The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 1981
Filed:
May. 07, 1979
Thomas C Allen, Asheville, NC (US);
David B Denning, Asheville, NC (US);
Akzona Incorporated, Asheville, NC (US);
Abstract
A regenerated cellulose fiber containing an alloying polymer of acrylic acid or methacrylic acid, or a copolymer containing acrylic and methacrylic acid moieties or an alkali metal or ammonium salt thereof or other anionic alloying polymers or copolymer is prepared by a process wherein the alloying polymer is mixed with a viscose solution of known unreacted sodium hydroxide concentration, the sodium hydroxide concentration in the resulting mixture is increased to compensate for any loss in concentration due to neutralization and/or dilution effects by the addition of the alloying polymer to the viscose. Increasing the sodium hydroxide concentration greater than that required to restore the concentration to the original level has resulted in dramatic increases in absorbency. The resulting viscose solution is extruded into a spin bath in which the sulfuric acid concentration is reduced so that the resulting fibers will have at least 90% of the crimp of a fiber produced from the viscose solution without alloying polymer or copolymer.