Flexible Packaging Primer Composition for Heat-Resistant Inkjet Prints
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Solution Overview
Problem
Conventional primer compositions for flexible packaging materials lack adequate heat resistance, water resistance, and alcohol resistance when used for inkjet images, and also suffer from issues of solid uniformity, bleeding, and abrasion.
Innovation Solution
A primer composition comprising an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound with multiple hydrazine residues, and wax, with specific glass transition temperature and content ratios, enhances heat resistance, alcohol resistance, and improves solid uniformity and abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional primer composition is used for inkjet printing on flexible packaging, then basic printing function is achieved, but heat resistance, alcohol resistance, and water resistance of coating film are insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple resin components (acryl-based resin emulsion, polyester resin, polyurethane resin) with specific functional additives (N-oleoyl sarcosine, hydrazine-based compound, wax) to create a primer composition that simultaneously achieves heat resistance, alcohol resistance, and water resistance. This composite approach allows the coating film to exhibit multiple resistant properties that single materials cannot provide.
Solution Approach 2:
The patent utilizes parameter changes by controlling the glass transition temperature (Tg) of the acryl-based resin emulsion within a specific range (−50°C to 0°C) and optimizing the content ratios of different resin components and additives. These parameter optimizations enable the coating film to achieve the required resistance properties while maintaining solid uniformity and preventing bleeding.
2Manufacturing precision
If conventional primer composition is applied, then coating can be formed, but solid uniformity and bleeding resistance are poor
Solution Approach 1:
The patent achieves improved solid uniformity and bleeding resistance through parameter optimization, specifically by controlling the glass transition temperature of the acryl-based resin emulsion within −50°C to 0°C and optimizing the content ratios of resin components and additives. These parameter adjustments ensure proper ink absorption and distribution, preventing bleeding while maintaining uniform solid coverage.
3Strength
If conventional primer composition is used, then basic coating function is achieved, but abrasion resistance is insufficient
Solution Approach 1:
The patent enhances abrasion resistance through composite materials by incorporating wax (such as polyethylene wax or polypropylene wax) alongside the resin components. The wax forms a protective network within the coating film that significantly improves abrasion resistance, making the printed surface more durable against mechanical wear while maintaining other required properties.
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 composition imparts excellent solid uniformity, bleeding resistance, abrasion resistance, and heat resistance to coating films, ensuring improved performance and stability.
Implementation Method 1
an acryl-based resin emulsion emulsified with a polymer
Implementation Method 2
N-oleoyl sarcosine, which has been conventionally used as an antirust agent
Implementation Method 3
a hydrazine-based compound having at least two or more hydrazine residues in a molecule
Implementation Method 4
wax
Data Source
AI summary
It is an object of the present invention to provide a primer composition for surface-printed flexible packaging, an ink set, a surface-printed matter, and an inkjet printing method, which can impart excellent solid uniformity, bleeding resistance, abrasion resistance, alcohol resistance, and heat resistance to a coating film when an inkjet image is formed after applying the primer composition. Provided is a primer composition for surface-printed flexible packaging comprising an acryl-based resin emulsion emulsified with a polymer, N-oleoyl sarcosine, a hydrazine-based compound having at least two or more hydrazine residues in a molecule, and wax, wherein a content of the acryl-based resin emulsion is 3 to 40% by mass in terms of solid content, and wherein a glass transition temperature of the acryl-based resin emulsion is-40 to 30° C.