Saponified ethylene-vinyl ester copolymer pellet and method for producing same
US-2018319965-A1 · Nov 8, 2018 · US
Ethylene-vinyl alcohol copolymer composition, melt-forming material, multilayer structure, and container thermoforming material
US11161972B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11161972-B2 |
| Application number | US-202016823386-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 19, 2020 |
| Priority date | Nov 22, 2017 |
| Publication date | Nov 2, 2021 |
| Grant date | Nov 2, 2021 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A thermoformable ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer comprising two or more ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and (B) a sorbic acid ester; wherein the sorbic acid ester (B) is present in an amount of 0.00001 to 10 ppm based on the weight of the ethylene-vinyl alcohol copolymer composition. The ethylene-vinyl alcohol copolymer composition is excellent in coloration-suppressing effect.
First claim
Opening claim text (preview).
The invention claimed is: 1. An ethylene-vinyl alcohol copolymer composition comprising: (A) an ethylene-vinyl alcohol copolymer comprising two or more ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and (B) at least one sorbic acid ester selected from the group consisting of methyl sorbate and ethyl sorbate; wherein the at least one sorbic acid ester (B) is present in an amount of 0.00001 to 10 ppm based on a weight of the ethylene-vinyl alcohol copolymer composition. 2. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein a difference in ethylene structural unit content between: an ethylene-vinyl alcohol copolymer having a highest ethylene structural unit content, and an ethylene-vinyl alcohol copolymer having a lowest ethylene structural unit content in the ethylene-vinyl alcohol copolymer (A) is not less than 2 mol %. 3. The ethylene-vinyl alcohol copolymer composition according to claim 1 , wherein the ethylene-vinyl alcohol copolymer (A) comprises: (A1) an ethylene-vinyl alcohol copolymer having an ethylene structural unit content of less than 35 mol %; and (A2) an ethylene-vinyl alcohol copolymer having an ethylene structural unit content of not less than 35 mol %. 4. The ethylene-vinyl alcohol copolymer composition according to claim 3 , wherein the ethylene-vinyl alcohol copolymer (A1) having an ethylene structural unit content of less than 35 mol % and the ethylene-vinyl alcohol copolymer (A2) having an ethylene structural unit content of not less than 35 mol % are present in a weight ratio (A1)/(A2) of 1/99 to 99/1. 5. A melt-forming material comprising the ethylene-vinyl alcohol copolymer composition according to claim 1 . 6. A multilayer structure comprising a layer that comprises the ethylene-vinyl alcohol copolymer composition according to claim 1 . 7. A container thermoforming material comprising the multilayer structure according to claim 6 .
Assignees
Inventors
Classifications
3 layers · CPC title
comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title
used for thermoforming · CPC title
Thermoformability · CPC title
2 layers · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11161972B2 cover?
- A thermoformable ethylene-vinyl alcohol copolymer composition contains: (A) an ethylene-vinyl alcohol copolymer comprising two or more ethylene-vinyl alcohol copolymers having different ethylene structural unit contents; and (B) a sorbic acid ester; wherein the sorbic acid ester (B) is present in an amount of 0.00001 to 10 ppm based on the weight of the ethylene-vinyl alcohol copolymer composit…
- Who is the assignee on this patent?
- Mitsubishi Chem Corp
- What technology area does this patent fall under?
- Primary CPC classification C08L29/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 02 2021 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).