Particulate styrene polymers containing blowing agent

US4369227A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hahn · Lampertheim, DE
• Hans Peter Rath · Havelsee, DE
• Heinz Krapf · Grünstadt, DE
• Isidoor De Grave · Monsheim, DE
• Manfred Walter · Nuremberg, DE

Key dates

• Filing date: Mar 10, 1982
• Grant date: Jan 18, 1983
• Expiry date: Mar 10, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Particulate styrene polymers which contain a blowing agent and are surface-coated with from 0.05 to 1% by weight of an ester. The coating agent is a hydroxycarboxylic acid ester, or an ester of a carboxylic acid with an oxyalkylated alcohol; tristearyl citrate is a preferred ester. The styrene polymers can be used to produce foam moldings, with short mold dwell times and good welding of the foam particles.