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Antisoiling coatings for antireflective surfaces and methods of prepn

An anti-fouling coating and anti-reflection technology, which is applied to the device, coating, special surface, etc. of the surface coating liquid, can solve the problems of poor anti-fouling performance, and achieve the effect of improving reflectivity and easy coating

Inactive Publication Date: 2001-02-14
3M CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although perfluoroether derivatives such as those available from E.I. DuPont de Nemours Co., Wilmington, DE under the tradename KRYTOX 157 FS(L) have been used as lubricants on magnetic media articles and hard disk surfaces, However, it provided only poor stain resistance when applied to the transparent substrate shown in Comparative Example D

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0050] The advantages of the invention are illustrated by the following examples. However, the specific materials and amounts employed in these examples, as well as other conditions and details, are those widely known in the art and should not be construed to unduly limit the invention.

[0051] Material

[0052] Methyl perfluorobutyl ether was purchased from 3M Chemicals, 3M Company, St. Paul, MN, with the trade designation HFE-7100. The alkoxysilanes 3-aminopropyltrimethoxysilane and 3-aminopropyltriethoxysilane were purchased from Aldrich Chemical Co., Milwaukee, WI, while 3-aminopropylmethyldiethoxysilane was purchased from Gelest, Inc., Tullytown, PA. Fluorinated silane C 7 h 15 CH 2 OCH 2 CH 2 CH 2 SiCl 3 and C 7 h 15 CH 2 OCH 2 CH 2 CH 2 Si(OC 2 h 5 ) 3 Prepared according to the methods described in Examples 1 and 5 of US Pat. No. 5,274,159 (Pellerite et al.), respectively. C 7 f 15 CONHCH 2 CH 2 CH 2 Si(OCH 3 ) 3 Prepared as described in Exam...

Embodiment 1-6

[0070] A 0.1% by weight (wt%) solution of methyl perfluorobutyl ether was prepared from the perfluoropolyether 3-aminopropyl alkoxysilane shown in Table 1. Each solution was coated with a No. 6 wire wound rod (available from RD Specialties, Webster, NY) to prepare hand coats on the polyester substrates described above. The coated samples were dried in a forced air oven at 120°C for 2 minutes. Cooled after removal from oven, tested with the SHARPIE Black Permanent Marker Ink / Dry Erase Analysis Cycle described above. All samples showed that the permanent ink beaded into discrete small droplets which were easily wiped off with a dry cloth. This test was run for a total of five ink / dry erase cycles without loss of ink beading and scavenging performance. In contrast, the substrate without the anti-smudge coating on the anti-reflective coating was completely writable and the ink could not be wiped off with a dry cloth.

[0071] Example

Embodiment 7-14 and comparative example A-G

[0073] A 0.25% by weight solution of methyl perfluorobutyl ether was prepared using the compounds shown in Table 2. Each solution was coated on the aforementioned substrates using the coating method described in Examples 1-6. The coated samples were dried in a forced air oven at 120°C for 2 minutes. After removing from the oven, let it sit at ambient conditions for 2 days. These samples were tested with the SHARPIE Black Permanent Marker Ink / Dry Erase Analysis Cycle described above. The results of this test are listed in Table 3.

[0074] Example

[0075] Example

[0076] The experimental data in Table 3 clearly demonstrates that alkoxysilane-functional perfluoropolyethers with a molecular weight greater than 1000 (such as Examples 7, 11, 13, 14) are more effective than non-alkoxy-functional existing materials (Comparative Example B and D) and performance advantages of alkoxysilane-functional fluorochemicals with a molecular weight less than 1000...

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Abstract

The present invention discloses anti-fouling coatings for anti-reflective surfaces, in particular the outer surfaces of anti-reflective film laminates, said anti-fouling coatings comprising fluorinated silicones, preferably by coating fluorinated Coating compositions of silanes having a number average molecular weight of at least about 1000 and using the general formula (I) R f -[-R 1 -SiY 3-x R 2 x ] y In the formula, R f Is a monovalent or divalent polyfluoropolyether group, R 1 is a divalent alkylene group, an arylene group, or a combination thereof; R 2 is lower alkyl, Y is halogen, lower alkoxy, or lower acyloxy; x is 0 or 1; y is 1 or 2.

Description

Background of the invention [0001] The glare or reflection of light can reduce the transparency of glass or plastic on doors, windows, lenses, filters, displays (such as display panels) of electronic instruments. To reduce the amount of glare on plastic or glass, for example, such surfaces typically include single layers of metal oxides (eg, silicon dioxide), metal fluorides, metal nitrides, metal sulfides, and the like. These coatings are used as anti-reflective coatings. [0002] For example, a glass surface has about 4% surface reflection. This surface reflection in the 450-650 nanometer (nm) region of the visible spectrum can be reduced to below about 0.5% of the average total intensity by means of special coatings, such as metal oxides. These coatings can be sub-micron thick deposited layers of dielectric materials used to induce constructive or destructive interference of light waves of different wavelengths. Anti-reflection materials in the visible spectrum generally...

Claims

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Application Information

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IPC IPC(8): C09K3/00C09D4/00C09D5/00C09D183/08C09D183/12
CPCC09D4/00Y10T428/3154C09D183/12Y10T428/31663Y10T428/31507Y10T428/265Y10T428/31667C08G77/24C08G77/00C08J7/04B05D5/00B05D5/06C08K5/5406C08K5/06C08J7/08B05D3/0254B32B33/00B32B2307/40B32B2307/70
Inventor J·M·英维M·J·佩莱里特
Owner 3M CO
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