Absorbent articles with dual-layered cores

A disposable diaper article comprising

• (A) a liquid-impervious, elongated backing sheet;
• (B) a relatively hydrophobic, liquid pervious topsheet;
• (C) a layered absorbent core positioned between said backing sheet and said topsheet, said absorbent core comprising;
• (i) an elongated upper fluid acquisition/distribution layer having a density of from about 0.07 to 0.14 g/cm.sup.3, consisting essentially of hydrophilic fiber material, and being substantially free of hydrogel material;
• and
• (ii) a lower fluid storage layer having a density of from about 0.09 to 0.18 g/cm.sup.3 and consisting essentially of an intimate admixture of hydrophilic fiber material and from about 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material;
• said lower fluid storage layer having a top surface area which is from about 0.25 to 0.75 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said backing sheet and said upper fluid acquisition/distribution layer in a manner such that at least about 90% of the hydrogel material in said lower layer is found within the front two-thirds section of said diaper article and such that at least about 60% of the hydrogel material in said lower layer is found within the front half section of said diaper article.

A disposable diaper article comprising

• (A) a liquid-impervious, elongated backing sheet;
• (B) a relatively hydrophobic, liquid pervious topsheet;
• and
• (C) a layered absorbent core positioned between said backing sheet and said topsheet, said absorbent core comprising:
• (i) an elongated upper fluid acquisition/distribution layer having a density of from about 0.07 to 0.14 g/cm.sup.3, and consisting essentially of hydrophilic fiber material and up to about 6% by weight of said upper layer of particles of substantially water-insoluble hydrogel material;
• and
• (ii) a lower fluid storage layer having a density of from about 0.09 to 0.18 g/cm.sup.3 and consisting essentially of an intimate admixture of hydrophilic fiber material and from about 15% to 40% by weight of said lower layer of particles of substantially water-insoluble hydrogel material;
• lower fluid storage layer having a top surface area which is from about 0.25 to 0.75 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said backing sheet and said upper fluid acquisition/distribution layer in a manner such that at least about 90% of the hydrogel material in said lower layer is found within the front two-thirds section of said diaper article and such that at least about 60% of the hydrogel material in said lower layer is found within the front half section of said diaper article.

A disposable diaper article comprising

• (A) a liquid-impervious, elongated backing sheet;
• (B) a relatively hydrophobic, liquid pervious topsheet;
• (C) a layered absorbent core positioned between said backing sheet and said topsheet, said absorbent core comprising;
• (i) an elongated upper fluid acquisition/distribution layer having a density of from about 0.07 to 0.14 g/cm.sup.2 and consisting essentially of hydrophilic fiber material and from 0% to about 6% by weight of said upper layer of particles of substantially water-insoluble hydrogel material;
• and
• (ii) a lower fluid storage layer having a density of from about 0.06 to 0.3 g/cm.sup.3 and consisting essentially of a laminate of at least two layers of dispersed particles of substantially water-in-soluble hydrogel material separated by and overwrapped with sheets of tissue, said hydrogel particles comprising from about 9% to 60% by weight of said lower layer;
• said lower fluid storage layer having a top surface area which is from about 0.25 to 0.75 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said backing sheet and said upper fluid acquisition/distribution layer in a manner such that at least about 90% of the hydrogel material in said lower layer is found within the front two-thirds section of said diaper article and such that at least about 60% of the hydrogel material in said lower layer is found within the front half section of said diaper article.

A disposable, dual-layer absorbent core suitable for use in an absorbent article, said absorbent core comprising

• (A) an elongated upper fluid acquisition/distribution layer having a density of from about 0.05 to 0.25 g/cm.sup.3 and consisting essentially of hydrophilic fiber material and from 0% to about 8% by weight of said upper layer of particles of substantially water-insoluble hydrogel material;
• and
• (B) a lower fluid storage layer having a density of from about 0.06 to 0.3 g/cm.sup.3 and consisting essentially of a substantially uniform combination of hydrophilic fiber material and from about 9% to 60% by weight of said lower layer of particles of substantially water-insoluble hydrogel material;
• said lower fluid storage layer having a top surface area which is from about 0.25 to 1.0 times that of said upper fluid acquisition/distribution layer and said lower fluid storage layer further being positioned relative to said upper layer in a manner such that at least about 75% of the hydrogel material in said lower layer is found within the front two-thirds section of said absorbent core and such that at least about 55% of the hydrogel material in said lower layer is found within the front half of said absorbent core.