D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/636.2
D01F 8/04 (2006.01) D04H 1/54 (2006.01)
Patent
CA 1329456
ABSTRACT OF THE DISCLOSURE This invention relates to bicomponent melt-bondable fibers, more particularly, such fibers suitable for use in nonwoven webs. Bicomponent fibers are known to suffer from excessive thermal shrinkage. In web bonding, high shrinkage results in nonwovens uneven in density and lacking in uniformity of width and thickness. Buffing pads made of nonwoven fibers must be sufficiently uniform so that they do not mar the smooth finish of a floor when used thereon. Because excessive thermal shrinkage causes curling and agglomerating of the fibers in the pad, fine abrasive particles that are typically added to the pad tend to become concentrated at the points where the fibers agglomerate, i.e., the junction points thereof. This non-uniformity of abrasive distribution generally results in marring of floors during the cleaning and buffing thereof. The present invention provides melt-bondable, bicomponent fibers suitable for use in nonwoven articles, said fibers having as a first component a polymer capable of forming fibers and as a second component a compatible blend of polymers capable of adhering to the surface of the first component. The second component has a melting temperature at least 30°C below the melting temperature of the first component, but at least about 130°C. The blend of polymers of the second component comprises a compatible mixture of at least a partially crystalline polymer and an amorphous polymer. The fibers made according to this invention allow nonwoven webs prepared from these fibers to have a reduced level of shrinkage under conventional processing conditions. Accompanying this reduction in shrinkage is a reduction in curling or agglomerating of the individual bicomponent fibers, thereby providing a nonwoven web that will not mar smooth surfaces.
595854
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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