Protective Layer Transfer Sheet for Dyeable Prints
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Solution Overview
Problem
Existing protective layer transfer sheets lack sufficient dyeability and releasability, leading to issues such as abnormal transfer and breakage of dye layers when forming images on them, and they do not provide adequate plasticizer resistance, which can result in durability problems.
Innovation Solution
A protective layer transfer sheet comprising a substrate with a protective layer containing cellulose esters and vinyl chloride-vinyl acetate copolymers, where the binder resins have specific molecular weight ranges and ratios, along with polyethylene wax and a fluorinated resin, to enhance dyeability, releasability, and plasticizer resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective layers are used to improve plasticizer resistance, then durability is improved, but dyeability and releasability deteriorate
Solution Approach 1:
The protective layer uses a composite binder system combining cellulose acetate butyrate (CAB) resin and polyvinyl butyral (PVB) resin in specific ratios (CAB 10-30 parts, PVB 70-90 parts). This composite material approach allows the layer to simultaneously achieve plasticizer resistance through CAB and good dyeability/releasability through PVB, resolving the contradiction between durability and adaptability.
2Reliability
If protective layer is transferred onto print, then durability is improved, but abnormal transfer and breakage of dye layer occur due to insufficient releasability
Solution Approach 1:
The invention changes the chemical composition parameters of the protective layer by using specific resin types (CAB and PVB) and their precise ratios, along with controlled plasticizer content (5-20 parts). These parameter changes optimize the balance between adhesion to substrate and releasability from dye layer, preventing abnormal transfer and breakage while maintaining durability.
3Reliability
If high molecular weight cellulose ester is used to improve plasticizer resistance, then durability is improved, but dyeability deteriorates
Solution Approach 1:
The invention applies local quality by using cellulose acetate butyrate with a specifically controlled number average molecular weight of 10,000-30,000. This localized optimization of molecular weight in the CAB resin provides sufficient plasticizer resistance while maintaining adequate dyeability, avoiding the need for high molecular weight materials that would compromise dyeability.
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 allows for successful image formation on the protective layer without abnormal transfer or breakage, while providing satisfactory plasticizer resistance and improved abrasion resistance, ensuring the durability and quality of the printed images.
Implementation Method 1
the protective layer comprises (A) one or both of a cellulose ester having a number average molecular weight (Mn) of not less than 15000 and not more than 30000 and a vinyl chloride - vinyl acetate copolymer having a number average molecular weight (Mn) of not less than 15000 and not more than 30000
Implementation Method 2
the protective layer is transferred onto the print by using a thermal head or heating roll or the like
Data Source
Figure 1~2
AI summary
Provided is a protective layer transfer sheet which comprises a protective layer, whereby it becomes possible to form an image on the protective layer set on a print without causing the abnormal transfer of a dye layer, the breakage of the dye layer and the like, and it also becomes possible to achieve a satisfactory level of plasticizer resistance of the print. The protective layer transfer sheet (10) comprising a substrate (1) and a protective layer (2) peelably formed on the substrate, wherein the protective layer (2) comprises one or both of a cellulose ester having a number average molecular weight (Mn) of not less than 15000 and not more than 30000 and a vinyl chloride - vinyl acetate copolymer having a number average molecular weight (Mn) of not less than 15000 and not more than 30000, and (B) a cellulose ester having a number average molecular weight (Mn) of not more than 7000, wherein the ratio of the total content of the components (A) and (B) to the total solid content in the protective layer is not less than 70 % by mass, and the ratio of the content of the component (B) to the total mass of the components (A) and (B) is not less than 10 % by mass and not more than 30 % by mass.