Condrapable hydrophobic nonwoven web and method of making same
AssigneeFirst Quality Nonwovens, Inc.
InventorsMichael Kauschke, Mordechai Turi, Horst Ring, Sabine Borst
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Abstract
A condrapable hydrophobic nonwoven web of continuous fibers includes a hydrophobic nonwoven web of continuous fibers, and a fiber surface-modifying agent on the web to form therewith a condrapable hydrophobic web. The agent is essentially an amino-modified polydimethylsiloxane. The condrapable hydrophobic web is characterized by a substantial hydrophobicity, as measured by a strike-through of over 180 seconds and by a substantial increase in condrapability, as measured by a Handle-O-Meter decrease of at least 15% average for MD and CD.
Claims60
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent consisting essentially of an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the agent being dispersed in the aqueous medium by a hydrophilic emulsifier.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the amino-modification being the substitution of an aminoalkyl group for a methyl group.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the wet pick-up of the web being 20 to 200%, based on the dry web.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the dried web having 0.005 to 0.5% agent thereon, based on the weight of the dried web.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the fibers being blends of polypropylene/polyethylene copolymer containing about 4% polyethylene.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the web having a bonding area of about 12-18% based on the total area of the web.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable hydrophobic web;
- the dried web being characterized by a substantial hydrophobicity, as measured by a strike-through of over 180 seconds, and by a substantial improvement in condrapability, as measured by a Handle-O-Meter decrease of at least 15% average for MD and CD relative to the initial condrapability.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium;
- and
- (C) drying the web to remove the aqueous medium and leave a dried web characterized by a substantial hydrophobicity, as measured by a strike-through of at least 180 seconds, and by a substantial improvement in condrapability, as measured by a Handle-O-Meter decrease of at least 15% average for MD and CD relative to the initial condrapability.
A method of making a condrapable nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a hydrophilic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium, the agent essentially comprising an amino-modified polydimethylsiloxane;
- and
- (C) drying the web to remove the aqueous medium and leave a condrapable web of reduced hydrophilicity.
A method of making a condrapable hydrophobic nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a non-hydrophobic nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium;
- and
- (C) drying the web to remove the aqueous medium and leave a dried web characterized by a substantial hydrophobicity, as measured by a strike-through of at least 180 seconds, and by a substantial improvement in condrapability, as measured by a Handle-O-Meter decrease of at least 15% average for MD and CD relative to the initial condrapability.
A method of making a condrapable nonwoven web of continuous fibers, comprising the steps of:
- (A) providing a nonwoven web of continuous fibers having an initial condrapability;
- (B) applying to the web a fiber surface-modifying agent dispersed in an aqueous medium;
- and
- (C) drying the web to remove the aqueous medium and leave a dried web characterized by a hydrophilicity, as measured by a strike-through of at least 10 seconds, and by a substantial improvement in condrapability, as measured by a Handle-O-Meter decrease of at least 15% average for MD and CD relative to the initial condrapability.
Dependencies are inferred from the claim text.