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Flexible resin boot and method for producing it

Inactive Publication Date: 2002-03-21
TOYO TIRE & RUBBER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The flexible resin boot of the invention has good heat resistance, good bending resistance and good mechanical strength. In addition, since the resin to form the boot is combined with oil such as mineral oil or vegetable oil, the boot ensures improved sealability and durability. In particular, the noise-preventing effect of the boot is good in early stages, and it lasts long.
[0065] In case where the mixture having been prepared by mixing and stirring thermoplastic polyester elastomer pellets, the liquid additive and the solid additives is kneaded and extruded out through a double-screw extruder, obtained is a boot-forming material in which the liquid additive and the solid additives are uniformly dispersed in the thermoplastic polyester elastomer. The material can be formed into flexible boots having the advantage of long-lasting noise prevention.

Problems solved by technology

It is therefore believed that the oily film thus tightly adhering to the surface of the boot does not easily peel off, being different from the bled powdery solid of the fatty acid amide in the related art technology as above.
In particular, the noise-preventing effect of the boot is good in early stages, and it lasts long.

Method used

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  • Flexible resin boot and method for producing it
  • Flexible resin boot and method for producing it
  • Flexible resin boot and method for producing it

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 5

[0073] To a base material of a thermoplastic polyester elastomer, PELPRENE P46D (from Toyo Boseki--this comprises hard segments of a polymer of terephthalic acid and 1,4-butanediol and soft segments of PTMG, and has a PTMG comonomer content of from 40 to 50% by weight), added was mineral paraffinic process oil, BJ Oil(from Kyodo Yushi) to prepare a composition for boots. Using an injection molding machine, the composition was molded into flexible resin boots. The blend ratio of mineral oil was varied within a range of from 0.5 to 5.0 parts by weight to 100 parts by weight of the thermoplastic polyester elastomer, as in Table 1 below.

[0074] BJ Oil used herein was analyzed according to a method of structural group analysis (n-d-M method), and it had a paraffin content of 68%, a naphthene content of 25% and an aromatic content of 7%. Through GPC, the molecular weight of BJ Oil was measured. Though varying depending on its lots, the oil had a number-average molecular weight of from 660 ...

examples 6 to 10

[0086] The same thermoplastic polyester elastomer as in Examples 1 to 5 was used as the base material. To this was added mineral paraffinic process oil having a number-average molecular weight of 200 (Example 6), 500 (Example 7), 750 (Example 8), 1000 (Example 9), or 2000 (Example 10), as in Table 2 below. The resulting mixture was molded into flexible resin boots in the same manner as in Example 1. In these Examples 6 to 10, the blend ratio of the paraffinic process oil was 1.5 parts by weight to 100 parts by weight of the thermoplastic polyester elastomer.

examples 11 to 15

[0090] The same thermoplastic polyester elastomer as in Examples 1 to 5 was used as the base material. To this was added mineral paraffinic process oil having a weight-average molecular weight of 200 (Example 11), 500 (Example 12), 950 (Example 13), 1400 (Example 14), or 2000 (Example 15), as in Table 3 below. Using an injection molding machine, the resulting mixture was molded into flexible resin boots. In these Examples 11 to 15, the blend ratio of the paraffinic process oil was 1.5 parts by weight to 100 parts by weight of the thermoplastic polyester elastomer.

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Abstract

Provided is a flexible resin boot of which the noise-preventing effect lasts long and which ensures improved sealability and durability. The boot is formed from a base resin of a thermoplastic elastomer resin, and has a large port and a small port that are connected with each other via a bellows therebetween. For this, mineral oil or vegetable oil is added to the thermoplastic elastomer resin. Preferably, the thermoplastic elastomer resin is a thermoplastic polyester elastomer, and the mineral oil is process oil having an aromatic content of at most 13%. The boot is used for covering the constant velocity joint in an automobile.

Description

[0001] The present invention relates to a bellows-shaped flexible resin boot to be used, for example, in constant velocity joints for automobiles, and to a method for producing it.[0002] A flexible resin boot of the type has a large port at one end to be fitted to the housing of a constant velocity joint of an automobile, and a small port at the other to be fitted to the axle thereof, and has a tapered bellows between the two ports. Applied to a constant velocity joint, it prevents grease from leaking out of the joint and prevents dust from entering the joint.[0003] For forming such flexible boots, heretofore, chloroprene rubber has been used generally. However, flexible boots formed from chloroprene rubber are much expanded and deformed by the rotational centrifugal force, especially when they are rotated at high speed. In case where they are kept expanded and deformed under the condition for a long period of time, or where they undergo repeated expansion and contraction, they will...

Claims

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Application Information

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IPC IPC(8): F16D3/84F16J3/04
CPCB29L2031/703C08L67/025C08L91/00F16D3/845Y10T428/1352F16J3/041F16D2200/006Y10T428/139C08L2666/02
Inventor SAITO, KATSUSHITORIUMI, MAYUKIUENO, HITOSHI
Owner TOYO TIRE & RUBBER CO LTD
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