Expandable styrene polymers

US5525637A · kind A · utility

Assignee

• BASF SE

Inventors

• Rolf Henn · Ketsch, DE
• Klaus Hahn · Lampertheim, DE
• Andreas Deckers · Flomborn, DE
• Wolfgang Loth · Bad Dürkheim, DE
• Uwe Blumenstein · Ludwigshafen, DE
• Hans-Dieter Schwaben · Freisbach, DE
• Erich Klement · Rimbach, DE

Key dates

• Filing date: May 12, 1995
• Grant date: Jun 11, 1996
• Expiry date: May 12, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2351/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to expandable styrene polymers for elastic polystyrene foams, comprising a) from 50 to 90% by weight of polystyrene and/or a styrene copolymer containing at least 50% by weight of copolymerized styrene, b) from 5 to 30% by weight of at least one styrene-soluble elastomer, c) from 5 to 20% by weight of at least one block copolymer containing styrene as one component, d) from 1 to 15% by weight, based on the sum of a), b) and c), of a low-boiling blowing agent, and, if desired, e) conventional additives in effective amounts, PA0 where, in the unfoamed polystyrene beads, component b) is in the form of cell particles and component c) is in the form of particles having a mean size of from 0.2 to 2 .mu.m in the polystyrene phase, and to foams and foam moldings produced therefrom.