Polyester Resin Ink for Polyolefin Adhesion
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Solution Overview
Problem
Existing ink compositions for deflected continuous ink jet printing on organic polymer substrates, such as polyolefins, require surface treatments like flame or corona treatment and include halogenated compounds to achieve satisfactory adherence and resistance, which is not practical for all applications.
Innovation Solution
An ink composition comprising a solvent, a binder with a specific polyester resin prepared from terephthalic acid, isophthalic acid, neopentyl glycol, and ethylene glycol, and optionally a resin derived from rosin or a polyol resin, which provides improved adherence and resistance to friction and solvents without the need for surface treatments or halogenated compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface treatments like flame or corona treatment are used, then adherence and resistance are improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts and eliminates the need for surface treatment equipment and halogenated compounds by formulating an ink composition that inherently provides adherence and resistance through specific binder chemistry, thereby simplifying the overall system while maintaining performance
Solution Approach 2:
The ink composition performs the function of surface treatment itself through its chemical composition, specifically the binder system that creates adhesion and resistance without requiring external treatment equipment or additional chemical additives
2Reliability
If halogenated compounds are included, then adherence and resistance are improved, but harmful factors increase
Solution Approach 1:
The patent converts the harmful halogenated compounds into beneficial non-halogenated alternatives by using a specific binder system that achieves the same adherence and resistance effects through different chemical mechanisms, thereby eliminating harmful substances while maintaining functionality
Solution Approach 2:
The patent changes the chemical composition parameters by replacing halogenated compounds with non-halogenated binder systems, specifically using a binder comprising a polyol and a polyester resin with specific characteristics that provide the required performance without harmful halogens
3Ease of operation
If ink composition is simplified without surface treatments, then ease of operation improves, but adherence and resistance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the ink composition by formulating a specific binder system comprising a polyol and a polyester resin with controlled molecular weight and functionality, which inherently provides adherence and resistance without requiring surface treatment processes
Solution Approach 2:
The patent uses a composite binder system combining a polyol and a polyester resin with specific characteristics to achieve synergistic effects that provide both ease of application and durable adherence and resistance without surface treatments
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 ink composition achieves higher adherence and resistance to friction and solvents on polyolefin substrates compared to prior art, without requiring surface treatments or halogenated compounds, ensuring reliable marking performance.
Implementation Method 1
The piezo-electric crystal, vibrating at a determined frequency, causes pressure perturbations in the ink jet
Implementation Method 2
An electrode, placed on the path of the jet, there where it breaks up, gives the possibility of giving these drops an electrostatic charge, if the ink is conductive. The thereby charged drops are deflected in an electric field and allow printing.
Implementation Method 3
The ingredients which make up present inks, for the ink jet of the deflected continuous jet type, are organic or mineral products; these are coloring materials, such as coloring agents or pigments, resins or binders, in more or less volatile solvent(s) or in water
Implementation Method 4
The solvents of these inks most frequently consist of a mixture comprising in majority an amount of volatile and not very viscous solvents on the one hand in order to allow very rapid drying of the markings
Data Source
AI summary
An ink composition for deflected continuous ink jet printing, liquid at room temperature, comprising: a) a solvent comprising, preferably consisting of, one or several organic solvent compound(s) and optionally water; b) a binder, comprising at least one polyester resin prepared by polymerization of terephthalic acid, isophthalic acid, neopentylglycol, and ethyleneglycol; c) optionally one or several dye(s) and/or pigment(s). A method for marking a substrate, support or object by projecting on a surface of this substrate, support, or object this ink composition. A substrate, support or object, notably a bottle, flask, tray, stopper, cable or pipe made of polyolefin, for example made of polyethylene or made of polypropylene, provided with a marking obtained by drying, and/or absorption into the substrate, support or object, of this ink composition.