JPH0131561Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to automobile interior parts,
More specifically, the present invention relates to automobile interior parts that not only have excellent physical performance but also excellent moldability and are suitable for mass production.

In recent years, the use of plastics has progressed in order to reduce the weight of automobiles, and some parts that require strength are also being replaced with plastics, and most of the interior parts have been replaced with plastics. however,
Automobiles require both interior and exterior design, which is desirable for car users, and at the same time, for manufacturers, it is important to differentiate their products.
Because it is desirable for promoting sales,
Attempts have been made to add various designs to automobile interior parts made of plastic. To give an example of conventional designs on automobile interiors, especially those with patterns, on printed sheets,
If necessary, a protective layer is provided on the surface and the back is attached via an adhesive layer, or the attachment involves forming such as vacuum forming, ABS that can be formed in advance,
After printing on a sheet of PVC, etc., after providing a protective layer if necessary, forming it by vacuum forming, etc., placing it in a mold, and integrally forming it by injection molding from the back side. In particular, the latter is often used because the design is completed at the same time as molding.

However, in the conventional design described above, it is essential to use a decorative sheet with moldability, so when designing a decorative sheet, moldability should be considered primarily, and other properties should be considered first. Normally, these are considered in secondary terms, and the various properties that are originally required after the product is manufactured, such as heat resistance, cold resistance, scratch resistance, surface hardness, weather resistance, and especially UV deterioration resistance. The current situation is that this is still not sufficient.

The present invention overcomes these conventional drawbacks, and in particular, by using a polyarylate resin layer as a surface protective layer for automobile interior parts, it has excellent moldability and achieves other performances as described above. We have succeeded in obtaining an automobile interior member that satisfies the above requirements.

The present invention will be explained in detail below using the drawings.

FIG. 1 is a sectional view showing one embodiment of the automobile interior member of the present invention, in which a decorative sheet 5 is closely integrated with a reinforcing material 6. FIG. 2 is a diagram showing the structure of the decorative sheet.

As the base material 1 of the decorative sheet 5 in the present invention, paper, metal foil or metal plate, plastic film or sheet, wood base material, etc. can be used, and examples of paper include tissue paper, bleached kraft paper, titanium paper, art paper, etc. Paper, coated paper, gypsum board paper, paperboard, etc.; metal foils or metal plates made of iron, aluminum, copper, tin, gold, silver, etc. or alloys thereof; plastic films or sheets such as polyethylene film, polypropylene; Films such as polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, polyethylene terephthalate film, polycarbonate film, nylon film, polystyrene film, ethylene vinyl acetate copolymer film, ethylene vinyl alcohol copolymer film, ionomer, etc. As the sheet and wood base material, so-called veneer made of thinly processed precious wood, etc., or composites thereof, etc. can be used.In addition, woven fabric, non-woven fabric, synthetic leather, natural leather, etc. can also be used, and the appearance and appearance can be adjusted according to the purpose. Select and use in consideration of performance and workability.

Next, the printing layer 2 can be provided on the base material as described above by printing using ordinary ink, and an appropriate vehicle is used as the ink. The vehicle is a mixture of ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, cellulose acetate and other cellulose derivatives, polystyrene, Styrene resins such as poly-α-methylstyrene and styrene copolymer resins, acrylic or methacrylic resins alone or copolymer resins such as polymethyl methacrylate, polyethyl methacrylate, polyethyl acrylate, polybutyl acrylate, rosin, rosin Modified maleic acid resin, rosin-modified phenolic resin, rosin ester resin such as polymerized rosin, polyvinyl acetate resin, coumarone resin, vinyl toluene resin, vinyl chloride resin, polyester resin, polyurethane resin, butyral resin, and what are some of these resins? Use different types or a mixture of
In addition, as printing methods using the above inks, known methods such as gravure printing method, offset gravure printing method, offset printing method, silk screen printing method, letterpress printing method, electrostatic printing method, jet printing method, etc. According to the printing method.

After providing the printing layer on the above-described base material as described above, a polyarylate resin layer 3 is provided on the printing layer.

The polyarylate resin constituting the polyarylate resin layer is a copolymer resin composed of terephthalic acid, isophthalic acid, and a dihydric phenolic compound such as bisphenol, and preferably has a molecular weight of 35,800 and a degree of polymerization of 100. U made by Co., Ltd.
Examples include polymer (trade name). The above polyarylate resin layer is formed by an extrusion method such as extrusion coating, with a melting temperature of 320°C to 350°C and a resin temperature of 200°C to 250°C when touching the printed layer provided on the base material. It is desirable that the polyarylate resin layer be laminated at the same time as extrusion, and the thickness of the polyarylate resin layer should be 50 μm to 100 μm.
m is preferred. The polyarylate resin may contain a colorant in advance, or a primer layer may be provided on the printing layer prior to providing the polyarylate resin layer.

Next, the polyarylate resin layer provided as described above is irradiated with ultraviolet rays. As ultraviolet light,
Using a light source such as an ultra-high-pressure mercury lamp, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a carbon arc, a xenon arc, etc., the ultraviolet light intensity on the surface to be irradiated is 600 to 800 W/cm, and the irradiation time is 30 to 60 seconds.

By irradiating the polyarylate resin layer with ultraviolet rays as described above, ultraviolet shielding properties are imparted to the polyarylate resin layer. The reason why the ultraviolet shielding property occurs is that some ester groups of the polyarylate resin constituting the polyarylate resin layer become 0-oxyketone structure due to Fries transition due to ultraviolet irradiation, and this 0-oxyketone structure plays the role of ultraviolet absorption. be. Furthermore, due to the 0-oxyketone structure, the polyarylate resin layer exhibits a slight yellow color, but
There is no problem in actual use with most decorative sheets except white.

Note that the above polyarylate resin layer may be subjected to a known embossing process.

The decorative sheet formed as described above is then molded into a desired shape. The forming method is preferably a vacuum forming method or a vacuum pressure forming method, but a method using a press may also be used, and the method may be selected depending on the shape, size, and material to be formed. In addition, when molding a decorative sheet, it is not necessary to exactly match the mold used in the method of providing reinforcing materials such as injection extensions, which will be described below.
It is sufficient if the shape approximates the shape of the mold.

Next, the molded decorative sheet is placed in a mold for molding such as an injection molding method so that the polyarylate resin layer serving as a protective layer is in contact with the inner surface of the mold, and then the base of the molded decorative sheet is placed. The sheet is molded from the material side by a molding method such as an injection molding method to integrate the molding resin and the molded decorative sheet. ABS is used as molding resin.
PVC, PP, PE, PET, nylon, etc. can be used.
Alternatively, a mixture of these with a foaming agent may be used.

Since the present invention has the above-mentioned structure, it has excellent heat resistance, cold resistance, scratch resistance, surface hardness, weather resistance, especially UV resistance, and can be mass-produced because it is easy to form decorative sheets. It is something.

The present invention will be explained in more detail with reference to Examples below.

Example: After gravure printing a wood grain on an ABS sheet with a thickness of 0.4 mm using a gravure ink using a vinyl chloride vehicle, polyarylate resin (U-100 manufactured by Unitika) was applied to the printed surface at a resin melting temperature of 350°C. Extrusion coating was performed at a resin temperature of 220° C. while adjusting the thickness to 80 μm. Next, a 160W/cm high-pressure mercury lamp was applied to the polyarylate resin layer for 5 minutes.
Using this method, irradiation was performed at a distance of 7 cm from the surface of the mercury lamp to the surface of the polyarylate resin at a speed of 10 m/min to form a decorative sheet.

Next, the above decorative sheet is formed by vacuum forming and placed in a mold set in an injection molding machine.
It was reinforced by injection molding ABS resin from the back side and used as an automobile interior component.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of an automobile interior member of the present invention, and FIG. 2 is a cross-sectional view showing the structure of a decorative sheet. DESCRIPTION OF SYMBOLS 1... Base material, 2... Printing layer, 3... Polyarylate resin layer, 5... Decorative sheet, 6... Reinforcement material.

Claims (1)

[Scope of utility model registration request] A decorative sheet comprising a printed layer and a polyarylate resin layer having at least a part of an 0-oxyketone structure sequentially provided on a base material is formed into a desired shape, and a decorative sheet is formed on the back side of the decorative sheet. is an automotive interior component made of injection-molded reinforcing materials that are tightly bonded and integrated.