Biodegradable diaper

• US 5,185,009 A
• Filed: 10/28/1991
• Issued: 02/09/1993
• Est. Priority Date: 07/10/1989
• Status: Expired due to Fees

• Current Assignee: Elmo Sitnam
• Original Assignee: Elmo Sitnam
• Inventors: Sitnam, Elmo
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): ZUTTARELLI, ANTHONY
• Application Number:
  US07/782,739
• Time in Patent Office: 470 Days
• Field of Search: 604/365, 604/367, 604/369, 604/374, 604/375, 604/378, 604/385.2, 604/389, 604/391, 604/383, 604/358, 604/364, 604/385.1
• US Class Current: 604/364
• CPC Class Codes: A61F 13/15252 compostable or biodegradable
• CPC Class Codes: A61F 13/49009 with elastic means
• CPC Class Codes: A61F 13/53704 the layer having an inhibiting function on liquid propagation
• CPC Class Codes: A61F 13/53752 the layer is embedded in the absorbent core
• CPC Class Codes: A61F 2013/49031 being elastic in longitudinal direction
• CPC Class Codes: A61F 2013/51035 being biodegradable, e.g. Rayon, polylactate, dioxanone
• CPC Class Codes: A61F 2013/51433 being biodegradable
• CPC Class Codes: A61F 2013/53481 being biodegradable
• CPC Class Codes: A61L 15/40 containing ingredients of undetermined constitution or reaction products thereof , e.g. plant or animal extracts
• CPC Class Codes: A61L 15/62 Compostable, hydrosoluble or hydrodegradable materials

Abstract

A biodegradable diaper. The diaper has an outer sheet of biodegradable material able to resist water absorption. An inner sheet of biodegradable material is able to allow the passage of water and is attached to the outer sheet by a biodegradable adhesive at the periphery to form an envelope. A super absorbent core is located within the envelope. There is a water resistant film of biodegradable material located within the core to assist in fluid distribution into the core.

Claims

1. A biodegradable diaper comprising:

a) an outer sheet having a periphery of biodegradable material able to resist water absorption;

b) an inner sheet of biodegradable material able to allow passage of water therethrough and attached to the periphery of said outer sheet by a biodegradable adhesive to form an envelope having walls and defining a space therein;

c) said envelope having a waist portion and leg portions formed therein;

d) a biodegradable super absorbent core disposed within said envelope comprising a uniform material and substantially occupying all of said space within said envelope;

e) a water resistant film of biodegradable material having a peripheral edge surface, said film positioned within said core for assisting in fluid distribution into said core, said film edge surface substantially spaced from said envelope walls and extending substantially parallel to said inner and outer sheet of said envelope; and

f) strips of resilient biodegradable polyurethane polyester foam attached at said waist portion to allow said diaper to gather about a user'"'"'s waist.

2. A diaper as claimed in claim 1 in which said outer sheet is of rayon.

3. A diaper as claimed in claim 1 in which said outer sheet is polypropylene film.

4. A diaper as claimed in claim 1 in which said inner sheet is of polyethylene.

5. A diaper as claimed in claim 1 in which said biodegradable adhesive is rubber latex.

6. A diaper as claimed in claim 1 in which said super absorbent core is of wood fluff.

7. A diaper as claimed in claim 6 in which said wood fluff is sulfite cooked hemlock pulp.

8. A diaper as claimed in claim 1 in which said super absorbent core is starch graft polyacrylonitrile copolymer.

9. A diaper as claimed in claim 8 in which said copolymer is saponified.

10. A diaper as claimed in claim 1 in which said film within said core is polyethylene.

11. A biodegradable diaper as recited in claim 1, and further comprising:

a) said outer sheet provided with fastening tape for securing said diaper about the user.

12. A biodegradable diaper as recited in claim 11, and wherein:

a) said fastening tape comprising a cellulose film having an adhesive coated thereon.

13. A biodegradable diaper as recited in claim 1, and further comprising:

a) strips of natural biodegradable rubber attached between said inner sheet and said outer sheet at said leg portions to allow said diaper to gather about the users crotch.