Disposable diaper and absorbent member used therein

• US 6,891,080 B2
• Filed: 05/23/2003
• Issued: 05/10/2005
• Est. Priority Date: 04/12/1999
• Status: Expired due to Term

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Masuki, Tetsuya, Yanagihara, Shigeto, Suzuki, Mikio, Ishiguro, Kenji, Minato, Masanori
• Primary Examiner(s): Schwartz, Larry I.
• Assistant Examiner(s): Bogart, Michael G.
• Application Number:
  US10/443,990
• Publication Number:
  US 20030208174A1
• Time in Patent Office: 718 Days
• Field of Search: 604/364, 604/367, 604/368, 604/374, 604/377, 604/378
• US Class Current: 604/368
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/531 having a homogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence
• CPC Class Codes: A61F 2013/530708 characterized by the absorbency properties
• CPC Class Codes: A61F 2013/530715 by the acquisition rate
• CPC Class Codes: A61F 2013/530722 by the delayed absorbency

Abstract

A disposable diaper is provided comprising a liquid permeable topsheet, a liquid impermeable backsheet, and a liquid retentive absorbent member interposed between the topsheet and the backsheet. The absorbent member comprises, in admixture, a superabsorbent polymer A having a rate of absorption of 8 g/30 sec/0.3 g or more measured by DW method and a superabsorbent polymer B having a rate of absorption of 5 g/30 sec/0.3 g or less measured by DW method at a polymer A/polymer B weight ratio of 90/10 to 10/90. The admixture optionally further comprises fluff pulp in an amount of from 0 to 30% by weight.

Claims

1. An absorbent member comprising, in admixture, a superabsorbent polymer A having a rate of absorption of 8 g/30 sec/0.3 g or more measured by Demand Wettability DW method and a superabsorbent polymer B having a rate of absorption of 0.5 g/30 sec/0.3 g to 5 g/30 sec/0.3 g measured by DW method at a polymer A/polymer B weight ratio of 90/10 to 10/90, said admixture optionally further comprising fluff pulp in an amount of from 0 to 30 % by weight.

2. An absorbent member according to claim 1, wherein the total content of the superabsorbent polymer A and the superabsorbent polymer B in said absorbent member is 50% by weight or more.

5. An absorbent article according to claim 2, wherein the total content of the superabsorbent polymer A and the superabsorbent polymer B in said absorbent member is 60 to 95% by weight.

3. A disposable diaper comprising a liquid permeable topsheet, a liquid impermeable backsheet, and a liquid retentive absorbent member interposed between the topsheet and said backsheet, wherein said absorbent member comprises, in admixture, a superabsorbent polymer A having a rate of absorption of 8 g/30 sec/0.3 g or more measured by Demand Wettability DW method and a superabsorbent polymer B having a rate of absorption of 0.5 g/30 sec/0.3 g to 5 g/30 sec/0.3 g measured by DW method at a polymer A/polymer B weight ratio of 90/10 to 10/90, said admixture optionally further comprising fluff pulp in an amount of from 0 to 30% by weight.

4. An absorbent article comprising a liquid permeable topsheet, a liquid impermeable backsheet, and a liquid retentive absorbent member interposed between said topsheet and said backsheet, wherein said absorbent member has a fluff pulp content of 0 to 30% by weight, and the ratio of the thickness of an unloaded absorbent article is at least 1.3 times the thickness of said absorbent article under a load of 180 gf/cm², and wherein said absorbent member comprises, in admixture, a superabsorbent polymer A having a rate of absorption of 8 g/30 sec/0.3 g or more measured by Demand Wettability DW method and a superabsorbent polymer B having a rate of absorption of 0.5 g/30 sec/0.3 g to 5 g/30 sec/0.3 g measured by DW method at a polymer A/polymer B weight ratio of 90/10 to 10/90.

6. An absorbent article according to claim 4, wherein the total content of the superabsorbent polymer A and the superabsorbent polymer B in said absorbent member is 60 to 95% by weight.