Recording Sheet Surface Treatment Layer Adhesion
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Solution Overview
Problem
The adhesion property, particularly the water-resistant adhesion property, of the surface treatment layer in recording sheets used for electrophotographic printing with liquid toners is insufficient, leading to peeling of the printed image during lamination, and increasing the crosslinking agent to improve adhesion deteriorates the transfer property and printability.
Innovation Solution
A recording sheet with a surface treatment layer formed using a coating solution containing an olefin copolymer emulsion and a silane coupling agent, where the silane coupling agent is crosslinked with the olefin copolymer to enhance adhesion between the support and the surface treatment layer, maintaining printability while improving water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of crosslinking agent is increased to improve adhesion property to the support, then the adhesion property is improved, but the transfer property of the toner is deteriorated
Solution Approach 1:
The patent optimizes the concentration of silane coupling agent (crosslinking agent) in the coating solution to achieve the right balance. By controlling the amount of crosslinking agent and the crosslinking conditions, the invention achieves sufficient adhesion strength while maintaining the surface properties needed for proper toner transfer, thus resolving the contradiction between adhesion improvement and transfer property preservation
Solution Approach 2:
The patent uses a composite coating solution containing both olefin copolymer emulsion and silane coupling agent. This composite formulation allows the olefin copolymer to provide good toner transfer properties while the silane coupling agent provides crosslinking for adhesion strength, thus achieving both requirements simultaneously through material composition rather than relying solely on increasing crosslinking agent amount
2Strength
If the amount of crosslinking agent is increased to improve adhesion property, then the adhesion property is improved, but the printability is deteriorated
Solution Approach 1:
The patent carefully controls the concentration of silane coupling agent and the crosslinking conditions (temperature, time) to optimize both adhesion and printability. By adjusting these parameters within specific ranges, the invention achieves strong adhesion while maintaining the surface characteristics necessary for high-quality printing, thus resolving the contradiction between adhesion strength and printability
3Strength
If a surface treatment layer is added to improve adhesion, then adhesion property is improved, but the structure becomes more complex
Solution Approach 1:
The patent combines the adhesion promoter function and the toner reception function into a single integrated surface treatment layer. By incorporating silane coupling agent within the olefin copolymer-based coating layer, the invention achieves both adhesion to the support and good toner transfer properties in one layer, thus improving adhesion without significantly increasing structural complexity
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 recording sheet achieves high adhesion between the support and surface treatment layers, preventing toner drop-off during electrophotographic printing and maintaining high water resistance in various printing processes, including offset and flexographic printing.
Implementation Method 1
the thermoplastic resin constituting the support and the olefin copolymer constituting the surface treatment layer may be crosslinked, and the olefin copolymers may be crosslinked to each other
Data Source
AI summary
A recording sheet is produced by coating and drying on a support formed of a thermoplastic resin film a coating solution containing an olefin copolymer emulsion having a solid content of 100 parts by mass and a silane coupling agent having a solid content of from 2 to 14 parts by mass to form a surface treatment layer having a solid content of from 0.1 to 5 g/m2. The recording sheet has high adhesion property between the support layer and the surface treatment layer, is capable of being subjected to various kinds of printing including offset printing and flexographic printing, and particularly has excellent adhesion property between the surface treatment layer and the toner to prevent the toner from being dropped off even in the case where the recording sheet is subjected to an electrophotographic recording printing process using a liquid toner.