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Title:
THERMOPLASTIC ELASTOMER COMPOSITION AND MOLDED PRODUCT THEREOF
Document Type and Number:
Japanese Patent JP2010254809
Kind Code:
A
Abstract:

To provide a thermoplastic elastomer composition which extremely reduces the bleeding of a softening agent for nonaromatic rubbers in spite of ultra-low hardness and has a small compression set, and a molded product thereof.

The thermoplastic elastomer composition includes (A) 100 pts.mass hydrogenated block copolymer which is obtained by hydrogenating a block copolymer comprising at least one polymer block mainly having a vinyl aromatic compound and at least one polymer block mainly having a conjugated diene compound and has a weight average molecular weight of 300,000-450,000, (B) 180-270 pts.mass softening agent for nonaromatic rubbers having a kinematic viscosity at 40°C of 350-400 mm2/sec and a molecular weight distribution (Mw/Mn) measured by the gel permeation chromatography of not greater than 1.3, and (C) 3.0-10 pts.mass polypropylene, and has a Shore A hardness of 4-12°.


Inventors:
SANO RYOSUKE
Application Number:
JP2009106568A
Publication Date:
November 11, 2010
Filing Date:
April 24, 2009
Export Citation:
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Assignee:
BRIDGESTONE CORP
International Classes:
C08L53/02; C08L23/10
Domestic Patent References:
JP2009065476A2009-03-26
JP2008188802A2008-08-21
Attorney, Agent or Firm:
Tamotsu Otani