Self-Adhesive Composition for Residual Adhesive Removal
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Solution Overview
Problem
Existing self-adhesive sheets for surface protection face issues with residual adhesive and waterproofness, particularly under high temperature conditions, leading to unevenness and deformation on coatings, which are exacerbated by water exposure.
Innovation Solution
A self-adhesive composition comprising a hydrogenated styrene elastomer and an amorphous polypropylene elastomer, with specific block copolymer configurations and additives, is developed to enhance adhesive strength, clean removability, and waterproofness, eliminating the need for softeners and tackifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing self-adhesive compositions are used to achieve adhesive strength, then the sheets can maintain attachment under normal conditions, but they leave residual adhesive and cause surface marks when exposed to high temperatures and water
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by incorporating specific block copolymers with defined styrene and diene content ratios, molecular weight ranges, and hardness specifications. This parameter optimization allows the adhesive to maintain strong bonding while enabling clean removal without residual adhesive or surface marks, even under high temperature and humidity conditions
Solution Approach 2:
The patent creates a composite adhesive system combining multiple polymer components (block copolymer, random copolymer, and optional polyolefin) with complementary properties. The block copolymer provides adhesive strength and elasticity, the random copolymer enhances processability and prevents premature bonding, and the polyolefin adds thermal stability, together achieving both strong adhesion and clean removability
2Strength
If the self-adhesive sheet is made harder to improve adhesive strength, then it resists deformation better, but it leaves more conspicuous marks under high temperature conditions
Solution Approach 1:
The patent optimizes the hardness parameter of the block copolymer to fall within the specific range of 40 to 90 on the JIS A scale. This parameter control ensures the adhesive has sufficient strength to resist deformation and maintain bonding integrity, while remaining soft enough to allow clean removal without leaving conspicuous marks on the surface
3Object-generated harmful factors
If the self-adhesive composition is made softer to reduce marks, then it removes more cleanly, but it has lower adhesive strength and poor waterproofness
Solution Approach 1:
The patent formulates a composite adhesive system where the block copolymer (with controlled hardness of 40-90 JIS A) provides the base adhesive properties and clean removability, while optional polyolefin additives (0-40 parts by weight per 100 parts block copolymer) enhance waterproofness and thermal stability without compromising the softness needed for mark-free removal
4Ease of operation
If conventional self-adhesive agents are used to achieve initial adhesion, then they can be applied easily, but they lose adhesive performance and leave residual adhesive when exposed to temperatures exceeding 70°C
Solution Approach 1:
The patent specifies the block copolymer's glass transition temperature (Tg) should be between -50°C and 50°C, with preferred ranges of -30°C to 30°C. This Tg parameter control ensures the adhesive remains flexible and maintains bonding capability across a wide temperature range from cold to hot conditions, preventing performance degradation and residual adhesive formation at temperatures exceeding 70°C
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 achieves high levels of clean adhesive removability and waterproofness, even at 90°C, reducing residual adhesive and surface marks, while maintaining effective protection under severe temperature and humidity conditions.
Implementation Method 1
the self-adhesive composition has a maximum value of tanδ at 10 Hz in the range of 0.6 or more and less than 1.1
Implementation Method 2
exhibits good waterproofness even in the presence of water
Data Source
AI summary
Provided is a self-adhesive composition which can remedy the occurrence of residual adhesive when the self-adhesive agent is exposed to high temperatures, a self-adhesive sheet comprising the self-adhesive composition, and a method for producing the self-adhesive sheets. The self-adhesive composition comprising a styrene elastomer (component A) and an amorphous polypropylene elastomer (component B), wherein the component A is a hydrogenated product of a block copolymer formed by copolymerization of at least a polymer block comprising styrene compound-derived units, a block resulting from 1,2-vinyl polymerization of units derived from a diene compound 1, a block resulting from 1,4-addition polymerization of units derived from a diene compound 1, a block resulting from 1,2-vinyl polymerization of units derived from a diene compound 2, and a block resulting from 1,4-addition polymerization of units derived from a diene compound 2; and when the [tanδ]pmax of the self-adhesive composition is 0.6 or more and less than 1.1, the content of the component A is 60 to 80 wt%, and when the [tanδ]pmax of the self-adhesive composition is 1.1 to 3.0, the content of the component A is 50 to 80 wt%.