JP2940665B2 - Purging agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a saponified ethylene-vinyl acetate copolymer (hereinafter referred to as E) in an extruder.
VOH), polyvinyl alcohol (hereinafter P)
More specifically, the present invention relates to purging agents for resins such as VA), polyamide resins (hereinafter, abbreviated as PA), and more specifically, extrudes the resin remaining in the melt flow path in an extruder, and quickly extrudes the resin again. When introduced into the channel,
The present invention relates to a purging agent in which product defects such as foreign matter and streaks due to the residual purging agent are significantly improved.

[0002]

2. Description of the Related Art Conventionally, resins such as EVOH, PVA, and PA have excellent gas barrier properties and have been used by being molded into packaging films and containers for foods and the like.
However, if the resin is melt-extruded for a long time during such molding, the resin stays in the resin flow path, causing gelation, deterioration, decomposition, etc., and streaks in the product. When the melt extruder is restarted after the operation of the melt extruder is stopped, the gel and the decomposed product of the resin existing in the resin flow path are discharged for a long time. Results in enormous time and product loss in obtaining a normal product.

[0003] In order to solve these problems, high-density polyethylene (HDP) must be used when abnormalities such as gels, streaks, or bumps occur during long-time operation or when the operation is stopped.
E), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polystyrene (PS),
A method has been adopted in which polypropylene (PP) or the like is used as a purging agent (purge resin), and the inside of the resin channel is replaced (purged) with the purging agent.

Further, in order to shorten the purging time, the EV
Methods such as using a purging agent having a higher viscosity than the resin to be purged such as OH, PVA, and PA, lowering the extrusion temperature, and increasing the discharge amount are employed, but a large amount of the purging agent is required. And the operation is complicated. When a purging agent having a higher viscosity than the resin to be purged is used, the time required for replacing the resin to be purged with the purging agent is shortened. The occurrence of this phenomenon continues for a long period of time, resulting in an increase in product loss. In order to improve this, when replacing the purging agent with the resin to be purged, a method of stepwise switching to a purging agent having a low viscosity or an operation of changing the extrusion temperature are performed, but the operation is complicated. However, there is a problem that time loss is large.

Therefore, as a purging agent for EVOH, when the purging agent is replaced with a resin to be purged, or when the melt extruder is restarted after being stopped, gels, spots, and lines are eliminated in a short time, thereby shortening the time required for commercialization. Japanese Patent Application Laid-Open No. 1-178545 discloses a purging agent obtained by blending a polyamide / polyether copolymer, a polyester / polyether copolymer, a polyamide / polyester / polyether copolymer with EVOH. -2
Japanese Patent Application Laid-Open No. 79518/79 discloses a purging agent in which a polyolefin or a polyolefin (/ EVOH blend) is mixed with a Group 2 metal salt, and JP-A-5-269754 discloses an EVOH or the like satisfying a specific melt viscosity index (melt index). Purging agents comprising the following resins are disclosed.

[0006]

However, the purging agent disclosed in JP-A-1-178545 described above is
Since the EVOH and the polyamide elastomer are used, the purging agent itself has poor stability and foreign substances such as gels and butters may be generated even during purging, and the purging agent disclosed in JP-A-5-279518 discloses
As a result of a detailed study by the present inventor, a small amount of purging agent remains in the extruder (metal surface) after purging, which may lead to the generation of foreign matters as described above. Further, Japanese Patent Application Laid-Open No. 5-269754 discloses The purging agent has a problem that the viscosity at the time of heating is low (it becomes very low after heating for 300 minutes), which causes an unpleasant odor, and the product may be smelled, which is not preferable.

[0007]

Means for Solving the Problems Accordingly, the present inventors have conducted intensive studies in order to solve such a problem, and as a result, the present invention comprises a hydrophobic thermoplastic resin (A) and a hydrophilic thermoplastic resin (B). Compounding weight ratio (A) / (B) is 100/0 to 30
/ 70, and the purging agent containing 0.01 to 40 parts by weight of the plasticizer (C) of the resin to be purged with respect to 100 parts by weight of (A + B) reduces the purging time and reduces product loss. The present invention has been completed by finding that purging can be carried out more effectively, and the purging can be performed more effectively without fear of generation of an offensive odor.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically. Hydrophobic thermoplastic resin (A) used in the present invention
Examples thereof include a polyolefin-based resin and a polystyrene-based resin, and a polyolefin-based resin is preferably used. Examples of such polyolefin resins include high-density polyethylene, medium-density polyethylene, (linear) low-density polyethylene, ultra-low-density polyethylene, vinyl acetate and acrylate, or butene, hexene and 4-methyl-
Polyethylene copolymerized with α-olefins such as 1-pentene, polypropylene homopolymer, polypropylene graft-copolymerized with ethylene, polypropylene copolymerized with α-olefins such as 4-methyl-1-pentene, poly-1- Modified polyolefin-based resins obtained by copolymerizing or graft-polymerizing butene, poly-4-methyl-1-pentene and the above-mentioned polyolefins with unsaturated carboxylic acids and their anhydrides, vinylsilane-based compounds, epoxy group-containing compounds, and the like. Linear low-density polyethylene, low-density polyethylene, and polypropylenes are preferably used, and the MI (melt index, measured at 190 ° C. under a load of 2160 g) of the polyolefin resin is the MI of the resin to be purged (as described above). The same applies to the following.) It is preferably 0.1 to 80 g / 10 min, more preferably 0.2 to 70 g / 10 min. If the MI is less than 0.1 g / 10 min, the melt extrudability becomes insufficient and conversely exceeds 80 g / min. The performance of discharging the resin to be purged is undesirably reduced. In addition, as the hydrophilic thermoplastic resin (B), EVOH, PVA, PA, or the like is used.

Such EVOH has an ethylene content of 15 to 7
0 mol%, preferably 20 to 60 mol%, and a degree of saponification of 90
% Or more, preferably 95% or more. If the ethylene content is less than 15 mol%, melt extrusion molding becomes difficult, and if it exceeds 70 mol%, the ability to retain the plasticizer (C) decreases. Is not preferred. On the other hand, if the saponification degree is less than 90%, the thermal stability of EVOH deteriorates, which is not preferable. Such EVOH may further contain a small amount of propylene, isobutene, α-
Α-olefins such as octene, α-dodecene and α-octadecene, unsaturated carboxylic acids or salts thereof, partial alkyl esters, complete alkyl esters, nitriles, amides,
A comonomer such as an anhydride, unsaturated sulfonic acid or a salt thereof may be contained.

The PVA is not particularly limited as long as it can be melt-extruded, and examples thereof include modified PVA and PVA containing specific additives. Examples of modified PVA include an oxyalkylene group. PVA-based resin. The oxyalkylene group content of such an oxyalkylene group-containing PVA-based resin is 1 to 60% by weight, preferably 2 to 50% by weight, particularly preferably 3 to 40% by weight. On the other hand, if it exceeds 60% by weight, the thermal stability deteriorates, which is not preferable. The average degree of condensation of the polyoxyalkylene group is 3
Those having an average degree of condensation of less than 3 are inferior in extrusion moldability and have problems such as a decrease in industrial productivity when an oxyalkylene group is introduced.
When it is more than 00, problems such as a decrease in extrusion moldability occur, and preferably 3 to 50, more preferably 5 to 30. Here, the average degree of condensation refers to n in the chemical formulas represented by the following chemical formulas 1 and 2.

[0011]

CH ₂ ＣＲCR ₀ —CH ₂ —O — (— CHR ₁ —CHR ₂ O—) n—X (where X is H or —CR ₃ or R ₃ ) O, where R ₀ , R ₁ , R ₂ and R ₃ represent hydrogen or an alkyl group.

CH ₂ ＣＨCH—O — (— CHR ₁ —CHR ₂ O—) n—X (where X is H or —CR ₃ or R ₃ ) ‖O where R ₀ and R ₁ , R ₂ and R ₃ represent hydrogen or an alkyl group.

The saponification degree of the fatty acid vinyl ester unit in the oxyalkylene group-containing PVA resin is 60 to 10.
It is 0 mol%, and if it is less than 60 mol%, the thermal stability is lowered, which is not preferable. Examples of PVA containing additives include polyhydric alcohols (ethylene glycol, 1,
2-propanediol, 1,3-propanediol,
1,2-butanediol, 1,3-butanediol,
PVA containing additives such as 1,4-butanediol, glycerin, propylene glycol, and polyethylene oxide) can be used, and the content is preferably 0.1 to 50% by weight, more preferably 0.1 to 50% by weight. 2-40
% By weight is preferred. If the content is less than 0.1% by weight, melt extrusion cannot be performed, and if it exceeds 50% by weight, the viscosity decreases significantly, which is not preferable.

The average degree of polymerization of PVA used for these modified PVAs and PVAs containing additives is 100 to 100%.
3000 is preferable, and 300-2000 is more preferable. The saponification degree is preferably from 80 to 100 mol%, and more preferably from 90 to 100 mol%. In addition, these PVA
Are copolymerized with α-olefins (ethylene, propylene, long-chain α-olefins, etc.) and ethylenically unsaturated carboxylic acid monomers (acrylates, methacrylates, acrylonitrile, vinyl chloride, vinyl ethers, etc.).
If it is about 0 mol% or less, it may be contained.

Further, as PA, polycapramide (nylon-6), poly-ω-aminoheptanoic acid (nylon-7), polyundecaneamide (nylon 11), polylaurinlactam (nylon-12), polyethylenediamine adipa Amide (nylon-2,6), polytetramethylene adipamide (nylon-4,6), polyhexamethylene adipamide (nylon-6,6), polyhexamethylene sebacamide (nylon-2,10) , Polyhexamethylene dodecamide (nylon-6,12), polyoctamethylene adipamide (nylon-8,6), polydecanomethylene adipamide (nylon-10,6), polydodecamethylene sebacamide ( Nylon-10,8) or caprolactam / laurin lactone copolymer (nylon-6 / 12 , Caprolactam / .omega.-aminononanoic acid copolymer (nylon -6/9), caprolactam /
Hexamethylene diamine adipate copolymer (nylon-6 / 6,6), lauryl lactam / hexamethylene diamine adipate copolymer (nylon-12 / 6,
6), hexamethylenediamine adipate / hexamethylenediamine sebacate copolymer (nylon-6,6 /
6,10), ethylenediamine adipate / hexamethylenediamine adipate copolymer (nylon-2,6 /
6,6), caprolactam / hexamethylenediamine adipate / hexamethylenediamine sebacate copolymer (nylon-6,6 / 6,10), and the like. Further, amorphous polyamide and polycondensate are also used. .

PA obtained by polycondensation of an aliphatic diamine and an aromatic dicarboxylic acid can also be used. Examples of such an aliphatic diamine include hexamethylene diamine, 2,2,4-trimethylhexamethylene diamine, and the like. 2,4,4-trimethylhexamethylenediamine, 2-methylpentamethylenediamine, bis- (4-
Aminohexyl) -methane, 2,2-bis- (4-aminohexyl) -isopropylidine, 1,4- (1,3)
-Diaminocyclohexane, 1,5-diaminopentane, 1,4-diaminobutane, 1,3-diaminopropane, 2-ethyldianobutane, and the like. These diamines may be used alone or in combination. Can be used. Examples of the aromatic dicarboxylic acid include isophthalic acid, terephthalic acid, alkyl-substituted isophthalic acid, alkyl-substituted terephthalic acid, naphthalenedicarboxylic acid, and diphenyl ether dicarboxylic acid. One or more of these dicarboxylic acids can be used simultaneously.

The compounding weight ratio of the hydrophobic thermoplastic resin (A) and the hydrophilic thermoplastic resin (B) is as follows: hydrophobic thermoplastic resin (A) / hydrophilic thermoplastic resin (B) = 100/0 3
0/70, preferably 100/0 to 35/65, more preferably 100/0 to 40/60. When the ratio (A) / (B) exceeds 30/70, the mixed resin composition is undesirably attached to the resin flow path. The greatest feature of the present invention is that the hydrophobic thermoplastic resin (A) and the hydrophilic thermoplastic resin (B) further contain a plasticizer (C) as a resin to be purged. The plasticizer (C) is not particularly limited as long as it can be a plasticizer having a plasticizing effect on the resin to be purged. That is, it means a compound capable of lowering the melting point of the resin to be purged by 3 ° C. or more (preferably 50 to 5 ° C.) with respect to the resin to be purged.

As the plasticizer (C), for example, when the resin to be purged is EVOH or PVA, alcohols such as methanol, ethanol, propanol, butanol and pentanol, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol, glycerin, Diglycerin, triglycerin, 1,
2-propanediol, 1,3-propanediol,
1,2-butanediol, 1,3-butanediol,
1,4-butanediol, 1,5-pentanediol,
1,6-hexanediol, 1,5-hexanediol, 1,3,6-hexanetriol, 1,3,5-hexanetriol, neopentyl glycol, trimethylolpropane, pentaerythritol stearate,
Alcohols such as pentaerythritol adipate, dipentaerythritol pyrrolidonecarboxylate, dipentaerythritol glutamate, polyhydric alcohols such as maleic anhydride-modified wood rosin pentaerythritol and sorbitol, mannitol, sugar alcohols such as dursit, and the like. Are aromatic sulfonamides such as N-ethyl-o, p-toluenesulfonamide, o, p-toluenesulfonamide, N-cyclohexyl-p-toluenesulfonamide, urea, molasses, polyethyleneoxazoline, polyvinylpyrrolidone, polyvinyl For example, glycerin and sorbit are useful. When the resin to be purged is PA, long-chain fatty acid amides such as lauramide, N-ethyl-toluenesulfonamide Aromatic sulfonamides such as N-butyl-toluenesulfonamide and o, p-toluenesulfonamide; oxybenzoic acid esters such as octyl oxybenzoate; and other oxy group-containing phthalic acid ester compounds. Lauramide, o, p-toluenesulfonamide, octyl oxybenzoate are useful.

The amount of the plasticizer (C) added is 0.01 to 40 parts by weight, preferably 0.2 to 35 parts by weight, more preferably 0 to 100 parts by weight in total of (A) and (B). If the amount of the plasticizer (C) is less than 0.01 part by weight, the effect of discharging the resin to be purged adhered in the resin flow path is not practical, and the plasticizer (C) is not practical. If the addition amount of the agent exceeds 40 parts by weight, the melt viscosity of the purging agent is too low, and the resin to be purged in the resin flow path cannot be discharged, which is inappropriate. The order of mixing (mixing) each of the components (A) to (C) is not particularly limited and can be arbitrarily performed. Preferably, the hydrophobic thermoplastic resin (A) and the hydrophilic thermoplastic resin (B) are used. And a method in which the plasticizer (C) is directly supplied to the injection molding machine or the extrusion molding machine as it is or as a purging agent, or the hydrophobic thermoplastic resin (A) is mixed with the hydrophilic thermoplastic resin (B) and the plasticizer ( A method in which the mixture of (C) is supplied to an extruder and pelletized is employed.

The purging agent of the present invention may contain, if necessary, a heat stabilizer such as hindered phenol or hindered amine, calcium acetate, magnesium acetate,
Metal salts such as silica, titanium oxide, and calcium carbonate, inorganic powders, metal soaps, silicon-based, fluorine-based fatty acid esters, amide-based lubricants, pigments, foaming agents, surfactants, and the like as long as the effects of the present invention are not impaired. Can be added within. The resin to be purged (D) to be purged with the purging agent of the present invention may be any of EVOH, PVA, and PA. Such EVOH may be selected from the EVOH described in the hydrophilic thermoplastic resin (B). In use, EVOH with the same ethylene content and saponification degree should be used.
May be used, or different ones may be used. The same applies to PVA and PA.

It is preferable that the resin to be purged (D) and the hydrophilic thermoplastic resin (B) be of the same type in that purging can be performed in a short time. That is, if the resin to be purged (D) is EVOH, the hydrophilic thermoplastic resin (B) is also EV
If the OH and the resin to be purged (D) are PVA, the hydrophilic thermoplastic resin (B) is preferably PVA. If the resin to be purged (D) is PA, the hydrophilic thermoplastic resin (B) is also preferably PA. There is no particular limitation on the melt extruder in which the purging agent of the present invention is used, and a single-screw extruder or a twin-screw extruder is used, and a single-layer film extruder, a single-layer inflation extruder, an injection molding machine A multi-layer extruder, a multi-layer inflation extruder, a multi-layer blow molding machine, a co-extrusion injection molding machine and the like are also used.

With respect to the method of using the purging agent, the purging agent is usually charged after the resin to be purged (D) has disappeared from the extruder hopper. The charged amount is about 6 to 30 times the retained amount of the resin to be purged (D). At this time,
The screw rotation speed may be increased or the extrusion temperature may be changed. After the purging, the resin can be directly switched to the resin to be purged (D), or can be switched to another resin such as polyolefin, polystyrene, polyester, polyvinyl chloride, or polyvinylidene chloride. In addition, when the temperature of the extruder is stopped after the purging is completed, and then the extruder is restarted with the resin to be purged (D), the resin to be purged (D) is charged after the purging agent has disappeared from the hopper. At this time, the screw rotation speed may be increased or the extrusion temperature may be changed.
At the time of restarting, it is possible to switch to another resin such as polyolefin, polystyrene, polyester, polyvinyl chloride, polyvinylidene chloride and the like in addition to the original resin to be purged (D).

[0022]

EXAMPLES The method of the present invention will be specifically described below with reference to examples. In the following, “%” means on a weight basis unless otherwise specified. Example 1 As a hydrophobic thermoplastic resin (Α), a linear low-density polyethylene (Idemitsu polyethylene-L 0434, 190 ° C., 2
MI at 160 g = 4 g / 10 min), EVOH (ethylene content 32 mol%, saponification degree 99.6 mol% , 230 ° C., 2160 g ) as the hydrophilic thermoplastic resin (Β)
(MI = 3 g / 10 min ) is calculated as (Α) / (Β) = 90/10
(Weight ratio) blended, total amount of (Α) and (Β) 10
Glycerin (5 parts by weight) was mixed as a plasticizer (C) for EVOH with respect to 0 parts by weight. This mixture was subjected to a twin screw extruder (BT-30-S2-42-, manufactured by Plastics Engineering Laboratory).
L) and the supply part = 180 ° C., the compression part = 210 ° C.,
The purging agent of the present invention in the form of pellets was obtained by extruding at a measuring portion of 210 ° C.

The purging agent was evaluated in the following manner. A single screw extruder (L / D = 28) is used as the resin to be purged (D) using a single screw extruder (L / D = 28) and a die width of 100 mm.
Using a Brabender Plasticorder (PLE331) equipped with a fishtail die of
Extrusion was performed at 200 ° C., compression part = 230 ° C., measuring part = 230 ° C., die temperature = 230 ° C. for 30 minutes. Thereafter, the purging agent was allowed to flow under the same conditions for 30 minutes, and then the die was disassembled, and the adhesion state (I) of the resin to be purged to the metal surface in the die was visually observed. Separately, EVOH under the same conditions as above
After extruding for 30 minutes, the purging agent was
After flowing for 0 minutes, the extruder was stopped, restarted under the same conditions after half a day, switched from the purging agent to the resin to be purged, and 30 minutes after the restart as an evaluation of the film appearance of the resin to be purged. Collect the film of the time, 5 × 10
The number (II) of gels present in a cm-sized film was counted. Further, the state of attachment (III) of the purging agent to the fishtail die surface was visually observed.
The evaluation criteria are as follows.

[Situation of Resin Adhesion on Metal Surface in Die (I)] Very little adhesion of resin to be purged is observed. ○ −−− Although slight, adhesion of the resin to be purged is observed. × −−− A considerable amount of resin to be purged adhered. [Number of gels present in film (II)] ◎ --- 0 to 1 ○ --- 2 to 4 △ --- 5 to 9 × --- 10 or more [to the surface of fish tail die Resin adhesion (III)] ◎---Adhesion of purging agent is hardly observed. ○ −−− Although slight, adhesion of purging agent is observed. × −−− Considerable adhesion of purging agent is observed.

Example 2 In Example 1, the resin to be purged (D) was changed to an ethylene content of 29 mol%, a saponification degree of 99.6 mol% , and 230 ° C.
Evaluation was performed in the same manner except that the EVOH at 160 g was changed to MI = 3 g / 10 min . Example 3 The procedure of Example 1 was repeated, except that the amount of glycerin added was changed to 0.5 part by weight. Example 4 The procedure of Example 1 was repeated, except that the amount of glycerin added was changed to 20 parts by weight.

Example 5 The procedure of Example 1 was repeated except that 5 parts by weight of sorbitol was added instead of glycerin, and the same evaluation was performed. Example 6 In Example 1, a polymerization degree of 600 was used instead of glycerin.
Was performed in the same manner as in Example 1 except that 5 parts by weight of polyethylene glycol was added, and the same evaluation was performed. Example 7 In Example 1, the mixing weight ratio of (A) / (B) was changed to 70.
The evaluation was performed in the same manner as in Example 1 except that / 30 was set.

Example 8 In Example 5, the mixing weight ratio of (A) / (B) was changed to 50.
The evaluation was performed in the same manner as in Example 1 except that / 50 was set. Example 9 In Example 1, the mixing weight ratio of (A) / (B) was changed to 10
Except having set it to 0/0, it carried out similarly to Example 1 and evaluated similarly. Example 10 In Example 1, the hydrophobic thermoplastic resin (A) was replaced with low-density polyethylene (LF625H, 190 manufactured by Mitsubishi Chemical Corporation).
The same evaluation was performed in the same manner as in Example 1 except that MI was 6 g / 10 minutes at 2160 g).

Example 11 In Example 1, the hydrophilic thermoplastic resin (B) and the resin to be purged (D) were replaced by an oxyalkylene group-containing PVA-based resin (oxyalkylene group content: 25% by weight, PVA polymerization degree: 500, Degree of saponification: 95 mol% , 230 ° C, 2160 g
(MI = 3 g / 10 min. ) In the same manner as in Example 1, and similarly evaluated. Example 12 In Example 1, the plasticizer (C) was oxybenzoic acid ester, and the hydrophilic thermoplastic resin (B) and the resin to be purged (D) were nylon 6/66 copolymer (Mitsubishi Chemical Corporation).
And Novamid EN220), and the evaluation was performed in the same manner as in Example 1.

Comparative Example 1 In Example 1, the mixing weight ratio of (A) / (B) was 20
The evaluation was performed in the same manner as in Example 1 except that / 80 was set. Comparative Example 2 The procedure of Example 1 was repeated except that the hydrophobic thermoplastic resin (B) was not added, and the same evaluation was performed. Comparative Example 3 The procedure of Example 1 was repeated except that the amount of the plasticizer (C) was changed to 50 parts by weight.

Comparative Example 4 The procedure of Example 1 was repeated except that the plasticizer (C) was not added, and the same evaluation was performed. Comparative Example 5 The same evaluation as in Example 1 was performed using only low-density polyethylene (Idemitsu Polyethylene-L 0134, melt index at 190 ° C., 2160 g, 1 g / 10 min) as a purging agent, and evaluated in the same manner. . Table 1 shows the evaluation results of the examples and the comparative examples.

[0031]

[Table 1] Note) Evaluations (I) to (III) are evaluation items (I) in Example 1.
~ (III).

[0032]

The purging agent of the present invention contains a plasticizer for the resin to be purged, so that EVOH, PVA, PA
In a device that melt-molds a hydrophilic thermoplastic resin such as that described above, the residual resin adhered to the metal surface in the resin flow path can be quickly discharged, and even when EVOH, PVA, and PA are charged into the flow path again, There is no residual purging agent, and product loss can be greatly reduced.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B29K 23:00 29:00 (56) References JP-A-2-60727 (JP, A) JP-A-5-2955397 (JP, A) JP-A-5-42547 (JP, A) JP-A-3-182535 (JP, A) JP-A-5-124046 (JP, A) JP-A-1-167353 (JP, A) JP-A-7 -330974 (JP, A) Japanese Patent Publication No. 55-15501 (JP, B2) US Patent 5,424,012 (US, A) US Patent 5,443,768 (US, A) US Patent 5,139,694 (US, A) US Patent 3,119,720 (US, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 47/00-47/96 C08L 23/02 C08L 31/04 EPAT (QUESTEL)

Claims (6)

(57) [Claims] 1. A composition comprising a hydrophobic thermoplastic resin (A) and a hydrophilic thermoplastic resin (B), and a compounding weight ratio (A) /
(B) is 100/0 to 30/70 and (A + B) 1
The plasticizer (C) of the resin to be purged is added in an amount of 0. 00 parts by weight.
A purging agent comprising from 0.01 to 40 parts by weight. 2. The purging agent according to claim 1, wherein the hydrophobic thermoplastic resin (A) is a polyolefin resin. 3. The method according to claim 1, wherein the hydrophilic thermoplastic resin (B) is ethylene-
Saponified vinyl acetate copolymer, polyvinyl alcohol,
The purging agent according to claim 1, wherein the purging agent is at least one kind of a polyamide resin. 4. The plasticizer (C) of the resin to be purged includes alcohols, aromatic sulfonamides, long-chain fatty acid amides,
Any one of oxybenzoic acid esters, urea, and molasses
The purging agent according to any one of claims 1 to 3, wherein the purging agent is at least one species. 5. The purging agent according to claim 4, wherein the alcohol is a polyhydric alcohol or a sugar alcohol. 6. The resin according to claim 1, wherein the resin to be purged (D) is at least one of saponified ethylene-vinyl acetate copolymer, polyvinyl alcohol and polyamide resin. Purging agent.