Low arene content thermoplastic elastomer/oil/polyolefin...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 53/02 (2006.01) C08K 5/01 (2006.01) C08K 5/134 (2006.01) C08K 5/372 (2006.01)

Patent

CA 2258624

The present invention relates to a thermoplastic elastomer composition comprising: a base composition comprising: (i) 65 to 90 weight percent of a block copolymer having at least two polymerised monovinyl aromatic endblocks having a molecular weight of less than 20000 and a midblock of hydrogenated polymerised diene, wherein said endblocks constitute less than 20 weight percent of said block copolymer, (ii) 5 to 25 weight percent of a paraffinic oil, and (iii) 5 to 15 weight percent of a crystalline polyolefin. The present invention further relates to a process for preparing a thermoplastic elastomer composition and to articles containing the thermoplastic elastomer composition.

Composition élastomère thermoplastique composée d'une composition de base formée (i) à raison de 65 à 90 pour-cent en poids d'un copolymère séquencé possédant au moins deux séquences terminales de monovinyle aromatique polymérisé présentant un poids moléculaire inférieur à 20 000, et une séquence intermédiaire de diène hydrogéné polymérisé, les séquences terminales représentant moins de 20 pour-cent en poids du copolymère séquencé, (ii) à raison de 5 à 25 pour-cent du poids d'une huile paraffinique et (iii) à raison de 5 à 25 pour-cent du poids d'une polyoléfine cristalline. L'invention concerne en outre un procédé pour préparer une composition élastomère thermoplastique et des articles contenant cette composition.

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