Polymer Binder Coating for Substrate Protection and Alkali Removal
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Solution Overview
Problem
Existing protective coatings for substrates like glass and plastic lack easy removability without damaging the substrate or interfering with subsequent protective layers, and they often fail to maintain transparency and binding strength under varying environmental conditions.
Innovation Solution
A protective coating preparation using a polymer binder produced by anionic polymerization with specific molecular weight and acid value ranges, allowing for strong adhesion and easy alkali removal, while maintaining transparency and UV stability, and adjustable light transmission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protective coating is applied to provide strong binding strength, then the coating remains intact during use, but the coating becomes difficult to remove without excessive mechanical force or chemical agents
Solution Approach 1:
The patent applies parameter changes by carefully controlling the acid value (60-160) and molecular weight (50,000 g/mol) of the polymer binder, as well as the polydispersity (3-5). These parameter optimizations enable the coating to achieve strong initial adhesion while maintaining susceptibility to alkali removal through saponification of ester bonds, resolving the contradiction between binding strength and removability.
2Ease of operation
If chemical removal agents are used to remove the protective coating, then the coating can be removed, but the agents may negatively affect the translucence of the substrate or interfere with subsequent protective layers
Solution Approach 1:
The patent converts the potential harm of chemical removal agents into a benefit by designing the polymer binder with specific ester bonds that are selectively susceptible to alkali saponification. This allows mild alkali solutions to remove the coating without requiring aggressive chemicals that would damage the substrate or interfere with subsequent layers, transforming the removal process from harmful to beneficial.
3Duration of action of stationary object
If the protective coating is designed for long-term durability, then the coating maintains protection during harvest cycles, but the coating becomes harder to remove
Solution Approach 1:
The patent resolves this contradiction through precise parameter control of the polymer binder, specifically the acid value (60-160) and molecular weight (50,000 g/mol). These parameters are optimized to provide sufficient crosslinking density for long-term durability during harvest cycles while maintaining adequate ester bond content for complete removal via saponification, enabling both long-term protection and eventual removability.
4Strength
If the coating formulation is optimized for strong adhesion, then the coating binds well to the substrate, but the formulation complexity increases
Solution Approach 1:
The patent reduces formulation complexity by focusing on optimizing key parameters of a single polymer binder component rather than using complex multi-component formulations. By controlling the acid value (60-160), molecular weight (50,000 g/mol), and polydispersity (3-5) of the polymer binder, the patent achieves strong adhesion through simplified means, avoiding the need for complex additive packages or multi-step formulation processes.
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 coating provides robust substrate binding, easy removal with minimal mechanical force, and maintains protective properties during intended use cycles, with improved UV stability and adjustable light transmission, ensuring effective protection and ease of application and removal.
Implementation Method 1
the binder is a polymer obtainable by anionic polymerization
Implementation Method 2
the carbanion via which the anionic polymerization proceeds, will remain active and capable of adding another monomer. The polymer chains will remain active indefinitely, unless there is inadvertent or deliberate termination or chain transfer. Thus, a polymer binder according to the invention will exhibit improved adhesive strength to the substrate, as the polymer chain may react and bind to the substrate
Implementation Method 3
the transparency property should be adjusted as desired dependent on the pigment and/or filler used
Data Source
Figure 1
AI summary
The invention relates to protective coating preparation, such as for a protective coating for a glass or plastic substrate, comprising a binder, and a pigment and/or filler, wherein the binder is a polymer produced by anionic polymerization, and has an acid value of 100 to 200, preferably 110 to 150; a polydispersity of 1.2 to 5; preferably 1.5 to 4; and an average molecular weight of 5.000 to 10.000, preferably 6.000 to 9.000, and to a substrate protected with such preparation in the form of a coating.