Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
1998-12-04
2001-09-04
Hess, Bruce H. (Department: 1774)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C428S220000, C428S332000, C428S412000, C428S480000, C428S500000, C428S913000
Reexamination Certificate
active
06284354
ABSTRACT:
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a heat ray screening film laminate and to a heat ray screening transparent resin structure comprising a transparent resin sheet and the laminate formed on the transparent resin sheet. More specifically, it relates to a heat ray screening transparent resin structure which comprises a transparent resin sheet and a heat ray screening film formed on one side of the transparent resin sheet and which is lighter and safer and has higher workability than transparent glass and to a heat ray screening film laminate for the structure.
Since the heat ray screening transparent resin structure of the present invention is a sheet structure having transparency and a heat ray screening function, it is lighter and safer and has higher workability than conventionally used glass or glass window and has an excellent effect of maintaining temperature within a space due to its heat ray screening function.
A heat ray screening film laminate is generally a laminate comprising a transparent polyester film as a base film and an optical laminate (heat ray screening layer) consisting of a metal thin film layer of gold, silver, copper or the like and transparent dielectric layers having a high refractive index which sandwich the metal thin film layer. The heat ray screening film laminate transmits visible radiation but reflects the radiation of near infrared to infrared regions well.
Making use of this property, the heat ray screening film laminate is used to reduce heat radiation from a monitoring window at a high-temperature working site, screen solar energy input from the window of a building, car or train to improve an air-conditioning effect, improve the heat screening properties of a transparent plant container or improve the cooling effect of a refrigerating show case.
Most of the base materials of these transparent openings are made of a glass sheet to which a heat ray screening film laminate is adhered by a self-adhesive.
In recent years, more and more transparent resin (plastic) sheets have been used in place of glass sheets because they are less dangerous, more easily handled, lighter in weight and more inexpensive and have higher workability than glass sheets. When a heat ray screening film laminate is adhered to such a laminate by a conventional self-adhesive, air bubbles are readily formed by residual gas generated from the self-adhesive at high temperatures, thereby impairing the transparent appearance of the structure.
To solve this problem, various types of self-adhesives have been studied. However, one which can satisfy requirements for practical application could not be found yet because fluctuations in adhesion caused by the time changes of the self-adhesive and the tackiness of the self-adhesive itself deteriorate handling properties within the process.
Although the inventor of the present invention tried a process for thermally contact-bonding a heat ray screening film laminate to a transparent resin sheet directly, a structure having excellent bond strength and transparency could not be obtained. Even when a transparent resin sheet was formed by feeding a molten resin onto the surface of a heat ray screening film laminate, a structure having excellent bond strength could not be obtained and the heat ray screening film laminate was easily broken.
It is a first object of the present invention to provide a heat ray screening film laminate which can be firmly and easily bonded to a transparent resin sheet which is used as a base material for a transparent opening or the like.
It is a second object of the present invention to provide a transparent structure having fine appearance and comprising a heat ray screening film laminate and a transparent resin sheet which are firmly bonded together.
The present inventor has conducted studies to attain the above objects and has found that when a transparent resin film of a resin having a melting point lower than the melting point of a resin forming a heat ray screening film in a specified range is formed on one side of the heat ray screening film, a transparent resin sheet is bonded to the heat ray screening film through the transparent resin film and the adhesion surface of the transparent resin film is firmly bonded and has fine appearance.
According to the present invention, there is provided the following heat ray screening transparent resin structure. This heat ray screening transparent resin structure comprises:
(1) a heat ray screening film (A) having a heat ray screening layer on one side,
(2) a transparent resin film (B), and
(3) a transparent resin sheet (C), all of which are laminated together in the order named, and is characterized in that:
(i) the ratio (Tm/Tmr) of the melting point (Tm) of a resin forming the transparent resin film (B) to the melting point (Tmr) of a resin forming the heat ray screening film (A) is 0.5 to 0.95,
(ii) the haze value of a laminate comprising the heat ray screening film (A) and the transparent resin film (B) is 5% or less,
(iii) the integrated transmittance of visible radiation having a wavelength of 400 to 750 nm of the laminate is 55% or more, and
(iv) the integrated transmittance of near infrared radiation having a wavelength of 750 to 2,100 nm of the laminate is 50% or less.
According to the present invention, there is also provided the following heat ray screening film laminate.
The heat ray screening film laminate comprises:
(1) a heat ray screening film (A) having a heat ray screening layer on one side, and
(2) a transparent resin film (B), all of which are laminated together in the order named, and is characterized in that:
(i) the ratio (Tm/Tmr) of the melting point (Tm) of a resin forming the transparent resin film (B) to the melting point (Tmr) of a resin forming the heat ray screening film (A) is 0.5 to 0.95,
(ii) the haze value of the laminate comprising the heat ray screening film (A) and the transparent resin film (B) is 5% or less,
(iii) the integrated transmittance of visible radiation having a wavelength of 400 to 750 nm of the laminate is 55% or more, and
(iv) the integrated transmittance of near infrared radiation having a wavelength of 750 to 2,100 nm of the laminate is 50% or less.
The present invention will be described in detail hereinunder. A description is first given of the heat ray screening film laminate and then of the heat ray screening transparent resin structure and its production process.
As described above, the heat ray screening film laminate of the present invention comprises (1) a heat ray screening film (A) having a heat ray screening layer on one side and (2) a transparent resin film (B).
A base film forming the above heat ray screening film (A) is preferably a thermoplastic resin film which is transparent, flexible and heat resistant to stand operation temperature when a metal deposited film is formed by sputtering or vacuum deposition.
Polymers which can form the thermoplastic resin film include polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, aliphatic polyamides, aromatic polyamides, polyethylene, polypropylene and the like. Out of these, polyesters are preferred. Out of thermoplastic resin films, a biaxially oriented polyethylene terephthalate film having excellent heat resistance and mechanical strength is particularly preferred.
The thermoplastic resin film (base film) can be produced by conventionally known methods. For example, a biaxially oriented polyester film can be produced by drying a polyester chip, melting the chip with an extruder at a temperature of Tm to (Tm+70)°C. (Tm: melting point of polyester), extruding it onto a rotary cooling drum from a die (such as a T-die or I-die), quenching at 40 to 90° C. to form an unstretched film, stretching the unstretched film to 2.5 to 8.0 times in a longitudinal direction at a temperature of (Tg−10) to (Tg+70)°C. (Tg: glass transition temperature of polyester) and to 2.5 to 8.0 times in a transverse direction and heat setting the biaxially oriented film at a temperature of 180 to 250° C. for
Hess Bruce H.
Shewareged B.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Teijin Limited
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