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US 5,582,786 AGranted
Method of producing fibre or film
AssigneeCourtaulds Fibres Limited
InventorsWilliam Brunskill, John F. Carefull, Paul J. Akers
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AssigneeCourtaulds Fibres Limited
InventorsWilliam Brunskill, John F. Carefull, Paul J. Akers
Estimating the term…
A water-absorbent water-insoluble fibre or film is produced by extruding an aqueous solution of a water-soluble polymer into a gaseous medium to form fibre or film. The extruded fibre or film is collected at a moisture content of 8 to 25% based on the dry weight of the fibre or film and is further dried at a temperature no greater than 100.degree. C. before crosslinking the fibre or film at a temperature in the range 125.degree. to 250.degree. C. to a degree sufficient that the crosslinked fibre or film is water-insoluble. The fibre or film entering the crosslinking step has a moisture content which is reduced, preferably by at least 5%, and which is in the range 0 to 10%. Heat-crosslinked fibre is preferably treated with moist air after crosslinking to raise the moisture content of the fibre to at least 10%, particularly if the fibre is for textile processing. Water-absorbent water-insoluble coatings can be produced by a similar process.
A method of producing water-absorbent water-insoluble fibre or film by extruding an aqueous solution of a water-soluble polymer into a gaseous medium to form fibre or film and crosslinking the fibre or film at a temperature in the range 125.degree. to 250.degree. C. to a degree sufficient that the crosslinked fibre or film is water-insoluble, in which process the extruded fibre or film is collected at a moisture content of 8 to 25% based on the dry weight of the fibre or film and is further dried at a temperature no greater than 100.degree. C. so that the fibre or film entering the crosslinking step has a lower moisture content in the range 0 to 10% based on the dry weight of the fibre or film.
A method of producing crosslinked fibre by spinning a crosslinkable polymeric material to form fibre and crosslinking the fibre at a temperature of between about 125.degree. C. to about 250.degree. C., in which process the crosslinked fibre is treated with moist air after crosslinking to raise the moisture content of the fibre to at least 10% based on the dry weight of the fibre, the moist air being passed through a bed of the crosslinked fibre on a porous support.
A method of producing a water-absorbent water-insoluble coating on a flexible substrate, wherein a flexible substrate is coated with an aqueous solution of a crosslinkable water-soluble polymer, the coating is dried to a moisture content of 8 to 25% by weight, and then further dried at a temperature no greater than 100.degree. C. to a lower moisture content in the range 0 to 10% by weight, and the further dried coating is crosslinked by heating at a temperature in the range 125.degree. to 250.degree. C.
A method of producing crosslinked fibre by spinning a crosslinkable polymeric material to form fibre and crosslinking the fibre at a temperature of between about 125.degree. C. to about 250.degree. C., in which process the crosslinked fibre is treated, after crosslinking, with moist air at a temperature of at least 50.degree. C. to raise the moisture content of the fibre to at least 10% based on the dry weight of the fibre.
Dependencies are inferred from the claim text.