Ethylene-Butyl Acrylate Hot-Melt Adhesive for Molten Transparency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hot-melt adhesive compositions based on ethylene-vinyl acetate copolymers and ethylene-n-butyl acrylate copolymers with high n-butyl acrylate content are not transparent in the molten state, leading to difficulties in monitoring thermal stability and increasing the risk of production shutdowns due to gelification and charring, and they are not compatible with certain adhesive resins.
Innovation Solution
Using an ethylene-n-butyl acrylate copolymer with a specific n-butyl acrylate concentration range and melt flow index, combined with hydrogenated hydrocarbon resin, wax, and antioxidants, to create a transparent and thermally stable hot-melt adhesive composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ethylene-n-butyl acrylate copolymer with high n-butyl acrylate content is used, then adhesive strength is improved, but transparency in molten state deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the n-butyl acrylate concentration within 20-30 wt% and the melt flow index within 300-700 g/10min. This optimization of compositional parameters allows the copolymer to provide sufficient adhesive strength while maintaining transparency in the molten state, thereby resolving the contradiction between adhesive strength and transparency.
2Ease of operation
If ethylene-vinyl acetate copolymer is used, then ease of operation is improved, but compatibility with adhesive resins deteriorates
Solution Approach 1:
The patent replaces ethylene-vinyl acetate copolymer with ethylene-n-butyl acrylate copolymer and optimizes the compositional parameters (n-butyl acrylate concentration at 20-30 wt%, melt flow index at 300-700 g/10min). This parameter change improves compatibility with hydrogenated hydrocarbon adhesive resins while maintaining ease of operation through the copolymer's inherent processability.
3Reliability
If transparency monitoring is implemented, then thermal stability is improved, but production shutdown risk increases
Solution Approach 1:
The patent applies beforehand cushioning by selecting an ethylene-n-butyl acrylate copolymer with optimized parameters (20-30 wt% n-butyl acrylate, 300-700 g/10min melt flow index) that inherently resists gelification and charring. This preventive approach ensures thermal stability from the outset, allowing transparency monitoring to detect issues early without causing unnecessary production shutdowns.
Data Source
AI summary
A thermo-fusible adhesive composition comprising at least one ethylene and butyl acrylate copolymer cohesion agent. The thermos-fusible adhesive composition may further comprise at least one adhesive hydrocarbon resin, preferably hydrogenated, and at least one ethylene and acrylate copolymer. The present disclosure also relates to the use of the corresponding thermo-fusible adhesive compositions in the production of manufactured articles.