SFAE Latex Barrier Coatings That Prevent Blocking on Folded Paper
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Solution Overview
Problem
Existing barrier coatings for surfaces, particularly those requiring oil and grease resistance, face issues with blocking and cracking when folded or creased, and current detackifiers negatively affect barrier properties or foldability.
Innovation Solution
A barrier coating composition combining saccharide fatty acid esters (SFAEs) with polymers, such as styrene butadiene latex or styrene acrylate latex, reduces tackiness and blocking without compromising barrier function, allowing for improved foldability and maintaining coating integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional barrier coatings are applied to achieve oil and grease resistance, then barrier properties are improved, but blocking occurs when wound into a roll
Solution Approach 1:
The patent uses detackifiers as intermediary substances applied between layers of coated material to prevent unwanted adhesion (blocking) while maintaining barrier properties. The detackifier creates a low-surface-energy interface that reduces tackiness without compromising the oil and grease resistance of the polymer coating.
Solution Approach 2:
The patent modifies surface energy parameters by incorporating detackifiers with specifically low surface energy values into the coating formulation. This parameter change reduces the adhesive characteristics of the coating at low temperatures, preventing blocking during rolling operations while preserving the barrier function.
2Object-generated harmful factors
If detackifiers are used to reduce blocking, then blocking is reduced, but barrier properties and foldability are negatively affected
Solution Approach 1:
The patent applies detackifiers selectively in specific formulations and at controlled concentrations, creating local zones of reduced surface energy only where needed to prevent blocking. This localized application allows the bulk of the coating to maintain its barrier properties and foldability while specific interfaces exhibit reduced tackiness.
Solution Approach 2:
The patent creates composite coating systems combining polymers with detackifier additives, where the composite exhibits both barrier properties from the polymer matrix and anti-blocking properties from the detackifier components. The synergistic combination allows simultaneous achievement of multiple functions.
3Strength
If polymer coatings with high adhesive characteristics are used, then adhesion is improved, but blocking occurs at low temperatures
Solution Approach 1:
The patent creates a dynamic coating system where the detackifier modifies the adhesive characteristics of the polymer in response to temperature changes. At low temperatures, the detackifier suppresses excessive adhesion to prevent blocking, while at application temperatures, the coating maintains sufficient adhesion for bonding functionality.
Data Source
AI summary
The present disclosure describes methods of treating cellulosic materials with barrier coating compositions that allow for modifications of surfaces, including making such surfaces exhibit barrier functions such as oil and grease resistance, water resistance and the like. The methods as disclosed provide combining at least one saccharide fatty acid ester (SFAE) with polymers and applying such combinations on substrates including cellulose-based materials. Compositions comprising combinations of SFAE and polymers are also disclosed, including the use of such compositions to reduce blocking effects of said polymers without affecting the barrier performance or folding of articles of manufacture coated with said compositions. In addition, blocking ratings data for SFAE-polymer compositions may be used to identify conditions under which adhesive properties may be exploited to produce compositions that allow for effective heat sealing of articles of manufacture.