Storage-stable polyurethane prepregs and mouldings produced therefrom composed of a polyurethane composition with liquid resin components

US10633519B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Emmanouil Spyrou · Schermbeck, DE
• Friedrich Georg Schmidt · Haltern am See, DE
• Eike Langkabel · Wegberg, DE
• Katharina Cielaszyk · Marl, DE
• Sandra Reemers · Munster, DE
• Holger Loesch · Herne, DE
• Elke Gollan · Herne, DE
• Marina Grammenos · Düsseldorf, DE

Key dates

• Filing date: Mar 21, 2012
• Grant date: Apr 28, 2020
• Expiry date: Jun 4, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Provided is a storage-stable polyurethane prepegs and mouldings produced therefrom composed of polyurethane compositions with liquid resin components, preferably liquid polyols. A prepeg contains(A)a fibrous support and (B)a matrix material containing a reactive polyurethane composition. The polyurethane composition contains a mixture of a liquid resin component(b)having a functional group reactive towards an isocyanate and having a glass transition temperature(Tg)or melting point below 25° C., with a hydroxyl number of 50 to 2000 mg KOH/gram, and a curing agent(a)comprising a di- or polyisocyanate internally blocked or blocked with a blocking agent. In addition, the polyurethane composition contains 0.6 to NCO equivalents or 0.3 to 1 uretdione group in (a) for each functional group of (b).