Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Reexamination Certificate
2000-01-18
2002-05-07
Le, Hoa T. (Department: 1773)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
C428S328000, C428S336000, C428S337000, C428S447000, C523S102000
Reexamination Certificate
active
06383625
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel antifouling infrared shielding film and a process for producing the film. More particularly, the present invention relates to an antifouling infrared shielding film showing excellent transparency, scratch resistance and antifouling, cleaning, slipping and infrared shielding properties and advantageously used for attaching to window panes and plastic boards for windows and a process for producing the film efficiently.
2. Description of the Related Arts
Plastic films have been used as films attached to window panes and plastic boards for windows for various purposes.
The sun light coming into a room through a window pane contains ultraviolet light and infrared light in addition to visible light. Ultraviolet light contained in the sun light causes sunburn and adverse effects of the ultraviolet light on human bodies are recently mentioned. It is also well known that ultraviolet light causes degradation of packaging materials to deteriorate the contents. Infrared light contained in the sun light causes problems such as an increase in the room temperature by the light directly transmitted into the room to reduce the efficiency of air conditioning during the summer time. To prevent these undesirable phenomena, ultraviolet shielding films and infrared shielding films are attached to window panes and plastic boards for windows.
It is also generally practiced that films for preventing sight from the outside are attached to window panes and plastic boards for windows so that watching the inside of a room from the outside is made difficult. Films for preventing scattering of fragments are attached to window panes to prevent scattering of fragments of glass fractured in a disaster such as earthquake. The ultraviolet shielding films, the infrared shielding films and the films for preventing sight from the outside described above also exhibit the effect of preventing scattering of fragments.
The above films attached to window panes and plastic boards for windows (hereinafter, occasionally referred to as window films) generally have a hard coat layer on the face thereof to provide the films with scratch resistance. The hard coat layer is formed by coating the face of the film with a resin of the ionizing radiation curing type such as a polyester acrylate resin, an epoxy acrylate resin, a urethane acrylate resin and a polyol acrylate resin and curing the resin.
Methods for providing windows of buildings, vehicles and refrigerated or freezing showcases with the property to reflect or absorb the heating radiation (infrared light) have been proposed to reduce heat and to save energy. For example, methods of attaching films for reflection of heating radiation to windows have been proposed, in which the films have thin films of metals such as aluminum, silver and gold formed on the surface of transparent film substrates in accordance with the sputtering process or the vapor deposition process, (Japanese Patent Application Laid-Open Nos. Showa 57(1982)-59748 and Showa 57(1982)-59749).
However, the thin films formed in accordance with the sputtering process or the vapor deposition process have drawbacks in that transparency is poor to cause poor transmittance of visible lights through window panes when the films are attached to window panes, that the films give reflection with metallic gloss to cause undesirable appearance and that cost of production increases although these films have an excellent property for shielding heating radiation.
Recently, to improve the above drawbacks, various infrared shielding films having an infrared shielding layer which comprises inorganic or organic infrared absorbents and is disposed on a substrate film have been proposed (for example, Japanese Patent Application Laid-Open Nos. Heisei 7(1995)-100996, Heisei 8(1996)-281860, Heisei 9(1997)-108621 and Heisei 9(1997)-156025).
The above infrared shielding films show excellent transparency and infrared shielding property and are useful as films attached to window panes of buildings and vehicles. However, more advanced performances are recently required for various products. Highly functional films having excellent scratch resistance, antifouling property which shows suppressed adsorption of dusts, cleaning property which shows easy removal of dusts and slipping property (in particular for films attached to windows of automobiles) in addition to excellent transparency and infrared shielding property are required as the films attached to window panes. No conventional infrared shielding films can satisfy all these requirements. Development of an infrared shielding film satisfying all these requirements have been desired.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a highly functional antifouling infrared shielding film which shows excellent transparency, scratch resistance and antifouling, cleaning, slipping and infrared shielding properties and is advantageously used for attaching to window panes and plastic boards for windows and a process for producing the film.
As the result of intensive studies by the present inventors to develop an antifouling infrared shielding film showing the above excellent properties, it was found that the above object can be achieved by a film obtained by coating one face of a transparent substrate film with a coating fluid comprising a resin of the ionizing radiation curing type, an infrared absorbent and a silicone resin of the ionizing radiation curing type in a specific relative amount to form a coating layer and then curing the formed coating layer by irradiation of ionizing radiation to form an infrared shielding layer. The present invention has been completed on the basis of this knowledge.
The present invention provides:
(1) An antifouling infrared shielding film comprising a transparent substrate film having, on one face thereof, at least an infrared shielding layer which comprises a cured product of a coating layer comprising (A) a resin of an ionizing radiation curing type, (B) an infrared absorbent and (C) a silicone resin of an ionizing radiation curing type in an amount of 0.1 to 50 part by weight per 100 parts by weight of the resin of an ionizing radiation curing type;
(2) A film described in (1), wherein the infrared absorbent of component (B) is an inorganic infrared absorbent;
(3) A film described in any of (1) and (2), wherein the infrared shielding layer has a thickness of 0.5 to 20 &mgr;m; and
(4) A process for producing an antifouling infrared shielding film comprising coating one face of a transparent substrate film with a coating agent comprising (A) a resin of an ionizing radiation curing type, (B) an infrared absorbent and (C) a silicone resin of an ionizing radiation curing type in an amount of 0.1 to 50 part by weight per 100 parts by weight of the resin of an ionizing radiation curing type to form a coating layer and curing the formed coating layer by irradiation of an ionizing radiation.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The transparent substrate film used for the antifouling infrared shielding film of the present invention is not particularly limited and a suitable film can be selected from various types of transparent plastic films in accordance with the situation. Examples of the transparent plastic film include films of polyolefin resins such as polyethylene, polypropylene, poly-4-methylpentene-1 and polybutene-1; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polycarbonate resins; polyvinyl chloride resins; polyphenylene sulfide resins; polyether sulfone resins; polyethylene sulfide resins; polyphenylene ether resins; styrene resins; acrylic resins; polyamide resins; polyimide resins and cellulose resins such as cellulose acetate; and laminate films of these films. Among these films, films of polyethylene terephthalate are preferable.
The thickness of the transparent substrate film is not particularly limited and can be suitably selected in accordance with the application. The thickness is gener
Onozawa Yutaka
Shoshi Satoru
Watanabe Shunpei
Frishauf, Holtz Goodman, Langer & Chick, P.C.
Le Hoa T.
Lintec Corporation
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