Patent · US Active

Process for producing polystyrene foam particles having a high density

US8168096B2 · kind B2 · utility

1Cited by

4References

10Claims

0Family size

Assignee

BASF SE

Inventors

Markus Allmendinger · Deggingen, DE
Klaus Hahn · Lampertheim, DE
Joachim Ruch · Monsheim, DE

Key dates

Filing date	Apr 5, 2006
Grant date	May 1, 2012
Priority date	—
Expiry date	Jan 10, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2325/06
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process for producing polystyrene foam particles having a bulk density in the range from 40 to 400 g/l by extrusion of a polystyrene melt comprising carbon dioxide and/or water as blowing agent through a nozzle and underwater pelletization, wherein the underwater pelletization is carried out at a pressure in the range 1-30 bar.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.