Compositions: coating or plastic – Coating or plastic compositions – Inorganic materials only containing at least one metal atom
Reexamination Certificate
2002-06-17
2003-10-14
Nakarani, D. S. (Department: 1773)
Compositions: coating or plastic
Coating or plastic compositions
Inorganic materials only containing at least one metal atom
C106S287190, C106S429000, C106S455000, C106S447000, C106S499000, C106S504000, C106S505000
Reexamination Certificate
active
06632274
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an ultrafine particle dispersion composition containing infrared ray shielding ultrafine particles (hereinafter referred to as “ultrafine particles”), a composition for an interlayer for a laminated glass, an interlayer employing it, and a laminated glass. Particularly, it relates to a fine particle dispersion composition wherein ultrafine particles are uniformly dispersed and whereby it is possible to obtain shaped resin products excellent in transparency and having the ultrafine particles uniformly dispersed, by incorporating it to various shaped resin products. Further, it relates to a composition for an interlayer capable of forming an interlayer which is transparent and excellent in the infrared ray shielding performance and which has a small haze value, when used as an interlayer for a laminated glass, an interlayer employing it, and a laminated glass.
BACKGROUND ART
Tin-doped indium oxide (hereinafter referred to as “ITO”), antimony-doped tin oxide (hereinafter referred to as “ATO”) or the like is used for various applications, such as infrared ray reflecting layers for window glasses for vehicles or for window glasses for buildings, or transparent electrodes for e.g. solar cells or for liquid crystal display devices, or transparent conductive layers for electroluminescence displays or for touch panels. A layer made of ITO or ATO is formed by a sputtering method, a vacuum vapor deposition method, a coating method or the like. In recent years, a method of forming a film having ultrafine particles of e.g. ITO or ATO, has attracted an attention. The forming method may be a method of coating a coating material containing the ultrafine particles on a film, or a method of kneading the ultrafine particles into a resin, whereby processing into a complicated shape will be possible. Among window glasses for vehicles or window glasses for buildings, there are some which are required to have functions for heat insulation, infrared ray shielding, etc. Especially, window glasses for vehicles are required to shield solar radiation energy entering into vehicles and thereby to suppress the temperature rise in the vehicles and air conditioning loads. Accordingly, glasses having the infrared ray shielding performance improved by imparting the infrared ray absorbing performance by adjusting the coloring or the composition of the glass itself or by forming an infrared ray reflecting layer made of a transparent thin layer of a metal oxide on the glass surface, are being used for window glasses for vehicles. However, if a thin layer of e.g. a metal oxide is formed on the glass surface, the glass will have electrical conductivity, whereby the radio wave transmittance will be decreased. Accordingly, it is likely that such a proposal is not applicable to various systems operable by radio wave signals, such as keyless entry systems for vehicles or automatic charging systems for future highways.
If functions such as an infrared ray shielding performance and radio wave transmittance, are imparted to an interlayer of a laminated glass to be used as a window glass (a front glass) in front of a driver sheet of a vehicle, such functions are useful as a window glass for a vehicle. Accordingly, JP-A-8-259279 proposes a laminated glass having functional ultrafine particles with particle sizes of at most 0.2 &mgr;m dispersed in an interlayer disposed between a pair of transparent glass sheets. With such a laminated glass, radio wave transmittance can be obtained, while shielding infrared rays and ultraviolet rays.
It is common that if fine particles are incorporated in an interlayer of a laminated glass, the haze value increases. Namely, with a laminated glass having ultrafine particles incorporated and dispersed in the interlayer, the haze value tends to be large. Therefore, with the laminated glass disclosed in the above publication, it is proposed to reduce the particle size of the fine particles to prevent increase of the haze value. Specifically, the same publication discloses that ultrafine particles having a particle size of at most 0.2 &mgr;m, preferably ultrafine particles having a particle size distribution of from 0.1 to 0.001 &mgr;m, more preferably from 0.03 to 0.01 &mgr;m, are preferred.
However, if the particle size of ultrafine particles is reduced, the ultrafine particles tend to be susceptible to oxidation. As a result, the infrared ray shielding performance of the ultrafine particles deteriorates. Thus, if the particle size is simply reduced as disclosed in the above publication in order to prevent increase of the haze value, no adequate infrared ray shielding performance can be obtained. As a result, it has been difficult to obtain a laminated glass having a desired infrared ray shielding performance, as well as a haze value where the visibility can be secured.
An object of the present invention is to provide an ultrafine particle dispersion composition which can be incorporated to various shaped resin products, thereby to obtain shaped resin products having ultrafine particles uniformly dispersed and being excellent in transparency.
Another object of the present invention is to provide a composition for an interlayer, whereby ultrafine particles can be uniformly dispersed in an interlayer for a laminated glass, thereby to obtain a laminated glass having small electrical conductivity and being excellent in the infrared ray shielding performance, an interlayer employing such a composition, and a laminated glass.
DISCLOSURE OF THE INVENTION
The present invention provides an ultrafine particle dispersion composition comprising a plasticizer and infrared ray shielding ultrafine particles dispersed in the plasticizer, wherein the average particle size of the infrared ray shielding ultrafine particles is from 10 to 60 nm, and the sum of volumes of infrared ray shielding ultrafine particles having particle sizes of at least 60 nm, is at most 15% of the sum of volumes of all particles. Further, the present invention provides an ultrafine particle dispersion composition comprising a plasticizer and infrared ray shielding ultrafine particles dispersed in the plasticizer, wherein the average particle size of the infrared ray shielding ultrafine particles is from 15 to 30 nm, and the sum of volumes of infrared ray shielding ultrafine particles having particle sizes of at least 40 nm, is at most 10% of the sum of volumes of all particles. These ultrafine particle dispersion compositions will be hereinafter referred to as “a liquid composition of the present invention”.
The present invention also provides a composition for an interlayer for a laminated glass (hereinafter referred to as “a film composition of the present invention”), comprising the above-mentioned ultrafine particle dispersion composition.
The present invention provides an interlayer for a laminated glass, having a resin material for an interlayer comprising a main constituting resin for an interlayer for a laminated glass, infrared ray shielding ultrafine particles and a plasticizer, formed into a film form, wherein the average particle size of the infrared ray shielding ultrafine particles is from 10 to 60 nm, and the sum of volumes of infrared ray shielding ultrafine particles having particle sizes of at least 60 nm, is at most 15% of the sum of volumes of all particles. Further, the present invention provides an interlayer for a laminated glass, having a resin material for an interlayer comprising a main constituting resin for an interlayer for a laminated glass, infrared ray shielding ultrafine particles and a plasticizer, formed into a film form, wherein the average particle size of the infrared ray shielding ultrafine particles is from 15 to 30 nm, and the sum of volumes of infrared ray shielding ultrafine particles having particle sizes of at least 40 nm, is at most 10% of the sum of volumes of all particles.
The present invention provides a laminated glass having a plurality of glass sheets laminated via the above interlayer for a laminated glass.
The liquid composition or the
Kawamoto Yoshimi
Nagai Kuniko
Okada Hitoshi
Osako Fuminori
Asahi Glass Company
Nakarani D. S.
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