Flushable diaper and method

• US 5,830,201 A
• Filed: 05/23/1997
• Issued: 11/03/1998
• Est. Priority Date: 01/14/1994
• Status: Expired due to Fees

• Current Assignee: Frederick W. George
• Original Assignee: Frederick W. George
• Inventors: George, deceased, Virginia C., George, Frederick W.
• Primary Examiner(s): Polutta, Mark O.
• Application Number:
  US08/862,792
• Time in Patent Office: 529 Days
• Field of Search: 604/368, 604/358, 604/385.1, 604/364, 604/393, 604/394, 604/395, 604/387, 604/398-399
• US Class Current: 604/364
• CPC Class Codes: A61F 13/15211 soluble or disintegratable in liquid
• CPC Class Codes: A61F 13/15252 compostable or biodegradable

Abstract

A flushable diaper for use on the body of an infant or adult. An envelope has inner and outer walls which are secured together at their outer periphery to form an inner cavity. The outer wall is comprised of a hydrophobic outer layer together with a hydrophilic inner layer. The inner wall is comprised of a hydrophobic outer layer together with a hydrophilic inner layer. The inner and outer walls are separated by an interior cavity which contains one or more containers. The container is comprised of either a single layer or a laminated wall which forms a chamber that encloses a charge of water. The laminated wall is comprised a hydrophobic inner laminate and a hydrophilic outer laminate. When manually ruptured, the containers release water into the double walled envelope, which causes disintegration of the hydrophilic inner layers of the double walls, along with the hydrophobic outer layers. An absorbent member is carried on the inner wall of the envelope, and the absorbent member comprises a fluid pervious cover which encloses an inner body that is comprised of a material which is sufficiently hydrophilic to absorb urine and other fluids from the body while maintaining structural integrity of the inner body and to also absorb water in an effective amount to cause the inner body to disintegrate into small pieces.

Claims

1. A flushable diaper for wearing on the lower torso of an infant or adult, the diaper comprising the combination of a sealed envelope having an inner wall and an outer wall forming a double wall construction, which cooperate to define an interior cavity, the outer wall facing in an outward direction away from the torso when the diaper is being worn and with the inner wall facing in an inward direction toward the torso, the outer wall being comprised of an inner layer and an outer layer, the outer layer being carried on a side of the inner layer which faces in the outward direction, the inner layer being comprised of a material which is sufficiently hydrophilic to absorb water in an effective amount to cause disintegration of the outer wall, the inner wall being comprised of an inner layer and an outer layer, the outer layer being carried on a side of the inner layer which faces in the inward direction, the inner layer being comprised of a material which is sufficiently hydrophilic to absorb water in an effective amount to cause disintegration of the inner wall, an absorbent member carried by the inner wall, the absorbent member having an inner body, the inner body being comprised of a material which is sufficiently hydrophilic to absorb urine and other fluids from the torso while maintaining structural integrity of the inner body and to also absorb water in an effective amount to cause the inner body to disintegrate, and a container within the interior cavity for containing a charge of water, the container having a structural strength which is sufficient to normally contain the charge of water when the diaper is being worn, and the structural strength further being sufficient to enable a predetermined amount of force applied against the container to cause the container to rupture and enable the charge of water to egress from the container and discharge into the interior cavity whereby the inner layer of the outer wall together with inner layer of the inner wall and the inner body of the absorbent member absorb respective portions of the charge of water which are sufficient to cause disintegration of the diaper.

2. A flushable diaper as in claim 1 and further comprising a cover having a tear portion which is sufficiently weak for enabling a user to manually tear an opening through the cover to enable, when the outer wall is submerged in a body of water, ingress of a portion of the body of water through the opening and into the absorbent member in an amount of water which is sufficient to cause the inner body of the absorbent member to disintegrate.

3. A flushable diaper as in claim 1 which the cover is comprised of a pervious material.

4. A flushable diaper as in claim 3 which the material of the inner and outer walls of the sealed envelope are comprised of polyvinyl alcohol.

5. A flushable diaper as in claim 1 which further comprises a sheet carried within the interior cavity, the sheet being formed of a material which is sufficiently hydrophilic to wick water along the internal cavity.

6. A flushable diaper as in claim 1 in which the outer layer is comprised of a hydrophobic material.

7. A flushable diaper as in claim 6 which the hydrophobic material is comprised of poly(vinylidene) dichloride.

8. A flushable diaper as in claim 1 in which the material of the inner layer is comprised of polyvinyl alcohol.

9. A flushable diaper as in claim 1 which the material of the inner wall is comprised of polyvinyl alcohol.

10. A flushable diaper as in claim 1 in which the sealed envelope is comprised of a double wall construction having an inner wall and an outer wall, which cooperate to define an interior cavity, which with the entry of water from the exterior into this interior cavity, between the double walls, the disintegration of the diaper is enabled.

11. A flushable diaper as in claim 1 in which the material of the inner body of the absorbent member comprises a hydrophilic composition having the property of absorbing water in an effective amount to form a colloidal suspension and break down the structural integrity of the inner body.

12. A flushable diaper as in claim 11 which the hydrophilic composition of the inner body is comprised of a hydrogel polymer which forms the colloidal suspension with water.

13. A flushable diaper as in claim 12 which the hydrogel polymer is comprised of molecules which are sufficiently free of cross-linking for absorbing water in an effective amount to form said colloidal suspension.

14. A flushable diaper as in claim 12 which the hydrophilic composition is further comprised of biodegradable cellulosic fibers.

15. A flushable diaper as in claim 1 in which the absorbent member is adhered to the inner wall of the envelope.

16. A flushable diaper as in claim 1 in which the inner and outer walls have outer perimeter portions which are sealed together.

17. A flushable diaper as in claim 1 in which the container comprises an exterior wall which encloses the charge of water, the exterior wall comprising a material selected from the group consisting of polyethylene, polypropylene, polyvinyl acetate and polyvinyl alcohol.

18. A flushable diaper as in claim 17 in which the polyvinyl alcohol is in a layer having a hydrophobic coating on the inner surface, which is in contact with the charge of water.

19. A flushable diaper as in claim 18 in which the hydrophobic coating is comprised of poly(vinylidene) dichloride.

20. A flushable diaper as in claim 1 in which the container is comprised of a laminated wall which at least partially encloses a chamber in which the charge of water is contained, the laminated wall having an inner laminate and an outer laminate carried on the outer surface of the inner laminate, the inner laminate being comprised of a hydrophobic material.

21. A flushable diaper as in claim 20 in which the laminated wall has a strength which is sufficiently weak to enable the laminated wall to rupture responsive to application of the predetermined force.

22. A flushable diaper as in claim 20 which the outer laminate is comprised of polyvinyl alcohol.

23. A flushable diaper as in claim 20 in which the hydrophobic material of the inner laminate is poly(vinylidene) dichloride.

24. A flushable diaper as in claim 1 in which the absorbent member has a fluid pervious cover surrounding at least a portion of the inner body.

25. A method of using a flushable diaper providing a flushable diaper for use on the lower torso of an infant or adult, the method comprising the steps of providing an envelope having an inner and an outer wall with the outer wall being comprised of a hydrophobic outer layer and a hydrophilic inner layer, and the inner wall being comprised of a hydrophobic outer layer and a hydrophilic inner layer, providing an absorbent member on the side of the inner wall which faces the lower torso when the diaper is being worn, the absorbent member comprising a fluid pervious cover and a hydrophilic inner body, passing excretory fluids from the lower torso through the cover and into the inner body, absorbing the excretory fluids into the inner body while maintaining the structural integrity of the inner body, infusing water into the inner body in an amount sufficient to form a colloidal suspension with the material of the inner body for breaking down the structural integrity of the inner body, providing a water-filled container within an interior cavity between the inner and outer walls with the container being comprised of a laminated wall having a hydrophobic inner laminate and a hydrophilic outer laminate, applying a force to rupture the container, releasing water from within the container and causing the water to be absorbed by the hydrophilic inner layers and the absorbent member.

26. A method as in claim 25 in which the diaper is placed into a body of water after the container is ruptured.