IP Library › Granted Patent US 12,503,538
Granted Patent B2
US 12,503,538 · App. 16/294,397 · Granted Dec 23, 2025

Molding material comprising a group of saponified ethylene-vinyl ester-based copolymer pellets and molding method using same

Inventors: Daichi Nishimura (Osaka, JP); Makoto Hatanaka (Osaka, JP); Shintaro Usui (Osaka, JP)
Assignee: MITSUBISHI CHEMICAL CORPORATION
C08F216/06B29B9/12B29B9/16B29C48/022B29C48/08B29C48/144B29C48/288C08J3/12B29B9/06B29B9/065B29K2031/00B29K2105/251C08F2500/24C08F2800/10
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Quick Facts
Patent No.
US 12,503,538
App. No.
16/294,397
Granted
Dec 23, 2025
Kind
B2
Abstract

A molding material comprising a pellet group of at least 20 saponified ethylene-vinyl ester-based copolymer pellets, wherein at least 95% of the pellets have a surface that is substantially a single closed surface, and when a maximum outer diameter of a pellet is taken as a long diameter and a minimum diameter in a cross section having the greatest area among the cross sections perpendicular to the long diameter is taken as a short diameter, the average value of the long diameter/short diameter ratio of at least 20 pellets taken from the pellet group is 1.6 or less and the standard deviation of the long diameter/short diameter ratio of the at least 20 pellets is 0.13 or less.

Claims (6)

1 . A method of molding a molded article comprising:

feeding a molding material comprising a pellet group of at least 20 saponified ethylene-vinyl ester-based copolymer pellets an extruder wherein,

the rotational speed of a screw in the extruder is 10 to 100 rpm,

at least 95% of the pellets have a surface that is substantially a single closed surface; and

when a maximum outer diameter of a pellet is taken as a long diameter and a minimum diameter in a cross section having the greatest area among cross sections perpendicular to the long diameter is taken as a short diameter, the average value of the long diameter/short diameter ratio of at least 20 pellets taken from the pellet group is 1.6 or less and the standard deviation of the long diameter/short diameter ratio of the at least 20 pellets is 0.13 or less, and

the at least 95% of the pellets have an oval cross section perpendicular to the long diameter.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 2, 2019
From: NISHIMURA, DAICHI; HATANAKA, MAKOTO; USUI, SHINTARO
To: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
Reel/Frame 049063/0688 →
MERGER Recorded May 2, 2019
From: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
To: MITSUBISHI CHEMICAL CORPORATION
Reel/Frame 049110/0285 →
Priority Claims (1)
JP 2016-174873 · Sep 7, 2016 · national
Continuity (2)
Continuation PCTJP2017030788 · Aug 28, 2017
Related Publication 20190202952A1 · Jul 4, 2019
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