Coating Composition Non-Blocking Properties
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Solution Overview
Problem
Current polymeric coating compositions for paper products often suffer from blocking issues, where adjacent layers tend to stick together, despite efforts to improve non-blocking properties.
Innovation Solution
A coating composition comprising a dispersion of ethylene-based or propylene-based thermoplastic polymers, stabilizing agents, and a crosslinker, such as zinc ammonium carbonate, applied to cellulosic substrates to form coated articles with improved non-blocking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric coating compositions are used to provide barrier properties and structural integrity, then grease, oil, water resistance and strength are improved, but blocking tendency increases causing adjacent layers to stick together
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the coating - specifically incorporating crosslinkers (metal salts like zinc ammonium carbonate, aluminum, calcium, magnesium) and controlling the ratio of polar to non-polar polymers. This changes the chemical structure from linear to crosslinked network, reducing polymer chain mobility and blocking tendency while maintaining barrier properties
Solution Approach 2:
The patent creates composite coating materials by combining multiple polymer types (polar polymers like polyvinylidene chloride, non-polar polymers like polyethylene) with crosslinking agents. This composite structure provides both the desired barrier properties from the polymers and reduced blocking from the crosslinked network architecture
2Strength
If polymeric coating compositions are applied to improve structural integrity and strength, then coating strength is enhanced, but blocking occurs between adjacent coated layers
Solution Approach 1:
The patent applies preliminary action by incorporating crosslinkers into the coating composition before application. The crosslinking reaction occurs during or after drying, creating a rigidified network structure that maintains strength while preventing blocking. The crosslinker is pre-positioned in the coating formulation to ensure uniform distribution and effective crosslinking
Solution Approach 2:
The patent changes the physical state parameter of the coating by transforming it from a flexible polymeric structure to a crosslinked network structure. This parameter change in molecular architecture provides dimensional stability and strength while reducing the viscoelastic properties that cause blocking between layers
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 effectively reduces the tendency of coated paper articles to stick together, enhancing their non-blocking properties and maintaining structural integrity.
Implementation Method 1
the coating composition comprises (a) a dispersion; and (b) a crosslinker. The crosslinker may, for example, be zinc ammonium carbonate.
Implementation Method 2
removing a at least a portion of the water; and (5) thereby forming said coated article
Data Source
AI summary
The instant invention is a coating composition, a coated article, and method forming such coated articles. The coating composition comprises (a) a dispersion; and (b) a crosslinker. The dispersion comprises at least one or more base polymers selected from the group consisting of an ethylene-based thermoplastic polymer, a propylene-based thermoplastic polymer, and mixtures thereof; at least one or more stabilizing agents; and a fluid medium. The crosslinker may, for example, be zinc ammonium carbonate. A coated article comprises a substrate comprising cellulosic materials; and at least one or more coating layers present on at least one or more surfaces of the substrate. The one or more coating layers may be derived from a coating composition comprising (a) a dispersion; and (b) a crosslinker. The dispersion comprises at least one or more base polymers selected from the group consisting of an ethylene-based thermoplastic polymer, a propylene-based thermoplastic polymer, and mixtures thereof; at least one or more stabilizing agents; and a fluid medium. The method of forming a coated article comprises the steps of (1) selecting a substrate comprising cellulosic materials; (2) selecting a coating composition comprising (a) a dispersion comprising at least one or more base polymers selected from the group consisting of an ethylene-based thermoplastic polymer, a propylene-based thermoplastic polymer, and mixtures thereof; at least one or more stabilizing agents; and a fluid medium; and (b) a crosslinker; (3) applying said coating composition to at least one or more surfaces of said substrate; (4) removing a at least a portion of the water; and (5) thereby forming said coated article.