JPH04110141A - Automotive resin extrusion molded product for exterior - Google Patents

Abstract

PURPOSE:To obtain the above molded product having excellent weatherability and heat resistance by constituting the molded product of a base material made of a rigid resin subjected to extrusion molding and the coating layer composed of a thermoplastic polyester elastomer provided to the outer surface of the base material by co-extrusion molding. CONSTITUTION:The base material 1 of a weather strip is obtained by forming polyvinyl chloride into a long shape by extrusion molding and has the car body mounting part 3 attached to a car body 2 and the glass bonding part 5 bonded to window glass 4. A coating layer 11 composed of a thermoplastic polyester elastomer is provided to the outer surface of the base material by co-extrusion molding. The thermoplastic polyester elastomer is based on an aliphatic polyester resin and also contains one wherein a benzene nucleus is copolymerized in a polymer. The coating layer is desirably formed as a membrane having thickness of 1mm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to resin extrusion molded products for the exterior of automobiles, such as window weather strips, side protection moldings, and glass runs.

[Prior art] Conventionally, as resin extrusion molded products for the exterior of automobiles,
For example, a window weather strip as shown in FIG. 3 is known.

FIG. 3 is a sectional view showing a conventional window weather strip.

In the figure, a base material 1 formed by extrusion molding a synthetic resin material into a long shape includes a vehicle body attachment part 3 to be attached to a vehicle body 2, and a glass bonding part 5 to be bonded to a windshield 4. As the molding material for the base material 1, polyvinyl chloride, which is inexpensive and has good moldability, is often used. The outer surface of the base material 1 constitutes a designed surface 8 of the window weather strip. A reinforcing insert 6 made of a metal plate such as stainless steel is embedded in the vehicle body mounting portion 3. Flocking 7 to reduce the sliding resistance of the window glass 4 at the glass joint 5
is provided.

According to the conventional window weather strip configured as described above, the base material 1 closes the gap between the vehicle body 2 and the windshield 4 to seal out rainwater, dust, and outside air. Also,
The design surface 8 of the base material 1 also improves the appearance.

Examples of this type of window weather strip include the techniques disclosed in Japanese Utility Model Application Publications No. 57-135417, Japanese Utility Model Application No. 57-144747, and Japanese Utility Model Application No. 56-132143.

[Problems to be Solved by the Invention] However, according to the conventional resin extrusion molded product for automobile exteriors as described above, polyvinyl chloride, which is the molding material of the base material 1, has poor weather resistance and heat resistance, so the design There were problems such as the gloss and color of the surface 8 deteriorated and the appearance deteriorated over time, or the glass joint 5 partially hardened and a seal failure occurred. .

SUMMARY OF THE INVENTION An object of the present invention is therefore to provide a resin extrusion molded product for automobile exteriors that has excellent weather resistance and heat resistance.

[Means for Solving the Problems] In order to solve the above problems, the resin extrusion molded product for automobile exteriors of the present invention includes an extruded synthetic resin base material and a base material formed by co-extrusion molding. It consists of a coating layer made of thermoplastic polyester elastomer provided on the outer surface. The thermoplastic polyester elastomer is an aliphatic polyester resin [-(CH2) m -COO-co].

It is a material mainly composed of , and also includes copolymerized benzene nuclei in the polymer.

[Function] Since this thermoplastic polyester elastomer has excellent weather resistance and heat resistance, the gloss and color of the coating layer constituting the designed surface can be maintained well for a long period of time. Furthermore, since thermoplastic polyester elastomer exhibits elasticity similar to vulcanized rubber at room temperature, sealing performance is also improved.

Moreover, since the thermoplastic polyester elastomer is easily plasticized at high temperatures, a thin film-like coating layer can be formed smoothly and beautifully on the outer surface of the base material. Moreover, since the coating layer is adhered to the base material by the adhesive force of the thermoplastic polyester elastomer itself immediately after extrusion, there is no need to use an adhesive, and the manufacturing process can be simplified.

[Example] Hereinafter, an example embodying the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a window weather strip showing one embodiment of the present invention. In addition, in the figure, the same reference numerals as in the conventional example indicate the same components as in the conventional example.

The base material 1 of the window weather strip in this embodiment is formed by extruding polyvinyl chloride into a long shape, as in the past, and includes a vehicle body attachment part 3 to be attached to the vehicle body 2 and a glass bonding part to be bonded to the windshield 4. It is equipped with part 5.

A reinforcing insert 6 made of a metal plate such as stainless steel is buried in the vehicle body attachment part 3, and a glass joint part 5
is provided with flocks 7 to reduce the sliding resistance of the window glass 4.

A coating layer 11 made of thermoplastic polyester elastomer is provided on the outer surface of the base material 1 by coextrusion molding. The thermoplastic polyester elastomer is an aliphatic polyester resin [-(CH2)l1l-CO
O-co.

It also includes polymers in which benzene nuclei are copolymerized. As a commercially available product, for example, the product name "
Anitel” (Agzo■), product name “Pelprene” (
Toyobo ■) and product name ``Hytrel'' (Toyobo ■) can be suitably used. Further, preferably, the coating layer 11 is formed in the form of a thin film with a thickness of 1 mm or less.

In this way, the window weather strip of this example is
It is composed of a base material 1 made of extruded polyvinyl chloride and a thin film-like coating layer 11 made of thermoplastic polyester elastomer and having a thickness of 1 mm or less provided on the outer surface of the base material 1 by coextrusion molding. It is.

Therefore, in the window weather strip of this embodiment, the coating layer 11 constituting the design surface 8 is
The gloss and color can be maintained well for a long period of time.

Furthermore, since the thermoplastic polyester elastomer exhibits elasticity similar to vulcanized rubber at room temperature, the sealing performance of the window weather strip is also improved. Moreover, since the thermoplastic polyester elastomer is easily plasticized at high temperature during extrusion molding, the thin film-like coating layer 11 can be formed smoothly and beautifully on the outer surface of the base material 1.

Moreover, since the covering layer 11 is adhered to the base material 1 by the adhesive force of the thermoplastic polyester elastomer itself immediately after extrusion,
There is no need to use adhesives, which simplifies the manufacturing process.

By the way, in the above embodiments, the present invention is embodied in a window weather strip, but the application of the present invention is not limited to this, and can be applied to side protection moldings, side protection moldings,
It is also possible to apply the present invention to various resin extrusion molded products used as exterior parts of automobiles, such as bumper moldings, window moldings, glass runs, or glass-integrated weather strips.

FIG. 2 is a cross-sectional view of a side protection molding for an automobile showing another example of application of the present invention.
A covering layer 11 made of a thermoplastic polyester elastomer is provided in the form of a thin film with a thickness of 1 mm or less on the outer surface of a base material 1 extruded into a long shape from polyvinyl chloride. This application example also provides the same effects as the above embodiment in the side protection molding of an automobile.

In each of the above embodiments, the thickness of the coating layer 11 is set to 1 mm or less, but the present invention is not limited to this. Therefore, the thickness of the coating layer 11 can be changed as appropriate.However, in the case of a window weather strip or side protection molding of normal specifications like the above embodiment, if the layer thickness is 1 mm or less, the thickness of the coating layer 11 can be changed as described above. Since sufficient effects can be obtained, the amount of relatively expensive thermoplastic polyester elastomer resin can be reduced, and material costs can be reduced.

In addition, although polyvinyl chloride is used as the molding material for the base material 1 in each of the examples described in L, the present invention is not limited to this, and various types of polyvinyl chloride that have good adhesion to thermoplastic polyester elastomer are used. The base material can also be extruded using synthetic resin materials.

[Effects of the Invention] As described above, the resin extrusion molded product for automobile exteriors of the present invention has a base material made of extruded synthetic resin and a thermoplastic resin provided on the outer surface of the base material by co-extrusion molding. Since it is composed of a coating layer made of polyester elastomer, the excellent weather resistance and heat resistance of thermoplastic polyester elastomer allows the gloss and color of the designed surface to be maintained well over a long period of time, and its elasticity provides excellent sealing properties. Moreover, the coating layer can be formed smoothly and beautifully on the outer surface of the base material, and it can be easily manufactured by utilizing the adhesive strength of the thermoplastic polyester elastomer itself.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a window weather strip showing one embodiment of the resin extrusion molded product for the exterior of an automobile according to the present invention, FIG. 2 is a cross-sectional view of a side protection molding showing another application example of the present invention, and FIG. The figure is a sectional view of a conventional window weather strip. In the figure, 1: base material 11: coating layer. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Patent applicant: Toyoda Gosei Co., Ltd. Agent: Patent attorney Higuchi Higuchi and 1 other person to the base material\

Claims (1)

[Claims] An automobile exterior resin comprising: a base material made of extruded synthetic resin; and a coating layer made of thermoplastic polyester elastomer provided on the outer surface of the base material. Extrusion molded product.