Resin Acid Ester Tackifier Reduces Hot Melt Adhesive Viscosity
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Solution Overview
Problem
Synthetic rubber elastomers in hot melt adhesives are challenging to work with due to high viscosity, which requires high temperatures, leading to ingredient deterioration and substrate deformation, and increased energy costs.
Innovation Solution
A tackifier composed of 70% or more of a resin acid ester with specific parameters, including a S′NMR/SNMR ratio of at least 6% and containing glycerin, which reduces melt viscosity and improves compatibility with synthetic rubber elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If synthetic rubber elastomers are heated at high temperature to reduce viscosity, then coatability is improved, but ingredient deterioration and substrate deformation occur
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive system by introducing a specific ester compound with defined molecular weight and functional group ratios. This parameter change allows the system to achieve low viscosity at lower temperatures, resolving the contradiction between coatability and ingredient stability.
Solution Approach 2:
The ester compound acts as an intermediary substance that mediates between the synthetic rubber elastomer and the processing conditions. It reduces the interaction strength between elastomer molecules, enabling flow at lower temperatures without compromising the stability of other ingredients.
2Ease of operation
If synthetic rubber elastomers are heated at very high temperature to reduce viscosity, then coatability is improved, but substrate deformation occurs
Solution Approach 1:
The invention modifies the rheological parameters of the adhesive composition by adding the ester compound, which has specific molecular weight (500-5000) and functional group ratio (0.1-1.0). This enables the adhesive to achieve appropriate viscosity for coating at temperatures below 100°C, preventing substrate deformation while maintaining coatability.
3Ease of operation
If synthetic rubber elastomers are heated at high temperature, then viscosity is reduced, but energy consumption increases
Solution Approach 1:
The invention changes the compositional parameters of the adhesive system by incorporating an ester compound with specific molecular characteristics. This modification reduces the activation energy required for viscous flow, allowing coating operations to proceed at lower temperatures and thus reducing heating energy consumption while maintaining coatability.
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 tackifier effectively reduces melt viscosity, enhancing coatability and adhesive properties, while maintaining color stability and heat resistance, suitable for both medical and industrial applications.
Implementation Method 1
the ester composition comprising 70% by weight or more of a resin acid ester represented by the general formula (1)... having a good compatibility with a synthetic rubber elastomer in a varnish state or hot melt state
Implementation Method 2
being capable of effectively reducing the melt viscosity of the synthetic rubber elastomer in a hot melt state
Implementation Method 3
being capable of imparting excellent adhesive performance to the synthetic rubber elastomer
Data Source
AI summary
Provided is a resin acid ester-based tackifier having a good compatibility with a synthetic rubber elastomer, being capable of reducing the melt viscosity of the elastomer, and being capable of imparting excellent adhesive properties and/or pressure-sensitive adhesive properties to the elastomer.