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公开(公告)号：EP4269475A1
公开(公告)日：2023-11-01
申请号：EP21910997.2
申请日：2021-12-23
申请人： Kuraray Co., Ltd.
摘要： A method of producing an ethylene-vinyl alcohol copolymer resin composition comprises feeding water-containing pellets of an ethylene-vinyl alcohol copolymer from 0°C to 80°C and an additive to an extruder (X) for melt kneading, wherein the additive includes at least one selected from the group consisting of carboxylic acid, a boron compound, a phosphoric acid compound, an alkali metal salt, and an alkaline earth metal salt, the additive is added to the ethylene-vinyl alcohol copolymer in the extruder (X), a melt in the extruder (X) has a temperature T 0 from 70°C to 180°C and the extruder (X) has a cylinder temperature T 1 from 65°C to 175°C, T 0 and T 1 satisfy an expression (1) below 5 ≤ T 0 -T 1 ≤ 100(1), and the water-containing pellets fed to the extruder (X) has a water content from 20 to 60 mass% and a water-containing resin composition immediately after extrusion from the extruder (X) has a water content from 10 to 35 mass%. The production method allows, in the method comprising melt kneading the water-containing ethylene-vinyl alcohol copolymer pellets and the minor component in the extruder, followed by extrusion, highly efficient dewatering of the water-containing ethylene-vinyl alcohol copolymer pellets and also causes the EVOH resin composition thus obtained that has less foam and has a good hue.
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公开(公告)号：EP3564307A1
公开(公告)日：2019-11-06
申请号：EP17888903.6
申请日：2017-12-28
申请人： Kuraray Co., Ltd.
摘要： A resin composition comprises: a modified EVOH (A) that is represented by a following formula (I), has contents (mol%) of a, b, and c based on the total monomer units satisfying following formulae (1) through (3), and has a degree of saponification (DS) defined by a following formula (4) of 90 mol% or more; and inorganic oxide particles (B), wherein a content of the inorganic oxide particles (B) is from 5 to 5000 ppm. Such a resin composition is improved in adhesion to a resin other than EVOH, secondary processability, and flexibility without decreasing the performances originally possessed by EVOH, such as gas barrier properties, transparency, flavor retention, solvent resistance, and oil resistance. Accordingly, the resin is preferably used as a molded article, a film, a sheet, a heat shrinkable film, a thermoformed article, a multilayer structure, a coinjection stretch blow molded container, a fuel container, and the like.
18 ≤ a ≤ 55 0.01 ≤ c ≤ 20 100 − a + c × 0.9 ≤ b ≤ 100 − a + c DS = Total Number of Moles of Hydrogen Atoms in X , Y , and Z / Total Number of Moles of X , Y , and Z × 100-
公开(公告)号：EP4269473A1
公开(公告)日：2023-11-01
申请号：EP21910996.4
申请日：2021-12-23
申请人： Kuraray Co., Ltd.
发明人： SHIOTA, Hirotaka
IPC分类号： C08J3/12
摘要： A method of producing water-containing EVOH pellets comprises: a first step of introducing a water-containing EVOH with a water content W1 from 10 to 90 mass% and at a temperature from 80°C to 130°C into an extruder for melt kneading; and a second step of cutting the water-containing EVOH extruded from the extruder for obtaining water-containing EVOH pellets, wherein the extruder has a back slit and water is discharged from the back slit, the water-containing EVOH is extruded from the extruder at a temperature from 80°C to 120°C, the water-containing EVOH extruded from the extruder has a water content W2 from 5 to 50 mass%, and a ratio (W2/W1) of the water content W2 to the water content W1 is 0.2 or more and less than 1. The production method allows efficient reduction of water in the water-containing EVOH while inhibiting elution of the EVOH and thus allows efficient production of water-containing EVOH pellets, and also provides high drying efficiency and thus allows inhibiting degradation due to heat of dried EVOH pellets to be obtained.
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