JP2005306274A - Composite for window frame contact surface of glass run - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite for a window frame contact surface of a glass run which has high tackiness against the window frame, has high followability to unevenness existing on the surface of a glass run mounting part of the window frame, and can make the window frame contact surface of the glass run highly friction resistant. <P>SOLUTION: The composite for the window frame contact surface of the glass run is made by blending a 100 pts mass of a polyolefin thermoplastic elastomer with 1 to 100 pts. mass of a block copolymer and/or a styrene block copolymer. The block copolymer is comprised of a vinyl aromatic compound and a conjugated diene compound, and the styrene block copolymer is a block copolymer obtained by hydrogenating the block copolymer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a composition for a window frame contact surface of a glass run.

  Generally, a glass run which is a long seal member is attached to a window frame of an automobile door. As illustrated in FIG. 2, the glass run 1 generally includes a channel portion 4 including a side wall portion 3 facing the base portion 2, and a seal lip portion 5 extending from the tip of the side wall portion 3 to the inside of the channel portion 4. The base portion 2 is attached to the inner peripheral portion of the window frame. When the glass run is opened and closed by sliding the window glass in the vertical direction, the movement of the window glass is guided by sliding the outer peripheral edge of the window glass to the base of the glass run. The window lip is fixed at the desired position by sandwiching both sides of the seal lip from the outside, and further, the gap between the window glass and the window frame is sealed to prevent rain, wind, sound, etc. from entering the vehicle. It is preventing.

  Conventionally, glass run materials were vulcanized rubber such as ethylene-propylene-diene copolymer rubber and soft synthetic resins such as soft vinyl chloride resin. Can be used, particularly polyolefin-based thermoplastic elastomers (for example, Patent Documents 1 to 3).

JP 2001-219746 A JP 2003-165340 A JP 2004-1771 A

When the window glass of an automobile is opened or closed, or when vibrations occur in the vehicle body, such as during travel, a displacement force acts on the glass run. Due to the above action, the fixed glass run is displaced from a predetermined position, and there is a problem that a wavy deformation occurs or the glass run comes out of the window frame in a severe case. In order to solve such problems, most conventional glass runs employ a method of increasing the slidability with respect to the window glass by reducing the frictional resistance at the contact surface with the window glass. However, this method is insufficient to completely solve the above problems.
Then, this invention makes it a subject to provide the composition for window frame contact surfaces of the glass run which can completely solve the problem of such a prior art.

The inventor of the present invention pays attention to the fact that the conventional glass run does not have sufficient frictional resistance against the window frame on the surface of the glass run, and eagerly increases the frictional resistance while maintaining various functions required for the glass run. As a result of investigation, it was found that the above-mentioned problems can be solved by using a composition in which a styrene block copolymer is blended with a polyolefin-based thermoplastic elastomer. It came to be completed.
That is, the present invention relates to a block copolymer composed of a vinyl aromatic compound and a conjugated diene compound and / or a block copolymer obtained by hydrogenating this to 100 parts by mass of a polyolefin-based thermoplastic elastomer. A composition for a window frame contact surface of a glass run comprising 1 to 100 parts by mass of a system block copolymer.

The composition for the window frame contact surface of the glass run according to the present invention is highly adhesive to the window frame, and for the unevenness and the shape of the window frame present on the surface of the glass run attachment part of the window frame There is high followability, and the window frame contact surface of the glass run can be made high in friction resistance.
Therefore, the window frame contact surface composition according to the present invention is extremely excellent in terms of glass run retention, such as glass run slippage, peeling, omission, etc. caused by opening and closing of the window glass and vibration during travel. Thus, the problems of the conventional glass run can be solved brilliantly, and the recyclability is also good.

As described above, the window frame contact surface composition of the present invention is a composition containing two essential components, a polyolefin-based thermoplastic elastomer and a styrene-based block copolymer. Hereinafter, the present invention will be described in detail.
The polyolefin-based thermoplastic elastomer used in the present invention is mainly composed of an olefin-based resin and an olefin-based rubber. Examples of the olefin-based resin include polyethylene, copolymers of ethylene and other olefin monomers, polypropylene, propylene, and Examples thereof include copolymers with other olefin monomers, polybutene, copolymers of 1-butene with other olefin monomers, and the like. Examples of the olefin rubber include ethylene-propylene-nonconjugated diene rubber (EPDM), styrene-butadiene rubber (SBR), nitrile butadiene rubber (NBR), natural rubber (NR), butyl rubber (IIR), and chlorosulfonated polyethylene. (CSM). The olefin-based rubber can be present in the polyolefin-based thermoplastic elastomer in any crosslinked state of uncrosslinked, partially crosslinked, and totally crosslinked.
As an example of the above-mentioned polyolefin-based thermoplastic elastomer, specifically, the main composition consists of a polypropylene-based resin and EPDM, and sulfur, an organic peroxide, a phenol resin, or a hydrosilylation cross-linking agent is added to these to dynamically A composition obtained by crosslinking EPDM with a hydrogenated block copolymer obtained by hydrogenating a copolymer comprising a vinyl aromatic polymer block and a conjugated diene polymer block to this composition, low density polyethylene (LDPE) , Linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer Compositions in which ethylene resin such as coalescence (EEA) and various polypropylene resins are kneaded; vinyl aromatic polymer block and conjugated diene polymerization Composition and a hydrogenated block copolymer obtained by hydrogenating a copolymer comprising blocks, various polypropylene resin as a main component is exemplified.
In the present invention, the polyolefin thermoplastic elastomer preferably has a blending mass ratio of the olefin resin and the olefin rubber in the range of 8/2 to 2/8.

The styrene block copolymer used in the present invention has an effect of promoting the adhesiveness of the resulting composition by being blended with the polyolefin thermoplastic elastomer. The styrenic block copolymer is a block copolymer composed of a vinyl aromatic compound and a conjugated diene compound, and / or a block copolymer obtained by hydrogenation thereof, for example, AB type, A -BA type block copolymer is mentioned. Here, A can be a polymer block mainly composed of a vinyl aromatic compound, and B can be a block mainly composed of a conjugated diene compound, both of which are hydrogenated.
The polymer block A mainly composed of a vinyl aromatic compound is a copolymer of only a vinyl aromatic compound or preferably 70% by mass or more of a vinyl aromatic compound and a (hydrogenated) conjugated diene compound. It is a block.
Block B mainly composed of a conjugated diene compound consists of a conjugated diene compound (hydrogenated) alone, or preferably 70% by weight or more of a conjugated diene compound (hydrogenated) and a vinyl aromatic compound. It is a coalesced block.
The molecular structure of the styrenic block copolymer may be linear, branched, radial, or any combination thereof.
Specific examples of the styrenic block copolymer include styrene-butadiene rubber (SBR), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), and styrene-ethylene. -Butadiene-butylene-styrene block copolymer (SBBS), butadiene-styrene-methyl methacrylate copolymer (MBS), styrene-ethylene-ethylene-propylene-styrene copolymer (SEEPS), hydrogenated SBS (SEBS), Examples include hydrogenated SIS (SEPS). Of these, SEBS is particularly preferred.
In this invention, the compounding quantity of the said styrene-type block copolymer shall be 1-100 mass parts with respect to 100 mass parts of polyolefin-type thermoplastic elastomers, Preferably, it is 3-50 mass parts. When the blending amount of the styrenic block copolymer is less than 1 part by mass, the friction coefficient is low, and when it exceeds 100 parts by mass, the heat resistance may be lowered.

  The styrenic block copolymer used in the present invention preferably has a melt flow rate (MFR) of 3 to 100 g / min (according to ASTM D-1238, 200 ° C., 5 kgf load), more preferably 5 to 20 g. / Min. A melt flow rate in the range of 3 to 100 g / min is preferable in terms of the coefficient of friction, the appearance of the molded product, and the workability.

  The styrenic block copolymer used in the present invention preferably has a spring hardness (Hs) of 30 to 90 ° (based on JIS-A). When the hardness is in the range of 30 to 90 °, it is preferable in terms of the coefficient of friction, the appearance of the molded product, and the workability.

  The styrenic block copolymer used in the present invention preferably has a tensile strength (Ts) of 2 to 30 MPa (based on JIS-K6251). When the tensile strength (Ts) is in the range of 2 to 30 MPa, it is preferable in terms of the coefficient of friction, the appearance of the molded product, and the workability.

In addition to the above essential components, the composition for window frame contact surface of the present invention, in addition to the above-mentioned essential components, does not impair the effects of the present invention, and a heat stabilizer. , Antistatic agents, colorants, flame retardants, antibacterial agents, etc. can be added to the present invention by mixing and kneading the above components using a kneading apparatus such as a Banbury mixer, an extruder, a kneader, or a continuous mixer. The window frame contact surface composition is obtained.
The window frame contact surface composition of the present invention preferably has a spring hardness (Hs) of 50 to 80 ° (based on JIS-A).

  Using the composition for a window frame contact surface according to the present invention, as illustrated in FIG. The glass run 1 of the present invention can be obtained by forming the entire base portion 2. In FIG. 1, 2 is a base portion, 3 is a side wall portion, 4 is a channel portion, and 5 is a seal lip portion. In order to maximize the effect of the present invention, it is desirable to provide at least a coating layer comprising the window frame contact surface composition of the present invention on all the window frame contact surfaces of the glass run. The thickness of the coating layer is preferably 0.02 to 4.00 mm. The method for forming the coating layer on the glass run body is not particularly limited, and a normal molding method such as an extrusion molding method, a blow molding method, an injection molding method, or a press molding method may be used.

(Examples 1-2)
A kneaded raw material in which polypropylene (PP), ethylene-propylene-nonconjugated diene rubber (EPDM), paraffinic oil, and hydrosilylation cross-linking agent were blended according to the blending formulation shown in Table 1 (in Table 1, numbers indicate parts by mass) , Put into the hopper of high-speed twin-screw extruder PCM30 (product name, manufactured by Ikegai Co., Ltd.), inject a platinum-based hydrosilylation catalyst from the cylinder, perform dynamic crosslinking at 190 ° C, and polyolefin-based thermoplastic An elastomer was produced.
For 100 parts by mass of each polyolefin-based thermoplastic elastomer produced, the melt flow rate is 10 g / min (according to ASTM D-1238, 200 ° C, 5 kgf load), and the tensile strength (Ts) is 11.8 MPa (according to JIS-K6251). , Tuftec H1052 (SEBS, manufactured by Asahi Kasei Co., Ltd., trade name) having a spring hardness (Hs) of 67 ° (compliant with JIS-A) was blended according to the blending recipe shown in Table 1 and kneaded with a twin screw extruder. A glass run window frame contact surface composition was prepared. About this produced composition, spring hardness (Hs) (JIS-A conformity) was measured. The results are shown in Table 1.

(Production of glass run)
As shown in FIG. 1, the window frame contact surface composition of Examples 1 and 2 is allowed to flow on the surface of the base portion 2 on which the coating layer 6 is formed, and the glass run main body is configured in the other portions. Two single-screw extruders were connected to allow the composition to flow. For the glass run body, the polyolefin thermoplastic elastomer produced in Example 1 was used, and the die temperature was 180 ° C., the temperature of the two single-screw extruders and the neck for connecting the die were adjusted to 170 to 200 ° C. In all examples, the coating layer was formed on the window frame contact surface of the base so that the width of the molded product, the total discharge amount, and the thickness were the same. The thickness of the coating layer was 0.1 mm.

(Evaluation of coating layer)
About the coating layer formed in each said glass run, the static friction coefficient between the surface of a coating layer and a motor vehicle coating board was measured according to the method prescribed | regulated to JIS K7125 using the motor vehicle coating board as a to-be-adhered body. The results are shown in Table 1.

It is sectional drawing which shows an example of the glass run of this invention. It is sectional drawing which shows an example of the conventional glass run.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Glass run 2 ... Base part 3 ... Side wall part 4 ... Channel part 5 ... Seal lip part 6 ... Covering layer

Claims (4)

  A block copolymer composed of a vinyl aromatic compound and a conjugated diene compound and / or a styrene block copolymer which is a block copolymer obtained by hydrogenation to 100 parts by mass of a polyolefin-based thermoplastic elastomer. A composition for a window frame contact surface of a glass run, comprising 1 to 100 parts by mass.   The styrene block copolymer has a melt flow rate (MFR) of 3 to 100 g / min (according to ASTM D-1238, 200 ° C., 5 kgf load), tensile strength (Ts) of 2 to 30 MPa (according to JIS-K6251), The window frame contact surface composition according to claim 1, wherein the spring hardness (Hs) is 30 to 90 ° (JIS-A compliant).   The window frame contact surface composition according to claim 1 or 2, wherein the spring hardness (Hs) is 50 to 80 ° (based on JIS-A). The glass run in which the coating layer which consists of a composition for window frame contact surfaces of any one of Claims 1-3 is formed in the surface which contacts a window frame at least of a glass run.

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