Pressure-Induced Phase Transition Particles for Printed Material Edge Peeling
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Solution Overview
Problem
Existing methods for producing pressure-bonded printed materials face issues with peeling at the peripheral edge portion, particularly when the image area ratio of the color image exceeds 20% due to degradation in adhesiveness, leading to unintended peeling upon impact.
Innovation Solution
A method involving the use of pressure-induced phase transition particles with a styrene resin and a (meth)acrylic acid ester resin, where the mass ratio of (meth)acrylic acid esters is 90% or more, and having at least two glass transition temperatures with a 30°C difference, is employed to form a color image with an image area ratio of 20% or less on the peripheral edge of the recording medium, enhancing adhesiveness and reducing peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the image area ratio of the color image in the peripheral edge portion exceeds 20%, then the printed material can contain more information, but peeling occurs at the peripheral edge portion due to degradation in adhesiveness
Solution Approach 1:
The patent applies different resin compositions to different regions of the pressure-induced phase transition particles. Specifically, particles containing both styrene resin and (meth)acrylic acid ester resin are used in the peripheral edge portion to maintain adhesiveness, while allowing higher image area ratios in these regions without causing peeling
Solution Approach 2:
The patent uses composite pressure-induced phase transition particles containing both styrene resin and (meth)acrylic acid ester resin in specific mass ratios. This composite material combines the properties of both resins to achieve both sufficient adhesiveness and acceptable image area ratios in the peripheral edge portion
2Ease of manufacture
If homopolymer (meth)acrylic acid ester resin particles are used, then the bonding process is simple, but peeling occurs at the peripheral edge portion when impact is applied
Solution Approach 1:
The patent replaces homopolymer (meth)acrylic acid ester resin particles with composite particles containing both styrene resin and (meth)acrylic acid ester resin. This composite material provides enhanced bonding strength that prevents peeling under impact while maintaining a relatively simple bonding process
Solution Approach 2:
The patent changes the chemical composition parameters of the pressure-induced phase transition particles by incorporating styrene resin alongside (meth)acrylic acid ester resin in specific mass ratios. This parameter change enhances the bonding strength and impact resistance of the peripheral edge portion
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 method effectively suppresses peeling at the peripheral edge portion of the pressure-bonded printed material by maintaining adhesiveness, even when subjected to impact, compared to using homopolymer (meth)acrylic acid ester resin particles.
Implementation Method 1
providing pressure-induced phase transition particles to a recording medium, a step of bonding the color image and the pressure-induced phase transition particles onto the recording medium
Implementation Method 2
The pressure-induced phase transition particles have at least two glass transition temperatures, and a difference between the lowest glass transition temperature and the highest glass transition temperature among the glass transition temperatures of the pressure-induced phase transition particles is 30° C. or more
Data Source
AI summary
A method for producing a printed material includes forming a color image having an image area ratio of 20% or less on a peripheral edge portion of a recording medium by using a coloring material; providing pressure-induced phase transition particles to a region of the recording medium, the region including the peripheral edge portion; bonding the color image and the pressure-induced phase transition particles onto the recording medium; and folding the recording medium having the color image and the pressure-induced phase transition particles bonded thereon and pressure-bonding the folded recording medium, or pressure-bonding the recording medium having the color image and the pressure-induced phase transition particles bonded thereon and another recording medium placed on top of each other. The pressure-induced phase transition particles contain a styrene resin and a (meth)acrylic acid ester resin, the styrene resin contains styrene and a vinyl monomer other than styrene as polymerization components, the (meth)acrylic acid ester resin contains at least two (meth)acrylic acid esters as polymerization components, and a mass ratio of the (meth)acrylic acid esters is 90 mass % or more of a total of all polymerization components of the (meth)acrylic acid ester resin. The pressure-induced phase transition particles have at least two glass transition temperatures, and a difference between the lowest glass transition temperature and the highest glass transition temperature among the glass transition temperatures of the pressure-induced phase transition particles is 30° C. or more.