JP3481359B2 - Moisture proof paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moisture-proof paper.
is there. More specifically, the present invention has excellent moisture-proof properties,
It does not generate a king and can be recovered as used paper
The present invention relates to a novel moisture-proof paper. [0002] 2. Description of the Related Art Conventionally, synthetic rubber and wax are contained.
A moisture-proof paper having a moisture-proof layer is known (Japanese Patent Publication No. Sho 5
5-22597 gazette). Such moisture-proof paper is made of synthetic rubber.
Water-based blending of Tex and wax emulsion
Applying the emulsion composition to the base paper surface and drying
Is obtained by As this synthetic rubber latex,
Generally, sodium lauryl sulfate and sodium dodecyl sulfate
Emulsion polymerization in the presence of a low molecular weight emulsifier such as
And the polymer latex obtained by
Was. However, using such a polymer latex
The moisture-proof paper that is obtained by
Kings may occur, or the contents and moisture-proof paper may block during packaging.
There were problems such as kings. Also, blockin
If the polymer latex Tg is increased to avoid
Poor moisture resistance, especially when folded paper
There was also the problem of doing. On the other hand, recently, resource saving, environmental pollution and industrial
Hazardous gas is generated during incineration to reduce waste.
There is a strong need for non-polluting, moisture-proof paper that can collect used paper.
Is required. What can be collected as used paper is the paper layer
The pulp forming the fibers is sufficiently disintegrated into single fibers.
You. Polyethylene and polypropylene
Olefin polymers such as ethylene, vinyl chloride and vinyl chloride
Chlorine-containing copolymer obtained using den etc. as a comonomer
Moisture proof paper obtained by coating high molecular compounds such as on base paper
Pulp does not sufficiently disintegrate into single fibers and
In the recovered paper stock as it is, or small pieces of film remain
Or a major obstacle to the recovery and recycling of used paper
Was. [0004] SUMMARY OF THE INVENTION It is an object of the present invention to provide a moisture-proof
Excellent in properties, no blocking, and used paper
Moisture proof so as not to cause the above problems in recovery and recycling
The purpose of the present invention is to provide a functional paper. We have achieved this goal.
As a result of intensive research to achieve this, alkali-soluble polymerization
Synthesis obtained by emulsion polymerization in the presence of neutralized products
Compounding rubber latex and wax-based emulsion
The aqueous emulsion composition consisting of
The above-mentioned object can be achieved by
Based on the above, the present invention has been completed. [0005] According to the present invention, there is provided:
For example, synthetic rubber latex and wax-based emulsion
Aqueous emulsion composition is applied on base paper
Having a moisture-proof layer formed by drying and drying
Synthetic rubber latex is alkali soluble in wet paper
Neutralized polymer5-100 parts by weightConjugated diene in the presence of
Compound20-60% by weightAnd other copolymerizable with it
Compound of40-80% by weightA monomer consisting of100 parts by weight
Rubber latex obtained by emulsion polymerization of
Moisture-proof paper, characterized in that it is made of paper. The moisture-proof paper of the present invention has a moisture-proof layer on the base paper.
The moisture-proof layer is made of synthetic rubber latex and wax.
Aqueous Emulsion Combined with Water-based Emulsion
It is formed by coating the product on base paper and drying
Things. In the present invention, synthetic rubber latex is used.
Conjugated die in the presence of a neutralized product of an alkali-soluble polymer.
Compounds and other compounds copolymerizable therewith.
Used by emulsion polymerization of monomers
It is characterized by being. As the conjugated diene compound,
1,3-butadiene, isoprene, 2,3-dimethyl-
Examples include 1,3-butadiene and 1,3-pentadiene.
Of these, 1,3-butadiene is preferred.
No. Other copolymerizable with conjugated diene compounds
Compounds include styrene, α-methylstyrene, vinyl
Toluene, pt-butylstyrene, chlorostyrene
Aromatic vinyl compounds such as; meth (meth) acrylate
, Ethyl (meth) acrylate, acrylic acid (meth) acrylate
Ropyl, n-amyl (meth) acrylate, (meth) acyl
Isoamyl acrylate, n-hexyl (meth) acrylate,
2-ethylhexyl (meth) acrylate, (meth) acryl
N-octyl acrylate, 2-hydroxy (meth) acrylate
Siethyl, hydroxypropyl (meth) acrylate, etc.
(Meth) acrylic acid ester; (meth) acrylonite
Cyano group-containing ethylenically unsaturated compounds such as ril;
Etch such as glycidyl acrylate and glycidyl methacrylate
Glycidyl esters of lenic unsaturated acids; allyl glycidyl
Glycidyl ethers of unsaturated alcohols such as
(Meth) acrylamide, N-methylol (meth)
Acrylamide, N-butoxymethyl (meth) acryl
Examples are (meth) acrylamide compounds such as amides
Shown. Use only one or two of the above compounds.
Can be. Of these, aromatic vinyl compounds are preferred.
Good. The composition ratio of each component in the monomer is appropriately selected.
Usually, 20 to 60% by weight of a conjugated diene compound,
Preferably 25 to 50% by weight, with the conjugated diene compound
40-80% by weight of the other compound which can be combined, preferably
50 to 75% by weight. [0009] The neutralized product of the alkali-soluble polymer is
Neutralization degree of the re-soluble polymer with alkali is 70% or more.
Or 90% or more. alkali
Soluble polymers include ethylenically unsaturated carboxylic acids and
Polymerizes monomers consisting of other compounds copolymerizable with
It can be obtained by With ethylenically unsaturated carboxylic acids
As for acrylic acid, methacrylic acid, crotonic acid, etc.
Unsaturated monocarboxylic acid; fumaric acid, maleic acid, itako
Unsaturated polycarboxylic acids such as acid and butenetricarboxylic acid
Acids: monoethyl maleate, monomethyl itaconate, etc.
Esterified Unsaturated Polyesters of Ethylenically Unsaturated Polycarboxylic Acids
Are used. The amount of ethylenically unsaturated carboxylic acid is generally
Usually, all monomers used to obtain alkali-soluble polymer
10 to 80% by weight. Copolymerizable with ethylenically unsaturated carboxylic acid
Other compounds include styrene and α-methylstyrene.
Len, vinyltoluene, pt-butylstyrene, black
Aromatic vinyl monomer such as polystyrene; (meth) acrylic
Methyl acrylate, ethyl (meth) acrylate,
Propyl acrylate, n-amyl (meth) acrylate, (meth
(T) isoamyl acrylate, n- (meth) acrylate
Xyl, 2-ethylhexyl (meth) acrylate, (meth
(T) n-octyl acrylate, 2- (meth) acrylic acid
Hydroxyethyl, hydroxy (meth) acrylate
(Meth) acrylic esters such as pills;
Ethylenically unsaturated compounds containing cyano groups such as rilonitrile
Glycidyl acrylate, glycidyl methacrylate
Glycidyl esters of any ethylenically unsaturated acids; allyl
Glycidyl of unsaturated alcohols such as glycidyl ether
Ruether; (meth) acrylamide, N-methylol
(Meth) acrylamide, N-butoxymethyl (meth)
(Meth) acrylamide compounds such as acrylamide
Are used. One or two of the above compounds
Can be used. The alkali-soluble polymer used in the present invention is:
The weight average molecular weight is usually 2,000 to 20,000
0, preferably 2,000 to 15,000. [0013] Alkali-soluble polymers are prepared by solution polymerization,
Manufactured by known polymerization methods such as polymerization, emulsion polymerization and dispersion polymerization
it can. Alkali used for neutralization of alkali-soluble polymer
Potassium is ammonia; methylamine, ethylami
, Isopropylamine, dimethylamine, N, N-di
Methylethanolamine, diisopropylamine, tri
Amines such as methylamine and triethanolamine; water
Of alkali metals such as sodium oxide and potassium hydroxide
Hydroxide and the like. Among these, is it water-soluble
Volatile is preferable, and ammonia is particularly preferable.
You. The thus obtained alkali-soluble heavy
The neutralized product of the coalescence itself forms a film at temperatures above room temperature.
It is preferable to have Also, an alkali-soluble polymer
The glass transition temperature of the neutralized product is 50 ° C or higher and 100 ° C or lower.
It is preferably below. Moistureproof if less than 50 ° C
Insufficient blocking resistance of paper, exceeding 100 ° C
The moisture-proof paper is bent due to bending of the moisture-proof paper.
May be large. Amount of neutralized alkali-soluble polymer used
Is a conjugated diene compound and other copolymerizable with it.
5 to 10 with respect to 100 parts by weight of the monomer comprising the compound
0 parts by weight, preferably 10 to 80 parts by weight. Arca
The amount of the neutralized product of the re-soluble polymer is less than 5 parts by weight.
In this case, the blocking resistance and disaggregation of the moisture-proof paper decrease.
If it exceeds 100 parts by weight, the moisture-proof paper
Inferior, especially greatly reduced moisture resistance due to bending etc.
You. The synthetic rubber latex of the present invention is an alkali latex.
A conjugated diene compound in the presence of a neutralized product of a soluble polymer;
The monomer consisting of other compounds copolymerizable with this
It is obtained by chemical polymerization. Used for emulsion polymerization
Polymerization initiator is not particularly limited, for example, potassium persulfate
Persulfates such as sodium persulfate and ammonium persulfate
Acid salt: hydrogen peroxide, benzoyl peroxide, di-t-butyl
Peroxides such as peroxides; 2,2-azobis-
2,4-dimethylvaleronitrile, azoisobutyronitrile
Azo compounds such as Ryl; peroxide is sodium bisulfite
Use a redox initiator combined with a reducing agent such as
Can be used. In addition, during emulsion polymerization, pH adjustment
Agents, chain transfer agents, defoamers, etc. can be added as appropriate
You. The method of adding the monomer in the emulsion polymerization is as follows.
Mix monomer, neutralized alkali-soluble polymer and water
To prepare an emulsion containing the monomer, and put the emulsion in a reactor.
Continuous or batchwise addition, monomer and alcohol
Separate continuous or batch neutralization of potassium-soluble polymer
And the like. The synthetic rubber latex thus obtained
The glass transition temperature of the polymer in the latex
It is always -10 ° C or higher and + 30 ° C or lower. Preferably,
More than -5 degreeC and less than +20 degreeC. Glass transition temperature
If the temperature is less than -10 ° C, use a moisture-proof paper
If the temperature exceeds + 30 ° C, it will be difficult to prevent
Poor moisture-proof properties of wet paper, especially when folded
May be greatly reduced. In the present invention, the thus obtained synthetic
Compounding rubber latex and wax emulsion
A moisture-proof layer on base paper using an aqueous emulsion composition
Let it form. Wax emulsion emulsifies wax
Wax, for example, paraffin
Wax, candelilla wax, carnauba wax
, Rice wax, montan wax, ceresin wax
Box, microcrystalline wax, petrolacta
, Fisher-Tribush wax, polyethylene
Wax, montan wax and its derivatives, micro
Crystallin wax and its derivatives, hardened castor oil,
Liquid paraffin, stearic acid amide, etc. are used
You. Of these, paraffin wax is preferred
No. Known methods for preparing wax emulsions
Method, for example, sharing wax, resin and superplasticizer
It is melted by heating or by heating after mixing.
Examples of the resin include rosin, maleated rosin, and rosin.
Esterified rosin such as malated rosin, polybute
Oil, petroleum resin, etc.
Esters, polybutene, etc. are awarded. flow
As the agent, for example, polyhydric alcohol, polyhydric alcohol
And the like. After melting, the organic
Min, ammonia, surfactant, styrene-maleic acid
Wax by adding a copolymer etc. and emulsifying
A system emulsion is obtained. The aqueous emulsion composition is a synthetic rubber latex.
By mixing wax and wax-based emulsion
Prepared. Synthetic rubber latex and wax-based emulsion
The amount of rubber used is 1 part of synthetic rubber latex in terms of solid content.
1 part by weight of wax emulsion per 100 parts by weight
At least 50 parts by weight. Wax emulsion
Is less than 1 part by weight,
Sufficient moisture-proof properties cannot be obtained, and the disintegration of moisture-proof paper
Will be enough. On the other hand, if it exceeds 50 parts by weight, bending etc.
And the desired moisture-proof paper cannot be obtained. The moisture-proof paper of the present invention has a moisture-proof layer on the base paper.
The moisture-proof layer is made of synthetic rubber latex and wax.
Aqueous emulsion prepared by blending with water-based emulsion
Formed by coating the composition on base paper and drying
It is. In the present invention, the surface is treated with a surface size or the like.
Raw paper can also be used. Application of aqueous emulsion composition to base paper
Work volume (solid content conversion) is usually 1 g / m^TwoAbove, 30g
/ M^TwoOr less, preferably 3 g / m^Two25g
/ M^TwoIt is as follows. Coating amount is 1g / m^TwoIf less than
Resulted in insufficient coating of base paper surface fibers with paint
Causes pinholes and fluffy fibers, and has a sufficient moisture-proof effect
I can't get any results. On the other hand, 30 g / m^TwoExceeds
In this case, the disintegration at the time of recovery of used paper is inferior. Coating the aqueous emulsion composition on base paper
The method is performed according to a conventional method. For example, roll coaty
Coating, air knife coating, bar coating,
This is performed by a method such as blade coating. After coating,
By drying, a moisture-proof layer is formed on the base paper.
Is obtained. The drying temperature is usually 50 ° C. or higher. [0025] The moisture-proof paper of the present invention may be optionally provided with a moisture-proof paper.
Providing an anti-slip layer on the side of the base paper where no layer is formed
Can be. Polystyrene powder, colloidal
Silica, aluminum hydroxide, light calcium carbonate, acid
Various types such as titanium oxide, zinc oxide, and modified rosin resin emulsion
Can be used. [0026] EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples.
However, the present invention is not limited to these.
Absent. The parts and percentages in these examples are not specifically noted.
As far as weight is concerned. The methods for measuring various physical properties in the examples are as follows.
It is as follows. (Glass transition temperature) Water of neutralized alkali-soluble polymer
Casting solution or synthetic rubber latex onto framed glass plate
And dried at 20 ° C. for 48 hours to obtain a film.
Lumm scanning differential calorimeter (Seiko Electronics Co., Ltd., model
Initial temperature -100 ° C, temperature rise using RDC220)
The measurement was performed at a rate of 10 ° C./min. (Molecular weight) Neutralized product of alkali-soluble polymer
Solution is cast on a glass plate with a frame, and it is 48 hours at 20 ° C.
Dry to obtain a film, which is
Dissolved in orchid and gel permeation chromatography
As the weight average molecular weight in terms of polystyrene using
I did. The evaluation method of the moisture-proof paper is as follows.
You. (Moisture permeability) 1. JIS Z 0280 (cup method) B
According to the method, the measurement was performed with the moisture-proof layer surface of the moisture-proof paper facing outward. 2. Crease moisture permeability: First, fold the moisture-proof paper into two pieces and apply a linear pressure of 5
0kg / cm^TwoBetween the calender rolls
Was. Then, open the moisture-proof paper and make it cross
And folded again into two pieces, with a linear pressure of 50 kg / cm^TwoAnd Karen
Test with cross folds, passing between Darrolls
I got a piece. The test piece was measured and folded in the same way
Moisture permeability. Evaluation criteria; 100 g or less / m as moisture permeability^Two/ 24: 00
If it is between, there is practicality, 50 g or less / m^Two/ 24 hours
Is more practical. (Blocking resistance) Size of 20 cm square
The moisture-proof layer of the moisture-proof paper is brought into contact with the uncoated surface,
Temperature 50 ° C, pressure 12kg / cm^TwoAnd crimped for 30 minutes
After taking out, judge the state of adhesion of the two pieces of paper
did.   Evaluation criteria;     When the crimping surface is light and easily peels off 〇     When the crimping surface makes a crackling sound but peels off △     When the moisture-proof layer or base paper layer breaks without peeling × (Disintegration) 1 cm × 500 ml of water
8 g of moisture-proof paper cut into 1 cm was put in, and the density was 1.6.
% Slurry was obtained. Mix this slurry into a household mixer
After stirring for 2 minutes, take out the slurry and make it by hand.
After obtaining two pulp sheets, they were dried at 120 ° C. That
The size of resinous translucent spots scattered in the sheet
Observed.   Evaluation criteria: △ or more     When the size of the spot is less than 1 mm 〇     When the size of the spot is 1 mm or more and less than 5 mm △     When the size of the spot is 5 mm or more × Reference Example 1-1 Among alkali-soluble polymers
Synthesis of Japanese (a) 51 parts of methyl methacrylate, 26 of ethyl acrylate
Parts, methacrylic acid 23 parts, octyl thioglycolate 8
Part, polymerizable surfactant (Aqualon HS10, Daiichi Kogyo
0.3 part of soft water and 50 parts of soft water were mixed and dispersed.
A monomer emulsion was obtained. On the other hand, in the reactor with stirrer
Parts were replaced with nitrogen, and 200 parts of soft water was charged and heated to 80 ° C.
Heat and add 17 parts of 5% aqueous potassium persulfate solution to the reactor
Thereafter, while maintaining the temperature at 80 ° C.,
The reaction was carried out by continuous addition over time. Monomer emulsion
After the addition of the solution, maintain the temperature at
A soluble polymer was obtained. 28% ammonia water 14
Add 30 minutes, stir for 30 minutes, then cool to room temperature
Of neutralized alkali-soluble polymer having a solid concentration of 25%
An aqueous solution was obtained. Neutralized product of this alkali-soluble polymer
Table 1 shows the properties of (a). Reference Example 1-2 Among alkali-soluble polymers
Synthesis of Japanese product (b) After replacing the inside of the reactor with a stirrer with nitrogen,
100 parts of alcohol and heated to 85 ° C.
Methacrylate 60 parts, ethyl acrylate 15 parts,
25 parts of acrylic acid and 2,2-azobi as a polymerization initiator
S-2,4-dimethylvaleronitrile 4 parts / toluene 1
2.5 parts of the solution are each kept at 85 ° C. for 4 hours.
The reactor was continuously added to and reacted. After addition is complete, react
After further two hours, the reaction was terminated by cooling to 20 ° C.
Was. Next, 14 parts of 28% ammonia water and 400 parts of soft water were added.
And neutralized, and then heated to 95 ° C.
Distilling off coal, toluene and excess water
25% neutralized aqueous solution of alkali-soluble polymer (b)
I got Properties of neutralized product (b) of this alkali-soluble polymer
The conditions are shown in Table 1. Reference Example 1-3 Among alkali-soluble polymers
Synthesis of Japanese (c) and (d) Same as Reference Example 1-1 except that the monomer was changed to the composition shown in Table 2.
Thus, a neutralized product of an alkali-soluble polymer (c) and
(D) was obtained. The properties of these alkali-soluble polymers
The results are shown in Table 1. Reference Example 1-4 Among alkali-soluble polymers
Synthesis of Japanese (e) Change the monomers to the composition shown in Table 1 and use the alkali used for neutralization.
Reference Example 1-1 except that the toxic substance was changed to dimethylamine.
In the same manner as above, the neutralized product (e) of the alkali-soluble polymer is
Obtained. Properties of the neutralized product (e) of this alkali-soluble polymer
Are shown in Table 1. [0036] [Table 1] Reference Example 2-1 Synthetic rubber latex (A)
Synthesis of In a nitrogen-purged autoclave with a stirrer, styrene 57
Part, butadiene 40 parts, glycidyl methacrylate 3 parts
86 parts of soft water, t-dodecylme
0.4 parts of lecaptan and neutralization of alkali-soluble polymer
20 parts of the product (a) are added and mixed to obtain a pre-
I got Rejon. Another autoclave with a stirrer replaced with nitrogen
Charge 98 parts of soft water and 0.5 parts of potassium persulfate
And hold the pre-emulsion for 3 hours at 70 ° C.
After the addition, the reaction was further continued for 4 hours. After the reaction,
The reaction monomer is removed to obtain a synthetic rubber latex (A)
Was. Table 2 shows the properties of the obtained synthetic rubber latex (A).
Show. Reference Example 2-2 Synthetic rubber latex (B)
Synthesis of ~ (K) Including neutralized alkali-soluble polymer and monomer mixture
Except that the composition of the pre-emulsion was as shown in Table 2.
Is a synthetic rubber latex in the same manner as in Reference Example 2-1.
(B) to (K) were obtained. Obtained synthetic rubber latex
Table 2 shows the properties of (B) to (K). [0039] [Table 2] Reference Example 2-3 Synthetic rubber latex (L)
Synthesis of 25 parts of soft water, lauryl
0.1 parts of sodium sulfate, 0.2 parts of sodium bicarbonate,
Styrene 48 parts, itaconic acid 1 part, acrylamide 1 part
And mixing to obtain a pre-emulsion for the first stage.
Was. In another tank with a stirrer replaced with nitrogen, 25 parts of soft water,
0.1 parts of sodium lauryl sulfate, sodium bicarbonate
0.2 parts, t-dodecyl mercaptan 0.2 parts, polystyrene
18 parts, butadiene 25 parts, methyl methacrylate 5
Parts, 1 part of itaconic acid and 1 part of acrylamide.
Thus, a pre-emulsion for the second stage was obtained. Meanwhile, nitrogen
34 parts of soft water and ethyl were added to the replaced autoclave with stirrer.
0.05 parts of diamine tetraacetic acid tetrasodium salt, la
0.1 parts of sodium uryl sulfate and 0.1 part of potassium persulfate.
Charge 2 parts, heat to 80 ° C.,
Add 10% of the emulsion to the autoclave,
The reaction was performed for 1 hour. Then 0.8 parts of potassium persulfate and
Add 20 parts of soft water and leave the remaining pre-emuljo
Was continuously added over 2 hours. Continue to 80 ° C
Hold the second stage pre-emulsion for 2 hours
Added continuously. End of pre-emulsion for second stage
After completion of the reaction, the temperature was kept at 80 ° C. for further 4 hours, and the unreacted monomer
And adjust the pH to 8 with a 5% aqueous sodium hydroxide solution.
By adjusting the carboxy-modified styrene having a core-shell structure,
Butadiene latex (L) (glass transition point 20 ° C)
I got Table 3 shows the properties of the synthetic rubber latex (L).
You. Reference Example 2-4 Synthetic Rubber Latex (M)
Synthesis of 50 parts of soft water and lauryl in a tank with a stirrer purged with nitrogen
0.2 parts of sodium sulfate, 0.4 parts of sodium bicarbonate,
0.3 parts of t-dodecyl mercaptan, 58 parts of styrene,
Butadiene 33 parts, methyl methacrylate 5 parts, itako
Acid and 2 parts of acrylamide are mixed and mixed.
An emulsion was obtained. On the other hand, with a stirrer replaced with nitrogen
34 parts of soft water and ethylenediamine tetra vinegar
Acid tetrasodium salt 0.05 parts, sodium lauryl sulfate
0.1 part and 0.2 part of potassium persulfate are charged, and 80 ° C.
To 5% of the pre-emulsion
It was added to the clave and reacted for 1 hour. After that,
Add 0.8 parts of lithium and 20 parts of soft water, and
The marjon was added continuously over 4 hours. Pleema
After the addition of the solution was completed, the temperature was kept at 80 ° C. for 4 hours,
Unreacted monomer is removed, and 5% aqueous sodium hydroxide
Adjust the pH to 8 with a liquid to
Boxy-modified styrene-butadiene latex (M)
(Glass transition temperature: 10 ° C.). Synthetic rubber latex
Table 3 shows the properties of (M). [0042] [Table 3]Method of making moisture-proof paper Solid content of various synthetic rubber latexes obtained in Reference Examples 1
For 00 parts wax emulsion (Chukyo Yushi Co., Ltd.)
15 parts of Hydrin P7)
An aqueous emulsion composition having a form concentration of 35% was obtained. this
75 g / m2^TwoCraft
15g / m solids on one side of paper using Meyer bar^Two
Coated and dried at 110 ° C for 0.5 minutes to make a moisture-proof paper
Was. Examples 1 to 11 Using synthetic rubber latex (A) to (G), the above moisture proof
Moisture-proof paper is made according to the method of making
The blocking property and the disintegration property were measured. Embodiment 13 Wax emulsion using synthetic rubber latex (A)
Except that the solid content of the component is 2 parts or 45 parts.
Create moisture-proof paper according to the moisture-proof paper manufacturing method,
The degree, blocking resistance and disaggregation property were measured. Embodiment 14 100 parts of synthetic rubber latex (A)
Marjon (OKW-40 Parafu manufactured by Arakawa Chemical Co., Ltd.)
30 parts (9% in terms of solid content)
Part) Aqueous emulsion composition with added solid content of 35%
I got something. Using this aqueous emulsion composition,
Create moisture-proof paper in the same way, moisture permeability and blocking resistance
And disintegration were measured. [0047] [Table 4]Comparative Examples 1-2 Moisture proof using synthetic rubber latex (L), (M)
Moisture-proof paper is made according to the method of making
The blocking property and the disintegration property were measured. Comparative Example 3 Commercially available polyethylene laminated kraft paper (90 g
/ M^Two; Water vapor permeability,
The rocking property and the disintegration property were measured according to the examples. [0050] [Table 5] [0051] As described above, according to the present invention, the moisture-proof property is excellent.
The moisture resistance is impaired, especially by folding the paper
No blocking during winding or packaging
It is possible to obtain a moisture-proof paper which does not occur. further
According to the present invention, it can be recycled after being recovered as used paper
A moisture-proof paper can be obtained.

Continuing on the front page (72) Inventor Kazuhiro Sato 1-2-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Within the Zeon Corporation General Development Center (72) Inventor Atsushi Toyama 1-chome, Yakko, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture No. 2 in the Zeon Corporation General Development Center (56) References JP-A-53-41511 (JP, A) JP-A-7-119079 (JP, A) JP-A-8-3895 (JP, A) JP-A-7-279093 (JP, A) JP-A-4-334447 (JP, A) JP-A-7-331594 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D21H 11/00-27/42

Claims (1)

(57) [Claim 1] An aqueous emulsion composition comprising a synthetic rubber latex and a wax-based emulsion is coated on a base paper and has a moisture-proof layer formed by drying. In the moisture-proof paper, in the presence of 5 to 100 parts by weight of the synthetic rubber latex is a neutralized alkali-soluble polymer,
Monomer 1 comprising 20 to 60% by weight of a conjugated diene compound and 40 to 80% by weight of another compound copolymerizable therewith
Moistureproof paper characterized by being a synthetic rubber latex obtained by emulsion polymerization of 00 parts by weight .