JPH0733212Y2 - Laminate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a functional film such as a liquid crystal dimmer or a polarizing film for controlling the light transmission state by applying a voltage.
The present invention relates to a laminated body for dimming or decoration, which is formed by laminating a plurality of transparent plate-like bodies, and particularly relates to an end face sealing structure of the laminated body.

[Prior Art] In recent years, attempts have been made to apply liquid crystal to windows for buildings or vehicles, etc. for light control for controlling light transmittance other than display, or for polarizing film for decoration. Has also been done.

A liquid crystal sheet or a polarizing film having a liquid crystal layer in which a liquid crystal substance is dispersed in a resin matrix is sandwiched between a pair of transparent films with electrodes as such a laminated body by two transparent plate-like bodies with an intermediate film interposed therebetween. Liquid crystal dimmers that are sandwiched and laminated are known, but functional films such as liquid crystal sheets and polarizing films generally shrink the film due to water infiltration, migration of plasticizer in the interlayer film, or the like. Since there are many things that impair the characteristics, please see
There are proposals such as 64-32522 and JP-A-2-24630.

However, since such a sealing structure is a curable sealant containing an organic solvent, the solvent may evaporate during the alignment process in the autoclave, and the interlayer film may be adversely affected such as foaming and peeling. In addition, there is a risk of damage due to lack of absorption when external force is applied. Also,
When the front and back surfaces of the substrate with electrodes are covered with a film with an adhesive as shown in FIG. 3 (B) of the latter, when two glass sheets are sandwiched with an intermediate film such as polyvinyl butyral to form a laminated glass. Since there is a step at the edge of the substrate, bubbles remain, and there is a defect that an unbonded portion between the substrate and the intermediate film occurs.

[Purpose of the Invention] The present invention has been made in view of the above points, and has excellent moisture resistance and water resistance, enhances absorption of external force without causing foaming or peeling of the interlayer film, and An object of the present invention is to provide a laminated body sealing structure with improved workability.

[Means for Solving Problems] The present invention relates to a laminated body in which a functional film such as a liquid crystal light control sheet or a polarizing film is sandwiched and laminated by two transparent plate-like bodies with an intermediate film interposed therebetween. The end face of the body,
It is characterized in that it is sealed with a plastic tape with a non-curable butyl rubber.

[Operation] In the present invention, after stacking not only the end faces of the functional film such as the liquid crystal light control sheet and the polarizing film, but also the end faces of the laminate,
Since the sealing material is used for sealing, the sealing material does not have an adverse effect such as foaming or peeling on the intermediate film during the alignment process.

In addition, since a non-curable plastic tape with butyl rubber that does not contain an organic solvent is used as the sealing material, it not only has high moisture resistance and water resistance, but also retains its plasticity before and after sealing, thus improving workability. It is good and has a high ability to absorb external force.

Embodiment Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 are schematic views of main parts showing a laminated body in Example 1 and Example 2 of the present invention, respectively.

Example 1 This is an example in which a liquid crystal light control sheet is used as the functional film 1, and the liquid crystal light control sheet is a transparent electrode 1 such as an ITO film or a NESA film.
Between the transparent films 1b and 1b ′ such as polyethylene terephthalate formed with a and 1a ′, a liquid crystal layer 1c in which a resin matrix such as an aliphatic epoxy resin or a urethane resin is impregnated with a liquid crystal composition such as a nematic liquid crystal is formed. This liquid crystal light control sheet 1 is sandwiched between two transparent plate-like bodies 2, 2 ', which are plate glasses, via an intermediate film 3, 3', such as polyvinyl butyral, for normal autoclave treatment. The laminated body 4 is obtained.

After that, over the entire length of the end face of the laminate 4, a plastic tape 5a made of polypropylene or the like is provided with a non-curable butyl rubber 5b having a non-curable thickness of about 1 mm and a non-curable butyl rubber at the center in the width direction of the plastic tape 5a. The tape 5 is pressed and sealed so that there is no void on the end face.

The laminate 4 thus obtained was subjected to an exposure test for 7 days in saturated steam at 50 ° C.-95%, and there was no abnormality in appearance and performance. Further, this laminate exhibited a milky white opaque property when no voltage was applied (no voltage applied), and a good transparency when an AC voltage of 100 V was applied to the transparent electrodes 1a and 1a '.

Example 2 This is an example in which a polarizing film made of polarized polyvinyl alcohol was used in place of the liquid crystal light control sheet as the functional film 1, and a plastic tape 5 with a non-curing butyl rubber was formed on a part of the front and back surfaces of the laminate 4. It has the same configuration as that of Example 1 except that it is covered and sealed so as to extend.

The laminate 4 thus obtained had no abnormality as in Example 1 in the 7-day exposure test in a saturated steam of 50 ° C.-95%, and the color changed depending on the visually recognizable angle, showing good decorativeness. It was On the other hand, the unsealed laminate was unpractical because the polarizing film contracted due to the intrusion of water.

The preferred embodiments have been described above, but the present invention is not limited to these, and various applications are possible.

For non-curable butyl rubber-attached plastic tape, plasticity is maintained even after sealing, and butyl rubber containing no organic solvent is preferably 0.5-1.0 mm thick and adhered to the plastic tape. Also polyethylene terephthalate,
A plastic tape such as polyester is suitable.
Further, since the laminated body is used by being housed in a window sash or the like, depending on its structure, it may extend to a part of the front and back surfaces of the laminated body as in the second embodiment, or the first embodiment.
Whether to stop at the end face portion as described above may be appropriately selected.

In addition to the liquid crystal sheet and the polarizing film of the examples, the functional film can be suitably applied to various films such as a decorative film in which a pattern is printed on polyethylene terephthalate, which is insensitive to moisture intrusion.

Regarding the transparent plate, in addition to plate glass, acrylic,
A transparent resin plate such as polycarbonate may be used. Further, the plate-like body may have a curved shape as well as a flat surface.

Regarding the interlayer film, in addition to polyvinyl butyral,
Various interlayer films such as ethylene vinyl acetate copolymer can be used.

[Advantage of the Invention] The laminate of the present invention is excellent in moisture resistance without peeling of residual bubbles in the intermediate film during the alignment process, and has improved absorbability against external force and improved workability.

[Brief description of drawings]

FIG. 1 and FIG. 2 are cross-sectional views of essential parts showing a laminated body in Example 1 and Example 2 of the present invention, respectively. 1 ... functional film 2,2 '... transparent plate 3,3' ... intermediate film 4 ... laminate 5 ... plastic tape with non-curable butyl rubber

Claims (1)

[Scope of utility model registration request] 1. A laminate in which a functional film such as a liquid crystal light control sheet or a polarizing film is sandwiched and laminated between two transparent plate-like bodies with an intermediate film interposed therebetween, and the end face of the laminate is a non-curable butyl rubber. A laminated body, characterized in that it is sealed with a plastic tape attached thereto.