Silica-Dispersed Polyester for Opaque Packaging
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Solution Overview
Problem
Current packaging solutions, such as those made from polyethylene terephthalate (PET), are not suitable for storing products sensitive to ultraviolet and visible light radiations, as they lack opacity and are costly to produce in opaque forms, especially when using opacifying agents like titanium dioxide or multilayered structures.
Innovation Solution
A polymeric composition comprising a polyester resin and micrometrical silica particles, which provides low light transmission up to 700 nm, improved mechanical, thermal, and gas barrier properties, while being cost-effective and suitable for monolayer packaging articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If PET resin is used for making transparent packaging articles, then good mechanical properties and thermal performances are achieved, but the packaging articles are not suitable for storing light-sensitive products due to high light transmission
Solution Approach 1:
The patent applies composite materials by combining PET resin with micrometrical silica particles to create an opaque packaging material that blocks light transmission while maintaining the mechanical and thermal properties of PET. The silica particles act as an opacifying agent within the polymer matrix, creating a composite that simultaneously achieves opacity and structural integrity.
2Object-affected harmful factors
If opacifying agents such as titanium dioxide are used to make opaque packaging articles, then light transmission is reduced, but the production cost increases significantly
Solution Approach 1:
The patent employs silica particles as a cost-effective alternative to expensive titanium dioxide opacifying agents. Silica is a cheaper, readily available material that provides the necessary opacification function without the high cost associated with traditional opacifiers like TiO2, thereby reducing production costs while achieving the same protective effect against light transmission.
3Object-affected harmful factors
If multilayered packaging articles including a black layer are used, then opacity to UV and visible light is improved, but the production cost and structural complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for complex multilayered structures by using a single-layer PET composition incorporating silica particles. Instead of relying on multiple layers (including black layers) to achieve opacity, the invention uses silica-dispersed PET in a monolayer configuration, thereby simplifying the packaging structure while maintaining effective light blocking properties.
4Object-affected harmful factors
If multilayered packaging articles are used to achieve opacity, then light transmission is reduced, but the production cost increases
Solution Approach 1:
The patent uses composite materials (PET + silica particles) in a monolayer structure to achieve opacity, eliminating the need for expensive multilayered constructions. The silica particles provide the opacification function within a single layer, reducing both material and processing costs associated with manufacturing multiple layers.
Solution Approach 2:
The invention extracts the opacification function from complex multilayered structures and implements it within a single-layer PET composition containing silica particles. This simplification removes the need for additional layers and associated manufacturing costs while maintaining the desired light-blocking performance.
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 significant reduction in light transmission, enhanced mechanical and thermal stability, and improved gas barrier properties, making it suitable for storing light-sensitive products without the need for expensive opacifying agents or complex multilayer structures, while maintaining processability for biaxially stretched containers.
Implementation Method 1
The polyester-based composition comprises silica particles... exhibits high opacity, especially at wavelengths up to 700 nm and more especially between 400 nm and 500 nm
Implementation Method 2
The use of opacifying agents such as TiO2 gives good result in terms of opacity... A polymeric composition comprising (A) a polyester resin and (B) micrometrical silica particles
Data Source
AI summary
The polymeric composition comprising (A) a polyester resin and (B) micrometrical silica particles, preferably particles made of cristobalite or quartz, dispersed in the polyester resin preferably at concentration of at least 2 wt %. The polyester resin preferably comprises a PET homo or copolymer. Packaging articles, especially biaxially stretched blow molded containers, made with the said polymeric composition exhibit high opacity to UV and visible light radiations as well as improved barrier properties to O2 and to water vapor, and improved thermal and mechanical properties.