Photopolymerizable Ink Composition for Low Viscosity and High Strength
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Solution Overview
Problem
Existing photopolymerizable compositions for inkjet inks face challenges in forming coating films with low viscosity, high strength, and processing suitability while avoiding skin sensitization issues.
Innovation Solution
A photopolymerizable composition incorporating diethyleneglycoldimethacrylate and alkoxy-modified (meth)acrylic acid esters with an average polymerization degree of the alkoxy part of 9 or higher, which prevents cracking and chipping during processing, and includes caprolactone-modified dipentaerythritol hexaacrylate or ethyleneoxide-modified trimethylol propane trimethacrylate for improved strength and low viscosity, ensuring negative skin sensitization results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional photopolymerizable compositions are used, then coating film strength can be improved, but skin sensitization problems occur and processing suitability deteriorates
Solution Approach 1:
The invention changes the chemical parameters by selecting specific photopolymerizable compounds (diethyleneglycoldimethacrylate with n=2 and alkoxy-modified (meth)acrylic acid ester with n≥9) that have different molecular structures from conventional acrylates, thereby achieving high strength without skin sensitization
Solution Approach 2:
The invention uses a composite photopolymerizable composition combining diethyleneglycoldimethacrylate and alkoxy-modified (meth)acrylic acid ester in specific ratios (30-70 wt% and 70-30 wt% respectively), creating a material that leverages the complementary properties of both compounds to achieve high strength and low sensitization simultaneously
2Strength
If conventional photopolymerizable compositions are used, then coating film strength can be improved, but viscosity increases and processing suitability deteriorates
Solution Approach 1:
The invention optimizes the viscosity parameter by using alkoxy-modified (meth)acrylic acid ester with n≥9, which has lower viscosity compared to conventional short-chain acrylates, while maintaining high strength through the specific molecular structure
Solution Approach 2:
The invention applies different chain lengths and structures to different components: diethyleneglycoldimethacrylate provides crosslinking density for strength, while the long-chain alkoxy-modified ester provides low viscosity for processing, with each component having optimized local properties
3Ease of manufacture
If spray coating or brush coating is used instead of inkjet printing, then coating film formation is easier, but light resistance and strength cannot be achieved without skin sensitization
Solution Approach 1:
The invention changes the chemical composition parameters to include specific photopolymerizable compounds that provide both ease of application and high performance, making inkjet printing as effective as spray or brush coating while adding the benefit of digital precision
Solution Approach 2:
The invention enables inkjet printing to replicate the performance of conventional spray or brush coating methods by using specially formulated photopolymerizable inks that cure to form durable, light-resistant films, thus copying the functional outcome with a more precise and controllable process
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 achieves a coating film with high strength and processing suitability without skin sensitization, suitable for inkjet inks with viscosities between 2 to 150 mPa·s, maintaining durability and flexibility, and can be used in various ejection heads with ease.
Implementation Method 1
a photopolymerizable composition including diethyleneglycoldimethacrylate and alkoxy-modified (meth)acrylic acid ester having an n not less than 9
Data Source
Figure 1~2
AI summary
A photopolymerizable composition includes diethyleneglycoldimethacrylate and alkoxy-modified (meth)acrylic acid ester having an n not less than 9. The n is an average polymerization degree of an alkoxy part of the (meth)acrylic acid ester.