Patent US5271883A successfully refreshed from Google Patents.
US5271883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making nonwoven web with improved barrier properties
Assignee: Kimberly Clark Worldwide Inc
•
Filing: 1992-11-16
•
Granted: 1993-12-21
•
Expires: 2012-11-16
Abstract
Abstract There is disclosed a nonwoven web for use as a barrier layer in an SMS fabric laminate. The web is formed at commercially acceptable polymer melt throughputs (greater than 3 PIH) by using a reactor granule polyolefin, preferably polypropylene, that has been modified by the addition of peroxide in amounts ranging from up to 3000 ppm to reduce the molecular weight distribution from an initial molecular weight distribution of from 4.0 to 4.5 Mw/Mn to a range of from 2.2 to 3.5 Mw/Mn. Also the addition of peroxide increases the melt flow rate (lowers viscosity) to a range between 800 up to 5000 gms/10 min at 230 DEG C. The resulting web has an average fiber size of from 1 to 3 microns and pore sizes distributed predominantly in the range from 7 to 12 microns, with a lesser amount of pores from 12 to 25 microns, with virtually no pores greater than 25 microns, and with the peak of the pore size distribution less than 10 microns.
Inventors
- 👤 Terry K. Timmons
- 👤 Peter Kobylivker
- 👤 Lin-Sun Woon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:02
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; D04H1/42; D04H1/4282; D04H1/4291; D04H1/542; D04H1/544; D04H1/559
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.2 and 3.5 Mw/Mn and a melt flow rate greater than 800 gms/10 min at 230° C.
Claim 2
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.2 and 3.5 Mw/Mn and a melt flow rate greater than 800 gms/10 min at 230° C.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein the polymer is throughput at a rate greater than 3 PIH.
Claim 4
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.8 and 3.5 Mw/Mn and a melt flow rate greater than 3000 gms/10 min at 230° C.
Claim 5
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.8 and 3.5 Mw/Mn and a melt flow rate greater than 3000 gms/10 min at 230° C.
Claim 6
Dependent Claim
28 words
The method of claim 3, wherein the modified polymer results from adding up to 500 ppm of peroxide to the reactor granules prior to forming the nonwoven web.
Claim 7
Dependent Claim
17 words
The method of claim 3 wherein the polymer is throughput at a rate greater than 3 PIH.
Claim 8
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.2 and 2.8 Mw/Mn and a melt flow rate greater than 800 gms/10 min at 230° C.
Claim 9
Independent Claim
53 words
A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the steps of melt-blowing a reactor granule of a modified polymer which polymer has a molecular weight distribution between 2.2 and 2.8 Mw/Mn and a melt flow rate greater than 800 gms/10 min at 230° C.
Claim 10
Dependent Claim
29 words
The method of claim 6, wherein the modified polymer results from adding from 500 to 3000 ppm of peroxide to the reactor granules prior to forming the nonwoven web.
Claim 11
Dependent Claim
16 words
The method of claim 6 wherein the polymer throughput at a rate greater than 3 PIH.
Claim 12
Dependent Claim
17 words
The method of claim 4 wherein the polymer is throughput at a rate greater than 3 PIG.
Claim 13
Dependent Claim
16 words
The method of claim 7 wherein the polymer throughput at a rate greater than 3 PIH.
References Cited (Backward Citations)
CA803714A
Cited
US3338992A
Cited
US3502763A
Cited
US3502538A
Cited
US3562804A
Cited
US3542615A
Cited
US3849241A
Cited
DE1902573A1
Cited
US3692618A
Cited
US3841953A
Cited
US3862265A
Cited
US3953655A
Cited
US4001172A
Cited
US4041203A
Cited
US3909009A
Cited
US3981957A
Cited
US4307143A
Cited
US4301029A
Cited
US4329252A
Cited
US4424138A
Cited
US4340563A
Cited
US4412025A
Cited
US4451589A
Cited
US4374888A
Cited
US4443513A
Cited
US4410649A
Cited
US4508859A
Cited
US4921920A
Cited
US4760113A
Cited
US4780438A
Cited
US4824885A
Cited
US4804577A
Cited
US4892852A
Cited
US5078925A
Cited
EP0316195A2
Cited
US4818799A
Cited
US4925601A
Cited
US4958006A
Cited
US4895897A
Cited
EP0370835A2
Cited
US4988781A
Cited
US5039431A
Cited
US5100435A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |