Sheet product containing sorbent particulate material

• US 4,429,001 A
• Filed: 03/04/1982
• Issued: 01/31/1984
• Est. Priority Date: 03/04/1982
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: 3M Company
• Inventors: Brownlee, David C., Kolpin, Barbara E.
• Primary Examiner(s): CANNON, JAMES
• Application Number:
  US06/354,806
• Time in Patent Office: 698 Days
• Field of Search: 428/283, 428/296, 428/297, 428/303, 428/323, 428/327, 428/332, 428/338, 428/903, 428/913
• US Class Current: 442/340
• CPC Class Codes: A61F 13/15658 Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
• CPC Class Codes: A61F 2013/15967 by meltblown technique
• CPC Class Codes: A61F 2013/530496 being fixed to fibres
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: D04H 1/56 in association with fibre formation, e.g. immediately following extrusion of staple fibres
• CPC Class Codes: Y10S 428/903 Microfiber, less than 100 micron diameter
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/268 Monolayer with structurally defined element
• CPC Class Codes: Y10T 442/614 Strand or fiber material specified as having microdimensions [i.e., microfiber]
• CPC Class Codes: Y10T 442/619 Including other strand or fiber material in the same layer not specified as having microdimensions
• CPC Class Codes: Y10T 442/626 Microfiber is synthetic polymer
• CPC Class Codes: Y10T 442/627 Strand or fiber material is specified as non-linear [e.g., crimped, coiled, etc.]
• CPC Class Codes: Y10T 442/632 A single nonwoven layer comprising non-linear synthetic polymeric strand or fiber material and strand or fiber material not specified as non-linear
• CPC Class Codes: Y10T 442/699 Including particulate material other than strand or fiber material

Abstract

New sorbent sheet products are prepared comprising a coherent web of entangled blown fibers prepared by extruding liquid fiber-forming material into a high-velocity gaseous stream and an array of super absorbent polymeric particles dispersed within the web.

Claims

1. A sorbent sheet product comprising a coherent web of entangled melt blown fibers and an array of solid high-sorbency liquid-sorbent polymeric particles uniformly dispersed and physically held within the web, said particles swelling upon sorption of liquid and the web expanding as the particles swell with sorbed liquid.

2. A sheet product of claim 1 in which the sorbent particles comprise at least 20 volume-percent of the solid content of the sheet product.

3. A sheet product of claim 1 in which the sorbent particles comprise at least 50 volume-percent of the solid content of the sheet product.

4. A sheet product of claim 1 in which the blown fibers comprise microfibers averaging less than about 10 micrometers in diameter.

5. A sheet product of claim 1 in which the sorbent particles are capable of sorbing about 20 or more times their own weight of a liquid.

6. A sheet product of claims 1, 2, 3, 4, or 5 in which surfactant particles which assist wetting of the web by a liquid to be sorbed are also dispersed within the web of fibers.

7. A sheet product of claims 1, 2, 3, 4 or 5 in which the sorbent particles are selected from modified starches and acrylic polymers having hydrophilic functionality.

17. A sheet product of claim 1 which includes other fibers mixed with the blown fibers.

18. Sheet product of claim 17 in which the other fibers comprise crimped fibers which increase the loft of the sheet product.

23. A sheet product of claims 1, 2, 3, 4, 5, 17 or 18 in which a surfactant which assists wetting of the web by a liquid to be sorbed is included in the web.

8. A sorbent sheet product comprising a coherent web of entangled melt-blown organic polymeric microfibers averaging less than about 20 micrometers in diameter and an array of solid sorbent particles dispersed and physically held in the web, the particles accounting for at least about 20 volume-percent of the solid content of the sheet product and being capable of sorbing about 20 or more times their weight of a liquid, and the web being capable of expanding at least 3 times its original thickness as the particles sorb liquid.

9. A sheet product of claim 8 in which the sorbent particles account for at least about 50 volume-percent of the solid content of the sheet product.

10. A sheet product of claim 8 in which the microfibers are selected from polypropylene, polyethylene, polyethylene terephthalate and polyamides.

11. A sheet product of claim 8 in which the sorbent particles are selected from modified starches and acrylic polymers having hydrophilic functionality.

12. A sheet product of claim 8 in which the sorbent particles range between about 50 and 3000 micrometers in diameter.

19. A sheet product of claim 8 which includes other fibers mixed with the melt-blown organic polymeric microfibers.

20. Sheet product of claim 19 in which the other fibers are crimped fibers that increase the loft of the sheet product.

24. A sheet product of claim 8, 9, 19 or 20 in which a surfactant which assists wetting of the web by a liquid to be sorbed is included in the web.

13. A sorbent sheet product comprising a coherent web of entangled melt-blown organic polymeric microfibers averaging less than about 10 micrometers in diameter, an array of solid sorbent particles uniformly dispersed and physically held within the web, and a surfactant which assists wetting of the web by water, the sorbent particles accounting for at least about 20 volume-percent of the solid content of the sheet product, and sorbing about 20 or more times their weight of water, and the sheet product being capable of expanding at least 3 times its original thickness as the particles sorb water.

14. A sheet product of claim 13 in which the sorbent particles are selected from modified starches and acrylic polymers having hydrophilic functionality.

15. A sheet product of claim 14 in which the sorbent particles range between about 50 and 3000 micrometers in diameter.

16. A sheet product of claim 13 in which the sorbent particles account for at least about 50 volume-percent of the solid content of the sheet product.

21. A sheet product of claim 13 which includes other fibers mixed with the melt-blown organic polymeric microfibers.

22. A sheet product of claim 21 in which the other fibers are crimped fibers that increase the loft of the sheet product.

25. A sheet product of claim 13, 21 or 22 in which the surfactant comprises particles that are mixed with the sorbent particles.