Transfer Decorative Sheet With Pitch Gradient Cholesteric Liquid Crystal Layers
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Solution Overview
Problem
Transfer-type decorative sheets with cholesteric liquid crystal layers face challenges in achieving excellent peelability from temporary supports and maintaining glossiness, especially when viewed from oblique directions.
Innovation Solution
A transfer-type decorative sheet configuration featuring a temporary support, an underlayer with a monomer composition containing one or two polymerizable groups, and a cholesteric liquid crystal layer with a pitch gradient structure, where the underlayer has a water contact angle of 50° or more and a cyclic monomer structure, enhancing peelability and glossiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an undercoat layer and cholesteric liquid crystal layer are disposed on a temporary support, then the decorative layer can be transferred to various objects, but the temporary support has difficulty in peeling and has insufficient peelability
Solution Approach 1:
The patent divides the decorative layer into multiple sub-layers (first cholesteric liquid crystal layer, second cholesteric liquid crystal layer, and third cholesteric liquid crystal layer with different pitch gradient structures). This segmentation allows each layer to contribute differently to both transferability and peelability, resolving the contradiction between these two properties
Solution Approach 2:
The patent uses composite material structures combining multiple cholesteric liquid crystal layers with different pitch gradients and a specific undercoat layer configuration. This composite structure enables the decorative layer to maintain excellent transferability while achieving sufficient peelability from the temporary support
2Adaptability or versatility
If the decorative layer is made thin for various applications, then it can be transferred to various objects, but it becomes difficult to maintain excellent glossiness especially from oblique directions
Solution Approach 1:
The patent applies different pitch gradient structures to different regions of the cholesteric liquid crystal layers. The first and second layers have one pitch gradient structure while the third layer has a different pitch gradient structure, creating local quality variations that enhance glossiness from oblique directions while maintaining thin overall thickness for broad applicability
Solution Approach 2:
The patent introduces pitch gradient variations in the thickness direction of the cholesteric liquid crystal layers, adding a dimensional aspect to the structure. This dimensional change enables the thin decorative layer to exhibit excellent glossiness from oblique directions through constructive interference of reflected light
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 decorative sheet with improved peelability from the temporary support and enhanced glossiness when viewed from oblique angles, ensuring effective transfer and aesthetic appeal.
Implementation Method 1
A cholesteric liquid crystal layer obtained by immobilizing a cholesteric liquid crystalline phase is known as a layer having properties in which at least either right circularly polarized light or left circularly polarized light in a specific wavelength range is selectively reflected
Implementation Method 2
the underlayer is a layer that is formed of a composition including a monomer having one or two polymerizable groups, and a water contact angle of the underlayer is 50° or more
Data Source
AI summary
Provided are a transfer-type decorative sheet and a method of manufacturing a transfer-type decorative sheet, the transfer-type decorative sheet including a decorative layer that has excellent peelability from a temporary support and excellent glossiness in case of being seen from an oblique direction. The transfer-type decorative sheet includes: a temporary support; an underlayer that is peelable from and disposed on one surface of the temporary support; and a decorative layer that is disposed on the underlayer, in which the decorative layer includes at least one cholesteric liquid crystal layer, the underlayer is a layer that is formed of a composition including a monomer having one or two polymerizable groups, and a water contact angle of the underlayer is 50° or more.