Method for producing ethylene-vinyl ester copolymer, and saponified ethylene-vinyl ester copolymer product
US-2017037168-A1 · Feb 9, 2017 · US
Ethylene vinyl alcohol copolymer pellet, method for extrusion of the pellet and extrusion molded film produced thereby
US10717796B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10717796-B2 |
| Application number | US-201816029063-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 6, 2018 |
| Priority date | Jul 6, 2018 |
| Publication date | Jul 21, 2020 |
| Grant date | Jul 21, 2020 |
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Abstract
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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.
First claim
Opening claim text (preview).
We claim: 1. Ethylene vinyl alcohol copolymer (EVOH) pellets exhibiting a particle size distribution of 90-100 wt. % of the pellets in the range of 5-10 mesh (ASTM E11 sieve size), and 0-10 wt. % of the pellets finer than number 10 mesh (ASTM E11 sieve size); wherein the EVOH pellets have an ethylene content in a range of 24-48 mole %, an hydrolysis of the ethylene vinyl alcohol copolymer of at least 95 mole %, and exhibit an angle of repose in the range of 20 to 30 degrees. 2. The EVOH pellets of claim 1 , wherein the pellets exhibit a bulk density of at least 0.7458 g/ml. 3. An extrusion molded EVOH film, comprising at least one layer, wherein at least one layer comprises a film formed from extruding the EVOH pellets of claim 1 . 4. The extrusion molded EVOH film of claim 3 , further comprising at least one other layer, said at least one other layer selected from the group consisting of polyethylene, polyethylene-graft-maleic-anhydride, nylon, and polypropylene and tie resin to be coextruded with the EVOH film; wherein the tie resin is a resin known to bond dissimilar polymers together. 5. The extrusion molded EVOH film of claim 3 , which exhibits substantially no blow holes. 6. Ethylene vinyl alcohol copolymer (EVOH) pellets, wherein the EVOH pellets exhibit a particle size distribution consisting of 90-100 wt. % of the pellets in the range of 5-10 mesh (ASTM E11 sieve size), and 0-10 wt. % of the pellets finer than number 10 mesh (ASTM E11 sieve size); wherein the EVOH pellets have an ethylene content in the range of 24-48 mole %, an hydrolysis of the ethylene vinyl alcohol copolymer of at least 95 mole %, an angle of repose in the range of 20-30 degrees; and a bulk density in the range of 0.7-0.8 g/ml. 7. An extrusion molded film comprising EVOH formed by extruding the pellets of claim 6 .
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Classifications
bi-axially · CPC title
mono-axially · CPC title
All layers being polymeric · CPC title
5 or more layers · CPC title
Food packaging · CPC title
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- What does patent US10717796B2 cover?
- 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 f…
- Who is the assignee on this patent?
- Chang Chun Petrochemical Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C08F216/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 21 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).