Stretch Blow-Molded Toner Bottle Composition to Prevent Wax Transfer

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Solution Overview

Problem

The use of material recycled polystyrene (MR-HIPS) in toner bottles leads to reduced molecular weight, increased environmental load, and potential chemical attack on toner due to wax transfer during stretch blow molding, causing image density non-uniformity in electrophotographic images.

Innovation Solution

Incorporating inorganic layered double hydroxides and zeolites into the styrene-based resin composition to adsorb and prevent wax transfer, thereby preventing chemical attack on toner particles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If material recycled polystyrene (MR-HIPS) is used in toner bottles, then environmental protection is improved through recycling, but the molecular weight is reduced and impact strength deteriorates

Engineering Contradiction:

Improveenvironmental loadVSAvoidimpact strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent changes the chemical parameters of the recycled polystyrene by introducing a carbodiimide compound that reacts with oxidized groups on polymer chains. This chemical modification restores the molecular weight and impact strength of MR-HIPS while maintaining its recyclability, thus resolving the contradiction between environmental protection and material strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system by combining MR-HIPS with a carbodiimide compound (such as N,N'-carbonyldiimidazole). This composite approach allows the recycled material to regain its mechanical properties through the chemical interaction between the carbodiimide and oxidized polymer chains, thereby maintaining both environmental benefits and structural integrity

Inventive Principle:

Principle #40Composite materials

2Ease of repair

If material recycled polystyrene is used in toner bottles, then recycling is promoted, but blow molding defects increase due to variation in stretchability

Engineering Contradiction:

ImproverecyclabilityVSAvoidblow molding quality

Core Design Contradiction:

Ease of repairVSManufacturing precision

Solution Approach 1:

The patent modifies the molecular weight distribution parameters of MR-HIPS through chemical reaction with carbodiimide compounds. This restores the uniformity of polymer chain lengths, thereby improving stretchability consistency and eliminating blow molding defects while maintaining recyclability

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If virgin materials are mixed to compensate for defects in material recycled product, then manufacturing quality is improved, but the use ratio of recycled material is reduced

Engineering Contradiction:

Improveproduct qualityVSAvoidrecycled material usage ratio

Core Design Contradiction:

Manufacturing precisionVSEase of repair

Solution Approach 1:

The patent changes the chemical state of recycled materials through carbodiimide treatment, transforming degraded MR-HIPS into a material with restored properties. This allows 100% recycled content to achieve the same quality as virgin or mixed materials, thereby maximizing recycled material usage while maintaining product quality

Inventive Principle:

Principle #35Parameter changes

4Ease of manufacture

If wax is present in styrene-based resin during stretch blow molding, then resin processability is improved, but wax transfers to the surface causing chemical attack on toner

Engineering Contradiction:

Improveresin processabilityVSAvoidchemical attack on toner

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an intermediary substance (carbodiimide compound or its reaction product) that mediates between the wax and the toner. This intermediary forms a protective layer or chemical barrier that prevents direct contact between the wax and toner particles, thereby maintaining processability while preventing chemical attack

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful effect of wax by having it react with the carbodiimide compound to form imidazole carboxylic acid or similar products. This chemical transformation converts the harmful wax into a beneficial protective layer that actually protects the toner from chemical attack while maintaining manufacturing ease

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Prevents wax transfer to the surface of the blow-molded article, maintaining toner integrity and ensuring uniform image density in electrophotographic images while reducing environmental impact.

Implementation Method 1

Incorporating inorganic layered double hydroxides and zeolites into the styrene-based resin composition to adsorb and prevent wax transfer

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP4450253B1Stretch blow-molded article, toner bottle, and method for manufacturing stretch blow-molded article, molded article, and pellet

Publication Date: 2026.01.21 CANON KK

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AI summary

STRETCH BLOW-MOLDED ARTICLE, TONER BOTTLE, AND METHOD FOR MANUFACTURING STRETCH BLOW-MOLDED ARTICLE, MOLDED ARTICLE, AND PELLET A stretch blow-molded article comprising: at least one selected from the group consisting of an inorganic layered double hydroxide and zeolite; a styrene-based resin; and a wax.