Title:
THERMOPLASTIC ELASTOMER COMPOSITION, FORMED ARTICLE AND SEALING MATERIAL HAVING LOW HARDNESS
Document Type and Number:
WIPO Patent Application WO/2005/075555
Kind Code:
A1
Abstract:
A first thermoplastic elastomer composition which comprises 100 parts by mass of the sum of 5 to 60 mass % of [A] an ethylene·&agr -olefin based copolymer having a limiting viscosity of 3.5 dl/g or more as measured in a decalin solvent at 135°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·&agr -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·&agr -olefin based copolymer having a limiting viscosity of 3.5 dl/g or more as measured in a decalin solvent at 135°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.
Inventors:
KANAE KENTAROU (JP)
MAEDA MINORU (JP)
TSUTSUMI MASAMI (JP)
HASEGAWA KENJI (JP)
MAEDA MINORU (JP)
TSUTSUMI MASAMI (JP)
HASEGAWA KENJI (JP)
Application Number:
PCT/JP2005/001989
Publication Date:
August 18, 2005
Filing Date:
February 03, 2005
Export Citation:
Assignee:
JSR CORP (JP)
KANAE KENTAROU (JP)
MAEDA MINORU (JP)
TSUTSUMI MASAMI (JP)
HASEGAWA KENJI (JP)
KANAE KENTAROU (JP)
MAEDA MINORU (JP)
TSUTSUMI MASAMI (JP)
HASEGAWA KENJI (JP)
International Classes:
C08J3/24; C08L15/00; C08L23/00; C08L23/02; C08L23/08; (IPC1-7): C08L23/00; C08J3/24; C08L15/00
Domestic Patent References:
| WO2003025055A1 | 2003-03-27 |
Foreign References:
| JP2001081199A | 2001-03-27 | |||
| JPH08291239A | 1996-11-05 | |||
| JP2003183450A | 2003-07-03 | |||
| JP2002327098A | 2002-11-15 | |||
| JP2001200118A | 2001-07-24 | |||
| JPH0425520A | 1992-01-29 |
Other References:
See also references of EP 1712591A4
Attorney, Agent or Firm:
Watanabe, Kazuhira (No.8 Kikuboshi Tower Building 20-18,
Asakusabashi 3-chom, Taito-ku Tokyo 53, JP)
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