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US 6,582,644 B2Granted
Method for producing hollow rayon fibers
AssigneeSK Chemicals Co., Ltd.
InventorsIk Soo Kim, Jong Soo Ahn, Byoung Hak Kim
Life of this patent
Estimating the term…
Abstract
Disclosed is a simple and safe method for producing hollow rayon fibers, which are light and heat-insulating. The fibers, having a cross section of FIG. 1, are produced by forming a cellulose layer with a mixed crystalline structure of cellulose II and IV through selective saponification of a portion of cellulose acetate fibers with the use of alkali, followed by dissolving a portion which remains unsaponified, with the use of an organic solvent.
Claims5
A method for producing hollow rayon fibers, comprising the steps of:
- saponifying cellulose acetate fibers with substitution of 2.0 to 3.0 (acetification of 45 to 62.5%) to substitute 27 to 75% of the total acetyl groups of the cellulose acetate fibers with hydroxyl groups;
- and
- dissolving an inner layer of the cellulose acetate fibers to form a hollow cavity, said inner layer remaining unsaponified after the saponifying step.
Dependencies are inferred from the claim text.