JPH0832810B2 - Plastisol composition and primer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is useful as a paint for a base-hardening paint (sealer) or an undercoat (undercoat) of various industries including the automobile industry, and is meltable and plasticizable at a low temperature. The present invention relates to a vinyl chloride plastisol composition in which the agent is difficult to transfer.

[Prior Art] In vinyl chloride resins, phthalate esters such as dioctyl phthalate and fatty acid esters such as dioctyl adipate are widely used as plasticizers in order to impart flexibility thereto. However, these monomeric plasticizers have the basic drawbacks that they have a large property of migrating from the inside to the surface of a molded product formed by molding a vinyl chloride resin containing them and are easily extracted by a solvent. For example,
Apply vinyl chloride plastisol as an undercoat for automobile bodies, and apply wet-on-wet processing (after applying plastisol, apply a top-coat paint before gelling it and heat it to bake at the same time as gelling). When the paint is applied, the plasticizer is transferred to the paint solvent in the processing step, which causes a problem that the smoothness and luster of the surface of the topcoat are hindered. Adipic acid with ethylene glycol, 1, for the purpose of non-migration
It has been attempted to use a liquid polyester plasticizer obtained by reacting a dihydric alcohol such as 3-butanediol alone or in combination with a general-purpose plasticizer. Vinyl chloride using these plasticizers Although the plasticizer migration of plastisol or molded products produced from the plastisol is improved, it is difficult to obtain those with excellent mechanical properties unless melted at high temperature, and in the case of high temperature melting, deterioration of the molded product occurs. However, there is a drawback that it is easy and the molding work is dangerous. Further, since the above-mentioned plasticizer is made of expensive adipic acid as a raw material, it is unavoidably economically disadvantageous.

[Problems to be Solved by the Invention] The present inventor has determined that the plasticizer in vinyl chloride plastisol has a migration property to a solvent contained in a paint or the like, or a migration property to a coating film or another plastic molded product, compared with a conventional polyester. A plasticizer for plastisol as a result of diligent studies aimed at obtaining a plastisol that is equal to or more than a plasticizer and that has excellent mechanical properties even when the plastisol is melt-molded at low temperature. As a result, they have found that the above object can be achieved by using a polyester plasticizer having a molecular weight of 600 to 750 using phthalic acid as a dibasic acid component and completed the present invention.

[Means for Solving Problems] That is, the gist of the present invention is that a vinyl chloride paste resin and a molecular weight represented by the following general formula is 600
Phthalate of 750 polyester plasticizer AP-G _n P-A (wherein, P is, o- phthalic acid, residues G of isophthalic acid or terephthalic acid, ethylene glycol, diethylene glycol,
1,2-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, Residue A of one or more alcohols selected from 1,6-hexanediol A is a residue of a monohydric alcohol having 4 to 13 carbon atoms,
Each of them is bound by a -COO- group.

n is the average weight (contraction) degree and is a positive number in the range of 1-2. And a plastisol composition containing an adhesiveness-imparting agent in the composition.

To explain the present invention in detail, vinyl chloride paste resin, which is the main component of the plastisol composition used in the present invention, comprises vinyl chloride or a mixture of vinyl chloride and a comonomer copolymerizable therewith as an emulsifier and a water-soluble polymer. It is produced by emulsion polymerization in the presence of an initiator, or in the presence of a dispersant and an oil-soluble polymerization initiator, the whole amount or a part of vinyl chloride or a mixture of vinyl chloride and a comonomer copolymerizable therewith is mechanically treated. It is manufactured by a fine suspension polymerization method in which the particles are finely dispersed and then polymerized. In addition, a vinyl chloride resin having a large particle size produced by ordinary suspension polymerization may be used in combination as long as it does not adversely affect the viscosity, fluidity, processability, etc. of the paste sol. Examples of vinyl chloride copolymerizable comonomers include vinyl esters such as vinyl acetate, vinyl propionate, and vinyl laurate, methyl acrylate, ethyl acrylate, butyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and 3-hydroxypropyl acrylate. Acrylic acid esters such as hydroxybutyl acrylate, methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, 2-hydroxypropyl methacrylate and 3-chloro-2-hydroxypropyl methacrylate, maleic acid esters such as dibutyl maleate and diethyl maleate. , Fumaric acid esters such as dibutyl fumarate and diethyl fumarate, vinyl vinyl ethers such as vinyl methyl ether, vinyl butyl ether and vinyl octyl ether Ethers, acrylonitrile, vinyl cyanide such as methacrylonitrile, α-olefins such as ethylene and propylene, vinylidene chloride, vinylidene halide other than vinyl chloride such as vinyl bromide or vinyl halides, and the like. 30% by weight or less, preferably one or more of
Used in the range of 20% by weight or less.

One of the main components of the composition of the present invention has a molecular weight of 600 to 750.
The phthalic acid polyester plasticizer (hereinafter referred to as “phthalic acid polyester plasticizer”) has a chemical structure represented by the following general formula.

AP-G _n PA (wherein P is a residue of o-phthalic acid, isophthalic acid or terephthalic acid, G is ethylene glycol, diethylene glycol,
1,2-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, Residue A of one or more alcohols selected from 1,6-hexanediol is a residue of a monohydric alcohol having 4 to 13 carbon atoms and is bonded to each by a -COO- group.

n is the average weight (contraction) degree and is a positive number in the range of 1-2. ) This phthalic acid-based polyester plasticizer is usually phthalic acid, dihydric alcohol and monohydric alcohol in the required amounts of tetraisopropyl titanate, dibutyltin oxide,
It is produced by heating at a temperature of 100 to 250 ° C. in the presence or absence of a catalyst such as paratoluenesulfonic acid and sulfuric acid to carry out an esterification reaction while removing water produced by the reaction. The monohydric alcohol acts as a molecular weight regulator, and when added in a large amount, the average degree of polymerization becomes small, and when it is a small amount, it becomes high. Therefore, it is preferable that the average degree of polymerization n is in the range of 1 to 2 mainly depending on the addition amount of the monohydric alcohol. Also,
It is also possible to add a monohydric alcohol at an arbitrary ratio and remove the low boiling point portion after esterification so that the average degree of polymerization n = 1 to 2 is reached.

It is desirable that the phthalic acid polyester plasticizer has a small amount of active hydrogen, such as a hydroxyl value and an acid value of 5 m each.
Values below gKOH / g and below 0.5 mgKOH / g are preferred.

As the phthalic acid used in the phthalic acid-based polyester plasticizer, it is most preferable to use phthalic anhydride as a raw material.

Examples of the dihydric alcohol include ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, neopentyl glycol and 1,5-pentane. One or more selected from diol, 3-methyl-1,5-pentanediol and 1,6-hexanediol are used.

As the monohydric alcohol, butanol, pental,
Hexanol, heptanol, n-octanol, 2-
Alcohol having 4 to 13 carbon atoms such as ethylhexanol, nonanol, decanol, undecanol, dodecanol, tridecanol is used.

The plastisol composition of the present invention is prepared by uniformly mixing the vinyl chloride paste resin and the above-mentioned plasticizer as the main components.

The phthalic acid polyester plasticizer tends to have a high viscosity by itself, and is used for the purpose of satisfying the fluidity of the plastisol composition, the plasticization efficiency of the vinyl chloride paste resin, and the flexibility of the molded product. It is also possible to replace some of the above with other plasticizers and use them together. In this case, for the purpose of satisfying the non-migrating property of the present invention, it is desirable to use a small amount of combined use. The combination plasticizer that can be used is not particularly limited as long as it can be used in a vinyl chloride paste resin, but examples thereof include di-n-butyl phthalate (DBP), di-n-octyl phthalate, and diphthalic acid. Phthalates such as 2-ethylhexyl (DOP), diisooctyl phthalate, octyldecyl phthalate, diisodecyl phthalate, butylbenzyl phthalate, octylbenzyl phthalate, di-2-ethylhexyl isophthalate, trioctyl trimellimer Trimellitic acid plasticizer such as tate, di-2-ethylhexyl adipate (DOA), di-n-decyl adipate, diisodecyl adipate, di-2-ethylhexyl azelate, dibutyl sebacate, di-2 sebacate -Fatty acid ester plasticizer such as ethylhexyl, tributyl phosphate, phosphate Phosphate ester plasticizers such as 2-ethylhexyl, 2-ethylhexyl diphenyl phosphate, tricresyl phosphate, epoxidized soybean oil, epoxidized linseed oil, epoxidized tall oil fatty acid-2-ethylhexyl, bisphenol A diglycidyl ether Examples thereof include epoxy plasticizers and resins, and these may be used alone or in combination of two or more.

The amount of the plasticizer used is appropriately selected depending on the desired solid content concentration of the plastisol composition, fluidity, etc., specifically, 30 to 400 parts by weight relative to 100 parts by weight of the vinyl chloride resin such as paste resin, It is preferably selected from the range of 50 to 200 parts by weight.

When the phthalic acid-based polyester plasticizer is used in combination with a general-purpose plasticizer, the proportion of the phthalic-acid-based polyester plasticizer used is preferably 30% or more of the total weight of the plasticizer. If it is less than 30%, the non-migration performance tends to be insufficient.

The plastisol composition of the present invention is a polyisocyanate-based compound, a polyisocyanate polymer, a polyaminoamide-based compound, an epoxy as an adhesiveness-imparting agent, so as to impart adhesiveness to the plastisol composition or to be used as an adhesive. System compounds, acrylic compounds, diallyl compounds and the like are mixed. Among these, polyisocyanate compounds and polyisocyanate polymers are most useful. The polyisocyanate-based compound is, for example, hexamethylene diisocyanate, fatty acid diisocyanate such as lysine diisocyanate, hydrogenated diphenylmethane diisocyanate, isophorone diisocyanate, alicyclic diisocyanate such as hydrogenated tolylene diisocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthylene diisocyanate. Examples thereof include aromatic diisocyanates such as isocyanate and xylene diisocyanate. Among these, aromatic diisocyanates, particularly tolylene diisocyanate and diphenylmethane diisocyanate are preferable. The polyisocyanate polymer is a polyisocyanate compound described above, for example, in an inactivating solution of ethyl acetate, methyl acetate, butyl acetate, methyl ethyl ketone, dioxane, chlorobenzene, or the like, or a phthalic acid ester, a phosphoric acid ester, or an adipic acid ester. Alternatively, it can be obtained by a known method in a plasticizer such as trimellitic acid ester using a well-known catalyst such as a tertiary amine, an alkali metal of Mannich base fatty acid, or an alcoholate.

As the polyisocyanate polymer used in the present invention, it is particularly preferable to use one containing an isocyanurate ring obtained by polymerizing a polyisocyanate compound. Those containing an isocyanurate ring are prepared according to the methods described above. Of course, the polyisocyanate polymer is obtained by reacting a polyisocyanate with an active hydrogen compound, a so-called isocyanate-terminated polyurethane,
Polyurea and the like can also be used. Then, -NCO of these polyisocyanate compounds and polyisocyanate polymers is usually blocked with a blocking agent such as phenol, but free NCO is contained so that the crosslinking reaction proceeds even at low temperature. It may have been done. The amount of the adhesiveness-imparting agent added is preferably in the range of 1 to 25 parts by weight per 100 parts by weight of the vinyl chloride polymer, and the effective NCO in the plastisol composition is 0.03 to 1% by weight, preferably
It is desirable to be present in the range of 0.03 to 0.6% by weight, especially 0.05 to 0.5% by weight.

As the polyamide-based compound, a commercially available product, for example, trade name Oiltech 505, Oiltech 506 (manufactured by Schering Co.), similarly as the epoxy compound, tradename Epicoat 828 (manufactured by Shell Chemical Co.), and as the acrylic compound, tri compound As the diallyl-based compound, diallyl phthalate or the like is used together with a slight amount of methylolpropane trimethacrylate peroxide. These adhesiveness-imparting agents are used in appropriate amounts in consideration of suitability as an undercoating agent and adhesiveness to an adherend such as a polyester film.

Stabilizers are generally added to the plastisol composition of the present invention. Stabilizers that can be used include lead white, basic lead silicate, tribasic lead sulfate, tribasic lead phosphite, silica gel co-precipitated lead silicate, inorganic metal compounds such as zinc white, lauric acid, stearin. Acid, ricinoleic acid, naphthenic acid, salicylic acid, cadmium such as 2-ethylhexoic acid fatty acid or resin acid, barium, calcium, zinc, lead, organic compounds such as metal salts of lead, tin or magnesium, and zinc octylate, Dibutyltin laurate,
Dioctyl tin malate, dibutyl tin mercaptide and the like can be mentioned. In addition, organic acid liquid composite stabilizers such as calcium-zinc type, barium-zinc type, magnesium-zinc type, and cadmium-barium-zinc type stabilizers which are commercially available as stabilizers for vinyl chloride resins can also be used.
Although the amount of addition is not particularly limited, the object can be achieved with 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the vinyl chloride paste resin.

In addition to the above components, various other additives such as a filler, a thickener, a diluent, a colorant, a dissociation accelerator and the like can be added to the plastisol composition of the present invention. Of course, other additives are not limited to these. Examples of the fillers include inorganic fillers such as light or heavy calcium carbonate, talc, diatomaceous earth, kaolin, and clay, or cellulose powder, liquid or powder rubber such as nitrile butadiene, and organic fillers such as recycled rubber. The thickener may be anhydrous silica, organic bentonite, or metallic soap. As the diluent, mineral spirits, texanol isobutyrate, dodecylbenzene, or an organic solvent such as toluene or xylene can be used, and an appropriate addition amount depending on the desired solid content concentration and fluidity of the paste sol. decide.

The plastisol composition of the present invention is produced by uniformly mixing a vinyl chloride paste resin, a phthalic acid polyester plasticizer and, if necessary, an adhesiveness-imparting agent, and other additives in predetermined amounts by a conventional method. It

The plastisol composition of the present invention is used as an undercoating agent for various industries, a base hardening agent, an adhesive and the like.

The undercoating agent comprising the plastisol composition of the present invention is, for example, for the purpose of rust prevention on the cationic electrodeposition-coated surface or before flying pebbles before the topcoating is applied to the car body that has been subjected to cationic electrodeposition coating in the automobile industry. It is applied for the purpose of buffering the contact of the like, and for the purpose of sealing the pinhole. After the undercoating agent is applied, before the undercoating agent adheres to the cationic electrodeposition coated surface, a topcoating agent such as polyester resin coating, alkyd resin coating, melamine alkyd coating, epoxy resin coating, acrylic resin coating is applied. Then, by heating, the undercoating agent and the topcoating agent are simultaneously solidified, fixed and baked.

Further, the plastisol composition of the present invention is used as an adhesive for nylon-based fibers or woven fabrics, polyester-based fibers or woven fabrics, natural leather, nylon, synthetic resin sheets or films including nylon, metal plates or metal foils, etc. It can be used effectively.

The undercoating agent and the adhesive are applied to the substrate by, for example, a reverse roll, a knife coater, a spray, a curtain flow,
Various methods such as dip coating, rotary screen, flat screen, flexo, gravure printing, gun discharge method, brush coating and pouring are adopted.

[Effects of the Invention] The plastisol composition of the present invention has excellent low-temperature meltability and equal or higher oil resistance than a plastisol composition using a trimellitic acid ester plasticizer or an adipic acid polyester plasticizer. It is also excellent in storage stability of sol viscosity.

Therefore, if the plastisol composition of the present invention is used in a complicated processing step in various industrial fields, particularly in a processing field to which a coating step of a top coating is added, the plasticizer does not migrate to the top coating, and the plastisol composition itself is at a low temperature. Since it is melted and gelled, the plastisol composition and the topcoat paint can be fixed at the same time, which contributes to shortening the process. For example, when the plastisol composition is applied as an undercoating agent for automobile bodies, the finish (for example, smoothness and gloss) of the topcoating material during wet-on-wet processing is good, and the undercoating material having high physical properties is obtained despite the low temperature melting condition. A layer is obtained.

Further, the plastisol composition of the present invention has excellent peeling strength, tensile strength, etc., and is used as a laminating resin for a resist or masking strippable material for coating a conductor of a flexible printed circuit, or as a raw material for forming gloves. High value.

[Examples] Next, the present invention will be described by way of examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

The evaluation method of the plastisol composition or molded article in the examples is as follows.

(1) Viscosity and storage stability of plastisol composition Initial: Using a B8H type viscometer (# 6 or # 7 rotor manufactured by Tokyo Keiki Co., Ltd.), a viscosity of 5 rpm at a sol temperature of 23 ± 1 ° C. was measured.

After aging: The sol composition was left in a constant temperature bath at 40 ° C for 7 days, then left at room temperature of 23 ± 1 ° C for 1 day, and stirred for 2 minutes before the viscosity measurement with a stirrer for 1 minute. It measured in the same way as the initial viscosity measuring method.

Storage stability: The increase rate of the viscosity after aging with respect to the initial viscosity (after aging / initial) is shown.

(2) Melt property test Release the plastisol composition with release paper (made of special pattern paper, S-KLPG4B
-T) was applied with a knife coater to a thickness of about 1.0 mm and then heated at 120 ° C, 140 ° C and 160 ° C for 10 minutes in a circulating dryer to obtain a molded sheet.

The molded sheet was subjected to a tensile test according to JIS K-6723.

(3) Resistance (surfactant, solvent) extractability test After coating the plastisol composition with a thickness of about 1.0 mm on release paper, heat it at 140 ° C for 30 minutes to obtain a molded sheet, and test it with a size of 40 mm x 40 mm. Cut into pieces.

The test piece was allowed to stand in a desiccator at 23 ° C. for 24 hours before the test, and after measuring the initial weight, it was placed in an extraction solution described in a separate table at 23 ° C., 24
Soak for hours.

After taking out, the surface was wiped gently and dried in a dryer at 80 ° C. for 4 hours to remove the absorbed extract.

Then, the mixture was cooled to 23 ° C. in a desiccator and weighed again to determine the loss (%) of the plasticizer extracted by the extract.

Example-1 (Production of phthalic acid-based polyester plasticizer-1) 2.0 mol of phthalic anhydride was added to a four-necked flask equipped with a stirrer, a thermometer, a fractionating pipe, a cooling pipe, and a gas introduction pipe. 4-
Butylene glycol 1.1 mol, 2-ethylhexanol
2.4 mol and 0.3 gr of dibutyltin oxide as a catalyst were added.

The reaction system was replaced with N ₂ and the temperature was raised to 220 ° C. in 6 hours, and the reaction was continued for another 2 hours while distilling generated water out of the system at this temperature. During this time, the pressure inside the system was reduced to promote the reaction, the degree of reduced pressure was gradually increased to finally reach 5 mmHg, and then the reaction was carried out for 3 hours. During this period, excess components were distilled off.

After cooling to 100 ° C., Mg (OH) ₂ and 0.5 gr were added, and the mixture was stirred for 30 minutes and then passed. Molecular weight 610 (n≈1), solution viscosity at 25 ° C about 950c.ps, acid value = 0.12mgKOH / gr. Hydroxyl value =
1.3 mg KOH / gr. Of phthalic acid polyester was obtained.

(Preparation of Plastisol Composition-1) Using the phthalic acid-based polyester plasticizer obtained above, Plastisol Composition-1 was prepared with the following standard formulation and evaluated.

Paste resin 100 parts by weight (P-540, average degree of polymerization 1500, Homo-polymer (manufactured by Mitsubishi Kasei Vinyl Co., Ltd.)) Phthalic acid polyester plasticizer 60〃 Octyl tin mercaptide 2〃 (stabilizer) Plastisol composition -1 was prepared using a Hobart mixer (N-50) and weighed under a constant temperature and humidity of 23 ° C and 50% RH.
Compounded.

 The evaluation results are shown in Table-1.

Example-2 (Production of phthalic acid-based polyester plasticizer-2) 2.0 mol of phthalic anhydride, 1,4 in a four-necked flask equipped with a stirrer, thermometer, fractionating pipe, cooling pipe, gas introduction pipe 1.3 mol of butylene glycol, 2.2 mol of isononyl alcohol and 0.05 ml of tetraisopropyl titanate as a catalyst were added.

Thereafter, the molecular weight is 748 (n≈1.5) in the same manner as in Example-1.
Solution viscosity at 25 ℃ is about 2000c.ps, Acid value = 0.10mgKOH / gr.
A phthalic acid-based polyester having a hydroxyl value of 1.6 mgKOH / gr. Was obtained.

(Preparation of Plastisol Composition-2) Using the obtained phthalic acid-based polyester, Example-1
Plastisol composition-2 was prepared with the same standard formulation as in.

 The evaluation results are also shown in Table-1.

Comparative Examples-1, -2, -3, -5, -6 Among the compounding components of the plastisol composition of Example-1, commercially available di-2-ethylhexyl phthalate (DOP) and trioctyl phthalate polyester plasticizers were used. Trimellitate (TOTM), adipic acid polyester (D-621 manufactured by Mitsubishi Kasei Vinyl Co., Ltd.), and phthalate having a molecular weight of 455 (n≈0.3) and 1000 (n≈2.8) obtained in the same manner as in Example 1. The results of evaluation in the same manner as in the examples, substituting the acid-based polyester plasticizer, are also shown in Table-1.

From the results in Table-1, the plastisol composition using the phthalic acid-based polyester plasticizer shows that the storage stability of the sol is higher than that of the DOP, TOTM-based plasticizer and the phthalic-acid-based polyester plasticizers having a molecular weight other than 600 to 750. It can be seen that the tensile properties and solvent resistance during low temperature molding are excellent. Further, Comparative Example 3 using D-621, which is an adipic acid-based polyester plasticizer, has extremely poor tensile properties during low-temperature molding, and practical mechanical properties may not be satisfied under molding or baking conditions of 140 ° C or lower. I understand.

Examples 3, 4, Comparative Examples 4, 7, 8 A plastisol composition having the following composition was prepared, and the performance as an undercoating agent was evaluated by applying an overcoating composition.

Comparative Examples 7 and 8 Molecular weight of 455 as phthalic acid type polyester plasticizer (used in Comparative Example 5; Comparative Example 7), molecular weight of 1,00
Evaluations were made in the same manner as in Example 4 except that 0 (the one used in Comparative Example 6; Comparative Example 8) was used.

<Evaluation method of top coating> A plastisol composition is knife-coated on a cationic electrodeposition plate to a thickness of 1.0 mm, and a melamine alkyd resin solvent-based coating is sprayed thereon with a thickness of about 30 μm (wet-on-wet). Painted). Then ambient temperature 140
After baking and drying at 20 ° C. for 20 minutes, the coatability, gloss, and cured state of the film of the topcoat paint were judged, and the suitability of the plastisol composition as an undercoating agent was evaluated.

Paintability: Visually check for unevenness of the top-coat paint and cissing (where there is no top-coat paint) Gloss: Visually check for uneven gloss of the top-coat paint surface Film hardness: Hardness by touching the top-coat paint film with fingers and nails Judge Examples 3 and 4 using a plastisol composition in which a phthalic acid polyester plasticizer and DOP are used in combination as an undercoat,
It was found that the topcoating performance was extremely excellent as compared with Comparative Example 4 or Comparative Example 7 in which a plastisol composition using DOP alone or a phthalic acid polyester plasticizer having a molecular weight of 455 was used as an undercoating agent, and wet-on- It can be used directly in the wet coating method and is found to be suitable as a primer for automobiles, for example.

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Claims (3)

[Claims] 1. A plastisol composition comprising a vinyl chloride paste resin and a phthalic acid polyester plasticizer having a molecular weight of 600 to 750 represented by the following general formula as a main component. During AP-G _n P-A (wherein, P is, o- phthalic acid, the residue G of isophthalic acid or terephthalic acid, ethylene glycol, diethylene glycol, 1,
2-propylene glycol, 1,2-butylene glycol,
1,3-butylene glycol, 1,4-butylene glycol,
Neopentyl glycol, 1,5-pentanediol, 3
-Residue of one or more alcohols selected from methyl-1,5-pentanediol and 1,6-hexanediol A is a residue of a monohydric alcohol having 4 to 13 carbon atoms, each of which is- It is bound by a COO- group. n is the average weight (contraction) degree and is a positive number in the range of 1-2. ) 2. The plastisol composition according to claim 1, which contains a polyisocyanate compound, a polyisocyanate polymer, a polyamide compound, an epoxy compound, an acrylic compound or a diallyl compound. 3. An undercoating agent comprising the plastisol composition according to claim 1 or 2.