JPS6286043A - Vinyl chloride resin plastisol composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent thermal stability and whitening due to water absorption, consisting of a specified vinyl chloride paste resin, a coupling-treated hydrotalcite and a liquid composite stabilizer contg. no alkali metal or an organotin stabilizer. CONSTITUTION:Viayl chloride, either alone or together with a copolymerizable monomer, is emulsion-polymerized in the presence of 0.3-1.0wt% 8-20C fatty acid emulsifier and a water-soluble polymn. initiator (e.g., azobisisobutyronitrile) in an aq. medium to obtain a vinyl chloride paste resin having an alkali metal content of 500ppm or below. 100pts.wt. said resin is blended with 0.1-0.5pts.wt. lydrotalcite which has a BET specific surface area of 30m<2>/g or below and has previously been coupling-treated with 0.001-0.5pts.wt. acetoalkoxy aluminum diisopropylates and 0.1-5.0pts.wt. liquid composite stabilizer contg. no alkali metal (e.g., Mg/Zn system) or organotin stabilizer (e.g. dibutyltin laurate).

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Object of the Invention The present invention relates to a vinyl chloride resin plastisol composition that provides a vinyl chloride resin product with improved water absorption whitening properties and thermal stability.

(Industrial Application Field) The vinyl chloride-based tree plastisol of the present invention has good thermal stability during the production of transparent products made of vinyl chloride-based resin, especially transparent products, and has good water absorption and whitening properties. It is advantageously used to produce significantly improved transparent products.

(Prior Art) The vinyl chloride resin for paste used for preparing the vinyl chloride resin plastisol composition is: - First, vinyl chloride or a mixture of vinyl chloride and another monomer copolymerizable with the vinyl chloride, Emulsion polymerization is carried out using an emulsifier and a water-soluble polymerization initiator in an aqueous medium, or
For polymerization that is soluble in the 4r isomer: Using a J initiator, the monot and n isomers are dispersed into uniform oil droplets by mechanical shearing force and polymerized - by the so-called micro suspension polymerization method. It is produced by polymerizing to produce a homogeneous aqueous dispersion of vinyl chloride resin and then spray drying the dispersion.

A vinyl chloride resin plastisol composition produced using a paste resin produced in this manner contains the emulsifier and all other additives used during polymerization as they are. For this reason, transparent vinyl chloride resin products manufactured using vinyl chloride resin plastisol manufactured by this method, for example, when immersed in water, are free of additives such as emulsifiers used in the manufacture of paste resins. As a result, it easily absorbs water, turns white, and loses transparency. For example, the transparent skin layer of vinyl chloride foam flooring material called ri-shiso flooring absorbs water and becomes white and devitrified, causing printed patterns to become unclear and discoloration in the form of stains. Conventionally, there has been a demand for a vinyl chloride resin plastisol composition that can yield resin products that do not whiten upon water absorption.

In general, conflicting conditions are required to prevent water absorption and whitening of transparent products and to improve thermal stability during manufacturing. On the other hand, there was a contradiction in that if an attempt was made to reduce water absorption and whitening of the product, the thermal stability during product processing would deteriorate.

In JP-A-58-76441, a proposal was made to use a vinyl chloride resin for paste containing a phosphate emulsifier in order to prevent water absorption and whitening of resin products using a vinyl chloride resin plastisol. However, there were disadvantages in that the water absorption whitening property was not sufficiently improved and the thermal stability during molding was poor.

Also, JP-A-55-80445 and JP-A-59-
Publication No. 152941 discloses that in order to improve the thermal stability of halodane-containing resins such as vinyl chloride resins during molding, hydrotalcites, especially those with a BET specific surface area of 3.
It has been proposed to contain hydrotalcites having a surface area of 0 m2/11 or less and treated with membrane crystallization water together with a tin-based stabilizer and stearyl alcohol. However, such proposals only provide the effect of improving thermal stability, and do not mention at all how to simultaneously improve thermal stability and water absorption whitening properties, including the resin used. do not have.

(Problems to be Solved by the Invention) The present invention provides a vinyl chloride resin product that can be used in the production of vinyl chloride resin products, particularly transparent products, to obtain products that have excellent thermal stability during manufacturing processing and do not whiten upon water absorption. It is an object of the present invention to provide a resin plastisol composition.

(b) +1# improvement of the invention (means for solving the problem) As a result of repeated research on seeds in order to solve the above problem, the present inventors used a fatty acid emulsifier as the vinyl chloride resin. Hydrotalcites that have been previously coupled with acetalkoxyaluminum diisopropylates and a liquid composite stabilizer or an organotin stabilizer are added to the vinyl chloride resin for paste, which is manufactured by the same manufacturer and has a low total alkali metal content. This purpose could only be achieved by incorporating it.

That is, the vinyl chloride resin plastisol composition of the present invention contains acetic acid based on 100 M ft parts of a vinyl chloride resin for paste containing a fatty acid emulsifier as the main emulsifier and having a total alkali metal content of 500 ppm or less. 0.1 hydrotalnites which have been previously coupled with alkoxyaluminum diisopropylates.
~5. The ONN pubic area is characterized by containing a liquid composite stabilizer or an organic tin stabilizer in a proportion of 0.1 to 5.0 parts by weight.

The vinyl chloride resin to be coated used for producing the vinyl chloride resin plastisol composition of the present invention can be produced by a known method such as the method (1) or the method (2) above. However, as the emulsifier used in that case, a fatty acid emulsifier is used as the main emulsifier, and the total alkali metal content in the produced paste resin is 500%.
It is necessary to keep it below ppm.

The vinyl chloride resin for pear-stack used in the present invention is
It may be made of a homopolymer resin of vinyl chloride, or it may be made of vinyl chloride and, for example, vinyl acetate, vinyl propionate, methyl acrylate, methyl methacrylate, dibutyl maleate, diethyl fumarate, vinyl methyl ether, acrylonitrile, methacrylate. lonitrile, ethylene, propylene, styrene, vinylidene chloride,
There is no problem even if it is made of a copolymer resin with other monomers such as vinyl bromide.

The term "fatty acid emulsifier" used herein is a general term for fatty acid emulsifiers and fatty acid salt emulsifiers.

The reason why a fatty acid emulsifier is used as the main emulsifier is that vinyl chloride plastisol prepared using a paste resin made using other emulsifiers, such as lauryl sulfate or dodecylbenzene sulfonate, does not whiten due to water absorption. This is because it gives a remarkable resin product. Furthermore, the reason why the total alkali metal content in the paste resin is set to 500 ppm or less is that as the total alkali metal content in the paste resin increases, thermal stability improves, but water absorption whitening becomes significant. .

The fatty acid emulsifier as the main emulsifier is usually a fatty acid salt (
(in the case of method
In the case of the method described in ■), the force used is as follows.

Ru. The fatty acid of this fatty acid emulsifier has 8 to 20 carbon atoms,
The number of fatty acids is preferably 8 to 18, and one type of fatty acid may be used alone or a mixed fatty acid may be used. Examples of fatty acid salts include alkali metal salts, ammonium salts, and amine salts. However, alkali metal salts are undesirable because they increase the total alkali metal content in the resulting paste resin, and ammonium salts are undesirable. and amine salts, especially ammonium salts are preferred.

If an alkali metal salt is used, it should be used within a range in which the total alkali metal content in the resin to be coated does not exceed 500 ppm.

In some cases, other emulsifiers can be used in combination with the fatty acid emulsifier, which is the main emulsifier, as long as the amount is relatively small.

The amount of the fatty acid emulsifier to be used is 3 N weight % or less, preferably 0.3 to 1.0 weight percent, based on the amount of fatty acid based on the paste resin to be produced. If the amount of the emulsifier is too large, the quality of the vinyl chloride resin product may deteriorate due to bleeding or plateout of fatty acids or fatty acid salts.

In addition, in the production reaction of the vinyl chloride resin for paste used in the preparation of the vinyl chloride resin plastisol composition of the present invention, for example, persulfates (sodium salts, potassium salts, ammonium salts, etc.) are used as polymerization initiators. ), water-soluble peroxides such as hydrogen peroxide, or water-soluble redoxes consisting of these and reducing agents such as sodium sulfite, ammonium sulfite, sodium bisulfite, ascorbic acid, formterdehyde, sodium sulfoxylate, etc. A known initiator consisting of a catalyst, or an oil-soluble catalyst such as azobisisobutyronitrile, lauroyl, nitoxide, L-butylperoxypivalate, etc., or a combination thereof with the above-mentioned reducing agent for redox catalysts. etc. are used. However, sodium persulfate,
Initiators containing alkali metal salts such as potassium persulfate are undesirable because they increase the total alkali metal content in the resulting paste resin, and even if used, the total alkali metal content in the R-st resin may be 500 It should be used within a range of ppm or less.

The vinyl chloride resin for paste used in the present invention can contain various modifiers that are generally used as modifiers for resins for paste.

However, many of these modifiers have a negative effect on water absorption whitening properties and thermal stability, so the amount of modifiers added is
It is desirable to keep the amount to a small amount of 2 parts by weight to 1 part by weight of the paste resin. Examples of modifiers that can be added include higher alcohols, higher fatty acids, and nonionic surfactants.

In order to produce the composition of the present invention using the vinyl chloride resin for paste produced as described above, it is necessary to pre-mechanically bond the vinyl chloride resin for paste and acetalkoxyaluminum diinzolobyrates. This is carried out by using talcites and a liquid composite stabilizer or an organotin stabilizer in the above-mentioned proportions and dispersing them in a suitable plasticizer. The method of dispersion is as follows:
A method is used in which each of the above-mentioned components is mixed uniformly using a mixing agitator such as a high-speed mixer or a kneader after adjusting the ingredients in a predetermined manner.

Various methods can be used to couple hydrotalcites with acetalkoxyaluminum diimpropylates in advance, but usually hydrotalcites are coupled with acetalkoxyaluminum diimpropylates. Both are mixed at room temperature or under heating, preferably at room temperature, in a liquid medium such as a plasticizer (such as dioctyl phthalate) used in a ratio of 0.001 to 0.05 parts by weight and preferably blended into plastisol. A contact method is used.

The hydrotalcites to be subjected to the coupling treatment are preferably those having a BET specific surface area of 30 m''/i or less and subjected to membrane crystallization water treatment.The acetalkoxyaluminum diimpropylates include:
For example, acetomethoxyaluminum diisopropylate, acetoethoxyaluminum noisopropylate,
Examples include acetobutoxyaluminum rhamnoisopropylate-a.

If hydrotalcites are previously coupled with such acetalkoxyaluminum diimpropylates, they become fine particles and are easily dispersed in plastisol compositions, which in turn leads to the dispersion of organic compounds such as resin components in plastisols. It is thought that as a result of the increased affinity with the components, the heat resistance and water absorption whitening properties of the resulting molded resin are significantly improved compared to untreated hydrotalcites. In addition, instead of coupling hydrotalcites with acetalkoxyaluminum diimpropylates in advance, it is possible to combine hydrotalcites with acetalkoxyaluminum diimpropylates when preparing plastisol. Although a certain degree of improvement effect on heat resistance and water absorption whitening property can be obtained with this method, the improvement effect is significantly inferior to the case where a force or pulling treatment is applied in advance.

A "composite stabilizer" as described herein is a salt of at least two metal organic acids, such as ricinoleic acid, 2-ethylhexoic acid, naphthenic acid, benzoic acid, salicylic acid; The agent is usually commercially available as a liquid composite stabilizer.

Examples of the liquid composite stabilizer used in the present invention include barium-zinc-based stabilizers, magnesium-zinc-based stabilizers,
There are calcium-zinc type, calcium-barium type, cadmium-barium type, barium-zinc-tin type, cadmium-barium-zinc type, sodium-zinc type, etc. Examples of organotin stabilizers include dibutyltin nolaurate, dioctyltin dilaurate, dibutyltin malate, butyltin mercaptide, and these organotin stabilizers are also usually commercially available in liquid form. Of these stabilizers,
Although the cause is unknown, substances containing alkali metals such as sodium-zinc stabilizers have a negative effect on the water absorption and whitening properties of resin products, so it is not preferable to use them unnecessarily. Particularly preferred liquid composite stabilizers are zinc-based composite stabilizers or liquid organotin-based stabilizers that do not contain alkali metals.

The content ratio of the alkali metal-free liquid composite stabilizer or the soot-heating organotin stabilizer in the composition of the present invention is 0.01 to 0.01 to 100 parts by weight of the vinyl chloride paste resin.
The amount is 5.0 parts by weight, preferably 0.15 to 3.0 parts by weight. If the content is too small, thermal stability will be poor, and if it is too large, water resistance cannot be achieved.

The content ratio of the hydrotalcites subjected to the coupling treatment in the composition of the present invention is from 0.1 to 100 parts by weight based on 100 parts by weight of the vinyl chloride paste resin.
5.0 parts by weight, preferably 5.0 parts by weight, is not preferable because the effect of improving thermal stability cannot be expected, and if it is too much, the transparency of the resulting product will decrease.

Hydrotalcites may be added to the composition of the present invention at any stage during the manufacturing process of the vinyl chloride resin for paste, or during the trial manufacturing process of plastisol.

The vinyl chloride resin glastisol composition of the present invention contains, in addition to the above-mentioned components, a suitable plasticizer as described above, and the composition itself is in the form of a sol. Examples of the plasticizer include phthalate ester plasticizers such as dibutyl phthalate, zohedecyl phthalate, dioctyl phthalate, diisodecyl phthalate, butyl lauryl phthalate, ditridecyl phthalate, butyl benzyl phthalate, and butyl phthalyl butyl glycolate. + trimellitic acid plasticizers such as J mellitate, trihebutyl trimellitate, and trioctyl trimellitate; noriester plasticizers obtained by condensation of polybasic acids and glycols ~ tricresyl phosphate, trioctyl phosphate, etc. Phosphate ester plasticizers such as tri-n-butyl citrate, dioctyl adipate, dioctyl azelate, dioctyl sepacate, fatty acid ester plasticizers such as methyl acetyl ricinoleate, alkyl epoxy stearates, epoxies such as epoxidized soybean oil Examples include plasticizers.

These plasticizers may be used alone or in combination of two or more.

The amount of plasticizer used in the composition of the present invention is usually 30 to 30 parts by weight per 100 parts by weight of the vinyl chloride paste resin.
The amount is 120 parts by weight, preferably 40 to 80 parts by weight.

The vinyl chloride resin plastisol composition of the present invention further includes pigments, fillers, antistatic agents, antifogging agents, surface treatment agents,
Various other additives may be contained. (Examples, etc.) The following is a detailed description of K-st resin production examples, examples, and comparative examples. “Part” and “H” in these examples are
Not specified - Based on limited standards.

Example A of producing fat for paste In a polymerization tank with a capacity of 2 oz equipped with a stirrer, 90 yen of ion-exchanged water at a temperature of 54° C. was added, 12. Add ammonium persulfate of F and ammonium sulfite of 751, and make about 20
Stir for a minute to dissolve. Next, the inside of the polymerization tank was heated to 1610
It was degassed to a certain Hg level and kept at 54°C for 50 minutes.

Next, put it in the polymerization tank to 60! ? of vinyl chloride monomer was charged, and the temperature inside the polymerization plant was raised to 50°C. After 15 minutes have elapsed after the addition of monomer II, a pre-dissolved aqueous solution of 0 or 2 diammonium persulfate was gradually added at a rate of about 10 cc per minute, and then the polymerization was continued to maintain a predetermined polymerization rate. React while controlling the addition rate of ammonium sulfate solution,
When the polymerization rate reached 15%, the addition of a 10% aqueous solution of ammonium myristate that had been dissolved in advance was started, and the total addition rate of the aqueous solution was 300% per hour. When it reached 9, it was added.

The reaction was stopped when the pressure inside the tank at 50° C. dropped by 2.0 kg from the saturation pressure of the vinyl chloride monomer, and the unreacted single stitch was collected to obtain a polymer latex.

The total amount of the ammonium persulfate aqueous solution added was 4.2b.
Met.

The obtained latex particles have an average particle diameter of 0.40±0
．． The latex was a highly stable latex. This latex was spray-dried in a conventional manner and then pulverized to obtain about 54 kg of vinyl chloride resin for yeast. The polymerization rate was 90%. This paste vinyl chloride resin will be referred to as "resin A" below. Resin A had an alkali metal content of 10 ppm (calculated value O) as measured by atomic absorption spectrometry, and a fatty acid emulsifier content of about 0.5s6z in terms of fatty acids.

Paste Resin Creation Example B In Production Example A, ammonium persulfate was replaced with potassium persulfate, ammonium sulfite was replaced with sodium sulfite, ammonium myristate was replaced with lauryl sulfate), and ammonium myristate was replaced with lauryl sulfate. A vinyl chloride resin for paste was manufactured. The particles of the obtained latex were monodisperse particles with an average particle diameter of 0650±0.01μ.

This latex was spray dried and ground to obtain about 54 hours of one-stroke vinyl chloride resin. The polymerization rate was 90%. This vinyl chloride resin for paste is called "resin B". Resin B has an alkali metal content of 570 Ppm (calculated value s 53 ppm) measured by atomic absorption spectrometry, and a fatty acid emulsifier content of 0 (lauryl sulfate).
The IJium content was 0.45%.

Paste resin production example C: Capacity 200 with a stirrer! In a polymerization tank, 80 kg of ion-exchange treated water and the latex containing vinyl chloride polymer (seed) having an average particle diameter of about 0.5 μ obtained in Production Example B above were added as a polymer. oky, and metasulfite)
After charging 100 g of IJum, it was degassed, and vinyl chloride monomer 75 was charged with 9, and the temperature was raised to 50°C.

Thereafter, a total of 1 og of ammonium persulfate solution 107 was gradually added at a rate of 13 cc per minute, and thereafter, while controlling the addition rate of the ammonium persulfate solution to maintain a predetermined polymerization rate. From the time when the polymerization rate reached 10% until the end of polymerization, a 10% aqueous solution of ammonium myristate was added continuously to the total amount of vinyl chloride monolithic and Miko polymer at about 0.7 kg per hour. Ammonium myristate 0.8 k
y was added continuously. Polymerization was stopped when the pressure inside the tank at 50°C dropped by 2.0 ky/cIn'' from the saturation pressure of vinyl chloride, and unreacted monomers were collected.The total polymerization rate including the seed polymer was 90=1. The average particle diameter of the obtained latex was 0.8μ, and the stability of the latex was good.

This latex was sprayed and pulverized according to a conventional method to obtain a vinyl chloride resin for R-st. This paste resin is called "resin C." Resin C had an alkali gold content of 350 ppm (calculated value 357) as measured by atomic absorption spectrometry, and a fatty acid emulsifier content of about 1.11 M% as fat.

Example of manufacturing paste resin: In the above Production Example C, ammonium persulfate was changed to potassium persulfate, ammonium myristate was changed to lauryl sulfate), and hydrogen carbonate was added when adding the seed polymer latex) +7 um to 30 um. ．． Polymerization was carried out in the same manner as in Production Example C except that F was added. The polymerization rate including the seed polymer was 90%, and the average particle size of the obtained latex was 0.8μ.

This latex was spray-dried and ground in a conventional manner to obtain a vinyl chloride resin for paste. This paste resin is called "Resin DJ.The resin has an alkali metal content of 1200 ppm (calculated value 11
55 ppm), and the content of fatty acid emulsifier is O (lauryl sulfate).
Met.

Paste resin production example E: 100 kg of ion-exchange treated water and 600 lauroyl gloss oxide were placed in a prepolymerization tank with a capacity of 12007 equipped with a stirrer.
．． F. Add 400 g of sodium lauryl sulfate and 200 g of lauryl alcohol, degas the inside of the prepolymerization tank, then add 60 klJ of vinyl chloride monomer, and add 35 g of sodium lauryl sulfate and 200 g of lauryl alcohol while stirring.
It was held at ℃ for 10 minutes. Next, the contents in the prepolymerization tank were heated to 250 kfi/an'' using an emulsifying machine so that the contents became the desired droplet size (about 0.4μ on average).
While carrying out emulsification treatment, the mixture was transferred to a 200-capacity polymerization tank equipped with a stirrer and previously degassed. After the transfer was completed, the temperature inside the polymerization tank was raised to 47° C., and the polymerization was completed by a known method. A latex with a polymerization rate of 904 and good stability was obtained. Polymer particles in this latex (
The average particle diameter of S planned coalescence was 0.4 μm and 0.01 μm.

Next, 80 kg of ion-exchange treated water was placed in a 1200 A polymerization tank equipped with a stirrer, and the seed latex with an average particle diameter of about 0.4 μ obtained as described above was added as a polymer. 4.
6 kl? The amount of lauroyl peroxide in the seed latex was adjusted by charging and holding at 60° C. for 2 hours. Next, the inside of the polymerization tank was degassed, and vinyl chloride monomer 75.4
kg, and after raising the temperature inside the polymerization tank to 50℃,
Polymerization was started by gradually adding a 0.3% aqueous solution of ammonium sulfite that had been dissolved in advance. The ammonium sulfite aqueous solution was added continuously while being controlled to maintain a constant polymerization rate. From the time when the polymerization rate reaches 10 to the end of polymerization, a 10% water bath solution of 6 +) ammonium stenate, which has been dissolved in advance as an emulsifier, is added to the charged vinyl chloride monomer and seed polymer. Continuously charged at a rate of about 0.71 kg per hour to the total amount of ammonium myristate, the 1M combined tank internal pressure was The polymerization reaction was stopped when the pressure dropped from the saturation pressure to 2.0 kg/F2, and unreacted monomers were collected to obtain a polymer latex.

The polymerization rate was 90% including the seed polymer, and the average particle size of the latex was 1.0μ. The obtained latex was spray-dried and pulverized to give a paste-grade vinyl chloride resin of about 72 to 9. This resin for (-st) is called "Resin E".
6 Resin E has an alkali metal content of 40 ppm (calculated value 38 ppm) measured by atomic absorption spectrometry, and a fatty acid emulsifier content of about 1.1 as fatty acid.
It was 1ifi.

Paste Resin Production Example F A polymer latex was produced in the same manner as Production Example E except that the ammonium myristate used in the main polymerization after addition of seed latex in Production Example E was changed to sodium dodecylbenzenesulfonate. . Polymerization rate is 90
The average particle diameter of the obtained latex is approximately 1.0
It was μ.

This latex was spray dried and ground to obtain about 72 kg of vinyl chloride resin for paste. This paste resin is called "Resin F".6 Resin F has an alkali metal content of 790 ppm (total X value of 772 ppm) as measured by atomic absorption spectrometry.
m) The content of the fatty acid emulsifier was 0 (the content of sodium dodecylbenzenesulfonate was 0.90% by weight).

Examples 1 to 12 Comparative Examples Each resin A obtained in the above paste resin production examples A to F
-F respectively, and dioctyl phthalate)
(DOP), the following various stabilizers, and the following coupling agent-treated hydrotalcite or coupling agent-untreated hydrotalcite, etc., are blended according to the following formulation examples Plastisols were prepared, and each plastisol obtained was subjected to the following initial two color, thermal stability, and water absorption whitening tests. The results were as shown in Table 1.

(1) Stabilizer used: Ha-Zn type: Nissan Ferro Organic Chemical Co., Ltd., trade name LTL-66E, Ba-Zn type liquid composite stabilizer.

M machine Sn series...Katsuta Kako Co., Ltd. product name T-17MJ
.

4-form organotin stabilizer.

Zn-Na type...ADEKA ARGUS Co., Ltd. Product name F
L-21, Zn-Na-based liquid composite stabilizer.

(11) Hydrotalcite used and its mode of use: a) Untreated product: Kyowa Chemical Industry Co., Ltd. (trade name) Alkamayde ■, BET specific surface area 20 m2/y, de-18 crystalline water treated N product.

b) 27 7' IJ agent-treated product: Add 1 kg of the above Alkamayde ① to DOP] kg, add 0.02 kg of acetomethoxyaluminum noisoderovir, and stir at room temperature for 15 minutes. Processed.

C) Combined use of a coupling agent: At the time of sol preparation, acetomethoxyaluminum diimpropylate is added at the same time in a ratio of 0.02 part to 1 part of untreated Alcamide H.

(iii) Examples of formulations are shown in the table below.

*In the case of b) and e), the actual addition amount of hydrotalcite was adjusted as shown in the table. In case a),
The final blending amount of DOP was adjusted as shown in the table.

(iv) Test method Initial coloring test: Plastisol is coated on aluminum foil so that J"5 after heating is one square, and the coated film is heat-treated at 195°C for 5 minutes and then cut out. The sheet is then heated at a temperature of 195° C., taken out every 5 minutes, and the time taken until it becomes pale yellow colored is determined visually.

Thermal stability test: The above initial coloring test is continued, and the time required for coloring to red (black) brown is visually determined.

Water absorption whitening test: A coating film obtained by coating on a glass plate in the same manner as in the above initial coloring test was heated at 195°C for 1
A sheet with a thickness of 1 inch, cut out after being dulled and melted for 0 minutes, was immersed in hot water at 40°C for 60 minutes, then taken out, and a light beam with a wavelength of 550 mμ was transmitted using a spectrophotometer, and the amount of transmitted light was measured. It is expressed as light transmittance.

(c) Effects of the Invention The vinyl chloride resin plastisol composition of the present invention provides a vinyl chloride resin product with extremely excellent water absorption and whitening properties and thermal stability. In addition, treated hydrotalcites obtained by treating hydrotalcites added to plastisol with alkoxyaluminum diisopropionates in a plasticizer medium before addition to plastisol are added to the plastisol. Yes, you can get a significantly better effect. In addition, even if you add untreated hydrotalcites or a treatment agent and hydrotalcite to Chisol at the same time, the effect will be j', ij,
−,−,−”,'.

Claims (1)

[Scope of Claims] 1) 100 parts by weight of a vinyl chloride paste resin containing a fatty acid emulsifier as the main emulsifier and having a total alkali metal content of 500 ppm or less is preliminarily treated with acetalkoxyaluminum diisopropylates. Contains 0.1 to 5.0 parts by weight of coupled hydrotalcites and 0.1 to 5.0 parts by weight of a liquid composite stabilizer or organotin stabilizer that does not contain alkali metals. A vinyl chloride resin plastisol composition characterized by: 2) The fatty acid emulsifier as the main emulsifier is a fatty acid emulsifier having 8 to 18 carbon atoms, and contains 0.3 to 3 parts by weight of fatty acid based on the vinyl chloride resin for paste. Compositions as described in Section.