Plant-Derived Polyester Masking Sheet Adhesive
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Solution Overview
Problem
Conventional masking sheets using petroleum-derived materials face issues with oil depletion and carbon dioxide emissions during disposal, lacking environmental consideration due to fossil resource consumption.
Innovation Solution
A polyester-based masking sheet with a pressure-sensitive adhesive layer using plant-derived materials, specifically a polyester resin formed by condensation of plant-derived dicarboxylic acid and diol, incorporating a tackifier and crosslinking agent to achieve a gel fraction of 40-90%, applied to a substrate, which reduces unwinding load and prevents adhesive residue at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If petroleum-derived acrylic material is used as the active ingredient of the pressure-sensitive adhesive layer, then the masking sheet has good adhesive performance, but it causes oil depletion and carbon dioxide emissions during disposal
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from petroleum-derived acrylic material to plant-derived polyester resin with specific hydroxyl group content (1.01-1.40 mol per 1.00 mol of carboxyl group). This parameter change maintains adhesive performance while eliminating fossil resource dependence and reducing environmental harm through carbon-neutral disposal
Solution Approach 2:
The patent creates a composite adhesive system combining plant-derived polyester resin as the base material with added tackifiers (10-50 parts by weight per 100 parts polyester resin) and crosslinking agents. This composite approach ensures the plant-derived material achieves the necessary adhesive performance to replace petroleum-derived materials without compromising reliability
2Productivity
If the masking sheet is designed for high-speed unwinding, then productivity increases, but the load during unwinding becomes excessive
Solution Approach 1:
The patent optimizes the gel fraction parameter of the crosslinked adhesive layer to 40-90%, which balances the adhesive's cohesive strength. This parameter optimization reduces the unwinding load during high-speed operations while maintaining sufficient adhesive performance for masking functionality
Solution Approach 2:
The crosslinked adhesive structure with controlled gel fraction provides dynamic properties that allow the masking sheet to unwind smoothly at high speeds. The crosslinking creates a balanced network structure that prevents excessive load while maintaining integrity during rapid deployment
3Temperature
If the masking sheet is used at high temperatures, then the masking performance is maintained, but adhesive residue or contamination is left during peeling
Solution Approach 1:
The patent carefully controls the hydroxyl group content parameter of the plant-derived diol (1.01-1.40 mol per 1.00 mol of carboxyl group) and the gel fraction (40-90%) to optimize the adhesive's thermal behavior. This parameter control ensures the adhesive maintains bonding at high temperatures while allowing clean peeling without residue
Solution Approach 2:
The plant-derived polyester resin is designed as a disposable adhesive that can be used at high temperatures and then cleanly removed. The controlled composition and crosslinking create an adhesive that fulfills its temporary masking function and can be discarded without leaving harmful residue, aligning with the disposable nature of masking sheets
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 an earth-friendly, high-performance masking sheet that maintains adhesive force, reduces carbon footprint, and enables carbon-neutral disposal without leaving adhesive residue or contamination, even at high temperatures, addressing the environmental concerns of fossil resource depletion and carbon dioxide emissions.
Implementation Method 1
a polyester resin obtained by condensation-polymerizing a plant-derived dicarboxylic acid with a plant-derived diol
Implementation Method 2
is crosslinked by a crosslinking agent to have a gel fraction of 40 to 90%
Implementation Method 3
maintaining the pressure-sensitive adhesive force to an adherend and the own back surface
Data Source
AI summary
The present invention relates to a polyester-based masking sheet including: a substrate; and a pressure-sensitive adhesive layer provided on the substrate, which contains a polyester resin obtained by condensation-polymerizing a plant-derived dicarboxylic acid with a plant-derived diol in a ratio such that a content of hydroxyl group in the diol is from 1.01 to 1.40 mol per 1.00 mol of carboxyl group contained in the dicarboxylic acid, and a tackifier in an amount of from 10 to 50 parts by weight per 100 parts by weight of the polyester resin, and is crosslinked by a crosslinking agent to have a gel fraction of 40 to 90%.