Over Varnish Composition PFOA-Free Scratch Resistance
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Solution Overview
Problem
Current over varnish layers for aerosol cans and extruded plastic tubes often contain perfluorooctanoic acid (PFOA), which is carcinogenic, and lack sufficient scratch resistance and surface slip properties.
Innovation Solution
A thermally-curable or UV-curable over varnish composition comprising a film-forming resin, micronized wax, and micronized polysaccharide is applied, providing scratch resistance and surface slip improvements without using PFOA, and can be used on monobloc aerosol cans and extruded plastic tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTFE-based waxes containing PFOA are used in over varnish layers, then the layer provides protective properties, but it introduces carcinogenic and harmful chemical substances
Solution Approach 1:
The patent removes PFOA and PTFE-based waxes from the over varnish composition entirely, replacing them with alternative wax components that do not contain harmful substances. This extraction of the harmful element maintains the protective function while eliminating the carcinogenic risk.
Solution Approach 2:
The patent changes the chemical composition parameters of the wax component in the over varnish layer, substituting PTFE-based waxes with other wax types (such as carnauba wax, beeswax, or synthetic waxes without PFOA) to achieve the same protective properties without the harmful chemical additives.
2Reliability
If conventional over varnish compositions are used, then the layer provides basic protection, but it lacks sufficient scratch resistance
Solution Approach 1:
The patent creates a composite over varnish composition combining multiple components: film-forming resin, alternative wax (replacing PTFE), and polysaccharide. This composite structure provides both basic protection and enhanced scratch resistance through the synergistic effects of the different materials, where the resin provides film formation and the wax/polysaccharide combination provides mechanical strength and abrasion resistance.
3Reliability
If conventional over varnish compositions are used, then the layer provides basic protective function, but it lacks sufficient surface slip properties
Solution Approach 1:
The patent modifies the surface properties of the over varnish layer by adjusting the composition parameters, specifically incorporating polysaccharide and alternative wax components that provide lubricating effects. This changes the surface friction characteristics to improve slip value while maintaining the protective function through the film-forming resin matrix.
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 composition achieves scratch resistance of at least 10 to 18 revolutions and improved surface slip values, while being free from undesirable chemicals like PFOA, enhancing the protective and decorative properties of the coated surfaces.
Implementation Method 1
The over varnish composition may be a UV-curable composition
Implementation Method 2
cured thermally
Data Source
AI summary
A package coated on at least a portion thereof with an over varnish layer, the over varnish layer being derived from an over varnish composition comprising a film-forming resin, a micronized wax, and a micronized polysaccharide; wherein the package may be a monobloc aerosol can or an extruded plastic tube.