Process for the short-time treatment of a plastic melt with a liquid treatment agent and the plastic thus produced

US5548033A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Heinz Vetter · Weiterstadt, DE
• Werner Hoess · Griesheim, DE
• Joachim Dutschke · Bensheim, DE
• Hartmut Schikowsky · Darmstadt, DE

Key dates

• Filing date: Jan 27, 1995
• Grant date: Aug 20, 1996
• Expiry date: Jan 27, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/03
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A plastic melt is treated for a short-time with a liquid treatment agent under pressure, it is divided into defined subquantities, individual subquantities are brought into contact with a treatment agent and combined for a residence time of less than one second with portions of at least one other subquantity, and portions of the mixture thus formed are separated and combined with another subquantity; the steps of dividing and combining the mixture are repeated several times at intervals of less than one second until an intimate mixture of the plastic melt and the treatment agent has formed, allowing the preparation of especially homogeneously structured thermoplastic materials, e.g., poly(methacrylalkylimide) plastics, which are compatible with poly(methyl methacrylate).