Aqueous Ethylene Copolymer Dispersion for Blocking-Resistant Adhesive Coatings
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Solution Overview
Problem
Existing ethylene-based copolymers used in aqueous dispersion liquids face issues with blocking phenomena during storage due to acid groups, leading to decreased adhesive force and mechanical properties, and require improved adhesive reliability.
Innovation Solution
An aqueous dispersion composition comprising a first ethylene-based copolymer with a melting temperature of 84°C or higher and a second ethylene-based copolymer with a melting temperature below 80°C, with the second copolymer content ranging from 70 wt% to 90 wt%, enhances adhesive reliability by balancing dispersibility, flowability, and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an anti-blocking agent is added to resolve blocking phenomenon, then blocking is reduced, but adhesive force and mechanical properties decrease
Solution Approach 1:
The patent extracts and removes the harmful blocking phenomenon by carefully controlling and optimizing the copolymer composition ratios, specifically adjusting the content of ethylene-acrylic acid copolymer to 70-90 wt% and ethylene-maleic anhydride copolymer to 10-30 wt%, thereby eliminating the need for anti-blocking agents while maintaining both anti-blocking performance and adhesive strength
Solution Approach 2:
The patent changes the compositional parameters of the copolymer system by precisely controlling the weight ratios of different copolymers and the content of acid groups (0.5-5.0 mmol/g), transforming the system from one that requires additives to one that inherently balances anti-blocking and adhesive properties through composition optimization
2Strength
If ethylene-based copolymer with acid groups is used for adhesive properties, then adhesive capability is improved, but blocking phenomenon occurs during storage
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific copolymer types (ethylene-acrylic acid and ethylene-maleic anhydride) with controlled acid group contents (0.5-5.0 mmol/g), optimizing the balance between adhesive properties and storage stability without adding external agents
Solution Approach 2:
The patent creates a composite copolymer system combining ethylene-acrylic acid copolymer (70-90 wt%) and ethylene-maleic anhydride copolymer (10-30 wt%), where the synergistic interaction between the two copolymers provides both adhesive capability and resistance to blocking phenomenon
Data Source
Figure 1
AI summary
An aqueous dispersion composition according to embodiments of the present disclosure includes a first ethylene-based copolymer having a melting temperature of 84°C or higher and a second ethylene-based copolymer having a melting temperature of less than 80°C, wherein a content of the second ethylene-based copolymer is 70 wt% to 90 wt% based on a total weight of the first ethylene-based copolymer and the second ethylene-based copolymer, and a total content of the first ethylene-based copolymer and the second ethylene-based copolymer is 50 wt% or more based on a total solid content weight of the aqueous dispersion composition.