Join
today

Boliven PRO is more than just patent search

  • Build and save lists using the powerful Lists feature
  • Analyze and download your search results
  • Share patent search results with your clients

Patents »

US6849324: Undirectionally cold stretched nonwoven webs of multipolymer fibers for stretch fabrics and disposable absorbent articles containing them

Share

Filing Information

Inventor(s) Barry DeWayne Meece · Thomas Edward Quantrille ·
Assignee(s) BBA Nonwovens Simpsonville, Inc. ·
Attorney/Agent(s) Alston & Bird LLP ·
Primary Examiner Elizabeth M. Cole ·
Application Number US9949108
Filing date 09/06/2001
Issue date 02/01/2005
Prior Publication Data
Predicted expiration date 12/02/2018
Patent term adjustment 26
U.S. Classifications 428/195  · 442/366  · 442/329  · 442/361  · 442/328  · 442/409  · 442/411  · 428/198  ·
International Classifications --
Kind CodeB2
International Classifications 428195 · 428198 · 442328 · 442329 · 442361 · 442366 · 442409 · 442411 ·
Related U.S. Application DataCROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation of application Ser. No. 09/187,677 filed Nov. 6, 1998 now abandoned.
20 Claims, 10 Drawings


Abstract

A nonwoven web of multipolymer fibers is described that is unidirectionally stretched and permanently elongated at ambient conditions and exhibits a substantial increase in tensile strength in the stretch direction. The ratio of tensile strength of the web in the direction of fiber orientation to the tensile strength in the other direction is at least about 10:1. The ratio of elongation at peak load in a direction transverse to the direction of fiber orientation is at least about 6:1. The multipolymer fibers normally are a blend of polyethylene and a polypropylene homopolymer or copolymer, one of which is a dominant phase and one of which is a dispersed phase. A third component having elastomeric properties that is at least partially miscible with one or both of the other components is included in some blends. The nonwoven webs are stretchable well beyond their initial dimensions in the direction perpendicular to the stretch direction and are especially useful in laminates with elastomeric members for use in disposable absorbent articles to impart elasticity thereto.

Independent Claims | See all claims (20)

  1. 1. A nonwoven web formed of highly elongatable multipolymer fibers, said fibers being substantially oriented in one direction, and said web having a plurality of discrete point bond sites throughout the web bonding the fibers together, said point bond sites comprising areas where the fibers have been fusion bonded together to form bond sites, said bond sites being imbedded within the web between opposite surfaces of the web and of a distorted, non-planar configuration extended generally in the Z-axis direction of the web, and said web having an extensibility in one direction of at least 100 percent when a load of 300 grams force per inch or less is applied in said one direction, and wherein the ratio of the tensile strength of the web in the direction of orientation of the fibers to the tensile strength in the direction transverse to the direction of orientation is at least about 10:1.
  2. 10. A nonwoven web formed of highly elongatable multipolymer fibers, said fibers being substantially oriented in one direction, said multipolymer fibers being formed from a blend comprising: a) isotactic polypropylene present in an amount of from about 65 to 80 percent by weight based upon the weight of said blend; b) linear low density polyethylene present in an amount of from about 1 to 5 percent by weight based upon the weight of said blend; and c) a block or grafted polyolefin copolymer or terpolymer having at least a portion of the chain thereof miscible with said isotactic polypropylene and wherein said block or grafted polyolefin copolymer or terpolymer is present in an amount of from about 15 to 30 percent by weight based upon the weight of said blend, said web having a plurality of discrete point bond sites throughout the web bonding the fibers together, said point bond sites comprising areas where the fibers have been fusion bonded together to form bond sites, said bond sites being imbedded within the web between opposite surfaces of the web and of a distorted, non-planar configuration extending generally in the z-axis direction of the web, said web having an extensibility in one direction of at least 300 percent when a load of 300 grams force per inch or less is applied in said one direction, and wherein the ratio of the tensile strength of the web in the direction of orientation of the fibers to the tensile strength in the direction transverse to the direction of orientation is at least about 10:1.
  3. 12. A bonded nonwoven web of multipolymer fibers, said nonwoven web having discrete bond sites throughout the web bonding the fibers together, said bond sites comprising a first plurality of bond sites where the fibers have been fusion bonded together and the bond sites are of a distorted, non-planar configuration extending generally in the z-axis direction of the web, and said web additionally including a second plurality of second bond sites that are generally planar and extend parallel to the surface of the web.
  4. 17. A nonwoven web comprising a plurality of spunbond continuous filaments formed of a blend of two immiscible polymer phases and a third component which is at least partially miscible with the two immiscible polymer phases, said web having a plurality of discrete point bond sites throughout the web bonding the continuous filaments together, said web having an extensibility in one direction of at least 70 percent when a load of less than or equal to 300 grams per inch is applied to said web in said one direction.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3952073 Toyo Boseki Kabushiki Kaisha Isaka et al. Apr 1976
US3969562 Matsushita Electric Industrial Co., Ltd. Suzuki Jul 1976
US4048364 Exxon Research and Engineering Company Harding et al. Sep 1977
US4116892 Biax-Fiberfilm Corporation Schwarz Sep 1978
US4153664 SABEE REINHARDT N Sabee May 1979
US4153751 Biax-Fiberfilm Corporation Schwarz May 1979
US4223063 Sabee Sep 1980
US4285100 Biax Fiberfilm Corporation Schwarz Aug 1981
US4289832 Biax Fiberfilm Corp. Schwarz Sep 1981
US4293608 Toyo Baseki Kabushiki Kaisha Isaka et al. Oct 1981
US4343852 Toyo Boseki Kabushiki Kaisha Isaka et al. Aug 1982
US4621119 Mobil Oil Corporation Lu Nov 1986
US4908253 RASMUSSEN O B Rasmussen Mar 1990
US4981747 Kimberly-Clark Corporation Morman Jan 1991
US5108827 Fiberweb North America, Inc. Gessner Apr 1992
US5114781 Kimberly-Clark Corporation Morman May 1992
US5208098 Amoco Corporation Stover May 1993
US5238733 Minnesota Mining and Manufacturing Company Joseph et al. Aug 1993
US5242436 The Procter & Gamble Company Weil et al. Sep 1993
US5244482 The University of Tennessee Research Corporation Hassenboehler, Jr. et al. Sep 1993
US5296289 Collins Mar 1994
US5422172 Clopay Plastic Products Company, Inc. Wu Jun 1995
US5683787 Corovin GmbH Boich et al. Nov 1997
US5804286* Fiberweb North America, Inc. Quantrille et al. Sep 1998
US5851935 BBA Nonwovens Simpsonville, Inc. Srinivasan et al. Dec 1998

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
EP0127483Johnson & JohnsonDec 1984
EP0685586INTERNATIONAL PAPER COMPANYDec 1995
WO199616216May 1996
* cited by examiner