Polycarbonate Composite Lamination Using Geminal Diol Derivative Primer
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Solution Overview
Problem
The existing methods for laminating polymer layers, particularly those involving intermediate layers, often result in delamination issues due to incompatibility between the intermediate layer and the polycarbonate polymer layers, leading to structural integrity and durability concerns in security and value documents.
Innovation Solution
A method involving the application of a polycarbonate derivative based on geminally disubstituted dihydroxydiphenyl cycloalkane as a solvent mixture on the intermediate layer, ensuring compatibility and adhesion between the intermediate and polycarbonate layers, followed by lamination under controlled temperature and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an intermediate layer is applied between polymer layers, then additional features such as security printing elements can be integrated, but delamination occurs between the intermediate layer and the second polymer layer due to incompatibility
Solution Approach 1:
A primer layer comprising a polycarbonate derivative is applied between the intermediate layer (printing layer) and the second polymer layer. This primer layer acts as a mediator that ensures compatibility and adhesion between the printing layer and the polycarbonate film, preventing delamination while allowing security features to be integrated.
Solution Approach 2:
The invention changes the chemical composition parameter by using a polycarbonate derivative in the primer layer that is compatible with both the printing layer and the polycarbonate film. This parameter change in material composition resolves the incompatibility issue causing delamination.
2Adaptability or versatility
If printing layers are applied on polymer layers, then security features are enhanced, but the printing layer obstructs the mixture of softened polymer layers during lamination
Solution Approach 1:
The primer layer serves as an intermediary that allows the printing layer to coexist with the polymer layers during lamination. It enables the printing layer to be present without obstructing the mixture of softened polymer layers, thus maintaining the monolithic structure while preserving security printing capabilities.
Solution Approach 2:
The primer layer is applied locally at the boundary between the printing layer and the polycarbonate film, providing targeted compatibility enhancement only where needed for adhesion, while allowing the rest of the structure to maintain its intended properties.
3Reliability
If a primer layer comprising a polycarbonate derivative is applied, then adhesion between intermediate and polymer layers is improved, but an additional processing step is required
Solution Approach 1:
The primer layer is designed to be self-adhering to both the printing layer and the polycarbonate film through its polycarbonate derivative composition. This self-service property reduces the need for additional adhesion-promoting treatments or complex multi-step processes, making the additional step more efficient.
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
This approach enhances the structural integrity and durability of the laminated structure by forming a monolithic bond between the polycarbonate layers, preventing delamination and allowing for the use of various intermediate materials, including printing and photographic layers, while maintaining the security features of the documents.
Implementation Method 1
a close connection between the polymer layers is produced under pressure at a temperature, which is above the softening point (glass point) of the polymer layers, by that the polymer chains being movable above the glass point mix with each other
Implementation Method 2
the first polymer layer and the second polymer layer are laminated with each other under pressure, at an increased temperature and for a defined time
Implementation Method 3
the first polymer layer and the second polymer layer are laminated with each other under pressure, at an increased temperature and for a defined time
Data Source
AI summary
The invention relates to a method for making a structure with at least a first polymer layer and a second polymer layer, each made from a polycarbonate polymer based on bisphenol A, and in between the first polymer layer and the second polymer layer an intermediate layer being arranged, comprising the following steps: a) the intermediate layer is applied at least on a partial region of the first polymer layer, b) optionally the intermediate layer is dried, c) the first polymer layer is coated on the side, on which the intermediate layer is arranged, with a liquid preparation comprising a solvent or a mixture of solvents and a polycarbonate derivative based on a geminally disubstituted dihydroxydiphenyl cycloalkane, the preparation covering the intermediate layer, d) optionally a drying step is made after step c), e) after step c) or step d), the second polymer layer is placed on the first polymer layer, covering the intermediate layer, f) the first polymer layer and the second polymer layer are laminated with each other under pressure, at a temperature from 120° C. to 230° C. and for a defined time.