Melt-State Poly(Vinyl Alcohol) Derivative for Silicone Anchorage
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Solution Overview
Problem
Existing release liners face issues with uncured cross-linker migration through paper substrates, leading to contamination and poor print quality, and require improved anchorage of silicone compounds at reduced platinum levels for high-speed labeling applications, while current methods are inefficient and hazardous due to solvent-based reactions.
Innovation Solution
A melt state condensation reaction between thermoplastic poly(vinyl alcohol) and organic acid anhydride forms a reaction product with ester bonded pendant chains ending in vinyl groups, eliminating the need for solvents and reducing the formation of harmful by-products, enabling a stable and efficient primer layer for release liners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If solvent-based reactions are used to manufacture primer layer composition, then the reaction can proceed at lower temperatures with better mixing, but the process becomes hazardous and requires solvent handling infrastructure
Solution Approach 1:
The patent changes the physical state parameter of the reaction system from liquid (solvent-based) to solid (melt state). This parameter change eliminates the need for solvent handling while enabling the reaction to proceed at elevated temperatures (150-250°C) that facilitate complete reaction and eliminate solvent-related hazards.
Solution Approach 2:
The patent converts the potential harm of high-temperature processing into a benefit by using the melt state reaction. The high temperature that would normally be considered a risk actually enables complete reaction, eliminates solvent hazards, and produces a more stable primer layer composition without requiring hazardous solvent handling infrastructure.
2Reliability
If excess cross-linker compound is used to ensure complete curing of silicone base polymer, then the curing efficiency is improved, but uncured cross-linker migrates through the paper substrate and contaminates the label laminate web
Solution Approach 1:
The patent introduces a primer layer composition as an intermediary between the paper substrate and the silicone release coating. This primer layer, containing vinyl-containing compounds and carboxylic acid residues, acts as a binding layer that enhances anchorage of the silicone compounds to the substrate, allowing complete curing with proper stoichiometry and preventing uncured cross-linker migration.
Solution Approach 2:
The patent applies the primer layer composition to the paper substrate before applying the silicone release coating. This preliminary action prepares the substrate surface with vinyl-containing compounds that will react with the silicone base polymer, ensuring proper anchorage and preventing migration issues before the silicone coating is applied.
3Quantity of substance
If reduced platinum catalyst levels are used to reduce costs, then the manufacturing cost is reduced, but the anchorage of silicone compounds to the substrate deteriorates
Solution Approach 1:
The patent introduces a primer layer with vinyl-containing compounds as an intermediary that enhances the chemical interaction between the substrate and silicone compounds. This intermediary layer provides additional vinyl groups that react with the silicone base polymer, compensating for reduced platinum catalyst levels and maintaining strong anchorage at lower catalyst concentrations.
Solution Approach 2:
The patent creates a composite structure consisting of the paper substrate, primer layer containing vinyl-containing compounds and carboxylic acid residues, and silicone release coating. This composite material system enhances the overall anchorage strength through multiple interaction mechanisms, allowing reduced platinum usage while maintaining performance.
4Object-generated harmful factors
If conventional primer layers are used to prevent cross-linker migration, then some barrier effect is provided, but the anchorage of silicone compounds to the substrate remains insufficient for high-speed labeling applications
Solution Approach 1:
The patent creates a composite primer layer composition containing both vinyl-containing compounds (for anchorage through reaction with silicone base polymer) and carboxylic acid residues (for barrier properties). This composite material provides dual functionality: preventing cross-linker migration while ensuring strong anchorage of silicone compounds for high-speed labeling applications.
Solution Approach 2:
The patent designs the primer layer composition with different functional components distributed throughout the layer. The vinyl-containing compounds are positioned to interact with the silicone base polymer for anchorage, while the carboxylic acid residues provide barrier properties to prevent cross-linker migration. This local quality differentiation enables simultaneous achievement of both functions.
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 method produces a stable primer layer that prevents cross-linker migration and ensures strong anchorage of silicone compounds, facilitating high-speed labeling without solvent handling hazards and improving print quality.
Implementation Method 1
A melt state condensation reaction between thermoplastic poly(vinyl alcohol) and organic acid anhydride forms a reaction product with ester bonded pendant chains ending in vinyl groups
Implementation Method 2
The catalytic hydrosilation reaction, also denoted as hydrosilylation, refers to a covalent bond formation between functional vinyl groups in the silicone base polymer and silane hydride (Si—H) groups in the cross-linker compound in the presence of a platinum catalyst
Data Source
AI summary
The invention relates to a method for manufacturing thermoplastic poly(vinyl alcohol) derivative in a melt state reaction and a product thereof, wherein the method thermoplastic poly(vinyl alcohol) that has been dried is heated and admixed with an organic acid anhydride that has a catenated carbon structure which ends into a vinyl group, such that a mixture is obtained which is above the melting point of the mixture, thereby causing an ester bond forming condensation reaction in a melt state, wherein at least some of the organic acid anhydride reacts with hydroxyl groups of the thermoplastic poly(vinyl alcohol), such that reaction product is formed which contains carboxylic acid residue and thermoplastic poly(vinyl alcohol) derivative which contains ester bonded pendant chains of which at least some end into vinyl groups. The invention further relates to a method for manufacturing a paper substrate and a product thereof, which contains a primer layer that contains the reaction product.