Molding material of saponified ethylene-vinyl ester-based copolymer
AssigneeMitsubishi Chemical Corporation
InventorShintaro USUI
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Abstract
Provided is a melt-molding material which is produced using an EVOH resin and has improved feeding property. A pellet mixture comprising a first EVOH resin pellets (pellet 1) each having approximately circular or elliptical cross-section and having an ethylene unit content of 20 to 34 mol %, and a second EVOH resin pellets (pellet 2) each having ethylene unit content of 35 to 60 mol %, wherein the difference of ethylene unit content between the pellet 1 and the pellet 2 is from 10 to 30 mol %.
Claims6
A molding material comprising saponified ethylene-vinyl ester-based copolymer pellets,
- said saponified ethylene-vinyl ester-based copolymer pellets being each of which has approximately circular or elliptical cross-section having a ratio of major axis to minor axis ranging from 1.0 to 1.5;
- said saponified ethylene-vinyl ester-based copolymer pellets being a pellet mixture comprising a first saponified ethylene-vinyl ester-based copolymer pellet (pellet 1) having an ethylene unit content of 20 to 34 mol %, and a second saponified ethylene-vinyl ester-based copolymer pellet (pellet 2) having an ethylene unit content of 35 to 60 mol %;
- the difference in ethylene unit content between the first and second saponified ethylene-vinyl ester-based copolymer pellets being from 10 to 30 mol %;
- the first and second saponified ethylene-vinyl ester-based copolymer pellets each having a saponification degree of more than 99 mol % to 100 mol %;
- and
- a ratio (pellet 1/pellet 2) in weight of content in said pellets of molding material of the first saponified ethylene-vinyl ester-based copolymer pellet (pellet 1) to the second saponified ethylene-vinyl ester-based copolymer pellet (pellet 2) being in the range of 95/5 to 50/50.
A method of preparing a saponified ethylene-vinyl ester-based copolymer pellet composition for melt extrusion molding thereof, comprising
- feeding a pellet mixture of a first saponified ethylene-vinyl ester copolymer pellet (pellet 1) and a second saponified ethylene-vinyl ester copolymer pellet (pellet 2) into a screw extruder,
- wherein the pellet 1 has an ethylene unit content of 20 to 34 mol % and is approximate circle or ellipse in cross-section having a ratio (m/n) of major axis (m) to minor axis (n) ranging from 1.0 to 1.5, and the pellet 2 has an ethylene unit content of 35 to 60 mol % and is approximate circle or ellipse in cross-section having a ratio (m′/n′) of major axis (m′) to minor axis (n′) ranging from 1.0 to 1.5, and they differ in their ethylene unit content by 10 to 30 mol %, and the first and second saponified ethylene-vinyl ester-based copolymer pellets having a saponification degree of more than 99 mol % to 100 mol %, and a ratio (pellet 1/pellet 2) in weight of content in said pellets of molding material of the first saponified ethylene-vinyl ester-based copolymer pellet (pellet 1) to the second saponified ethylene-vinyl ester-based copolymer pellet (pellet 2) is in the range of 95/5 to 50/50;
- and
- melting the pellet composition, and extruding the melted composition from the extruder.
Dependencies are inferred from the claim text.