Inkjet Pretreatment Liquid Composition for Boiling-Resistant Laminates
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Solution Overview
Problem
Existing pretreatment liquids for ink jet inks do not adequately address the need for improved boiling resistance and storage stability in laminates produced on impermeable base materials, particularly when used in conjunction with ink jet inks.
Innovation Solution
A pretreatment liquid for ink jet inks containing a coagulating agent, water, and a urethane resin with a polyol unit, polyisocyanate unit, and an —SO3− group bonded to its main chain terminal, with specific —SO3− group content and glass transition temperature, enhances adhesion and dispersion stability, thereby improving laminate boiling resistance and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pretreatment liquid is applied to an impermeable base material to form a laminate, then adhesion and image quality are improved, but storage stability and boiling resistance deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the pretreatment liquid by incorporating a specific urethane resin with controlled molecular weight (1,000-10,000), specific functional group content (2-10% carboxyl or hydroxyl groups), and controlled glass transition temperature (-50°C to 0°C). These parameter changes enable the resin to maintain adhesion while improving storage stability and boiling resistance through optimized molecular characteristics.
Solution Approach 2:
The patent creates a composite pretreatment liquid system combining the urethane resin with water and optional additives. This composite formulation leverages the adhesive properties of the urethane resin while the water component provides stability and controlled evaporation, achieving both strong adhesion and improved storage stability simultaneously.
2Strength
If a pretreatment liquid is applied to an impermeable base material to form a laminate, then adhesion and image quality are improved, but boiling resistance deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter of the urethane resin to -50°C to 0°C, which provides flexibility and adhesion while maintaining structural integrity at boiling temperatures. The controlled molecular weight (1,000-10,000) and functional group content (2-10%) further enhance boiling resistance by preventing resin degradation and maintaining laminate stability during thermal processing.
3Strength
If a pretreatment liquid with high adhesion is used, then bonding strength is improved, but dispersion stability deteriorates
Solution Approach 1:
The patent carefully controls the molecular weight parameter of the urethane resin within the range of 1,000-10,000, which optimizes the balance between bonding strength and dispersion stability. This molecular weight range ensures sufficient chain length for strong adhesion while preventing excessive molecular size that would cause poor dispersion. The controlled glass transition temperature (-50°C to 0°C) further regulates the resin's mobility and interaction with other components, maintaining dispersion stability.
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 pretreatment liquid improves the boiling resistance and storage stability of laminates by maintaining hydrophobicity and securing dispersion stability, ensuring the laminate's durability and longevity.
Implementation Method 1
maintaining hydrophobicity and securing dispersion stability
Implementation Method 2
a coagulating agent which is at least one selected from the group consisting of an organic acid and a polyvalent metal compound
Data Source
AI summary
There are provided a pretreatment liquid for an ink jet ink, containing a coagulating agent which is at least one selected from the group consisting of an organic acid and a polyvalent metal compound, water, and a urethane resin, in which the urethane resin contains a polyol unit, a polyisocyanate unit, and an —SO3− group, a content of the —SO3− group with respect to a total amount of the urethane resin is 2% by mass to 6% by mass, and the —SO3− group is bonded to a terminal of a main chain of the urethane resin; and an application thereof.