Thermoplastic olefin elastomer molded article

Details Thermoplastic olefin elastomer molded article Thermoplastic olefin elastomer molded article

1999-08-31

2001-05-08

Nakarani, D. S. (Department: 1773)

Land vehicles: bodies and tops

Bodies

Storm-front shield, apron, or robe

C428S119000, C428S120000, C049S475100

Reexamination Certificate

active

06227598

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a thermoplastic olefin elastomer (hereinafter abbreviated as TPO) molded article. More particularly it relates to a TPO molded article which has a sealant contact portion coming into contact with a urethane sealant and which consists substantially of a TPO material.
The present application is based on Japanese Patent Application No. Hei. 11-76595, which is incorporated herein by reference.
2. Description of the Related Art
The present invention will be described with particular reference to a molding
26
used at the periphery of an automobile windowpane as shown in
FIG. 1
(hereinafter simply referred to as a molding) for instance, but the invention is not limited thereto and is applicable to other moldings having a sealant contact portion, such as a roof molding
27
shown in
FIG. 4 and a
sealant dam
20
shown in FIG.
1
.
A window shield (windowpane)
12
is fitted into a window frame
14
formed by sheet metal working as follows. The window frame
14
is made up of a flange
16
forming the bottom (the car interior side) and an upright wall
24
.
A sealant
22
is fitted to the flange
16
. A window shield
12
having a sealant dam
20
adhered to the periphery thereof via a both-sided adhesive tape
18
is fitted into the frame
14
and pressed toward the car interior to press down the sealant
22
, whereby the window shield
12
is fixed to the flame
14
. Then a molding
26
is fitted into the space surrounded by the window shield
12
and the upright wall
24
.
The molding
26
basically comprises a main body
28
that is on the exterior side, a leg
30
that extends from the main body
28
toward the interior, and a sealant contact portion
32
that is provided at the tip of the leg
30
. The main body
28
has sealing lips
34
and
36
by which it hooks on to the exterior periphery of the windowpane
12
and the exterior periphery of the frame
14
, respectively. The sealant contact portion
32
has a lip
38
by which it hooks on to the interior periphery of the windowpane
12
and a lip
40
in friction contact with the upright wall
24
of the flame
14
.
The molding
26
has been produced by extruding polyvinyl chloride (hereinafter abbreviated as PVC), etc., cutting the profile, setting cut pieces of the profile in a mold, and making the corners by injection molding to obtain an annular molding.
A urethane sealant is generally used as the sealant
22
for its adhesion to glass, vibration damping properties, durability, and sealing properties. Since the sealant
22
and the molding
26
should have strong heat-resistant adhesion, the surface
32
a
of the sealant contact portion
32
of the PVC molding
26
which is to come into contact with the sealant
22
is usually coated with an isocyanate primer to secure adhesiveness.
From the viewpoint of environmental conservation and resources saving, it has been demanded to replace PVC with other molding materials. Hence the inventors have focused their study on TPO which has the lowest density in thermoplastic elastomers and made efforts in development. They have found, however, that a urethane sealant fails to have sufficient adhesion to TPO for practical use, particularly adhesive strength after a heat test. A primer that secures adhesion between a urethane sealant and TPO has not yet been developed.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a TPO molded article consisting substantially of a TPO material which exhibits practical adhesive strength to a urethane sealant.
The above object is accomplished by a TPO molded article which has a sealant contact portion and consists substantially of a TPO material, wherein the sealant contact portion has a PVC layer or a thermoplastic polyurethane (hereinafter abbreviated as TPU) layer on its surface coming into contact with a urethane sealant, and at least the portion of the molded article which adjoins the PVC layer or the TPU layer is made of a chlorinated TPO capable of thermal fusion bonding to the PVC layer or the TPU layer which is obtained by replacing part or the whole of the non-rigid phase of a TPO with chlorinated polyethylene (hereinafter abbreviated as PE).
The chlorinated TPO preferably has a chlorine content of 1 to 20% by weight to secure thermal fusion bonding to the PVC or TPU layer.


REFERENCES:
patent: 4833847 (1989-05-01), Inayama et al.
patent: 4889762 (1989-12-01), Uchiyama et al.
patent: 4953907 (1990-09-01), Sugita et al.
patent: 5752352 (1998-05-01), Goto et al.
patent: 5972492 (1999-10-01), Murakami et al.

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