Toner Composition for Polypropylene Film Adhesion
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Solution Overview
Problem
Conventional toners face challenges in achieving excellent fusing properties and rubfastness on polypropylene films, particularly for applications like PET bottle labels, where the difference in material polarity and surface conditions between paper and polypropylene films leads to poor adhesion and image durability.
Innovation Solution
A toner composition comprising an amorphous polyester-based resin and a crystalline polyester-based resin, where the amorphous resin includes a reactive functional group-modified polyolefin polymer bonded via a covalent bond, and the crystalline resin enhances intermolecular interactions for improved fusing and rubfastness, specifically designed to work effectively on polypropylene films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toners are used on polypropylene films, then general printing functionality is maintained, but fusing properties and image durability are poor due to material polarity differences
Solution Approach 1:
The invention changes the chemical composition parameters of the toner by incorporating modified polyolefin-based polymers with reactive functional groups that can chemically interact with polypropylene film surfaces, thereby improving adaptability to non-polar substrates while maintaining image durability
Solution Approach 2:
The invention uses a composite resin system combining polyester-based resins with modified polyolefin-based polymers, creating a multi-component material that leverages the benefits of both material types to achieve both reliability and adaptability
2Reliability
If polyester-based resins are used alone, then good general printing performance is achieved, but fusing properties on polypropylene films are insufficient
Solution Approach 1:
The invention creates a composite resin composition combining polyester-based resins with modified polyolefin-based polymers containing reactive functional groups, where the polyolefin component specifically enhances fusing properties on polypropylene films while the polyester provides general printing performance
Solution Approach 2:
The modified polyolefin-based polymer acts as an intermediary material that facilitates bonding between the polyester resin and the polypropylene film surface, using its reactive functional groups to bridge the compatibility gap between polar and non-polar materials
3Reliability
If standard toner formulations are used, then manufacturing simplicity is maintained, but rubfastness on polypropylene films is poor
Solution Approach 1:
The invention modifies the chemical parameters of the toner formulation by incorporating polymers with specific reactive functional groups that enhance rubfastness through chemical bonding mechanisms, while keeping the manufacturing process within industrially feasible parameters
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 exhibits enhanced fusing properties and increased rubfastness on polypropylene films, ensuring strong bonding and image durability even when subjected to rubbing, thereby addressing the limitations of existing toners.
Implementation Method 1
the amorphous polyester-based resin A has a constituent moiety derived from a polyester resin, and a constituent moiety derived from a reactive functional group-having modified polyolefin-based polymer A, the polyester resin-derived constituent moiety and the modified polyolefin-based polymer A-derived constituent moiety being bonded via a covalent bond
Data Source
AI summary
The invention relates to a toner for development of electrostatic images excellent in fusing property on polypropylene films and excellent in rubfastness of printed images, and a resin composition for a toner for development of electrostatic images. The toner for development of electrostatic images and the resin composition for a toner for development of electrostatic images each contain an amorphous polyester-based resin A and a crystalline polyester-based resin C, wherein the amorphous polyester-based resin A has a constituent moiety derived from a polyester resin, and a constituent moiety derived from a reactive functional group-having modified polyolefin-based polymer A, the polyester resin-derived constituent moiety and the modified polyolefin-based polymer A-derived constituent moiety being bonded via a covalent bond, and the amount of the modified polyolefin-based polymer A-derived constituent moiety is 5% by mass or more and 30% by mass or less relative to the total amount of the resin component in the toner.