Abstract A soft, nonwoven web is produced by adding directly to a thermoplastic polymer at the time of extrusion a lubricating agent having an HLB number in the range of 8 to 20 and a molecular weight in the range of from 200 to 4000. The lubricating agent is uniformly distributed into the polymer as extruded into filaments. The filaments are collected to form a web and then subjected to heat treatment in the range of from 180°-260°F. for at least about 1-7 seconds. The lubricating agent migrates to the surface of the fibers producing a release effect and preventing secondary bonding from occurring. After pattern bonding to provide spaced areas of high intensity bonds, the result is a soft, strong nonwoven web having particular utility as a liner for disposable diapers and catamenial devices.
A soft, nonwoven web comprising a sheet of intermingled, thermoplastic filaments having on the surfaces thereof 0.05 to 1.0% of a semi-compatible lubricating agent having a molecular weight in the range of from about 200 to about 4000 and an HLB number in the range of from about 8 to about 20; said sheet having spaced areas of high bond intensity separated by areas of low bond intensity.
Claim 2
Dependent Claim
68 words
A soft, nonwoven web comprising a sheet of intermingled, thermoplastic filaments having on the surfaces thereof 0.05 to 1.0% of a semi-compatible lubricating agent having a molecular weight in the range of from about 200 to about 4000 and an HLB number in the range of from about 8 to about 20; said sheet having spaced areas of high bond intensity separated by areas of low bond intensity.
Claim 3
Dependent Claim
13 words
The web of claim 1 wherein said filaments are formed predominantly of polypropylene.