Multilayer Structure EVOH Thermoplastic Elastomer Delamination
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Solution Overview
Problem
Current multilayer structures for delaminatable containers lack sufficient delamination properties, gas barrier properties, transparency, and flexibility, particularly when used as packaging materials for foods and beverages.
Innovation Solution
A multilayer structure comprising a resin composition with an ethylene-vinyl alcohol copolymer and a thermoplastic elastomer, where the mass ratio of ethylene-vinyl alcohol copolymer to thermoplastic elastomer is between 65/35 and 95/5, with the thermoplastic elastomer dispersed in the ethylene-vinyl alcohol copolymer matrix, and having a refractive index difference of 0.05 or less, to achieve good delamination, gas barrier, and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer structure uses EVOH resin for gas barrier properties, then gas barrier performance is improved, but delamination properties and flexibility deteriorate
Solution Approach 1:
The patent applies composite materials by combining EVOH resin (providing gas barrier properties) with a thermoplastic elastomer (providing flexibility and delamination properties) in a specific mass ratio range of 65:35 to 95:5. This composite resin composition allows simultaneous achievement of gas barrier performance and delamination properties that cannot be obtained with EVOH alone.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the mass ratio of EVOH to thermoplastic elastomer within 65:35 to 95:5, and by controlling the refractive index difference between the two materials to 0.05 or less. These parameter optimizations enable the material to achieve both gas barrier properties and flexibility/delamination properties.
2Reliability
If a multilayer structure uses EVOH resin for gas barrier properties, then gas barrier performance is improved, but transparency and flexibility deteriorate
Solution Approach 1:
The patent applies composite materials by combining EVOH resin (providing gas barrier properties) with a thermoplastic elastomer (providing transparency and flexibility) in a specific mass ratio range of 65:35 to 95:5. This composite resin composition allows simultaneous achievement of gas barrier performance and transparency that cannot be obtained with EVOH alone.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the mass ratio of EVOH to thermoplastic elastomer within 65:35 to 95:5, and by controlling the refractive index difference between the two materials to 0.05 or less. These parameter optimizations enable the material to achieve both gas barrier properties and transparency.
3Reliability
If a multilayer structure uses EVOH resin for gas barrier properties, then gas barrier performance is improved, but flexibility deteriorates
Solution Approach 1:
The patent applies composite materials by combining EVOH resin (providing gas barrier properties) with a thermoplastic elastomer (providing flexibility) in a specific mass ratio range of 65:35 to 95:5. This composite resin composition allows simultaneous achievement of gas barrier performance and flexibility that cannot be obtained with EVOH alone.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the mass ratio of EVOH to thermoplastic elastomer within 65:35 to 95:5. These parameter optimizations enable the material to achieve both gas barrier properties and flexibility.
Data Source
AI summary
A multilayer structure includes a layer of a resin composition containing an ethylene-vinyl alcohol copolymer and a thermoplastic elastomer, wherein a mass ratio of the ethylene-vinyl alcohol copolymer to the thermoplastic elastomer is from 65/35 to 95/5 and the layer of the resin composition has one surface directly adjacent to a layer of polyolefin with no polar functional group. A multilayer structure is thus provided that is excellent in gas barrier properties, transparency, and flexibility and also has good delamination properties between the layer of the resin composition and the layer of the polyolefin with no polar functional group.