Binder Resin Composition for Toner Fixing on Polypropylene Films
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Solution Overview
Problem
Conventional toners struggle to achieve excellent fixing properties on polypropylene films due to differences in polarity and surface conditions compared to paper, leading to poor adhesion and stability.
Innovation Solution
A binder resin composition comprising an amorphous polyester resin with a modified polypropylene polymer A-derived constituent moiety, where the polymer A is terminally modified with a carboxylic acid or anhydride group, bonded via a covalent link, enhancing intermolecular interactions with polypropylene films for improved fixing, storability, and offset resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polyester resin is used for toner binder, then general fixing property on paper is maintained, but fixing property on polypropylene films deteriorates due to polarity differences
Solution Approach 1:
The patent creates a composite binder resin by chemically bonding polyester resin (for paper compatibility) with polypropylene polymer (for polypropylene film compatibility) through covalent bonds formed via carboxylic acid or carboxylic anhydride groups. This composite structure enables the single binder resin to effectively fix toner on both paper and polypropylene film substrates, resolving the substrate compatibility issue.
2Reliability
If polypropylene wax is added to improve fixing on polypropylene film, then fixing property improves, but storability and offset resistance deteriorate
Solution Approach 1:
The patent changes the chemical structure parameter of the polypropylene component by using polypropylene polymer with carboxylic acid or carboxylic anhydride groups instead of conventional polypropylene wax. This structural modification enables covalent bonding with polyester resin, creating a stable composite that maintains storability and offset resistance while achieving improved fixing on polypropylene films.
3Reliability
If binder resin is optimized for paper printing, then paper fixing property is maintained, but adhesion to polypropylene film deteriorates
Solution Approach 1:
The patent designs a universal binder resin that performs multiple functions: the polyester resin component ensures good fixing on paper substrates, while the polypropylene polymer component with carboxylic acid/anhydride groups provides strong adhesion to polypropylene films through covalent bonding. This multi-functional design allows the same binder resin to effectively work on both paper and polypropylene film without compromising either substrate's fixing property.
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 binder resin composition significantly enhances the fixing property, storability, and offset resistance of toners on polypropylene films, ensuring better adhesion and durability during printing.
Implementation Method 1
a modified polypropylene polymer A-derived constituent moiety that is a constituent moiety derived from a modified polypropylene polymer A having a carboxylic acid group or a carboxylic anhydride group and in which the polyester resin-derived constituent moiety and the modified polypropylene polymer A-derived constituent moiety bond to each other via a covalent bond
Data Source
AI summary
The present invention relates to a binder resin composition capable of giving a toner remarkably excellent in fusing property on polypropylene films, and to a toner for developing electrostatic images that contains the binder resin composition. [1] A binder resin composition for toners, containing an amorphous polyester resin which has a polyester resin-derived constituent moiety that is a constituent moiety derived from a polyester resin and a modified polypropylene polymer A-derived constituent moiety that is a constituent moiety derived from a modified polypropylene polymer A having a carboxylic acid group or a carboxylic anhydride group and in which the polyester resin-derived constituent moiety and the modified polypropylene polymer A-derived constituent moiety bond to each other via a covalent bond, wherein the polymer A is a polypropylene polymer terminally-modified with an unsaturated bond-having carboxylic acid compound or an anhydride thereof, and in the polyester resin, the amount of the polymer A-derived constituent unit is 8 parts by mass or more and 30 parts by mass or less relative to 100 parts by mass of the total of the alcohol component and the carboxylic acid component constituting the polyester resin-derived constituent moiety; and [2] a toner for developing electrostatic images, containing the binder resin composition of [1].