Non-Foamed Silica Coating for Uniform White Opacifying Elements
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Solution Overview
Problem
Existing light-blocking materials, such as blackout curtains and shades, face challenges in achieving a lightweight, flexible, and uniformly white appearance while maintaining light-absorptive properties, and there is a risk of dark opacifying agents escaping during handling and sewing, leading to undesirable shading and soiling.
Innovation Solution
A method involving a foamed aqueous composition with porous particles and a non-foamed functional composition formulation, where the foamed opacifying layer is densified and topped with a non-foamed functional composition containing untreated synthetic silica, providing a uniform white appearance and preventing opacifying agents from escaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thick foam coatings with light scattering pigments are used to create light-colored blackout curtains, then light blocking capability is improved, but weight increases
Solution Approach 1:
The patent uses a composite structure combining a foamed latex layer containing light scattering pigments (titanium dioxide, clays) with a separate light-absorbing foamed black or grey pigment layer (carbon black). This composite approach allows the light-colored outer layer to scatter light while the black layer absorbs transmitted light, achieving blackout capability without requiring excessively thick applications of light scattering pigments alone, thereby controlling weight.
Solution Approach 2:
The patent applies different functional properties to different layers: the outer foamed layer provides light scattering and color matching, while the inner carbon black layer provides light absorption. This local differentiation of functional qualities allows each layer to be optimized for its specific purpose, reducing the overall material thickness and weight required compared to using a single uniform layer.
2Weight of moving object
If carbon black layer is used between two light scattering layers to reduce weight, then weight is reduced, but carbon black can become fugitive during puncture or tear, causing soiling
Solution Approach 1:
The patent incorporates a release agent into the foamed latex composition before application. This release agent creates a barrier that prevents carbon black particles from becoming fugitive during subsequent handling, sewing, or laundering operations. The release agent is applied beforehand to cushion against the potential harm of carbon black migration, eliminating the need for excessive carbon black usage while preventing soiling.
Solution Approach 2:
The release agent acts as an intermediary substance between the carbon black layer and the external environment (sewing needles, handling surfaces). This intermediary prevents direct contact and potential migration of carbon black particles, solving the fugitive carbon black problem without requiring changes to the carbon black layer itself or reducing its functional effectiveness.
3Object-affected harmful factors
If multiple separate coating operations are used for electromagnetic radiation blocking coatings, then light blocking performance is improved, but manufacturing productivity decreases
Solution Approach 1:
The patent combines multiple functional layers (light scattering layer and light-absorbing layer) into a single integrated foamed latex composition that can be applied in one coating operation. The foamed structure allows both light scattering pigments and carbon black to be incorporated simultaneously, eliminating the need for multiple separate coating steps while maintaining the light blocking performance of the multi-layer structure.
Solution Approach 2:
The single foamed latex composition performs multiple functions simultaneously: it provides light scattering through titanium dioxide and clays, light absorption through carbon black, and weight reduction through its foamed structure. This multi-functional formulation consolidates what would traditionally require multiple separate coating operations into one application, improving manufacturing productivity without sacrificing light blocking performance.
4Shape
If light colored foam coatings are applied to achieve desired hue, then appearance is improved, but coating thickness must be increased to maintain blackout capability
Solution Approach 1:
The patent creates a composite foamed latex system where light scattering pigments (titanium dioxide, clays) provide the desired light color and hue, while carbon black particles provide light absorption. The foamed structure adds volume and light scattering pathways without proportionally increasing mass. This composite approach allows achievement of both light color appearance and blackout capability at reduced coating thickness compared to using light scattering pigments alone.
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 results in a lightweight, flexible, and uniformly white light-blocking material with improved durability and reduced risk of opacifying agents escaping, maintaining desired light-blocking properties and appearance.
Implementation Method 1
the use of an untreated synthetic silica such as fumed silica or precipitated silica in the functional composition provides a desired uniform, white, and mottle free appearance
Implementation Method 2
an opacifying colorant different from all of the one or more additives of (c), which opacifying colorant absorbs electromagnetic radiation having a wavelength of at least 380 nm and up to and including 800 nm
Data Source
AI summary
An aqueous non-foamed functional composition formulation is disposed on a foamed opacifying layer in light-blocking, foamed opacifying elements. This non-foamed functional composition formulation has 0.5-15% solids and essential (i) and (iv) components and optional (ii), (v), (vi), and (vii) components. The components (i) untreated synthetic silica (fumed silica or precipitated silica) at 0.5-10 weight %; and a (iv) water-soluble or water-dispersible organic polymeric binder having a glass transition temperature (Tg) below 25° C. The weight ratio of the (i) untreated synthetic silica to the (iv) water-soluble or water-dispersible organic polymeric binder is 10:1 to 1:1. The optional components include: a (ii) solid or non-solid lubricant; a (v) crosslinking agent; a (vi) thickener; and a (vii) coating aid. Glass particles can also be present. The presence of the (i) untreated synthetic silica provides improved brightness, e.g. an L* value of at least 80, and uniform coatings in the resulting, foamed opacifying element.