Aqueous Polymer Dispersion for Ink Anchorage Primer
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Solution Overview
Problem
Existing ink anchorage primers fail to effectively enhance ink bonding to substrates like biaxially oriented polypropylene (BOPP) and other materials, leading to poor adhesion in printing applications.
Innovation Solution
An aqueous polymer dispersion is developed, comprising specific monomers and a compound with reactive functional groups, which is used to create an ink anchorage primer that improves ink adhesion to substrates such as PE, PET, and BOPP through free-radical polymerization and emulsion polymerization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If styrene-acrylate copolymer emulsion is used as ink anchorage primer, then adhesion to some metallized PE substrates is improved, but adhesion to other substrates like BOPP deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the polymer emulsion by incorporating carboxylic acid groups and vinyl ester monomers with specific structural characteristics. This changes the adhesive properties of the primer to achieve universal adhesion across different substrate types including metallized PE and BOPP
Solution Approach 2:
The invention creates a composite polymer system combining styrene-acrylate copolymer with additional functional monomers (carboxylic acid-containing monomers and vinyl esters). This composite structure provides both the adhesion properties of the base polymer and the enhanced substrate compatibility from the functional additives
2Ease of manufacture
If UV curable ink is printed directly on substrate surface, then printing process is simplified, but ink adhesion to substrate deteriorates
Solution Approach 1:
The patent introduces an ink anchorage primer as an intermediary layer between the UV curable ink and the substrate. This primer layer provides the necessary adhesion promotion without requiring changes to the ink formulation or printing process, maintaining simplicity while solving the adhesion problem
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 aqueous polymer dispersion significantly enhances ink bonding to various substrates, including BOPP, by forming a stable film that maintains adhesion even after drying, as demonstrated by improved ink retention rates compared to traditional styrene-acrylate copolymer emulsions.
Implementation Method 1
through free-radical polymerization and emulsion polymerization processes
Implementation Method 2
through free-radical polymerization and emulsion polymerization processes
Implementation Method 3
at least one compound which comprises at least two functional groups reactive to the keto or aldehyde group
Data Source
AI summary
The present invention is directed to an aqueous polymer dispersion comprising A) a polymer synthesized from monomers comprising, a) 1.0 to 90% by weight of at least one alkyl (meth)acrylate; b) 0.1 to 10% by weight of at least one ethylenically unsaturated acid or vinyl monomer with latent ionic groups; c) 0 to 5.0% by weight of at least one monoethylenically unsaturated monomer having at least one keto or aldehyde group; d) 1.0 to 90% by weight of at least one vinyl ester of saturated aliphatic monocarboxylic acid in which the carboxyl groups are attached to tertiary and/or quaternary carbon atoms; e) 0 to 20% by weight of at least one vinyl aromatics; f) 0 to 20% by weight, based on the total amount of monomers for the synthesis of polymer A), of at least one hydroxyalkyl (meth)acrylate, and B) option at least one compound which comprises at least two functional groups reactive to the keto or aldehyde group. The present invention also provides an ink anchorage primer comprising said aqueous polymer dispersion which enhance ink bonding to the substrate like polyethylene, polyethylene terephthalate, etc., especially the biaxially oriented polypropylene.