JP2000025087A - Glass run channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a product having excellent flexibility by manufacturing a styrene thermoplastic elastomer of a surface treating material of a glass run containing a thermoplastic elastomer or vulcanized EPDM compound as a base material by co-extrusion molding. SOLUTION: A styrene thermoplastic elastomer is manufactured of a surface treating material 2 of a glass run containing a thermoplastic elastomer or vulcanized EPDM compound as a base material 1 by co-extrusion molding. As the thermoplastic elastomer, a block copolymer having a polystyrene in a hard segment, a polybutadiene or polyisoprene or polyolefin in a soft segment is used. As a type of the copolymer, styrene.butadiene.styrene, styrene.isoprene.styrene, styrene.ethylene/butylene.styrene obtained by adding hydrogen thereto to form a rubber block as a saturation type or the like is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a surface treatment means for a glass run channel for guiding sliding of a window glass of an automobile.

[0002]

2. Description of the Related Art Elastomer refers to a polymer material that exhibits rubber elasticity at room temperature, and is a synthetic resin that greatly expands at room temperature and instantly returns to almost its original shape when external force is removed.

[0003] Thermoplasticity softens and flows when heated,
The property of becoming hard again when cooled, and the linear polymer compound has this property.

[0004] Polystyrene is a linear polymer chemical having the structure shown below.

[0005]

Embedded image

[0006] EPDM is a copolymer of ethylene and propylene in which a small amount of an unsaturated compound having a double bond as a third component (eg, 1,4-hexadiene, dicyclopentadiene,
Ethylidene norbornene).

[0007] The compound refers to an admixture obtained by adding various compounds to a synthetic resin or rubber so that it can be molded and processed as it is.

For vulcanization, FIG. 1A shows an unvulcanized rubber,
(B) shows a vulcanized rubber, in which sulfur and other vulcanizing agents are added to raw rubber and heated to form a strong bond between the rubber molecules 21 and 21 by the sulfur molecules 22, and a plastic flow over a wide temperature range. A change that decreases and increases elasticity, tensile strength, oil / chemical resistance, weather resistance, etc.

[0009] Polymerization means that two or more molecules of a certain compound (monomer) combine to form a compound (polymer) having a higher molecular weight. As shown in FIG. 2, it is a polymer obtained by mixing and polymerizing a mixture of different polymers and polymerizing the different monomers 23 and 24 in one molecule, and FIG. Coalescing,
2 (b) means an alternating polymer, FIG. 2 (c) means a block copolymer, and FIG. 2 (d) means a graft copolymer.

A segment is a virtual structural unit in a molecule of a polymer substance, and has an average size of a chain of 20 to 40 atoms.

Saturation refers to being fully filled, in which carbon atoms are bonded by a single bond (saturated bond),
If it contains no double or triple bonds, it is called a saturated compound.

The urethane resin paint is a paint in which a polyol resin is partially reacted with diisocyanate.
The reaction proceeds due to the moisture in the air to form a cured coating film. It has high water resistance, good gloss and chemical resistance, and has extremely high adhesion to metals and wood.

The glass run channel is provided with a lip opposed to both opening edges having a groove shape in cross section, and a urethane resin-based paint is applied to the sliding bottom surface and the lip surface portion of the glass. A surface treatment layer was formed by co-extrusion of a polyolefin-based thermoplastic elastomer having good properties together with the thermoplastic elastomer or the vulcanized EPDM compound.

[0014]

The glass run channel of an automobile is made of synthetic resin or rubber and has a groove shape as a whole for sliding a window glass. The glass run channel is slippery and abrasion resistant to glass and is deformed by bending. Not flexibility is needed. Here, when the surface treatment layer is formed by coating a urethane resin paint, the friction resistance against glass is poor. When the surface treatment layer is formed by co-extrusion of polyolefin, the product is bent. This causes a problem that deformation occurs.

[0015] The present invention provides a glass run which is superior in slipperiness and abrasion resistance to glass as compared with a glass run coated with a conventional urethane resin-based paint, and which is compared with a glass run channel having a conventional polyolefin coating layer. The goal is to provide a glass run channel with excellent flexibility.

[0016]

Means for Solving the Problems In FIG. 3 to FIG.
5 is an automobile, 6 is a sash, 3 is a glass run channel, 7 is glass, 1 is a thermoplastic elastomer or vulcanized E
A glass run substrate made of a PDM compound, and 2 is a surface treatment layer.

A styrene-based thermoplastic elastomer is produced by co-extrusion as a surface treatment material for glass run using a thermoplastic elastomer or a vulcanized EPDM compound as a base material 1.

As the styrene-based thermoplastic elastomer, there is a block copolymer having polystyrene as a hard segment and polybutadiene or polyisoprene or polyolefin as a soft segment. Types of the block copolymer include styrene, butadiene, styrene,
There are styrene / isoprene / styrene and styrene / ethylene / butylene / styrene or styrene / ethylene / propylene / styrene in which these are hydrogenated to make the rubber block saturated.

[0019]

EXAMPLES A comparison was made between styrene-based thermoplastic elastomers and olefin-based thermoplastic elastomers in terms of the required level of flexibility as a surface treatment material for glass run. As a styrene-based thermoplastic elastomer, a product name "ToughTech E2066" of Asahi Kasei Corporation was used, and as a olefin-based thermoplastic elastomer, a product name "Milastomer 6030B" of Mitsui Chemicals, Inc. was used. As a test method, two types of injection molded sheets having a thickness of 2 mm were prepared, and the material hardness was measured according to JIS A. JIS
100% elongation stress was measured according to K6301. A JIS No. 1 dumbbell-shaped sample was prepared from the sheet having a thickness of 2 mm, and a 100% elongation with respect to a 40 mm mark was released after holding at room temperature for 10 minutes, and the length between the marks after 10 minutes was measured. To calculate the permanent elongation (%). Using a co-extruded product (thickness: about 100 μm) with a thermoplastic elastomer 11 for a base material, as shown in FIG.
After being bent so that the side is on the inside and sandwiched by the clip 9 and kept at room temperature for 5 minutes, the appearance of the surface treatment layer side was visually observed, and Table 1 was obtained.
Was obtained.

[0020]

[Table 1]

[0021]

According to the characteristics of the styrene-based thermoplastic elastomer, the following advantages are obtained as compared with a conventional polyolefin or urethane-based paint which is a surface treatment material for glass run.

A) Compared with polyolefin, flexibility and permanent set performance are close to those of the vulcanized rubber region. Therefore, problems such as deformation and bending of the lip portion due to bending or the like are eliminated.

B) The extrusion process is simplified as compared with urethane-based paints. In addition, it is easy to control the thickness of the surface treatment layer.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of rubber vulcanization.

FIG. 2 is an explanatory diagram of a polymer.

FIG. 3 is a side view of the automobile.

FIG. 4 is an enlarged sectional view taken along the line IV-IV of FIG. 3;

FIG. 5 is an enlarged view of the glass run of FIG. 2;

FIG. 6 is an explanatory diagram of a test method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grass-lane base material 2 Surface treatment layer 3 Glass-run 5 Automobile 6 Sash 7 Glass 11 Thermoplastic elastomer for base materials 12 Surface treatment material 21 Rubber molecule 22 Sulfur molecule 23 Monomer 24 Monomer

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[Procedure amendment]

[Submission date] December 7, 1998 (1998.12.
7)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

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Claims (3)

[Claims] 1. A glass run channel obtained by co-extrusion molding a styrene-based thermoplastic elastomer as a surface treatment material 2 for a glass run whose base material is a thermoplastic elastomer for a base material or a vulcanized EPDM compound. 2. The glass run channel according to claim 1, wherein the styrene-based thermoplastic elastomer is a block copolymer having a hard segment having polystyrene and a soft segment having polybutadiene or polyisoprene or polyolefin. 3. A block copolymer comprising styrene / butadiene / styrene, styrene / isoprene / styrene, and styrene / ethylene / butylene / styrene or styrene / styrene / hydrogenated styrene / butylene / styrene.
The glass run channel according to claim 2, wherein the glass run channel is ethylene / propylene / styrene.