JPH07292195A - Production of flexible polyvinyl chloride resin composition and production of flexible polyvinyl chloride composition molded product - Google Patents

Abstract

PURPOSE:To obtain the subject composition by using a conventional production unit with no need of any modification without declining in its production rate or causing fouling to the production unit. CONSTITUTION:A kneading under a molten state of 100 pts.wt. of polyvinyl chloride powder and 150-450 pts.wt. of a high-molecular plasticizer is conducted to prepare plasticizer-contg. polyvinyl chloride particles; subsequently, 100 pts.wt. of polyvinyl chloride powder is dry blended with 300-500 pts.wt. of the above plasticizer-contg. polyvinyl chloride particles followed by kneading in a molten state to obtain the objective flexible vinyl chloride-based resin composition comprising 100 pts.wt. of polyvinyl chloride and 40-150 pts.wt. of the high- molecular plasticizer. The other objective flexible polyvinyl chloride-based composition molded product is obtained by the above dry blending and then kneading in a molten state followed by conducting a molding process.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a soft polyvinyl chloride composition containing a polymer plasticizer and a method for producing a molded product of a soft polyvinyl chloride composition containing a polymer plasticizer.

[0002]

BACKGROUND OF THE INVENTION It is already known that a copolymer obtained from ethylene, carbon monoxide and an unsaturated ester serves as a plasticizer for polyvinyl chloride. When compounding such a polymer plasticizer into polyvinyl chloride, it is not always easy to uniformly mix it using a conventional apparatus for producing a soft polyvinyl chloride composition using a liquid plasticizer, In particular, it has been difficult to produce a soft polyvinyl chloride composition by adding a large amount of a polymer plasticizer.

In the conventional method for producing a soft polyvinyl chloride composition, first, polyvinyl chloride powder, a liquid plasticizer, and
Stabilizers, various additives such as lubricants are mixed by a dry stirring and mixing device such as a Henschel mixer, and the obtained powder is melt-kneaded by directly introducing it to a melt-kneading device such as a Banbury mixer without passing through a cooling mixer,
Next, it is common to perform calendar molding or the like through a mixing roll.

However, when the polyvinyl chloride powder and the polymer plasticizer are mixed by the above method, the following problems occur. For example, in a dry stirring mixer,
Usually, the temperature rises to 120 to 130 ° C, but a polymer plasticizer suitable as a plasticizer for polyvinyl chloride has a melting point of 40 to 6
Since the temperature is about 0 ° C., it is melted in the mixing device, and a part of it is driven to the wall surface of the device so that it is not mixed with polyvinyl chloride and the wall surface is contaminated. In addition, the molten polymer plasticizer is not completely taken into the polyvinyl chloride and adheres onto the polyvinyl chloride powder, causing stringing, deteriorating workability and accelerating the fouling of the device.

Further, in the conventional method, since the polymer plasticizer is liable to solidify into a lump, uniform mixing is difficult unless the polymer plasticizer is divided and added, and the production rate is sacrificed. There were difficulties. In addition, even in divided addition, the mixing device sometimes became dirty.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and it is possible to use the conventional apparatus for producing a soft polyvinyl chloride composition using a liquid plasticizer as it is, and to increase the production rate. An object of the present invention is to provide a method for producing a soft polyvinyl chloride composition in which a soft polyvinyl chloride composition containing a large amount of a polymer plasticizer can be obtained without lowering or fouling production equipment. At the same time, it is an object of the present invention to provide a method for producing a molded product of a soft polyvinyl chloride composition containing a polymer plasticizer in a considerable amount.

[0007]

SUMMARY OF THE INVENTION The method for producing a soft polyvinyl chloride composition according to the present invention comprises plasticizing agent-containing polyvinyl chloride particles obtained by melt-kneading 100 parts by weight of polyvinyl chloride powder and 150 to 450 parts by weight of a polymeric plasticizer. Then, 100 parts by weight of polyvinyl chloride powder and 30 to 500 parts by weight of the plasticizer-containing polyvinyl chloride particles are dry-blended, and then melt-kneaded to obtain the polymer plastic per 100 parts by weight of polyvinyl chloride. A soft polyvinyl chloride composition containing the agent in an amount of 40 to 150 parts by weight is obtained.

In the present invention, when the plasticizer-containing polyvinyl chloride particles are prepared, a part of the polymer plasticizer and the polyvinyl chloride powder are pre-mixed and then melt-kneaded, and the remaining polymer plasticizer is added. It is desirable to melt-knead, and it is desirable to add a stabilizer when dry blending the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles. Further, the polymer plasticizer is preferably an ethylene copolymer polymer plasticizer.

The method for producing a molded product of a soft polyvinyl chloride composition according to the present invention is to melt-knead 100 parts by weight of polyvinyl chloride powder and 150 to 450 parts by weight of a polymeric plasticizer to obtain plasticizer-containing polyvinyl chloride particles. Is prepared, and then 100 parts by weight of polyvinyl chloride powder and 30 to 500 parts by weight of the plasticizer-containing polyvinyl chloride particles are dry-blended,
Thereafter, the mixture is melt-kneaded and molded to obtain a soft polyvinyl chloride composition molded product containing the polymer plasticizer in an amount of 40 to 150 parts by weight per 100 parts by weight of polyvinyl chloride.

In the present invention, when the plasticizer-containing polyvinyl chloride particles are prepared, a part of the polymer plasticizer and the polyvinyl chloride powder are premixed and then melt-kneaded, and the remaining polymer plasticizer is added. It is desirable to melt-knead, and it is desirable to add a stabilizer when dry blending the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles. Further, the polymer plasticizer is preferably an ethylene copolymer polymer plasticizer.

The method for producing a molded product of such a soft polyvinyl chloride composition is suitable as a method for producing a molded product such as a film.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The method for producing a soft polyvinyl chloride composition and the method for producing a molded product of a soft polyvinyl chloride composition according to the present invention will be specifically described below.

In the method for producing a soft polyvinyl chloride composition according to the present invention, a polyvinyl chloride powder and a polymeric plasticizer are melt-kneaded to prepare plasticizer-containing polyvinyl chloride particles,
Next, the polyvinyl chloride powder and the polyvinyl chloride particles containing the plasticizer are dry blended, and then melt-kneaded.

First, the polyvinyl chloride and polymer plasticizer used in the present invention will be described. As the polyvinyl chloride (PVC), a vinyl chloride homopolymer or a copolymer of vinyl chloride and another comonomer is used.

Other comonomers copolymerizable with vinyl chloride include α-olefins such as ethylene and propylene; vinyl acetate, acrylic acid esters, alkyl vinyl ethers, vinyl bromide, vinyl fluoride, vinylidene chloride, styrene, Examples thereof include vinyl compounds such as acrylonitrile and vinylidene compounds.

When polyvinyl chloride is a copolymer,
It may be a random copolymer or a graft copolymer. As an example of the graft copolymer, for example, an ethylene / vinyl acetate copolymer or a thermoplastic urethane polymer as a trunk polymer, to which vinyl chloride is graft-polymerized, can be mentioned.

The polyvinyl chloride is preferably used in the form of powder, and the one having a particle size of 0.1 to 1000 μm is preferably used. As the polymer plasticizer, known polymer plasticizers can be used, and examples thereof include ethylene / vinyl acetate / carbon monoxide copolymer, ethylene / (meth) acrylic acid ester / carbon monoxide copolymer, acetic acid. An ethylene copolymer polymer plasticizer such as an ethylene / vinyl acetate copolymer having a high vinyl content can be mentioned as a preferable example.

The ethylene / vinyl acetate / carbon monoxide copolymer or the ethylene / (meth) acrylic acid ester / carbon monoxide copolymer usually has a constitutional unit derived from ethylene of 40 to 80% by weight, preferably 60-70% by weight
Of the structural unit derived from vinyl acetate or (meth) acrylic acid ester, present in a proportion of
It is preferably present in a proportion of 20 to 35% by weight, and the constituent unit derived from carbon monoxide is desirably present in a proportion of 5 to 30% by weight, preferably 5 to 15% by weight.

The (meth) acrylic acid ester that can be a copolymerization component of the ethylene / (meth) acrylic acid ester / carbon monoxide copolymer is methyl acrylate,
Examples thereof include ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate and the like.

Further, in the ethylene / vinyl acetate copolymer having a high vinyl acetate content, the constitutional unit derived from ethylene is 20 to 60% by weight, preferably 30 to 50% by weight, derived from vinyl acetate. 40 to 8 structural units
It is desirable to be present in a proportion of 0% by weight, preferably about 50 to 70% by weight.

Such a polymer plasticizer is a low-melting polymer plasticizer, and its melting point is preferably about 40 to 60 ° C. The melt flow rate is 0.1
It is preferable to use one having a viscosity of up to 100 g / 10 minutes (190 ° C., 2160 g load).

In the present invention, first, polyvinyl chloride and a polymer plasticizer are melt-kneaded at a temperature of 100 to 150 ° C. to prepare plasticizer-containing polyvinyl chloride particles. To prepare the plasticizer-containing polyvinyl chloride particles, the polymer plasticizer is used in an amount of 150 to 450 parts by weight, preferably 200 to 400 parts by weight, based on 100 parts by weight of polyvinyl chloride. The plasticizer-containing polyvinyl chloride particles can be prepared using, for example, a twin-screw extruder or a Banbury mixer.
It is particularly preferable to use a twin-screw extruder. When preparing the plasticizer-containing polyvinyl chloride particles, the additives described below may be used, and are usually used in an amount of about 5 to 50 parts by weight with respect to 100 parts by weight of polyvinyl chloride.

The plasticizer-containing polyvinyl chloride particles thus obtained are usually in the form of pellets and have a particle size of 1.5.
It is preferably ˜5 mm. When the particle size of the plasticizer-containing polyvinyl chloride particles is within the above range, it is easy to mix with polyvinyl chloride in a later step, and a uniform composition is easily obtained.

In preparing the plasticizer-containing polyvinyl chloride particles, as the amount of the polymer plasticizer increases, uniform melt-kneading becomes difficult. Therefore, it is preferable that a part of the polymer plasticizer and polyvinyl chloride are premixed and melt-kneaded to form a uniform melt-kneaded product, and the balance of the polymer plasticizer is further added to the mixture and melt-kneaded. . A suitable device that can be used for such melt-kneading is a twin-screw extruder with a side feed, in which the first melt-kneading is performed in the zone up to the side feed part, and the remaining polymer plasticizer is added in the side feed part. In addition, a method of continuing melt-kneading can be adopted.

In this case, the polymer plasticizer is premixed in an amount of 80 to 1 with respect to 100 parts by weight of polyvinyl chloride.
Premixing and melt-kneading are carried out in an amount of about 20 parts by weight, and then 70 to 3 per 100 parts by weight of polyvinyl chloride.
It is preferable to add 30 parts by weight, particularly 100 to 300 parts by weight, and further melt-knead.

Next, the polyvinyl chloride powder and the polyvinyl chloride particles containing the plasticizer are mixed (dry blended) using a dry stirring mixer. The polyvinyl chloride used here and the polyvinyl chloride used when preparing the plasticizer-containing polyvinyl chloride particles may be the same or different. For example, a vinyl chloride copolymer can be used to prepare the plasticizer-containing polyvinyl chloride particles, and a vinyl chloride homopolymer can be used as the polyvinyl chloride to be mixed with the plasticizer-containing polyvinyl chloride particles.
The mixing of the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles can be performed using, for example, a Henschel mixer.

When the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles are mixed, the plasticizer-containing polyvinyl chloride particles are 30 to 500 parts by weight, preferably 50 to 300 parts by weight, per 100 parts by weight of the polyvinyl chloride powder. It is desirable to mix in parts. When the relative amount of polyvinyl chloride powder is small, a large amount of plasticizer-containing polyvinyl chloride particles, which has a high processing cost, is used, which is not economical. Further, when a liquid additive is used, it becomes difficult for the plasticizer to be incorporated into the polyvinyl chloride powder.

When the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles are mixed, various additives may be further mixed. In that case, the polyvinyl chloride powder and various additives are mixed. Then, this mixture is mixed with the polyvinyl chloride particles containing the plasticizer.

Examples of the additives used here include stabilizers such as zinc fatty acid salt, calcium fatty acid salt and barium fatty acid salt; ultraviolet absorbers; lubricants; inorganic fillers such as calcium carbonate, silica and clay; Colorants: plasticizers other than the above-mentioned polymer plasticizers, for example, liquid plasticizers such as dioctyl phthalate, dibutyl phthalate, and dinonyl phthalate, and the like, and these are appropriately blended depending on the purpose of use. The amount of the additive used varies depending on the intended resin composition, but is usually polyvinyl chloride powder 1
It is about 5 to 50 parts by weight with respect to 00 parts by weight.

In the step of dry blending the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles, 130
Even if the temperature rises to around ℃, the polymer plasticizer in the polyvinyl chloride particles containing plasticizer does not start to melt, so the polymer plasticizer melts in the mixing device, polluting the wall surface and melting. The polymer plasticizer does not adhere to the polyvinyl chloride powder to cause stringing, deteriorating workability and promoting troubles such as soiling of the device.

The mixture of the polyvinyl chloride powder thus obtained and the polyvinyl chloride particles containing the plasticizer is introduced into the melt-kneading apparatus as it is with or without cooling.
Melt kneading at a temperature of 50 to 180 ° C. to obtain a soft polyvinyl chloride composition. Examples of the melt-kneading device used here include a Banbury mixer and a mixing roll.

The resulting soft polyvinyl chloride composition contains 40 to 50 parts by weight of a polymer plasticizer per 100 parts by weight of polyvinyl chloride.
It is contained in an amount of 150 parts by weight, preferably 60 to 120 parts by weight. When the content of the polymer plasticizer is less than the above range, it is not so difficult to mix the polyvinyl chloride and the polymer plasticizer, and there is not much benefit to adopt the method of the present invention.

By preparing the plasticizer-containing polyvinyl chloride particles as described above and then melt-mixing the plasticizer-containing polyvinyl chloride particles with the polyvinyl chloride, agglomeration troubles of the polymer plasticizer and equipment stains are prevented. No trouble occurs, and a soft polyvinyl chloride composition in which polyvinyl chloride is uniformly dispersed can be obtained in a short time.

The soft polyvinyl chloride composition obtained is molded into various molded articles by various molding devices. For example, when forming into a film, it is formed into a desired shape by calendering after passing through a mixing roll or the like.

Next, preferable examples of the method for producing the soft polyvinyl chloride composition of the present invention will be specifically illustrated. That is, first, 100 parts by weight of polyvinyl chloride, 80 to 120 parts by weight of a polymer plasticizer and, if necessary, additives such as a stabilizer are premixed and melt-kneaded at 100 to 150 ° C.
100 to 30 parts by weight per 100 parts by weight of polyvinyl chloride
A polymer plasticizer in an amount of 0 parts by weight is added and melt-kneading is continued to prepare plasticizer-containing polyvinyl chloride particles.

Next, 100 parts by weight of polyvinyl chloride and, if necessary, additives such as a stabilizer are put into a mixing stirrer and mixed and stirred. The temperature of the contents is 120 to 13 depending on the heat of stirring.
When the temperature reached 0 ° C., the stirring was stopped, 30 to 500 parts by weight of the plasticizer-containing polyvinyl chloride particles prepared above were added, and the mixture was stirred with stirring to obtain a powder mixture.

Then, the powder mixture is heated to 150 to 180 ° C.
And melt-kneaded to obtain a soft polyvinyl chloride composition. Further, the obtained soft polyvinyl chloride composition is molded into various molded articles by various molding devices.

According to the present invention, a soft polyvinyl chloride composition containing a considerable amount of a polymer plasticizer and a molding made of the composition are produced by diverting the conventional apparatus for producing a soft polyvinyl chloride composition. Goods can be manufactured. Further, the polymer plasticizer does not melt and agglomerate in the dry blending step of the polyvinyl chloride powder and various additives, or the inner wall surface of the tank of the stirring and mixing apparatus does not become dirty. Furthermore, a soft polyvinyl chloride composition in which polyvinyl chloride is uniformly dispersed can be obtained in a short time.

[0039]

According to the method for producing a soft polyvinyl chloride composition of the present invention, the conventional apparatus for producing a soft polyvinyl chloride composition can be used as it is, and further, the production speed is lowered and the production apparatus is soiled. It is possible to obtain a soft polyvinyl chloride composition in which a polymer plasticizer is blended and a molded article made of the composition, without causing the above phenomenon.

[0040]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited to these examples.

[0041]

Example 1 Ethylene / vinyl chloride copolymer [Leuron E1050, average degree of polymerization 1050, manufactured by Tosoh Corporation]
100 parts by weight, ethylene / n-butyl acrylate / carbon monoxide copolymer (n-butyl acrylate content: 30% by weight,
Carbon monoxide content: 10% by weight, MFR: 25 dg / min)
100 parts by weight and the total amount of the additives shown in Table 1 were 9.6.
After preliminarily mixing parts by weight using a tumbler blender, a co-rotating twin-screw extruder having a side feed function [KTX-80, 77 mmφ, L manufactured by Kobe Steel, Ltd.]
/ D = 30] and the screw rotation speed is 230 mi.
n ^-1 , cylinder temperature 110 to 120 ° C, die temperature 1
The mixture was kneaded at 10 ° C. to prepare polyvinyl chloride particles containing a plasticizer at about 120 kg / hour. At this time, 100 parts by weight of the ethylene / vinyl chloride copolymer was added to 100 parts by weight of the ethylene / n-butyl acrylate / carbon monoxide copolymer through the vent port located substantially in the center of the cylinder length direction.
Parts by weight were fed using a gravimetric feeder. Further, a volatile component existing in the cylinder was removed from the vent port located between the vent port and the cylinder head using a vacuum pump (vacuum degree of 20 torr) to stabilize the extrusion.

The appearance of the extruded strands was smooth, glossy and transparent. No blocking phenomenon was observed in the obtained plasticizer-containing polyvinyl chloride particles. Further, a gel having a diameter of 50 μm or more (a particle of an unmelted ethylene / vinyl chloride copolymer) in a pressed film having a thickness of 200 μm obtained by hot-pressing the particles at 180 ° C.
Was 0 / cm ² using a magnifying projector, and it was confirmed that polyvinyl chloride was uniformly dispersed in the plasticizer-containing polyvinyl chloride particles.

Next, polyvinyl chloride (vinyl chloride 300)
0M, average degree of polymerization 1100, manufactured by Mitsui Toatsu Chemicals, Inc. 1
00 parts by weight, 2 parts by weight of Ba / Zn stabilizer and 2 parts by weight of epoxidized soybean oil were charged into a 20 liter Henschel mixer, and mixed and stirred at a rotation speed of 1000 min ⁻¹ . When the temperature of the contents reached 125 ° C. due to the heat of stirring, stirring was stopped, 300 parts by weight of the plasticizer-containing polyvinyl chloride particles prepared above were added, and the mixture was rotated at 500 min ⁻¹ for 1 revolution.
The mixture was mixed and stirred for 1 minute, and the powder mixture was discharged. The fluidity of the powder mixture upon discharge was good. Further, after the discharge, no deposit was found on the wall surface, the flow dividing plate, etc. in the Henschel mixer tank.

Then, the powder mixture obtained as described above was subjected to a roll surface temperature of 16 using a 6-inch test roll.
The mixture was kneaded at 0 ° C for 5 minutes to prepare a soft polyvinyl chloride composition. At this time, the charged powder mixture was not adhered to the back roll and wound up. The number of gels having a diameter of 50 μm or more in the press film having a thickness of 200 μm obtained by hot-pressing the obtained roll sheet at 180 ° C. was counted using a magnifying projector, and it was 100 pieces / cm ² , and this soft poly In the vinyl chloride composition, polyvinyl chloride was almost uniformly dispersed. In addition, 1 roll sheet of this composition
A press sheet having a thickness of 1 mm was prepared by hot pressing at 80 ° C, and the obtained press sheet was JISK6301.
A No. 3 dumbbell test piece was prepared and a tensile test was performed at 23 ° C. using an autograph at a tensile speed of 200 mm / min.
The compounding ratio and various characteristics are shown in Tables 1 and 2.

[0045]

Example 2 A plasticizer was prepared in the same manner as in Example 1 except that the amount of ethylene / n-butyl acrylate / carbon monoxide copolymer supplied from the vent port was changed to 200 parts by weight. Polyvinyl chloride particles containing were prepared.
In the obtained plasticizer-containing polyvinyl chloride particles, it was confirmed from the appearance of the strand and gel count that the polyvinyl chloride was uniformly dispersed.

Next, in Example 1, the amount of the plasticizer-containing polyvinyl chloride particles charged into the Henschel mixer was changed to 20.
A powder mixture was prepared in the same manner as in Example 1 except that the amount was changed to 0 part by weight. The fluidity of the resulting powder mixture upon discharge was good.

Then, the obtained powder mixture was kneaded in the same manner as in Example 1 by using a 6-inch test roll. At this time, the powder mixture did not contaminate the back roll. Further, in the obtained soft polyvinyl chloride composition, polyvinyl chloride was almost uniformly dispersed. With respect to this composition, a test piece was prepared in the same manner as in Example 1 and various tests were conducted. The compounding ratio and various characteristics are shown in Tables 1 and 2.

[0048]

Example 3 A plasticizer was prepared in the same manner as in Example 1 except that the amount of ethylene / n-butyl acrylate / carbon monoxide copolymer supplied from the pentoport was changed to 300 parts by weight. Polyvinyl chloride particles containing were prepared.
In the obtained plasticizer-containing polyvinyl chloride particles, polyvinyl chloride was almost uniformly dispersed, but the plasticizer-containing polyvinyl chloride particles had a slight blocking.

Next, in Example 1, the amount of the plasticizer-containing polyvinyl chloride particles charged into the Henschel mixer was changed to 17
A powder mixture was prepared in the same manner as in Example 1 except that the amount was changed to 0 part by weight. The fluidity of the resulting powder mixture upon discharge was good.

Then, the obtained powder mixture was kneaded by using a 6-inch test roll in the same manner as in Example 1. At this time, the material did not contaminate the back roll. Further, in the obtained soft polyvinyl chloride composition, polyvinyl chloride was almost uniformly dispersed. With respect to this composition, a test piece was prepared in the same manner as in Example 1 and various tests were conducted. The compounding ratio and various characteristics are shown in Tables 1 and 2.

[0051]

Comparative Example 1 A plasticizer was prepared in the same manner as in Example 1 except that the ethylene / n-butyl acrylate / carbon monoxide copolymer supplied from the vent port was changed to 400 parts by weight. Polyvinyl chloride particles containing were prepared.
The extruded strand was opaque and had a rough surface.
Further, the gel count was as bad as 4000 pieces / cm ^2, and apparently it was considered that the dispersion of the ethylene / vinyl chloride copolymer was insufficient.

Next, in Example 1, the amount of the plasticizer-containing polyvinyl chloride particles charged into the Henschel mixer was changed to 15
A powder mixture was prepared in the same manner as in Example 1 except that the amount was changed to 0 part by weight. At this time, the contents were fused and agglomerated in the Henschel mixer tank.

Then, the obtained bulk mixture was kneaded in the same manner as in Example 1 using a 6-inch test roll to obtain a soft polyvinyl chloride composition. Example 1 for this composition
Similarly to the above, a test piece was prepared and various tests were performed. The compounding ratio and various characteristics are shown in Tables 1 and 2.

[0054]

Comparative Example 2 A 20-liter Henschel mixer was used except that 100 parts by weight of the same polyvinyl chloride as used in Example 1 and 100 parts by weight of ethylene / n-butyl acrylate / carbon monoxide copolymer were used. A powder mixture was prepared by stirring and mixing in the same manner as in Example 1. At this time, in the Henschel mixer tank, the ethylene / n-butyl acrylate / carbon monoxide copolymer was melted and fused to the wall surface, and the contents were lumped.

Then, the obtained bulk mixture was kneaded using a 6-inch test roll in the same manner as in Example 1 to obtain a soft polyvinyl chloride composition. Example 1 for this composition
Similarly to the above, a test piece was prepared and various tests were performed. The compounding ratio and various characteristics are shown in Tables 1 and 2.

As shown in Table 2, the method of the present invention provided a soft polyvinyl chloride composition in which polyvinyl chloride was uniformly dispersed without contamination of the melt-kneading device. The obtained soft polyvinyl chloride composition is excellent in tensile strength at break and elongation at break.

[0057]

[Table 1]

[0058]

[Table 2]

Claims (9)

[Claims] 1. 100 parts by weight of polyvinyl chloride powder and 150 to 450 parts by weight of a polymer plasticizer are melt-kneaded to prepare polyvinyl chloride particles containing a plasticizer, and then 100 parts by weight of polyvinyl chloride powder, 30 to 500 parts by weight of the plasticizer-containing polyvinyl chloride particles are dry-blended and then melt-kneaded to obtain polyvinyl chloride 10
A method for producing a soft polyvinyl chloride composition, which comprises obtaining a soft polyvinyl chloride composition containing the polymer plasticizer in an amount of 40 to 150 parts by weight per 0 part by weight. 2. When preparing the plasticizer-containing polyvinyl chloride particles, a part of the polymer plasticizer and the polyvinyl chloride powder are premixed and then melt-kneaded, and the remaining polymer plasticizer is added and melted. The method for producing a soft polyvinyl chloride composition according to claim 1, wherein kneading is performed. 3. The method for producing a soft polyvinyl chloride composition according to claim 1, wherein the polymer plasticizer is an ethylene copolymer polymer plasticizer. 4. The method for producing a soft polyvinyl chloride composition according to claim 1, wherein an additive is added when dry blending the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles. . 5. 100 parts by weight of polyvinyl chloride powder and 150 to 450 parts by weight of a polymeric plasticizer are melt-kneaded to prepare polyvinyl chloride particles containing a plasticizer, and then 100 parts by weight of polyvinyl chloride powder, 30 to 500 parts by weight of the plasticizer-containing polyvinyl chloride particles are dry blended, and then melt-kneaded and molded to 40 to 150 parts of the polymer plasticizer with respect to 100 parts by weight of polyvinyl chloride.
A method for producing a molded product of a soft polyvinyl chloride composition, which comprises molding a molded product of a soft polyvinyl chloride composition containing an amount of part by weight. 6. When preparing the plasticizer-containing polyvinyl chloride particles, a part of the polymer plasticizer and the polyvinyl chloride powder are premixed and then melt-kneaded, and the remainder of the polymer plasticizer is added and melted. The method for producing a soft polyvinyl chloride composition molded article according to claim 5, wherein kneading is performed. 7. The method for producing a soft polyvinyl chloride composition according to claim 5, wherein the polymer plasticizer is an ethylene copolymer polymer plasticizer. 8. The method for producing a soft polyvinyl chloride composition according to claim 5, wherein an additive is added when dry blending the polyvinyl chloride powder and the plasticizer-containing polyvinyl chloride particles. . 9. The molded article is a film.
9. The method for producing a soft polyvinyl chloride composition molded article according to any one of 8 above.