JP2805188B2 - High purity chemical container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container used for storing high-purity chemicals.

[0002]

2. Description of the Related Art Generally, glass containers and plastic containers are used as containers for storing chemicals and the like.

In the field of semiconductors, it is necessary that stored high purity chemicals can be stored with high purity. Many chemicals are deteriorated by loss due to the permeation of the content liquid through the container or by invasion of external gas, or deteriorate when exposed to light for a long time. For this reason, it is preferable that the container for storing the medicine has a barrier property and a light-shielding property in order to prevent the deterioration and keep the quality constant from the production of the medicine until consumption.

[0004] As such a container, a colored glass container is widely used. By selecting the material of the colored glass container, there is a feature that the leaching of the impure fine particles into the medicine from the container is small. However, since the container itself is heavy, handling is inconvenient and the container may be broken due to dropping or the like.

On the other hand, Japanese Patent Publication No. 60-14695 discloses a molded container comprising a mixture of a polyolefin, a polymer incompatible with the polyolefin, and a polyolefin having a carboxyl group and having high barrier properties and high mechanical strength. I have.

However, high-purity solvent-based resists and diluting solvents used for semiconductor processes, liquid crystal displays, etc., such as methyl alcohol, ethyl alcohol, isopropyl alcohol, isobutyl alcohol, etc.
Ethylene glycol, acetone, ethyl acetate, toluene, dimethylformamide, ethylene glycol acetate, methoxypropyl acetate, butyl cellosolve and the like, and high-purity chemicals used for medicines such as sterilization, disinfection, raw materials for preparations, such as methyl alcohol, ethyl alcohol , Isopropyl alcohol, etc., during storage and storage, impure fine particles leach into the stored chemicals from the resin composition or additives forming the container, or the chemicals are deteriorated by light to deteriorate the purity. . For this reason, there are problems that the quality and yield of semiconductors and liquid crystals are significantly adversely affected, and the storage period of chemicals is shortened.

[0007] In addition, while the chemical is stored in the container for a long period of time, the cleanness is an index indicating the degree of impurity particles leaching out of the resin composition forming the container into the chemical and impure the chemical. There is something. The degree of cleanliness is determined by forming a test container, storing ultrapure water in the test container for a certain period of time, and determining the number of fine particles with a particle size of 0.2 μm or more in 1 ml of water stored in the resin container. Calculate and calculate. Specifically, it is defined by the following equation.

[0008]

(Equation 1)

In the equation (1), a is the capacity of the container to be inspected, b
Is the amount of ultrapure water sampled from the container to be inspected. Sampling water is collected as follows. Into a container to be inspected having a capacity of aml, half the volume, a / 2 (ml) of ultrapure water is added, and each time, the container is shaken for 15 seconds and discharged to wash the inside of the container. After repeating the shaking washing 5 times, a / 2 ml of the ultrapure water is put again in the a (ml) container, left at room temperature for one week, shaken for further 15 seconds, and then in the shaken container. Let the water stand for 20 minutes. Sampling water is collected from the water that has been allowed to stand for 20 minutes. c is a value obtained by counting fine particles having a particle diameter of 0.2 μm or more contained in the whole amount of the sampling water by a particle counter. The cleanliness is calculated by the equation (1) based on the numerical value. When the cleanness is less than 500 / ml, the quality and yield of semiconductors and liquid crystals can be improved.

A container for storing high-purity chemicals cannot be used unless the container has a low degree of cleanness and has a light-shielding property and a barrier property. A container formed by adding a barrier composition to a conventional polyethylene resin had a high degree of cleanliness and was inferior in light-shielding properties. Further, a container molded by adding a light-shielding pigment and a pigment dispersant had a very high value of cleanliness, and could not be used as a container for high-purity chemicals.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has excellent mechanical strength, is easy to handle, and prevents leaching of impure fine particles into stored chemicals. It is an object of the present invention to provide a highly pure chemical container having extremely low barrier properties and light shielding properties.

[0012]

Means for Solving the Problems As a result of intensive studies in view of the above-mentioned object, when producing a high-purity chemical container, the weight-average molecular weight of the raw material resin is within a certain range, and the light-shielding pigment in the resin composition and The content of the barrier composition is within a certain range, and the content of the low molecular weight polymer, the pigment dispersant and the additives in the resin composition is less than a certain weight, so that the mechanical strength is excellent and the filling is excellent. The present inventors have found that a container for high-purity chemicals having a barrier property and a light-shielding property with extremely little leaching of fine particle impurities into the chemical can be obtained, and reached the present invention.

That is, the high-purity chemical container of the present invention comprises:
A container for high-purity chemicals comprising a resin composition in which a light-shielding pigment, a pigment dispersant, and a barrier composition are added to a polyethylene or ethylene / α-olefin copolymer resin having a density of 0.940 to 0.970 g / cm ^3. The resin has a weight average molecular weight of 12 to 26 × 10 ⁴ as measured by gel permeation chromatography (GPC), and a molecular weight of 1
The polymer of less than × 10 ^{3 is} less than 5% by weight of the resin, and each content of the neutralizing agent, antioxidant and light stabilizer in the resin composition is determined by liquid chromatography. 0.1% by weight or less.

The α-olefin copolymerized with ethylene is
Propylene, butene-1, 4-methyl-pentene-1,
Hexene-1 and octene-1 are used. The content of α-olefin in the copolymer is preferably 15% by weight or less.
The molecular structure of the copolymer may be any of atactic, isotactic and syndiotactic. The polymerization method may be a low pressure method or a medium pressure method.

The light-shielding pigments include titanium oxide, carbon black, red iron oxide inorganic pigments, phthalocyanine-based, quinacridone-based, and azo-based organic pigments. The content of the light-shielding pigment is preferably from 0.01 to 5% by weight based on the resin composition. If the content of the light-shielding pigment is less than 0.01% by weight based on the resin composition, a sufficient light-shielding effect cannot be obtained. If the content exceeds 5% by weight, the cleanness exceeds 500 particles / ml, and the container for high-purity chemicals is used. Not suitable.

Examples of the pigment dispersant include olefin polymers such as polyethylene and polypropylene. The number average molecular weight of the pigment dispersant added to obtain a high degree of dispersion of the pigment is 2 × 10 ³ or more, and the content of the pigment dispersant is less than 5% by weight based on the resin composition. Is preferred.
The number average molecular weight of the pigment dispersant measured by GPC is 2
Less than × 10 ³ or 5% by weight pigment dispersant
If it exceeds, the cleanliness exceeds 500 pcs / ml, which is not suitable for containers for high-purity chemicals.

The barrier composition, polyamides, polyvinyl alcohol, poly mixture of polyolefins having at least one carboxyl group selected from among (ethylene - - co-vinyl alcohol), For example a commercially available sealer RB series (DuPont Company). The content of the barrier composition is 4% by weight based on the resin composition.
Preferably it is about 25% by weight. If the content of the barrier composition is less than 4% by weight with respect to the resin composition, sufficient barrier properties cannot be obtained.
Exceeds 500 / ml and is not suitable for high purity chemical containers.

The neutralizing agent is not necessary when the polymerization method is a medium pressure method, and is used as a chlorine catcher when the polymerization method is a low pressure method. Examples of the neutralizing agent include stearates of alkaline earth metals such as calcium, magnesium and barium, and these need to be minimized by an operation such as increasing the activity of the catalyst in the polymerization step. If the content of the neutralizing agent exceeds 0.1% by weight of the resin composition, the cleanliness exceeds 500 particles / ml and the quality and yield of semiconductors and liquid crystals are deteriorated. Against things
It must be less than 0.1% by weight.

Antioxidants include dibutylhydroxytoluene, pentaerythyl-tetrakis [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di- t-butyl-
A phenolic antioxidant of 4-hydroxyphenyl) propionate is mentioned. For the same reason as the neutralizing agent, the content of the antioxidant needs to be 0.1% by weight or less based on the resin composition.

As the light stabilizer, 2- (5-methyl-
2-hydroxyphenyl) benzotriazole, 2-
Benzotriazole-based light stabilizer of (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, bis (2,2,6,6-tetramethyl-4-piperidine) sebacate, poly [｛6- (1,
1,3,3-tetramethylbutyl) amino-1,3,5
-Triazine-2,4-diyl} (2,2,6,6-
Tetramethyl-4-piperidyl) imino {hexamethylene} (2,2,6,6-tetramethyl-4-piperidyl) imino}] hindered amine light stabilizers, for the same reasons as the neutralizing agents. It is necessary that the content of the light stabilizer be 0.1% by weight or less based on the resin composition.

As an additive, a catalyst is appropriately used in a predetermined amount at the time of polymerization, and a neutralizing agent, an antioxidant, a light-fast stabilizer,
The light-shielding pigment and the pigment dispersant are eluted from the container into the chemical and cause impurity fine particles, so the amount of addition is important.

The content of the additives contained in the resin composition is as follows:
Using tetrahydrofuran (THF) for the resin composition,
It is a value obtained by separating and quantifying an extract extracted by a Soxhlet extractor for 8 hours by liquid chromatography. The measurement conditions were as follows: the apparatus was GULLIVER (manufactured by JASCO Corporation), the column was Finepak GEL 101 (manufactured by JASCO Corporation), the solvent was THF, and the detector was UV-97.
0 (manufactured by JASCO Corporation) and 830-RI (manufactured by JASCO Corporation).

The container for a high-purity chemical of the present invention is produced, for example, by the following method. A resin composition obtained by adding a light-shielding pigment, a pigment dispersant and a barrier composition to polyethylene or an ethylene / α-olefin copolymer having a density of 0.940 to 0.970 g / cm ³ is melt-extruded. At this time, the additives contained in the resin composition, that is, the content of the neutralizing agent, the antioxidant and the light stabilizer are each 0.1% with respect to the resin composition.
Weight percent or less. The addition amount of the light-shielding pigment is 0.01 to 5% by weight based on the resin composition, the number average molecular weight of the pigment dispersant composed of an olefin polymer is 2 × 10 ³ or more, and the content is in the resin composition. Less than 5% by weight, and the amount of the barrier composition added is from 4% by weight to 25% by weight of the resin composition.
% By weight.

The method of mixing the light-shielding pigment, the pigment dispersant, the barrier composition, and the additives with the resin is not particularly limited.
For example, a method of adding directly after polymerization of the pelletizing process, to create a pre <br/> Me high concentration master batch, straight them during molding
Dry blending method and combination of said methods
And mixing .

When a masterbatch of the composition to be mixed is prepared, the base resin has a weight average molecular weight of 12 to 26 × 10 ⁴ , as in the case of the raw resin, and a polymer having a molecular weight of 1 × 10 ³ or less is used as the base resin. It is necessary to use less than% by weight. Particularly, when a light-shielding pigment is blended, a master batch is often used because not only the light-shielding performance but also the appearance and design can be easily changed. Examples of the master batch production apparatus include a Banbury mixer, a mixing roll, and other special mixers, and the Banbury mixer is most frequently used.

In the case of a material having relatively good dispersibility, such as carbon black or titanium oxide , a twin-screw kneader or a single-screw extruder may be used.
The base resin and light-shielding pigment, pigment dispersant
A master batch can be obtained by blending the rear composition . In addition, also at the time of preparation of a master batch, additives can be added in a range where the additive content of the neutralizing agent, antioxidant and light stabilizer does not exceed 0.1% by weight of the resin composition.

The extruder used for the melt extrusion molding may be an ordinary single screw extruder, and the screw may be any as long as it gives an appropriate shearing force. However, screens and breaker plates are not used. The resin composition is melted by an extruder and extruded into a cylindrical parison. The extruded parison is sandwiched by a mold, and a pressurized gas is blown from a blow pin, cooled, and molded.

In the obtained container, the weight average molecular weight of the container measured by GPC was 12 to 26 × 10 ⁴ , and the molecular weight was 1
It is important that anything less than × 10 ³ be controlled to less than 5% by weight of the resin.

The method for measuring the molecular weight of the container is to dissolve the resin composition cut from the container in a solvent (ortho-dichlorobenzene) to prepare a sample solution, and measure the molecular weight and the molecular weight distribution by GPC. The molecular weight of the pigment dispersant is measured similarly.
The weight average molecular weight and the number average molecular weight are calculated by the following equations. Weight average molecular weight = Σ (M × w) / Σw (2) Number average molecular weight = Σw / Σ (w / M) (3) where M is the molecular weight and w is the weight fraction.

The GPC measurement conditions were as follows:
V (Waters), column is TSKgel GM
H-HT (manufactured by Tosoh Corporation), the solvent was ortho-dichlorobenzene, the temperature was 138 ° C, and the detector was a differential refractometer. In order to control the molecular weight distribution of the container within the above range,
The starting resin must also have a certain range of molecular weight distribution.

When the weight average molecular weight of the raw material resin is less than 12 × 10 ⁴ , it is generally difficult to make a polymer having a molecular weight of 1 × 10 ³ or less to less than 5% by weight of the resin. Even if a resin is obtained by devising a polymerization method, it becomes a resin with a very narrow molecular weight distribution or a resin with a molecular weight distribution deviated to the high molecular weight side. To mold this resin, raise the molding temperature or increase the shear stress. And the moldability is very poor.

When the weight average molecular weight of the raw material resin exceeds 26 × 10 ⁴ , the resin has a high melt viscosity, so that molecular breakage due to shear stress is unavoidable, and a polymer having a molecular weight of 1 × 10 ³ or less is added to the resin by 5% by weight. %.

The raw material resin has a weight average molecular weight of 12 to 26 × 10 ⁴
Even in the case of a resin in which the polymer having a molecular weight of 1 × 10 ³ or less is 5% by weight or more of the resin in order to improve the moldability, the polymer having a molecular weight of 1 × 10 ³ or less in the molded container is used as the resin. 5% by weight
It cannot be suppressed below, and the same applies to molding methods that give excessive shear stress.

As described above, when the polymer having a molecular weight of 1 × 10 ³ or less accounts for 5% by weight or more of the container, impure fine particles leach into the drug, and the cleanness becomes 500 particles / ml or more. Cannot be used. As the molding method, besides the above-mentioned blow molding, inflation molding , extrusion molding and the like can be mentioned.

[0035]

The container for high-purity chemicals of the present invention is obtained by dry blending a resin of polyethylene or ethylene / α-olefin copolymer with a light-shielding pigment, a pigment dispersant and a barrier composition under appropriate conditions. It can be molded by a usual single-screw extruder equipped with a screw giving a high shearing force. Therefore, a high-purity chemical container having a barrier property and a light-shielding property can be obtained at low cost.

[0036]

Embodiments of the present invention will be described below in detail. Example 1 A polymer having a density of 0.956 g / cm ³ , a weight average molecular weight of 15.0 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less, containing 1.54% by weight, comprising a polymer obtained by a low pressure method, a neutralizing agent and an antioxidant And 100 parts by weight of polyethylene pellets containing no light stabilizer, 15.1% by weight of the same polyethylene resin as the raw material resin as a base resin, 3.5% by weight of titanium oxide and 0.3% by weight of carbon black as a light-shielding pigment, and a pigment dispersant Polyethylene 1.7 having a density of 0.95 g / cm ³ and a number average molecular weight of 3 × 10 ³
% By weight, and 63.5% by weight of a nylon 6/66 copolymer resin and 15.9% by weight of maleic anhydride-modified polyethylene as a barrier composition, and 17 parts by weight of a masterbatch prepared by a single screw extruder were dry-blended, 50m / m,
It was melted at 230 ° C. in an extruder with L / D = 22 (D: screw diameter, L: effective screw length) and extruded into a cylindrical parison. The extruded parison was sandwiched between molds, and compressed air of 6 kg / cm ² was blown from a blow pin, and cooled with a mold cooled to 20 ° C. to form a round container having a capacity of 1000 ml and a weight of 100 g. The weight average molecular weight of the molded container resin composition is
The polymer having a molecular weight of 14.8 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less was 1.58% by weight of the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

Next, the cleanness of the molded container was measured. Ultra-pure water (trade name: Trepure LV-10T)
(Made by Toray Industries, Inc.)), 500 ml was shaken, washed for 15 seconds, and drained. This shaking and washing was repeated 5 times. 5 ml was collected from the fifth washing water, and the number of fine particles of 0.2 μm or more leached in the water was counted using a particle counter (type: KL).
-22 (manufactured by Rion Corporation)). The number of fine particles in water (particles / ml) was calculated by the following equation (4) similar to the equation (1). Table 2 shows the results.

[0038]

(Equation 2)

Put 500 ml of ultrapure water in a molding container
The mixture was shaken for 2 seconds and left at room temperature for one week. Shake again for 15 seconds, leaving the water that has passed one week,
Let stand for 20 minutes. 5 ml was collected from the water left standing for 20 minutes, and the number of fine particles in the water (particles / ml) was calculated in the same manner as above. Table 2 shows the results. One week later, the number of fine particles in the water was 200 particles / ml or less, which proved to be extremely clean.

[0040]

[Table 1]

[0041]

[Table 2]

Next, the body 1 × 4 cm square, thickness of this container
Cut out 1.36 mm and use a spectrophotometer (Type: Ubest-
55 (manufactured by JASCO Corporation)), and the absorbance at a wavelength of 600 to 200 nm was measured. The absorbance at 400 nm is 7.0 (transmittance 10 ^-5
%) And extremely good light-shielding properties.

Example 2 A polymer having a density of 0.951 g / cm ³ , a weight-average molecular weight of 15.2 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less, containing 1.37% by weight, was composed of a polymer obtained by a medium pressure method. Example 1 was added to 100 parts by weight of polyethylene pellets containing 0.02% by weight.
17 parts by weight of the same master batch dry-blended,
Melted to 230 ° C. in the same extruder as in Example 1,
A 0 ml, 100 g round container was molded. The weight average molecular weight of the molded container resin composition is 15.0 × 10 ⁴ and the molecular weight is 1 × 10
The polymer of ³ or less was 1.40% by weight of the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. One week later, the number of fine particles in the water was 200 particles / ml or less, which proved to be extremely clean.

Next, the body of this container is 1 × 4 cm square, and the thickness is
Cut out 1.36mm, wavelength 600-200 in the same manner as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 7.0 (transmittance
10 ^-5 %), which is an extremely good light-shielding property.

Example 3 100 parts by weight of the same polyethylene pellets as in Example 1
3.57% by weight of titanium oxide as a light-shielding pigment in a base resin made of a polymer obtained by a medium pressure method, containing 1.55% by weight of a material having a density of 0.955 g / cm ³ , a weight average molecular weight of 15.2 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less. % And 0.3% by weight of carbon black and 63.5% of nylon 6/66 copolymer resin as a barrier composition.
% By weight and 15.9% by weight of maleic anhydride-modified polyethylene, and 17 parts by weight of a masterbatch prepared by a single screw extruder was dry-blended and melted at 230 ° C. in the same extruder as in Example 1. A round container having a capacity of 1000 ml and a weight of 100 g was formed. The weight average molecular weight of the molded container resin composition was 14.7 × 10 ⁴ , and the polymer having a molecular weight of 1 × 10 ³ or less was 1.62% by weight of the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. One week later, the number of fine particles in the water was 300 particles / ml or less, which proved to be extremely clean.

Next, the body of the container is 1 × 4 cm square, and the thickness is
Cut off 1.31 mm, wavelength 600-200 as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 7.0 (transmittance
10 ^-5 %), which is an extremely good light-shielding property.

Example 4 A polymer having a density of 0.957 g / cm ³ , a weight average molecular weight of 20.7 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less, comprising 1.43% by weight, comprising a polymer obtained by a low pressure method, comprising a neutralizing agent, 17 parts by weight of the same master batch as in Example 1 was dry-blended with 100 parts by weight of polyethylene pellets containing no antioxidant and light stabilizer, and melted at 235 ° C. in the same extruder as in Example 1, A round container having a capacity of 1000 ml and a weight of 100 g was formed. The weight average molecular weight of the molded container resin composition is 20.5 × 10 ⁴ and the molecular weight is 1
× 10 ³ or less of the polymer was 1.44% by weight of the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. One week later, the number of fine particles in the water was 200 particles / ml or less, which proved to be extremely clean.

Next, the body of this container is 1 × 4 cm square, and the thickness is
Cut out 1.41 mm, wavelength 600-200 in the same manner as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 7.0 (transmittance
10 ^-5 %), which is an extremely good light-shielding property.

Comparative Example 1 A polymer having a density of 0.951 g / cm ³ , a weight-average molecular weight of 15.2 × 10 ⁴ and a molecular weight of 1 × 10 ³ or less, containing 1.37% by weight, comprising a polymer obtained by a medium pressure method, The polyethylene pellet containing no antioxidant and light stabilizer was melted at 178 ° C. in the same extruder as in Example 1 to form a round container having a capacity of 1000 ml and a weight of 100 g. The weight average molecular weight of the molded container resin composition was 15.1 × 10 ⁴ , and the polymer having a molecular weight of 1 × 10 ³ or less was 1.38% by weight of the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. One week later, the number of fine particles in the water was 200 particles / ml or less, which proved to be extremely clean.

Next, the body of this container is 1 × 4 cm square, and the thickness is
Cut 1.33 mm, wavelength 600-200 in the same manner as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 2.0 (transmittance
10 ^0%), it did not show sufficient light-shielding property.

Comparative Example 2 100 parts by weight of the same polyethylene pellets as in Example 1
In the master batch of Example 1, the pigment dispersant was
17 parts by weight of a master batch made of polyethylene having 0.92 g / cm ³ and a number-average molecular weight of 1 × 10 ³ was dry-blended.
The mixture was melted at 230 ° C. in the same extruder to form a round container having a capacity of 1000 ml and a weight of 100 g. The weight average molecular weight of the molded container resin composition was 14.8 × 10 ⁴ , and the polymer having a molecular weight of 1 × 10 ³ or less was 2.55% by weight based on the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. The number of fine particles in water after 1 week is 10,000 / ml
From the above, it was found that a large amount of fine particles had leached out.

Next, the body of this container is 1 × 4 cm square, and the thickness is
Cut off 1.41mm, wavelength 600-200nm as in Example 1
Was measured for absorbance. The absorbance at 400 nm is 7.0 (transmittance 10
^-5 %).

Comparative Example 3 100 parts by weight of the same polyethylene pellets as in Example 1
7.1% by weight of titanium oxide and 0.6% by weight of carbon black as a light-shielding pigment, and a density of 0.93 g / cm as a pigment dispersant
³ , 34.8% by weight of polyethylene having a number average molecular weight of 2.8 × 10 ⁴
And 46.0% by weight of a nylon 6/66 copolymer resin and maleic anhydride-modified polyethylene 1 as a barrier composition.
1.5 wt%, and 23.5 parts by weight of a master batch prepared by a single screw extruder was dry-blended and melted at 230 ° C. in the same extruder as in Example 1 to obtain a capacity of 1,000 ml and a weight of 1
A round container of 00 g was molded. The weight average molecular weight of the molded container resin composition was 14.7 × 10 ⁴ , and the polymer having a molecular weight of 1 × 10 ³ or less was 2.47% by weight based on the resin composition. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. The number of fine particles in water after 1 week is 10,000 / ml
From the above, it was found that a large amount of fine particles had leached out.

Next, the body 1 × 4 cm square, thickness of this container
Cut out 1.44 mm, wavelength 600-200 in the same manner as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 7.0 (transmittance
10 ^-5 %), which is an extremely good light-shielding property.

Comparative Example 4 100 parts by weight of the same polyethylene pellets as in Example 1
In the masterbatch of Example 1, 17 parts by weight of a masterbatch containing 0.04% by weight of zinc stearate and 0.08% by weight of polyoxyethylene fatty acid amide as the pigment dispersant was dry-blended, and the mixture was extruded in the same extruder as in Example 1. 230 ℃
Into a round container having a capacity of 1000 ml and a weight of 100 g. The weight average molecular weight of the molded container resin composition is 14.9 ×
In 10 ⁴ , a polymer having a molecular weight of 1 × 10 ³ or less is 1.55 of the resin composition.
% By weight. Table 1 shows the characteristics of the container resin composition and the conditions of the amount added, and Table 2 shows the configuration of the master batch.

The cleanliness of the molded container immediately after washing five times and one week later was measured in the same manner as in Example 1, and the results are shown in Table 2. The number of fine particles in water after 1 week is 10,000 / ml
From the above, it was found that a large amount of fine particles had leached out.

Next, the body of this container is 1 × 4 cm square, and the thickness is
Cut out 1.27 mm, wavelength 600-200 in the same manner as in Example 1.
The absorbance at nm was measured. Absorbance at 400 nm is 7.0 (transmittance
10 ^-5 %), which is an extremely good light-shielding property.

[0064]

As described in detail above, the container for high-purity chemicals of the present invention has excellent mechanical strength and is easy to handle, and leaching of impure fine particles into stored chemicals is extremely small. Moreover, it is possible to prevent the intrusion of external gas and the passage of the internal solution through the container, thereby preventing the content liquid from being altered by light or the intrusion of external gas. Therefore, it can be widely used as a chemical container for semiconductor chemicals and pharmaceuticals.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI C08L 23/08 B65D 1/00 A // (C08L 23/06 77:00 29:04) (56) References JP-A Sho 54 JP-A-48844 (JP, A) JP-A-6-220263 (JP, A) JP-A-62-39444 (JP, A) JP-A-62-209149 (JP, A) JP-A-62-178342 (JP, A) JP-A-1-208115 (JP, A) JP-A-56-57633 (JP, A) JP-A-59-68239 (JP, A) JP-A-60-233136 (JP, A) 273378 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C08L 23/06 B65D 1/09 B65D 85/84 C08K 3/00 C08K 5/00 C08L 23/08

Claims (5)

(57) [Claims] The resin of claim 1] polyethylene having a density of 0.940 to 0.970 g / cm ³ or ethylene · alpha-olefin copolymer, at least the light-shielding pigment 0.01 wt% to 5 wt% and the liquid or
A high purity chemical container comprising a resin composition to which 4% to 25% by weight of the gas barrier resin is added, wherein the resin has a weight average molecular weight of 12 as measured by gel permeation chromatography. ~ 26 × 10 ^4, less than 5 wt% of the weight-average molecular weight 1 × 10 ³ or less of the polymer the resin, the α- olefin is propylene, butene-1,4-methyl - pentene-1, hexene-1, A container for high-purity chemicals, which is at least one selected from octene-1. Wherein said light-shielding pigment is titanium dioxide, carbon black, and red iron oxide inorganic pigments, phthalocyanine pigments, quinacridone pigments, and claims, characterized in that it consists of at least one selected from organic pigments of azo Item 4. The container for high-purity chemicals according to Item 1. 3. A pigment dispersant of at least one olefin polymer, wherein the light-shielding pigment is selected from polyethylene and polypropylene having a number average molecular weight of 2 × 10 ³ or more.
And the pigment dispersant is 5% by weight of the resin composition.
The high purity chemical container according to claim 1, wherein 4. The method according to claim 1, wherein the liquid or gas barrier resin is a mixed resin of at least one selected from polyamide, polyvinyl alcohol and poly (ethylene-co-vinyl alcohol) with a polyolefin having a carboxyl group. The container for high-purity chemicals according to claim 1, wherein 5. The resin composition according to claim 1, wherein the content of each of the neutralizing agent, antioxidant, and light stabilizer determined by liquid chromatography is 0.1% by weight or less of the resin composition. The container for high-purity chemicals according to claim 1.