Hot melt adhesive agent for container with straw
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Solution Overview
Problem
Existing hot melt adhesive agents for containers with straws fail to provide sufficient adhesive properties across a broad temperature range, particularly on paper and plastic substrates, and are prone to viscosity changes and tackiness, which affects their performance and consumer comfort.
Innovation Solution
A hot melt adhesive agent comprising an amorphous poly-α-olefin and a metallocene polymer, combined with a tackifying resin and wax, which maintains viscosity and reduces tackiness, ensuring strong adhesion from 4°C to 50°C and preventing blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a styrene-based hot melt adhesive agent is used, then adhesive properties to metal containers are improved, but adhesive properties to paper containers are insufficient
Solution Approach 1:
The patent uses a composite adhesive system combining a polyolefin resin (base polymer) with a styrene-based copolymer adhesive. This composite formulation provides broad substrate compatibility including paper, metal, and plastic containers while maintaining strong adhesive properties. The polyolefin resin serves as the primary adhesive component that bonds to various substrates, while the styrene-based copolymer enhances adhesion strength and provides flexibility.
2Strength
If a hot melt adhesive agent is used for refrigerated containers, then adhesive properties at low temperature are required, but viscosity stability at high temperature during storage is also required
Solution Approach 1:
The patent carefully selects and adjusts the molecular weight, composition ratio, and structural parameters of the polyolefin resin and styrene-based copolymer to achieve optimal performance. The polyolefin resin with specific molecular weight provides low-temperature adhesion, while the copolymer composition (5-50 wt% of total adhesive) ensures high-temperature viscosity stability. This parameter optimization allows the adhesive to maintain appropriate viscosity across the temperature range from 4°C to 180°C.
3Productivity
If the adhesive agent is kept in high temperature state for long period, then manufacturing efficiency is improved, but viscosity change occurs
Solution Approach 1:
The patent employs a polyolefin resin that exhibits thermal stability during the manufacturing process. The resin is designed to maintain its viscosity characteristics even when held at high temperatures (around 180°C) for extended periods in the coating tank. This thermal stability allows the adhesive to be reused in the coating system without significant degradation, improving manufacturing efficiency while maintaining consistent application properties.
4Strength
If the adhesive agent is made tacky for strong adhesion, then adhesive strength is improved, but blocking occurs and consumer comfort is reduced
Solution Approach 1:
The patent creates different functional zones within the adhesive system: the polyolefin resin provides the primary adhesive bonding function with appropriate tackiness for strong adhesion to substrates, while the styrene-based copolymer component (present in controlled amounts of 5-50 wt%) modifies the surface properties to reduce excessive tackiness and blocking. This compositional differentiation allows the adhesive to exhibit strong bonding strength without causing consumer discomfort from excessive surface tackiness or blocking between stacked containers.
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 provides excellent adhesion to paper and plastic substrates across a wide temperature range, maintains viscosity over time, and reduces tackiness, enhancing manufacturing efficiency and consumer comfort.
Implementation Method 1
a hot melt adhesive agent comprising an amorphous poly-α-olefin and a metallocene polymer which makes a plastic film packaging a straw adhere to a container
Implementation Method 2
a hot melt adhesive agent which makes a plastic film packaging a straw adhere to a container
Data Source
AI summary
To provide a hot melt adhesive agent which is excellent in adhesive properties to a substrate material such as paper and a polyolefin, is also excellent in adhesive properties from a low temperature (around 4° C.) to a high temperature (around 50° C.), has little viscosity change even when a long time elapses, and has tack that is not too high. Provided is a hot melt adhesive agent for a container with a straw comprising an amorphous poly-α-olefin (A) and a metallocene polymer (B).