Acrylic Polyester Resin for Food Packaging Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aqueous coatings for food and beverage containers face challenges in achieving high-speed application, adequate adhesion, and safety for food contact, with polyester materials often providing poor solubility in water and resulting in poor shelf life and coating quality.
Innovation Solution
An acrylic polyester resin is developed by grafting an acrylic polymer with a polyester material polymerized from a polyacid and polyol component, including a diol according to Formula (I), which enhances solubility and stability, and is used in an aqueous coating composition with a crosslinking material and water to create a durable and stable coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polyester materials are used as film forming resin in aqueous coatings, then the coatings can be applied at high speed, but the polyester materials do not provide adequate solubility in water resulting in poor shelf life and poor coating qualities
Solution Approach 1:
The patent uses a composite resin system combining polyester resin and acrylic resin in specific proportions (30-70 wt% polyester, 70-30 wt% acrylic). This composite approach allows the coating to maintain high-speed application properties from the polyester while the acrylic component provides improved water solubility and shelf stability, resolving the contradiction between application speed and shelf life.
Solution Approach 2:
The patent modifies the chemical composition parameters of the resin system by incorporating acrylic resin with specific functional groups that enhance water solubility. By adjusting the ratio of polyester to acrylic resin and selecting acrylic resins with appropriate hydrophilic characteristics, the coating achieves both fast application and improved shelf stability in aqueous environments.
2Productivity
If polyester materials are used as film forming resin in aqueous coatings, then the coatings can be applied at high speed, but the polyester materials do not provide adequate solubility in water resulting in poor coating qualities
Solution Approach 1:
The composite resin system combining polyester and acrylic resins allows the coating to inherit the fast-drying and high-speed application properties of polyester while the acrylic component contributes to smoother film formation, better levelness, and reduced defects, thereby achieving both high productivity and high coating quality.
Solution Approach 2:
By optimizing the resin composition parameters and selecting acrylic resins with appropriate molecular weight and functional group distribution, the coating formulation achieves rapid application capability while maintaining excellent film formation and surface quality, resolving the contradiction between application speed and coating quality.
3Object-affected harmful factors
If conventional aqueous coatings are used, then the coatings can be applied safely for food contact, but they display poor shelf life and poor coating qualities
Solution Approach 1:
The patent employs a composite resin formulation where both polyester and acrylic components are selected to meet food contact safety requirements. The acrylic resin portion contributes enhanced water compatibility and stability, allowing the coating to maintain food safety certification while achieving improved shelf life and coating performance in aqueous systems.
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 solution improves the resistance and hydrolytic stability of the coating, leading to better shelf life and performance, while maintaining necessary properties for packaging applications.
Implementation Method 1
an acrylic polyester resin, obtainable by grafting an acrylic polymer and a polyester material
Implementation Method 2
b) a crosslinking material
Data Source
AI summary
An acrylic polyester resin is provided by grafting an acrylic polymer with a polyester material. Also provided is an aqueous coating composition with at least the acrylic polyester resin and a metal packaging container coated with the aqueous coating composition.