Fluorinated Acrylate Copolymer Coating for Blocking and Elongation
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Solution Overview
Problem
Conformable coating compositions used as liquid bandages often suffer from blocking issues and failure when elongated, indicating a need for improved properties such as reduced blocking and elongation failure.
Innovation Solution
A conformable coating composition comprising a (meth)acrylate copolymer with interpolymerized monomer units of fluorinated monomers, silane monomers, and high Tg monomers, combined with a volatile solvent, which reduces blocking and elongation failure by optimizing the weight percentage of each component to achieve specific glass transition temperatures and solubility parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conformable coating compositions are used as liquid bandages, then they provide basic protective function, but they exhibit blocking issues and failure when elongated
Solution Approach 1:
The patent employs a composite copolymer system comprising multiple monomer types (fluorinated monomers, silane monomers, and high Tg monomers) to achieve synergistic properties. The fluorinated monomers provide flexibility and low Tg, the silane monomers contribute to adhesion and crosslinking, and the high Tg monomers provide structural strength, collectively resolving the contradiction between reliability and strength
Solution Approach 2:
The patent systematically adjusts critical parameters including glass transition temperature (Tg) through monomer selection, solubility parameters through compositional variation, and weight percentages of each component to optimize performance. By controlling Tg between -50°C to 50°C and adjusting monomer ratios, the coating achieves both blocking resistance and elongation strength
2Ease of operation
If the coating is made more flexible to reduce blocking, then blocking is reduced, but elongation failure increases
Solution Approach 1:
The patent assigns different functional roles to different components within the copolymer system. Fluorinated monomers with low Tg values provide local flexibility and conformability, while high Tg monomers provide local structural strength. This spatial and functional differentiation within the molecular structure allows the coating to simultaneously achieve ease of operation and reliability
Solution Approach 2:
The composite nature of the copolymer, combining monomers with complementary properties, enables the coating to exhibit both flexibility for conformability and strength for elongation resistance. The synergistic interaction between different monomer units resolves the contradiction between ease of operation and reliability
3Adaptability or versatility
If the glass transition temperature is lowered to improve conformability, then conformability improves, but blocking resistance deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter within a specific range (-50°C to 50°C) through careful selection and ratio adjustment of monomers with different Tg values. This parameter optimization balances conformability (requiring lower Tg) with blocking resistance (requiring higher Tg), resolving the contradiction between adaptability and harmful factors
Solution Approach 2:
Different monomer units contribute different thermal properties to the copolymer structure. By incorporating monomers with low Tg for conformability and monomers with higher Tg for blocking resistance, the patent creates a composition with distributed thermal properties that resolves the contradiction
Data Source
AI summary
Conformable coating composition are described comprising a (meth)acrylate copolymer comprising interpolymerized monomer units of fluorinated monomer and a volatile solvent having a solubility parameter from 4.9-12.5 (cal/cm3)1/2. In some embodiments, the fluorinated monomer has a Tg <30° C. In some embodiments, the dried coating exhibits no blocking and no greater than 75% failure at an elongation of 100%. Also described is a conformable film comprising a dried coating composition of the coating compositions described herein, articles comprising a layer of the conformable film on a substrate, and a copolymer comprising interpolymerized units of fluorinated monomer(s), silane monomer(s); and one or more monomers having a Tg ≥50° C.