate reached 98%, cooling was performed. The obtained emulsion had a polymerization rate of 98.6%. Then 2
The pH of the emulsion is adjusted to 7.5 with 5% aqueous ammonia, and thereafter, a copolymer synthetic resin emulsion (hereinafter referred to as EM-) having a solid content of 50.0% and an emulsifier content of 1% or less is obtained by steam distillation. Was.

Synthesis Examples 10 to 16 and Comparative Synthesis Examples 3 and 4 Copolymer synthetic resin emulsions EM-2) to 9) and EM-1 were prepared in the same manner as in Synthesis Example 9 except that the monomer composition was changed.
0) and EM-11) were obtained.

[Table 2]

[Table 3]

Examples 1 to 18 Paraffin wax (softening point: 60 ° C.) and aluminum hydroxide (average particle size: 1) were placed in a pressure-resistant polymerization vessel equipped with a stirrer.
μm to 50 μm), LX-1) to LX-8) and EM-
1) to EM-9) were blended as shown in Tables 4 and 5, respectively.

Paraffin wax and aluminum hydroxide were blended as shown in Tables 5 and 5 to obtain a moisture-proof composition of the present invention.

[0050]

[Table 4] (Note) P-wax Paraffin wax (melting point, 60 ° C) Nippon Seiro Co., Ltd. Aluminum hydroxide B703 (average particle size 2 μm) Nippon Light Metal Co., Ltd. 〃 B103 (〃8 μm) Ｂ B303 (〃30 μm) ＢB53 ( ５０ 50μm)

[0051]

[Table 5] (Note) P-wax Paraffin wax (melting point, 60 ° C) Nippon Seiro Co., Ltd. Aluminum hydroxide B703 (average particle diameter 2 μm) Nippon Light Metal Co., Ltd. Ｂ B103 (〃8 μm) Ｂ B303 (〃30 μm) Ｂ B53 ( (〃50 μm) Comparative Examples 1 to 16 Paraffin wax, aluminum hydroxide, mica and the like were blended as shown in Tables 6 and 7 to obtain a moisture-proof composition.

[0052]

[Table 6] (Note) P-wax Paraffin wax (melting point, 60 ° C) P-wax 〃 (〃80 ° C) Aluminum hydroxide B103 (particle diameter 8μm) 〃 B73 (〃80μm)

[0053]

[Table 7] (Note) P-wax Paraffin wax (melting point, 60 ° C.) P-wax 〃 (８０ 80 ° C.) Aluminum hydroxide B103 (particle size 8 μm) 〃 B73 (〃 80 μm) Application Examples 1 to 18 Synthesis obtained in Synthesis Examples Using a rubber latex and a synthetic resin emulsion, the moisture-proofing compositions of Examples 1 to 9 were applied to a commercially available high-quality paper (basis weight 70 m ² ) at a coating amount of about 25 g / m ² using a Myer lot. The coated paper was dried at 120 ° C. for 1 minute using a hot air drier to process a moisture-proof coated paper. Tables 8 and 9 show the measurement results.

[0054]

[Table 8]

[0055]

[Table 9]

Comparative Application Examples 1 to 16 Using the synthetic rubber latex or the synthetic resin emulsion obtained in the synthesis example and paraffin wax, the compositions of comparative examples 1 to 8 were converted to commercially available high-quality paper (basis weight 70 g / m 2). ² )
Was applied at a coating amount of about 25 g / m ² by a Myer lot and dried in a hot air drier at 120 ° C. for 1 minute. As Comparative Example 8, a commercially available polyethylene laminated paper was used for comparison. The coated paper thus obtained was measured for coating amount and moisture permeability (cup method at 40 ° C. and 90% humidity under constant temperature and humidity conditions) according to JISZ0208 by the following test methods. Tables 10 and 11 show the measurement results.

[0057]

[Table 10]

[0058]

[Table 11]

From Table 10, the moisture-proof values of the synthetic rubber latexes or the synthetic resin emulsions of Comparative Examples 1 to 7 are all higher than those obtained in Examples 1 to 9, and polyethylene laminate paper in terms of moisture-proof properties. It cannot be seen as a substitute for moisture-proof paper.

The physical properties in Tables 10 and 11 were measured and evaluated according to the following test methods. <Measurement Method and Evaluation Criteria> Moisture permeability (g / m ² , 24 hr): 40 ° C., 9 under constant temperature and humidity conditions according to JIS 0208
It was measured by the cup method at 0% RH. Moisture permeability after abrasion (g / m ² , 24 hr): The coated and uncoated surfaces of the moisture-proof coated paper are put together, a load of 10 kg is applied, and the paper is shaken to the right and left for 2 minutes using a shaker. After abrasion, the moisture permeability was measured according to JIS 0208. Friction coefficient; friction coefficient test method Measured according to JIS-P8147 (horizontal method).

Disintegration; 535 in home mixer pot
0.8 ml of 25% sodium hydroxide in 40 ml of warm water
In addition, 1 g of coated paper cut into a 3 cm square was added, and defibration was performed for 3 minutes, and the disintegration between the resin and the paper was visually determined. ○: Disintegration, △: Partially disintegrating, ×: No disintegration Blocking property: At a press temperature of 40 ° C. of a small press machine, the coated surface of coated paper 10 × 10 cm and black paper were combined, and the press pressure was 10 kg / Pressing was performed at 15 cm ² for 15 minutes, and the state of the transfer to the black paper coated surface was visually determined. ：: no blocking, △: slightly blocking,
×: With blocking

Gloss (whiteness): JIS-P8138
(Paper opacity test method). Pigment dispersibility: The moisture-proof processing composition was applied on a glass plate with an applicator (bar coater), and the dispersion state of the pigment was visually determined. ：: Uniform dispersion △: Uniform but insufficient dispersion
X: Lumped and not dispersed Surface condition: A colored solvent was applied to the coated surface of the coated paper, and whether the solvent had penetrated the back surface of the coated paper was determined by finger touch and visual observation. ：: Not penetrated △: Slight bleeding
×: Complete penetration

[0063]

The moisture-proof material, especially the moisture-proof paper, using the composition for moisture-proof processing of the present invention has excellent moisture-proof performance as compared with the conventional moisture-proof coated paper using a polymer, and has a wax after abrasion. And the moisture-proof performance is extremely low. Further, it is easy to repulp the coated paper. Furthermore, it is extremely excellent in coefficient of friction and blocking resistance, and is very useful as moisture-proof paper.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) D06M 13/02 D06M 15/693 15/693 D21H 19/38 D21H 19/38 19/58 19/58 C08L 21/00 / / C08L 21/00 D06M 11/14 F term (reference) 4J002 AC021 AC061 AC091 AE032 BB032 BC031 BC081 BC111 BD101 BD111 BF011 BF021 BG011 BG041 BG051 BG061 BG071 BG121 BG131 B04001 CD011 CH041 CJ011 GA06 HA166 KA08 MA08 MA10 MA13 NA08 NA11 NA27 PA18 PB04 PC10 4L031 BA11 DA00 4L033 AC15 BA01 CA18 CA68 CA70 DA07 4L055 AG17 AG51 AG63 AG72 AG76 AG97 AH02 AH23 AH37 AJ04 BE08 EA16 EA20 EA29 GA29

Claims (6)

[Claims] 1. A synthetic resin emulsion or synthetic rubber latex (1) having an amount of an acid group-containing monomer of 1 to 40 parts by weight, a paraffin wax (2) having a melting point of 45 to 70 ° C., and an average particle diameter of 1 to 50 μm of aluminum hydroxide (3), and the paraffin wax (2) is used in an amount of 0.3 to 100 parts by weight of the synthetic resin emulsion or synthetic rubber latex (1) in terms of solid content.
A moisture-proof resin composition comprising 150 parts by weight. 2. The resin composition for moisture-proof processing according to claim 1, wherein the acid group-containing monomer of the synthetic resin emulsion or the synthetic rubber latex is (meth) acrylic acid or itaconic acid. 3. The resin of the synthetic resin emulsion or synthetic rubber latex has a Tg of -39 ° C. to 40 ° C.
Or the resin composition for moisture-proof processing according to claim 2. 4. The resin composition according to claim 1, wherein the paraffin wax (2) contains 90% by weight or more of normal paraffin wax. 5. The moisture-proofing process according to claim 1, wherein the aluminum hydroxide (3) is used in an amount of 5 to 250 parts by weight per 100 parts by weight of the synthetic resin emulsion or synthetic rubber latex (1) in terms of solid content. Resin composition. 6. A moisture-proof material obtained by applying the moisture-proof resin composition according to any one of claims 1 to 5 to a substrate at a thickness of 10 to 50 g / m ² .