Resin-Coated Recording Material for Laser Printing
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Solution Overview
Problem
Current recording materials for electrophotographic processes, particularly in laser printing, face issues with toner fixation, light and ozone stability, and stackability, especially when used for producing photo books, which require improved color density and handling in printing devices.
Innovation Solution
A recording material with a raw paper coated on both sides by a synthetic resin and featuring a toner-absorbing layer composed of a polymer combination of ethylene-acrylic acid copolymer, carboxylated acrylic copolymer, and another polymer with specific melting points, along with an antistatic agent, to enhance toner reception and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coated satin papers are used for electrophotographic printing to produce photo books, then both-sided printing capability is achieved, but image quality deteriorates in terms of color density, light and ozone stability
Solution Approach 1:
The patent applies composite materials by combining multiple polymer components in the toner-absorbing layer: a thermoplastic polymer (polyethylene or polypropylene), a polymer with carboxyl groups (for toner adhesion), and an antistatic agent. This composite structure enables both-sided printing capability while maintaining high image quality, color density, and stability against light and ozone, resolving the contradiction between versatility and reliability.
2Ease of operation
If conventional resin-coated papers are used, then basic printing functionality is achieved, but toner fixation deteriorates and behavior in printer worsens
Solution Approach 1:
The patent changes key parameters of the toner-absorbing layer: incorporating polymers with specific functional groups (carboxyl groups for toner adhesion), controlling surface properties through antistatic agents, and optimizing polymer composition ratios. These parameter changes improve toner fixation and printer behavior while maintaining basic printing functionality.
Solution Approach 2:
The patent uses composite materials in the toner-absorbing layer combining thermoplastic polymers, carboxyl-containing polymers, and antistatic agents. This composite structure enhances toner fixation and overall printer behavior beyond what conventional single-material resin-coated papers can achieve.
3Productivity
If printed papers are stacked or covered immediately after printing, then storage efficiency is improved, but toner particles rub off undesirably
Solution Approach 1:
The patent changes surface parameters of the toner-absorbing layer by incorporating antistatic agents and polymers with specific surface properties. These parameter changes increase friction and adhesion between the toner and substrate, preventing toner particles from rubbing off during stacking or covering, thus enabling efficient storage without compromising image integrity.
Solution Approach 2:
The patent converts the potential harm of toner transfer during stacking into a benefit by using antistatic agents that increase surface friction. The same surface properties that could potentially cause static-related issues are instead harnessed to improve toner adhesion and prevent unwanted transfer, allowing efficient stacking and storage.
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 improved image quality, light and ozone resistance, and better handling in printers and stackability, ensuring consistent performance and longevity of printed images.
Implementation Method 1
the polymer (C) has an average particle size d50 of 5 to 20 μm and a melting point that is above the melting range of the copolymer (A) and below the melting range of the copolymer (B)
Implementation Method 2
The polymer combination per se can be used as a toner-absorbing layer or as a component of a toner-absorbing layer, in particular together with an antistatic agent
Data Source
AI summary
Recording materials for electrophotographic methods, comprising a raw paper coated on both sides with a synthetic resin and a toner-sensitive layer, wherein the synthetic resin-coated paper has a specific surface topography, expressed as a roughness Rz of 1.5 to 13 µm, and an average Ra value of 0.05 to 2 µm, the toner-absorbing layer comprises a polymer combination of a toner-absorbing ethylene-acrylic acid copolymer (A), a carboxylated acrylic acid ester copolymer (B) and a polymer (C), and polymer (C) has an average particle size d50% of 5 to 20 µm and a melting point that is higher than the melting range of copolymer (A) and lower than the melting range of copolymer (B).