Ethylene-vinyl alcohol copolymer, method for producing same, and use thereof
US-2021108111-A1 · Apr 15, 2021 · US
Coating agent for paper and coated paper using same
US12247355B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12247355-B2 |
| Application number | US-202017769529-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 15, 2020 |
| Priority date | Oct 16, 2019 |
| Publication date | Mar 11, 2025 |
| Grant date | Mar 11, 2025 |
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Abstract
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A coating agent for paper comprises: an ethylene-vinyl alcohol copolymer, wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 1 mol % or more and less than 20 mol % and a block character of the ethylene units from 0.90 to 0.99. Coated paper is obtained by coating paper with such a coating agent. The coating agent of the present invention is excellent in viscosity stability and also causes the resulting coated paper to be excellent in barrier properties and water resistance.
First claim
Opening claim text (preview).
The invention claimed is: 1. A coating agent for paper comprising: an ethylene-vinyl alcohol copolymer, wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 1 mol % or more and less than 20 mol % and a block character of the ethylene units from 0.90 to 0.99. 2. The coating agent for paper according to claim 1 , further comprising from 0.000001 to 0.01 parts by mass of a compound with a molecular weight of 1000 or less having a conjugated double bond based on 100 parts by mass of the ethylene-vinyl alcohol copolymer. 3. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a degree of saponification from 80 to 99.7 mol %. 4. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization from 300 to 5000. 5. The coating agent for paper according to claim 1 , further comprising an ionomer. 6. Coated paper obtained by coating paper with the coating agent according to claim 1 . 7. The coated paper according to claim 6 , wherein the coated paper is base paper for release paper. 8. The coated paper according to claim 6 , wherein the coated paper is greaseproof paper. 9. The coating agent for paper of claim 1 , wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 1.5 mol % or more. 10. The coating agent for paper of claim 1 , wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 2.5 mol % or more. 11. The coating agent for paper of claim 1 , wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 20 mol % or less. 12. The coating agent for paper of claim 1 , wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 10 mol % or less. 13. The coating agent for paper of claim 1 , wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 8.5 mol % or less. 14. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization of 500 or more. 15. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization of 900 or more. 16. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization of 4000 or less. 17. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization of 3500 or less. 18. The coating agent for paper according to claim 1 , wherein the ethylene-vinyl alcohol copolymer has a viscosity-average degree of polymerization of 2400 or less. 19. A method of producing coated paper, the method comprising coating paper with the coating agent according claim 1 . 20. A method of producing coated paper, the method comprising coating paper with the coating agent according to claim 2 .
Assignees
Inventors
Classifications
Release paper · CPC title
Sizing or water-repelling agents · CPC title
Modified block copolymers · CPC title
Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title
Chemical modification of a polymer · CPC title
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- What does patent US12247355B2 cover?
- A coating agent for paper comprises: an ethylene-vinyl alcohol copolymer, wherein the ethylene-vinyl alcohol copolymer has a content of ethylene units of 1 mol % or more and less than 20 mol % and a block character of the ethylene units from 0.90 to 0.99. Coated paper is obtained by coating paper with such a coating agent. The coating agent of the present invention is excellent in viscosity sta…
- Who is the assignee on this patent?
- Kuraray Co
- What technology area does this patent fall under?
- Primary CPC classification C09D7/63. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 11 2025 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).