Polyurethane elastic fiber, gather member containing same, and sanitary material
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsRyosuke Yokoo, Keiichi Toyoda, Shogo Ikeda
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Abstract
The present invention provides a thermoplastic polyurethane elastic fiber which exhibits excellent runnability during the production process of paper diapers. A polyurethane elastic fiber according to the present invention has the following characteristics: (a) the polyurethane elastic fiber is composed of a multifilament; (b) the total fineness thereof is from 160 dtex to 2,000 dtex; (c) the outflow start temperature thereof is from 160° C. to 220° C. as measured by a flow tester at an extrusion load of 49 N, a start temperature of 120° C. and a heating rate of 3° C./min; and (d) the bonding force between single yarns is 0.4 cN or more.
Claims8
A thermoplastic polyurethane elastic fiber having the following features:
- (a) being a multifilament;
- (b) having a total fineness of 160 dtex or more and 2000 dtex or less;
- (c) an outflow start temperature in a flow tester of 160° C. or higher and 220° C. or lower under conditions of an extrusion load of 49 N, an initial temperature of 120° C., and a temperature elevation rate of 3° C./min;
- (d) having an inter-yarn bonding force of 0.4 cN or more;
- and
- (e) having a birefringence Δn of 0.010 or greater.
Dependencies are inferred from the claim text.