US5019072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable diaper that is fastened by contact between overlapping adhesive patches
Assignee: 3M Co
•
Filing: 1990-02-27
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Granted: 1991-05-28
•
Expires: 2010-02-27
Abstract
Abstract A disposable diaper can be fastened securely around a person and be refastenable when it has an adhesive patch on the faces of corners at the back of the diaper, each of which patches contacts an adhesive patch on the front of the diaper, which patches form bonds to each other that have strong resistance to shear forces, can easily be peeled apart after 2 hours at room temperature and do not adhere either to ordinary packaging materials or to nonadhesive surfaces of the diaper. All of the adhesive patches can be cut from a single adhesive tape that has a flexible backing, one face of which bears a layer of the peelable adhesive while the other layer bears a layer of an adhesive that forms a strong, permanent bond to the diaper.
Inventors
- 👤 Stephen P. Polski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:54
CPC Classifications
C; C09; C09J; C09J153/00; A; A61; A61F; A61F13/00; A61F13/15; A61F13/56; A61F13/58; C09J153/02; A61F2013/586
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
135 words
A refastenable disposable diaper comprising a composite including an absorbent core encased between a liquid-permeable user-contacting topsheet and an outer shell of thin thermoplastic film, the back of the composite having a pair of ears that overlap ears on the front of the diaper when the diaper is wrapped around a person, wherein said diaper has outer fastening means for holding the diaper in its wrapped position, further comprising an inner fastening means comprising peelable adhesive patches on faces of the back and front ears of the diaper that overlap when the diaper is in its wrapped position, and which places the patches in contact with each other, which patches will form bonds to each other that have resistance to shear forces and can be peeled apart by hand after 2 hours at room temperature.
Claim 2
Dependent Claim
135 words
A refastenable disposable diaper comprising a composite including an absorbent core encased between a liquid-permeable user-contacting topsheet and an outer shell of thin thermoplastic film, the back of the composite having a pair of ears that overlap ears on the front of the diaper when the diaper is wrapped around a person, wherein said diaper has outer fastening means for holding the diaper in its wrapped position, further comprising an inner fastening means comprising peelable adhesive patches on faces of the back and front ears of the diaper that overlap when the diaper is in its wrapped position, and which places the patches in contact with each other, which patches will form bonds to each other that have resistance to shear forces and can be peeled apart by hand after 2 hours at room temperature.
Claim 3
Dependent Claim
26 words
A disposable diaper as defined in claim 1 and having a separate patch of said peelable adhesive at each ear at the front of the diaper.
Claim 4
Dependent Claim
65 words
A disposable diaper as defined in claim 2 having a separate patch of said peelable adhesive at each ear at the back of the diaper wherein each patch of said peelable adhesive at the back of the diaper is from 3 to 6 cm in length and from 1.5 to 3 cm in width, with the lengthwise direction parallel to the waist band lengthwise direction.
Claim 5
Dependent Claim
48 words
A disposable diaper as defined in claim 3 wherein each patch of said peelable adhesive at the front of the diaper is from 3 to 6 cm in length and from 1.5 to 3 cm in width, with the lengthwise direction orthogonal to the waist band lengthwise direction.
Claim 6
Dependent Claim
62 words
A disposable diaper as defined in claim 1 wherein each of said patches of peelable adhesive is cut from a single adhesive tape that has a flexible backing, one face of which bears a layer of peelable adhesive while the other layer bears a layer of an adhesive that will permanently bond to the topsheet or the outer shell of the diaper.
Claim 7
Dependent Claim
32 words
A disposable diaper as defined in claim 1 wherein when two of said peelable adhesive patches are bonded to each other, the force to peel them apart is from 1 to 12N.
Claim 8
Dependent Claim
26 words
A disposable diaper as defined in claim 1 wherein each of said peelable adhesive patches has a T-Peel Value (as herein defined) not exceeding 7N/25 mm.
Claim 9
Dependent Claim
22 words
A disposable diaper as defined in claim 7 wherein each of said adhesive patches has a T-Peel Value not exceeding 2N/25 mm.
Claim 10
Dependent Claim
34 words
A disposable diaper as defined in claim 1 wherein a patch of said peelable adhesive is carried by a flexible backing that is ultrasonically bonded to one of the topsheets and the outer shell.
Claim 11
Dependent Claim
16 words
A disposable diaper as defined in claim 9 wherein said flexible backing is a polyethylene film.
Claim 12
Dependent Claim
16 words
A disposable diaper as defined in claim 9 wherein said flexible backing is a polypropylene film.
Claim 13
Dependent Claim
23 words
A disposable diaper as defined in claim 1 wherein said outer fastening means comprises at least a pair of pressure-sensitive adhesive fastening tabs.
Claim 14
Dependent Claim
117 words
A disposable diaper as defined in claim 1 wherein the peelable adhesive of each of the patches comprises a composition of by weight: from 20 to 80 parts of at least one elastomeric block copolymer selected from styrene/butadiene, styrene/isoprene, and styrene/ethylene-butylene block copolymers, and correspondingly from 80 to 20 parts of tackifying material selected from tackifier resin and a blend of tackifier resin and liquid plasticizer oil, which peelable adhesive is hot-melt coatable and has a composite midblock glass transition temperature (CMTg) from 220 Kelvin to 240 Kelvin when the adhesive is based on styrene/isoprene or styrene/ethylene-butylene block copolymers and a CMTg from 215 Kelvin and 235 Kelvin when the adhesive is based on styrene/butadiene block copolymer.
Claim 15
Dependent Claim
26 words
A disposable diaper as defined in claim 13 wherein the elastomeric block copolymer comprises from 55 to 80 parts by weight of the peelable adhesive composition.
Claim 16
Dependent Claim
26 words
A disposable diaper as defined in claim 13 wherein the CMTg of the peelable adhesive is within 10 Kelvin of the top of an aforementioned range.
Claim 17
Dependent Claim
43 words
A disposable diaper as defined in claim 1 wherein said peelable adhesive is a low or no tack adhesive which adhesive does not adhere to ordinary packaging materials or to nonadhesive surfaces of the diaper so as not requiring a protective release tape.
References Cited (Backward Citations)
US2649858A
Cited
US2649856A
Cited
US2704732A
Cited
US2714562A
Cited
US2962404A
Cited
US3049228A
Cited
US3089494A
Cited
US3239478A
Cited
US3635861A
Cited
US3954692A
Cited
US3638651A
Cited
US3917607A
Cited
US3932328A
Cited
US4001072A
Cited
US4189547A
Cited
US4136071A
Cited
US4181635A
Cited
US4163077A
Cited
GB2035053A
Cited
US4418123A
Cited
US4288567A
Cited
US4399249A
Cited
GB2116253A
Cited
US4514554A
Cited
US4780367A
Cited
US4522874A
Cited
US4714749A
Cited
US4526577A
Cited
US4717749A
Cited
US4761341A
Cited
US4684685A
Cited
US4699622A
Cited
US4728572A
Cited
JPS63189485A
Cited
JPS6418604A
Cited
JPS6438280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |