Thermoplastic elastomer composition, formed article and sealing material having low hardness

A thermoplastic elastomer and sealing material technology, applied in the field where there is no leakage of mineral oil-based softeners, can solve the problems of high recyclability, reduced rubber elasticity, and insufficient softness that cannot meet the requirements, and achieve resource saving and molding Excellent processability and excellent compression set

Inactive Publication Date: 2007-04-11
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A thermoplastic elastomer composition is disclosed in Patent Document 1, etc., but the composition of this document has insufficient flexibility, and if a softener such as mineral oil is added, the softener will ooze out of the molded product, resulting in rubber elasticity. Lowering and other issues
[0003] Vulcanized rubber, vulcanized foamed rubber, and foamed polyurethane meet the requirements in terms of properties such as flexibility and airtightness, but in recent years, they cannot meet the high demand for recycling from the viewpoint of resources.

Method used

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  • Thermoplastic elastomer composition, formed article and sealing material having low hardness
  • Thermoplastic elastomer composition, formed article and sealing material having low hardness
  • Thermoplastic elastomer composition, formed article and sealing material having low hardness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0196] 1. Preparation of thermoplastic elastomer composition

[0197] According to the ratio shown in Table 1, an oil extender containing the following ethylene-α-olefin copolymer and a mineral oil softener (hydrogenated paraffin mineral oil manufactured by Idemitsu Kosan Co., Ltd., trade name "Diana proses oil PW380") was prepared. Rubber (I). Then, according to the mixing ratio in Table 2, the oil-extended rubber (I), the following polyolefin-based resin, the above-mentioned mineral oil-based softener, hydrogenated diene-based polymer, cross-linking agent and cross-linking auxiliary agent were combined. Various additives are mixed to obtain a raw material composition. This raw material composition was put into a pressurized kneader (capacity 10 L, manufactured by Moriyama Co., Ltd.) heated to 150° C. in advance, and kneaded at 40 rpm (shear rate 200 / second) for 15 minutes until the polyolefin resin melted, and each The ingredients are evenly dispersed. Then, the kneaded m...

Embodiment 2-3 and comparative example 1-2

[0246] Except having used each raw material component in the mixing ratio of Table 2, it carried out similarly to Example 1, obtained each thermoplastic elastomer composition, and evaluated it. The results are recorded in Table 2 together.

Embodiment 4-5、 comparative example 4-5

[0253] 1. Preparation of thermoplastic elastomer composition

[0254] Mix the following oil-extended rubber [X], polyolefin-based resin, mineral oil-based softener, hydrogenated diene-based polymer, and additives (excluding cross-linking agent and cross-linking auxiliary agent) according to the mixing ratio in Table 3, Granules were produced in the same manner as in Example 1.

[0255] Then, according to the ratio shown in Table 3, the above-mentioned granules, crosslinking agent and crosslinking auxiliary agent were added in the Henschel mixer, mixed for 30 seconds, and then carried out in the same way as in Example 1 with a twin-screw extruder. Dynamic heat treatment and extrusion to obtain three (A, B, C) granular thermoplastic elastomer compositions.

[0256] (1) Oil-extended rubber [X]

[0257] Oil-extended copolymer rubber 1: 50% by mass ethylene / propylene / 5-ethylene-2-norbornene terpolymer (ethylene content is 66mol%, 5-ethylene-2-norbornene content is 4.5mol %, intr...

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Abstract

A first thermoplastic elastomer composition which comprises 100 parts by mass of the sum of 5 to 60 mass % of [A] an ethylene.alpha-olefin based copolymer having a limiting viscosity of 3.5 dl / g or more as measured in a decalin solvent at 135 DEG C, 1 to 20 mass % of [B] a polyolefin based resin and 30 to 94 mass % of [C] a mineral oil based softening agent (provided that the sum of [A], [B] and [C] is 100 mass %), and 0.1 to 50 parts by mass of a hydrogenated diene based polymer, wherein at least the above [A] an ethylene.alpha-olefin based copolymer and [B] a polyolefin based resin have been subjected to a dynamic heat treatment in the presence of a cross-linking agent; or a second thermoplastic elastomer composition obtained by substituting [A] component of the first thermoplastic elastomer composition with an oil-extended rubber consisting of 20 to 80 mass % of [A1] an ethylene.alpha-olefin based copolymer having a limiting viscosity of 3.5 dl / g or more as measured in a decalin solvent at 135 DEG C and 20 to 80 mass % of [C1] a mineral oil based softening agent (provided that the sum of [A1] and [C1] is 100 mass %). The above thermoplastic elastomer composition is excellent in processability, has a low hardness, is free from the bleeding of a softening agent such as a mineral oil, has softness, is excellent in rubbery elastic properties (rebound, compression set) and further can be recycled.

Description

technical field [0001] The present invention relates to a thermoplastic elastomer composition, a molded article using the composition, and a low-hardness sealing material. A thermoplastic elastomer composition and a molded article excellent in permanent deformation) and free from exudation of a mineral oil-based softener, and further relates to a low-hardness sealing material made of a thermoplastic elastomer composition. Background technique [0002] Sealants used in sealing materials for office machines, automobiles, building materials, etc. are very flexible, and attempts have been made to improve vulcanized rubber or vulcanized foamed rubber, foamed urethane, or thermoplastic elastomer compositions that can be used as flexible materials (Refer to Patent Documents 1-3). A thermoplastic elastomer composition is disclosed in Patent Document 1, etc., but the composition of this document has insufficient flexibility, and if a softener such as mineral oil is added, the soften...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08L15/00C08J3/24
Inventor 鼎健太郎前田稔堤正美长谷川研二
Owner JSR CORPORATIOON
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