Claims
- 1. A method of making a shaped and crosslinked article, the method of comprising the steps of:a. Shaping the article from a composition comprising (i) at least one homogeneously branched ethylene interpolymer that has a density of less than or equal to about 0.90 g/cc, and (ii) a nitrogen-containing stabilizer; and b. Crosslinking the article such that the article does not adhere to a polyester film upon deflection of the film from the article by more than 30 degrees, the adhesion of the article to the polyester film determined after the article has been washed for thirty minutes in an aqueous solution of 0.5 weight percent detergent, the solution maintained at 160° F., followed by ten hours of contact with the polyester film in a circulating air oven maintained at a temperature of 133° C., wherein the at least one homogeneously branched ethylene interpolymer is a substantially linear ethylene interpolymer characterized as having(a) melt flow ratio, I10/I2≧5.63, (b) a molecular weight distribution, Mw/Mn, as determined by gel permeation chromatography and defined by the equation: (Mw/Mn)≦(I10/I2)−4.63, (c) a gas extrusion rheology such that the critical shear rate at onset of surface melt fracture for the substantially linear ethylene polymer is at least 50 percent greater than the critical shear rate at the onset of surface melt fracture for a linear ethylene polymer, wherein the substantially linear ethylene polymer and the linear ethylene polymer comprise the same comonomers or comonomers, the linear ethylene polymer has an I2 and Mw/Mn within ten percent of the substantially linear ethylene polymer and wherein the respective critical shear rates of the substantially linear ethylene polymer and the linear ethylene polymer are measured at the same melt temperature using a gas extrusion rheometer, and (d) a single differential scanning calorimetry, DSC, melting peak between −30° and 150° C., and wherein at least one nitrogen-containing stabilizer is selected from the group consisting of a hydroquinoline, diphenylamine and substituted piperidine.
- 2. The method of claim 1 in which the composition further comprises at least one pro-rad additive.
- 3. The method of claim 1 in which the ethylene interpolymer is grafted with a silane crosslinker.
- 4. The method of claim 3 in which the article is crosslinked upon exposure to ionizing radiation.
- 5. The method of claim 4, wherein the ionizing radiation is provided by electron beam irradiation.
- 6. The method of claim 1, wherein the article is fabricated using a technique selected from the group consisting of fiber melt spinning, fiber melt blowing, spunbonding, spunlacing, carding, film blowing, cast film, injection molding, pultrusion, thermoforming, stamping, forging, blow molding, sheet extrusion, solvent casting, solvent coating, thermal lamination, calendering, roll milling, reaction injection molding, extrusion coating, dispersion coating, and rotomolding.
- 7. The method of claim 1, wherein the homogeneously branched ethylene interpolymer is a homogeneously branched linear ethylene polymer.
- 8. The method of claim 7, wherein the homogeneously branched linear ethylene interpolymer is characterized as having a single differential scanning calorimetry, DSC, melting peak between −30° and 150° C.
- 9. The method of claim 1, wherein the homogeneously branched ethylene interpolymer is blended with another synthetic or natural polymer.
- 10. The method of claim 9, wherein the synthetic or natural polymer is an olefin polymer.
- 11. The method of claim 9, wherein the synthetic or natural polymer is a crystalline polyethylene having a density at 23° C. greater than or equal to 20 weight percent as determined using differential scanning calorimetry.
- 12. The method of claim 11, wherein the crystalline polyethylene has a density at 23° C. greater than or equal to 50 weight percent as determined using differential scanning calorimetry.
- 13. The method of claim 9, wherein the synthetic or natural polymer is a polypropylene.
- 14. The method of claim 13, wherein the polypropylene is an isotactic polypropylene polymer.
- 15. The method of claim 1, wherein the homogeneously branched ethylene interpolymer comprises ethylene interpolymerized with at least α-olefin.
- 16. The method of claim 15, wherein the α-olefin is a C3-C20 α-olefin.
- 17. The method of claim 1, wherein the homogeneously branched ethylene interpolymer comprises ethylene interpolymerized with propylene.
- 18. The method of claim 1 wherein the ethylene interpolymer comprises ethylene interpolymerized with a styrenic compound.
- 19. The method of claim 18, wherein the styrenic compound is styrene and the interpolymer is an ethylene-styrene interpolymer.
- 20. The method of claims 19, wherein the ethylene-styrene interpolymer comprises from about 0.5 to about 65 mole percent styrene, as determined using proton nuclear magnetic resonance analysis wherein(a) sample preparation is in 1,1,2,2-tetrachloroethane-d2 (TCE-d2) and (b) spectra are accumulated on a Varian VXR 300 unit with the sample probe at 80° C. and referenced to the residual protons of TCE-d2 at 5.99 ppm.
- 21. The shaped interpolymer of claim 1 in the form of a woven or nonwoven fabric.
- 22. A personal hygiene item comprising the shaped interpolymer of claim 1.
- 23. The item of claim 22 wherein the item is a disposable diaper.
- 24. The item of claim 23 wherein the diaper comprises a backsheet or a topsheet comprised of the shaped interpolymer.
- 25. An infection control item comprising the shaped interpolymer of claim 1.
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority benefit of US provisional application No. 60/0875536, filed Jun. 1, 1998, the disclosure of which is incorporated herein by reference, in its entirety.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
5272236 |
Lai et al. |
Dec 1993 |
A |
5324576 |
Reed et al. |
Jun 1994 |
A |
5451450 |
Erderly et al. |
Sep 1995 |
A |
5472775 |
Obijeski et al. |
Dec 1995 |
A |
Foreign Referenced Citations (6)
Number |
Date |
Country |
0 346 862 |
Dec 1989 |
EP |
9425648 |
Nov 1994 |
WO |
9631568 |
Oct 1996 |
WO |
9712919 |
Apr 1997 |
WO |
9820065 |
May 1998 |
WO |
9826001 |
Jun 1998 |
WO |
Non-Patent Literature Citations (1)
Entry |
International Search Report dated Sep. 2, 1999 issued by the EPO acting as the International Searching Autority in PCT/US99/11745. |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/087536 |
Jun 1998 |
US |