JP2021102680A - Vinyl chloride based resin for paste processing and vinyl chloride based resin composition for paste processing using the same - Google Patents

Abstract

To provide a vinyl chloride based resin for paste processing, capable of providing a foam high in foaming magnification, excellent in chemical embossing properties and excellent in thermal stability, and a new vinyl chloride based resin composition for paste processing, obtained by the vinyl chloride based resin for paste processing.SOLUTION: A vinyl chloride based resin for paste processing includes water-soluble organic acid of 150-500 ppm to a vinyl chloride based resin, and a vinyl chloride based resin composition for paste processing is obtained by the vinyl chloride based resin for paste processing.SELECTED DRAWING: None

Description

The present invention relates to a vinyl chloride resin for paste processing (hereinafter, may be abbreviated as paste vinyl chloride) and a paste vinyl chloride composition obtained from the resin, and more specifically, the foaming ratio is high and the chemical embossing property is good. The present invention relates to a paste vinyl chloride that gives a plastic sol capable of obtaining a foam having excellent thermal stability, and a paste vinyl chloride composition obtained from the paste vinyl chloride.

The paste PVC is generally processed as a paste PVC by kneading with a compounding agent such as a plasticizer, a stabilizer, and a foaming agent, and various molded products can be obtained by various processing methods. Among them, building materials such as wallpaper, flooring and foam sheets are one of the main uses of paste PVC.

Generally, for wallpaper, flooring materials, foam sheets, etc., a process of creating an original fabric by applying paste PVC sol to a backing material such as flame-retardant paper and heating it, a printing process of coloring the original fabric by gravure printing, etc., a printed original It is manufactured by a method consisting of a foaming process of heating and foaming the fabric and an embossing process of attaching a handle to the foam.

In the foaming step of controlling the thickness of the product at that time, if a foam having a high magnification can be obtained, the coating thickness of the raw material can be reduced and the amount of paste vinyl chloride used can be reduced. Therefore, from the viewpoint of reducing the environmental load and the manufacturing cost, a paste vinyl chloride sol capable of obtaining a foam having a high magnification is desired.

Further, the embossing method is roughly classified into a chemical embossing method in which a pattern is attached by applying an inhibitory ink that suppresses decomposition of a foaming agent, and a mechanical embossing method using an embossing roll. In the chemical embossing method, the larger the difference in unevenness between the foamed portion and the foaming suppressing portion, the better the design property. Therefore, a paste vinyl chloride solution having a good foaming suppressing effect of the suppressing ink coating portion is desired.

If the obtained foam is colored, the appearance of the product deteriorates. Therefore, a paste vinyl chloride sol with less coloring is desired. Coloring of the foam occurs when the foaming agent is sufficiently decomposed and when the vinyl chloride resin is thermally decomposed. Since azodicarbonamide itself, the most commonly used organic foaming agent, is yellow, the product will be colored yellow if the foaming agent is not sufficiently decomposed. In addition, when the temperature of vinyl chloride resin reaches 170 to 180 ° C, chlorine and hydrogen in the molecule are desorbed and hydrogen chloride is generated remarkably, and once decomposed, an unstable part is formed in the molecular structure, so that hydrogen chloride is desorbed. Separation is promoted and decomposition proceeds in a chain reaction. There is a method of raising the heating temperature and lengthening the heating time in order to suppress coloring by the undecomposed foaming agent, but there is a problem that coloring by thermal decomposition of the vinyl chloride resin by heating progresses. Especially in applications such as flooring materials and foam sheets, the coating thickness of the raw material is thick, the heating time in the foaming process becomes long, the vinyl chloride resin is decomposed by heating, and the hue of the product deteriorates, so it is thermally stable. A paste vinyl chloride composition capable of obtaining a foam having excellent properties and a paste vinyl chloride composition comprising the same are desired.

For example, in Patent Document 1, in order to provide a vinyl chloride-based resin exhibiting excellent chemical embossing properties, a production method characterized by adjusting the pH of an aqueous dispersion of a paste vinyl chloride resin and a blended resin within a specific range. Has been proposed.

Further, Patent Document 2 is printed on a base material layer made of a vinyl chloride resin composition for chemical embossing containing a paste vinyl chloride resin, a plasticizer, a chemical foaming agent, zinc oxide, and a foaming inhibitor, and its surface. A vinyl chloride resin sheet having excellent chemical embossing properties, which is composed of an ink layer containing a foaming inhibitor, has been proposed.

Japanese Patent No. 3576351 Japanese Unexamined Patent Publication No. 2006-272804

The paste PVC resin obtained by adjusting the pH of the aqueous dispersion proposed in Patent Document 1 within a specific range shows a good chemical embossing property with a foaming suppression rate of about 35 to 45%, but is even higher. It is difficult to meet the demand for chemical embossing.

Further, the resin compositions proposed in Patent Documents 1 and 2 are intended to improve the chemical embossing property when foamed, and no consideration is given to the thermal stability of the foam. is there.

Therefore, the present invention solves these problems and obtains a paste PVC that can provide a foam having a high foaming ratio, good chemical embossing property, and excellent thermal stability, which cannot be obtained by a conventional paste PVC, and more. It is an object of the present invention to provide a novel paste PVC composition to be obtained.

As a result of diligent studies in view of the above problems, the present inventor provides a foam in which a paste PVC containing a specific amount of a water-soluble organic acid has a high foaming ratio, good chemical embossing property, and excellent thermal stability. We have found that we can obtain it, and have completed the present invention.

That is, the present invention relates to a paste vinyl chloride characterized by containing 150 to 500 ppm of a water-soluble organic acid with respect to a vinyl chloride resin, and a paste vinyl chloride composition containing the same.

Hereinafter, the present invention will be described in detail.

The paste vinyl chloride of the present invention contains 150 to 500 ppm of a water-soluble organic acid with respect to a vinyl chloride resin, and is preferably 200 to 500 ppm because it can provide a plastisol having particularly excellent chemical embossing properties. It is preferably 250 to 500 ppm. Here, when the content of the water-soluble organic acid is less than 150 ppm, the effect of improving the chemical embossing property when the foam is formed is not exhibited. On the other hand, if it exceeds 500 ppm, the foaming ratio and thermal stability of the foam will decrease.

Here, the water-soluble organic acid may be any organic acid exhibiting solubility in an aqueous medium, for example, acetic acid, chloroacetic acid, dichloroacetic acid, trichloroacetic acid, nicotinic acid, benzenesulfonic acid, benzoic acid, tartaric acid, malic acid. , Formic acid, butyric acid, citric acid, succinic acid, oxalic acid, picric acid, picolin acid, phthalic acid, sulfamic acid, aspartic acid, glycolic acid, glutamate acid, fumaric acid, maleic acid, malonic acid, lactic acid, oleic acid, erythorbic acid , Ascorbic acid and the like, and in particular, those having four or more hydroxy groups and one or more ester groups in the molecule are preferable. In addition, these are used alone or in combination of two or more.

Examples of the vinyl chloride-based resin constituting the paste vinyl chloride of the present invention include vinyl chloride homopolymerization resin and vinyl chloride copolymerization resin, and examples of the monomer copolymerizable with the vinyl chloride monomer include vinyl acetate. , Vinyl esters such as vinyl propionate, vinyl myristate, vinyl benzoate; unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, fumaric acid or anhydrides thereof; methyl acrylate, ethyl acrylate, acrylic acid Acrylic acid esters such as butyl; methacrylate esters such as methyl methacrylate, ethyl methacrylate and butyl methacrylate; unsaturated carboxylic acid esters such as maleic acid ester, fumaric acid ester and cinnamic acid ester; vinyl methyl ether , Vinyl ethers such as vinyl amyl ether and vinyl phenyl ether; monoolefins such as ethylene, propylene, butene and penten; vinylidene chloride, styrene and derivatives thereof; It may be the one obtained by copolymerizing more than one kind. The degree of polymerization is preferably 1000 to 1500, and more preferably 1100 to 1400, because it is possible to provide a paste PVC composition having excellent chemical embossing property and high foaming ratio, which makes the unevenness clear.

The paste PVC of the present invention produces paste PVC such as a polymerization initiator, an emulsifier, an emulsifying aid, a buffer, a higher alcohol, a higher fatty acid, a higher fatty acid ester, a dispersion aid such as chlorinated paraffin, and a degree of polymerization adjusting agent. It may contain a substance or the like that is generally added at the time. Further, as a method for producing the paste PVC, general methods such as an emulsification polymerization method, a microsuspension polymerization method, a seed emulsification polymerization method, and a seed microsuspension polymerization method can be mentioned, and the chloride obtained by these polymerization methods can be mentioned. It can be produced as a paste PVC by removing water from the vinyl-based resin latex.

Examples of the method for removing water from the vinyl chloride resin latex include spray drying, fluidized bed drying, aeration drying, rotary drying, conduction heating drying, and the like. Among them, spray drying is possible because water can be removed efficiently. The drying method is preferable.

Below, the seed microsuspension polymerization method is shown as an example of the method of obtaining the vinyl chloride resin latex used for making the paste vinyl chloride of the present invention.

The seed microsuspension polymerization method is the first step of 1) obtaining a vinyl chloride resin seed latex containing a vinyl chloride resin containing an oil-soluble polymerization initiator by the microsuspension polymerization method, and 2) the obtained seed latex. The vinyl chloride monomer or the vinyl chloride monomer and the monomer copolymerizable therewith are polymerized with gentle stirring in the presence of deionized water, an emulsifier, a buffer, and if necessary, an emulsifying aid such as a higher alcohol. This is a polymerization method consisting of a second step of bloating the seed latex to obtain a vinyl chloride resin latex.

Here, examples of the monomer monomer copolymerizable with the vinyl chloride monomer include those described above.

Examples of the emulsifier include alkyl sulfate esters such as sodium lauryl sulfate and myristyl sulfate; alkylaryl sulfonates such as sodium dodecylbenzene sulfonate and potassium dodecylbenzene sulfonate; sodium dioctyl sulfosuccinate and dihexyl sulfosuccinic acid. Sulfosuccinates such as sodium; fatty acid salts such as ammonium laurate and potassium stearate; anionic emulsifiers such as polyoxyethylene alkyl sulfate esters and polyoxyethylene alkylaryl sulfates: sorbitan monooleate, polyoxyethylene sorbitan mono One or more conventionally known sorbitan esters such as stearate; polyoxyethylene alkylphenyl ethers; nonionic emulsifiers such as polyoxyethylene alkyl esters can be used.

Examples of the buffer include an alkali metal monohydrogen phosphate salt, an alkali metal dihydrogen phosphate salt, potassium hydrogen phthalate, sodium hydrogen carbonate, and a boric acid-potassium caustic solution.

Examples of the emulsifying aid used as needed include higher alcohols such as cetyl alcohol and lauryl alcohol; higher fatty acids such as lauric acid, palmitic acid and stearic acid; and esters thereof; aromatic hydrocarbons and higher fatty acid hydrocarbons. Examples thereof include halogenated hydrocarbons such as chlorinated paraffin.

The vinyl chloride resin seed latex containing the oil-soluble polymerization initiator used in the seed microsuspension polymerization method can be prepared by the following microsuspension polymerization method. First, a vinyl chloride monomer, an oil-soluble polymerization initiator, a surfactant, a buffer, a higher alcohol, a higher fatty acid, a higher fatty acid ester, a dispersion aid such as chlorinated paraffin, and a degree of polymerization adjusting agent are added as necessary. Premix and homogenize with a homogenizer to prepare oil droplets. As the homogenizer at this time, for example, a colloid mill, a vibration stirrer, a two-stage high-pressure pump, or the like can be used. Then, the homogenized liquid is sent to the polymerizer, the temperature inside the polymerizer is raised while gently stirring, the polymerization reaction is started, and the polymerization is carried out until a predetermined conversion rate is reached to obtain an oil-soluble polymerization initiator. It is possible to prepare the seed latex to be contained.

As the oil-soluble polymerization initiator, a diacyl peroxide having a 10-hour half-life temperature of 30 to 70 ° C. is preferable, and examples of such a polymerization initiator include isobutyryl peroxide and 3,3,5-trimethylhexanoylper. Examples thereof include oxides, octanoyl peroxides, lauroyl peroxides, stearoyl peroxides, and succinic acid peroxides.

Then, in the step 2), the obtained vinyl chloride resin seed latex containing the oil-soluble polymerization initiator is enlarged in the presence of a vinyl chloride monomer or the like, and polymerized to obtain a vinyl chloride resin latex. It is possible to do.

The paste vinyl chloride of the present invention can be obtained by preparing a vinyl chloride resin latex by these methods, adjusting the content of the water-soluble organic acid (addition of the water-soluble organic acid, etc.), and treating the paste with a spray dryer or the like. ..

The paste PVC of the present invention can be used for various purposes as a paste PVC composition by blending a plasticizer, a filler, a foaming agent and the like. In that case, since the composition has excellent properties, it is preferable that the paste contains 20 to 200 parts by weight of the plasticizer with respect to 100 parts by weight of the vinyl chloride, and particularly when it is made into a foam, the paste is used. It shall contain 20 to 200 parts by weight of a plasticizer, 1 to 300 parts by weight of a filler, 0.1 to 30 parts by weight of a foaming agent, and 0.1 to 30 parts by weight of a stabilizer with respect to 100 parts by weight of vinyl chloride. Is preferable.

Examples of the plasticizer include phthalates such as bis (2-ethylhexyl) phthalate (sometimes abbreviated as DOP), diisononyl phthalate, diisodecyl phthalate, and dibutyl phthalate; adipic acid (2-ethylhexyl). , Adiponic acid esters such as diisononyl adipate; Trimellitic acid esters such as triisodecyl trimellitic acid (2-ethylhexyl), triisodecyl trimellitic acid, trinormal octyl trimellitic acid; tri-ethyl phosphate (2-ethylhexyl), phosphorus Phosphate esters such as tricresyl acid and trixylenyl phosphate; benzoic acid esters such as diethylene glycol dibenzoate and dipropylene glycol dibenzoate; other polyester plasticizers, sebacic acid esters, magellaic acid esters, maleic acid esters, epoxidized vegetable oils, etc. , Which is generally used as a plasticizer can be used.

Examples of the filler include calcium carbonate, diatomaceous earth, magnesium carbonate, titanium oxide and the like.

Examples of the foaming agent include inorganic foaming agents such as sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, ammonium nitrite, amide compounds and sodium bohydride; isocyanate compounds, azodicarboxylic amides, azobisisobutyronitrile and barium. Azo compounds such as azodicarboxylate; hydrazine derivatives such as p, p'-oxybisbenzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide; nitroso compounds such as semicarbazide compounds, azi compounds, dinitrosopentamethylenetetramine; triazole compounds and the like Examples include organic foaming agents. Then, if necessary, the above-mentioned foaming agent and a decomposition accelerator such as zinc oxide (zinc oxide) can be used in combination.

Examples of the stabilizer include an epoxy-based stabilizer, a barium-based stabilizer, a calcium-based stabilizer, a tin-based stabilizer, a zinc-based stabilizer, and the like. In addition, commercially available composite stabilizers such as calcium-zinc type and barium-zinc type can also be used.

Further, when the paste PVC composition is prepared, additives usually added to the paste PVC composition within a range not exceeding the object of the present invention, for example, an antioxidant, a flame retardant, a diluent, a lubricant, and an ultraviolet absorber. , Colorants such as pigments, surfactants, antistatic agents and the like may be added, and the blending amounts thereof may be within the range generally used.

The paste PVC of the present invention can provide a foam having a high foaming ratio, good chemical embossing property, and excellent thermal stability, and its industrial value is very high.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

The evaluation method of the paste PVC, the composition, and the foam obtained from Examples is shown below.

<Average particle size>
Using a laser diffraction / scattering particle size distribution measuring device (HORIBA, Ltd., (trade name) LA-920), the average particle size was determined by measuring twice under the condition of a refractive index of 1.16.

<Degree of polymerization>
The degree of polymerization was calculated by the solution viscosity measurement method using a JIS K6721 Ubbelohde viscometer.

<Effervescence magnification>
The foaming ratio was calculated by the following formula (1).
Foaming ratio = thickness of foam / thickness of raw fabric (1)
Since the design of the wallpaper and the floor material is excellent, it was judged that the foaming ratio of 4.0 times or more is excellent in the foaming property.

<Chemical embossing>
Trimellitic anhydride was applied to the obtained raw fabric as an inhibitory ink, foaming was performed at 200 ° C. for 170 seconds, and the difference in unevenness due to chemical embossing was measured. The suppression ratio was calculated by the following equation (2).
Suppression ratio = unevenness difference / foam thickness x 100 (2)
Since the design of the wallpaper and flooring is excellent, it was judged that the material having an suppression ratio of 50.0% or more is excellent in chemical embossing.

<Foam hue>
The YI value of the obtained foam was measured using a color difference meter (Konica Minolta Co., Ltd., (trade name) CR-5). Generally, the smaller the YI value, the closer to white, so it was judged that those with a hue of 25 or less were excellent in hue.

Synthesis Example 1 (Preparation of vinyl chloride resin seed latex containing oil-soluble polymerization initiator)
360 kg of deionized water, 300 kg of vinyl chloride monomer, 5.7 kg of lauroyl peroxide and 30 kg of 15 wt% sodium dodecylbenzene sulfonate aqueous solution were charged in a 1 m ^{3 stainless steel autoclave, and the polymer solution was circulated for 3 hours using a homogenizer to homogenize.} After the chemical treatment, the temperature of the reaction system was raised to 45 ° C. to initiate polymerization. After the pressure of the polymerization system was lowered, the unreacted vinyl chloride monomer was recovered to obtain an oil-soluble vinyl chloride resin seed latex (a) having a solid content of 35% by weight and an average particle size of 0.55 μm and containing an oil-soluble polymerization initiator. ..

Production Example 1 (Vinyl chloride resin latex)
In a 2.5 L stainless steel autoclave, 500 g of deionized water, 800 g of vinyl chloride monomer, 16.5 g of 5 wt% sodium lauryl sulfate, 10.6 g of a 1 wt% borate-caustic potassium solution, and average particles obtained by Synthesis Example 1. 86.9 g of vinyl chloride resin seed latex (a) containing an oil-soluble polymerization initiator having a diameter of 0.55 μm and 4.0 g of 0.1 wt% copper sulfate were charged, and the temperature of this reaction mixture was raised to 55 ° C. for polymerization. Started. During the polymerization, 160 g of a 0.05 wt% erythorbic acid aqueous solution was continuously added so as to maintain the polymerization temperature, and the polymerization pressure was reduced to 0.471 MPa from the saturated vapor pressure of the vinyl chloride monomer at 55 ° C. Was finished. The amount of erythorbic acid added during the polymerization was 100 ppm with respect to the vinyl chloride resin. From the start of the polymerization to the end of the polymerization, 104.8 g of 5 wt% sodium lauryl sulfate was continuously added. After completion of the polymerization, the unreacted vinyl chloride monomer was recovered to obtain a vinyl chloride resin latex. The vinyl chloride resin in the obtained vinyl chloride resin latex contained a vinyl chloride resin having an average particle size of 1.1 μm and an average degree of polymerization of 1200.

Example 1
To 1 kg of the vinyl chloride resin latex (average particle size: 1.1 μm, degree of polymerization: 1200) obtained in Production Example 1, a 1 wt% aqueous solution of erythorbic acid was added so that the amount of erythorbic acid was 50 ppm with respect to the vinyl chloride resin. The mixture was added and spray-dried at a hot air temperature of 158 ° C. and an outlet temperature of 55 ° C. using a rotary disk type spray dryer. The granular paste PVC obtained by drying was pulverized to obtain a fine powder paste PVC. The obtained paste PVC contained 150 ppm of erythorbic acid with respect to the vinyl chloride resin.

With respect to 100 parts by weight of the obtained paste PVC, 56 parts by weight of DOP (manufactured by Daihachi Chemical Industry Co., Ltd.) as a plasticizer and calcium carbonate (Nitto Powder Industry Co., Ltd., (trade name) NN # 500) as a filler. ) 35 parts by weight, titanium oxide (Taika Corporation, (trade name) JR600A) 5 parts by weight, foaming agent (Otsuka Chemical Co., Ltd., (trade name) AZ Ultra 1050) 2 parts by weight, zinc oxide 1 weight 3 parts by weight (Daiko Kasei Co., Ltd., (trade name) MZ-100), epoxy plasticizer (ADEKA Co., Ltd., (trade name) ADEKA Sizer O-130P), and kneading using a dissolver. , A paste PVC composition was obtained.

The obtained paste PVC composition was coated on flame-retardant paper previously heated at 180 ° C. for 5 seconds to a thickness of 0.35 mm, and heated at 180 ° C. for 12 seconds to obtain an original fabric. After measuring the thickness of the obtained raw fabric, a suppressive ink (trimellitic anhydride) was applied using a gravure printing machine, and the foam was heated at 200 ° C. for a predetermined time to obtain an embossed foam.

The obtained embossed foam had a foaming ratio of 4.3 times, an suppression ratio of 54%, and a hue of YI value of 18.7, which were excellent as chemical embossed foams. The evaluation results are shown in Table 1.

Example 2
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 100 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 200 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 4.3 times, an suppression ratio of 58%, and a hue of YI value of 18.4, which were excellent as chemical embossed foams. The evaluation results are shown in Table 1.

Example 3
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 150 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 250 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 4.3 times, an suppression ratio of 62%, and a hue of YI value of 19.3, which were excellent as chemical embossed foams. The evaluation results are shown in Table 1.

Example 4
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 200 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 300 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 4.3 times, an suppression ratio of 65%, and a hue of YI value of 20.8, which were excellent as chemical embossed foams. The evaluation results are shown in Table 1.

Example 5
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 400 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 500 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 4.1 times, an suppression ratio of 65%, and a hue of YI value of 21.6, which were excellent as chemical embossed foams. The evaluation results are shown in Table 1.

Comparative Example 1
A paste PVC, a paste PVC composition, and a foam were obtained by the same method as in Example 1 except that erythorbic acid was not added after the polymerization.

The obtained paste PVC contained 100 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 4.3 times, an suppression ratio of 49%, and a hue of YI value of 17.9, which were inferior in chemical embossing property. The evaluation results are shown in Table 2.

Comparative Example 2
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 600 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 700 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 3.2 times, an inhibition ratio of 46%, and a hue of YI value of 23.6, which were inferior in foamability and chemical embossing. The evaluation results are shown in Table 2.

Comparative Example 3
A paste vinyl chloride, a paste vinyl chloride composition, and a foam were obtained by the same method as in Example 1 except that 800 ppm of erythorbic acid was added to the vinyl chloride resin instead of 50 ppm of erythorbic acid added to the vinyl chloride resin. It was.

The obtained paste PVC contained 900 ppm of erythorbic acid with respect to the vinyl chloride resin. Further, the obtained embossed foam had a foaming ratio of 1.8 times, an suppression ratio of 14%, and a hue of YI value of 26.0, which were inferior in foamability, chemical embossing, and hue. .. The evaluation results are shown in Table 2.

The paste PVC of the present invention can provide a foam having a high foaming ratio, good chemical embossing property, and excellent thermal stability, and is particularly excellent as a building material such as wallpaper, flooring material, and foamed sheet. And its industrial utility value is high.

Claims (6)

A vinyl chloride-based resin for paste processing, which contains 150 to 500 ppm of a water-soluble organic acid with respect to a vinyl chloride-based resin. The vinyl chloride resin for paste processing according to claim 1, wherein the vinyl chloride resin has a degree of polymerization of 1000 to 1500. The method for producing a vinyl chloride resin for paste processing according to claim 1 or 2, wherein a water-soluble organic acid is added to the vinyl chloride resin latex after the polymerization reaction of the vinyl chloride monomer and spray-dried. .. A vinyl chloride resin composition for paste processing, which comprises 20 to 200 parts by weight of a plasticizer with respect to 100 parts by weight of the vinyl chloride resin for paste processing according to claim 1 or 2. The vinyl chloride resin composition for paste processing according to claim 4, further comprising 1 to 300 parts by weight of a filler and 0.1 to 30 parts by weight of a stabilizer. The vinyl chloride resin composition for paste processing according to claim 4 or 5, which is for a chemical embossed flooring material.