Central Glass Company, Limited

Yasunobu Iida

Masato Nakamura

Nobuyuki Takeuchi

Hiroshi Nakashima

Koichi Furuya

Haruki Kuramashi

Hiroyuki Nishii

Toshikazu Nagashima

Toshiharu Yanai

Toshiaki Itoh

Sachio Asai

Junichi Suzuki

Keiji Onishi

Yoshihiro Yano

An ultraviolet absorbing multilayer coating formed on one side of a transparent substrate includes a first layer formed on a surface of the transparent substrate and a second layer formed on the first layer. The first layer is an ultraviolet absorbing film of a hardened primer coating of a synthetic resin which is mixed with a fluorescent brightening agent and an ultraviolet absorbing agent. The second layer is a film of a siloxane polymer. An optional infrared reflecting coating is interposed between the transparent substrate and the first layer. The ultraviolet rays until the upper limit of its wavelength can be substantially absorbed by the multilayer coating.

Glass plate with ultraviolet absorbing multilayer coating

The matter of concern is the reflection of a radio wave such as a television broadcast wave from a laminated panel having a substrate low in reflectance for radio waves and a layer relatively high in reflectance for radio waves. The reflection is greatly reduced by dividing the reflective layer into a plurality of discontinuous segments by a series of relatively narrow slits such that the width of each segment in the direction parallel to the direction of the electric field of the radio wave is not greater than 1/3 of the wavelength of the radio wave. The invention is suitable for application to a heat reflecting glass with a heat reflecting film having a surface resistivity below about 500 .OMEGA./.quadrature., and in that case it is preferable that the width of each segment of the heat reflecting film is not greater than 1/20 of the wavelength.

Laminated panel with low reflectance for radio waves

The invention provides a heat reflecting glass plate with a six-layer coating excellent in optical characteristics and also in durability on a transparent glass plate. The coating consists of (1) a metal oxide film deposited on the glass surface, (2) a metal nitride or oxynitride film deposited on the oxide film, (3) a metal film of Ti, Zr, Ta, Cr, Ni-Cr or stainless steel deposited on the nitride or oxynitride film to a thickness of 30-150 .ANG., (4) a metal nitride or oxynitride film overlying the metal film, (5) a metal oxide film overlying the film (4) and (6) a film of an oxide or oxynitride of Si-Al, Si-Ti or a film of aluminum nitride or oxynitride deposited on the film (5) to a thickness greater than 300 .ANG.. The metal for the oxide films (1) and (5) is Ti, Zr, Ta, Sn or Cr, and the metal for the nitride or oxynitride films (2) and (4) is Ti, Zr, Ta, Cr, Ni-Cr or stainless steel. Each of the oxide films (1) and (5) is 200-1000 .ANG. in thickness, and each of the nitride or oxynitride films (2) and (4) is 300-200 .ANG. in thickness. The heat reflecting glass plate is not lower than 30% in transmittance for visible light, not higher than 60% in transmittance for solar radiation and not higher than 20% in reflectance for visible light.

Neat reflecting glass with multilayer coating

The invention provides a heat insulating glass plate with a multilayer coating which is fairly low in transmittance for solar radiation and fairly high in transmittance for the visible light and also for radio waves. The multilayer coating is a lamination of transparent and dielectric layers and has three essential layers in which the middle layer is higher or lower in refractivity than the inner and outer layers. The coating may have five layers in which the second and fourth layers are higher or lower in refractivity than the remaining three layers. Each layer of the multilayer coating is a metal compound film deposited by sputtering or CVD. In a first embodiment of the three-layer coating each of the inner and outer layers is formed of SnO.sub.x, ZrO.sub.x, TaO.sub.x or AlN.sub.x having a refractive index of 1.8-2.1 and the middle layer is formed of TiO.sub.x having a refractive index of 2.2-2.5. In a second embodiment, each of the inner and outer layers is formed of SnO.sub.x, TiO.sub.x, ZrO.sub.x, TaO.sub.x, ZnO.sub.x, AlN.sub.x or SiN.sub.x having a refractive index of 1.8-2.5 and the middle layer is formed of SiO.sub.x, AlO.sub.x or Si.AlO.sub.x having a refractive index of 1.4-1.7. The heat insulating glass plates are useful as vehicle window glasses, and the second embodiment of the multilayer coating is very suitable for use in laminated glass.

Heat insulating glass with dielectric multilayer coating

The invention provides a heat reflecting glass plate with a multilayer coating on a transparent glass plate. The multilayer coating comprises a film of indium-tin oxide (ITO) of Al=N deposited on the glass surface, a heat reflective film of Ag or Cu deposited on the ITO or AlN film to a thickness of 40-200 .ANG., a metal Zn film deposited on the Ag or Cu film to a thickness of 20-200 .ANG. and an ITO or AlN film as the outermost layer. The multilayer coating may further comprise at least one set of the Ag or Cu film, metal Zn film and ITO or AlN film such that each Ag or Cu film overlies an ITO or AlN film and is overlaid with a metal Zn film and that the outermost layer is an ITO or AlN film. The multilayer coating is excellent in the fundamental characteristics as a heat reflecting and transparent coating and also in moisture resistance.

Heat reflecting glass plate with multilayer coating

A multilayer coating film is provided on one side of a transparent or semitransparent glass plate to afford a golden appearance to the coated glass plate at least when viewed from the uncoated side. Essentially the multilayer coating film is made up of a TiN layer adjacent to the glass plate surface and either a Ti layer or a Cr layer which overlies the TiN layer, and the coating film is formed such that the transmittance of the coated glass plate for visible light becomes not more than 40%. Optionally, the Ti or Cr layer is overlaid with either a TiO.sub.2 film or a Cr.sub.2 O.sub.3 film. Also optionally, either a TiO.sub.2 film or a Cr.sub.2 O.sub.3 film is interposed between the TiN layer and the glass plate surface. Each layer of the multilayer coating film can be formed by sputter deposition using a relatively simple method, an the multilayer coating has good durability.

Glass plate with reflective multilayer coatings to give golden appearance

The invention relates to a transparent glass board for use in document copying machines as the copying glass on which each sheet of original documents is placed and, in the case of copying machines of automatic document feed type, is forced to slide. To ensure good copying and smooth sliding carriage of original paper sheets, a transparent antistatic coating layer using tin oxide and/or indium oxide is formed on one or each of the top and back surfaces of a transparent glass, and a transparent lubricative coating layer using an organic silicon compound having isocyanate groups attached to Si atom is formed on the top side of the glass plate so as to provide a top surface with which each sheet of documents comes into contact. The antistatic layer has a thickness of 300-1500 .ANG. and the lubricative layer has a thickness of 300-2000 .ANG..

Growing community of inventors

Matsusaka, Japan

Yasunobu Iida