Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Aqueous ethylene/vinyl alcohol copolymer dispersion

一种水性分散液、类共聚物的技术，应用在分层产品、涂层、合成树脂层状产品等方向，能够解决操作环境恶化、气体阻隔性差、难以使用等问题

Active Publication Date: 2007-10-31
SUMITOMO SEIKA CHEM CO LTD +1
View PDF7 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the EVOH solution has problems such as the following: if the concentration of EVOH solid content increases, the viscosity increases and it is difficult to handle; since the solution is an organic solvent such as dimethyl sulfoxide or a mixed solvent of alcohol and water, it is difficult to handle during the film formation process. The volatilization of the organic solvent causes deterioration of the operating environment; and the need for a device for recovering the organic solvent is economically disadvantageous
However, when drying at a low temperature or for a short time, or when coating a thick film with a thickness of 10 μm or more, for example, a large number of cracks may occur on the surface of the coating film, and the gas barrier property is poor, so it is required to improve the film-forming property

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] In 100 parts by weight of ethylene / acrylic acid copolymer (acrylic acid content 21% by weight, weight average molecular weight 41000), add 314 parts by weight of water and 12 parts by weight of sodium hydroxide equivalent to neutralization of 100 mol% of acrylic acid, and use Dissolution was carried out for 4 hours to obtain an ethylene / acrylic acid copolymer neutralized aqueous solution having a solid content concentration of 25% by weight.

[0076] 100 parts by weight of ethylene / vinyl acetate copolymer saponified product (32 mol % ethylene content, 99.5 mol % saponification degree, 1000 degree of polymerization), 855 parts by weight of isopropanol, 1045 parts by weight of water and the ethylene / acrylic acid obtained above The copolymer was mixed with 8 parts by weight of the aqueous solution, heated and dissolved at 80°C, and cooled to 5°C while stirring to precipitate and disperse the particles. Then, isopropanol was distilled off to obtain an aqueous dispersion of ...

Embodiment 2

[0080] With ethylene / vinyl acetate copolymer saponified product (ethylene content 29 mol%, saponification degree 99.5 mol%, polymerization degree 1000) 100 weight parts, isopropanol 855 weight parts, water 1045 weight parts and embodiment 1 The ethylene / acrylic acid copolymer was mixed with 8 parts by weight of the aqueous solution, heated and dissolved at 80°C, and cooled to 5°C with stirring to precipitate and disperse the particles. Then, isopropanol was distilled off to obtain an aqueous dispersion of an ethylene / vinyl acetate copolymer saponified product having an average particle diameter of 0.18 μm and a solid content concentration of 29% by weight.

[0081] On the other hand, 2125 parts by weight of water was added to 375 parts by weight of polyvinyl alcohol (saponification degree 99.0 mol%, polymerization degree 300), heated and dissolved at 95°C, and cooled to room temperature to obtain polyethylene with a solid content concentration of 15% by weight. alcohol solutio...

Embodiment 3

[0084] An aqueous dispersion of an ethylene / vinyl acetate copolymer saponified product having an average particle diameter of 0.15 μm and a solid content concentration of 31% by weight was prepared in the same manner as in Example 1.

[0085] On the other hand, 2400 parts by weight of water was added to 100 parts by weight of polyvinyl alcohol (saponification degree 99.3 mol%, polymerization degree 1700), heated and dissolved at 95°C, and cooled to room temperature to obtain polyethylene with a solid content concentration of 4% by weight. alcohol solution. To the obtained aqueous polyvinyl alcohol solution, 2500 parts by weight of an aqueous dispersion of montmorillonite having a solid content concentration of 4% by weight and a particle diameter of 1.0 μm prepared separately was added under stirring to obtain an aqueous polyvinyl alcohol solution in which montmorillonite was dispersed. .

[0086] 100 parts by weight of the aqueous dispersion of the saponified ethylene / vinyl ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
saponificationaaaaaaaaaa
saponificationaaaaaaaaaa
saponificationaaaaaaaaaa
Login to View More

Abstract

An aqueous ethylene / vinyl alcohol copolymer dispersion which has excellent long-term storage stability, has excellent film-forming properties even when dried at a low temperature or in a short time or applied thick, and gives a film having high gas barrier performance. The aqueous ethylene / vinyl alcohol copolymer dispersion comprises (A) an ethylene / vinyl alcohol copolymer having an ethylene content of 15-65 mol% and a degree of saponification of 80 mol% or higher, (B) an ethylene / a,ss-unsaturated carboxylic acid copolymer neutralized with a base, and (C) polyvinyl alcohol having a degree of saponification of 75-100 mol% and a degree of polymerization of 100-3,500, the amount of the polyvinyl alcohol (C) being 0.5-100 parts by weight per 100 parts by weight of the ethylene / vinyl alcohol copolymer (A).

Description

technical field [0001] The present invention relates to aqueous dispersions. More specifically, it relates to an aqueous ethylene / vinyl alcohol copolymer dispersion. Background technique [0002] Ethylene / vinyl alcohol copolymers obtained by saponifying ethylene / vinyl acetate copolymers (hereinafter abbreviated as EVOH) are extremely excellent in gas barrier properties such as oxygen, fragrance retention, oil resistance, and chemical resistance. Therefore, it is suitable for use in molded products such as various films, sheets, and containers. In addition, it has also attracted attention as a protective coating material for metal surfaces, paper, wood, and the like. In particular, it is extremely excellent in gas barrier properties compared with other resin films, and it is extremely useful as a material for food packaging films, sheets, laminates, hollow containers, etc., which need to prevent oxidation of contents or maintain aroma. [0003] Generally, as a method of mo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/26B32B27/28C09D123/26
CPCC08L23/0861C08L23/16C08L2205/03C08L23/0876C08L2205/02C08L29/04C08L2666/06C08L2666/04C08L23/26C08L69/00
Inventor 船引裕平杉原范洋寺田和俊大堰幸雄南叶道之
Owner SUMITOMO SEIKA CHEM CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com