Absorbent articles comprising hydrophilic nonwoven fabrics
First Claim
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1. An absorbent article comprising a substantially liquid pervious topsheet, a substantially liquid impervious backsheet and an absorbent core between said topsheet and said backsheet, wherein said topsheet comprises a nonwoven fabric, wherein said nonwoven fabric comprisesa plurality of fibers;
- hydrophilic polymers chemically grafted to the surface of at least a part of said plurality of fibers, said hydrophilic polymers being chemically grafted to said fibers by way of reactive radicals formed from at least one of (i) a reaction between a monomer molecule and a radical polymerization initiator molecule and (ii) a reaction between the fiber surface and a radical polymerization initiator molecule, the amount of radical polymerization initiator molecules being less than 2 wt % of the monomer molecules; and
agent molecules, the amount of radical polymerization initiator molecules being at least three times the amount of the agent molecules by weight,wherein said nonwoven has a liquid strike through time of less than 5 s for a fifth gush of liquid and wherein said nonwoven provides a surface tension measurement of at least 65 mN/m according to the Determination of Surface Tension method.
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Abstract
The present invention relates to absorbent articles comprising nonwoven fabrics, which are made hydrophilic by polymers chemically bonded to the surface of the nonwoven fabrics.
Moreover, the invention relates to a process for making hydrophilic fibers, which can be formed into a nonwoven fabric.
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Citations
18 Claims
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1. An absorbent article comprising a substantially liquid pervious topsheet, a substantially liquid impervious backsheet and an absorbent core between said topsheet and said backsheet, wherein said topsheet comprises a nonwoven fabric, wherein said nonwoven fabric comprises
a plurality of fibers; -
hydrophilic polymers chemically grafted to the surface of at least a part of said plurality of fibers, said hydrophilic polymers being chemically grafted to said fibers by way of reactive radicals formed from at least one of (i) a reaction between a monomer molecule and a radical polymerization initiator molecule and (ii) a reaction between the fiber surface and a radical polymerization initiator molecule, the amount of radical polymerization initiator molecules being less than 2 wt % of the monomer molecules; and agent molecules, the amount of radical polymerization initiator molecules being at least three times the amount of the agent molecules by weight, wherein said nonwoven has a liquid strike through time of less than 5 s for a fifth gush of liquid and wherein said nonwoven provides a surface tension measurement of at least 65 mN/m according to the Determination of Surface Tension method. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An absorbent article comprising a substantially liquid pervious topsheet, a substantially liquid impervious backsheet and an absorbent core between said topsheet and said backsheet, wherein said absorbent core is provided with a nonwoven core wrap material, said nonwoven core wrap material comprising
a plurality of fibers; -
hydrophilic polymers chemically grafted to the surface of at least a part of said plurality of fibers, said hydrophilic polymers being chemically grafted to said fibers by way of reactive radicals formed from at least one of (i) a reaction between a monomer molecule and a radical polymerization initiator molecule and (ii) a reaction between the fiber surface and a radical polymerization initiator molecule, the amount of radical polymerization initiator molecules being less than 2 wt % of the monomer molecules; and agent molecules, the amount of radical polymerization initiator molecules being at least three times the amount of the agent molecules by weight, wherein said nonwoven has a liquid strike through time of less than 5 s for a fifth gush of liquid and wherein said nonwoven provides a surface tension measurement of at least 65 mN/m according to the Determination of Surface Tension method. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification