JPH05514B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a framed window glass (hamegoroshi window glass) in which a transparent window glass part and its frame or sash part are integrally molded from synthetic resin, and a method for manufacturing the same. Since it is lightweight, safe, and economical, it is suitable as a frame window glass for automobile opera windows and the like.

Traditionally, "hamegoroshi window glass" consists of a frame made of metal, resin, wood, etc., and glass fitted into the frame. This thing is heavy,
Disadvantages include glass breakage, high costs due to the large number of parts and assembly man-hours, and low productivity.

As a method for improving or overcoming these drawbacks, the following methods can be considered.

In order to reduce the weight, a method of assembling the frame and the window by forming them respectively from synthetic resin may be considered. In this case, it is essential to apply a hard coat to the glass portion in order to impart surface hardness (scratch resistance). Hard coats can be applied either before or after assembling the frame. This method requires the same number of parts and assembly man-hours as the conventional method, and also has the disadvantage of requiring a hard coating process. Alternatively, the glass portion may be formed by hot bending an extruded plate or a casting plate, or by injection molding. When the plate is thermally bent, optical distortion is large. When using injection molding, it is necessary to use a highly fluid molding material, and since highly fluid molding materials generally have poor impact resistance and solvent resistance, they may cause cracks during hard coating, or There are drawbacks such as the tendency for physical property deterioration to occur later.

In order to reduce the number of parts and the number of assembly steps, a method of integrally molding the frame and the glass using synthetic resin may be considered. In this case, there are disadvantages in that a hard coating is required on the glass portion and the above-mentioned problems arise due to the use of a highly fluid molding material.

The present invention provides a window glass with a frame integrally molded from a synthetic resin that improves or overcomes the drawbacks of conventional methods and the like, and a method for manufacturing the same. That is,
The present invention is a synthetic resin framed window glass in which a frame and a window glass having at least an outer layer having a desired surface hardness are integrally molded, and the window glass portion is preliminarily coated with a hard coat film on one side. It is formed by laminating and integrating a polycarbonate resin film or sheet with a weight average molecular weight of 25,000 or more and a resin layer formed by injection molding, and the frame portion is formed by the injection molding. In particular, the resin layer and frame of the window glass portion formed by injection molding are composed of a polycarbonate resin having a weight average molecular weight of 20,000 to 25,000, and Framed window glass is produced by: (1) punching out a polycarbonate resin film or sheet with a weight average molecular weight of 25,000 or more, coated on one side with a hard coat film, into the same shape as the window glass to create a window glass-shaped punched piece; (2) the process of attaching the punched piece to the cavity part corresponding to the window glass part of a mold for molding a window glass with a frame; (3) the mold is closed, and molten resin is injected at high pressure by injection molding means to form a frame. and (4) the step of taking out the molded product from the mold, and further the step of punching out a thermoplastic plastic film or sheet coated with a hard coat film on one side. and the process of attaching the punched piece to the cavity part corresponding to the window glass part of a mold for forming a window glass with a frame, which are carried out simultaneously in the process of closing the mold. .

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is an example of an overall view of a window glass with a frame formed according to the present invention, and FIG.
It is a sectional view taken along line AA' in the figure. The molded product is one in which a frame 1 and a window glass 2 are integrally injection molded through a sprue 3 and a runner 4. FIG. 3 is an enlarged view of part B in FIG. 2, and shows a polycarbonate resin film or sheet 5, 5' coated with a hard coat film on one side and a resin layer 6 formed by injection molding of molten resin. are laminated and integrated. Furthermore, FIG. 4 is an explanatory view schematically showing the injection molding process according to the present invention, in which a thermoplastic plastic coated with a hard coat film on one side is attached in advance to a window glass molding mold 7, 7' with a frame. The film or sheet 5, 5' is thermally fused and integrated with the molten resin layer 6 flowing through the runner 4. Here, a thermoplastic plastic film or sheet 5 coated with a hard coat film on one side,
5' can be easily fixed to the mold cavity by static electricity, suction force such as vacuum, or other conventionally known methods.

A thermoplastic plastic film or sheet coated with a hard coat film on one side can be prepared by applying a hard coating agent such as epoxy resin, acrylic resin, amino resin, polysiloxane, etc. to the thermoplastic plastic film or sheet. by coating and then curing by means such as heat or ultraviolet light.

After the frame 1 of the framed window glass is manufactured by injection molding,
It is also easy to create a shape that has a function like a ventilation hole by metallizing it using methods such as electroplating or sputtering, and by changing the shape of the mold.

The present invention has been explained above with reference to the drawings, but the framed window glass of the present invention and its manufacturing method are as follows: - Since the frame and the window glass are integrally molded, the number of parts is reduced, improving productivity and reducing costs. becomes.

- Since the frame and window glass are molded from thermoplastic synthetic resin, it is lightweight, has excellent impact resistance, and is highly safe.

- A thermoplastic plastic film or sheet coated with a hard coat film on one side is heat-sealed and integrated with the molten resin layer in an injection mold, so it is possible to achieve the desired surface hardness (scratch resistance) without going through a special painting process. A framed window glass having a
It has excellent productivity and eliminates defects that tend to occur in the painting process.

- Since the molecular weight or melt flow value of the resin surface layer in contact with the hard coat film and the resin layer constituting the framed window glass substrate can be independently selected, cracks do not occur in the resin constituting the framed window glass substrate. without worrying about deterioration of physical properties.
Highly fluid molding materials can be used.

It has such characteristics.

Examples will be explained below.

Example 1 Production of a thermoplastic plastic film or sheet with a hard coat film applied on one side An acrylic primer was coated on one side of an extruded polycarbonate film (500 mm x 600 mm) with a molecular weight of 30,000 and a thickness of 100 μm using a wire bar coating method. was applied and dried. Next, a silicone top coat was applied onto the primer by a wire bar coating method and cured at 130°C for 1 hour.

Production of framed window glass with desired surface hardness The hard coat film formed film obtained in the previous step was
The window glass shape shown in the figure was cut out and mounted in a mold for a window glass with a frame having the shape shown in Figure 1. Then,
Polycarbonate resin with a molecular weight of 23,000 was injection molded.

The resulting framed window glass has the hard coat film forming film and the molded resin material part completely integrated.
No boundaries were identified. Further, no damage to the hard coat film or abnormal appearance was observed.

[Brief explanation of the drawing]

Fig. 1 is a perspective view for explaining the framed window glass of the present invention, Fig. 2 is a sectional view taken along line A-A' in Fig. 1,
FIG. 3 is a partially enlarged view of part B in FIG. 2, and FIG. 4 is a schematic diagram illustrating a state of injection molding of a window glass with a frame according to the present invention. The numbers in the diagram are 1...frame, 2...window glass, 3...sprue,
4...Runner, 5,5'...Single-sided hard coat film, 6...Resin layer by injection molding, 7,
7′...indicates a mold.

Claims (1)

[Scope of Claims] 1. A window glass with a frame made of synthetic resin, in which a frame and a window glass having at least an outer layer having a desired surface hardness are integrally molded, the window glass portion being coated with a hard coat film on one side in advance. Weight average molecular weight applied to
25,000 or more polycarbonate resin film or sheet and a resin layer formed by injection molding are laminated and integrated, and the frame portion is formed by the injection molding. window glass. 2. The framed window glass according to claim 1, wherein the resin layer and frame of the window glass portion formed by injection molding are made of a polycarbonate resin having a weight average molecular weight of 20,000 to 25,000. 3 (1) A step of punching out a polycarbonate resin film or sheet having a weight average molecular weight of 25,000 or more and having a hard coat film applied on one side in the same shape as the window glass part to create a window glass shaped punched piece, (2) said punching. (3) The mold is closed, and molten resin is injected at high pressure by injection molding means to form the frame and the window glass. A method for manufacturing a window glass with a frame, which includes the steps of integrally molding the molded product, and (4) taking out the molded product from the mold. 4. Punching out a polycarbonate resin film or sheet with a weight average molecular weight of 25,000 or more and having a hard coat film applied on one side, and attaching the punched piece to the cavity part corresponding to the window glass part of a mold for molding window glass with a frame. 4. A method for manufacturing a framed window glass according to claim 3, which comprises performing the step of closing the mold at the same time as the step of closing the mold.