Protective Layer Transfer Sheet Peel Force Stability
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Solution Overview
Problem
Conventional protective layer transfer sheets experience separation failure due to increased peel force after long-term storage or elevated temperatures, and significant variations in peel force occur with changes in energy applied during transfer, leading to unstable protective layer transfer.
Innovation Solution
A protective layer transfer sheet comprising a substrate sheet with a heat-resistant slip layer and a thermally transferable protective layer, where the protective layer consists of a peel layer, a primer layer, and an adhesive layer in that order, using an acrylic copolymer resin with a solution acid value of 0.2-2 mg KOH/g to maintain consistent peel force and prevent separation failure, and incorporating colloidal ultrafine particles and isocyanate compounds for enhanced adhesion and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protective layer transfer sheet is used, then the protective layer can be transferred initially, but separation failure occurs after long-term storage or elevated temperature storage due to increased peel force
Solution Approach 1:
The invention changes the chemical parameter of the peel layer by specifying an acrylic copolymer resin with a solution acid value of 2 mg KOH/g or less. This parameter control prevents excessive peel force development during storage, maintaining reliable protective layer transfer both initially and after long-term or elevated temperature storage.
Solution Approach 2:
The invention uses a composite material system consisting of a substrate sheet, a peel layer made of acrylic copolymer resin, a primer layer, and an adhesive layer. This multi-layer composite structure with specific material compositions ensures stable protective layer transfer by balancing adhesion and release properties throughout the product lifecycle.
2Adaptability or versatility
If energy applied during protective layer transfer is varied due to printer type or environmental conditions, then transfer conditions change, but this causes significant variation in peel force leading to unstable transfer
Solution Approach 1:
The invention controls the peel force parameter by using an acrylic copolymer resin with a solution acid value of 2 mg KOH/g or less. This parameter optimization ensures that peel force remains substantially unchanged even when energy applied during transfer varies due to different printer types or environmental conditions, achieving both adaptability and reliability.
3Ease of manufacture
If the peel layer uses conventional materials, then initial transfer may work, but peel force increases significantly after storage causing separation failure
Solution Approach 1:
The invention changes the chemical composition parameter of the peel layer by using an acrylic copolymer resin with a solution acid value of 2 mg KOH/g or less. This specific parameter control maintains easy protective layer transferability while preventing excessive peel force increase during storage, avoiding separation failure.
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 prevents separation failure during protective layer transfer after long-term storage or high-temperature storage and ensures stable transfer even with variations in applied energy, resulting in improved durability and reliability of the transferred images.
Implementation Method 1
the peel layer comprises an acrylic copolymer resin having a solution acid value of from 0.2 mg KOH/g to 2 mg KOH/g
Implementation Method 2
a heat resistant slip layer provided on one side of the substrate sheet
Implementation Method 3
an adhesive layer provided on the peel layer in this order from the substrate sheet side
Data Source
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AI summary
According to a first aspect of the present invention, there is provided a protective layer transfer sheet comprising: a substrate sheet; a heat resistant slip layer provided on one side of the substrate sheet; and a thermally transferable protective layer provided on at least a part of the other side of the substrate sheet opposite to the one side where the heat resistant slip layer is provided, the protective layer comprising a peel layer, a primer layer, and an adhesive layer formed in this order from the substrate sheet side, and the peel layer being formed of an acrylic copolymer resin having a solution acid value of 2 or less.