Absorbent article and method for making an absorbent article

Absorbent article comprising:

• a liquid permeable topsheet,
• a liquid impermeable backsheet,
• an absorbent core, and
• an acquisition and distribution system comprising an acquisition and/or distribution layer comprising less than 80% by weight of cellulose fibers and modified cellulose fibers;
• wherein the absorbent core is provided between the topsheet and the backsheet;
• the acquisition and distribution system is provided between the topsheet and the absorbent core;
• wherein the acquisition and/or distribution layer comprises one or more saturated carboxylic acids, wherein the one or more saturated carboxylic acids are each selected from the group of monocarboxylic acids, dicarboxylic acids or tricarboxylic acids;
• wherein the one or more saturated carboxylic acids each have a pKa for the first acid dissociation in water at 25° C. and 1 atm and the pKa of each of the one or more saturated carboxylic acids is from 2.5 to 5.0;
• wherein the one or more saturated carboxylic acids each are in monomeric, dimeric or oligomeric form;
• and
• wherein the acquisition and/or distribution layer exhibits a Neutralization Area Value of from 0.35 mmol/m2 to 100.00 mmol/m2, preferably from 0.50 mmol/m2 to 750.00 mmol/m2, more preferably from 1.00 mmol/m2 to 50.00 mmol/m2, even more preferably from 10.00 mmol/m2 to 35.00 mmol/m2 or even from 15.00 mmol/m2 to 25.00 mmol/m2 according to the Neutralization Area Value test method disclosed herein.

Absorbent article comprising:

• a liquid permeable topsheet,
• a liquid impermeable backsheet,
• an absorbent core, and
• an acquisition and distribution system comprising at least one acquisition and/or distribution layer;
• wherein the absorbent core is provided between the topsheet and the backsheet;
• the acquisition and distribution system is provided between the topsheet and the absorbent core;
• wherein the acquisition and distribution system comprises one or more saturated carboxylic acids, wherein the one or more saturated carboxylic acids are each selected from the group of monocarboxylic acids, dicarboxylic acids or tricarboxylic acids;
• wherein the one or more saturated carboxylic acids each have a pKa for the first acid dissociation in water at 25° C. and 1 atm and the pKa of each of the one or more saturated carboxylic acids is from 2.5 to 5.0;
• wherein the one or more saturated carboxylic acids each are in monomeric, dimeric or oligomeric form;
• and
• wherein the absorbent article exhibits a Neutralization Value of from 0.015 mmol to 1.500 mmol, preferably from 0.025 mmol to 1.000 mmol, more preferably from 0.050 mmol to 0.900 mmol, even more preferably from 0.100 mmol to 0.800 mmol or even from 0.500 mmol to 0.750 mmol according to the Neutralization Value test method disclosed herein.

Absorbent article comprising:

• a liquid permeable topsheet,
• a liquid impermeable backsheet,
• an absorbent core, and
• an acquisition and distribution system comprising at least one acquisition and/or distribution layer;
• wherein the absorbent core is provided between the topsheet and the backsheet;
• the acquisition and distribution system is provided between the topsheet and the absorbent core;
• wherein the acquisition and distribution system comprises one or more saturated carboxylic acids, wherein the one or more saturated carboxylic acids are each selected from the group of monocarboxylic acids, dicarboxylic acids or tricarboxylic acids;
• wherein the one or more saturated carboxylic acids each have a pKa for the first acid dissociation in water at 25° C. and 1 atm and the pKa of each of the one or more saturated carboxylic acids is from 2.5 to 5.0;
• wherein the one or more saturated carboxylic acids each are in monomeric, dimeric or oligomeric form;
• and
• wherein the absorbent article exhibits a Total Neutralization Value of from 0.150 mmol to 1.525 mmol, preferably from 0.200 mmol to 1.250 mmol, more preferably from 0.250 mmol to 1.050 mmol, even more preferably from 0.300 mmol to 0.900 mmol or even from 0.600 mmol to 0.800 mmol according to the Total Neutralization Value test method disclosed herein.

A process for making an absorbent article comprising:

• a liquid permeable topsheet,
• a liquid impermeable backsheet,
• an absorbent core, and
• an acquisition and distribution system comprising at least one acquisition and/or distribution layer;
• wherein the absorbent core is provided between the topsheet and the backsheet;
• the acquisition and distribution system is provided between the topsheet and the absorbent core;
• wherein the process comprises the step of
• a) applying one or more saturated carboxylic acids to the acquisition and distribution system, wherein the one or more saturated carboxylic acids are each selected from the group of monocarboxylic acids, dicarboxylic acids or tricarboxylic acids;
• wherein the one or more saturated carboxylic acids each have a pKa for the first acid dissociation in water at 25° C. and 1 atm and the pKa of each of the one or more saturated carboxylic acids is from 2.5 to 5.0;
• wherein the one or more saturated carboxylic acids each are in monomeric, dimeric or oligomeric form;
• and
• wherein wherein at least one of the one or more saturated carboxylic acids is applied to the acquisition and distribution system in an amount from Mmin to Mmax,
• wherein Mmin is calculated according to Formula A and Mmax is calculated according to Formula B:
• M
• min
• =
• 10
• pK
• a
• -
• 9.
• ⁢
• mol
• +
• 10
• -
• 5.
• ⁢
• mol
• Formula
• ⁢
• A
• M
• max
• =
• 10
• pK
• a
• -
• 6.5
• ⁢
• mol
• +
• 10
• -
• 3.75
• ⁢
• mol
• .
• Formula
• ⁢
• B