Ethylene-vinyl alcohol copolymer and process for producing said ethylene-vinyl alcohol copolymer
US-2019100610-A1 · Apr 4, 2019 · US
Ethylene-vinyl alcohol copolymer pellets, resin composition, and multilayer structure
US11292860B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11292860-B2 |
| Application number | US-201916434554-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 7, 2019 |
| Priority date | Dec 20, 2016 |
| Publication date | Apr 5, 2022 |
| Grant date | Apr 5, 2022 |
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Abstract
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Ethylene-vinyl alcohol copolymer pellets comprise an ethylene-vinyl alcohol copolymer and water, and have a water content of not higher than 0.5 wt. %, wherein the ratio (Y/Z) of a lactone ring content (Y) to the sum (Z) of a carboxylic acid content (X) and the lactone ring content (Y) in terminal structures of the ethylene-vinyl alcohol copolymer is not less than 60 mol %. The pellets are excellent in high-temperature thermal decomposition-suppressing effect and thermal stability, and are free from odor emanation and coloration even if being processed at a higher temperature.
First claim
Opening claim text (preview).
The invention claimed is: 1. Ethylene-vinyl alcohol copolymer pellets comprising: an ethylene-vinyl alcohol copolymer; and water; wherein the ethylene-vinyl alcohol copolymer comprises monomer units including at least an ethylene unit and a vinyl alcohol unit, and a carboxylic acid group and a lactone ring present in terminal structures of the ethylene-vinyl alcohol copolymer; wherein a ratio (Y/Z) of a lactone ring content (Y) to a sum (Z) of a carboxylic acid content (X) and the lactone ring content (Y) is not less than 60% in molar ratio; and wherein the pellets have a water content of not higher than 0.5 wt. %. 2. The ethylene-vinyl alcohol copolymer pellets according to claim 1 , wherein the sum (Z) of the carboxylic acid content (X) and the lactone ring content (Y) is 0.01 to 0.3 mol % based on a total amount of the monomer units of the ethylene-vinyl alcohol copolymer. 3. The ethylene-vinyl alcohol copolymer pellets according to claim 1 , wherein the lactone ring content (Y) is 0.01 to 0.3 mol % based on the total amount of the monomer units of the ethylene-vinyl alcohol copolymer. 4. The ethylene-vinyl alcohol copolymer pellets according to claim 1 , wherein the carboxylic acid content (X) is 0.01 to 0.3 mol % based on the total amount of the monomer units of the ethylene-vinyl alcohol copolymer. 5. A resin composition comprising a resin of the ethylene-vinyl alcohol copolymer pellets according to claim 1 . 6. A multilayer structure comprising a plurality of layers at least one of which comprises a resin of the ethylene-vinyl alcohol copolymer pellets according to claim 1 .
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Classifications
Powdering or granulating · CPC title
Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title
comprising synthetic resins not wholly covered by any one of the sub-groups {B32B27/30 - B32B27/42} · CPC title
in the form of filamentary material, e.g. combined with extrusion · CPC title
Auxiliary treatment of granules · CPC title
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- What does patent US11292860B2 cover?
- Ethylene-vinyl alcohol copolymer pellets comprise an ethylene-vinyl alcohol copolymer and water, and have a water content of not higher than 0.5 wt. %, wherein the ratio (Y/Z) of a lactone ring content (Y) to the sum (Z) of a carboxylic acid content (X) and the lactone ring content (Y) in terminal structures of the ethylene-vinyl alcohol copolymer is not less than 60 mol %. The pellets are exce…
- Who is the assignee on this patent?
- Mitsubishi Chem Corp
- 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 Apr 05 2022 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).