Low stress relaxation elastomeric nonwoven webs and fibers
First Claim
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1. An elastic nonwoven web comprising a coherent matrix of fibers formed from an extrudable blend, the blend comprising:
- (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 said elastic nonwoven web has a stress relaxation of less than about 30 percent.
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Abstract
An elastic nonwoven web is formed from elastic fibers composed of a blend of (1) a styrene-poly(ethylenepropylene)-styrene thermoplastic elastomeric block copolymer or a mixture of a styrene-poly(ethylenepropylene)-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.
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Citations
30 Claims
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1. An elastic nonwoven web comprising a coherent matrix of fibers formed from an extrudable blend, the blend comprising:
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(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 said elastic nonwoven web has a stress relaxation of less than about 30 percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An elastic nonwoven web consisting essentially of a coherent matrix of fibers formed from an extrudable blend, the blend including:
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(A) an elastomeric polymer selected form 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, wherein said elastic nonwoven web has a stress relaxation of less than about 30 percent.
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14. A elastic nonwoven web comprising:
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(A) a coherent matrix of elastic fibers formed from an extrudable blend, the blend comprising; (i) an elastomeric polymer selected form the group consisting of styrene-poly(ethylene-propylene)-styrene elastomeric block copolymer and a mixture of a styrene-poly(ethylenepolypropylene)-styrene and a styrene-poly(ethylenebutylene)-styrene elastomeric block copolymer; and (ii) a tackifying resin, and (B) at least one other material selected form the group consisting of nonelastic fibers and particulates; and wherein said web has a stress relaxation of less than about 30 percent. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An elastic nonwoven web consisting essentially of:
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(A) a coherent matrix of elastic fibers formed from an extrudable blend, the blend including; (i) 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 a copolymers; (ii) a polyolefin; (iii) a tackifying resin; and (iv) an extending oil, and (B) at least one other material selected from the group consisting of nonelastic fibers and particulates; and wherein said web has a stress relaxation of less than about 30 percent.
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Specification