Oxazolidinone structures-containing prepolymeric epoxy resin mixture

US5496892A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Helmut Markert · Nuremberg, DE
• Klaus Kretzschmar · Erlangen, DE
• Michael Schreyer · Weisendorf, DE
• Gu/ nter Mennig · Darmstadt, DE
• Peter Braun · Landsberg am Lech, DE
• Oliver Eitel · Leingarten, DE

Key dates

• Filing date: Jan 12, 1995
• Grant date: Mar 5, 1996
• Expiry date: Jan 12, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/03
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for producing a prepolymer epoxy resin mixture with oxazolidinone structures, a filler-containing thermally polymerizable reaction resin mixture of polyepoxy resin, consisting of a mixture of di- and multifunctional epoxy resins, and polyisocyanate resin, with a molar ratio of the epoxy groups to the isocyanate groups of >1, is fed to a continuously working reactor. With substituted imidazole as reaction accelerator, amounting to 0.5-2.5% of the polyepoxy resin, the reaction resin mixture is then reacted at temperatures up to 200.degree. C., with reactor temperature at 140.degree.-190.degree. C., and following that the extruded material is cooled down to a temperature of <50.degree. C. with the aid of a cooling device mounted at the outlet die of the reactor.