JP2000212470A - Undercoat sealer for cement form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealer which penetrates the surface of various cement- based forms, reinforces fragile parts and improves adhesion to overcoat paints in the next process and water resistance of the overcoat paint when coated on the surface of various cement-based forms. SOLUTION: A polymer mainly composed of 1,3-pentadiene with an iodine number of 200-500 and a weight average molecular weight of 350-10,000 is blended with a modified polymer into which epoxy groups and hydroxy groups part of which may be esterifed are introduced and a synthetic resin emulsion in a weight ratio of solids of (100-900):100.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the surface coating of various cement-based moldings, which exhibits excellent permeability, reinforcement, adhesion and water resistance to the moldings, and can be used with various coating materials for top coating. The present invention relates to a one-component curable undercoating material having excellent adhesion.

[0002]

2. Description of the Related Art In recent years, cement-based inorganic building materials or cement-based cast-in-constructions (hereinafter sometimes referred to as "base materials").
The surface of a base material is remarkably weakened by asbestos use regulations and the like, and a conventional one-component curing type undercoat material in the surface coating of various cement-based moldings such as the above base material (in this specification, this undercoat material is In some cases, it is very difficult to reinforce the surface layer of the molded article. In view of this, there are marketed products in which the particle size of the sealer is reduced or a product obtained by copolymerizing a monomer having a functional group that improves the adhesiveness. The properties, the reinforcing properties of the surface, and the adhesion to the top coating material are still insufficient. Conventionally, as a measure for improving an emulsion coating material mainly on a metal surface, an epoxy group and a hydroxyl group have been added to a polymer having an iodine value of 200 to 500 and an average molecular weight of 350 to 10,000 obtained by using 1,3-pentadiene as a main monomer. Disclosed is a technique for improving adhesion, water resistance, chemical resistance (such as alkali resistance), weather resistance, and corrosion resistance by adding a modified polymer into which a group (a part of which may be esterified) is introduced. (JP-A-54-36340)
However, there is no mention of reinforcing the surface layer of the molded body in the surface coating of various cement-based molded bodies such as the base material.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an overcoating material which can penetrate into the surface of various cement-based moldings such as a substrate to reinforce and strengthen a fragile portion, and which is applied in the next step. It is an object of the present invention to provide a sealer capable of improving the adhesion with the sealant and the water resistance of the top coat.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have found that the above-mentioned problems can be solved by mixing a specific pentadiene-based polymer with a synthetic resin emulsion. Thus, the present invention has been completed. That is, the gist of the present invention is that the iodine value of 1,3-pentadiene as a main constituent monomer is 200 to 500,
A weight ratio (10-900) of a modified polymer obtained by introducing an epoxy group and a hydroxyl group which may be partially esterified into a polymer having a weight average molecular weight of 350 to 10,000 and a synthetic resin emulsion to a solid content: The undercoat sealer for a cement molded article according to claim 1, which contains 100.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The modified polymer used in the present invention is a homopolymer having 1,3-pentadiene as a main constituent monomer or a copolymer having isoprene, isobutylene, butadiene, styrene or the like as a copolymer monomer. A modified product of a polymer having an iodine value of 200 to 500 and a weight average molecular weight of 350 to 10,000, wherein an epoxy group and a copolymer are added to the above homopolymer or copolymer of 1,3-pentadiene. This is the one in which a hydroxyl group which may be esterified is introduced.

In the case of a copolymer containing 1,3-pentadiene as a main constituent monomer, the content of 1,3-pentadiene is preferably at least 10 mol%, particularly preferably at least 30 mol%. The iodine value of the homopolymer or copolymer is 200
If it is less than 500, the drying property is poor (slow drying) and the curing is poor. If it exceeds 500, the wettability is poor and the adhesion is poor. In any case, the object of the present invention relating to the improvement of the base material cannot be achieved. . Further, when the weight average molecular weight is 350
If it is less than 30, the cohesive strength is insufficient and the water resistance is poor, and if it exceeds 10,000, the wettability is poor and the adhesion is poor, and in any case, the object of the present invention relating to the improvement of the base material is achieved. Can not do.

[0007] The modified polymer used in the present invention preferably has an epoxy group equivalent of 240 to 1200 and a hydroxyl group (including esterification) equivalent of 3 to 3.
00-5000 aqueous resin. Epoxy group equivalent is 2
If it is less than 40, the water resistance tends to be poor, and if it exceeds 1200, it is likely to be brittle. When the hydroxyl group (including esterification) equivalent is less than 300, the wettability is poor and the adhesion tends to be poor.
If it exceeds 0, the alkali resistance may be deteriorated.
Further, when no epoxy group or hydroxyl group (including the case of esterification) is present at all, the water resistance is remarkably deteriorated, the phenomenon that the compatibility with the synthetic emulsion is deteriorated is observed, and the present invention relates to the improvement of the base material. It is not preferable for achieving the purpose of

The method of introducing the epoxy group and the hydroxyl group which may be partially esterified is not particularly limited, and can be achieved by a conventional method. For example,
The most common method is to dissolve the above homopolymer or copolymer as it is or in a solvent, and react 30% by weight or more of hydrogen peroxide at a temperature of 50 to 80 ° C. in the presence of a lower carboxylic acid. . In the above reaction, the addition ratio of hydrogen peroxide to the homopolymer or copolymer is preferably 0.02 to 2.0 mol of hydrogen peroxide per 1 mol of double bond contained in these polymers. Preferably 0.
It is blended to be 3 to 1.0 mol.

The solvent used when the above reaction is carried out by dissolving a homopolymer or a copolymer is not particularly limited, but chlorinated hydrocarbon solvents such as chloroform, carbon tetrachloride, etc. , Aromatic hydrocarbon solvents,
For example, benzene, toluene, xylene and the like are preferable.
The addition amount is preferably 30 to 90% by volume, more preferably 50 to 70% by volume, based on 100% by volume of the homopolymer or the copolymer.

Further, as the lower carboxylic acid used in the above reaction, for example, formic acid, acetic acid, propionic acid and the like are suitable. Of these, formic acid is particularly preferable, and the amount of the formic acid is the same as that of a homopolymer or a copolymer. The amount is preferably 0.01 to 2.0 mol per mol of double bond, particularly 0.1 to 2.0 mol.
1.0 mole is preferred. In the introduction of the epoxy group, the use of a reaction catalyst is not always necessary. For example, an acid catalyst such as sulfuric acid, phosphoric acid, and paratoluenesulfonic acid and a cation-type ion exchange resin catalyst can be used. Above, specific examples of the method for producing the aqueous modified polymer used in the present invention have been described in detail.In addition to the method for using hydrogen peroxide, for example, peracetic acid, perbenzoic acid, and other oxidizing agents are used. And other known methods can also be used.

The amount of the aqueous modified polymer to be added to the synthetic resin emulsion is preferably 10 to 900 parts by weight, more preferably 30 to 300 parts by weight, based on 100 parts by weight of the solid content of the synthetic resin emulsion. Here, when the amount of the aqueous modified polymer is less than 10 parts by weight, when used as an undercoat sealer for a cement molded product, the freeze-thaw resistance is likely to be inferior. It is easy to become inferior.

As the synthetic resin emulsion used in the present invention, known synthetic resin emulsions can be widely used, and there is no particular limitation, and the following general aqueous emulsions can be used. (1) Vinyl acetate emulsions (for example, polyvinyl acetate, ethylene-vinyl acetate copolymer, vinyl acetate- (meth) acrylic acid or its ester copolymer, vinyl acetate-vinyl chloride copolymer, ethylene-vinyl acetate -Vinyl chloride copolymers, copolymers of vinyl acetate with vinyl esters called Veova such as vinyl propionate, vinyl caprylate, vinyl versatate, and vinyl acetate-maleate ester copolymers (2) a (meth) acrylic emulsion (e.g., homo- or copolymer of (meth) acrylic acid or its ester monomer, (meth) acrylic acid or its ester-styrene copolymer) (Emulsions containing (meth) acrylic resins such as polymers), (3) Styrene-based emulsions ( Example, if a styrene - (meth) acrylic acid or ester copolymer, styrene -
Emulsion containing a styrene resin such as butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer), (4) halogen-containing resin emulsion (for example, polychloroprene, polyvinyl chloride, vinyl chloride-acetic acid) Vinyl copolymer, polyvinylidene chloride, vinylidene chloride- (meth) acrylic acid copolymer, copolymer of vinylidene chloride- (meth) acrylic acid or its ester, vinylidene chloride-acrylonitrile copolymer, vinylidene chloride-vinyl acetate Emulsions containing vinylidene chloride-based resins such as copolymers, chlorinated polyolefins such as chlorinated polyethylene and chlorinated polypropylene, and halogen-containing resins such as fluorine-based resins); (5) Other emulsions (eg, epoxy resins, urethane resins) Emulsion comprising thermosetting resins such as silicone resin emulsion, etc.). (6) a composite emulsion in which a plurality of resin components are composited (for example, a mixed type composite emulsion of the synthetic resin emulsion described above, a crosslinking agent (for example, an amino resin such as a urea resin, a melamine resin, or a benzoguanamine resin, a polyisocyanate compound, Epoxy compounds, polyethyleneimine, etc.) and reactive functional groups (for example, hydroxyl group, carboxyl group, amino group, glycidyl group, methylol group,
Composite emulsion containing a resin emulsion having an alkoxymethyl group or the like), an aqueous resin emulsion in which a plurality of polymer chains are blocked or graft-polymerized, an α, β- such as a vinyl group or a (meth) acryloyl group in the presence of polymer particles. Synthetic resin emulsion having a core / shell structure obtained by polymerizing a monomer having an ethylenic polymerizable unsaturated group, synthetic resin emulsion having a microdomain structure, vinyltriethoxysilane, γ- (meth) acryloxypropyltrimethoxysilane Acrylic emulsion obtained by copolymerizing a silane coupling agent as a representative).

Among the above synthetic resin emulsions, preferred emulsions in the present invention include the following. (1) Vinyl acetate emulsions (for example, ethylene-vinyl acetate copolymer, vinyl acetate- (meth) acrylic acid or its ester copolymer, vinyl acetate-Veova)
(2) a (meth) acrylic emulsion (for example, a homo- or copolymer of (meth) acrylic acid or its ester-based monomer, (meth) acrylic acid or (3) an emulsion containing a (meth) acrylic resin such as an ester-styrene copolymer, and (3) a styrene emulsion (for example, styrene- (meth) acrylic acid or its ester copolymer, styrene-
(4) an emulsion containing a styrene-based resin such as an acrylonitrile copolymer; (4) a halogen-containing resin emulsion (for example, a vinylidene chloride-based resin such as vinylidene chloride- (meth) acrylic acid or an ester copolymer thereof; chlorinated polyethylene; (5) Other emulsions (e.g., thermosetting resins such as urethane resin, emulsions containing silicone resin), (6) Composite emulsions (e.g., (meth)) Acrylic acid or its ester homopolymer or copolymer / epoxy resin,
(Meth) acrylic acid or its ester homopolymer or copolymer / urethane resin, (meth) acrylic acid or its ester homopolymer or copolymer / silicone resin, (meth) acrylic silicone resin, (meth) acrylic acid or Emulsion comprising a complex of a plurality of resin components composed of the ester / fluorine resin).

More preferred synthetic resin emulsions include (meth) acrylic emulsions such as (meth) acrylic acid or its ester-styrene copolymer emulsion, and (meth) acrylic acid or its ester homopolymer or copolymer / urethane resin. Complex emulsion of (meta)
Acrylic acid or its ester homo- or copolymer / silicone resin emulsion, (meth) acrylic acid or its ester homo- or copolymer / silicone emulsion, (meth) acrylic acid or its ester homo- or copolymer / Melamine resin emulsions. Among these synthetic resin emulsions, synthetic resin emulsions excellent in water resistance, alkali resistance, freeze-thaw resistance, adhesion, weather resistance and the like are preferably used. In addition, from the viewpoint of adhesion and economy, preferred synthetic resin emulsions include:
For example, (meth) acrylic acid emulsion or (meth) acrylic acid or its ester-styrene copolymer emulsion, and (meth) acrylic acid or its ester-based homo- or copolymer / silicone resin-based emulsion can be mentioned.

A method for producing these synthetic resin emulsions will be described with reference to typical examples. The (meth) acrylic emulsion is prepared by subjecting a radical polymerizable monomer to a conventional method in the presence or absence of an emulsifier such as a surfactant.
It can be obtained by emulsion polymerization. As the radical polymerizable monomer, an α, β-ethylenically unsaturated compound, for example, a compound having an acryloyl group, a methacryloyl group, a vinyl group, or the like can be used. More specifically,
The monomers include (a) (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate,
t-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) (B) aromatic vinyl compounds such as acrylate, cyclohexyl (meth) acrylate, phenyl (meth) acrylate, and benzyl (meth) acrylate, for example, styrene, α
(C) α, β-ethylenically unsaturated compounds having a hydroxyl group, such as methylstyrene and vinyltoluene, for example, 2-hydroxyethyl (meth) acrylate, 2
-Hydroxypropyl (meth) acrylate, etc.
(D) a monomer having an (e) acid group, for example, acrylic acid, such as an α, β-ethylenically unsaturated compound having a glycidyl group, for example, glycidyl (meth) acrylate;
Α, β-ethylenically unsaturated carboxylic acids such as methacrylic acid, crotonic acid, itaconic acid, itaconic acid half ester, maleic acid, maleic acid half ester, α, β-
Monomers having an ethylenically unsaturated sulfonate, such as sodium styrene sulfonate, sodium vinyl sulfonate, and the like, are included.

If necessary, other monomers, for example, the following may be used in combination. (F) Vinyl esters (vinyl acetate, vinyl propionate, vinyl caproate and Ve
ova, etc.), (g) fumaric acid esters and corresponding maleic acid esters (diethyl fumarate, dibutyl fumarate, dioctyl fumarate, di (2-ethylhexyl) fumarate), N-methylol (meth) acrylamide, N -Methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, (meth) acrylamide, diacetone (meth) acrylamide, (meth) acrylonitrile, vinyl chloride , Vinylidene chloride and the like.

Preferred combinations of monomers include:
When constituting a (meth) acrylic acid or its ester-based emulsion or a (meth) acrylic acid or its ester-styrene-based emulsion, the radical polymerizable monomer is, for example, a glass transition temperature of 50 ° C. or higher, preferably 70 to 130. With a hard monomer forming a hard polymer of about 100 ° C. and a glass transition temperature of 20 ° C. or lower, preferably −100 ° C.
It is often used in combination with a soft monomer that forms a soft polymer at about 0 ° C. Representative hard monomers include methyl methacrylate, t-butyl methacrylate, styrene, and the like, and typical soft monomers include, for example, ethyl acrylate, butyl acrylate,
2-ethylhexyl acrylate and the like can be mentioned. The ratio of the reaction between the hard monomer and the soft monomer is, for example, hard monomer / soft monomer = 10 to 90/90 to 10 (weight ratio), preferably 25 to 75/75 to 25 ( Weight ratio). In order to further enhance the adhesion, water resistance and flexibility of the coating film, a radical polymerizable monomer having a crosslinkable functional group such as a glycidyl group or an N-methylol group may be used in combination.

The emulsion polymerization is carried out by using an anionic surfactant,
In the presence of a surfactant such as a nonionic surfactant, or a protective colloid such as polyvinyl alcohol or a water-soluble polymer, a water-soluble polymerization initiator (for example, persulfates such as potassium persulfate and ammonium persulfate, hydrogen peroxide, etc.) Can be performed. Further, the aqueous emulsion may be a soap-free emulsion containing no surfactant. Soap-free emulsion is a method in which a polymerizable monomer containing an acidic monomer such as (meth) acrylic acid is solution-polymerized, and the resulting hydrophilic oligomer or polymer is used as a seed for emulsion polymerization in an aqueous system, such as (meth) acrylic acid. It can be obtained by, for example, a method of polymerizing an acidic monomer together with another polymerizable monomer in an emulsion polymerization system.

The pH of the resulting synthetic resin emulsion can be selected within a range that does not impair the stability of the coating material.
H7 to about 10 are often neutral or alkaline. The glass transition temperature and the molecular weight of the resin contained in the synthetic resin emulsion can be appropriately selected within a range that does not impair the performance depending on the properties of the base material and the like and the coating conditions. The glass transition temperature of the resin contained in the synthetic resin emulsion is, for example, about 0 to 50 ° C. in order to increase the adhesion, and particularly preferably 0 to 30 ° C. in order to increase the freeze-thaw resistance. In addition,
The glass transition temperature means a value calculated by the following formula of Tobolsky. 1 / Tg = Wa / Tga + Wb / Tgb + where Tg is the glass transition temperature (° K) of the copolymer, T
ga is the glass transition temperature of the homopolymer of monomer a (°
K) and Tgb indicate the glass transition temperature (° K) of the homopolymer of monomer b, Wa indicates the weight fraction of monomer a, and Wb indicates the weight fraction of monomer b. The weight-average molecular weight of the resin contained in the synthetic resin emulsion is, for example, 40,000 to 20000 in order to increase the stain resistance.
Approximately 100,000, 50,000-1 in consideration of other performance balance
About 50,000 is good.

In the synthetic resin emulsion, the average particle size of the resin particles can be selected within a range that does not impair the dispersion stability, stain resistance, adhesion, etc., for example, 0.01 to 5 μm,
Preferably 0.02-1 μm, more preferably 0.02 μm
It is about 2 to 0.1 μm. In addition, it is also possible to use a so-called water-soluble resin in which a hydrophilic group (for example, a hydroxyl group, a carboxyl group, etc.) is introduced to make the compound water-soluble, and the amino acid is neutralized or ionized. it can.

In the present invention, various pigments such as titanium oxide, iron oxide pigment, clay, talc, calcium carbonate, mica powder, pearlite, silica powder, etc., and cellulose thickeners such as polyvinyl alcohol and methyl cellulose may be used, if necessary. And organic solvents such as cellosolves, surfactants, preservatives, mosquito repellents, defoamers, neutralizing agents, and the like, if necessary.

Hereinafter, the present invention will be described in detail with reference to examples.

EXAMPLES [Production Example of Synthetic Resin Emulsion (A)] 300 parts by weight of distilled water and 5 parts by weight of sodium lauryl sulfate were placed in a glass flask equipped with a stirrer and a condenser, and sodium lauryl sulfate was dissolved under stirring. After that, the temperature was raised to 80 ° C. Then, sodium persulfate 1
A mixture of 150 parts by weight of methyl methacrylate, 150 parts by weight of butyl acrylate, and 3 parts by weight of acrylic acid was added dropwise over 3 hours to polymerize and cooled.
To the resulting emulsion, 3 parts by weight of 25% aqueous ammonia was added at 30 ° C. to obtain an acrylic resin-based synthetic resin emulsion (A) having a solid content of 50% by weight. In the obtained acrylic resin-based synthetic resin emulsion, the resin had a glass transition point of 4 ° C., an average particle diameter of 0.05 μm, and a weight average molecular weight of 90,000.

[Production Example of Aqueous Modified Polymer (B)] Liquid polypentadiene 50 having a molecular weight of 2,000 and an iodine value of 360
0 parts were dissolved in 1500 parts of chloroform, 85 parts by weight of formic acid (85 parts) and phosphoric acid (2 parts) were added thereto, the temperature was raised to 60 ° C. with stirring, and 171 parts of hydrogen peroxide were added dropwise over about 2 hours. Hold at temperature for 3 hours. After the reaction, the polymer was washed with water until pH = 7, and the solvent was removed. Thus, a modified polymer having an epoxy equivalent of 371 and a hydroxyl group equivalent of 1764 was obtained.

(Example 1) Synthetic resin emulsion (A)
100 parts by weight of a solid content (meaning a synthetic resin emulsion having an amount of the solid content of 100 parts by weight) and 50 parts by weight of an aqueous modified polymer (B) were mixed and stirred, and 10 parts by weight of butyl cellosolve and anion were added. 1 part by weight of a water-soluble surfactant and 0.05 part by weight of an antifoaming agent were added to obtain a liquid for an undercoat sealer for cement molding having a nonvolatile content of 20%.

(Example 2) Synthetic resin emulsion (A)
While 100 parts by weight of the solid content and 100 parts by weight of the aqueous modified polymer (B) were mixed and stirred, 10 parts by weight of butyl cellosolve, 1 part by weight of an anionic surfactant, and 0.05 part by weight of an antifoaming agent were added. A liquid for an undercoat sealer for cement moldings having a nonvolatile content of 20% was obtained.

(Example 3) Synthetic resin emulsion (A)
100 parts by weight of the solid content and 200 parts by weight of the aqueous modified polymer (B) were mixed and stirred, and 10 parts by weight of butyl cellosolve, 1 part by weight of an anionic surfactant, and 0.05 part by weight of an antifoaming agent were added. A liquid for an undercoat sealer for cement moldings having a nonvolatile content of 20% was obtained.

Comparative Example 1 Synthetic Resin Emulsion (A)
100 parts by weight of a solid content and 5 parts by weight of an aqueous modified polymer (B) were mixed and stirred, and 10 parts by weight of butyl cellosolve, 1 part by weight of an anionic surfactant, and 0.05 part by weight of an antifoaming agent were added. A liquid for an undercoat sealer for cement moldings having a nonvolatile content of 20% was obtained.

Comparative Example 2 Synthetic Resin Emulsion (A)
100 parts by weight of solid content and 1000 of aqueous modified polymer (B)
10 parts by weight of butyl cellosolve, 1 part by weight of an anionic surfactant, and 0.05 part by weight of an antifoaming agent were added to the mixed parts by weight, and a liquid for an undercoat sealer for cement moldings having a nonvolatile content of 20% was obtained. Was.

The semester obtained in each of the above Examples and Comparative Examples was used.
Raise the undercoat sealer for molded parts to 50 ° C in advance.
70g for warm cement molding (flexible board)
/ M ^TwoSpray coating with the application amount of
120g / m of water-based acrylic resin top coat^TwoApplication
Spray-coated in a quantity and dried with hot air at 120 ° C for 3 minutes to obtain a test specimen
Was. Adhesion of the top coat paint film (normal adhesion
) And durability (warm water resistance and freezing resistance)
Was. The evaluation results are shown in Table 1.

[0030]

[Table 1]

The contents of the evaluation criteria are as follows. (1) Adhesion in normal condition: The cloth adhesive tape stuck to the coating surface of the painted test specimen (cement molding) was quickly peeled off,
Judgment is made based on the following criteria based on the peeling area ratio of the coating film. ◎: No peeling ：: There is a peeled part, but the peeled area is less than 5%. Δ: The peeled area is 5 to 10%. ×: The peeled area is 20% or more. After immersion in warm water for one day, the number or area ratio of small blisters is determined according to the following criteria. ：: No blisters ：: Small blisters less than 1 to 3 △: Blister area 5 to 10% ×: Blister area 20% or more (3) Freezing and thawing resistance: Painted specimens were frozen at -20 ° C in water. Melting in water at + 10 ° C repeatedly at intervals of about 5 hours 40
The cycle is performed, and the peeling state of the coating film is determined based on the following criteria based on the peeling area ratio. ◎: No peeling ：: Peeling is present, but peeling area is less than 5% Δ: Peeling area is 5 to 10% ×: Peeling area is 20% or more

[0032]

In the surface coating of various cement-based molded articles, when the undercoat sealer for a cement-based molded article according to the present invention is applied to the surface of the cement-based molded article, and then a normal topcoat is applied, the coated surface becomes It has been found that even when exposed to severe conditions, the adhesion and durability of the coating film can be maintained well, and peeling of the coating film can be prevented as much as possible.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) C09D 163/00 C09D 163/00 201/00 201/00 F term (reference) 4D075 CA13 CA35 CA38 CA50 DA23 DB12 EA13 EA39 EB33 EB55 EB56 4G028 CA02 CB01 CB06 CC01 4J038 CA021 CA022 CA081 CA082 CB091 CB092 CB171 CB172 CC021 CC022 CD021 CD022 CD081 CD082 CD091 CD092 CF021 CF022 CG03 DB001 002 CG141 CG142 CG141 CG142 CG141 CG142 MA14 NA04 NA12

Claims (1)

[Claims] An iodine value of 1,3-pentadiene as a main constituent monomer is 200 to 500, and a weight average molecular weight is 350.
The weight ratio of the solid content of the modified polymer obtained by introducing an epoxy group and a hydroxyl group which may be partially esterified into a 10,000 polymer and a synthetic resin emulsion (10
-900): The undercoat sealer for a cement molding according to claim 1, which contains 100.