Enhanced barrier film and laminate and method for producing same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-027/00
B29C-055/00
출원번호
US-0210323
(1998-12-11)
발명자
/ 주소
Mathis, Michael P.
출원인 / 주소
Kimberly-Clark Worldwide, Inc.
대리인 / 주소
Pauley Petersen Kinne & Erickson
인용정보
피인용 횟수 :
11인용 특허 :
29
초록▼
A breathable barrier film laminate having a microporous multilayer film formed by extruding a polymer loaded with a filler having a particle size suitable for pore formation, hot blowing the extruded film, forming a hot blown film bubble, collapsing the hot blown film bubble, forming a multilayer fi
A breathable barrier film laminate having a microporous multilayer film formed by extruding a polymer loaded with a filler having a particle size suitable for pore formation, hot blowing the extruded film, forming a hot blown film bubble, collapsing the hot blown film bubble, forming a multilayer film and stretching the multilayer film, forming a plurality of micropores, and a nonwoven web material layer bonded to at least one surface of the microporous multilayer film. The breathable barrier film laminate is particularly suitable for use in protective apparel such as surgical gowns, surgical drapes, and coveralls.
대표청구항▼
1. A method for producing a stretched moisture vapor permeable multi-ply film comprising the steps of: extruding a polymer comprising a filler having a particle size suitable for pore formation, said polymer suitable for use as a polymeric film; hot blowing the extruded film, forming a hot blown
1. A method for producing a stretched moisture vapor permeable multi-ply film comprising the steps of: extruding a polymer comprising a filler having a particle size suitable for pore formation, said polymer suitable for use as a polymeric film; hot blowing the extruded film, forming a hot blown film bubble; collapsing said hot blown film bubble, forming a multi-ply film comprising a plurality of film plies; and stretching said plurality of film plies, forming a stretched multi-ply film having a plurality of micropores in each of said film plies, said micropores having an average pore size not greater than about 0.06 microns; wherein the stretched multi-ply film has a moisture vapor transmission rate of at least about 1200 grams/m2-24 hours and meets the barrier standards defined in ASTM F1670 and ASTM F1671. 2. A method in accordance with claim 1, wherein said filler comprises in a range of about 10% to about 50% by volume of said film. 3. A method in accordance with claim 2, wherein said filler comprises in a range of about 35% to about 40% by volume of said film. 4. A method in accordance with claim 1, wherein said micropores have an average pore size in a range of about 0.05 microns to about 0.06 microns. 5. A method in accordance with claim 1, wherein said filler comprises a plurality of CaCO3particles. 6. A method in accordance with claim 1, wherein said particle size of said filler is in a range of about 0.5 microns to about 8.0 microns. 7. A method in accordance with claim 6, wherein said particle size of said filler is in a range of about 0.7 microns to about 1.0 microns. 8. A method in accordance with claim 1, wherein said stretching of said film is in a machine direction. 9. A method in accordance with claim 1, wherein said film is stretched at a stretch ratio in a range of about 3.5:1 to about 5.0:1. 10. A method in accordance with claim 1, wherein a total film gauge of said stretched film is about 0.8 mils. 11. A method in accordance with claim 1, wherein said stretched film has a WVTR in a range of about 1200 g/m2/24 hours to about 4500 g/m2/24 hours. 12. A method in accordance with claim 1, wherein said stretched film is bonded to a nonwoven web material layer, forming a nonwoven/film laminate. 13. A method in accordance with claim 12, wherein said nonwoven web material layer is comprises a spunbond web. 14. A method in accordance with claim 1, wherein said stretched film is bonded to two nonwoven web material layers, forming a nonwoven/film/nonwoven laminate. 15. A method in accordance with claim 14, wherein each of said nonwoven web material layers comprises a spunbond web. 16. A method in accordance with claim 1, wherein said polymer comprises linear low-density polyethylene (LLDPE). 17. A method in accordance with claim 1, wherein a basis weight of said stretched film is in a range of about 0.6 osy to about 1.0 osy. 18. A method for producing a stretched moisture vapor permeable multi-ply film comprising the steps of: extruding a polymer comprising a filler having a particle size suitable for pore formation, said polymer suitable for use as a non-elastic polymeric film; hot blowing the extruded film, forming a hot blown film bubble; collapsing said hot blown film bubble, forming a multi-ply film comprising a plurality of film plies; and stretching said plurality of film plies, forming a plurality of micropores in each of said film plies, said micropores having an average pore size not greater than about 0.06 microns; wherein the stretched multi-ply film has a moisture vapor transmission rate of at least about 1200 grams/m2-24 hours and meets the barrier standards defined in ASTM F1670 and ASTM F1671.
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이 특허에 인용된 특허 (29)
Ito Osamu (Utsunomiya JPX) Mizutani Hiroshi (Yachiyo JPX), Absorbent article.
Lesca Giuseppe (Milan ITX) Giannella Vincenzo (Milan ITX), Bonded articles comprising a nonwoven fabric and a polyolefin film and the process for their preparation.
Braun Ralph V. (Roswell GA) Garrett Lance (Marietta GA) Phelan Robert J. (Woodstock GA) Yeo Richard S. (Dunwoody GA), Breathable, multilayered, clothlike barrier.
Lickfield Deborah K. (Easley SC) Berman Mark H. S. (Simpsonville SC) Hyslop Robert F. (Simpsonville SC) Oleszczuk Andrew R. (Simpsonville SC) Gessner Scott L. (Encinitas CA) Austin Jared A. (Greer SC, Composite nonwoven fabric and articles produced therefrom.
Leatherman Dennis D. (Pittsburgh PA) Rechlicz Thomas (Clinton OH) Schwarz Richard A. (Akron OH), Multilayer article of microporous and porous materials.
Pike Richard D. (Norcross GA) Brown Kurtis L. (Woodstock GA) Gwaltney Sharon W. (Woodstock GA) Herschberger Thomas A. (Appleton WI) Siegel Scott D. (Thomasville NC), Nonwoven multicomponent polymeric fabric and method for making same.
Jones, Gregory K.; McAmish, Larry Hughey; Wu, Pai-Chuan; Lilly, Kenneth L.; Shelley, Christopher Aaron; Wendorf, Mark Andrew, Multilayer microporous films and composites for barrier protective materials, and methods.
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