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Process and apparatus for a nanovoided article

A technology of nano-voids and products, applied in the fields of preparing low-refractive-index coatings, equipment for preparing nano-void coatings, preparing nano-void products, and preparing nano-void coatings, can solve the limitation of size range and uniformity, available material types restrictions, etc.

Active Publication Date: 2013-11-06
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Washing steps can limit the size range and uniformity of the resulting pores or voids
These techniques are also limited by the types of materials available

Method used

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  • Process and apparatus for a nanovoided article
  • Process and apparatus for a nanovoided article
  • Process and apparatus for a nanovoided article

Examples

Experimental program
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example

[0084] The examples refer to the following materials and their sources.

[0085]

[0086]

example 1

[0087] Example 1: Nanoporous articles formed by polymerization in solution

[0088] A first coating solution comprising surface-modified nanoparticles is prepared. Surface-modified nanoparticles are reactive nanoparticles that will chemically bind to the polymer during polymerization.

[0089] Preparation of Reactive Nanoparticles: 400 g of Nalco 2327 colloidal silica dispersion was added to a 1 quart jar. In a separate container, mix 450 g 1-methoxy-2-propanol, 25.43 g 3-(methacryloxy)propyltrimethoxysilane and 0.27 g Prostab 5128 (1% by weight in water) together and then added to the colloidal silica dispersion with agitation. The jar was sealed and heated to 80°C for 17 hours to obtain a solution of the reactive surface modified nanoparticles.

[0090] Preparation of radiation curable hardcoat (RCHC) coating solution: Three acrylate monomers SR444 (400 g), SR238 (400 g) and SR506 (200 g) were combined and mixed to form a radiation curable resin. In a separate flask, 6...

example 2

[0098] Example 2: Control of Nanoscale Porosity and Refractive Index .

[0099]A radiation curable material solution (906 Hardcoat Solution) with silica nanoparticles was used to generate films polymerized using a range of UV LED power levels. The 906 hardcoat stock solution prepared by the method described in U.S. Patent 5,677,050 to Bilkadi et al., column 10, lines 25-39, and Example 1 was a composition comprising: 18.4% by weight of 20nm silica (Nalco 2327), 25.5% by weight of pentaerythritol tri / tetraacrylate (PETA), 4.0% by weight of N,N -Dimethacrylamide (DMA), 1.2% by weight of Irgacure 184, 1.0% by weight of Tinuvin 292, 46.9% by weight of isopropanol and 3.0% by weight of water. The 906 hardcoat stock solution was diluted to 35% solids with 1-methoxy-2-propanol to form the first coating solution. The first coating solution was applied to a 0.002 inch (0.051 mm) thick primer polyester (Melinex 617, DuPont Teijin Films) base web as Figures 3A-3C shown in .

[010...

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Abstract

A process and apparatus for producing a nanovoided article, a nanovoided coating, and a low refractive index coating is described. The process includes providing a first solution of a polymerizable material in a solvent; at least partially polymerizing the polymerizable material to form a composition that includes an insoluble polymer matrix and a second solution, wherein the insoluble polymer matrix includes a plurality of nanovoids that are filled with the second solution; and removing a major portion of the solvent from the second solution. An apparatus for the process is also described, and includes a webline, a coating section, a partial polymerization section, and a solvent removal section.

Description

Background technique [0001] Articles with nanoscale pore or void structures are useful in a variety of applications based on the optical, physical or mechanical properties provided by their nanovoided compositions. For example, a nanovoided article includes a polymeric solid network or matrix at least partially surrounding pores or voids. The pores or voids are typically filled with a gas, such as air. The size of the pores or voids in a nanovoided article can generally be described as having an average effective diameter that can range from about 1 nanometer to about 1000 nanometers. The International Union of Pure and Applied Chemistry (IUPAC) provides three size categories for nanoporous materials: micropores with voids smaller than 2 nm, mesopores with voids between 2 nm and 50 nm, and macropores with voids larger than 50 nm. Each of the different size classes described above can provide unique properties to the nanovoided article. [0002] Various techniques have been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28F26B13/10C08L33/06
CPCC08J2333/06C08J2201/05C08J9/28F26B13/10C08K9/00C08L33/06
Inventor 威廉·布雷克·科尔布郝恩才布兰特·U·科尔布大卫·L·菲利浦斯
Owner 3M INNOVATIVE PROPERTIES CO