Hot-melt Adhesive Agent for Disposable Products
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Solution Overview
Problem
Existing hot-melt adhesive agents for disposable products like paper diapers and napkins face challenges in maintaining adhesiveness across wide temperature ranges, balancing tackiness and retention force, and applying at low temperatures without compromising material durability or increasing costs.
Innovation Solution
A hot-melt adhesive agent comprising a thermoplastic block copolymer of vinyl class aromatic hydrocarbons and conjugated diene compounds, specifically a radial type styrene block copolymer and a triblock type styrene block copolymer, along with a tackifier resin, plasticizer, and stabilizer, which allows for low-temperature application and maintains adhesiveness from 10 to 40°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the amount of base polymer is decreased to increase the amount of plasticizer to lower viscosity, then the viscosity is reduced for low-temperature application, but the balance between adhesiveness to polyethylene film and retention force is deteriorated and the softening point is excessively lowered
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive agent by introducing a specific copolymer component with controlled softening point and incorporating plasticizers within a defined melting point range. This allows lowering the application temperature while maintaining the balance between adhesiveness and retention force through precise parameter control rather than simply increasing plasticizer content
Solution Approach 2:
The patent creates a composite adhesive system combining base polymer, copolymer component, and plasticizer with specifically selected properties. The copolymer acts as a bridge component that maintains structural integrity while the plasticizer enables low-temperature application, achieving a synergistic effect that resolves the contradiction between low viscosity and balanced adhesive properties
2Ease of manufacture
If the polyethylene film is thinned to reduce material costs and improve flexibility, then the material cost decreases and flexibility improves, but the heat resistance deteriorates causing melting or wrinkle formation at high temperatures
Solution Approach 1:
The patent modifies the thermal parameters of the adhesive system by selecting plasticizers with melting points between -50°C and 50°C and copolymers with softening points between -50°C and 50°C. This creates an adhesive that remains stable at lower temperatures suitable for thin films while preventing wrinkle formation and melting through controlled thermal response
3Temperature
If a low-temperature-applicable hot-melt adhesive agent is developed to prevent polyethylene film melting, then the application temperature is lowered to avoid film damage, but the adhesiveness at low temperature in winter or at high temperature in summer becomes insufficient
Solution Approach 1:
The patent optimizes the softening point of the copolymer component and the melting point of the plasticizer to create a thermal window that maintains adhesive performance across wide temperature ranges. The specific parameter selection ensures the adhesive remains effective from cold winter conditions to hot summer conditions while enabling low-temperature application
Solution Approach 2:
The adhesive agent is designed to perform multiple functions: enabling low-temperature application to protect thin films, maintaining adhesiveness across extreme temperature variations, and providing balanced retention force. The copolymer-plasticizer system achieves universal performance across different seasonal and environmental conditions
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 adhesive agent achieves excellent adhesiveness and retention force across a wide temperature range, enabling secure bonding of polyethylene films and nonwoven webs without peeling, even at low temperatures, thus enhancing the performance and durability of disposable products.
Implementation Method 1
the hot-melt adhesive agent is melted by heating so as to obtain an appropriate viscosity
Implementation Method 2
The adhesive agent achieves excellent adhesiveness and retention force across a wide temperature range, enabling secure bonding of polyethylene films and nonwoven webs without peeling
Data Source
AI summary
Problem to be solved of the present invention is to provide a hot-melt adhesive agent which is capable of applying at low temperature, excellent in adhesiveness at the wide temperature ranges (10 to 40° C.), and excellent in balance between tackiness and retention force, and a disposable product obtained by employing the hot-melt adhesive agent. Means for Solving the problem is a hot-melt adhesive agent comprising a thermoplastic block copolymer (A) which is a copolymer of vinyl class aromatic hydrocarbons and conjugated diene compounds, wherein the thermoplastic block copolymer (A) comprises the following component (A1) and component (A2): (A1) a radial type styrene block copolymer having a styrene content of 35 to 45% by weight, a diblock content of 50 to 90% by weight, and has a viscosity at 25° C. as 25% toluene solution of not more than 250 mPa·s; and (A2) a triblock type styrene block copolymer.