| 发明名称 |
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| 摘要 |
<p>Aqueous thermosetting electrical insulating varnishes are prepared by a process wherein hydroxyl-containing polyester-imides which have kinematic viscosities of from 16 to 30 mm2 x s-1 and acid numbers of <10, and which have been obtained by condensing aromatic tricarboxylic acid monoanhydrides, aromatic dicarboxylic acids or their esterifiable or transesterifiable derivatives, diamines, diols, and triols containing an isocyanurate ring, are treated, at from 80 DEG to 130 DEG C., in the presence or absence of up to 5% by weight, based on polyester-imide, of an organic solvent, with from 5 to 15% by weight, based on polyester-imide, of ammonia in the form of an aqueous solution, thereby producing aminolysis and hydrolysis so that a neutral or slightly acidic solution results, which is diluted to a viscosity of from 100 to 10,000 mPa.s by adding demineralized water, from 0.1 to 5% by weight, based on polyester-imide, of a water-soluble curing catalyst being added, if desired, after the treatment with ammonia. The electrical insulating varnishes are used as wire enamels or as impregnating varnishes.</p> |
| 申请公布号 |
DE3121306(C2) |
申请公布日期 |
1987.01.02 |
| 申请号 |
DE19813121306 |
申请日期 |
1981.05.29 |
| 申请人 |
DR. BECK & CO AG, 2000 HAMBURG, DE |
发明人 |
REITER, UDO, DIPL.-CHEM. DR., 6704 MUTTERSTADT, DE;SCHENCK, HANS-UWE, DIPL.-CHEM. DR., 6706 WACHENHEIM, DE;LEHMANN, HELMUT, 2057 REINBEK, DE;HANSCH, FERDINAND, DIPL.-CHEM., 2000 WEDEL, DE |
| 分类号 |
C08L79/08;C08G73/00;C08G73/16;C08L67/00;C09D5/25;C09D179/08;H01B3/30;(IPC1-7):C09D5/25;C09D3/70 |
主分类号 |
C08L79/08 |
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