Soil-Resistant Transfer Sheet for Molded Resin
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Solution Overview
Problem
Existing soil-resistant transfer sheets for molded resin articles, such as optical and automobile parts, face challenges in achieving sufficient surface hardness, adhesiveness, and durability, particularly in preventing fingerprint adherence and ensuring effective mold release without damaging the soil-resistant layer.
Innovation Solution
A soil-resistant transfer sheet comprising a substrate sheet, a soil-resistant layer with a fluorine-containing compound having a polymerizable double bond, and a coating layer formed from polymerizable monomers like acrylates, vinyl alcohols, or vinyl ethers, which provides a contact angle of 100° or higher with water and 40° or higher with hexadecane, ensuring excellent anti-adhesive and mold releasing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fluorine-containing resin film is introduced on the outermost layer to provide soil-resistant properties, then anti-fingerprint performance is improved, but surface hardness and adhesiveness deteriorate
Solution Approach 1:
The invention uses a composite structure consisting of a substrate sheet, a soil-resistant layer containing fluorine-containing compound, and a coating layer. This composite material approach allows the fluorine-containing layer to provide soil resistance while the coating layer maintains surface hardness and durability, resolving the contradiction between anti-fingerprint performance and surface strength.
2Object-affected harmful factors
If a fluorine-containing resin film is introduced on the outermost layer to provide soil-resistant properties, then anti-fingerprint performance is improved, but adhesiveness deteriorates
Solution Approach 1:
The composite structure with substrate sheet, soil-resistant layer, and coating layer enables the fluorine-containing soil-resistant layer to provide anti-fingerprint properties while the coating layer ensures adequate adhesiveness and durability, resolving the contradiction between soil resistance and adhesiveness.
3Ease of operation
If the release property of the substrate sheet from the soil-resistant layer is low after transferring, then mold release becomes difficult, but the soil-resistant layer may be destroyed during release
Solution Approach 1:
The invention divides the transfer sheet into distinct functional layers: a substrate sheet and a soil-resistant layer. This segmentation allows the substrate sheet to be easily separated from the soil-resistant layer after transfer, enabling good mold release properties while preserving the integrity of the soil-resistant layer.
Solution Approach 2:
The substrate sheet is designed with preliminary release properties that facilitate easy separation from the soil-resistant layer after the transfer process. This preliminary action ensures that mold release can be performed without destroying the soil-resistant layer, resolving the contradiction between release ease and layer integrity.
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 a transfer sheet with enhanced soil-resistant properties, including improved anti-fingerprint performance and mold release capabilities, resulting in a durable and effective soil-resistant molded resin article.
Implementation Method 1
a soil-resistant layer (b), which is a layer obtained from a soil-resistant composition comprising a fluorine-containing compound having a polymerizable double bond
Implementation Method 2
the coating layer (c) is formed from a polymerizable coating monomer or resin
Data Source
Figure 1
AI summary
A soil-resistant transfer sheet which comprises, in the following order, a substrate sheet (a), a soil-resistant layer (b), a coating layer (c), and optionally an adhesive layer (d), wherein a surface of the soil-resistant layer, which reveals after the substrate sheet (a) is removed, has a contact angle with water of 100° or larger and a contact angle with hexadecane of 40° or larger; a process for producing a molded resin by in-mold labeling using the transfer sheet. The soil-resistant layer (b) is a layer obtained from a soil-resistant composition, and the coating layer (c) is a layer obtained from a polymerizable coating composition. The soil-resistant composition especially preferably is a perfluoropolyether urethane acrylate composition.