Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2001-02-21
2004-05-11
Yoon, Tae H. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S413000, C524S430000, C524S431000, C524S493000, C524S494000, C428S689000
Reexamination Certificate
active
06734224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat radiation shield coating composition which can be applied onto roofs and outside walls of architectural structures, vehicles, ships, plants, sheds, cattle stalls and the like.
2. Description of Related Art
Coatings are applied onto various structures, such as roofs of architectural structures, to impart various color appearances thereto. However, carbon black, a typical black pigment for use in production of various color hues, tends to absorb a solar energy. This nature inevitably leads to elevation in temperature inside a structure having a coat formed from a carbon black containing composition, which impairs comfort of residential spaces and storage conditions of articles and also requires a huge energy consumption for air conditioning.
In Japanese Patent Laying-Open Nos. Hei 1-121371 (1989) and Hei 1-261466 (1989), the use of various metal oxide or mixed metal oxide pigments is disclosed for solar radiation shield pigments. Still, the use of conventional carbon black is necessary to obtain a coating that exhibits a high level of blackness, resulting in the reduced heat radiation shielding effect. Japanese Patent Laying-Open No. Hei 2-185572 (1990) proposes the use of a mixed oxide black pigment. This pigment however exhibits a solar radiation reflectance of below 8% and thus its heat radiation shielding effect is limited.
Japanese Patent Registration No. 2593968 and Japanese Patent Laying-Open No. Hei 05-293434 (1993) propose solar heat shield coating compositions colored in an achromatic black by blending chromatic pigments, such as red, orange, yellow, green, blue and purple pigments which exhibit high solar radiation reflectances in the ultraviolet and near infrared regions. However, prolonged use thereof likely results in problematic partial deterioration of those color pigments. This unbalances the initial color matching to cause a color change, which has been a problem.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a heat radiation shield coating composition containing a black pigment, which can form a coating film having a superior heat radiation shielding capability.
The heat radiation shield coating composition of the present invention contains a black pigment that exhibits a reflectance of not below 8.0% relative to a solar radiation in the 780-2,100 nm wavelength region.
Preferably, the black pigment exhibits a reflectance of not exceeding 15% to a radiation at any wavelength within the 400-700 nm visible region.
The black pigment may be a calcined pigment containing Fe
2
O
3
and also Cr
2
O
3
and/or Mn
2
O
3
in the total amount of 20-100% by weight.
The heat radiation shield coating composition may contain the above-specified black pigment in the amount of not below 0.1% by weight. Preferably, the black pigment accounts for at least 0.5% of the total weight of all pigments.
The heat radiation shield coating composition may preferably contain, as a binder component, a polyester, acrylic, fluoro or chloro resin. It may further contain a melamine resin and/or blocked isocyanate, when needed. A heat radiation shielding plate of this invention is a plate coated with the above-specified heat radiation shield coating composition.
As stated above, the heat radiation shield coating composition of the present invention contains a black pigment that exhibits a reflectance of not below 8.0% relative to a solar radiation in the 780-2,100 nm wavelength region.
The black pigment for use in the heat radiation shield coating composition exhibits a reflectance of not below 8%, preferably not below 15.0%, relative to a solar radiation. The solar radiation reflectance, as used herein, is described in JIS A 5759 and is defined therein as the solar radiation reflectance weighted by an intensity of a solar radiation at each wavelength in the 780-2,100 nm region. If the solar radiation reflectance is below 8.0%, sufficient heat radiation shielding characteristics may not be obtained. Accordingly, in the case where a coating composition containing such a black pigment is utilized to provide coatings on roofs and outside walls of architectural structures, vehicles, ships, plants, sheds, cattle stalls and the like, such coatings may fail to achieve sufficient reduction of temperature inside those structures.
The black pigment, as used herein, refers to a pigment that has a black—dark brown appearance.
Preferably, the black pigment with the above-specified solar radiation reflectance is a calcined inorganic pigment which contains Fe
2
O
3
and also Cr
2
O
3
and/or Mn
2
O
3
in the total amount of 20-100% by weight. Specifically, this calcined pigment is characterized as containing Fe
2
O
3
, as an essential ingredient, and also at least one of Cr
2
O
3
and Mn
2
O
3
. These ingredients are preferably contained in the calcined pigment in the total amount of 20-100% by weight, more preferably of 30-100% by weight. If the total amount is below 20% by weight, the calcined pigment may exhibit an insufficient heat radiation shielding capability.
The above-described calcined pigment is generally manufactured via calcination at a temperature of at least 600° C. and the subsequent pulverization.
The heat radiation shield coating composition of the present invention contains the black pigment as an essential component, but may further contain other color, body or bright pigment depending upon the color hue, end purpose and performance sought for the resulting coating. In such a case, the coating composition preferably contains the black pigment in the amount of at least 0.1% by weight. If the amount is below 0.1% by weight, it may fail to exhibit a sufficient heat radiation shielding performance. Also, the black pigment preferably accounts for at least 0.5% of the total weight of all pigment components. With the higher loading thereof, the resulting coating can exhibit the increased heat radiation shielding capability compared to conventional coatings of the same color hue. If the proportion by weight of the black pigment is reduced to below 0.5%, the resulting coating with the same hue may fail to exhibit a sufficient heat radiation shielding performance.
As stated above, the heat radiation shield coating composition of the present invention may further contain other color pigment than the black pigment or other type of pigment such as a body or bright pigment.
The other color pigment is used to adjust a hue of a coating and may be an organic or inorganic color pigment. Examples of organic color pigments include phthalocyanine, azo, condensed azo, anthraquinone, perinone/perylene, indigo/thioindigo, isoindolinone, azomethineazo, dioxazine, quinacridone, aniline black, triphenylmethane pigments and the like. Examples of inorganic color pigments include titanium oxide, iron oxide, iron hydroxide, chrome oxide, calcined spinel pigments, lead chromate, chrome vermilion, iron blue pigments, aluminum powder, bronze powder and the like.
Examples of body pigments include calcium carbonate, barium sulfate, silicon oxide, aluminum hydroxide and the like. Other applicable body pigments include organic cross-linked particles and inorganic particles.
Examples of bright pigments include a mica pigment, an aluminum foil, a tin foil, a gold leaf, a stainless steel foil and a metal foil pigment such as of nickel, copper or the like.
The type and form of the heat radiation shield coating composition of the present invention is not particularly specified. Its type can be thermosetting, thermoplastic, ambient drying, ambient curable or radiation curable. It can be provided in a solvent-borne, water-borne, non-aqueous emulsion, solvent-free or powder form.
The coating composition of the present invention may also contain a binder component, examples of which include acrylic, alkyd, polyester, silicone-modified polyester, silicone-modified acrylic, epoxy, polycarbonate, silicate, fluoro and chloro resins. The use of a polyester, acrylic, fluoro or chloro resin, among those resins, is preferr
Fujii Nobuto
Ishihara Ryoji
Mizutani Keita
Nippon Paint Co. Ltd.
Townsend & Banta
Yoon Tae H.
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