| 摘要 |
<p>1404667 Polyamide-imide coatings TEIJIN LTD 11 Aug 1972 [12 Aug 1971 20 Sept 1971 (2) 28 Sept 1971 29 Sept 1971 28 Jan 1972] 37590/72 Heading B2E [Also in Division C3] Curable polyamide-imides in which at least 50 mol% of the repeating units are of the formula where Ar is an aromatic group and R, is an at least divalent organic group and which have an inherent viscosity of 0.1 to 0.03 (0.5 g/100 ml in N-methylpyrilidone at 30‹C) have as at least 30 mol % of the total terminal groups aryl ester groups 200C- bonded to carbon atoms of the residues of the polymer, Z being a monovalent aromatic group bonded through an aromatic ring carbon atom thereof to 0. Any remaining units of the polymer may be amide, ester, imide or ester-imide units and any remaining terminal groups may be carboxylic acid, anhydride or amide groups, up to C 3 alkyl ester groups, primary or secondary amino groups, hydroxyl or isocyanate groups, carbonic acid (methane) groups or carbamic acid amide (urea) groups. They may be prepared either by using an appropriate amount of a monomer from sheet 5-or by reacting a diaryl carbonate with a condensate from reactants in which the total carboxyl and anhydride groups is at least equal to the total amino and/or isocyanate groups. Numerous suitable reactants, solvents, catalysts and preparative methods are specified. Curable compositions are obtained by mixing or partially reacting the above polymers with polyfunctional compounds containing at least 2 alcoholic OH and/or amino groups the total number therof being at least equal to the total aryl ester groups in the polymer; they may be dissolved in an organic solvent and may be applied to an electrically conductive wire and cured to form an insulating coating. The curable compositions may also contain curing catalysts; modifiers which enhance the curability e.g. aryl polycarboxylates, blocked isocyanates, aryloxytriazines, polymethylolmelamine and polyalkoxysilanes; and other resin e.g. phenoplasts, aminoplasts, polyamide, polyimide, polyester, polyamideimide, polyesterimide, and vinyl-formed resins. Examples illustrate the coating of wire, copper or aluminium plate and glass sheets.</p> |
