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Thermoplastic elastomer composition and molded article thereof

A technology of thermoplastic elastomer and composition, which is applied in the field of dynamic cross-linked thermoplastic elastomer composition and its molded products, which can solve the problems of poor molding appearance, insufficient sliding property, bad appearance, etc., and achieve excellent durable sliding property , Injection molding hot melt excellent effect

Inactive Publication Date: 2007-02-28
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, an olefin-based thermoplastic elastomer composition obtained by adding polyorganosiloxane and aliphatic amide to an olefin-based thermoplastic elastomer is disclosed as a thermoplastic elastomer composition (see, for example, Patent Document 1), and also discloses An olefin-based thermoplastic elastomer composition in which an acrylic-modified polyorganosiloxane, a higher fatty acid, and / or a higher fatty acid amide is used in combination with an olefin-based thermoplastic elastomer (see, for example, Patent Document 2), but none of them have sufficient sliding properties, and the fatty amide Has a problem of bad appearance due to blooming
[0004] In addition, it is also disclosed that the addition viscosity of 10 to less than 10 is used in combination with an olefinic thermoplastic elastomer. 6 cSt polyorganosiloxane, viscosity 10 6 ~10 8 The olefin-based thermoplastic elastomer composition obtained by cSt polyorganosiloxane (see, for example, Patent Document 3) has good sliding properties due to the addition of a large amount of polyorganosiloxane, but the polyorganosiloxane bleeds out during injection molding. to the mold surface, so there is a problem that the formed appearance deteriorates

Method used

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  • Thermoplastic elastomer composition and molded article thereof
  • Thermoplastic elastomer composition and molded article thereof
  • Thermoplastic elastomer composition and molded article thereof

Examples

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preparation example Construction

[0125] Process for the preparation of thermoplastic elastomer compositions

[0126] As described above, the thermoplastic elastomer composition of the present invention can be obtained by adding at least (A1) or (X) component and (B) component, usually adding (A1) to (E1) component or (X) to (E1) component , supplied to a continuous or closed melt kneader, and obtained by dynamic heat treatment in the presence of a crosslinking agent.

[0127] Here, the above-mentioned "dynamic heat treatment" means that both application of shearing force and heating are performed. This dynamic heat treatment can be performed by, for example, a melting and kneading device, and the treatment by the melting and kneading device may be continuous or batch.

[0128] Among them, examples of devices capable of melt-kneading include open mixing rolls, non-open Banbury kneaders, single-screw extruders, twin-screw extruders, continuous kneaders, pressurized kneaders, etc. machines and other devices. ...

Embodiment 1～7

[0174] Examples 1-7, Comparative Examples 1-4 (preparation of thermoplastic elastomer composition)

[0175] The following EAO-based copolymer (A) or oil-extended rubber (X), olefin-based thermoplastic resin (B), unmodified polyorganosiloxane (C), vinyl group-containing polyorganosiloxane ( D), mineral oil-based softener (E) and other additives are put into a pressurized kneader (capacity 10 liters, manufactured by Moriyama Co., Ltd.) heated to 150 ° C in advance according to the compounding ratio shown in Table 1. Speed ​​200 / sec) kneading for 15 minutes until the olefin resin is melted and the ingredients are uniformly dispersed.

[0176] The obtained molten composition was made into pellets using Fi-Da-Lu-Da (manufactured by Moriyama Corporation).

[0177]Add the following crosslinking agent in the ratio shown in Table 1 to the obtained granules, mix it with a Henschel mixer for 30 seconds, and then use a twin-screw extruder (completely intermeshing screw in the same direct...

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Abstract

A thermoplastic elastomer composition which comprises a mixture of an ethylene / alpha-olefin copolymer (A1) or an oil-extended rubber (X) consisting of an ethylene / alpha-olefin copolymer (A2) and a mineral oil softener (E2) with a thermoplastic alpha-olefin resin (B) comprising a crystalline thermoplastic alpha-olefin resin (B1) and / or a noncrystalline thermoplastic alpha-olefin resin (B2) and, incorporated in the mixture, an unmodified organopolysiloxane (C), a vinylated organopolysiloxane (D), and a mineral oil softener (E1); and a molded article obtained by molding the composition. The thermoplastic elastomer composition imparts initial sliding properties due to the organopolysiloxane, which has a low viscosity. Since the thermoplastic elastomer composition contains the vinylated organopolysiloxane, which has been crosslinked, it has long-lasting antiwear properties (long-term sliding properties). It gives a molding having an excellent appearance.

Description

technical field [0001] The present invention relates to a dynamically cross-linked thermoplastic elastomer composition and a molded article thereof, which are added with low-viscosity silicone oil and have good sliding properties, abrasion properties, and molded appearance of vinyl-group-containing silicone rubber. Background technique [0002] Conventionally, thermoplastic elastomer compositions have been widely used in addition to rubber materials as polymer materials excellent in flexibility and rubber elasticity. [0003] Among them, an olefin-based thermoplastic elastomer composition obtained by adding polyorganosiloxane and aliphatic amide to an olefin-based thermoplastic elastomer is disclosed (see, for example, Patent Document 1), and also discloses An olefin-based thermoplastic elastomer composition in which an acrylic-modified polyorganosiloxane, a higher fatty acid, and / or a higher fatty acid amide is used in combination with an olefin-based thermoplastic elastome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/02C08J3/24C08L23/08C08L23/16C08L83/04
CPCC08L23/16C08L83/04C08L23/0815C08L2205/02C08L2666/06C08L83/00C08L23/02C08L23/08
Inventor 鼎健太郎中西英雄小林雅人神品顺二
Owner JSR CORPORATIOON
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