Body fluid-adsorbing article

• US 4,959,060 A
• Filed: 12/12/1989
• Issued: 09/25/1990
• Est. Priority Date: 11/17/1986
• Status: Expired due to Term

• Current Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.
• Original Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.
• Inventors: Ishizaki, Kunihiko, Harada, Nobuyuki, Shimomura, Tadao
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/449,456
• Time in Patent Office: 287 Days
• Field of Search: 604/368, 604/358, 604/365, 604/366, 604/367, 604/369, 604/370, 604/374
• US Class Current: 604/368
• CPC Class Codes: A61L 15/20 containing organic materials
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents

Abstract

A body fluid-absorbing article such as, for example, a disposable diaper is provided with at least one absorbent member comprising 50 to 99% by weight of a fibrous material and 50 to 1% by weight of an absorbent polymer, which absorbent member contains at least one compound (A) selected from the group consisting of sulfur-containing reducing agents, antioxidants, and oxidizing agents. By the action of the compound (A), the swelled gel of the absorbent polymer formed in consequence of absorption of body fluid is prevented from being deteriorated or decomposed by aging.

Claims

1. A body fluid-absorbing article comprising at least one absorbent member which forms a swelled gel when a body fluid is absorbed, comprising 50 to 99% by weight of a fibrous material and 50 to 1% by weight of an absorbent polymer, wherein said absorbent polymer is at least one member selected from the group consisting of hydrolyzed starch-acrylonitrile graft polymer, partially neutralized starch-acrylic acid graft polymer, saponified vinyl acetate-acrylic ester copolymer, hydrolyzed acrylonitrile copolymers, cross-linked hydrolyzed acrylonitrile copolymers, hydrolyzed acrylamide copolymers, cross-linked hydrolyzed acrylamide copolymers, partially neutralized polyarcylic acid, cross-linked partially neutralized polyacrylic acid, and isobutylene-maleic anhydride copolymer, said absorbent member containing at least one species compound (A) selected from the group consisting of sulfur-containing reducing agents, antioxidants, and oxidizing agents, wherein said sulfur-containing reducing agent is at least one member selected from the group consisting of thiosulfates, sulfurous acid, sulfites, hydrogen sulfites dithionites, hydrosulfides, and mercaptans, and said compound (A) being present in a physical mixture with said absorbent polymer in an amount capable of preventing the swelled gel of the absorbent polymer from being deteriorated or decomposed with an elapse of time.

2. An article according to claim 1, wherein said compound (A) is contained in said absorbent member in a ratio falling in the range of 0.05 to 20 parts by weight, based on 100 parts by weight of said absorbent polymer.

3. An article according to claim 1, wherein said compound (A) contains a sulfur-containing reducing agent as an essential component.

4. An article according to claim 3, wherein said compound (A) is a sulfur-containing reducing agent.

5. An article according to claim 4, wherein said sulfur-containing reducing agent is at least one member selected from the group consisting of thiosulfates, sulfites, hydrogen sulfites, and mercaptans.

6. An article according to claim 1, wherein said 25 fibrous material is a cellulosic fiber material.

7. An article according to claim 1, wherein said absorbent polymer is a cross-linked partially neutralized polyacrylic acid.

8. An article according to claim 1, wherein said absorbent polymer and said compound (A) are in the form of a powder mixture interposed between at least two sheets of said fibrous material after the pattern of a sandwich.

9. An article according to claim 1, wherein said absorbent member is an air-molded mixture of said absorbent polymer with said compound (A) in the form of a powder and said fibrous material in the form of short-staple fibers, said absorbent member being in the form of a sheet.

10. An article according to claim 1, wherein said absorbent member is a composite having said compound (A) deposited on said absorbent polymer, said composite being interposed between at least two sheets of said fibrous material after the pattern of a sandwich.

11. An article according to claim 1, wherein said absorbent member is an air molded mixture of a composite having said compound (A) deposited on said absorbent polymer and said fibrous material in the form of short-staple fibers, the air molded mixture being in the form of a sheet containing said compound (A) in a uniformly distributed state.

12. An article according to claim 1, wherein said absorbent member comprises at least two sheets of said fibrous material having said compound (A) deposited on said sheets, said absorbent polymer being interposed between said two sheets after the pattern of a sandwich.

13. An article according to claim 1, wherein said absorbent member is an air molded mixture of a composite having said compound (A) deposited on said fibrous material in the form of short-staple fibers and an absorbent polymer said air molded mixture being in the form of a sheet containing said compounds (A) in a uniformly distributed state.

14. An article according to claim 1, wherein said absorbent member comprises at least two sheets of said fibrous material having said compound (A) deposited on said two sheets and said absorbent polymer interposed between said two sheets of said fibrous material after the pattern of a sandwich.

15. An article according to claims 10, 11, 12, 13 or 14, wherein said compound (A) is used in the form of an aqueous solution.

16. An article according to claims 8, 10, 12, or 14, wherein said sheets of fibrous material are made of at least one member selected from the group consisting of ground pulp and tissue paper.

17. An article according to claims 9, 11 or 13, wherein said fibrous material in the form of short-staple fibers is ground pulp.

18. An article according to claim 1, wherein said absorbent member is interposed between a back sheet impervious to body fluid and a top sheet pervious to body fluid.

19. An article according to claim 1, which is a disposable diaper.

20. An article according to claim 1, wherein said absorbent polymer is used in an amount falling in the range of 40 to 10% by weight, based on 60 to 90% by weight of said fibrous material.

21. An article according to claim 1, wherein said compound (A) is contained in said absorbent member in an amount falling in the range of 0.1 to 10 parts by weight, based on 100 parts by weight of said absorbent polymer