Radiation-Cure Removable Adhesive Sheet Using Plant-Derived Polyester
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Solution Overview
Problem
Current removable pressure-sensitive adhesive sheets are not environmentally friendly due to fossil resource usage and lack of plant-derived alternatives, particularly for acryl-based adhesives, which are not available, leading to concerns about resource depletion and carbon emissions.
Innovation Solution
A radiation-cure removable type pressure-sensitive adhesive sheet is developed using a polyester-based adhesive composition containing lactic acid, dibasic acid, and glycol units, with specific molecular weight and glass transition temperature ranges, and incorporating a radiation-cure resin, initiator, and crosslinking agent to ensure stable adhesion and peelability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fossil resource-derived materials are used for removable pressure-sensitive adhesive sheets, then adhesive performance and availability are ensured, but resource depletion and carbon emissions increase
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from fossil-based to plant-based materials. Specifically, it uses polyesters containing lactic acid units (10-50 mol%), dibasic acid units (40-85 mol%), and glycol units (5-20 mol%), with controlled molecular weight (20,000-200,000) and glass transition temperature (-70 to -20°C), achieving both environmental sustainability and reliable adhesive performance
Solution Approach 2:
The patent creates a composite adhesive system combining multiple plant-derived components: polyester base resin, radiation-cure resin (30-70 parts by weight per 100 parts polyester), crosslinking agents, and radiation reaction initiators. This composite structure enables the adhesive to exhibit both eco-friendliness and functional reliability through synergistic material interactions
2Object-affected harmful factors
If plant-derived materials are used to replace fossil resources in adhesive sheets, then environmental friendliness is improved, but adhesive stability and peelability may deteriorate
Solution Approach 1:
The patent precisely controls critical parameters of the polyester: weight average molecular weight (20,000-200,000), glass transition temperature (-70 to -20°C), and molar ratios of lactic acid (10-50%), dibasic acid (40-85%), and glycol (5-20%) units. These parameter optimizations ensure the plant-based adhesive achieves stable adhesion before irradiation and controlled peelability after irradiation
Solution Approach 2:
The patent incorporates a radiation-cure resin system with crosslinking agents and radiation reaction initiators into the plant-based polyester adhesive before use. This preliminary preparation enables the adhesive to undergo controlled crosslinking upon radiation exposure, transforming from a stable state to a peeled state, thereby ensuring both adhesive stability during use and controllability during removal
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 solution provides a globally environmentally friendly adhesive sheet with stable adhesive properties before radiation exposure and good peelability afterward, reducing fossil resource depletion and achieving carbon neutrality.
Implementation Method 1
a radiation-cure removable type pressure-sensitive adhesive sheet, including: a pressure-sensitive adhesive layer made from a polyester-based pressure-sensitive adhesive composition containing a polyester including at least a lactic acid unit, a dibasic acid unit, and a glycol unit, a radiation-cure resin, a radiation reaction initiator, and a crosslinking agent
Data Source
AI summary
Provided is a radiation-cure removable type pressure-sensitive adhesive sheet that is produced using plant-derived raw materials and has stable adhesive properties and also has good removability after exposure to radiation. The radiation-cure removable type pressure-sensitive adhesive sheet includes: a pressure-sensitive adhesive layer made from a polyester-based pressure-sensitive adhesive composition containing a polyester including at least a lactic acid unit, a dibasic acid unit, and a glycol unit, a radiation-cure resin, a radiation reaction initiator, and a crosslinking agent, wherein the dibasic acid unit includes a dimer acid, the polyester has a glass transition temperature of -70 to -20°C, a weight average molecular weight of 20,000 to 200,000, and a hydroxyl value of 1 to 60 mgKOH/g, the composition contains 30 to 70 parts by weight of the radiation-cure resin based on 100 parts by weight of the polyester and contains 3 to 10% by weight of the radiation reaction initiator based on the amount of the radiation-cure resin, and the pressure-sensitive adhesive layer has a gel fraction of 20 to 80% by weight before exposure to radiation.