Low stress relaxation elastomeric fibers
AssigneeKimberly-Clark Corporation
InventorsL. Warren Collier, IV, Steven R. Stopper
Life of this patent
Estimating the term…
Abstract
An elastic nonwoven web is formed from elastic fibers composed of a blend of (1) a styrene-poly(ethylene-propylene)-styrene thermoplastic elastomeric block copolymer or a mixture of a styrene-poly(ethylene-propylene)-styrene elastomeric block copolymer and a styrene-poly(ethylene-butylene)-styrene elastomeric block copolymer, and (2) a tackifying resin in which the elastic nonwoven web has a stress relaxation of less than about 30 percent. The blend used to form the elastic nonwoven web and/or elastic fibers may also include a polyolefin and an extending oil.
Claims17
Elastic fibers formed from an extrudable blend, the blend including:
- (A) an elastomeric polymer selected from the group consisting of styrene-poly(ethylene-propylene)-styrene elastomeric block copolymer and a mixture of styrene-poly(ethylene-polypropylene)-styrene and styrene-poly(ethylene-butylene)-styrene elastomeric block copolymers;
- and
- (B) a tackifying resin,
- wherein the fibers are adapted to form a nonwoven elastic web having a stress relaxation of less than about 30 percent.
Elastic fibers formed from an extrudable blend, the blend consisting essentially of:
- (A) an elastomeric polymer selected from the group consisting of styrene-poly(ethylene-propylene)-styrene elastomeric block copolymer and a mixture of styrene-poly(ethylene-polypropylene)-styrene and styrene-poly(ethylene-butylene)-styrene elastomeric block copolymers;
- (B) a polyolefin;
- (C) a tackifying resin;
- and
- (D) an extending oil, and
- wherein said fibers are adapted to form a nonwoven elastic web having a stress relaxation of less than about 30 percent.
Elastic fibers formed from an extrudable blend, the blend comprising:
- (A) from about 50 to about 80 percent, by weight, of an elastomeric polymer selected from the group consisting of styrene-poly(ethylene-propylene)-styrene elastomeric block copolymer and a mixture of styrene-poly(ethylene-polypropylene)-styrene and styrene-poly(ethylene-butylene)-styrene elastomeric block copolymers;
- (B) from about 3 to about 23 percent, by weight, of a polyolefin;
- (C) from about 15 to about 28 percent, by weight, of a tackifying resin;
- and
- (D) from about 0 to about 15 percent, by weight, of an extending oil, and
- wherein said fibers are adapted to form a nonwoven elastic web having a stress relaxation of less than about 30 percent.
Dependencies are inferred from the claim text.