| 摘要 |
<p>1393749 Insulated conductors GENERAL ELECTRIC CO 3 July 1972 [30 July 1971] 31099/72 Heading H1A [Also in Divisions B2 and C3] Cu wire and A1, which may have been previously coated with a base coat of polyester, polyesteramideimide, or polyesterimide, are coated with polyamic acid solution which is then cured to polyamideimide. The polyamic acids are made by (A) reacting (a) aliphatic diacid with (b) polyamine material comprising #10% equivalents of polyamine (IV) where n#0À1 on the average; and then (B) reacting the product of (A) with (c) organic dianhydride and (d) a specified aliphatically unsaturated organic dicarboxylic acid anhydride. In step (A) aromatic dicarboxylic acids or anhydrides, aliphatic anhydrides, or tricarboxylic acids or anhydrides may also be present. Diacid (a) may be saturated or unsaturated. Besides (IV), polyamine material (b) may include other polyamine(s). Long lists of all the above materials are given. The solvent may be cresylic acid, cyclohexanone, acetophenone, or mono- or polyalkyl-benzenes.</p> |
