Invention Grant
- Patent Title: Ethylene vinyl alcohol copolymer pellet, method for extrusion of the pellet and extrusion molded film produced thereby
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Application No.: US16029063Application Date: 2018-07-06
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Publication No.: US10717796B2Publication Date: 2020-07-21
- Inventor: Huan Ming Chang , Weng Shing Lin , Chih Chieh Liang , Chia Hao Hsu
- Applicant: CHANG CHUN PETROCHEMICAL CO., LTD.
- Applicant Address: TW Taipei
- Assignee: CHANG CHUN PETROCHEMICAL CO., LTD.
- Current Assignee: CHANG CHUN PETROCHEMICAL CO., LTD.
- Current Assignee Address: TW Taipei
- Agency: Nixon Peabody LLP
- Agent Thomas P. Pavelko
- Main IPC: C08F216/06
- IPC: C08F216/06 ; C08J5/18 ; B32B27/08 ; B32B27/30 ; B29B9/06 ; B29K23/00

Abstract:
Extruded films comprising ethylene vinyl alcohol copolymer (EVOH) with substantially no blow holes therein, are formed by using a pellet feed to the extruder wherein 90-100 wt. % of the pellets pass through an ASTM size 5 sieve and 0-10 wt. % of the pellets are finer than a number 10 mesh (ASTM Sieve size). Uniform feeding to and through the extruder with a lack of bridging of the EVOH pellet feed have been observed.
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