JPH0873688A - Production of polyvinyl chloride-based resin composition - Google Patents

Abstract

PURPOSE: To obtain a composition suppressing occurrence of fish eye and having excellent appearance, by adding a polymer polyol to a solution of a polyisocyanate compound, mixing the dispersion component with a PVC-based polymer and melting and blending under heating. CONSTITUTION: A compound containing three or more isocyanate groups (e.g. a trimer of 2,4-tolylene diisocyanate, 1,6,11-undecane triisocyanate or polyphenylmethane polyisocyanate) is previously diluted with a plasticizer such as di-n-butyl phthalate and mixed with a polymer polyol such as polyester polyol to prepare a uniformly dispersed liquid component. Then the component is mixed with a PVC-based polymer having 400-10,000 degree of polymerization and melted and kneaded under shear stress by heating at 100-200 deg.C to give the objective composition.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a polyvinyl chloride resin composition.

[0002]

As a method for producing a polyvinyl chloride resin composition having excellent compression set characteristics, JP-A-3-294 is known.
No. 326, a polyvinyl chloride polymer (hereinafter referred to as PV
C), a polymer polyol and an isocyanate compound, or those obtained by adding a plasticizer as necessary to these, and heating and melting and kneading them under shear stress have been proposed.

[0003]

However, when the polyvinyl chloride resin composition obtained under such conditions was molded, it was not always possible to obtain a processed product having a clean appearance. This is due to the presence of fish eyes (hereinafter referred to as FE) in the composition, and conventional soft PVC
It is also a problem. F. in the obtained molded product. E. There is a large one of several mm.

Generally, in the case of hard PVC, soft PVC, etc., the F.I. E. Is formed only from unmelted particles of PVC, but as described in the above publication,
In the case of blending PVC, polymer polyol and a compound having three or more isocyanate groups, F.I. E. Not only the unmelted particles of PVC but also the polyurethane gel component formed by the reaction during heat-melt kneading is one of the causes of the complex F.I. E. Is formed. Dispersion unevenness of each component forms a reaction active substance such as an isocyanate compound and unevenness of the concentration of the polymer polyol which is a reaction pair thereof, and further by these reaction,
This produces gel component regions with different concentration differences. That is, in a region where the concentration of the isocyanate component is high and the concentration of the polymer polyol component is low, a very large gel structure is formed. The largest size of this gel structure is about several hundreds of microns. In addition, the above-mentioned non-uniformity of the reaction-active substance is caused by wrapping the PVC particles by the urethane-forming reaction and not melting even when heated and kneaded under shear stress. E. To form.

Therefore, when used as an interior / exterior product for automobiles or household appliances, the appearance was not sufficient.

The object of the present invention is not only superior in compression set characteristics, but also in the method of less melt-kneading PVC, polymer polyol and isocyanate compound under shear stress as compared with this conventional method.
F. E. It is intended to provide a method for producing a polyvinyl chloride resin composition which is excellent in the appearance of a molded surface by reducing the amount of resin.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have made earnest studies in view of the above-mentioned situation, and as a result, by controlling the mixing order of liquid components in raw materials, the F. E. The present invention has completed the manufacturing method of the present invention, which suppresses the occurrence of the above phenomenon and exhibits an excellent appearance.

That is, according to the present invention, a polymer polyol is added to a product obtained by previously diluting a compound having 3 or more isocyanate groups with a plasticizer to prepare a uniformly dispersed liquid component, which is mixed with PVC and subjected to shear stress. A method for producing a polyvinyl chloride resin composition that is melted by heating and kneading, a method in which a PVC used is impregnated with a urethane reaction catalyst, and a PVC used is impregnated with a urethane reaction catalyst and a plasticizer The gist of the method is a method in which a PVC used is impregnated with a urethane reaction catalyst, a plasticizer and a polymer polyol.

The present invention will be described in detail below.

The compound having three or more isocyanate groups is diluted and mixed with an isocyanate group selected from the plasticizers and a substance having no reaction activity to prepare a solution having a low isocyanate functional group concentration. Uniform blending becomes possible by setting the blending order of mixing the polymer polyol with this. When the liquid component is blended in this way, the reaction active group concentration of the isocyanate compound can be suppressed to a low level in the entire mixed liquid diluted with the plasticizer, and the polymer polyol forming a reactive pair with the isocyanate compound before the reaction starts. It is possible to minimize the density unevenness of the components.

The homogeneous liquid and PVC are melted and kneaded under heating under shear stress to obtain F.I. E. It is possible to obtain a resin composition in which In particular, when a substance having a fast reaction rate is selected from compounds having three or more isocyanate groups, F.I. E. Shows the improvement effect of.

When a urethane-forming reaction catalyst is used,
In order to prevent the liquid component, in which the polymer polyol and the compound having three or more isocyanate groups are uniformly dispersed, from coming into contact with the urethane-forming reaction catalyst until all the components are mixed, the urethane-forming reaction catalyst is impregnated in PVC in advance. Used as a powder component. This makes it possible to prevent the liquid component alone from proceeding to the reaction before the PVC particles are melted. Further, by impregnating PVC with a plasticizer or a plasticizer and a polymer polyol in addition to the urethane-forming reaction catalyst, the F.V. E. The formation of particles can be suppressed, and the particle disintegration of PVC at the time of heating, melting and kneading under shear stress can be promoted.

It is also possible to use the urethane-forming reaction catalyst without impregnating PVC. In this case, in order to avoid the heterogeneity of the catalyst, in the preparation on the liquid component side, after the catalyst and the compound having three or more isocyanate groups are diluted and mixed with the plasticizer in advance, the polymer polyol is added and uniformly dispersed. Is desirable. However, in this method, it is desirable to lower the catalyst concentration so that the prepared liquid component does not proceed as much as possible before the reaction starts before kneading under shear stress.

The PVC used in the present invention is a vinyl chloride-containing polymer, which is one of vinyl chloride homopolymer, chlorinated vinyl chloride polymer, and all monomers copolymerizable with vinyl chloride monomer. Examples thereof include vinyl chloride copolymers obtained by random copolymerization, graft copolymerization or block copolymerization with two or more species, and one or two of the above polymers.
More than one seed is used.

Examples of the monomer copolymerizable with the vinyl chloride monomer include ethylene, propylene, butene, pentene-1, butadiene, styrene, α-methylstyrene,
Acrylonitrile, vinylidene chloride, vinylidene cyanide, alkyl vinyl ethers, carboxylic acid vinyl esters, aryl ethers, dialkyl maleic acids, fumaric acid esters, N-vinyl pyrrolidone, vinyl pyridine, vinyl silanes, acrylic acid alkyl esters, methacryl Examples thereof include acid alkyl esters.

The PVC having a polymerization degree of 400 to 10,000, preferably 500 to 5,000, is used.

As for the particle characteristics of PVC, particles of 350 μm or more are 0.1 wt% or less, preferably 0.05 w.
t% or less, and particles of 250 to 350 microns are 0.5
The one whose particle size distribution is adjusted to be not more than wt%, preferably not more than 0.3 wt% is used. As a result,
F. It is possible to obtain a resin composition having a relatively smooth processed surface appearance with less E.

Examples of the compound having three or more isocyanate groups used in the present invention include 2,4- and 2,6-
-Tolylene diisocyanate, m- and p-phenylene diisocyanate, 1-chlorophenylene-2,4-diisocyanate, 1,5-naphthalene diisocyanate, methylenebisphenylene-4,4'-diisocyanate, m- and p-xylene diisocyanate Nate, hexamethylene diisocyanate, lysine diisocyanate, 4,
4'-methylenebiscyclohexyl diisocyanate,
Trimer of diisocyanate such as isophorone diisocyanate and trimethylhexamethylene diisocyanate,
Triisocyanates such as 1,6,11-undecane triisocyanate, lysine ester triisocyanate, 4-isocyanate methyl-1,8-octamethyldiisocyanate, and polyfunctional isocyanates such as polyphenylmethane polyisocyanate are mentioned. 1 type (s) or 2 or more types are used. It is also possible to use the above diisocyanates together.

The plasticizer used in the present invention is, for example, di-n-butyl phthalate, di-2-ethylhexyl phthalate (hereinafter referred to as DOP), di-n-octyl phthalate,
Phthalic acid plasticizers such as diisodecyl phthalate, diisooctyl phthalate, octyldecyl phthalate, butylbenzyl phthalate, and di-2-ethylhexyl isophthalate,
Di-2-ethylhexyl adipate, di-n adipate
-Decyl, diisodecyl adipate, dibutyl sebacate, aliphatic ester plasticizers such as di-2-ethylhexyl sebacate, trioctyl trimellitate, tridecyl trimellitate, pyromellitic acid plasticizers such as tributyl phosphate, Tri-2-ethylhexyl phosphate, 2-ethylhexyl diphenyl phosphate, phosphate ester-based plasticizers such as tricresyl phosphate, epoxy-based plasticizers such as epoxy-based soybean oil, polyester-based polymer plasticizers, and the like. 1 type or 2 types or more of these can be used.

However, as the plasticizer used for diluting the compound having 3 or more isocyanate groups, a substance having no functional group such as amine or hydroxyl group, which is reactive with the isocyanate functional group, is used.

The polymer polyol used in the present invention is not particularly limited. As the polymer polyol, for example, one kind or two or more kinds of polyester polyol, polyether polyol, polycaprolactone polyol, polycarbonate polyol, castor oil-based polyol, saponified EVA (ethylene-vinyl acetate copolymer) and the like are used. . The polyester polyols listed here include, for example, ether ester type polyester polyols obtained by polycondensation of diethylene glycol and adipic acid, and also include those polyfunctionalized by modification with other functional groups. Be done. Polyester polyols, polycarbonate polyols, and polycaprolactone polyols also include polyfunctional polyols having 3 or more hydroxyl groups.

As the urethanization reaction catalyst used in the present invention, a general urethanization reaction catalyst can be used.
For example, triethylamine, triethylenediamine, N
Examples thereof include amine-based catalysts such as methylmorpholine and tin-based catalysts such as tetramethyltin, tetraoctyltin, dimethyldioctyltin, triethyltin chloride, dibutyltin diacetate and dibutyltin dilaurate.

However, from the viewpoint of compression set characteristics, it is desirable that the number of moles of NCO groups of triisocyanate is 0.25 or more relative to the number of moles of NCO groups of all isocyanates. The molar ratio of isocyanate group / hydroxyl group in the above-mentioned polymer polyol and the compound having three or more isocyanate groups is preferably in the range of 0.3 to 1.3 when diol is used as the polymer polyol. If the isocyanate group / hydroxyl group molar ratio is less than 0.3, even if only triisocyanate is used as the isocyanate, sufficient compression set performance may not be exhibited due to insufficient crosslinking density, and the isocyanate group / hydroxyl group molar ratio may be 1 or less. If it exceeds 0.3, the resin may not be processed.

The total blending amount of the polymer polyol used in the present invention and the compound having 3 or more isocyanate groups is 30 parts by weight or more and 900 parts by weight with respect to 100 parts by weight of PVC.
It is not more than 30 parts by weight, preferably not less than 30 parts by weight and not more than 500 parts by weight, more preferably not less than 30 parts by weight and not more than 300 parts by weight, and the composition obtained in this range has good compression set and processability. .

The method of impregnating various components into PVC can be carried out by the same method as the raw material mixing which is usually carried out before the kneading operation of PVC. Examples of the method include a Henschel mixer (manufactured by Mitsui Miike) when a porous and particulate PVC produced by a suspension polymerization method or the like used in ordinary calender molding, extrusion molding, injection molding, or the like is used. Super mixer (manufactured by Kawata Manufacturing)
Various raw material components are added to PVC using a powder mixing apparatus such as the above, and the stirring blades are rotated to disperse and mix them. Due to the shear stress due to this stirring, the temperature of the raw material components gradually rises, and the added liquid component is PV
It is possible to impregnate C.

To the polyvinyl chloride resin composition according to the present invention, stabilizers usually added to PVC can be added to such an extent that the performance thereof is not extremely deteriorated. Examples of the stabilizer include metal soap stabilizers such as lead stearate, calcium stearate, barium stearate, zinc stearate, and cadmium stearate; epoxy stabilizers such as epoxidized soybean oil and epoxidized linseed oil; phosphites. Examples include system stabilizers and the like. Further, if necessary, a lubricant, a colorant, an inorganic filler represented by calcium carbonate, talc, etc., a flame retardant represented by antimony trioxide or zinc borate, and a light resistance stabilizer such as an ultraviolet absorber are appropriately added. can do.

The method for producing the polyvinyl chloride resin composition of the present invention can be obtained by heating and melting and kneading the above-mentioned components under shear stress. At this time, tetrahydrofuran (hereinafter referred to as THF) in the composition is insoluble. 5 to 55% by weight
It is preferable that The polyvinyl chloride resin composition thus obtained is more excellent in compression set and moldability.

In the method for producing a polyvinyl chloride resin composition of the present invention, as an apparatus that can be used for heating and melting and kneading the above raw materials under shear stress, for example, an interface such as a Banbury mixer or a pressure kneader can be used. A kneader capable of heat-shear melting the resin, such as a null-type mixer and an extruder, can be used. For example, taking a Banbury mixer as an example, the above raw materials are charged into an apparatus in which the casing temperature is set to 100 to 200 ° C., and if necessary, other stabilizers are added, and the mixture is melted by heating and kneading.
A polyvinyl chloride resin composition can be obtained.

[0029]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited to these examples.

The method for measuring the THF insoluble content in the examples was carried out by the following method.

(Method for measuring THF insoluble content) The obtained resin composition is pulverized by freezing and accurately weighed (Xg). This 8
Soxhlet extraction with THF solvent for hours. The obtained extract was dried, the THF-soluble component in the extract was accurately weighed (Yg), and calculated from the following formula.

THF insoluble matter (wt%) = 100 (X−Y) / X The compression set was measured by the following method.

(Method for measuring compression set) A cylindrical test piece of 12.7 ± 0.1 mm was prepared by hot pressing the obtained resin composition at 175 ° C., and the compression set was measured according to JISK63.
According to No. 01, the measurement was performed at 70 ° C. and after 22 hours. First, the thickness of the obtained composition press-molded product was accurately measured (X mm), and it was placed in a compression set measuring device of JIS K6301 and taken out after 70 hours at 22 ° C., and the thickness was measured again (Y mm). It was calculated from the following formula.

Compression set (%) = (X−Y) × 100 / (X−9.52) However, the spacer thickness used in the apparatus here is 9.52.
mm.

F. in resin E. The degree of the generated amount has a great influence on its moldability and appearance, and it is desirable that the amount is small. The F. E. Clearly shows the appearance of extrusion. E. According to the above criteria, a judgment criterion is set to evaluate the roughness of about 200 μm or more, which has a noticeable effect on the appearance and touch. In particular, the appearance evaluation of extrusion is rough and the F.I. E. The criteria match very well.
F. E. The determination is made by the following method.

(FE measurement method) On a smooth device having a milky white acrylic plate on a fluorescent lamp, the F.E.
E. Read. At this time, the resin composition was colored ultramarine on the heating roll to make it easy to read,
Process into a sheet with a front and back thickness.

Measurement conditions: 500 g of the obtained resin composition is melted by an 8-inch roll mill heated to 150 ° C. with a roll gap of 1 mm. Immediately after melting, 2.5 g of ultramarine blue for coloring is added and kneaded for 5 minutes to uniformly disperse. After kneading for 5 minutes, the thickness is adjusted to 0.35 mm and the sheet is taken out. This sheet is placed on a 25 cm × 30 cm milky white acrylic plate on which 16 circles with a diameter of 1.99 cm are randomly marked, and F.S. E. Is counted. However, F.I. E. This method is modified and used depending on the degree of. That is, very F.I. E. When the F. is small, all F.S. E. In the case of a very large number, the F.S. E. Is counted, converted into 50 cm ² as a predetermined area, and provided for comparison.

In a molded product such as extrusion molding, the appearance of the molded product is F.I. E. Be affected by. That is, F. E. When the number of the particles increases, minute irregularities are formed on the surface of the molded product, so that the surface becomes rough. Therefore, the appearance was judged by extrusion molding, and the molded product was used as follows.

(Evaluation of Extrusion Molding) A roll kneading sheet of the obtained resin composition was used for 3 mm by using a sheet pelletizer.
A pellet of about 3 mm x 2 mm is used for extrusion molding.

Extrusion molding conditions: A Labo Plastomill φ20 mm single-screw extruder manufactured by Toyo Seiki as a device, a ribbon compression sheet having a screw compression ratio of 3, a die shape having a width of 20 mm and a thickness of 2 mm is extruded, and its surface condition is evaluated and observed.
Extrusion temperature is 16 for cylinder # 1 from the raw material supply side.
Set 0 ° C, 160 ° C for the cylinder # 2 and 170 ° C for the die.

Judgment: ◯: Smooth appearance ………… Good ×: Remarkable graininess …… Poor Example 1 Ethylene-vinyl chloride copolymer obtained by suspension polymerization method (Leuron E-2800, lot) 355EH04,
Particle size 350 micron or more 0 wt%, 250 ~
350 micron 0.3 wt%, Tosoh Co., Ltd.) 529
To g, 1 g of barium stearate and 2.65 g of zinc stearate were added as stabilizers to prepare a uniformly dispersed powder raw material component. On the other hand, as a liquid raw material component, 80 ° C in advance
Heated DOP (di-2-ethylhexyl phthalate)
529 g of tetraphenyl polypropylene glycol diphosphite as a stabilizer (manufactured by Akishima Chemical Co., Ltd.,
3.17 g of trade name LT-1000H) and 0.04 g of dibutyltin dilaurate as a catalyst are added to and mixed with a liquid.
Hexamethylene diisocyanate trimer (Nippon Polyurethane Co., Ltd., trade name Coronate HX) 70.9 g
(NCO / OH ratio = 0.85) was added, and the mixture was stirred and mixed again to obtain a uniform liquid mixture. Polymer polyol manufactured by Nippon Polyurethane (trade name: Nipolan, grade 4067, number average molecular weight 2000) 4 heated to 80 ° C. 4
23 g was added and mixed with stirring. Immediately add the powder raw material component and the liquid raw material component to a Banbury mixer having an internal volume of 1700 cc and a casing temperature of 150 ° C., and rotate 40 revolutions /
The mixture was melted and kneaded by heating for 25 minutes. After completion of the kneading, the obtained resin composition was put into a roll kneader at 170 ° C. to form a sheet, and then F.I. E. Measurement, extrusion evaluation, THF insoluble content measurement and compression set measurement were performed. The results are shown in Table 1.

Example 2 When an ethylene-vinyl chloride copolymer was produced by the suspension polymerization method, dibutyltin dilaurate was charged as a catalyst in advance and uniformly dispersed in an amount of 0.0076 g per 100 g of the ethylene-vinyl chloride copolymer particles. Tata (average degree of polymerization 2
800, particle size 350 micron or more 0 wt%, and 250-350 micron 0.3 wt%) 529 g were added with barium stearate 1 g and zinc stearate 2.65 g as stabilizers to prepare a uniformly dispersed powder raw material component. . On the other hand, 529 g of DOP (di-2-ethylhexyl phthalate) preheated to 80 ° C. as a liquid raw material component
In addition, as a stabilizer, tetraphenyl polypropylene glycol diphosphite (Akishima Chemical Co., Ltd., trade name L
T-1000H) 3.17 g was added to the mixed liquid,
Hexamethylene diisocyanate trimer (Nippon Polyurethane Co., Ltd., trade name Coronate HX) 70.9 g
(NCO / OH ratio = 0.85) was added, and the mixture was stirred and mixed again to obtain a uniform liquid mixture. Polymer polyol manufactured by Nippon Polyurethane (trade name: Nipolan, grade 4067, number average molecular weight 2000) 4 heated to 80 ° C. 4
23 g was added and mixed with stirring. Immediately add the powder raw material component and the liquid raw material component to a Banbury mixer having an internal volume of 1700 cc and a casing temperature of 150 ° C., and rotate 40 revolutions /
The mixture was melted and kneaded by heating for 25 minutes. After completion of the kneading, the obtained resin composition was put into a roll kneader at 170 ° C. to form a sheet, and then F.I. E. Measurement, extrusion evaluation, THF insoluble content measurement and compression set measurement were performed. The results are shown in Table 1.

Example 3 In a 10 L Henschel mixer (manufactured by Mitsui Miike), an ethylene-vinyl chloride copolymer (Leuron E-2800, Lot 355EH04, particle size of 350 μm or more, 0 wt%, obtained by the suspension polymerization method, 250-350 micron 0.3 wt%, manufactured by Tosoh Corp., 1983.8 g
Then, 3.75 g of barium stearate and 9.94 g of zinc stearate as powder stabilizers were added and uniformly dispersed.
To this, 991.9 g of DOP (di-2-ethylhexyl phthalate) as a liquid component, and 11.9 g of tetraphenyl polypropylene glycol diphosphite (trade name LT-1000H, manufactured by Akishima Chemical Co., Ltd.) as a stabilizer,
0.3 g of dibutyltin dilaurate was added as a catalyst, and the mixed liquid was charged and mixed until the temperature of all the components reached 90 ° C. to impregnate the liquid raw material component with the powder raw material component. 800.4 g of the powdery raw material component prepared by the above method was sampled and put into a Banbury mixer having an internal volume of 1700 cc and a casing temperature of 150 ° C. On the other hand, D as a liquid component
OP (Di-2-ethylhexyl phthalate) 264.5g
And hexamethylene diisocyanate trimer (Nippon Polyurethane Co., Ltd., trade name Coronate HX) 70.9 g
(NCO / OH ratio = 0.85) was added to make a uniform solution, and the polymer polyol made by Nippon Polyurethane (trade name: Nipolan, Grade 406) heated to 80 ° C.
No. 7, 423 g of number average molecular weight of 2000) was added and mixed by stirring. This liquid was immediately put into the same apparatus, and was melted and kneaded at a speed of 40 rotations / minute for 25 minutes. The results are shown in Table 1.

Example 4 In impregnation of various materials of Example 3 into PVC, a polymer polyol made by Nippon Polyurethane (trade name Nipporan, grade 4067, number average molecular weight 2000) 79 was used.
PVC was impregnated with 3.1 g of the other liquid components according to the procedure of Example 3. 101 from this powdery raw material component
1.9 g was sampled and put into a Banbury mixer having an internal volume of 1700 cc and a casing temperature of 150 ° C. On the other hand, DOP (di-2-ethylhexyl phthalate) 264.5 g as a liquid component, hexamethylene diisocyanate trimer (Nippon Polyurethane Co., Ltd. trade name, Coronate HX) 70.9 g (NCO / OH ratio = 0. 85) was added to form a uniform solution, and the polymer polyol made by Nippon Polyurethane (trade name: Nipolan,
Grade 4067, number average molecular weight 2000) 211.5
g and mixed with stirring. This liquid was immediately put into the same apparatus, and was melted and kneaded at a speed of 40 rotations / minute for 25 minutes. The results are shown in Table 1.

Comparative Example 1 In the preparation of the liquid raw material component of Example 1, hexamethylene diisocyanate trimer (Nippon Polyurethane Co., Ltd.)
The same procedure as in Example 1 was carried out except that the order of compounding the product manufactured by Coronate HX) was the last. The results are shown in Table 1.

Comparative Example 2 In the powdery raw material component preparing step of Example 3, the powdery raw material component prepared by removing only the catalyst component and the liquid raw material component preparing step were mixed with DOP in the same amount in advance. ,
Next, 423 g of polymer polyol (trade name Nipporan, grade 4067, number average molecular weight 2000) made by Nippon Polyurethane heated to 80 ° C. was added and mixed by stirring, and finally, a trimer of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Co., Ltd., Product name Coronate HX)
The same procedure as in Example 3 was carried out except that 70.9 g (NCO / OH ratio = 0.85) was blended. The results are shown in Table 1.

[0047]

[Table 1]

[0048]

As is apparent from the above description, the composite obtained by the production method of the present invention has the F. E. And a polyvinyl chloride-based resin composition having excellent compression set.

Claims (4)

[Claims] 1. A polymer polyol is added to a product obtained by previously diluting a compound having 3 or more isocyanate groups with a plasticizer to prepare a uniformly dispersed liquid component, which is mixed with a polyvinyl chloride polymer and subjected to shear stress. A method for producing a polyvinyl chloride-based resin composition, which comprises heat-melting and kneading. 2. The production method according to claim 1, wherein the polyvinyl chloride polymer used is a polyvinyl chloride polymer impregnated with a urethanization reaction catalyst. A method for producing a resin composition. 3. The method according to claim 1, wherein the polyvinyl chloride polymer used is a polyvinyl chloride polymer impregnated with a urethanization reaction catalyst and a plasticizer. A method for producing a vinyl chloride resin composition. 4. The production method according to claim 1, wherein the polyvinyl chloride polymer used is a polyvinyl chloride polymer impregnated with a urethanization reaction catalyst, a plasticizer and a polymer polyol. And a method for producing a polyvinyl chloride resin composition.