Aqueous Dispersion Adhesive for Low-Temperature Heat Sealing
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Solution Overview
Problem
Conventional heat sealing methods require longer times and higher temperatures, which can be inefficient for certain substrates and adherends, and often result in adhesion issues such as blocking between laminates.
Innovation Solution
An aqueous dispersion containing ethylene-unsaturated carboxylic acid copolymer, polymer with acrylic acid ester units, and ethylene-vinyl acetate copolymer, which forms composite particles that provide excellent adhesive strength and anti-blocking properties, even with short heat sealing times and low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heat sealing methods are used, then substrates can be bonded, but heat sealing time is long and temperature is high
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating specific polymers (ethylene-unsaturated carboxylic acid copolymer with 10-25 mass% unsaturated carboxylic acid content, and ethylene-vinyl acetate copolymer with 5-50 mass% vinyl acetate content) to enable heat sealing at lower temperatures and shorter times while maintaining bonding performance
Solution Approach 2:
The patent uses a composite adhesive system combining multiple polymer components (ethylene-unsaturated carboxylic acid copolymer, ethylene-vinyl acetate copolymer, and optionally acrylic polymer) with specific content ratios to achieve both low-temperature heat sealing capability and high bonding strength
2Strength
If conventional adhesive layers are used, then substrates can be bonded, but adhesive strength is insufficient
Solution Approach 1:
The patent optimizes the molecular composition parameters of the adhesive by controlling the content of functional groups and polymer types to achieve rapid adhesion development within 3 seconds at 150°C, balancing bonding strength and processing speed
3Strength
If conventional heat seal materials are used, then bonding can be achieved, but blocking occurs between laminates
Solution Approach 1:
The patent applies local quality control by forming an adhesive layer with specific thickness (1-10 μm) and controlled composition that provides sufficient bonding strength at the interface while preventing excessive adhesion between laminate surfaces, thereby eliminating blocking
Solution Approach 2:
The patent adjusts the chemical composition parameters of the adhesive layer, specifically controlling the content of ethylene-vinyl acetate copolymer (5-50 mass% vinyl acetate) and ethylene-unsaturated carboxylic acid copolymer to achieve optimal balance between adhesive strength and anti-blocking properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The aqueous dispersion and resulting laminate exhibit strong adhesive strength and prevent blocking, making them suitable for various industrial applications with improved productivity and reduced energy consumption.
Implementation Method 1
the resin component contains ethylene-unsaturated carboxylic acid copolymer (A), polymer having an acrylic acid ester unit as a polymerization unit (B), and ethylene-vinyl acetate copolymer (C); and contains composite particles (D) having the ethylene-unsaturated carboxylic acid copolymer (A) and the polymer having an acrylic acid ester unit as a polymerization unit (B) and composite particles (E) having the ethylene-unsaturated carboxylic acid copolymer (A) and the ethylene-vinyl acetate copolymer (C)
Implementation Method 2
a substrate such as a plastic film, vapor deposition film, metal foil, paper, and nonwoven fabric is bonded (that is, heat sealed) by heat and pressure
Data Source
Figure 1
AI summary
An aqueous dispersion contains a resin component and water, wherein the resin component contains composite particles (D) having the ethylene-unsaturated carboxylic acid copolymer (A) and the polymer having an acrylic acid ester unit as a polymerization unit (B), and composite particles (E) having the ethylene-unsaturated carboxylic acid copolymer (A) and the ethylene-vinyl acetate copolymer (C).