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US 7,491,770 B2Granted
Fibers and nonwovens comprising polypropylene blends and mixtures
AssigneeThe Procter & Gamble Company
InventorsJean-Phillipe Marie Autran, Kelyn Anne Arora
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Abstract
Fibers and nonwoven materials comprising polymeric blends and polymeric mixtures that incorporate a blend of a first metallocene polypropylene and a second polypropylene are described. The first and second polypropylenes have a predetermined relationship for the melt temperature and the melt flow rate of the individual polypropylenes. Also described are fibers (including bicomponent fibers) and nonwoven materials made from the fibers where the fibers are extruded using the polymeric blends, and/or the polymeric mixtures.
Claims12
An extensible nonwoven material comprising:
- a plurality of fibers, the fibers including a polymeric blend, wherein the polymeric blend comprises
- (a) a first metallocene polypropylene having an average melt temperature TM1 and a melt flow rate MFR1;
- and
- (b) a second polypropylene having an average melt temperature TM2 and a melt flow rate MFR2;
- wherein the weight ratio of the first metallocene polypropylene to the second polypropylene is from about 1:4 to about 4:1 and wherein the polymeric blend has an average melt temperature TMb of from about 125° C. to about 160° C., a melt flow rate MFRb of from about 15 g/10 minutes to about 35 g/10 minutes wherein:
- TM1<TMb<TM2,
- MFR1<MFRb<MFR2, and
- MFR2/MFR1≧2.0.
5 more elements
Dependencies are inferred from the claim text.