JPH1016023A - Purging agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate the discharge of a residual resin which adheres to the metal surface in the resin channel of a melt molding machine by a method in which a purging agent is composed of a hydrophobic thermoplastic resin, a hydrophilic thermoplastic resin, and water and the mixing weight ratio is specified. SOLUTION: A purging agent is composed of a hydrophobic thermoplastic resin A, a hydrophilic thermoplastic resin B, and water C, its mixing weight ratio A/B is 99/1-30/70, and the agent contains 0.1-20 pts.wt. of C to 100 pts.wt. of (A+B). Linear low density polyethylene, low density polyethylene, and polypropylene are used preferably as the resin A, and the preferable melt indices (measured at 190 deg.C under a load of 2160g) of them are 0.1-80g/10min. The saponification product (EVOH) of an ethylene-vinyl acetate copolymer, a polyvinyl acetate type resin, a polyamide resin are preferable as the resin B. The ethylene content of EVOH is preferably 15-70% and the degree of saponification of EVOH is preferably 90% or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a saponified ethylene-vinyl acetate copolymer (hereinafter referred to as E) in an extruder.
VOH), polyvinyl alcohol-based resin (hereinafter abbreviated as PVA), polyamide-based resin (hereinafter abbreviated as P
A), and more specifically, when the resin remaining in the melt flow path is quickly extruded in an extruder, and when the resin is again introduced into the flow path, the purging agent The present invention relates to a purging agent in which product defects such as foreign matters and streaks due to residual products 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 agent consisting of resin,
Japanese Patent Application Laid-Open No. 62-117712 discloses a purging agent obtained by mixing water with a polyester resin having a high melt viscosity.
Japanese Patent No. 187410 discloses purging agents in which water is added to a mixture of a high-viscosity resin and a low-viscosity resin containing a foaming agent.

[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 of (1) has a problem that the viscosity at the time of heating is low (it becomes very low after heating for 300 minutes), which may cause an unpleasant odor and may cause the product to smell, which is not preferable. JP-A-62-171712 and JP-A-4-1874
The purging agent disclosed in Japanese Patent Publication No. 10 has a drawback that the purging agent is poorly discharged when the resin is switched from the purging agent due to a high melt viscosity.

[0007]

The inventor of the present invention has conducted intensive studies to solve the above problems, and as a result, has found that the hydrophobic thermoplastic resin (A), the hydrophilic thermoplastic resin (B) and the water (C) can be used. And its compounding weight ratio (A) / (B) is 9
A purging agent which is 9/1 to 30/70 and contains 0.1 to 20 parts by weight of (C) based on 100 parts by weight of (A + B) reduces the purging time and reduces product loss. The present inventors have found that the purging can be carried out more effectively, and the purging can be performed more effectively without fear of generation of off-flavor, thereby completing the present invention.

[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. 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, it exceeds 80 g / min. The performance of discharging the resin to be purged is undesirably reduced.

Further, as the hydrophilic thermoplastic resin (B), EVOH, PVA, PA and the like are used. E
VOH has an ethylene content of 15-70 mol%, preferably 2
0 to 60 mol%, the degree of saponification is 90% or more, preferably 95%
% Or more, and the ethylene content is 15 mol%.
If it is less than 70%, melt extrusion becomes difficult. On the contrary, if it exceeds 70 mol%, the ability to retain water (C) is undesirably reduced. 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-octene, α-dodecene,
Comonomers such as α-olefins such as α-octadecene, unsaturated carboxylic acids or salts thereof, partial alkyl esters, complete alkyl esters, nitriles, amides, anhydrides, unsaturated sulfonic acids or salts thereof may be included.

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.

Embedded image

However, R ₀ , R ₁ , R ₂ , and R ₃ represent hydrogen or an alkyl group.

Embedded image However, R ₀ , 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, 1
PVA containing additives such as -4-butanediol, glycerin, propylene glycol, polyethylene oxide, etc.), and the content is preferably 0.1 to 50% by weight, more preferably 0.2 to 50% by weight. ~ 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), laurin 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 weight ratio of the hydrophobic thermoplastic resin (A) to the hydrophilic thermoplastic resin (B) is as follows: hydrophobic thermoplastic resin (A) / hydrophilic thermoplastic resin (B) = 99/1 to 1. 30
/ 70, preferably 99/1 to 35/65, more preferably 99/1 to 40/60. (A) /
When (B) exceeds 30/70, the mixed resin composition adheres to the inside of the resin flow path, which is not preferable. In the present invention, the most characteristic feature is that the hydrophobic thermoplastic resin (A) and the hydrophilic thermoplastic resin (B) further contain water (C). The content is 0.1 to 20 parts by weight, preferably 0.2 to 18 parts by weight, more preferably 0.3 to 15 parts by weight based on 100 parts by weight of the total of (A) and (B). The content of (C) is 0.
If the amount is less than 1 part by weight, there is no effect of discharging the resin to be purged adhering in the resin flow path, and it is not practical. Unsuitable because the purge resin cannot be discharged.

As a method of containing the water (C), a method of directly containing water or steam in the above (A) and (B), and a method of adding a metal hydroxide to the above (A) and (B)
And a method of generating moisture by the heat of the mixture. In carrying out the method, (A)-
The order of blending (mixing) each component (C) is not particularly limited, and it can be arbitrarily performed. The above-mentioned components (A) to (C) can be melt-molded to form the purging agent of the present invention. However, since it is difficult to control the content of water (C), it is particularly preferable to use a mixture of a hydrated hydrophilic thermoplastic resin (B) and a hydrophobic thermoplastic resin (A). The hydrophilic thermoplastic resin (B) at 0 to 90 ° C
A method of immersing in about 0.1 to 10 hours of cold water or hot water so as to have the water content of the present invention, and then mixing with the hydrophobic thermoplastic resin (A), the hydrophilic thermoplastic resin (B) A method of adjusting the water content in the drying step at the time of the production of and then mixing with the hydrophobic thermoplastic resin (A). The blending of the hydrated hydrophilic thermoplastic resin (B) and the hydrophobic thermoplastic resin (A) is performed by a known stirrer such as a tumbler, a Henschel mixer, and a ribbon blender.

In carrying out one of the methods, metal hydroxide is added to (A) and / or (B) or a mixture of (A) and (B) in an amount of 150 to 150 so that the water content is as described above. It can be carried out by melting and mixing at 250 ° C. The mixing amount of such a metal hydroxide cannot be unconditionally determined depending on the kind, but usually, about 1 to 60 parts by weight per 100 parts by weight of (A + B). There are Al (OH) ₃ and Mg (OH) ₂ as such metal hydroxides. Further, in the present invention, the purging agent once used for purging can be readjusted to the above-mentioned mixing ratio of (A) to (C) and reused. Further, (A) and (B)
It is also possible to adjust the compounding ratio of (A) and (B), the content of (C), and the like by using scraps of a molded product of the resin composition made of the resin composition of the present invention to obtain the purging agent of the present invention.

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,
A plasticizer and the like can be added as long as the effects of the present invention are not impaired. 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). Depending on the type of EVOH used, EVOH having the same ethylene content and saponification degree may be used, or different EVOHs 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) are 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).

[0021]

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 the hydrophilic thermoplastic resin (B), EVOH (ethylene content: 32 mol%, saponification degree: 99.6 mol%, 210
The resulting EVOH was immersed in hot water at 90 ° C. for 5 hours to obtain an EVOH having a water content of about 20%. Next, as the above-mentioned water-containing EVOH and the hydrophobic thermoplastic resin (A), linear low-density polyethylene (Idemitsu polyethylene-L 043
(MI at 4N, 190 ° C., 2160 g = 4 g / 10 min)
Was dry-blended so that (A) / (B) = 75/25 (weight ratio), and the purging agent of the present invention [(A + B)
The content of water (C) is 6 parts by weight with respect to 100 parts by weight].

The purging agent was evaluated in the following manner. EV colored black as resin to be purged (D)
OH (same as above) was supplied using a single screw extruder (L / D = 28) and a plastic coder (PLE331) manufactured by Brabender Co. equipped with a fishtail die having a die width of 100 mm. = 230 ° C, measuring section =
Extruded at 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, after extruding EVOH for 30 minutes under the same conditions as described above, the purging agent was allowed to flow under the same conditions for 30 minutes, then the extruder was stopped, and after half a day, restarted under the same conditions, from the purging agent to the resin to be purged. The film was sampled 30 minutes after restarting as an evaluation of the film appearance of the resin to be purged, and the number of gels (II) present in the film having a size of 5 × 10 cm 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)] −---Almost no adhesion of resin to be purged. ○ −−− 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 fishtail die surface Resin adhesion status (II
I)] −---Almost no adhesion of purging agent is observed. ○ −−− Although slight, adhesion of purging agent is observed. × −−− Considerable adhesion of purging agent is observed.

Example 2 In Example 1, dry blending was performed so that (A) / (B) = 90/10 (weight ratio) [(A + B) 10
Water (C) content relative to 0 parts by weight: 2.5 parts by weight].

Example 3 In Example 1, the resin to be purged (D) was prepared by adding ethylene content of 44 mol%, saponification degree of 99.6 mol%, 210 ° C. and 2
The same evaluation was performed except that the EVOH at 160 g was changed to MI = 12 g / 10 min.

Example 4 The procedure of Example 1 was repeated except that the water content of EVOH was 25% [the content of water (C) was 8 parts by weight per 100 parts by weight of (A + B)]. Was similarly evaluated.

Example 5 In Example 1, the hydrophilic thermoplastic resin (B) and the resin to be purged (D) were replaced with a nylon 6/66 copolymer (Mitsubishi Chemical Corporation).
Except for changing to Novamid EN220 (manufactured by K.K.), evaluation was performed in the same manner as in Example 1, and similarly.

Example 6 In Example 1, the hydrophobic thermoplastic resin (A) was replaced by 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 7 In Example 1, the hydrophilic thermoplastic resin (B) and the resin to be purged (D) were replaced with an oxyalkylene group-containing PVA resin (oxyalkylene group content: 25% by weight, PVA polymerization degree: 500, Degree of saponification: 95 mol%, 210 ° C, 2160 g
MI = 3 g / 10 min.) And immersed in cold water at about 10 ° C. for 1 hour to prepare a water-containing pellet, and evaluated in the same manner as in Example 1.

Example 8 EVOH (ethylene content 32 mol%, degree of saponification 99.6 mol%, 210 ° C.) was used as a hydrophilic thermoplastic resin (B).
MI at 2160 g = 3 g / 10 minutes)
In the drying step in the production of VOH, a water-containing EVOH obtained by setting the water content of EVOH to 20% was used [(A +
B) The content of water (C) per 100 parts by weight was 6 parts by weight], and the same evaluation was performed as in Example 1.

Example 9 Using the linear low-density polyethylene and EVOH of Example 1, 90 parts by weight of linear low-density polyethylene, EVOH
10 parts by weight and 16 parts by weight of Al (OH) ₃ were melt-mixed at 200 ° C. to obtain a purging agent having a water content of 4.7%.
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 (A) was not added, and the same evaluation was performed.

Comparative Example 3 The procedure of Example 1 was repeated, except that the water content of EVOH was 55% (the content of water (C) was 30 parts by weight per 100 parts by weight of (A + B)). Was similarly evaluated.

Comparative Example 4 Example 1 was repeated except that water (C) was not added (EVOH was dried by heating to reduce the water content to less than 0.1%). Was evaluated.

Comparative Example 5 The same procedure as in Example 1 was carried out except that only low-density polyethylene (Idemitsu Polyethylene-L 0134, melt index at 190 ° C., 2160 g, melt index = 1 g / 10 min) was used as a purging agent. Was evaluated. Table 1 shows the evaluation results of the examples and the comparative examples.

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

[0037]

The purging agent of the present invention comprises a hydrophobic thermoplastic resin (A), a hydrophilic thermoplastic resin (B) and water (C).
Is mixed in a specific amount, so that in a device for melt-molding a hydrophilic thermoplastic resin such as EVOH, PVA, or PA, the residual resin adhered to the metal surface in the resin flow path can be quickly discharged, and furthermore, EVOH, Even when PVA and PA are introduced into the flow channel again, no purging agent remains and product loss can be greatly reduced.

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[Procedure amendment]

[Submission date] September 11, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

Example 5 In Example 1, the hydrophilic thermoplastic resin (B) and the resin to be purged (D) were replaced with a nylon 6/66 copolymer (Mitsubishi Chemical Corporation).
Ltd., was changed to Novamid EN220) is performed in the same manner as in Example 1, water content of 10% nylon trees
A fat was obtained. Evaluation was performed in the same manner.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location C08L 77/00 LQS C08L 77/00 LQS 101/00 LSY 101/00 LSY

Claims (5)

[Claims] 1. A composition comprising a hydrophobic thermoplastic resin (A), a hydrophilic thermoplastic resin (B) and water (C), and the compounding weight ratio (A) / (B) is from 99/1 to 30/70. And (A
+ B) A purging agent comprising 0.1 to 20 parts by weight of (C) based on 100 parts by weight. 2. The purging agent according to claim 1, wherein the purging agent is a blend of a hydrophilic thermoplastic resin (B) and a hydrophobic thermoplastic resin (A) containing water (C). 3. The purging agent according to claim 1, wherein the hydrophobic thermoplastic resin (A) is a polyolefin resin. 4. 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 any one of claims 1 to 3, wherein the purging agent is at least one kind of a polyamide resin. 5. The resin to be purged (D) is a saponified ethylene-vinyl acetate copolymer, a polyvinyl alcohol resin,
The purging agent according to any one of claims 1 to 4, wherein the purging agent is at least one kind of a polyamide resin.