Copolymers, devoid of rubber, with low residual monomer content and a method and device for producing the same

US7153929B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Alfred Eitel · Dormagen, DE
• Klemens Kohlgrüber · Lingen (Ems), DE
• Frank Weyrich · Senningerberg, LU
• Peter Rudolph · Berlin, DE
• Hans-Jürgen Thiem · Dormagen, DE
• Michael König · Frankfurt, DE
• Ricarda Nothelle · Shanghai, CN
• Helmut Meyer · Hilden, DE

Key dates

• Filing date: Jun 18, 2001
• Grant date: Dec 26, 2006
• Expiry date: Jun 18, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2219/00128
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Rubber-free copolymers of unsaturated monomers selected from the group comprising styrenes and vinyl cyanides are disclosed. The copolymers that contain 65 to 80 wt. %, of styrene and 20 to 35 wt. % of acrylonitrile are characterized in their low content of residual monomers and improved physical properties. Also disclosed are a process and a device for the preparation of these copolymers.