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In order to impart flexibility to the rubber, a softener such as oil is generally added, but if the softener is added, bleeding is likely to occur and the appearance of the molded product will be impaired
Method used
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[0160] Hereinafter, the present invention will be further described through examples and comparative examples, but the present invention is not limited in any way by the following examples. The materials and experimental methods used in the examples and comparative examples are as follows.
[0166] SEBS: KRATON MD6933ES (trade name, produced by KRATON POLYMER Co., Ltd.), a styrene-ethylen...
Embodiment 1～10 and comparative example 1～8
[0204] For the coating layer (3), the composition having the composition (parts by weight) shown in Table 1 was used, and the composition having the composition (parts by weight) shown in Table 2 was used for the hollow sealing portion (11) to produce the composition shown in Fig. 6 Extrusion molded product showing cross section. For the core (2), EBP9840N (produced by RIKEN TECHNOS, polypropylene mixed with 40% by weight of talcpowder, measured according to JIS K7161, the tensile elongation at break is 110%, measured according to ASTM D790 at 23°C The bending elastic modulus of 3500MPa).
[0205]It is manufactured according to the method shown in FIG. 8. That is, first, the resin constituting the core (2) is supplied to the first extruder (EX1) and passed through the inside of the first die (K1) to form the core. After passing the formed core having a substantially U-shaped cross-section through the cooling groove (C1), a punchingmachine (P1) is used to form a cutout. The extru...
Embodiment 11～13 and comparative example 9～11
[0217] Except for using the composition shown in Table 3 as the resin constituting the core (2) in Example 1, a molded product was produced in the same manner as in Example 1, and evaluation experiments of flange retention and R followability were performed. The results are shown in Table 3.
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Abstract
An extrusion molded article for automobiles, having a body portion (1) and a hollow sealing portion (11), where the body portion (1) comprises a core (2) made of a resin having a U-shaped cross-section extending in a longitudinal direction and a covering layer (3) surrounding and covering the core partly or entirely, and the hollow sealing portion (11) is bonded integrally with an outer surface (4) of the body portion, characterized in that the covering layer (3) is made of a thermoplasticelastomer composition having a tensile elongation at break of at least 350% , as determined according to JIS K6251, and a change in 100% modulus of at most 40%, wherein the change in 100% modulus = [(100% modulus at 23 DEG C - 100 % modulus at 80 DEG C) / 100 % modulus at 23 DEG C ] x 100, and the 100 % modulus is a stress at 100% elongation, as determined according to JIS K6251, and the hollow sealing portion (11) is made of a thermoplasticelastomer composition having a tensile elongation at break of at least 250%, as determined according to JIS K6251, and a compression set of 35% or less, as determined at 25% compression, 70 DEG C, 200 hours.
Description
Technical field [0001] The present invention relates to extruded products such as weather strips or caulking strips used in various openings such as automobile doors and trunks. Background technique [0002] The weather strip or caulking strip of a car is a long, sealed interior decoration that is installed on the door or the outer frame of the car to prevent rain or external air and block noise. As shown in Figure 1, the interior decoration has a main body part (1) and a hollow sealing part (11) integrated with the main body part (1). The main body part (1) has a core with a substantially U-shaped cross section. (2) and the surrounding coating (3). For installation, the flange part (12) of the vehicle body panel (13) is embedded in the gap (A) of the main body part (1), and the hollow sealing part (11) is connected to the door and the like to play a buffering role. [0003] In order to improve the installation and retention of the vehicle body panel, in the past, such interior d...
Claims
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