| 摘要 |
<p>1276646 Curing epoxy resins RHONE POULENC SA 29 May 1970 [30 May 1969] 26147/70 Headings C3B and C3R Epoxy resins are cured by heating (e.g. to 180-280‹ C.) with a prepolymer (m.p. < 200‹ C.) obtained by heating an N,N<SP>1</SP>-bis-imide in which D is a divalent organic radical containing a C=C double bond and A is a divalent organic radical containing at least two carbon atoms, with a diamine B(NH 2 ) 2 (II) in which B is a divalent radical of not more than 30 carbon atoms. The molar ratio I : II is at least 1. The prepolymer may be formed in situ by heating the epoxy resin with a mixture of I and II. The prepolymer may comprise 20-80% of the combined weight of epoxy resin and prepolymer. Examples of I are N,N<SP>1</SP>-4,4<SP>1</SP>-diphenyl ether-bismaleimide, N,N<SP>1</SP> - 4,41 - diphenylmethane - bismaleimide, N,N<SP>1</SP>-meta-phenylene-bis-maleimide and N,N<SP>1</SP>-4,4<SP>1</SP>-diphenylmethane-bis-maleimide. II may be bis(4-aminophenyl)methane or bis- (4-aminophenyl)ether.</p> |
