Very soft, non-sticky and transparent styrenic thermoplastic elastomer composition

US11066503B2 · kind B2 · utility

Assignee

• INEOS STYROLUTION GROUP GMBH · DE

Inventors

• Michiel VERSWYVEL · Mechelen, BE
• Norbert Niessner · Friedelsheim, DE
• Eike Jahnke · Frankfurt, DE
• Daniel Wagner · Bad Dürkheim, DE
• Konrad Knoll · Mannheim, DE

Key dates

• Filing date: Mar 12, 2018
• Grant date: Jul 20, 2021
• Expiry date: Aug 16, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L53/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic elastomer compositions can be used for medical skin contact applications, comprising: a) 90.9 to 69.0 wt.-% star-shaped block copolymer A with 4 arms of the general structure [S1—(S/B)k—(S/B)I—(S/B)m—S2]n—X, where S1 and S2 are vinylaro-matic hard polymer and S/B are soft random vinylaromatic/diene copolymer blocks; X is a coupling center; and b) 9.1 to 31.0 wt.-% of a plasticizer B: b1) a mixture of mineral oil B1 and cyclohexane 1,2-dicarboxylic acid C8 to C10 dialkyl ester B2; or b2) a mixture of mineral oil B1 and vegetable oil B3.