Particulate expandable styrene polymers for the manufacture of foams

US4086191A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Hinselmann · Mutterstadt, DE
• Klaus Penzien · Bischofswerda, DE
• Rupert Schick · Schifferstadt, DE
• Manfred Walter · Nuremberg, DE
• Heinz Weber · Uerdingen, DE
• Heinrich Wirth

Key dates

• Filing date: Oct 2, 1975
• Grant date: Apr 25, 1978
• Expiry date: Oct 2, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/908
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Particulate expandable styrene polymers which contain from 0.0001 to 0.2% by weight, based on the styrene polymer, of an inhomogeneously distributed nucleating agent for expandable polystyrene, the nucleating agent being present only in a peripheral zone of the particles while the interior of the particles is free from nucleating agent. Nucleating agents which may be used are organic compounds having at least three bromine atoms, bonded to aliphatic or cycloaliphatic structures, in the molecule, or bromine compounds which are polymerizable, or are copolymerizable with styrene.