Blow Molded Article With High Viscosity Silicone Additive
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Solution Overview
Problem
Existing methods for achieving a glossy and opaque appearance in thermoplastic containers using inorganic pigments or silicone additives face challenges such as surface texture issues, weld line formation, wear on equipment, and limitations in maintaining structural integrity while achieving consistent visual effects.
Innovation Solution
Incorporating a high viscosity additive with a refractive index difference of at least 0.04 into a thermoplastic resin, forming discrete domains that enhance light scattering and maintain structural integrity, allowing for a single-layer article with balanced opacity, gloss, and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inorganic pigments are added to achieve high opacity, then opacity is improved, but surface gloss is reduced
Solution Approach 1:
The patent changes the physical and chemical parameters of the additive by using high molecular weight silicone (viscosity >1,000,000 cst) with specific refractive index properties, rather than traditional inorganic pigments. This parameter change allows achieving both opacity and gloss simultaneously, as the high viscosity prevents pigment aggregation while the refractive index difference creates light scattering for opacity without surface roughness that would reduce gloss.
Solution Approach 2:
The patent creates a composite material system by combining thermoplastic resin with high molecular weight silicone additive. This composite approach allows the silicone to form discrete domains within the resin matrix, providing optical effects (opacity through light scattering) while maintaining the smooth surface of the thermoplastic material for gloss, thus resolving the contradiction between opacity and surface gloss.
2Illumination intensity
If siloxane fluid is used to provide glossy exterior, then surface gloss is improved, but visual consistency throughout the article is reduced
Solution Approach 1:
The patent dramatically increases the viscosity parameter of the siloxane fluid from ≤1,000,000 cst to >1,000,000 cst (high molecular weight silicone). This parameter change fundamentally alters the fluid's behavior during processing, preventing it from migrating and coalescing into puddles. The high viscosity ensures uniform distribution and stable domain formation throughout the article, achieving both surface gloss and visual consistency.
3Ease of manufacture
If low viscosity siloxane fluid is used, then processing is easier, but additive coalesces into puddles reducing structural integrity
Solution Approach 1:
The patent changes the viscosity parameter from low to high (>1,000,000 cst), which fundamentally alters the processing behavior. The high viscosity prevents the additive from flowing and coalescing into large puddles during injection molding. Instead, it forms stable, discrete domains that remain uniformly distributed, maintaining structural integrity while still being processable through proper formulation and processing parameters.
4Illumination intensity
If high amount of additive is used to enhance visual effects, then visual benefit is improved, but structural integrity is compromised
Solution Approach 1:
The patent changes the viscosity parameter of the additive to high molecular weight (>1,000,000 cst), which allows using higher amounts of additive (up to 20% by weight) without compromising structural integrity. The high viscosity prevents phase separation and coalescence, ensuring uniform distribution of additive domains throughout the matrix. This uniform distribution maintains mechanical properties while achieving enhanced visual effects through controlled light scattering.
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 approach enables consistent and enhanced visual effects with reduced additive usage, improving structural integrity and manufacturing efficiency while avoiding the drawbacks of previous methods.
Implementation Method 1
the domains remain relatively small, they allow for better scattering of light as it passes through the article
Implementation Method 2
there is a refractive index difference of at least 0.04 between the additive and the thermoplastic material
Data Source
AI summary
A blow molded article, a method of making a blow molded article and a method of making a preform each having at least one layer comprising a thermoplastic resin and between 0.1% and 20% of an additive having a viscosity of greater than 1,000,000 cst. There is a refractive index difference of at least 0.04 between the additive and the thermoplastic resin. The high viscosity of the additive ensures even distribution of the additive within the thermoplastic resin in discrete domains, while additionally providing for a complex end look balancing opacity, gloss and depth.