Ethylene-vinyl alcohol copolymer resin particle composition, ethylene-vinyl alcohol copolymer film formed therefrom, and multilayer structure

Patent metadata

Field	Value
Publication number	US-12305033-B2
Application number	US-202218571181-A
Country	US
Kind code	B2
Filing date	Jun 16, 2022
Priority date	Jun 16, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

An ethylene-vinyl alcohol copolymer (EVOH) resin particle composition, an EVOH film formed therefrom, and a multilayer structure containing the same. The EVOH resin particle composition includes: a first EVOH resin particle having a peak material volume (Vmp) of 0.00001˜6 μm 3 /μm 2 ; and a second EVOH resin particle having a peak material volume (Vmp) of 0.00015˜20 μm 3 /μm 2 . This can improve the workability and mechanical properties of the EVOH composition when it is made into a film.

First claim

What is claimed is:

1. An ethylene-vinyl alcohol copolymer (EVOH) resin particle composition, comprising:
a first EVOH resin particle having a surface peak material volume (Vmp) of 0.00001˜6 μm 3 /μm 2 ; and
a second EVOH resin particle having a surface peak material volume (Vmp) of 0.00015˜20 μm 3 /μm 2 ,
wherein the first EVOH resin particle has an ethylene content of 36˜50 mole %,
wherein the second EVOH resin particle has an ethylene content of 20˜35 mole %, and
wherein the second EVOH resin particle has a greater Vmp than the first EVOH resin particle.

2. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a melting point of 135˜179° C., and the second EVOH resin particle has a melting point of 180˜198° C.

3. The EVOH resin particle composition of claim 1 , wherein the EVOH resin particle is cylindrical, elliptic cylindrical, prismoidal, spherical, ellipsoidal or biconvex-disk-shaped and has a major axis/height of 1˜5 mm and a minor axis of 1˜5 mm.

4. The EVOH resin particle composition of claim 1 , which has a ratio of the first EVOH resin particle to the second EVOH resin particle by weight percentage ranges from 5:95 to 75:25.

5. The EVOH resin particle composition of claim 1 , wherein the EVOH resin particle composition has a boron content of 5˜550 ppm.

6. The EVOH resin particle composition of claim 1 , wherein the EVOH resin particle composition has an alkali metal content of 10˜550 ppm.

7. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a kurtosis (Sku) surface parameter of 0.0020˜25, and the second EVOH resin particle has a kurtosis (Sku) surface parameter of 0.0070˜111.

8. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a maximum peak height (Sp) surface parameter of 0.0005˜29 μm, and the second EVOH resin particle has a maximum peak height (Sp) surface parameter of 0.0020˜63 μm.

9. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a protruding peak portion height (Spk) surface parameter of 0.001˜2 μm, and the second EVOH resin particle has a protruding peak portion height (Spk) surface parameter of 0.003˜22 μm.

10. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a peak extreme height (Sxp) surface parameter of 0.001˜12 μm, and the second EVOH resin particle has a peak extreme height (Sxp) surface parameter of 0.002˜48 μm.

11. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a linear arithmetic mean height (Ra) surface parameter of 0.001˜0.990 μm, and the second EVOH resin particle has a linear arithmetic mean height (Ra) surface parameter of 0.001˜0.990 μm.

12. The EVOH resin particle composition of claim 1 , wherein the first EVOH resin particle has a linear maximum height (Rz) surface parameter of 0.0010˜9.9000 μm, and the second EVOH resin particle has a linear maximum height (Rz) surface parameter of 0.0010˜9.9000 μm.

13. An ethylene-vinyl alcohol copolymer film formed from the EVOH resin particle composition of claim 1 .

14. A multilayer structure, comprising:
(a) at least one layer of the ethylene-vinyl alcohol copolymer film formed from the EVOH resin particle composition of claim 1 ;
(b) at least one layer of a polymer layer; and
(c) at least one layer of a binding layer.

15. The multilayer structure of claim 14 , wherein the polymer layer is one selected from the group consisting of a low-density polyethylene layer, polyethylene grafted maleic anhydride layer, polypropylene layer and nylon layer, and the binding layer is a tie layer.

16. The multilayer structure of claim 14 , wherein the multilayer structure is a polymer layer/binding layer/ethylene-vinyl alcohol copolymer film/binding layer/polymer layer.

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Liang Chih Chieh
• Lin Wen Hsin

Classifications

• C08L2203/16

  used for films · CPC title

• C08L23/0846

  with unsaturated hydrocarbons containing atoms other than carbon or hydrogen · CPC title

• C08L2205/14

  containing polymeric additives characterised by shape · CPC title

• B32B2307/738

  Thermoformability · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title