Patent · US Expired

Preparation of toughened polystyrene molding materials

US5795938A · kind A · utility

4Cited by

9References

8Claims

0Family size

Assignee

BASF SE

Inventors

Konrad Knoll · Mannheim, DE
Wolfgang Loth · Bad Dürkheim, DE
Wolfgang Fischer · Meerbusch, DE
Hermann Gausepohl · Mutterstadt, DE

Key dates

Filing date	Jun 16, 1997
Grant date	Aug 18, 1998
Priority date	—
Expiry date	Jun 16, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L53/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Toughened vinyl aromatic compounds, in particular high impact polystyrene, are prepared by a continuous process in which the vinyl aromatic compound and the impact modifier, an elastomeric block copolymer, are each prepared separately in a reaction zone by anionic polymerization, with or without heat exchange with the environment and, if required, with the addition of a solvent, and are polymerized until complete conversion is achieved, and the living chain ends are terminated in a manner known per se, and a thermoplastic, toughened molding material is based on a vinyl aromatic compound having a residual content of less than 50 ppm of monomers and less than 100 ppm of oligomers.

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