Polycondensates
First Claim
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1. Processes for the production of a polycondensate linked through five membered nitrogen containing rings, wherein unsaturated cyclic carboxylic acid anhydride compounds corresponding to the general formula:
- ##STR6## in which R1 represents a mono-unsaturated organic radical, is reacted with a monofunctional or polyfunctional aliphatic, aliphatic-aromatic or aromatic alcohol and a polyfunctional organic isocyanate at a temperature in the range from 0°
C. to 500°
C.
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Abstract
A process for the production of polycondensates linked by nitrogen containing five membered rings, wherein a unsaturated cyclic anhydride compound is polycondensed with alcohols and organic polyisocyanates.
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Citations
12 Claims
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1. Processes for the production of a polycondensate linked through five membered nitrogen containing rings, wherein unsaturated cyclic carboxylic acid anhydride compounds corresponding to the general formula:
- ##STR6## in which R1 represents a mono-unsaturated organic radical, is reacted with a monofunctional or polyfunctional aliphatic, aliphatic-aromatic or aromatic alcohol and a polyfunctional organic isocyanate at a temperature in the range from 0°
C. to 500°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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4. Processes as claimed in claim 3, wherein the alcohol is an aliphatic diol.
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5. Processes as claimed in claim 1, wherein in the general formula R1 represents a mono-unsaturated aliphatic radical with C2 -C10.
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6. Processes as claimed in claim 1 wherein the unsaturated cyclic carboxylic acid anhydride is the anhydride of maleic acid, dimethyl- or dichloro-maleic acid, citraconic acid or itaconic acid.
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7. Processes as claimed in claim 1, wherein in a first step, the polyisocyanate is reacted with the alcohol to form a carbamic ester which, in a second step, is subsequently reacted with the acid anhydride.
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8. Processes as claimed in claim 1, wherein, in a first step, the acid anhydride is reacted with the alcohol to form a semiester which is subsequently reacted with the polyisocyanate.
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9. Processes as claimed in claim 1, wherein the polycondensation reaction is carried out in the presence of an organic polycarboxylic acid and an aliphatic polyol.
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10. Processes as claimed in claim 1, wherein the polycondensation reaction is carried out in the presence of a saturated cyclic carboxylic acid anhydride.
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11. Polycondensates obtained by a process claimed in claim 1.
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12. A wire insulated with a polycondensate as claimed in claim 11.
- ##STR6## in which R1 represents a mono-unsaturated organic radical, is reacted with a monofunctional or polyfunctional aliphatic, aliphatic-aromatic or aromatic alcohol and a polyfunctional organic isocyanate at a temperature in the range from 0°
Specification