Polyester Adhesive Tape Composition for Thin, Clean-Peel Bonding
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Solution Overview
Problem
Conventional adhesive tapes, particularly those using polyester and acrylic adhesives, face challenges in achieving sufficient adhesive strength, cohesive strength, and recyclability, while also posing environmental burdens due to non-combustible waste and low biodegradability.
Innovation Solution
A polyester adhesive composition is developed with specific structural units derived from aliphatic polycarboxylic acids and polyalcohols, including a high content of aliphatic polycarboxylic acids with 4 or less carbon atoms and limited 1,4-butanediol, which enhances adhesive strength, biodegradability, and recyclability, and includes a crosslinking agent for improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional acrylic adhesive is used to make thin adhesive tape, then the tape thickness can be reduced to 30 μm or smaller, but the adhesive strength and cohesive strength become insufficient and adhesive residue is left when peeled off
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from conventional acrylic adhesive to polyester adhesive with specific structural units. The polyester adhesive contains structural units derived from aliphatic polycarboxylic acids (5-20 moles%) and cyclic carboxylic acids (80-95 moles%), which fundamentally alters the adhesive's molecular structure and bonding characteristics, enabling thin film application while maintaining high cohesive strength and preventing residue
Solution Approach 2:
The patent creates a composite adhesive system by combining polyester adhesive with specific additives including silane crosslinking agents (0.1-5 parts by mass per 100 parts polyester), peroxide curing agents, and inorganic fillers. This composite formulation enhances the cohesive strength and thermal stability of the thin adhesive layer, allowing it to maintain integrity during peeling without leaving residue
2Reliability
If adhesive tape is designed for strong bonding, then adhesive reliability is improved, but the tape becomes difficult to peel off and disassemble for recycling
Solution Approach 1:
The patent modifies the chemical composition of the adhesive to achieve balanced performance. The polyester adhesive with specific structural units provides strong initial bonding reliability while the incorporation of silane crosslinking agents and controlled molecular weight (5,000-100,000) enables controlled peeling behavior. The adhesive strength to substrates is maintained while cohesive strength allows clean separation without residue, facilitating recycling operations
3Reliability
If conventional adhesive tapes are used, then bonding functionality is achieved, but environmental impact increases due to noncombustible waste and low biodegradability
Solution Approach 1:
The patent fundamentally changes the adhesive chemistry from acrylic polymer to polyester polymer with specific structural units derived from aliphatic polycarboxylic acids and cyclic carboxylic acids. This compositional change makes the adhesive biodegradable and combustible, transforming it from environmental burden to environmentally friendly material while maintaining full bonding functionality
Solution Approach 2:
The patent promotes the use of biodegradable polyester adhesive that can naturally decompose after use, replacing conventional non-biodegradable acrylic adhesives. This allows the adhesive tape to be disposed of safely without persistent environmental contamination, aligning with sustainable development goals while maintaining effective bonding performance during its service life
Data Source
AI summary
The present disclosure relates to a polyester having a structural unit derived from polycarboxylic acids (a) and a structural unit derived from polyalcohols (b), wherein the polycarboxylic acids (a) contain aliphatic polycarboxylic acids (a1) having 4 or less carbon atoms, and a structural unit derived from the aliphatic polycarboxylic acids (a1) is in an amount of 50 moles or more in 100 moles of the structural unit derived from polycarboxylic acids (a).