AU636487B2 - A nonwoven web with improved barrier properties - Google Patents

Description

S F Ref: 180281

AUSTRALIA

PATENTS ACT93 6 48 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

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@55 Name and Address of Applicant: Kimberly-Clark Corporation 401 North Lake Street Neenah Nisconsin 54956 UNITED STATES OF AMERICA Terry Kramer Timmons, Peter Lin-Sun Woon *Goo

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0 0 0 S Actual Inventor(s): Address for Service: Invention Title: Michalovich Kobylivker and Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia A Nonwoven Web with Improved Barrier Properties B S The following statement is a full descriptcn of this invention, including the best method of performing it known to me us:- 5845/3 A NONWOVEN WEB WITH IMPROVED BARRIER PROPERTIES Background of the Invention This invention relates generally to a nonwoven web having fine fibers and a small pore size distribution and a method for forming such a web. The method of the present invention uses a reactor granule resin having an initial broad 15 molecular weight distribution which resin has been modified •to narrow its molecular weight distribution and to increase its melt flow rate. Consequently the nonwoven web can be formed by melt-blowing at high throughputs. Such nonwoven webs are particularly useful as barrier layers for 20 fabric laminates.

Nonwoven fabric laminates are useful for a wide variety of applications. Such nonwoven fabric laminates are useful for wipers, towels, industrial garments, medical garments, medical drapes, and the like. Disposable fabric 25 laminates have achieved especially widespread use in hospital operating rooms for drapes, gowns, towels, footcovers, sterile wraps, and the like. Such surgical fabric laminates are generally spun-bonded/melt-blown/spun-bonded (SMS) laminates consisting of nonwoven outer layers of spun- 30 bonded polypropylene and an interior barrier layer of meltblown polypropylene. Particularly, Kimberly-Clark Corporation, the assignee of the present invention, has for a number of years manufactured and sold SMS nonwoven surgical fabric laminates under the marks Spunguard® and Evolution®. Such SMS fabric laminates have outside spunbonded layers which are durable and an internal melt-blown barrier layer which is porous but which inhibits the strikethrough of fluids from the outside of the fabric laminate to the inside. In order for such a surgical fabric to perform properly, it is necessary that the melt-blown barrier layer have a fiber size and a pore size distribution that assures breathability of the fabric while at the same time inhibiting strikethrough of fluids.

The current melt-blown web used in the manufacture of the Kimberly-Clark Evolution® medical fabric laminate has pore sizes distributed predominantly in the range from to 15 microns with the peak of the pore size distribution greater than 10 microns. While such a melt-blown web has advantages as a barrier layer, significant improvement in 15 porosity and inhibition of strikethrough can be achieved with a melt-blown web having average fiber sizes of from 1 to 3 S..i microns and having a distribution of pore sizes so that the majority of pores ar- in the range of 7 to 12 microns with the peak of the pore size distribution less than 10 microns. More 20 particularly, improved performance characteristics with respect to porosity and strikethrough can be achieved when the melt-blown web has pore sizes distributed predominantly in the range from 7 to 12 microns, with a lesser amount of pores from 12 to 25 microns, and with virtually no pores 25 greater than 25 microns as measure by the Coulter Porometer.

It is therefore an object of the present invention to provide a nonwoven web for use as a barrier layer in a fabric laminate which nonwoven web has an average fiber diameter 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 porcs greater than 25 microns, and with the peak of the pore size distribution less than 10 microns.

It is likewise an object of the present invention to provide a nonwoven fabric laminate having a barrier layer of fine fibers and small pore size distribution such that the resulting fabric laminate has pore sizes distributed predominantly in the range from 5 to 10 microns, with a lesser amount of pores from 10 to 15 microns, with virtually no pores greater than 22 microns, and with the peak of the pore size distribution shifted downward by up to 5 microns from the peak peak of the melt-blown web alone.

The foregoing objectives are preferably obtained by forming a melt-blown web from a resin having a broad molecular weight distribution and having a high melt flow rate which resin is modified by the addition of a small amount of peroxide prior to processing to achieve an even 15 higher melt flow rate (lower viscosity). In general, the present invention involves starting with a polymer in the form of reactor granules which polymer has a molecular weight distribution of 4.0 to 4.5 Mw/Mn and a melt flow rate of about 400 gms/10 min at 230 0 C. Such a molecular weight reactor granule polymer is then modified to reduce and narrow the polymer's molecular weight distribution to a range from 2.2 to 3.5 Mw/Mn by the addition of up to 3000 parts per million (ppm) of peroxide. During the meltblowing process, the modified reactor granule polymer has 25 an increased melt flow rate from 400 gms/10 min. to a range between 800 up to 5000 gms/10 min at 230°C.

Particularly, a polypropylene resin in the form of a reactor granule having a starting molecular weight distribution of 4.0 to 4.5 Mw/Mn and a melt flow rate of from 1000 to 3000 gms/lO0 min. at 230° C is combined with a small amount of peroxide, less than 500 ppm, to produce a modified polypropylene having a very high melt flow rate of up to 5000 gms/10 min. at 230° C and a narrower molecular weight distribution of 2.8 to 3.5 Mw/Mn.

Alternatively, an improved melt-blown web for use as a barrier layer can be formed by utilizing a resin, particularly polypropylene, having a narrow molecular weight distribution and having a lower melt flow rate which resin is modified by the addition of a larger amount of peroxide prior to melt-blowing to achieve a high melt flow rate. The starting reactor granule polypropylene resin has a molecular weight distribution between 4.0 and 4.5 Mw/Mn and a melt flow rate ranging from 300 to 1000 gms/10 min.

at 230 0 C. The polypropylene resin is modified by adding peroxide in amounts ranging from 500 to 3000 ppm to (the i*0*0 higher amounts of peroxide being used in connection with the lower initial melt flow rate). The modified *polypropylene resin has a melt flow rate up to about 3000 gms/10 min. at 230 0 C and a narrower molecular weight S" distribution of 2.2 to 2.8 Mw/Mn.

Most preferably, the starting polypropylene resin for the melt-blown web of the present invention is a polypropylene reactor granule which resin has a molecular weight distribution between 4.0 and 4.5 Mw/Mn, has a melt flow rate of about 2000 gms/10 min. at 230 0 C, and is treated with about 500 ppm of peroxide to produce a modified resin having a melt flow rate greater than 3000 gms/10 min. at 230 0 C and a molecular weight distribution of from 2.8 to Mw/Mn. The broader molecular weight distribution at the high melt flow rate helps minimize production of lint and polymer droplets.

Other objects and advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings.

Brief Description of the Drawings Figure 1 is a schematic diagram of a forming machine which is used in making the nonwoven fabric laminate including the melt-blown barrier layer of the present invention; Fig. 2 is a cross section view of the nonwoven fabric laminate of the present invention showing the layer configuration including the internal melt-blown barrier layer made in accordance with the present invention; Fig 3 is a graph showing the pore size distribution for a melt-blown web made in accordance with the present •invention (Sample an SMS fabric laminate incorporating .004. such a melt-blown web as a barrier layer (Sample a conventional melt-blown web (Sample and a conventional SMS fabric laminate (Sample 4).

Detailed Description of the Invention While the invention will be described in connection with a preferred embodiment, it will be understood that we do not intend to limit the invention to that embodiment. On the contrary, we intend to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.

Turning to Figure 1, there is shown schematically a e forming machine 10 which is used to produce an SMS fabric lamiilate 12 having a melt-blown barrier layer 32 in accordance with ihe present invention. Particularly, the forming machine 10 consists of an endless foraminous forming belt 14 wrapped around rollers 16 and 18 so that the belt 14 is driven in the direction shown by the arrows. The forming machine 10 has three stations, spun-bond station melt-blown station 22, and spun-bond station 24. It should be understood that more than three forming stations may be utilized to build up layers of higher basis weight.

Alternatively, each of the laminate layers may be formed separately, rolled, and later converted to the SMS fabric laminate off-line. In addition the fabric laminate 12 could be formed of more than or less than three layers depending on the requirements for the particular end use for the fabric laminate 12.

The spun-bond stations 20 and 24 are conventional extruders with spinnerettes which form continuous filaments of a polymer and deposit those filaments onto the forming belt 14 in a random interlaced fashion. The spun-bond stations 20 and 24 may include one or more spinnerette heads depending on the speed of the process and the particular polymer being used. Forming spun-bonded 15 material is conventional in the art, and the design of such a spun-bonded forming station is thought to be well within the else ability of those of ordinary skill in the art. The nonwoven spun-bonded webs 28 and 36 are prepared in conventional fashion such as illustrated by the following patents: Dorschner et al. United States Patent No 3,692,618; Kinney United States Patent Nos. 3,338,992 and 3,341,394; Levy United States Patent No. 3,502,538; Hartmann United States Patent Nos. 3,502,763 and 3,909,009; Dobo et al. United States ?atent No. 3,542,615; Harmon Canadian Patent No.

803,714; and Appel et al. United States Patent No.

4,340,563. Other methods for forming a nonwoven web

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having continuous filaments of a polymer are contemplated *:0I for use with the present invention.

Spun-bonded materials prepared with continuous filaments generally have at least three common features.

First, the polymer is continuously extruded through a spinnerette to form discrete filaments. Thereafter, the filaments are drawn either mechanically or pneumatically without breaking in order to molecularly orient the polymer filaments and achieve tenacity. Lastly, the continuous filaments are deposited in a substantially random manner onto a carrier belt to form a web. Particularly, the spunbond station 20 produces spun-bond filaments 26 from a fiber forming polymer. The filaments are randomly laid on the belt 14 to form a spun-bonded external layer 28. The fiber forming polymer is described in greater detail below.

The melt-blown station 22 consists of a die 31 which is used to form microfibers 30. The throughput of the die 31 is specified in pounds of polymer melt per inch of die width per hour (PIH). As the thermoplastic polymer exits the die 31, high pressure fluid, usually air, attenuates and spreads the polymer stream to form microfibers 30. The microfibers 30 are randomly deposited on top of the spunbond layer 28 and form a melt-blown layer 32. The 15 construction and operation of the melt-blown station 22 for forming microfibers 30 and melt-blown layer 32 is considered conventional, and the design and operation are well within the ability of those of ordinary skill in the art.

Such skill is demonstrated by NRL Report 4364, "Manufacture of Super-Fine Organic Fibers", by V.A.

Wendt, E.L. Boon, and C.D. Fluharty; NRL Report 5265, "An Improved Device for the Formation of Super-Fine Thermoplastic Fibers"', by K.D. Lawirnce, R.T. Lukas, and S* J.A. Young; and United States Patent No. 3,849,241, issued November 19, 1974, to Buntin et al. Other methods for forming a nonwoven web of microfibers are contemplated for use with the present invention.

The melt-blown station 22 produces fine fibers from a fiber forming polymer which will be described in greater detail below. The fibers 30 are randomly deposited on top of spun-bond layer 28 to form a melt-blown internal layer 32. For an SMS fabric laminate, for example, the melt-blown barrier layer 32 has a basis weight of preferably about 0.35-0.50 oz./yd.

2 8 After the internal layer 32 has been deposited by the melt-blown station 22 onto layer 28, spun-bond station 24 produces spun-bond filaments 34 which are deposited in random orientation on top of the melt-blown layer 32 to produce external spun-bond layer 36. For an SMS medical fabric laminate, for example, the layers 28 and 36 each have a basis weight of preferably from about 0.30 oz./yd.

2 to about 1.2 oz./yd.

2 The resulting SMS fabric laminate web 12 (Fig. 2) is then fed through bonding rolls 38 and 40. The surface of the bonding rolls 38 and 40 are provided with a raised pattern *6 such as spots or grids. The bonding rolls are heated to the softening temperature of the polymer used to form the layers ago.

of the web 12. As the web 12 passes between the heated bonding rolls 38 and 40, the material is compressed and heated by the bonding rolls in accordance with the pattern on the rolls to create a pattern of discrete areas, such as 41 shown in Fig. 2, which areas are bonded from layer to layer and are, bonded with respect to the particular filaments and/or fibers within each layer. Such discrete area or spot bonding is well known in the art and can be carried out as CS described by means of heated rolls or by means of ultrasonic heating of the web 12 to produced discrete area thermally bonded filaments, fibers, and layers. In accordance with conventional practice described in B rock et al., United States Patent No. 4,041,203, it is preferable for the fibers of the melt-blown layer in the fabric laminate to fuse within the 5:00 .bond areas while the filaments of the spun-bonded layers retain their integrity in order to achieve good strength characteristics.

In accordance with the present invention, we have found that the throughput (P1I) of the die head 22 may be increased while at the same time providing fine fibers by using a reactor granule form of the polymer rather than a pelletized form which polymer in reactor granular form has a molecular weight distribution of 4.0 to 4.5 Mw/Mn and a melt flow rate of about 400 gms/10 min at 230'C. Such a molecular weight reactor granule polymer is then modified to reduce the polymer's molecular weight distribution to a range from 2.2 to 3.5 Mw/Mln by the addition of up to 3000 ppm of peroxide. During the melt-blowing process, the modified reactor granule polymer has an increased melt flow rate from 400 gins/1 min. to a range from 800 up to 5000 gms/l0 min at 230'C. By modifying the starting polymer, the resulting polymer will have a lower extensional viscosity, thus taking less force to attenuate the fibers as they .5exit the die 3 1. Therefore, with the same air flow, the higher melt flow polymer will produce finer fibers at commercially acceptable throughputs. A commercially acceptable throughput is above 3 PIH. Lower throughputs, however, will further reduce the fiber and pore sizes of the melts ee blown layer 32.

The resulting melt-blown web 32 with its fine fibers and resulting small pore size distribution has superior barrier properties when incorporated into a fabric laminate.

Particularly, the unlamninated melt-blown web 32 has an average fiber size of from I to 3 microns and pore sizes distributed predominantly in the range from 7 to 12 se microns, with a lesser amount of pores from 12 to microns, with virtually no pores greater than 25 microns, 0:00 and with the peak of the pore size distribution less than *0006 microns.

When the melt-blown web 32 is incorporated into the SMS fabric laminate 12, the peak of the pore size distribution in the resulting SMS fabric laminate is shifted downward by up to 5 microns. The SMS fabric laminate 12 has pore sizes distributed predominantly in the range from 5 to microns, with a lesser amount of pores from 10 to microns, with virtually no pores greater than 22 microns, and with the peak of the pore size distribution shifted downward by up to 5 microns.

Figure 3 shows the pore size distribution for a meltblown web made in accordance with the present invention (Sample an SMS fabric la; inate made using the meltblown web of the present invention (Sample a conventional melt-blown web (Sample and an SMS fabric laminate such as Kimberly-Clark's Evolution® SMS medical fabric laminate made using the conventionlal melt-blown web (Sample Particularly, the melt-blown web of the present invention and the SMS fabric laminate of the present invention were made in accordance with Example 1 below.

6" The present invention can be carried out with S* polyolefins, including polypropylene, polyethylene, or other alphaolefins polymerized with Ziegler-Natta catalyst Sa* technology, and copolymers, terpolymers, or blends thereof.

Polypropylene is preferred.

Two methods can be used to achieve the high melt flow polymer which is useful in producing a nowoven web of fine fibers at commercial production speeds. The first and preferred method is to start with a reactor granule polypropylene resin having a molecular weight distribution between 4.0 and 4.5 Mw/Mn and a high melt flow rate of 1000 to 3000 gms/10 min. at 230 0 C. A small amount of peroxide is added to the starting resin to modify the molecular weight distribution to a range of 2.8 to Mw/Mn and to increase the melt flow rate up to 5000 min at 2300 C.

The second but less preferred method for producing nonwoven webs of fine fibers in accordance with the present invention is to start with a reactor granule resin having a molecular weight distribution between 4.0 and 4.5 Mw/Mn and a lower melt flow rate. By adding higher amounts of peroxide to the starting resin the melt flow rate is increased, and the molecular weight distribution is broadened. The 11 starting reactor granular polypropylene resin has a molecular weight distribution between 4.0 and 4.5 Mw/Mn and a melt flow rate ranging from 300 to 1000 gms/l0 min, at 230*C. The polypropylene resin is modified by adding peroxide in amounts ranging from 500 to 3000 ppn-, to (the higher amounts of peroxide being used in connection with the lower initial melt flow rate). The n' 'ied polypropylene resin has a melt flow rate up to about 3000 min. at 230'C and a narrower molecular weight distribution of 2.2 to 2.8 Mw/Mn. This second method produces a narrower molecular weight distribution between 2.2 and 2.8 Mw/Mn than the preferred method. and thus is likely to produce more lint and polymer droplets.

Example In order to illustrate the foregoing invention, a meltblown web was formed on a conventional melt-blowing forming line using the modified polymer of the present invention. In addition, an SMS fabric laminate was formed using the inventive melt-blown web as ail internal barrier layer. The SMS fabric laminate had spun bonded layers formed in conventional fashion of polypropylene, The SMS fabric laminate was preferably formed on-line by a multistation forming machine as illustrated 1.i Fig. I. The meltblown web and melt-blown barrier layer for the SMS fabric laminate were formed from reactor granules of S polypropylene having a starting molecular weight C distribution between 4.0 and 4.5 Mw/Mn and a melt flow rate of about 2000 gins/1 min. at 230'C. The starting polypropylene resin was treated with about 500 ppm of peroxide to produce a resin having a melt flow rate greater than 3000 gins/1O min. at 230*C and a molecular weight distribution of from 2.8 to 3.5 Mw/Mn. The broader molecular weight distribution at the high melt flow rate helps minimize production of lint and polymer droplets.

The melt-blown web, prepared in accordance with the foregoing, had a basis weight of 0.50 oz./yd.

2 and was designated as Sample 1. The SMS fabric laminate, having a melt-blown internal barrier layer made in accordance with the present invention, had spun-bonded layers with a, basis weight of 0.55 oz./yd.

2 and the melt-blown barrier layer had a basis weight of 0.50 oz./yd.

2 The inventive SMS fabric laminate was designated as Sample 2.

In addition, a conventional melt-blown web and a conventional SMS fabric laminate (Kimberly. Clark's Evolution® fabric laminate) having the same basis weights 0O S as the inventive web and inventive SMS fabric laminate were prepared as controls. The control melt-blown web was designated Sample 3, and the control SMS fabric laminate was designated Sample 4. The Samples 1 through 4 possess "se the characteristics set forth in Tables 1 and 2 below: Pore Size Distribution So p-s 5-IO 10-15i 15-20U *Sample 1 50.7 45.8 2.9 Sample 2 1.8 55.4 40.3 1.9 Sample 3 10.5 67.7 21.4 Sample 4 1.2 20.0 61.6 11.6 Maximum pore Sample 1 0.6 0 Sample 2 0.4 0 22.0g Sample 3 0.5 0.1 Sample 4 1.2 0.9 38.2 p The pore size distribution set out in Table 1 was measured by the Coulter Porometer. The pore size distribution set out in Table 1 is shown graphically in Fig. 3.

The plots shown in Fig. 3 show the finer pore size distribution for Samples 1 and 2 as compared to Samples 3 and 4 respectively. The pore size distribution for the inventive web and inventive SMS fabric laminate is narrower than the conventional melt-blown web and conventional SMS fabric laminate. It should be noted that the pore size distribution for the inventive SMS fabric laminate has the peak of its curve shifted downward by up to 5 microns from the peak of the melt-blown web alone before lamination. Apparently the lamination process and the 15 additional spunbonded layers cause the pore structure to close up thereby increasing the barrier properties of the resulting fabric laminate. The distribution of the pore sizes predominantly between 5 to 10 microns represents a fabric laminate (Sample 2) that is finer in its construction than conventional fabric laminates (Sample 4) with the resulting improved barrier properties.

The improved barrier properties of the inventive fabric laminate (Sample 2) as compared to the conventional fabric laminate (Sample 4) is shown in Table 2 below.

Table 2 Barrier Properties Blood Strikethrough t= 0 min. t= l min.

1 psi I psi Sample 2 2.5% 12.4% Sample 4 10.6% 14.5% Bacteria Filtration Efficiency Sample 2 95.4% Sample 4 91.9% The blood strike through was measured by the following procedure. A 7 in. by 9 in. piece of each sample fabric was laid on top of a similar sized piece of blotter paper. The blotter paper was supported on a water filled bladder which was in turn supported on a jack. The jack was equipped with a gauge to determine the force exerted from which the pressure exerted by the bladder on the blotter ":II paper was calculated. A 1.4 gm sample of bovine blood was placed on top of the fabric sample and covered with a piece of plastic film. A stationary plate was located above the plastic film. The water bladder was then jacked up until a pressure of 1 psi was attained on the bottom of the blotter paper. As soon as the pressure was achieved, that pressure was held for the desired time. Once the time had elapsed, the pressure was released, and the blotter paper was removed and weighed. Based on the difference in weight of the blotter paper before and after, the percentage strike through was determined.

The test results indicate that the SMS fabric laminate made in accordance with the present invention has superior strike through characteristics especially for short elapsed times. Short elapsed times represent the situations that are most often encountered in medical use where blood generally will not remain for long on the drape or gown before it can run off.

The filter properties were measured to determine the ability of the SMS fabric laminate to block the penetration of air born bacteria. The samples were tested in accordance with Mil. Spec. 36954-C 4.4.1.1.1 and 4.4.1.2.

The 3.5% increase in efficiency within the plus range represents a significant improvement in filtration and the ability to preclude the passage of air born bacteria.

see a 0.

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Claims (16)

1. A nonwoven web of fine fibers formed from 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 2300 C.

2. The nonwoven web of claim 1, wherein the web is formed at a polymer throughput of greater than 3 PIH.

3. The nonwoven web of claim 1, wherein the web has an average fiber size from 1 to 3 microns and pore sizes distributed predominantly in the range from 7 to 12 microns 15 with the peak of the pore size distribution less than 'microns. 0

4. A nonwoven web formed from 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 2300 C. The nonwoven web of claim 4, wherein the modified polymer results from adding up to 500 ppm of peroxide to the reactor granules prior to forming the web.

6. The nonwoven web of claim 4 or 5, wherein the web is formed at a polymer throughput of greater than 3 PIH.

7. The nonwoven web of claim 4 or 5, wherein the web has an average fiber size from 1 to 3 microns and pore sizes distributed predominantly in the range from 7 to 12 microns with the peak of the pore size distribution less than 10 microns. -17-

8. A nonwoven web formed from 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 2300 C.

9. The nonwoven web of claim 8, wherein the modified polymer results from adding from 500 to 3000 ppm of peroxide to the reactor granules prior to forming the web. S*

10. The nonwoven web of claim 8 or 9, wherein the web is formed at a polymer throughput of greater than 3 PIH.

11. The nonwoven web of claim 8 or 9, wherein the web has an average fiber size from 1 to 3 microns and pore sizes distributed predominantly in the range from 7 to 12 mnicrons with the peak of the pore size distribution less than 10 microns. a 4 I*

12. A method of forming a nonwoven web having fine fibers and a small pore size distribution comprising the r" "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 2300 C.

13. The method of claim 12, wherein the polymer is throughput at a rate greater than 3 PIH. -18- 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 2300 C. The method of claim 14, wherein the modified polymer results from adding up to 500 ppm of peroxide to the reactor granules prior to forming the nonwoven web.

16. The method of claim 14 or 15, wherein the polymer is throughput at a rate greater than 3 PIH. 15 17. 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 S0" between 2.2 and 2.8 Mw/Mn and a melt flow rate greater 20 than 800 gms/10 min at 230° C.

18. The method of claim 17, wherein the modified polymer results from adding from 500 to 3000 ppm of peroxide to the reactor granules prior to forming the 25 nonwoven web.

19. The method of claim 17 or 18, wherein the polymer is throughput at a rate greater than 3 PIH. A nonwoven web of fine fibers formed from a reactor granule of a modified polymer substantially as hereinbefore S" 30 described with reference to the accompanying drawings.

21. A method of forming a nonwoven web having fine fibers and a small pore size distribution substantially as hereinbefore described with reference to the accompanying drawings. DATED this SECOND day of MAY 1991 Kimberly-Clark Corporation Patent Attorneys for the Applicant SPRUSON FERGUSON A NONWOVEN WEB WITH IMPROVED BARRIER PROPERTIES Abstract of the Disclosure There is disclosed a nonwoven web for use as a barrier layer (32) 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 ;ne addition of peroxide increases the melt flow rate (lowers viscosity) to a range between 800 up to 5000 gms/10 min at 230°C. The resulting 15 web (32) has an average fiber size of from 1 to 3 microns and pore sizes distributed predominantly in the range from 7 to S*e 12 microns, with a lesser amount of pores from 12 to microns, with virtually no pores greater than 25 microns, and with the peak of the pore size distribution less than microns. f (Figure 2) GSA/5823W GSA/5823W