WO1999012714A1 - Procede pour la preparation de pastilles de copolymere d'ethylene et d'acetate de vinyle saponifie - Google Patents
Procede pour la preparation de pastilles de copolymere d'ethylene et d'acetate de vinyle saponifieInfo
- Publication number
- WO1999012714A1 WO1999012714A1 PCT/JP1998/004007 JP9804007W WO9912714A1 WO 1999012714 A1 WO1999012714 A1 WO 1999012714A1 JP 9804007 W JP9804007 W JP 9804007W WO 9912714 A1 WO9912714 A1 WO 9912714A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pellet
- parts
- drying
- evoh
- weight
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/08—Copolymers of ethylene
- B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0085—Copolymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
Definitions
- the present invention relates to a method for producing a saponified ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVOH) pellet. More specifically, EV 0 H pellets with excellent pellet size accuracy can be manufactured continuously, and are excellent in melt moldability, especially in the case of multi-layer laminates. It relates to a method for producing H pellets. BACKGROUND ART In general, EVOH has excellent properties such as transparency, gas barrier properties, fragrance retention, solvent resistance, and oil resistance. Taking advantage of such characteristics, EVOH is formed into films and sheets for food packaging materials, pharmaceutical packaging materials, industrial chemical packaging materials, agricultural chemical packaging materials, etc., or containers such as bottles, and used for such purposes. ing
- ethylene and vinyl acetate are copolymerized to obtain an ethylene-vinyl acetate copolymer, and an EVOH alcohol solution or an alcohol / water mixed solvent solution obtained by saponifying the copolymer is used.
- a method is known in which the strand is extruded into a coagulating liquid in the form of a strand, and then the strand is cut into an EVOH pellet.
- the EVOH pellet obtained as described above is usually subjected to a drying treatment to become a product pellet.
- a drying treatment for example, in Japanese Patent Publication No. 46-37665, EV 0 H is heated at 95 ° C under an inert gas atmosphere having an oxygen content of 5% or less. Fluid drying with stirring is performed below.
- the product pellet obtained in this way is formed into various products.
- the molding is usually performed by melt molding, and the molding is performed to form a film, a sheet, a bottle, a cup, a tube, a pipe, or the like.
- the workability (formability) at that time is very important, and in general, mechanical strength, moisture resistance, and heat stress are important.
- a laminate is often formed by co-extrusion with a base material such as a polyolefin resin via an adhesive layer.
- the weight ratio of the coagulation liquid to the EVOH strand (coagulation liquid nostrand) is usually used to reduce the amount of solvent and to prevent loss due to dissolution of EVOH. ) Is set as small as less than 50.
- disadvantages such as strand breakage and inaccurate pellet size. Therefore, when the EVOH pellets obtained by the conventional method are used for extrusion molding, fluctuations in the amount charged to the extruder, fluctuations in the load on the extruder, etc. are likely to occur, so that a stable molding operation is not always easy. It becomes difficult to go. Therefore, EV OH pellets having a uniform shape are desired.
- the present invention relates to an EV OH pellet which is excellent in melt moldability, in particular, can suppress the generation of fish wire having a diameter of less than 0.1 in the production of a multilayer laminate, and has good long-run moldability. It is intended to provide a method of manufacturing.
- the method for producing a saponified ethylene-vinyl acetate copolymer (EVOH) pellet of the present invention comprises continuously extruding a solution of EVOH into a coagulating solution in a strand form, and then cutting the strand.
- a method for continuously producing pellets by setting the ratio XZY between the weight X of the coagulating liquid and the weight Y of the EVOH strand to 50 to 10,000. .
- the coagulation liquid contains 1 to 1000 Oppm of carboxylic acid, 1 to 50,000 ppm of carboxylic acid ester, or 1 to 15000 ppm of carboxylate.
- the EVOH pellets After adjusting the water content of the continuously produced EVOH pellets to 20 to 80% by weight, the EVOH pellets are composed of a boron compound (B), an acetate (C) and a phosphoric acid compound (D). It is desirable to contact an aqueous solution of at least one compound selected from the herd with a specific concentration.
- EVO H pellet is further subjected to a drying treatment by combining stationary drying and fluidized drying.
- the ethylene-vinyl acetate copolymer used as a raw material of the saponified ethylene monoacetate copolymer (EVOH) used in the present invention has an ethylene content of 15 to 60 mol%, particularly 20 to 55 mol%. It is preferred that If the ethylene content is less than 15 mol%, the precipitation will be incomplete, and a part of the strand will be eluted when the precipitate is formed in a coagulation solution after elevating the temperature to 0 ° H. H solution uniform Since it is necessary to pressurize or heat to a high temperature in order to maintain the solution state, it is not preferable in terms of operation, and furthermore, the gas barrier property at high humidity and the melt moldability at the time of EV 0 H are reduced.
- the ethylene monoacetate copolymer may contain, in addition to ethylene and vinyl acetate, an ethylenically unsaturated monomer copolymerizable therewith as a copolymerization component.
- the monomer include olefins such as propylene, isobutylene, ⁇ -octene, ⁇ -dodecene, and ⁇ -octadecene: acrylic acid, methacrylic acid, crotonic acid, maleic acid, and maleic anhydride.
- Unsaturated acids such as acid and itaconic acid, or salts thereof, and mono- or dialkyl esters: acrylonitrile, methacrylonitrile and other nitriles: acrylamide, methacrylamide, etc.
- Amides Refined sulfonic acids such as ethylene sulfonic acid, aryl sulfonic acid, and methacryl sulfonic acid, or salts thereof: Alkyl vinyl ethers: N-acrylamide methyltrimethylammonium chloride; Nil ketone: ⁇ -vinylpyrrolidone
- Polyoxyalkylene (meth) aryl ethers such as polyoxyethylene (meth) aryl ether and polyoxypropylene (meth) aryl ether; )
- Polyoxyalkylene (meth) acrylates such as acrylates: polyoxyalkylene (meth) acrylamides such as polyoxyethylene (meth) acrylamide, polyoxypropylene (meth)
- the EV 0 used in the present invention is obtained by saponifying the ethylene-vinyl acetate copolymer as described above. At this time, the saponification reaction is carried out in the presence of an alcohol catalyst, and Examples of catalysts include polyacetate butyl and ethylene-vinyl acetate copolymer. Any of the conventionally known catalysts used for the saponification reaction of the solid with an alkaline catalyst can be used. Specifically, alkali metal hydroxides such as sodium hydroxide, hydroxylating power, lithium hydroxide, alkali metal alcohols such as sodium methylate and t-butoxy potassium, and the like.
- DBU pendene-17
- alkali metal carbonates and alkali metal hydrogencarbonates are examples of alkali metal carbonates and alkali metal hydrogencarbonates.
- sodium hydroxide is preferred from the viewpoint of ease of handling and cost.
- the amount of the alkaline catalyst used depends on the desired degree of saponification, reaction temperature, etc., but is not more than 0.05 equivalent, preferably 0.03, based on the butyl acetate group in the ethylene monoacetate copolymer. It is appropriate that the amount is not more than the equivalent.
- an acid catalyst such as hydrochloric acid or sulfuric acid can be used instead of the alkali catalyst.
- the ethylene-vinyl acetate copolymer is dissolved in an alcohol or a medium containing an alcohol so as to have a concentration of usually about 20 to 60% by weight, and an alkali catalyst and, in some cases, an acid catalyst are used. And react at a temperature of 40 to 140 ° C.
- the concentration of EV 0 H is not particularly limited, but is usually 10 to 55% by weight, preferably 15 to 50% by weight. What is necessary is to make it.
- the degree of saponification of the vinyl acetate component of EVOH obtained by the above saponification is preferably from 70 to 100 mol%, particularly preferably from 80 to 100 mol%. If the saponification degree is less than 70 mol%, the gas barrier properties, thermal stability, moisture resistance, etc. of EVOH are undesirably reduced.
- EVOH of a certain composition may be used alone, or two or more EVOH of different compositions may be used in combination.
- the alcohol solution of EV 0 H obtained above may be used as it is, or preferably, directly with water, or the EV 0 H solution may be appropriately concentrated or diluted, and then water may be added.
- a solution for production is prepared.
- saturated fatty amides eg, stearic acid amide
- unsaturated fatty acid amides eg, oleic acid amide
- bisfatty acid amides eg, ethylene bistearic acid amide
- fatty acid metal salts eg, calcium stearate Lubricants such as low molecular weight polyolefins (for example, low molecular weight polyethylene or low molecular weight polypropylene having a molecular weight of about 500 to 1000), inorganic salts (for example, hide ⁇ -talcite), plasticizers (for example, Aliphatic polyhydric alcohols such as ethylene glycol, glycerin, and hexanediol), ultraviolet absorbers, antioxidants, coloring agents, antibacterial agents, fillers, and other resins may be added.
- low molecular weight polyolefins for example, low molecular weight polyethylene or low molecular weight polypropylene having a molecular weight of about 500 to 1000
- the concentration of ⁇ V 0 ⁇ in the solution is preferably 10 to 55% by weight, and It is preferably set to 20 to 50% by weight. If the EVOH concentration is less than 10% by weight, coagulation in the coagulating liquid becomes difficult, while if it exceeds 55% by weight, the porosity (porosity) of the obtained EVOH pellets decreases, and the heat stability during molding is reduced. Adversely affect sex.
- the EVOH solution is a solution of a mixed solvent of alcohol and water, but the mixing ratio of alcohol / water at this time is 90-10-30 / 70 by weight, particularly It is preferable that the adjustment be made so as to be in the range of 800 to 400. If the alcohol water ratio exceeds 910, the solution becomes slightly unstable and the porosity at the time of strand deposition decreases slightly, while if it is less than 30/70, the solution becomes unstable. In some cases, precipitation of EVOH may be caused.
- the present invention provides a method of continuously extruding the above EVOH solution into a coagulating liquid in a strand form by adjusting the ratio XZY between the weight X of the coagulating liquid and the weight Y of the EVOH strand. It is the biggest feature.
- the weight ratio at this time needs to be 50 to 100,000. If the weight ratio X / Y is less than 50, problems such as breakage of the strand occur, and X / Y If Y exceeds 1000, the loss due to the dissolution of EVOH in the coagulation liquid increases, which is inappropriate.
- the lower limit of the weight ratio X / Y is preferably at least 100, more preferably at least 200, particularly preferably at least 300, especially preferably at least 500.
- the upper limit of the weight ratio is preferably 800 or less, more preferably 700 or less, and particularly preferably 600 or less.
- the coagulating liquid examples include water or a mixed solvent of water and alcohol: aromatic hydrocarbons such as benzene: ketones such as acetate and methylethyl ketone: ethers such as dibutyl ether and ether: methyl acetate and ethyl acetate. And organic acid esters such as methyl propionate; and the like, but water or a mixed solvent of water / alcohol is preferred.
- aromatic hydrocarbons such as benzene: ketones such as acetate and methylethyl ketone: ethers such as dibutyl ether and ether: methyl acetate and ethyl acetate.
- organic acid esters such as methyl propionate; and the like, but water or a mixed solvent of water / alcohol is preferred.
- the alcohol concentration of the coagulating liquid when using alcohol is the same as that of the EV 0 H solution. It is preferable that the alcohol content of the alcoholic water mixture is equal to or lower than the alcohol content. If the alcohol concentration of the coagulation liquid becomes higher than the allowable range in the EVOH solution, the precipitation of the strands in the coagulation liquid may occur. EVOH losses increase and are not preferred.
- alcohols such as methanol, ethanol, and propanol are used, and methanol is particularly preferable.
- the coagulation liquid further contain at least one selected from carboxylic acid, carboxylic acid ester and carboxylate in a specific amount.
- the content of the carboxylic acid when the inclusion of the carboxylic acid into a coagulation solution 1 ⁇ 1 0 0 0 O ppm , preferably 5 0 ⁇ 5 0 0 0 p P m.
- the carboxylic acid content is less than 1 ppm, the curing time of the strand becomes longer, and the strand tends to be cut. Also, even if the carboxylic acid content exceeds 1000 ppm, strands are likely to break.
- the carboxylic acid is not particularly limited, but includes formic acid, acetic acid, propionic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, crotonic acid, maleic acid, itaconic acid, and the like.
- acetic acid is particularly preferred.
- the content of the carboxylic acid ester is 1 to 500 ppm, preferably 10 to 100 ppm.
- the content of the carboxylic acid ester is less than 1 ppm or more than 50,000 ppm, disadvantages such as a longer curing time of the strand and breakage of the strand are likely to occur.
- the carboxylic acid ester is not particularly limited, but may be methyl formate, ethyl formate, propyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, methyl ethyl brobionate, methyl acetoacetate, or acetoacetate.
- the content of the carboxylate is 1 to 1500 ppm, preferably 10 to 500 ppm.
- the carboxylate content is less than 1 ppm or more than 1500 ppm, inconveniences such as prolonged strand curing time and strand breakage are likely to occur. No.
- the carboxylate is not particularly limited, and examples include sodium formate, potassium formate, magnesium formate, calcium formate, sodium acetate, potassium acetate, magnesium acetate and the like. Particularly preferred is sodium acetate.
- the contact time between the coagulating solution and the EVOH strand is preferably 10 seconds to 60 minutes, and more preferably 15 seconds to 5 minutes. If the contact time is less than 10 seconds, the curing of the strand in the coagulating liquid is insufficient, while if it exceeds 60 minutes, the loss due to dissolution of EVOH in the coagulating liquid tends to increase.
- the temperature at which the E V 0 H solution is brought into contact with the coagulating liquid is suitably from 10 ° C. to 40 ° C., preferably 0 ° C., and the operation at a low temperature is safe as much as possible.
- the solution of EVOH is extruded in a strand form into the coagulating liquid by a nozzle having a hole of any shape, usually a circular hole.
- the shape of the above nozzle is not particularly limited, but is preferably a cylindrical shape.
- the length of the nozzle is 1 to 10 Ocm, preferably 330 cm, and the inner diameter of the nozzle is 0.110 cm, preferably 0.25 cm. cm.
- the nozzle has a cylindrical shape with a ratio of length to inner diameter (length / inner diameter) of 840.
- the thickness of the nozzle is 0.01 0.5 cm, preferably 0.1 0.3 cm.
- the cross-sectional shape of the nozzle is preferably circular as described above, but may be elliptical, square, diamond-shaped, star-shaped, or the like in some cases.
- the nozzle EV0H is extruded in the form of a strand, but the strand is not necessarily one, and it can be extruded with any number between several and several hundred .
- the EVOH extruded in a strand shape is cut after sufficient coagulation has progressed, and turned into pellets.
- the shape of the obtained EVOH pellet is not particularly limited.However, from the viewpoint of workability during molding and handling, the shape of the column is 11 Omi in length and 11 Omm in length. Those with about 1 to 10 are practical.
- the resulting EVOH pellet is then usually washed with water.
- washing condition a method of washing the EVOH pellet in a water bath containing a temperature of 160 ° C. and / or a water containing an acid is usually adopted. This washing removes oligomers and impurities in EVOH.
- an EV0H pellet continuously and excellent in pellet size accuracy can be obtained.
- the EVOH pellets obtained as described above are preferably directly subjected to a two-stage drying treatment as described below, but before the drying treatment, the boron compound (B), the acetate ( Melt formability, especially mechanical strength and thermal stability in multilayer laminates, by treatment with an aqueous solution of at least one compound selected from the group consisting of C) and phosphoric acid compound (D) at a specific concentration
- the boron compound (B) the acetate
- Melt formability especially mechanical strength and thermal stability in multilayer laminates
- the water content of the EV 0 H pellet at the time of performing this treatment must be adjusted to 20 to 80% by weight (preferably 30 to 70% by weight, particularly 35 to 65% by weight). If the water content of the EVOH pellets is less than 20% by weight, the resulting EVOH pellets will be subject to frequent microfissures when melt-molded, while if the water content exceeds 80% by weight, the following will occur. In the drying process, the EV 0 H pellet fuses.
- the above EVOH pellet is preferably a porous precipitate.
- the porous precipitate has a microporous internal structure in which pores having a diameter of 0.1 to 10 ⁇ are uniformly distributed, and the above-mentioned EVOH solution (such as an alcohol-water mixed solvent) is coagulated in a coagulation bath.
- the temperature of the coagulation bath (10 ° C. to 40 ° C.) the residence time (10 seconds to 60 minutes) and the like can be obtained.
- Examples of the boron compound (B) include boric acid or a metal salt thereof, such as calcium borate, cobalt borate, zinc borate (zinc tetraborate, zinc metaborate, etc.), aluminum borate, potassium, boric acid Ammonium (ammonium metaborate, ammonium tetraborate, ammonium pentaborate, ammonium octaborate, etc.), cadmium borate (cadmium orthoborate, cadmium tetraborate, etc.), potassium borate (metaborate) Potassium borate, potassium tetraborate, potassium pentaborate, potassium hexaborate, potassium octaborate, etc., silver borate (silver metaborate, silver tetraborate, etc.), copper borate (secondary boric acid) Copper, copper metaborate, copper tetraborate, etc., sodium borate (sodium metaborate, sodium diborate, sodium tetraborate)
- Examples of the acetate (C) include sodium acetate, potassium acetate, calcium acetate, magnesium acetate, zinc acetate, barium acetate, manganese acetate, and the like. Sodium, potassium acetate, calcium acetate, and magnesium acetate are used.
- Examples of the phosphoric acid compound (D) include sodium dihydrogen phosphate, sodium hydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, Tricalcium phosphate, calcium monohydrogen phosphate, calcium dihydrogen phosphate, tricalcium phosphate, magnesium phosphate, magnesium hydrogen phosphate, magnesium dihydrogen phosphate, phosphoric acid Zinc hydrogen, barium hydrogen phosphate, manganese hydrogen phosphate and the like can be mentioned, preferably, sodium dihydrogen phosphate, potassium dihydrogen phosphate, dihydrogen phosphate Calcium and magnesium dihydrogen phosphate are used.
- the EVOH pellet is brought into contact with an aqueous solution of the above compound after adjusting its water content to 20 to 80% by weight as described above.
- concentration of the compound in the aqueous solution is as follows. It is desirable to set as follows.
- the content of the boron compound (B) in the aqueous solution of the boron compound (B) is compared with the water contained in the EVOH pellet and the aqueous solution of the boron compound (B).
- 0.001 to 0.5 parts by weight further 0.001 to 0.3 parts by weight, especially 0.002 to 0.2 parts by weight
- the concentration is less than 0.001 parts by weight
- the EVOH pellet contains a predetermined amount of the boron compound (B).
- the amount exceeds 0.5 parts by weight fine fish eyes frequently occur in a molded article of the resin composition, and the object of the present invention cannot be achieved. At this time, 0.001 ⁇
- the content of the acetate (C) in the aqueous solution of the acetate (C) is included in the water contained in the EVOH pellet and the aqueous solution of the acetate (C). 0.001 to 0.5 parts by weight based on 100 parts by weight of water
- the content may contain about 0.001 to 0.1% by weight of methanol, ethanol, propanol, methyl acetate, ethyl acetate and the like.
- the content of the phosphoric acid compound (D) in the aqueous solution of the phosphoric acid compound (D) is determined by comparing the content of the phosphoric acid compound (D) with the water contained in the EVOH pellet.
- the concentration is less than 0.0001 part by weight, it becomes difficult to contain a predetermined amount of the phosphoric acid compound (D) in the EVOH pellet, while when the concentration exceeds 0.5 part by weight, fine fish eyes frequently occur in the molded article of the resin composition. Therefore, the object of the present invention cannot be achieved. At this time, 0.001 ⁇
- the content of the boron compound (B) is 0.001 to 1 part by weight in terms of boron (further 0.001 to 0.5 part by weight) with respect to 100 parts by weight of EVOH of the EVOH beret. , Especially 0.002 to 0.2 parts by weight, and in the case of acetate (C), the content is 0.001 to 0.05 parts by weight in terms of metal (further 0.0015 to 0.04 parts by weight, especially
- the content is 0.0005 to 0.1 parts by weight (further, 0.001 to 0.05 parts by weight, particularly 0.002 to 0.03 parts by weight) in terms of a phosphate group.
- the content of these compounds is less than the above range, the moldability of the EVOH pellet is deteriorated, and when the content of these compounds is more than the above range, the molded product when the EVOH pellet is molded. Appearance is reduced.
- the concentration of the aqueous solution of the acid compound (D), the water content of the EVOH pellet, the contact time, the temperature, the stirring speed and the like may be controlled, and there is no particular limitation.
- the EVOH pellets treated with the aqueous solutions (B) to (D) are then subjected to a drying step to become product pellets.
- the water content of the EVOH pellets to be subjected to the drying treatment is 20 to 80% by weight (particularly 30 to 70% by weight). If the water content is less than 20% by weight, the melt formability tends to be poor, while if it exceeds 80% by weight, the pellets may be fused at the stage of drying.
- various drying methods can be adopted as such a drying method.However, two-stage drying is performed by combining fluidized drying and standing drying, that is, after the fluidized drying treatment, A method of performing a static drying process or a method of performing a fluid drying process after the static drying process is particularly preferable, and therefore, such a drying method will be described below.
- the fluidized drying as used herein means drying performed while the EVOH pellets are substantially agitated and dispersed by mechanical or hot air.
- dryers for fluidized drying include cylindrical / groove type stirring dryers, cylindrical dryers, rotary dryers, fluidized bed dryers, vibrating fluidized bed dryers, and conical rotary dryers.
- stationary drying means drying in which the EVOH pellet is substantially not subjected to dynamic actions such as stirring and dispersion.
- dryers for static drying include batch box dryers for stationary materials, and band dryers, tunnel dryers, and vertical dryers for material transfer types. And silo dryers.
- either of the fluidized drying and the standing drying may be performed first.After the fluidized drying is performed as the primary drying, the stationary drying is performed as the secondary drying. Alternatively, static drying may be performed as primary drying, followed by fluidized drying as secondary drying, but the former method is usually preferred.
- the former method a method in which fluidized drying is performed as primary drying, followed by standing drying as secondary drying
- the method is not limited thereto, and the latter method is used. Also, the former method may be used.
- Air or inert gas (nitrogen gas, helium gas, argon gas, etc.) is used as the heating gas used for fluidized drying in the primary drying.
- the temperature of the heating gas at this time is suitably 95 ° C or lower, more preferably 90 to 40 ° C, particularly preferably 90 to 55 ° C. If the heating gas temperature exceeds 95 ° C, the EVOH pellet may be fused.
- the passage speed of the heating gas in the dryer is suitably 0.7 to 1 Om / sec, more preferably 0.7 to 5 m / sec, particularly preferably 1 to 3 m / sec. If the passage speed is less than 0.7 m / sec, the fusion of the EVOH pellet is likely to occur, while if it exceeds 10 m / sec, the EVOH pellet tends to be chipped.
- the velocity of the heated gas passing through the pellet surface is reduced. 1 to 10 m / sec, and in the second drying to be described later, the velocity of the heated gas passing through the pellet surface should be less than 1 m / sec, and / or in the first drying, the following equation (1) )) Is preferably 5 to 500 parts by weight time (hr), and in the secondary drying, the speed is preferably 0.1 to 5 parts by weight time (hr).
- the velocity of the heating gas passing through the surface of the EVOH pellet at the time of the first drying is 1 to 1 Om / sec, more preferably 1 to 5 m / sec, Particularly, it is preferable to set l to 3 m / sec.
- This speed may be adjusted by adjusting the amount of gas passing or satisfying the above conditions within the range of the passing speed of the heated gas, or by adjusting the flow speed of the EVOH pellet.
- the average drying speed in the primary drying is preferably 5 to 500 parts by weight (hr), particularly preferably 10 to 300 parts by weight / hour (hr), and the speed is 5 parts by weight. If the time is less than Z hours (hr), fusion of the EVOH pellet may occur during drying, while if it exceeds 500 parts by weight Z hours (hr), the resulting EVOH pellets may be melted. Molding may cause the generation of micro fish eyes.
- Fluid drying time cannot be specified unconditionally depending on the throughput of the EVO H pellet, but is usually 5 minutes to 36 hours, particularly 10 minutes to 24 hours.
- the EVOH pellets are dried by the above-mentioned fluid drying so that the water content of the EVOH pellets becomes 5 to 60% by weight (furthermore, 10 to 55% by weight). Is preferably 10 to 45% by weight. If the moisture content is less than 5% by weight, discharge fluctuations are likely to occur when the product after standing drying described below is melt-molded. On the other hand, if it exceeds 60% by weight, fusion of pellets will occur during standing drying. Fishery may occur when the product pellets after standing and drying are melt-molded, especially when containing boron compounds (B), acetates (C) or phosphate compounds (D). In this case, micro fish eyes tend to occur frequently, which is not preferable. Further, even if the water content is lower than the water content before fluid drying by less than 5% by weight, the fine fish eyes tend to occur frequently, which is not preferable.
- B boron compounds
- C acetates
- D phosphate compounds
- Inert gas nitrogen gas, helium gas, argon gas, etc.
- the temperature of the heating gas is preferably 75 ° C. or higher, more preferably 85 to 150 ° C. If the temperature is lower than 75 ° C, the drying time becomes extremely long, which is economically disadvantageous.
- the gas passing speed in the dryer is preferably less than 1 m / sec, and more preferably 0.01 to 0.5 m / sec. If the passage speed exceeds 1 m / sec, it becomes difficult to keep the EVOH pellet stationary.
- the time for the static drying treatment cannot be unconditionally determined depending on the treatment amount of the EVOH pellet, it is usually preferably 10 minutes to 72 hours, and more preferably 1 to 48 hours.
- the average drying rate in the secondary drying is preferably 0.1 to 5 parts by weight / hour (hr), particularly preferably 0.3 to 3 parts by weight Z hour (hr). If it is less than 5, the pellets are likely to be fused and the drying time is prolonged. On the other hand, if it exceeds 5 parts by weight / hour (hr), fine fish may be generated frequently when the obtained EVOH pellet is melt-molded. There is.
- the water content of the EVOH pellets be 2% by weight or less, particularly 0.001 to 2% by weight (more preferably 0.01 to 1% by weight) by the above-mentioned secondary drying (static drying). If the water content is less than 0.001% by weight, the long-run formability tends to decrease, while if the water content exceeds 2% by weight, foaming tends to occur in the molded product. According to the above-described method of the present invention, an EV0H pellet having excellent heat stability and long-run moldability can be obtained. However, such a pellet further includes a plasticizer and a plasticizer, if necessary.
- Additives such as heat stabilizers, UV absorbers, antioxidants, colorants, antimicrobial agents, fillers, and other resins can also be used.
- a gel generation inhibitor a talcite-based compound having a mouth opening, a hindered phenol-based compound, a hinderamine-based heat stabilizer, and a metal salt of a higher aliphatic carboxylic acid can be added.
- EVOH ethylene content differs by 5 mol% or more, and / or the degree of saponification increases.
- an EVOH blend that differs by 1 mol% or more, the stretchability during high stretching and the secondary workability such as vacuum pressure forming and deep drawing can be further improved while maintaining gas barrier uniformity.
- the EV0H pellets thus obtained are frequently used for molded products, and are formed into repellets, films, sheets, containers, fibers, rods, pipes, various molded products, etc. by melt molding, etc. Is done.
- these molded products can be used again for melt molding by using pulverized products (for example, when reusing recovered products) or repellets.
- Extrusion molding methods (T-die extrusion, inflation extrusion, blow molding, melt spinning, profile extrusion, etc.) and injection molding methods are mainly adopted as the melt molding method.
- the melt molding temperature is often selected from the range of 150 to 300 ° C.
- the obtained EVOH pellets are often used for laminates, and are particularly used as a laminate having a structure in which a thermoplastic resin layer is laminated on at least one side of a layer composed of EVOH.
- Lamination methods include, for example, a method in which a thermoplastic resin is melt-extruded into an EVOH film or sheet, a method in which EV0H is melt-extruded into a base material such as a thermoplastic resin, and a method in which EV0H is mixed with another thermoplastic resin.
- a method of co-extrusion with a resin, and further, a film sheet of EVOH obtained in the present invention and a film or sheet made of another base material are combined with an organotitanium compound, an isocyanate compound, a polyester compound, or a polyurethane compound.
- the mating resin is linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl acetate copolymer, ionomer, ethylene-propylene copolymer, ethylene Monoacrylate copolymer, polypropylene, propylene mono-alpha-olefin (alpha-alpha olefin with 4 to 20 carbon atoms) copolymer, homo- or copolymer of olefin such as polybutene, polypentene, etc.
- polyolefin resins in a broad sense, such as those obtained by graft-modifying the homopolymer or copolymer of these olefins with an unsaturated carboxylic acid or an ester thereof, may be mentioned, and polyester, polyamide, copolymerized polyamide, Polyvinyl chloride, polyvinylidene chloride, acrylic resin, polystyrene, vinyl Ester resin, polyester elastomer mono-, polyurethane Heras Bok mer, chlorinated polyethylene, and chlorinated polypropylene.
- EV 0 H can also be co-extruded.
- polypropylene, polyamide, polyethylene, ethylene-vinyl acetate copolymer, polystyrene, and polyester are preferably used.
- a molded product such as a film or a sheet is once obtained from the ⁇ V 0 ⁇ ⁇ pellet obtained by the present invention, and another substrate is extrusion-coated thereon, or a film or sheet of another substrate is bonded with an adhesive.
- thermoplastic resin in addition to the above-mentioned thermoplastic resin, any substrate (paper, metal foil, uniaxially or biaxially stretched plastic film or sheet, woven fabric, nonwoven fabric, metal flocculent material, wood material Etc.) can be used.
- the layer structure of the laminate is such that the layer of EV 0 H is a (a, a 2 , ...) and the other base material, for example, the thermoplastic resin layer is b (bi, b 2 , ...) when a film, a sheet, if a bottle shape, not only the two-layer structure aZb, bZa / b, a / b / a, ai / a 2 / b, a / b, / b 2, b 2 / b ! Any combination such as / a / bi / b 2 is possible.
- a and b are bimetallic, core (a) —sheath (b) type, core (b) —sheath (a) type Alternatively, any combination such as an eccentric core-sheath type is possible.
- the above-mentioned laminate is used as it is, but it is also preferable to perform a stretching treatment in order to further improve the physical properties of the laminate.
- Stretching may be either uniaxial stretching or biaxial stretching, and it is better to perform stretching at the highest possible magnification in terms of physical properties.
- pinholes, cracks, and uneven stretching are caused during stretching. It is possible to obtain a stretched film, a stretched sheet, a stretched bottle, and the like free from delamination and the like.
- the stretching method besides the roll stretching method, the tenter stretching method, the tubular stretching method, the stretch stretching blow method, and the like, a deep drawing method, a vacuum forming method or the like having a high stretching ratio can be employed.
- biaxial stretching any of a simultaneous biaxial stretching method and a sequential biaxial stretching method can be adopted.
- the stretching temperature is selected from the range of 80 to 170 ° (preferably, 100 to 160 ° C).
- heat setting is usually performed.
- the heat setting can be performed by a well-known means, and the stretched film is heat-treated at 80 to 170 ° C, preferably 100 to 160 ° 0 for about 2 to 600 seconds while maintaining the stretched state in tension. .
- the shape of the laminate thus obtained is arbitrary, and examples thereof include a film, a sheet, a tape, a bottle, a pipe, a filament, and an extruded product having a modified cross section.
- heat treatment, cooling treatment, rolling treatment, printing treatment, drying treatment, solution or melt coating treatment, bag making processing, deep drawing processing, box processing, and tube processing are performed as necessary. Processing, split processing, etc. can be performed.
- the films, sheets, containers, and the like obtained as described above are particularly useful as packaging materials for containing various kinds of articles to be packed, such as foods, pharmaceuticals, industrial chemicals, and agricultural chemicals.
- MI is the melt index (g / 10 min) measured at 210 ° C and a load of 2160 g.
- a methanol solution containing 50% of an ethylene-vinyl acetate copolymer having an ethylene content of 35 mol% contains 0.017 equivalent of sodium hydroxide with respect to the butyl acetate group in the copolymer.
- 150 parts of methanol were fed.
- 100 parts of methanol On the other hand, 60 parts of a methanol-water mixed solvent mixed with 50 parts of water was supplied at an azeotropic point.
- the reaction temperature was 128-140 ° C, and the pressure was 5 kg / cm 2 G.
- the obtained EVOH solution (resin concentration 40%) was a completely transparent homogeneous solution, and the saponification degree of the vinyl acetate component was 99.8 mol%.
- this EVOH solution was added at a rate of 10 kg / hr to a coagulating liquid tank containing 83 kg of coagulating liquid maintained at 5 ° C and having a composition of 5% methanol and 95% water, and having a pore size of 0.4%.
- Extruded into a strand form from a cylindrical nozzle with a length of 6.0 cm and a length of 6.0 cm and a thickness of 0.3 cm, and brought into contact with the coagulation liquid for 30 seconds, and then stretched with a take-off roller attached to the end of the coagulation liquid tank was extracted from the coagulation solution (the weight ratio of coagulation solution / EV0H strand was 100 000).
- the strand after solidification was cut with a cutter to obtain a porous pellet.
- the resulting pellets were uniform in shape and had no deformation.
- the operation of washing the porous pellet in a water bath at a temperature of 3 crc for 1 hour was repeated four times to remove sodium acetate, followed by washing in an acetic acid solution at a temperature of 30 ° C for 1 hour, and then drying.
- the target pellet white pellet with a diameter of 3.8 mm and a length of 4 mm was obtained.
- the following items were evaluated for the above manufacturing process.
- the hardness of the strand immediately after being drawn out of the coagulating liquid was measured with a spring-type hardness tester (manufactured by Shimadzu Corporation) according to JIS K6301, and evaluated as follows.
- the diameter and length of the 100 pellets were measured with calipers, and the ratio of the pellets whose diameter and length were within a range of ⁇ 0.2 mm was measured and evaluated as follows. ⁇ 95% or more
- a pellet was produced in the same manner as in Example 1 except that the amount of the coagulating liquid was adjusted to set the weight ratio of coagulating liquid / EV0H strand to 500. Was evaluated.
- the pellets were prepared in the same manner as in Example 1 except that the contact time between the strand and the coagulating liquid was set to 5 minutes and the weight ratio of the coagulating liquid ZEV0H strand was set to 100. Manufactured and evaluated similarly.
- Pellet was prepared in the same manner as in Example 1 except that the contact time between the strand and the coagulating liquid was set to 20 seconds and the weight ratio of the coagulating liquid ZEV0H strand was set to 1490. Was manufactured and evaluated similarly.
- a pellet was produced and evaluated in the same manner as in Example 1 except that the amount of the coagulating liquid was reduced and the weight ratio of the coagulating liquid ZEV0H strand was set to 30.
- a pellet was produced in the same manner as in Example 1 except that the amount of the coagulating liquid was increased and the weight ratio of the coagulating liquid / EV0H strand was set to 1200. evaluated.
- the evaluation results of Examples 1 to 4 and Comparative Examples 1 to 2 are shown in Table 1.
- the water content 62.5% aqueous methanol solution 6 0 parts supplies under azeotropically methanol solution of the above EV 0 H, 1 00 ⁇ 1 1 0 ° C, at a pressure 3 kg / cm 2 G, Methanol was distilled off until the resin concentration in the aqueous methanol solution of EV 0 H became 40% to obtain a completely transparent methanol-water homogeneous solution.
- the resin is extruded in a strand form at a speed of 1 Okg / hr from a cylindrical nozzle with a length of 6.Ocm, and the residence time in the coagulating liquid is reduced to 3 minutes by a take-off roller attached to the end of the coagulating liquid tank.
- the production strand was drawn out of the coagulation liquid so as to be as follows.
- the number of the nozzles was 10 and the number of strands was 10.
- the solidified strand was cut with a cutter to obtain a porous pellet.
- the resulting pellets were uniform in shape and had no deformation.
- This pellet was washed four times in a water bath at a temperature of 30 ° C for 1 hour to remove sodium acetate, and further washed in an aqueous solution of acetic acid at a temperature of 30 ° C for 1 hour. Dry, target etch A sachet of ren-vinyl acetate copolymer (a cylindrical white pellet with an average diameter of 3.8 mm and an average length of 4 mm) was obtained.
- the strands immersed in the coagulation liquid were taken out over time, and the time until the hardness reached 30 was measured and evaluated as follows.
- the hardness was measured using a spring-type hardness tester (manufactured by Shimadzu Corporation) in accordance with JIS K6301.
- ⁇ 40 seconds or more and less than 60 seconds
- the diameter and length of 100 pellets were measured with calipers, and the percentage of pellets with a diameter of 3.8 ⁇ 0.2 mm and a length of 4 mm ⁇ 0.2 mm was measured. was evaluated as follows.
- a pellet was produced and evaluated in the same manner as in Example 5, except that the content of acetic acid in the coagulation liquid was changed to 100 Oppm.
- a pellet was produced in the same manner as in Example 5 except that methyl acetate was used as the coagulating liquid, and evaluated in the same manner.
- Example 5 Same as Example 5 except that propionic acid was used instead of acetic acid. A pellet was produced in the same manner as described above, and was similarly evaluated.
- a pellet was produced and evaluated in the same manner as in Example 5, except that methyl acetate was used instead of acetic acid in Example 5.
- a pellet was produced in the same manner as in Example 9 except that the composition of the coagulating liquid was adjusted to make the content of methyl acetate in the coagulating liquid 1000 ppm, and the evaluation was performed in the same manner. did.
- a pellet was produced and evaluated in the same manner as in Example 5, except that sodium acetate was used instead of acetic acid in Example 5 at 10 ppm.
- a pellet was produced in the same manner as in Example 11 except that the composition of the coagulation solution was adjusted to make the content of sodium acetate in the coagulation solution 40 ppm. It was evaluated as follows.
- a pellet was produced in the same manner as in Example 5 except that the content of acetic acid in the coagulation liquid was changed to O ppm, and the pellet was evaluated in the same manner.
- a pellet was produced and evaluated in the same manner as in Example 5, except that the content of acetic acid in the coagulating liquid was set to 2000 ppm.
- a pellet was produced in the same manner as in Example 9 except that the content of methyl acetate in the coagulation liquid was changed to O ppm, and the pellet was evaluated in the same manner.
- Pellets were produced and evaluated in the same manner as in Example 9 except that the content of methyl acetate in the coagulating liquid was set at 700 ppm in Example 9.
- a pellet was produced and evaluated in the same manner as in Example 11 except that the content of sodium acetate in the coagulation liquid was changed to O ppm.
- Comparative Example 8 Pellets were produced and evaluated in the same manner as in Example 11, except that the content of sodium acetate in the coagulation liquid was changed to 2,000 Oppm. Table 2 shows the evaluation results of Examples 5 to 12 and Comparative Examples 3 to 8. In these Examples 5 to 12 and Comparative Examples 3 to 8, the weight ratio of the coagulating liquid ZEVOH strand was all 300.
- the obtained resin composition (porous pellet) was dried by the following method.
- the resin composition obtained above was dried using a batch type fluidized bed dryer (tower type) for about 3 hours while flowing nitrogen gas at 75 ° C to obtain a resin composition having a water content of 20%.
- a batch type fluidized bed dryer tower type
- nitrogen gas at 75 ° C
- the resin composition after the above-mentioned fluidized drying treatment is dried with nitrogen gas at 125 ° C for about 18 hours using a batch-type box dryer (ventilated) to obtain a target resin having a water content of 0.3%.
- the boron compound (B) was contained in 0.038 parts in terms of boron with respect to 100 parts of EVOH (A)].
- the obtained resin composition is supplied to a multilayer extruder equipped with a 5-layer feed block T-die and a polyethylene layer (“Novatech LDLF525H” manufactured by Mitsubishi Chemical Corporation) Z adhesive resin layer ( Mitsubishi Chemical Co., Ltd. “Modic AP 240 HJ” Multilayer laminate of 3 layers and 5 layers of adhesive resin layer (same as left) / polyethylene layer (same as left) 10/50 ( ⁇ .)),
- the generation of fine fish with a diameter of less than 0.1 mm and long-run formability were evaluated in the following manner.
- the obtained resin composition pellet was dried by the following method.
- the resin composition pellet obtained above was dried for about 3 hours using a fluidized-bed drier (continuous horizontal multi-chamber type) while flowing nitrogen gas at 75 ° C to obtain a water content of 20%.
- a resin composition was obtained. Since the water content of the resin composition before fluid drying is 55%, the difference in water content between the resin composition before and after fluid drying is 35%.
- the resin composition pellet after the above-mentioned fluid drying treatment was dried with a nitrogen gas at 120 ° C for about 24 hours using a batch-type box dryer (ventilated) to obtain a water content of 0.2%.
- a resin composition pellet [0.032 parts of boron compound (B) was contained per 100 parts of EV0H (A) in terms of boron] was obtained.
- Example 13 except that the drying treatment was performed by changing the drying treatment method as follows, the desired resin composition pellet [EVOH (A) 100 parts of the boron compound (B ) In terms of boron).
- the obtained resin composition pellet was dried with a nitrogen gas at 70 ° C. for about 5 hours using a batch box dryer (ventilation type) to obtain a resin composition pellet having a water content of 30%. Obtained.
- the water content of the resin composition pellet before standing and drying was 50%, and the difference in water content between the resin composition pellets before and after standing and drying was 20%.
- the resin composition pellet after the standing drying treatment was dried for about 18 hours while flowing nitrogen gas at 120 ° C using a batch-type box dryer (ventilated type) to obtain a water content. 0.2% of a target resin composition pellet [containing 0.038 parts of boron compound (B) in terms of boron based on 100 parts of EVOH (A)] was obtained.
- EVOH Ethylene content: 30 mol%, degree of saponification: 99.6 mol%, Ml: 12]
- Aqueous nomethanol (50/50 by weight) solution 60 ° C maintained at 5 ° C
- the EVOH pellet is further cooled to 30 ° C.
- the mixture was poured into an aqueous acetic acid solution and stirred for about 2 hours to obtain a porous precipitate having a water content of 50% (a microbolus having an average diameter of 4 ⁇ uniformly exists).
- the obtained resin composition pellet was dried by the following method.
- the obtained resin composition pellet was dried for about 8 hours with nitrogen gas at 70 using a batch-type air-flow box type drier to obtain a resin composition pellet having a water content of 25%. . Standing still Since the water content of the resin composition before drying is 50%, the difference in water content between the resin compositions before and after drying is 25%.
- the resin composition pellet after the standing drying treatment was dried for about 18 hours while flowing nitrogen gas at 125 ° C using a batch-type bed type fluidized bed dryer to obtain a water content of 0.3%.
- the desired resin composition pellet [containing 0.02 parts of boron compound (B) in terms of boron with respect to 100 parts of EVOH (A)] was obtained.
- Example 13 100 parts of the porous precipitate obtained in Example 13 was put into 200 parts of a 0.05% aqueous solution of calcium acetate (B) (0.04 parts of calcium acetate (B) was added to 100 parts of total water). ), And stirred at 30 ° C for 5 hours, and a resin composition pellet consisting of EVOH (A) and acetate (B) [100 parts of EVOH (A) was converted to calcium equivalent of acetate (B). Containing Q.008 parts].
- the obtained resin composition pellet was dried in the same manner as in Example 13 to obtain 0.3% of the desired resin composition pellet [EVOH (A) per 100 parts. 0.008 parts of acetate (B) in terms of calcium] was obtained.
- Example 14 100 parts of the porous precipitate obtained in Example 14 was put into 300 parts of a 0.06% aqueous solution of potassium acetate (B) (total water content of 100 parts of potassium acetate (100 parts)). B) is 0.05 parts), and the mixture is stirred at 30 ° C for 5 hours, and a resin composition pellet composed of EVOH (A) and acetate (B) [100 parts of EVOH (A) is mixed with acetate (100 parts). B) was 0.01% by potassium conversion].
- the obtained resin composition pellet was dried in the same manner as in Example 14 to obtain a resin composition pellet having a water content of 0.2% [EV OH (A) 100 parts of acetic acid. Salt (B) in 0.01 parts by weight in terms of potassium].
- a target resin composition pellet was obtained in the same manner as in Example 17 except that the drying treatment was performed in the following manner, except that the drying treatment was changed as follows.
- the obtained resin composition pellet was dried with nitrogen gas at 70 ° C. for about 5 hours using a batch-type box dryer (ventilation type) to obtain a resin composition pellet having a water content of 30%. Get a bird Was.
- the water content of the resin composition before standing drying was 50%, and the difference in water content between the resin composition before and after drying was 20%.
- the resin composition pellet after the standing drying treatment was dried for about 18 hours using a batch-type box dryer (ventilated) while flowing nitrogen gas at 120 ° C. for about 18 hours.
- a target resin composition pellet having a rate of 0.2% was obtained.
- Example 16 100 parts of the porous precipitate obtained in Example 16 was added to 250 parts of a 0.06% aqueous sodium acetate (B) solution, and the mixture was stirred at 30 ° C for about 4 hours to obtain EVO H ( A resin composition pellet consisting of A) and the acid salt (B) [containing 0.015 parts of acetate (B) in terms of sodium per 100 parts of EVOH (A)] was obtained.
- the obtained resin composition pellet was dried in the same manner as in Example 16 to obtain a desired resin composition pellet having a water content of 0.3% [EVOH (A) 100 parts of acetate ( B) in the form of sodium in an amount of 0.015 part].
- Example 13 100 parts of the porous precipitate obtained in Example 13 was added to 200 parts of a 0.06% aqueous solution of magnesium dihydrogen phosphate (B) (phosphoric acid was added to 100 parts of total water). 0.048 parts of dihydrogen magnesium (B)), stirred at 30 ° C for 5 hours, and pelletized a resin composition comprising EVOH (A) and a phosphoric acid compound (B) [100 parts of EVOH (A). Then, the phosphoric acid compound (B) was contained in an amount of 0.012 parts in terms of phosphoric acid root].
- B magnesium dihydrogen phosphate
- the obtained resin composition pellet was subjected to drying treatment in the same manner as in Example 13 to obtain a target resin composition pellet having a water content of 0.3% [EVOH (A) 100 parts of phosphoric acid. Compound (B) containing 0.012 parts in terms of phosphate group].
- Example 14 100 parts of the porous precipitate obtained in Example 14 was added to 300 parts of a 0.007% aqueous solution of calcium dihydrogen phosphate (B) (phosphoric acid was added to 100 parts of total water). The mixture was stirred at 30 ° C for 5 hours, and a resin composition pellet [EVOH (A) 100) comprising EVO H (A) and a phosphoric acid compound (B) was added. The content of the phosphoric acid compound (B) was 0.002 part in terms of phosphoric acid radical).
- the obtained resin composition pellet was dried in the same manner as in Example 14 to obtain a target resin composition pellet having a water content of 0.2% [EVOH (A) 100 parts.
- the phosphoric acid compound (B) contained 0.002 parts in terms of phosphate group].
- the drying treatment method was changed as follows, and the drying treatment was performed as follows, the desired resin composition pellet [EVOH (A) 100 parts by weight of the phosphoric acid compound ( B) was 0.011 part in terms of phosphoric acid radical].
- the obtained resin composition pellet was dried with nitrogen gas at 70 ° C. for about 5 hours using a batch box dryer (ventilation type) to obtain a resin composition pellet having a water content of 30%. Obtained.
- the moisture content of the resin composition pellet before standing drying was 50%, and the difference in moisture content between the resin composition pellet before and after standing drying was 20%.
- the resin composition pellet after the above-mentioned stationary drying treatment was dried for about 18 hours using a batch-type box dryer (ventilated) while flowing nitrogen gas at 120 ° C. for about 18 hours.
- a target resin composition pellet having a rate of 0.2% was obtained.
- Example 21 0.03 part of sodium dihydrogen phosphate was used in place of magnesium dihydrogen phosphate (B), and a phosphoric acid compound was added to 100 parts of EVOH (A).
- a resin composition pellet containing 0.009 parts of (B) in terms of a phosphate group before drying was obtained, and the target resin was prepared in the same manner except that the drying treatment was performed by changing the drying method as follows. A composition pellet was obtained.
- the obtained resin composition pellet was dried with nitrogen gas at 70 ° C. for about 5 hours using a batch box dryer (ventilation type) to obtain a resin composition pellet having a water content of 30%. Obtained.
- the water content of the resin composition pellet before standing drying was 50%, and the difference in water content between the resin composition pellet before and after standing drying was 20%.
- the resin composition pellet after the standing drying treatment was dried for about 18 hours while flowing nitrogen gas at 120 ° C using a batch-type box dryer (ventilated type) to obtain a water content. 0.2% of a target resin composition pellet [containing 0.009 part of a phosphoric acid compound (B) in terms of a phosphate group per 100 parts of EVOH (A)] was obtained.
- Example 2 5 100 parts of the porous precipitate obtained in Example 16 was put into 250 parts of a 0.06% aqueous solution of magnesium dihydrogen phosphate (B), and the mixture was stirred at 30 ° C for about 4 hours to obtain an EV.
- Pellet of resin composition comprising OH (A) and magnesium dihydrogen phosphate (B) [010 parts by weight of EVOH (A) containing 010 parts of phosphate compound (B) in terms of phosphate group] I got
- the obtained resin composition pellet was dried in the same manner as in Example 16 to obtain a resin composition pellet having a water content of 0.3% [EV OH (A) 100 parts by weight. 0.010 parts of an acid compound (B) in terms of a phosphate group].
- a resin composition pellet was prepared in the same manner as in Example 13 except that the water content of the porous precipitate of EVOH (A) was adjusted to 10%. (B) containing 0.044 parts in terms of boron], and then dried under the same conditions.
- the water content of the resin composition pellet after the fluidized drying treatment was 6%
- the resin composition pellet after the standing drying treatment [EVOH (A): 100 parts
- the boron compound (B) was 0.044 parts in terms of boron).
- the final moisture content was 0.1%.
- a resin composition pellet [EVOH (A) 1 was prepared in the same manner as in Example 13 except that the water content of the porous precipitate of the water-methanol solution after saponification of EVOH (A) was adjusted to 90%.
- the boron compound (B) was contained in an amount of D.011 part in terms of boron with respect to 100 parts, and then dried under the same conditions.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 30%, and the resin composition pellet after the stationary drying treatment [EV OH (A) 100 parts by weight of the boron compound (B ) In terms of boron) was 0.3%.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 20%, and the resin composition pellet after the stationary drying treatment [EV OH (A) Containing 0.0005 parts of the substance (B) in terms of boron)] was 0.3%.
- a resin composition pellet [EVOH (A) was used in Example 13 except that the amount of the boron compound (B) was adjusted to 1 part with respect to 100 parts of the total water. (B) containing 0.1 part in terms of boron], and then dried under the same conditions.
- the water content of the resin composition pellet after the fluidized drying treatment was 20%, and the resin composition pellet after the standing and drying treatment [EV OH (A) 100 parts by weight of the boron compound ( B) contained 0.1 part in terms of boron]].
- Example 17 In the same manner as in Example 17 except that the water content of the porous precipitate of EVOH (A) was adjusted to 10%, the resin composition velvet [Acetic acid was added to 100 parts of EVOH (A). Containing 0.01 part of salt (B) in terms of calcium], and then dried under the same conditions.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 6%
- the resin composition pellet after the standing drying treatment [EVOH (A): 100 parts by weight of acetate (B) Contained 0.01 part in terms of calcium] was 0.1%.
- a resin composition pellet [EVOH (A) was prepared in the same manner as in Example 17 except that the water content of the porous precipitate of the water / methanol solution after saponification of EVOH (A) was adjusted to 90%. 100 parts of acetate (B) containing 0.005 part in terms of calcium], and then dried under the same conditions.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 30%, and the resin composition pellet after the static drying treatment [EVOH (A) 100 parts by weight of acetate.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 20%
- the final water content of the resin composition pellet after drying (containing 0.0006 parts of acetate (B) in terms of calcium based on 100 parts of EVOH (A)) was 0.3%.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 20%, and the resin composition pellet after the standing drying treatment [EVOH (A) 100 parts of acetate (B ) In terms of calcium] was 0.3%.
- Example 21 a resin composition pellet [EVOH (A) 100 parts by weight of phosphoric acid was added except that the water content of the porous precipitate of EVOH (A) was adjusted to 10%.
- the compound (B) contained 0.024 parts in terms of phosphate group], and then dried under the same conditions.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 6%
- the resin composition pellet after the stationary drying treatment [EVOH (A) 100 parts by weight of the phosphoric acid compound ( B) was 0.024 parts in terms of phosphoric acid root]
- the final moisture content was 0.1%.
- a resin composition pellet [EVOH (A) was prepared in the same manner as in Example 21 except that the water content of the porous precipitate of the water / methanol solution after saponification of EVOH (A) was adjusted to 90%. ) 100 parts of a phosphoric acid compound (B) containing 0.002 parts in terms of a phosphate group], and then dried under the same conditions.
- the moisture content of the resin composition pellet after the fluidized drying treatment was 30%, and the resin composition pellet after the stationary drying treatment [EVOH (A): 100 parts by weight of the phosphoric acid compound ( B) contained 0.002 parts in terms of phosphoric acid radical].] was 0.3%.
- Example 21 In the same manner as in Example 21 except that the phosphoric acid compound (B) with respect to 100 parts by weight of total water was adjusted to Q.00005, the resin composition pellet [EVOH (A) was added to 100 parts by weight. After obtaining a solution containing 0.0001 part or less of the phosphate compound (B) in terms of a phosphate group, a drying treatment was performed under the same conditions. However, the moisture content of the resin composition pellet after the fluidized drying treatment was 20%, and the resin composition pellet after the standing drying treatment [EVOH (A) (B) containing 0.0001 parts or less in terms of phosphoric acid radicals] had a final moisture content of 0.3%.
- a resin composition pellet [EVOH (A) was added to 100 parts of EVOH (A) in the same manner as in Example 21 except that the phosphoric acid compound (B) was adjusted to 2 parts with respect to 100 parts of the total water. Containing 0.25 parts of the acid compound (B) in terms of phosphate group], and then dried under the same conditions.
- Example 3 (Table 3) Fish Long Run Eye Moldability Example 13 0 ⁇ Example 14 ⁇ ⁇ Example 15 0 ⁇ Example 16 0 ⁇ Example 17 0 ⁇ Example 18 ⁇ ⁇ Example 19 ⁇ Example 2 0 ⁇ ⁇ Example 2 10 ⁇ Example 2 20 ⁇ Example 2 3 0 ⁇ Example 2 4 ⁇ Example 2 5 ⁇ ⁇ ⁇ Comparative Example 9 X ⁇ Comparative Example 10 0 mm X Compare Example 1 1 ⁇ X Comparative Example 1 2 XX Comparative Example 1 3 X ⁇ Comparative Example 1 4 ⁇ X Comparative Example 1 5 ⁇ X Comparative Example 1 6 XX Comparative Example 1 ⁇ X ⁇ Comparative Example 1 Sum X Comparative Example 1 9 ⁇ X ratio door 2 0 XX Example 26
- a methanol / water (50/50 weight ratio) solution of EV 0 H [ethylene content 35 mol%, saponification degree 99.5 mol%] adjusted to a liquid temperature of 50 ° C is maintained at 5 ° C from the nozzle. It was extruded in a strand into the aquarium. After the coagulation is completed, the strand is cut with a cutter through a take-off roller attached to the end of the water tank to obtain a pellet (1) having a diameter of 4 mm and a length of 4 mm, and the pellet (1). 1) was poured into warm water at 30 ° C. and stirred for 4 hours to obtain an EV 0 H pellet (2) having a water content of 50%. Then, the pellet (2) was treated with a 0.2% boric acid aqueous solution. And stirred at 30 ° C. for 5 hours to obtain a pellet (3) having a water content of 50%. The boric acid content in the pellet (3) was E V O H
- the pellet (3) was converted into a dried pellet through the following primary drying step and secondary drying step.
- the pellet (4) was dried for 18 hours by passing through the surface of the pellet at a rate of 0.3 m / sec with nitrogen gas at 125 ° C by a batch-type air-flow box dryer. As a result, a dried pellet having a moisture content of 0.3% was obtained.
- the obtained dried pellet is supplied as an intermediate layer to a multilayer extruder equipped with a feed block 5-layer T-die, and polyethylene (“Novatec LDLF525H” manufactured by Mitsubishi Chemical Corporation) and adhesive resin (Mitsubishi Corporation) Polyethylene layer / adhesive resin layer EV0H layer Adhesive resin layer Polyethylene layer (thickness 50/10/20 / 10Z50 m) under the following conditions using “Modike AP24OH” manufactured by Chemical Co., Ltd.) ) was prepared and a fishy was measured and evaluated as follows. In addition, continuous operation was performed for 96 hours, and the torque fluctuation of the EVOH extruder and the film thickness change of the EVOH layer at that time were evaluated. (Extrusion conditions)
- the film was sampled every hour, the cross section in the MD direction was observed with a microscope, the thickness of the EVOH layer was measured, and the variation ratio was calculated with a center value of 20 wm, and evaluated as follows.
- Example 26 nitrogen gas was passed through the surface of the pellet (3) at a speed of 1.5 m / sec using a fluidized bed dryer (continuous horizontal multi-chamber type) as a dryer in the primary drying step.
- a pellet (4) having a water content of 22% was obtained in the same manner except for the above.
- the difference in water content before and after the first drying was 28%.
- the second drying step was also performed in the same manner as in Example 26 to obtain a dried pellet having a moisture content of 0.3%.
- the pellet (4) was passed through the pellet surface at a rate of 0.08 m / sec with nitrogen gas at 125 ° C using a batch-type rotary dryer.
- a dried pellet having a water content of 0.3% was obtained in the same manner except that the drying was performed.
- Example 26 the same treatment was performed using a 0.03% calcium acetate aqueous solution instead of the 0.2% boric acid aqueous solution.
- the calcium acetate content in the pellet before drying was 0.0075 parts (calculated as calcium) based on 100 parts of EVOH.
- the primary drying and the secondary drying were performed in the same manner as in Example 26 to obtain a dried pellet having a moisture content of D.3%.
- Example 26 the same treatment was performed using a 0.02% aqueous magnesium dihydrogen phosphate solution instead of the 0.2% boric acid aqueous solution.
- the content of magnesium dihydrogen phosphate in the pellet before drying was Q.018 parts (in terms of phosphate) with respect to 100 parts of EVOH.
- Example Primary drying and secondary drying were performed in the same manner as in Example 26 to obtain a dried pellet having a moisture content of 0.3%.
- a pellet (2) was obtained in the same manner as in Example 26.
- the primary and secondary drying were performed in the same manner as in Example 26 without performing boric acid treatment, and a dry pellet having a water content of 0.3% was obtained. Obtained.
- the pellet (2) was obtained in the same manner as in Example 26, the pellet (2) was poured into a 0.2% boric acid aqueous solution and stirred at 30 ° C for 5 hours to obtain a water content of 100 parts (EV (With respect to 0H100 part) (3).
- the boric acid content in the pellet (3) was 0.03 parts (in terms of boron) with respect to 100 parts of EVOH.
- the pellet (3) was converted into a dried pellet through the following primary drying step and secondary drying step.
- the mixture was dried with a nitrogen gas at 75 ° C. for 3 hours in a batch type fluidized bed dryer to obtain a pellet (4) having a water content of 25 parts (based on 100 parts of EVO H).
- the average drying speed at this time was 25 parts / hour (hr).
- Example 32 was repeated except that the drying temperature in the first drying step was changed to 85 ° C and the drying time was changed to 1.5 hours, and the average drying speed was changed to 50 parts Z hours (hr). A dry pellet was obtained in an amount of 0.3 part (based on 100 parts of EV0H).
- Example 32 In the secondary drying step of Example 32, the drying temperature was changed to 115 ° C, the drying time was changed to 28 hours, and the average drying speed was changed to 0.9 part hour (hr). A dry pellet having a water content of 0.3 part (based on 100 parts of EVO H) was obtained.
- Example 32 a 0.03% aqueous calcium acetate solution was used instead of the 0.2% aqueous boric acid solution. And treated similarly.
- the content of calcium acetate in the pellet before drying was 0.0075 parts (calculated as calcium) based on 100 parts of EVOH.
- Primary drying and secondary drying were performed in the same manner as in Example 32 to obtain a dried pellet.
- Example 32 the same treatment was performed using a 0.02% aqueous magnesium dihydrogen phosphate solution instead of the 0.2% boric acid aqueous solution.
- the content of magnesium dihydrogen phosphate in the pellet before drying was 0.018 parts (in terms of phosphate radical) with respect to 100 parts of EV0H100.
- Primary drying and secondary drying were performed in the same manner as in Example 32 to obtain a dried pellet.
- a pellet (2) was obtained in the same manner as in Example 32, and primary and secondary drying were performed in the same manner as in Example 1 without performing boric acid treatment, to obtain a dried pellet.
- Example 26 a pellet (4) having a water content of 40% was obtained in the same manner except that nitrogen gas was passed through the surface of the pellet (3) at a speed of 0.3 m / sec. Was. The difference in water content before and after the first drying was 10%.
- the second drying step was also performed in the same manner as in Example 26 to obtain a dried pellet having a water content of 0.6%.
- Example 26 a pellet (4) having a water content of 3.0% was obtained in the same manner except that nitrogen gas was passed through the pellet (3) at a speed of 15 m / sec. Was. The difference in water content before and after the first drying was 47%.
- the second drying step was performed in the same manner as in Example 26 to obtain a dried pellet having a water content of 0.1%.
- Example 26 a drying pellet having a water content of 0.1% was obtained at a passage speed of 2.0 m / sec in the second drying step.
- Example 32 In the primary drying process of Example 32, the drying was performed in the same manner except that the drying temperature was changed to 40 ° C and the drying time was changed to 25 hours to set the average drying speed to 3 parts / hour (hr). A dried pellet having a water content of 0.3 part (based on 100 parts of EVOH) was obtained.
- Example 32 In the same manner as in Example 32 except that in the first drying step, the drying temperature was changed to 125 ° C and the drying time was changed to 0.14 hours, and the average drying speed was changed to 550 hours (hr). Implement, hydrated A dry pellet was obtained in an amount of 0.1 part (relative to 100 parts of EVOH).
- Example 32 In the second drying step in Example 32, except that the drying temperature was changed to 88 ° C and the drying time was changed to 480 hours, and the average drying speed was changed to 0.05 parts / hour (hr), A dried pellet having a water content of 1 part (based on 100 parts of EVOH) was obtained.
- Example 3 In the secondary drying process in Example 2, the drying temperature was changed to 155 ° C, the drying time was changed to 4.5 hours, and the average drying speed was changed to 5.5 parts Z time (hr). Thus, a dried pellet having a water content of 0.25 parts (based on EV0H100 parts) was obtained.
- Table 4 shows the evaluation results of the dried pellets obtained in Examples 26 to 37 and Comparative Examples 21 to 27. In these Examples 26 to 37 and Comparative Examples 21 to 27, the weight ratio of coagulating liquid / strand was set to 800 in all cases.
- Comparative Example 27 XX Industrial Applicability
- the solution of EV0H is continuously extruded into a coagulating liquid in a strand form, and then the strand is cut to pellet.
- the weight ratio between the coagulation liquid and the EV0H strand was set to 50 to 10,000, so that the size was continuously and It is possible to manufacture EVOH pellets with excellent precision in melting, and the EVOH pellets in parentheses can be melt-molded. Are better.
- the EVOH pellets are excellent in melt moldability when formed into a multilayer laminate, there is no generation of fine fish shreds having a diameter of less than 0.1 when various types of laminates are formed, and food and It is very useful for applications such as films, sheets, tubes, bags, containers, and the like for packaging pharmaceuticals, agricultural chemicals, industrial chemicals, etc., and can be particularly suitably used for secondary processed products that require stretching.
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69824272T DE69824272T2 (de) | 1997-09-08 | 1998-09-07 | Verfahren zur herstellung von pellets aus verseiftem äthylen/vinylacetat copolymer |
US09/297,688 US6238606B1 (en) | 1997-09-08 | 1998-09-07 | Process for preparing pellets of saponified ethylene/vinyl acetate copolymer |
AU89989/98A AU746789B2 (en) | 1997-09-08 | 1998-09-07 | Process for preparing pellets of saponified ethylene/vinyl acetate copolymer |
EP98941750A EP0937557B1 (en) | 1997-09-08 | 1998-09-07 | Process for preparing pellets of saponified ethylene/vinyl acetate copolymer |
CA002270559A CA2270559C (en) | 1997-09-08 | 1998-09-07 | Method of producing saponified ethylene-vinyl acetate copolymer pellets |
Applications Claiming Priority (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9/260845 | 1997-09-08 | ||
JP9/260844 | 1997-09-08 | ||
JP26084497A JP4014119B2 (ja) | 1997-09-08 | 1997-09-08 | エチレン−酢酸ビニル共重合体ケン化物ペレットの製造法 |
JP26084597A JP4039531B2 (ja) | 1997-09-08 | 1997-09-08 | エチレン−酢酸ビニル共重合体ケン化物ペレットの製造法 |
JP27205897A JP4014120B2 (ja) | 1997-09-17 | 1997-09-17 | エチレン−酢酸ビニル共重合体ケン化物ペレットの製造法 |
JP9/272058 | 1997-09-17 | ||
JP10/39764 | 1998-02-04 | ||
JP03976498A JP4070161B2 (ja) | 1998-02-04 | 1998-02-04 | エチレン−酢酸ビニル共重合体ケン化物ペレットの製造法 |
JP11611198A JP3871437B2 (ja) | 1998-04-10 | 1998-04-10 | エチレン−酢酸ビニル共重合体ケン化物ペレットの乾燥方法 |
JP10/116110 | 1998-04-10 | ||
JP10/116111 | 1998-04-10 | ||
JP11611098A JP4107446B2 (ja) | 1998-04-10 | 1998-04-10 | エチレン−酢酸ビニル共重合体ケン化物ペレットの乾燥方法 |
JP15214898A JP4107447B2 (ja) | 1998-05-15 | 1998-05-15 | エチレン−酢酸ビニル共重合体ケン化物ペレットの乾燥方法 |
JP10/152148 | 1998-05-15 |
Publications (1)
Publication Number | Publication Date |
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WO1999012714A1 true WO1999012714A1 (fr) | 1999-03-18 |
Family
ID=27564497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/004007 WO1999012714A1 (fr) | 1997-09-08 | 1998-09-07 | Procede pour la preparation de pastilles de copolymere d'ethylene et d'acetate de vinyle saponifie |
Country Status (6)
Country | Link |
---|---|
US (1) | US6238606B1 (ja) |
EP (1) | EP0937557B1 (ja) |
AU (1) | AU746789B2 (ja) |
CA (1) | CA2270559C (ja) |
DE (1) | DE69824272T2 (ja) |
WO (1) | WO1999012714A1 (ja) |
Cited By (4)
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EP1072616A2 (en) * | 1999-07-23 | 2001-01-31 | Kuraray Co., Ltd. | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets |
US6238606B1 (en) * | 1997-09-08 | 2001-05-29 | Nippon Gohsei Kagaku Kogyo | Process for preparing pellets of saponified ethylene/vinyl acetate copolymer |
US6838029B2 (en) | 2001-01-19 | 2005-01-04 | Kuraray Co., Ltd. | Method for producing ethylene-vinyl alcohol copolymer resin |
CN102173006A (zh) * | 2011-03-14 | 2011-09-07 | 镇国广 | 超净无尘无静电聚乙烯绝缘料的生产方法 |
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ATE549373T1 (de) * | 1998-10-07 | 2012-03-15 | Kuraray Co | Mehrschichtige struktur und herstellungsverfahren dafür |
ATE479531T1 (de) * | 1999-06-25 | 2010-09-15 | Sumika Color Company Ltd | Mehrschichtige pellets und verfahren zur herstellung dieser mehrschichtigen pellets |
US6964990B2 (en) * | 1999-12-16 | 2005-11-15 | Kuraray Co., Ltd. | Ethylene-vinyl alcohol copolymer resin composition of improved long-run workability, and its shaped articles |
US6538064B2 (en) | 2000-06-06 | 2003-03-25 | Kuraray Co., Ltd. | Method for producing ethylene-vinyl alcohol copolymer resin composition |
GB2365434B (en) | 2000-08-07 | 2004-04-28 | Kuraray Co | Method for processing ethylene-vinyl alcohol copolymer solution |
ATE312851T1 (de) | 2000-08-07 | 2005-12-15 | Kuraray Co | Verfahren zur herstellung von wässrigen zusammensetzungen aus ethylen-vinylalkohol- copolymeren |
TW593350B (en) * | 2000-10-18 | 2004-06-21 | Kuraray Co | The method for preparing ethylene-vinylacetate copolymer as well as the saponification substance obtained by this way and the moldings containing it |
ITMI20012269A1 (it) * | 2001-10-29 | 2003-04-29 | Larderello Spa | Procedimento di produzione di un sale di boro e suo utilizzo in campoagronomico |
US20040043170A1 (en) * | 2002-06-24 | 2004-03-04 | The Procter & Gamble Company | Food package |
ATE525183T1 (de) | 2002-07-18 | 2011-10-15 | Kuraray Co | Verfahren zur herstellung von ethylen- vinylalkoholcopolymerpellets |
AU2003304223A1 (en) * | 2003-06-20 | 2005-01-04 | Chang Chun Petrochemical Co., Ltd. | Method for improve the handling heat resistance of the ethylene-vinyl alcohol copolymer |
JP4473856B2 (ja) * | 2004-03-31 | 2010-06-02 | 長春石油化學股▲分▼有限公司 | エチレン−ビニルアルコール共重合体ペレットの製造方法 |
CN101421097A (zh) * | 2006-04-14 | 2009-04-29 | 三菱树脂株式会社 | 阻气性叠层体 |
DE102011121143A1 (de) * | 2011-08-23 | 2013-02-28 | Huhtamaki Films Germany Gmbh & Co. Kg | Eine linear weiterreißbare Mehrschichtfolie |
US8795811B2 (en) | 2012-06-29 | 2014-08-05 | Toray Plastics (America), Inc. | Recycled crosslinked vinyl-alcohol polymer coated films and methods to manufacture the same |
JP6575059B2 (ja) * | 2013-12-24 | 2019-09-18 | 三菱ケミカル株式会社 | エチレン−ビニルエステル系共重合体ケン化物ペレット及びエチレン−ビニルエステル系共重合体ケン化物ペレットの製造方法 |
CN106146717B (zh) * | 2015-04-17 | 2021-07-30 | 中国石油化工集团有限公司 | 一种乙烯-乙烯醇共聚物的生产方法 |
CN105085722A (zh) * | 2015-08-12 | 2015-11-25 | 内蒙古蒙维科技有限公司 | 一种去除聚乙烯醇水溶液中杂质离子的方法 |
WO2019117118A1 (ja) | 2017-12-12 | 2019-06-20 | 株式会社クラレ | エチレン-ビニルアルコール共重合体水溶液 |
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- 1998-09-07 CA CA002270559A patent/CA2270559C/en not_active Expired - Lifetime
- 1998-09-07 AU AU89989/98A patent/AU746789B2/en not_active Expired
- 1998-09-07 WO PCT/JP1998/004007 patent/WO1999012714A1/ja active IP Right Grant
- 1998-09-07 EP EP98941750A patent/EP0937557B1/en not_active Expired - Lifetime
- 1998-09-07 US US09/297,688 patent/US6238606B1/en not_active Expired - Lifetime
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Cited By (8)
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US6238606B1 (en) * | 1997-09-08 | 2001-05-29 | Nippon Gohsei Kagaku Kogyo | Process for preparing pellets of saponified ethylene/vinyl acetate copolymer |
EP1072616A2 (en) * | 1999-07-23 | 2001-01-31 | Kuraray Co., Ltd. | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets |
EP1072616A3 (en) * | 1999-07-23 | 2001-10-04 | Kuraray Co., Ltd. | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets |
US6686405B1 (en) | 1999-07-23 | 2004-02-03 | Kuraray Co., Ltd. | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets |
KR100469043B1 (ko) * | 1999-07-23 | 2005-01-29 | 가부시키가이샤 구라레 | 에틸렌-비닐알콜 공중합체 수지와 펠릿의 제조방법 및수지 펠릿 |
US7323503B2 (en) | 1999-07-23 | 2008-01-29 | Kuraray Co., Ltd. | Process for producing ethylene-vinyl alcohol copolymer resin, process for producing pellets and resin pellets |
US6838029B2 (en) | 2001-01-19 | 2005-01-04 | Kuraray Co., Ltd. | Method for producing ethylene-vinyl alcohol copolymer resin |
CN102173006A (zh) * | 2011-03-14 | 2011-09-07 | 镇国广 | 超净无尘无静电聚乙烯绝缘料的生产方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0937557A1 (en) | 1999-08-25 |
CA2270559A1 (en) | 1999-03-18 |
AU746789B2 (en) | 2002-05-02 |
CA2270559C (en) | 2004-03-30 |
EP0937557A4 (en) | 2003-01-29 |
DE69824272D1 (de) | 2004-07-08 |
AU8998998A (en) | 1999-03-29 |
US6238606B1 (en) | 2001-05-29 |
EP0937557B1 (en) | 2004-06-02 |
DE69824272T2 (de) | 2005-07-07 |
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