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US 4,842,792 AGranted
Drafting process for preparing a modified polyester fiber
AssigneeEastman Kodak Company
InventorsShriram Bagrodia, Bobby M. Phillips
Life of this patent
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Abstract
Preparation of a novel polyester fiber, such as a poly(ethylene terephthalate) fiber, having at least one continuous groove wherein the surface of the groove is rougher than the surface outside the groove is accomplished through a drafting process involving surface hydrolysis. The fibers have improved cover, softness, and wetting characteristics.
Claims17
A drafting process for preparing a modified polyester fiber comprising:
- hydrolyzing and drafting an unhydrolyzed polyester fiber having formed therein and extending along the length thereof at least one continuous groove.
- wherein the cross-section of said fiber has at least one groove such that 0.15 .ltoreq.W/H .ltoreq.8.0 where W is width of the groove and H is height of the groove;
- said hydrolyzing ocurring to the extent necessary to modify said polyester fiber such that the mean EB Roughness at the bottom of said groove is about 10% to about 600% higher than the mean EB Roughness outside said groove.
A drafting process for preparing a modified polyester fiber comprising:
- (a) contacting an alkaline medium and an unhydrolyzed polyester fiber having formed therein and extending along the length thereof at least one continuous groove, wherein the cross-section of said fiber has at least one groove such that 0.15 .ltoreq.W/H .ltoreq.8.0 where W is width of the groove and H is height of the groove:
- and
- (b) heating and drafting the fiber treated by step (a) to the extent necessary to modify said polyester fiber such that the mean EB Roughness at the bottom of said groove is about 10% to about 600% higher than the mean EB Roughness outside said groove.
Dependencies are inferred from the claim text.