Polyimide-esters and filaments
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert S. Irwin
Life of this patent
Estimating the term…
Abstract
High modulus filaments are melt-spun from polyimide-esters derived from I 6-hydroxy-2-naphthoic acid, a diphenol and 4-carboxy-N-(p-carboxyphenyl)-phthalimide; II 6-hydroxy-2-naphthoic acid, an aromatic dicarboxylic acid 4-hydroxy-N-(p-hydroxyphenyl)phthalimide; or III 6-hydroxy-2-naphthoic acid, 4-hydroxybenzoic acid and 4-carboxy-N-(p-hydroxyphenyl)phthalimide. The polyimide esters are optically anisotropic in the melt. As-spun filaments from these polymers can be heat treated while free from tension to increase their tenacity.
Claims8
A melt-spinnable polyimide-ester capable of forming an optically anisotropic melt consisting essentially of units having structural formulas as follows:
- ##STR12## such that in I and II, unit ##STR13## is present in an amount of from 10 to 30 mole percent, and the dioxy units and dicarbonyl units are present in substantially equimolar amounts with Ar in I being chloro- or methyl-p-phenylene, and Ar in II being p-phenylene;
- and such that in III, unit ##STR14## is present in an amount of from 40 to 60 mole percent, with each of the other units being present in an amount of from 20 to 30 mole percent.
A melt-spinnable polyimide-ester capable of forming an optically anisotropic melt consisting essentially of units having structural formulas as follows:
- ##STR15## such that ##STR16## is present in an amount of from 10 to 30 mole percent, the dioxy units and dicarbonyl units are present in substantially equimolar amounts and Ar is chloro-p-phenylene.
A melt-spinnable polyimide-ester capable of forming an optically anisotropic melt consisting essentially of units having structural formulas as follows:
- ##STR17## such that ##STR18## is present in an amount of from 10 to 30 mole percent, the dioxy units and dicarbonyl units are present in substantially equimolar amounts and Ar is p-phenylene.
A melt-spinnale polyimide-ester capable of forming an optically anisotropic melt consisting essentially of units having structural formulas as follows:
- ##STR19## such that ##STR20## is present in an amount of from 40 to 60 mole percent, the other units each being present in an amount of from 20 to 30 mole percent.
Dependencies are inferred from the claim text.