Process for making a optical transparency having a diffuse antir

Details Process for making a optical transparency having a diffuse antir Process for making a optical transparency having a diffuse antir

1996-11-12

1999-09-07

McCamish, Marion

Coating processes

Applying superposed diverse coating or coating a coated base

Metallic compound-containing coating

427164, 427402, 427379, 4273977, 4274301, 428330, 428331, 428446, 428448, 428688, 428402, 10628716, 10628719, B05D 138

Patent

active

059484810

ABSTRACT:
A coated transparency, and method for making it, is disclosed, the transparency having a multi-layer antireflection coating that provides high transmittance with low specular reflectance, yet that also provides reduced visibility of surface defects. The coating includes alternating layers of polymerized silicon dioxide and polymerized titanium dioxide on a transparent substrate, with at least one of the layers incorporating discrete particles having a refractive index different from that of surrounding polymer. This provides the coating with a diffuse reflectance that is comparable to, or larger than, its specular reflectance, yet that still is negligible when compared to the coating's transmittance. The diffuse reflectance creates a loss of contrast for any reflected image or glare, thus masking any surface defects and providing a comfortable visual appearance. The successive layers of the antireflection coating are deposited on the substrate by applying separate solutions of an alkoxide, an alcohol, and water, and by curing the layer at an elevated temperature before the next succeeding layer is applied.

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patent: 4409285 (1983-10-01), Swerdlow
patent: 4816333 (1989-03-01), Lange et al.
patent: 4945282 (1990-07-01), Kawamura et al.
patent: 5215839 (1993-06-01), Yu
patent: 5450238 (1995-09-01), Bjornard et al.

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