Aqueous Ink Polymer Composition for Adhesion to Polyolefin Films
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Solution Overview
Problem
Inkjet printing on polyolefin-based materials, such as polypropylene films, results in insufficient adhesion of the printed image, despite the use of existing aqueous ink compositions.
Innovation Solution
A polymer containing a structure derived from a specific polymerizable monomer, represented by Formula (1), is used as a constituent unit, which enhances adhesion to polyolefin materials, and is incorporated into resin particles and aqueous inks to improve image adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional aqueous ink compositions are used for inkjet printing on polyolefin materials, then the printing process can be performed, but the adhesion of the printed image is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the binder resin by specifying precise compositional ratios (component A: 30-70 mass%, component B: 30-70 mass%, component C: 1-20 mass%) to achieve optimal adhesion to polyolefin surfaces. This parameter optimization resolves the contradiction by tuning the resin composition to be compatible with polyolefin while maintaining strong image adhesion.
Solution Approach 2:
The patent creates a composite binder resin system combining multiple resin components (A, B, and C) with specific functional characteristics. Component A provides adhesion, component B provides flexibility and film formation, and component C enhances compatibility with polyolefin. This composite approach resolves the contradiction by integrating multiple functions into a single binder system that works effectively on polyolefin substrates.
2Reliability
If back printing with lamination is used to improve image adhesion and durability, then printing quality improves, but work efficiency decreases and environmental burden increases due to adhesive and solvent use
Solution Approach 1:
The patent extracts and eliminates the need for separate lamination adhesive layers by incorporating adhesion-promoting functionality directly into the binder resin composition. The resin itself provides sufficient adhesion to polyolefin, removing the requirement for additional adhesive materials and lamination steps, thereby improving productivity while maintaining reliability.
Solution Approach 2:
The binder resin is designed to perform multiple functions simultaneously: it acts as the binding agent for pigment particles, provides adhesion to the polyolefin substrate, ensures flexible film formation, and enables durable printed images. This multi-functionality eliminates the need for separate adhesive layers, resolving the contradiction between reliability and productivity.
3Reliability
If solvent-based inks are used to achieve good printing performance, then printing quality improves, but environmental burden increases
Solution Approach 1:
The patent changes the solvent system parameter from organic solvents to water as the primary solvent, creating an aqueous ink composition. This parameter change maintains printing performance through optimized binder resin composition while significantly reducing environmental burden by eliminating volatile organic compounds (VOCs) associated with solvent-based inks.
Data Source
AI summary
An object is to provide a polymer excellent in adhesion to a base material made of a polyolefin. The object is achieved by using a polymer including, as a constituent unit, a structure derived from a polymerizable monomer (M) represented by Formula (1) described below: (In the formula, A1 represents a hydrocarbon group containing two or more aromatic ring skeletons, the hydrocarbon group optionally has a substituent, and the substituent is a nonionic substituent. A2 represents an alkylene chain having from 1 to 10 carbons, and the alkylene chain optionally has a substituent. A plurality of A2 may be the same or different. n is an integer of from 3 to 100. X1 represents a group having an ethylenically unsaturated double bond.) A1-(OA2)n-O-X1 (1)