Antistatic expandable styrene polymers in bead form

US5110835A · kind A · utility

Assignee

• BASF SE

Inventors

• Manfred Walter · Nuremberg, DE
• Karl-Heinz Wassmer · Mutterstadt, DE
• Maria Lorenz · Ludwigshafen, DE

Key dates

• Filing date: Aug 5, 1991
• Grant date: May 5, 1992
• Expiry date: Aug 5, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An antistatic expandable styrene polymer in bead form, containing PA0 a) a styrene polymer, PA0 b) from 0.5 to 3% by weight, based on a), of a coating containing PA1 b1) from 10 to 70% by weight of finely divided silica; PA1 b2) from 20 to 80% by weight of a hydroxy-containing quaternary ammonium salt PA0 and, if desired, p1 b3) from 0.05 to 20% by weight of a conventional coupling agent and/or PA0 c) from 1 to 8% by weight, based on a), of a C.sub.3 to C.sub.6 hydrocarbon as blowing agent, and, if desired, PA0 d) conventional additives in effective amounts.