Cyanoethylated polyamide amines as hardeners for polyepoxides

US4263162A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Hans-Josef Buysch · Krefeld, DE
• Hermann Gruber · Leverkusen, DE
• Wolfgang Wellner · Bensberg, DE
• Karl Leiritz · Monheim, DE

Key dates

• Filing date: Dec 10, 1979
• Grant date: Apr 21, 1981
• Expiry date: Dec 10, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G59/54
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Hardeners for polyepoxides containing more than one, 1,2-epoxide group per molecule comprising a cyanoethylated polyamide amine containing free secondary or primary or secondary and primary amino groups, said cyanoethylated poly-amide amine is a reaction product of polyadded units of PA1 (A) 1 mole of a polyamine corresponding to the formula: ##STR1## in which p=0, n=2 or 3, m=0 to 6 and X=NH.sub.2, or p=1, n=2 or 3, m=0 and X=H, PA1 (B) from 0.5 to 2.3 moles of a saturated lactam, and PA1 (C) from 0.4 to 2.8 moles of acrylonitrile, methacrylonitrile or mixtures thereof. The hardener may be additionally modified with from 0.01 to 1.8 moles of a 1,2-alkylene oxide containing from 2 to 4 carbon atoms or with from 0.001 to 0.3 moles of a carboxylic acid or with the 1,2-alkylene oxide and the carboxylic acid in the quantities indicated, based in each case on 1 mole of the polyamine. The hardeners harden with 1,2-polyepoxides even in thin layers, over a period of 24 hours at room temperature to form clear, smooth films having a non-tacky fault-free surface.