Ethylene-Alkyl Acrylate Adhesive Composition for Peelable Packaging
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Solution Overview
Problem
Current adhesive sealing compositions for peelable packaging face challenges with thermal stability and transparency due to high levels of tackifying resins, which also lead to sticking issues during extrusion-coating and sheath opening, necessitating the use of processability additives that compromise optical properties.
Innovation Solution
A copolymer of ethylene and alkyl acrylate-based adhesive composition with a reduced level of tackifying resin (between 1.5% and 5% weight) and optimized processability additives, including anti-blocking and slippery agents, maintains good sealing properties while ensuring thermal stability and optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of tackifying resin (5-20% by weight) are used in the sealing adhesive composition, then sealing performance is improved, but thermal stability deteriorates and transparency is lost due to the need for high additive content
Solution Approach 1:
The patent changes the concentration parameter of tackifying resin from the conventional 5-20% range to a reduced 1.5-5% range, combined with optimizing the copolymer composition (ethylene and alkyl acrylate with specific acrylate content of 20-40%). This parameter change reduces the need for processability additives while maintaining sealing performance, thereby improving thermal stability and transparency.
2Reliability
If high levels of tackifying resin (5-20% by weight) are used in the sealing adhesive composition, then sealing performance is improved, but transparency deteriorates due to high additive content
Solution Approach 1:
The patent reduces the tackifying resin content parameter to 1.5-5% by weight and optimizes the copolymer composition with 20-40% acrylate content, which decreases the required amount of processability additives. This parameter optimization maintains adequate sealing performance while significantly improving the transparency and optical clarity of the sealing layer.
3Ease of manufacture
If high levels of processability additives are used to overcome sticking problems, then processability is improved, but optical properties such as brightness and transparency are compromised
Solution Approach 1:
The patent optimizes the composition parameters to contain 1.5-5% tackifying resin and carefully controls the content of processability additives (sliding agents and anti-blocking agents) to minimal levels. This parameter optimization reduces the total additive content, thereby maintaining good processability while preserving the optical properties including brightness, transparency, and clarity of the sealing film.
Data Source
Figure 1a~1e
AI summary
The present invention relates to an adhesive composition that can be used in an extrusion-coating process for application to a support or in an extrusion-laminating process in order to bond several supports of different or identical nature to one another, over a wide temperature range, comprising: - from 91% to 98% by weight of said composition, of a copolymer of ethylene and of alkyl acrylate; - at least one tackifying resin; - processing aids, characterized in that the tackifying resin represents between 1.5% and 5.5% of the weight of the composition and said processing aids represent between 0.5% and 3.5% of the weight of the composition and in that the anti-blocking agent represents, in the processing aids, at least 60% by weight of said aids. The invention also relates to a film consisting of said composition and a multilayer structure that includes this film.