Polyamide gel removal
AssigneeE. I. Du Pont de Nemours and Company
InventorT. A. Wood
Life of this patent
Estimating the term…
Abstract
Gelled polyamides are contacted with organic hydroxyl group-containing compounds to so modify the physical nature of the gels as to permit their flushing from process equipment.
Claims12
A process for rendering an aliphatic polyamide gel readily flushed which comprises contacting said gel at a temperature of about from 100.degree. to 300.degree. C and for a period of about from 15 minutes to 12 hours with at least one compound having at least one alcoholic or phenolic hydroxyl group in amounts sufficient to maintain the concentration of dissolved ungelled polyamide below about 10 percent by weight, the compound being liquid at the contact temperature and having:
- a. an infrared absorption characterized by a wavelength difference of at least about 0.2 micron in hydroxyl group stretching frequency when measured in carbon tetrachloride and tetrahydrofuran;
- b. a normal boiling point greater than about 100.degree. C;
- and
- c. not more than one aliphatic carbon-carbon double bond per molecule.
Dependencies are inferred from the claim text.