Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified... – With charge transferring layer of specified composition
Patent
1992-05-28
1994-11-01
Thibodeau, Paul J.
Stock material or miscellaneous articles
Liquid crystal optical display having layer of specified...
With charge transferring layer of specified composition
428216, 428412, 428419, 4284258, 428457, 428458, 428460, 428461, 428463, 428480, C09K 1900, B32B 1504
Patent
active
053606477
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is the national stage of international application No. PCT/JP90/01246 filed Sep. 28, 1990, the specification of which is hereby incorporated by reference.
TECHNICAL FIELD
The present invention relates to a composite metal sheet, in which a liquid crystal polymer adheres to a metal sheet, usable at a high temperature.
BACKGROUND ART
With the recent demands for decrease in the weight, cost or the like of a motor vehicle or the like, there has been proposed a composite metal sheet obtainable by laminating metal sheets on one another with plastics. For example, Japanese Patent Laid-Open No. 84879/1976 and No. 84880/1976 disclose a light-weight laminated steel sheet in which a polypropylene sheet is being interposed between metal sheets. However, the polypropylene is poor in adhesion to metal, heat resistance, mechanical strength and dimensional stability. Particularly, the adhesion of polypropylene to metal is considerably lowered at a high temperature.
Japanese Patent Publication No. 15785/1979 discloses a composite metal sheet structure in which a polyamide sheet is being interposed between metal sheets. The polyamide used in this composite metal sheet is insufficient in mechanical characteristics at a low temperature, water resistance and adhesion to metal sheets. Particularly at a high humidity, polyamide is considerably decreased in the strength of adhesion to metal sheets.
It is an object of the present invention to provide a composite metal sheet in which a metal sheet is being securely bonded to a polymer layer.
It is another object of the present invention to provide a composite metal sheet having a high adhesive strength at a high temperature.
It is a further object of the present invention to provide a composite metal sheet in which a polymer layer excellent in mechanical characteristics, heat resistance, chemical stability, dimensional stability and water resistance is being bonded to a metal sheet.
DISCLOSURE OF THE INVENTION
To achieve the objects above-mentioned, the inventor have studied intensively and found that a liquid crystal polymer excellent in mechanical characteristics, heat resistance, chemical resistance and the like is securely bonded to a metal sheet, thus accomplishing the present invention. More specifically, the present invention provides a composite metal sheet in which a liquid crystal polymer layer containing a thermotropic liquid crystal polymer is being laminated on at least one surface of a metal sheet.
The present invention also provides a composite metal sheet in which at least two metal sheets are bonded to each other with a liquid crystal polymer layer containing a thermotropic liquid crystal polymer.
The thermotropic liquid crystal polymer include, for example, a polyester, a polythiol ester, a polyester amide, a polyazomethine and a polyester carbonate. Fully aromatic polyesters and fully aromatic polyester amides are preferred as the liquid crystal polymer.
In the specification, the term "liquid crystal polymer" refers to a thermotropic liquid crystal polymer and its compositions adapted to be moldable as flowingly softened when heated, and also adapted to form an anisotropic molten phase presenting birefringence when molten.
The term "film" refers to all relatively thin and substantially flat structures which may also be called "sheets" in the technical field to which the present invention pertains.
These objects and advantages of the present invention will be more understood from the following detailed description with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view illustrating an example of steps of continuously manufacturing a composite metal sheet of the present invention; and
FIG. 2 is a schematic view of steps of continuously degreasing a metal sheet.
DETAILED DESCRIPTION OF THE INVENTION
As to the liquid crystal polymer which may be used in the practice of the method of the present invention, there may be referred to, for example, U.S. Pa
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patent: 4384016 (1983-05-01), Ide et al.
patent: 4737388 (1988-04-01), Ikenaga et al.
patent: 4737398 (1988-04-01), Ikenaga et al.
patent: 4963428 (1990-10-01), Harvey et al.
Carl Smith "Metallic Glasses for Magnetic Switches"; IEEE Conf. Record of 15th Power Modulator Symposium; Jun. 14-16, 1982; pp. 22-27.
Daicel Chemical Industries Ltd.
Kiliman Leszek
Thibodeau Paul J.
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