Expandable polystyrene particles

US5985943A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hahn · Lampertheim, DE
• Horst Steinbrecher · Münstermaifeld, DE
• Dieter Naegele · Worms, DE
• Achim Löffler · Speyer, DE
• Manfred Gurtler · Mannheim, DE
• Hagen Schmitt · Ludwigshafen, DE
• Jurgen Reichert · Schifferstadt, DE

Key dates

• Filing date: Nov 12, 1998
• Grant date: Nov 16, 1999
• Expiry date: Nov 12, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2325/04
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to expandable polystyrene beads containing blowing agent which are coated with from 0.01 to 0.5% by weight of a hydrophobicizing agent which melts above 25.degree. C. and has a mean particle size of less than 100 .mu.m. The beads can be converted into foam moldings having reduced water absorption capacity.