Method for producing flame-retardant thermoplastic elastomer composition

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United States of America Patent

PATENT NO 9518175
APP PUB NO 20150183972A1
SERIAL NO

14578345

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Abstract

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A flame-retardant thermoplastic elastomer composition is provided to produce a molded article possessing mechanical properties, flame retardancy and softness inherently possessed by a molted article obtained from a thermoplastic elastomer composition containing a mineral oil-based softening agent and a flame retardant and fails to stain a mold after injection molding. A production method includes step (1) obtaining a thermoplastic elastomer composition by dynamically crosslinking a polymer mixture (A) containing an ethylene-α-olefin-based copolymer rubber (A1) and a propylene-based polymer (A2) in the presence of a mineral oil-based softening agent (C) and a crosslinking agent (D), and step (2) kneading the thermoplastic elastomer composition, a halogen-free flame retardant (E), zinc oxide (F), and a thermoplastic resin with a polar group (G). The amounts of the components satisfy condition (p) when starting the dynamic crosslinking in step (1) and satisfy condition (q) when starting the kneading in step (2), respectively.

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Patent Owner(s)

  • SUMITOMO CHEMICAL COMPANY, LIMITED

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurokawa, Ryosuke Chiba, JP 31 77
Natsuyama, Nobuhiro Chiba, JP 18 55

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