US5482765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven fabric laminate with enhanced barrier properties
Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1994-04-05
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Granted: 1996-01-09
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Expires: 2014-04-05
Abstract
Abstract There is provided a laminate of nonwoven fabrics for barrier applications which has improved ratios of barrier and strength to weight, of softness to strength and of vapor transmission to barrier. The laminate has a meltblown layer sandwiched between spunbond layers to produce an SMS laminate. The meltblown and spunbond layers may have between 0.1 to 2.0 weight percent of a fluorocarbon and the meltblown layer preferably between 5 and 20 weight percent polybutylene. The laminate also may have pigments if desired. Such laminates are useful for garments.
Inventors
- 👤 Stephen S. Bradley
- 👤 David C. Strack
- 👤 Randall D. Lowery
- 👤 Deborah J. Zemlock
- 👤 Mary K. Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:05
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B27/18; B32B27/20; B32B27/32; B32B27/34; B32B27/36; B32B27/40; B32B5/02; B32B5/022; B32B5/06; B32B7/00; B32B7/04; B32B7/12; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/559; D04H1/56; D04H3/00; D04H3/08; D04H3/14; D06; D06M; D06M17/00; B32B2250/00; B32B2250/03; B32B2250/20; B32B2250/24; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0261; B32B2262/0276; B32B2262/0292; B32B2270/00; B32B2305/00; B32B2305/10; B32B2305/20; B32B2307/00; B32B2307/20; B32B2307/21; B32B2323/00; B32B2323/10; B32B2367/00; B32B2375/00; B32B2377/00; B32B2437/00; B32B2535/00; B32B2555/00; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/614; Y10T442/62; Y10T442/659; Y10T442/66
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
A nonwoven laminate comprising: a first layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising continuous filaments having an average diameter of greater than 10 microns and being prepared from a thermoplastic polymer; a second layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising filaments having an average diameter of less than 10 microns and being prepared from a mixture of a thermoplastic polyolefin, from about 5 to about 15 weight percent polybutylene, and a fluorocarbon compound in an amount from about 0.1 to 2.0 weight percent to impart low surface tension liquid repellency; a third layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising continuous filaments having an average diameter of greater than 10 microns and being prepared from a thermoplastic polymer; wherein said layers are thermally bonded to form a laminate having a ratio of hydrohead to said second layer basis weight of greater than 115 cm/osy, a ratio of resistance to blood penetration to said second layer basis weight of greater than 1 psi/osy, and a ratio of WVTR to hydrohead of less than 75 g/m 2 /day per cm.
Claim 2
Dependent Claim
204 words
A nonwoven laminate comprising: a first layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising continuous filaments having an average diameter of greater than 10 microns and being prepared from a thermoplastic polymer; a second layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising filaments having an average diameter of less than 10 microns and being prepared from a mixture of a thermoplastic polyolefin, from about 5 to about 15 weight percent polybutylene, and a fluorocarbon compound in an amount from about 0.1 to 2.0 weight percent to impart low surface tension liquid repellency; a third layer of a nonwoven web having a basis weight between 5 and 70 gsm and comprising continuous filaments having an average diameter of greater than 10 microns and being prepared from a thermoplastic polymer; wherein said layers are thermally bonded to form a laminate having a ratio of hydrohead to said second layer basis weight of greater than 115 cm/osy, a ratio of resistance to blood penetration to said second layer basis weight of greater than 1 psi/osy, and a ratio of WVTR to hydrohead of less than 75 g/m 2 /day per cm.
Claim 3
Dependent Claim
27 words
The nonwoven laminate of claim 1 wherein said first and/or third layer further comprises a fluorocarbon compound in an amount from about 0.1 to 2.0 weight percent.
Claim 4
Dependent Claim
19 words
The nonwoven laminate of claim 1 wherein said first and/or third layer further comprises a topically applied antistatic treatment.
Claim 5
Dependent Claim
10 words
The nonwoven laminate of claim 1 which has been necksoftened.
Claim 6
Dependent Claim
27 words
The laminate of claim 1 wherein said thermoplastic polymer in said second layer is a polypropylene which has a melt flow rate of around 3000 grams/10 minutes.
Claim 7
Dependent Claim
23 words
The laminate of claim 1 wherein at least one of said layers has pigment present in an amount less than 5 weight percent.
Claim 8
Dependent Claim
12 words
The laminate of claim 1 in the form of a surgical gown.
Claim 9
Dependent Claim
12 words
The laminate of claim 1 in the form of a face mask.
Claim 10
Dependent Claim
12 words
The laminate of claim 1 in the form of a sterilization wrap.
Claim 11
Dependent Claim
12 words
The laminate of claim 1 in the form of a car cover.
Claim 12
Dependent Claim
12 words
The laminate of claim 1 in the form of a boat cover.
Claim 13
Dependent Claim
12 words
The laminate of claim 1 in the form of a camper/trailer fabric.
Claim 14
Dependent Claim
12 words
The laminate of claim 1 in the form of an agricultural fabric.
Claim 15
Dependent Claim
23 words
The laminate of claim 1 wherein said laminate has a ratio of BFE to second layer basis weight of greater than 180 percent/osy.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |