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.

发明人： KATAHIRA, Eriko ,  KIDA, Noriyuki ,  SHIOTA, Hirotaka

IPC分类号： C08J3/20 ,  C08K5/09 ,  C08K5/098 ,  C08L29/04 ,  C08K3/32 ,  C08K3/38

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.

公开(公告)号：EP3597701A1

公开(公告)日：2020-01-22

申请号：EP18767519.4

申请日：2018-03-14

申请人： Kuraray Co., Ltd.

发明人： KATAHIRA, Eriko ,  SHIMO, Hiroyuki ,  NAKANO, Kenji

IPC分类号： C08L29/04 ,  B32B27/28 ,  C08K5/06 ,  C08K5/103 ,  C08K5/17 ,  C08K5/20

摘要： There is provided a resin composition, comprising an ethylene-vinyl alcohol copolymer and a nonionic surfactant, wherein the ethylene-vinyl alcohol copolymer has an ethylene unit content of 15 to 60 mol%, and a saponification degree of 90 mol% or more; the ethylene-vinyl alcohol copolymer is contained as a major component; and the nonionic surfactant is contained at 3 to 400 ppm. The resin composition is produced by melt-kneading a mixture comprising the nonionic surfactant, water and the ethylene-vinyl alcohol copolymer. By using the resin composition thus produced, a discharge amount during melt molding can be increased and a molded article with an excellent appearance can be provided.