Low-E Glass Protective Sheet PSA Layer Removability
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Solution Overview
Problem
Low-E glass plates face challenges with protective sheets that lose removability over time due to increased adhesive strength, leading to surface contamination and degradation.
Innovation Solution
A protective sheet with a PSA layer comprising at least 95% base polymer by weight, limiting the use of additives that affect aged removability and preventing surface contamination, while maintaining good adhesion to Low-E glass plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective sheet with PSA layer is used to protect Low-E glass plates, then adhesive strength increases and protection effectiveness improves, but removability deteriorates and surface contamination occurs after prolonged adhesion
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the PSA to be 0°C or lower, and setting the weight average molecular weight within a specific range (10,000 to 1,000,000). These parameter optimizations ensure the adhesive maintains appropriate strength for protection while preserving removability after prolonged adhesion, preventing surface contamination.
Solution Approach 2:
The patent uses composite materials by formulating the PSA as a copolymer containing specific monomer units (carboxyl group-containing monomers, hydroxyl group-containing monomers, and ester group-containing monomers) in controlled proportions. This composite structure achieves both strong adhesion for effective protection and controlled removability without surface contamination.
2Ease of operation
If adhesive strength adjuster is added to reduce increase in aged adhesive strength, then removability is improved, but surface contamination occurs due to transfer of the adjuster to the adherend surface
Solution Approach 1:
The patent extracts and eliminates the need for adhesive strength adjusters by directly optimizing the PSA composition and molecular weight parameters. The purified adhesive system achieves both protection effectiveness and removability without requiring additional chemical additives that would cause surface contamination.
Solution Approach 2:
The patent changes the fundamental parameters of the PSA (Tg ≤ 0°C, specific molecular weight range, copolymer composition) to inherently achieve the desired balance between adhesion strength and removability, making adhesive strength adjusters unnecessary and thus preventing surface contamination from such additives.
3Strength
If PSA layer contains additives to adjust adhesive properties, then adhesion performance is improved, but aged removability deteriorates
Solution Approach 1:
The patent optimizes critical parameters including Tg (0°C or lower), weight average molecular weight (10,000 to 1,000,000), and copolymer composition ratios. These parameter changes enable the PSA to maintain strong initial adhesion while preserving removability after aging, eliminating the need for conventional additives that would compromise aged removability.
Solution Approach 2:
The patent employs a composite copolymer structure with specifically controlled ratios of different monomer units (carboxyl group-containing, hydroxyl group-containing, and ester group-containing monomers). This composite material design achieves both strong adhesion and maintained removability after aging without requiring additional additives.
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 protective sheet effectively maintains removability and prevents surface contamination of Low-E glass plates even after prolonged adhesion, while also preventing erosion and degradation of the Low-E layer.
Implementation Method 1
pressure-sensitive adhesive (or PSA; the same applies hereinafter) can be preferably used. In general, pressure-sensitive adhesive has characteristics of being in a soft solid (viscoelastic) state in a room temperature range and easily adhering to adherend under some pressure.
Implementation Method 2
pressure-sensitive adhesive has characteristics of being in a soft solid (viscoelastic) state in a room temperature range
Data Source
AI summary
Provided is a Low-E glass plate protective sheet that can have protective properties for a Low-E glass plate as an object to be protected and can maintain good removability while preventing or inhibiting surface contamination of the object to be protected even when prolongedly adhered thereto. The Low-E glass plate protective sheet is provided. The protective sheet has a PSA layer. The PSA layer comprises at least 95% base polymer by weight.