Toner Binder Composition for Blocking-Resistant Roll Media Printing
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Solution Overview
Problem
The blocking phenomenon occurs when long image-formed products are wound and stored in a roll shape, leading to toner peeling off during unwinding, particularly on recording media with high air permeance.
Innovation Solution
An electrostatic charge image developing toner is formulated with a binder resin comprising a styrene-(meth)acrylic resin and polyester in a specific mass ratio, used on recording media with high air permeance to reduce electrostatic attractive forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional toner is used on long recording media with high air permeance, then the image can be formed on the recording medium, but the blocking phenomenon occurs and toner peels off during unwinding
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin by specifying a mass ratio of polyester resin (5-50 mass%) combined with styrene resin and (meth)acrylic resin. This parameter change modifies the toner's electrostatic properties and adhesion characteristics, enabling effective charge release while maintaining image formation quality on high air permeance recording media.
Solution Approach 2:
The invention uses a composite binder resin system combining polyester resin with styrene resin and (meth)acrylic resin in specific proportions. This composite material approach creates synergistic effects where the polyester component facilitates charge release while the styrene and (meth)acrylic resins provide adhesion and image formation stability, preventing the blocking phenomenon.
2Strength
If the adhesive force between the image layer and recording medium is strengthened to prevent toner peeling, then toner adhesion improves, but the blocking phenomenon becomes more likely to occur during rolling and storage
Solution Approach 1:
The invention modifies the adhesive properties by changing the binder resin composition to include polyester resin (5-50 mass%) combined with styrene and (meth)acrylic resins. This parameter change creates a balanced adhesive force that is sufficient for image formation but allows controlled charge release during rolling, preventing the blocking phenomenon while maintaining toner adhesion.
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 toner configuration minimizes the blocking phenomenon by effectively releasing residual charges, ensuring smooth unwinding and reducing adhesive forces between the image layer and the recording medium.
Implementation Method 1
the blocking phenomenon can be reduced by releasing the negative charges of the image layer to the outside of the image layer to reduce the residual charge amount
Data Source
AI summary
Provided is an electrostatic charge image developing toner including toner base particles containing a binder resin. The binder resin contains a styrene-(meth)acrylic resin and a polyester. A mass ratio of the styrene-(meth)acrylic resin to the polyester is in a range of 80:20 to 1:99. The electrostatic charge image developing toner is used for forming an image on a recording medium that is long and has an air permeance of 20,000 sec or more at a temperature of 25° C. and a pressure of 49.03 hPa.