Two-Component Color Developer Toner Resistivity and Carrier Durability

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Solution Overview

Problem

Existing two-component color developers do not adequately address the issue of coat durability for carriers, leading to instability against environmental variations, toner scattering, and white spots in image formation.

Innovation Solution

A two-component color developer comprising a toner with a polyester resin binding agent, organic pigment, and negatively polarized inorganic fine particles, combined with a resin-coated carrier having high coat durability, ensuring stability and preventing toner scattering and white spots.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional two-component color developers are used, then image formation can be performed, but the carrier coat durability is insufficient leading to instability against environmental variation

Engineering Contradiction:

Improvestability against environmental variationVSAvoidcarrier coat durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies parameter changes by carefully controlling the volume resistivity of the toner within the specific range of 40×10^9 to 220×10^9 Ωcm and the coat durability of the carrier at 90% or greater. These parameter optimizations resolve the contradiction by ensuring stable electrical properties that maintain reliable image formation while preserving carrier coat integrity under environmental variations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining a polyester resin-based toner with negatively polarized inorganic fine particles and a resin-coated carrier. This composite structure enhances both the reliability against environmental variation and the carrier coat durability, as the resin coating on the carrier provides protective functionality while the toner composition ensures stable charge properties.

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional two-component color developers are used, then image formation can be performed, but toner scattering occurs

Engineering Contradiction:

Improveimage formation capabilityVSAvoidtoner scattering

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent resolves toner scattering by optimizing the volume resistivity parameter of the toner to within 40×10^9 to 220×10^9 Ωcm. This parameter control ensures that the toner maintains appropriate electrical charge, preventing excessive repulsion that would cause scattering while still enabling effective image formation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a polyester resin as the binding resin in the toner, which provides adequate performance for the application while being cost-effective. The toner is designed as a consumable material that delivers reliable image formation without scattering issues during its service life.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If conventional two-component color developers are used, then image formation can be performed, but white spots are generated in images

Engineering Contradiction:

Improveimage formation capabilityVSAvoidimage quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent eliminates white spot defects by controlling the volume resistivity of the toner within the optimal range of 40×10^9 to 220×10^9 Ωcm and ensuring the carrier coat durability is 90% or greater. These parameter specifications prevent the electrical and physical conditions that would otherwise cause white spots, thereby achieving both image formation capability and high image quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent incorporates feedback mechanisms by specifying precise performance criteria for the toner and carrier interactions. The volume resistivity and coat durability parameters serve as feedback-controlled variables that ensure consistent image quality without white spots, allowing for reliable manufacturing precision.

Inventive Principle:

Principle #23Feedback

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 a stable two-component color developer that maintains performance across environmental variations, preventing toner scattering and white spots, particularly when using magenta or yellow pigments with specific molecular weight ranges and resistivity values.

Implementation Method 1

the toner containing at least a polyester resin as a binding resin, an organic pigment as a colorant and inorganic fine particles as an external additive, wherein the inorganic fine particles have a negative polarity, the toner has a volume resistivity of 40×10^9 to 220×10^9 Ωcm and a negative polarity

Methodology Applied

Scientific EffectElectrostatic charge: Electrostatics

Data Source

PatentUS9274447B2Two-component color developer and image formation device using same

Publication Date: 2016.03.01 SHARP KK

AI summary

A two-component color developer containing a toner and a resin-coated carrier, the toner containing at least a polyester resin as a binding resin, an organic pigment as a colorant and inorganic fine particles as an external additive, wherein the inorganic fine particles have a negative polarity, the toner has a volume resistivity of 40×109 to 220×109 Ωcm and a negative polarity, and the carrier has a coat durability of 90% or greater.