Multistage process for the preparation of poly(tetramethylene-adipamide)
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United States of America Patent
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Jan 12, 1988
Grant Date -
N/A
app pub date -
Jul 16, 1986
filing date -
Jul 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for the preparation of polyamides from 1,4-diaminobutane and adipic acid, wherein a 40 to 70% strength aqueous solution of the monomers is heated at 280.degree.-320.degree. C., preferably 290.degree.-310.degree. C., for a period of 5 to 30 minutes under a pressure of less than 8 bar, to give a precondensate having a relative viscosity of 1.05 to 2.0, and solid phase after-condensation at 180.degree.-260.degree. C.
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