Self-Stratifying Coatings with Fluorinated Drivers
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Solution Overview
Problem
Existing coating technologies lack the ability to create self-stratifying surfaces with desired activity or performance characteristics, as they fail to effectively migrate polymers to the surface or form interfacial layers during curing or drying.
Innovation Solution
A coating composition comprising a base latex resin and a stratifying latex resin, where the stratifying latex is formulated with 'drivers' such as fluorinated monomers, wax, long chain acrylate monomers, and small particle size to migrate to the surface or form interfacial layers, utilizing latent crosslinking functionality and crosslinkers for enhanced stratification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating formulations are used, then the coating provides basic protective coverage, but the coating cannot form self-stratifying layers with enhanced surface performance characteristics
Solution Approach 1:
The patent modifies the coating formulation by incorporating stratifying agents with specific physical and chemical parameters (surface energy, molecular weight, concentration) that enable self-stratification. By controlling these parameters, the coating automatically forms distinct layers during drying without external intervention, achieving enhanced surface performance while maintaining formulation simplicity.
Solution Approach 2:
The coating formulation includes stratifying agents that automatically migrate and self-organize into distinct layers during the drying process based on differences in surface energy and volatility. This self-stratifying mechanism eliminates the need for complex multi-step application processes or external control systems, allowing the coating to enhance its own surface performance characteristics autonomously.
2Reliability
If multiple separate coating applications are used to achieve layered surfaces, then desired surface activity characteristics can be obtained, but the manufacturing process becomes time-consuming and less efficient
Solution Approach 1:
The patent combines multiple coating functions into a single formulation by integrating base coating resins with stratifying agents having different volatilities and surface energies. This unified formulation applies all necessary components in one coating operation, and the stratifying agents automatically separate into functional layers during drying, achieving the same surface activity characteristics that would otherwise require multiple separate coating applications.
Solution Approach 2:
The stratifying agents are pre-incorporated into the coating formulation at specific concentrations and distributions before application. During the drying process, these pre-positioned agents automatically migrate and organize into the desired layered structure based on their inherent physical properties, eliminating the need for subsequent layering operations and significantly improving coating application efficiency.
3Ease of manufacture
If uniform coating composition is maintained throughout the film, then manufacturing simplicity is preserved, but the coating cannot provide differentiated surface and bulk performance properties
Solution Approach 1:
The patent creates local quality differentiation within the coating film by incorporating stratifying agents that automatically concentrate at specific locations (surface or interface) during drying. This results in distinct compositional zones: a surface layer enriched with stratifying agents providing enhanced surface performance, and a bulk layer maintaining the base coating composition. The formulation remains simple and uniform during application, but develops differentiated local properties autonomously during the drying 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 solution enables the formation of coatings with distinct or gradient layers, providing improved surface characteristics and performance by promoting the migration of stratifying polymers to the surface during curing or drying, thereby achieving desired activity or performance traits.
Implementation Method 1
the stratifying latex is formulated to migrate to the surface of the coating or to form an interfacial layer within the coating film... incorporating a fluorinated monomer in the stratifying latex, incorporating a wax as a seed for polymerizing the stratifying latex, incorporating a long chain acrylate monomer having an alkyl length of at least 12 in the stratifying latex
Implementation Method 2
monomers having latent crosslinking functionality may be included in the stratifying latex. In such embodiments, a crosslinker capable of reacting with the latent crosslinking functionality may be included in the coating composition
Data Source
AI summary
The present invention relates to coating compositions formed by combining two latex resins: a base latex resin and a stratifying latex resin. The stratifying latex resin comprises at least one “driver” to promote migration of the stratifying latex to the surface of the coating during curing or drying. Drivers may be selected from one or more of fluorine containing monomers incorporated into the stratifying latex, long chain acrylate monomers, such as lauryl methacrylate, wax, small particle size, or relatively low Tg.