Patent US4668566A successfully refreshed from Google Patents.
US4668566A
Expired / Lapsed
US
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Multilayer nonwoven fabric made with poly-propylene and polyethylene
Assignee: Kimberly Clark Worldwide Inc
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Filing: 1985-10-07
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Granted: 1987-05-26
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Expires: 2005-10-07
Abstract
Abstract A nonwoven fabric is disclosed which comprises at least two layers of nonwoven web adjacent to and bonded to each other. Each web comprises a plurality of monofilaments of a thermoplastic material. In one of the webs, the thermoplastic material is polypropylene. In another of the layers, the thermoplastic material is polyethylene. Advantages of this combination of nonwoven webs comprising these polymers in layers in a multilayer nonwoven fabric are disclosed which include increased softness and tensile strength.
Inventors
- 👤 Ralph V. Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:48
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/51; A61F13/15577; A61F13/15617; A61F13/15658; A61F13/511; A61F13/5116; D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; A61F2013/15821; A61F2013/51002; A61F2013/51009; A61F2013/51038; A61F2013/5104; A61F2013/51042; A61F2013/51178; A61F2013/51182; A61F13/53; A61F2013/530131; A61F2013/530138; A61F2013/530153; A61F2013/53016; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24595; Y10T428/24603; Y10T428/24612; Y10T428/24802; Y10T428/24826; Y10T442/00; Y10T442/20; Y10T442/2484; Y10T442/2861; Y10T442/291
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
56 words
A multilayer nonwoven fabric comprising: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 2
Dependent Claim
56 words
A multilayer nonwoven fabric comprising: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 3
Dependent Claim
35 words
The multilayer nonwoven fabric of claim 1 wherein the first nonwoven web comprises a wetting agent incorporated within said polyethylene monofilaments to thereby make said first nonwoven web more wettable than said second nonwoven web.
Claim 4
Dependent Claim
35 words
The multilayer nonwoven fabric of claim 1 wherein the second nonwoven web comprises a wetting agent incorporated within said polypropylene monofilaments to thereby make said second nonwoven web more wettable than said first nonwoven web.
Claim 5
Dependent Claim
37 words
The multilayer nonwoven fabric of claim 1 wherein the first nonwoven web comprises a wetting agent applied to the exterior of said polyethylene monofilaments to thereby make said first nonwoven web more wettable than said second web.
Claim 6
Dependent Claim
36 words
The nonwoven liner of claim 1 wherein the second nonwoven web comprises a wetting agent applied to the exterior of said polypropylene monofilaments to thereby make said second nonwoven web more wettable than said first web.
Claim 7
Dependent Claim
61 words
A multilayer nonwoven liner for a disposable diaper which comprises: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 8
Dependent Claim
61 words
A multilayer nonwoven liner for a disposable diaper which comprises: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 9
Dependent Claim
61 words
A multilayer nonwoven wrap for a catamental device which comprises: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 10
Dependent Claim
61 words
A multilayer nonwoven wrap for a catamental device which comprises: a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 11
Dependent Claim
75 words
In an absorbent article which comprises a liner and an absorbent batt, the improvement comprising employing as the liner a multilayer nonwoven fabric comprising a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 12
Dependent Claim
75 words
In an absorbent article which comprises a liner and an absorbent batt, the improvement comprising employing as the liner a multilayer nonwoven fabric comprising a first nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polyethylene monofilaments; and a second nonwoven web which is adjacent and bonded to said first nonwoven web, said second nonwoven web comprising a plurality of substantially identically prepared continuous and substantially randomly deposited polypropylene monofilaments.
Claim 13
Dependent Claim
16 words
The improvement of claim 8 wherein the first nonwoven web is adjacent to said absorbent batt.
Claim 14
Dependent Claim
33 words
The improvement of claim 9 wherein the first nonwoven web comprises a wetting agent incorporated within the polyethylene monofilaments sufficient to make said first nonwoven web more wettable than said second nonwoven web.
Claim 15
Dependent Claim
36 words
The improvement of claim 9 wherein the first nonwoven web comprises a wetting agent applied to the exterior of the polyethylene monofilaments sufficient to make said first nonwoven web more wettable than said second nonwoven web.
Claim 16
Dependent Claim
16 words
The improvement of claim 8 wherein the second nonwoven web is adjacent to said absorbent batt.
Claim 17
Dependent Claim
33 words
The improvement of claim 12 wherein the second nonwoven web comprises a wetting agent incorporated within the polypropylene monofilaments sufficient to make said second nonwoven web more wettable than said first nonwoven web.
Claim 18
Dependent Claim
36 words
The improvement of claim 12 wherein the second nonwoven web comprises a wetting agent applied to the exterior of the polypropylene monofilaments sufficient to make said second nonwoven web more wettable than said first nonwoven web.
Claim 19
Dependent Claim
100 words
In a process for forming a nonwoven fabric which process comprises: continuously extruding polypropylene through a spinneret having a plurality of orifices to form discrete polypropylene monofilaments; drawing the polypropylene monofilaments; and depositing the polypropylene monofilaments in a substantially random manner to form a polypropylene nonwoven web; the improvement comprising: continuously extruding polyethylene through a spinneret having a plurality of orifices to form discrete polyethylene monofilaments; drawing the polyethylene monofilaments; and depositing the polyethylene monofilaments in a substantially random manner to form a polyethylene web; bonding the polyethylene web to the polypropylene web to thereby form a multilayer nonwoven fabric.
Claim 20
Dependent Claim
100 words
In a process for forming a nonwoven fabric which process comprises: continuously extruding polypropylene through a spinneret having a plurality of orifices to form discrete polypropylene monofilaments; drawing the polypropylene monofilaments; and depositing the polypropylene monofilaments in a substantially random manner to form a polypropylene nonwoven web; the improvement comprising: continuously extruding polyethylene through a spinneret having a plurality of orifices to form discrete polyethylene monofilaments; drawing the polyethylene monofilaments; and depositing the polyethylene monofilaments in a substantially random manner to form a polyethylene web; bonding the polyethylene web to the polypropylene web to thereby form a multilayer nonwoven fabric.
Claim 21
Dependent Claim
95 words
The improvement of claim 15 wherein said bonding is accomplished by passing said polypropylene web and said polyethylene web between two oppositely rotating rolls, at least one of which is heated, and at least one of which has a raised pattern to thereby form a plurality of discrete compacted areas of thermally induced filament bonds extending through a major portion of the thickness of both webs, said compacted areas being distributed in an intermittent pattern corresponding to the raised pattern of the at least one roll and said intermittent pattern providing unbonded filament spans therebetween.
Claim 22
Dependent Claim
24 words
The improvement of claim 15 wherein the polypropylene web is stabilized by interfilament bonding before the polyethylene web is bonded to said polypropylene web.
Claim 23
Dependent Claim
93 words
The improvement of claim 17 wherein said interfilament bonding is accomplished by passing said polypropylene web between two oppositely rotating rolls, at least one of which is heated, and at least one of which has a raised pattern to thereby form a plurality of discrete compacted areas of thermally induced filament bonds extending through a major portion of the thickness of the polypropylene web, said compacted areas being distributed in an intermittent pattern corresponding to the raised pattern of the at least one roll and said intermittent pattern providing unbonded filament spans therebetween.
Claim 24
Dependent Claim
24 words
The improvement of claim 15 wherein the polyethylene web is stabilized by interfilament bonding before the polypropylene web is bonded to said polyethylene web.
Claim 25
Dependent Claim
93 words
The improvement of claim 19 wherein said interfilament bonding is accomplished by passing said polyethylene web between two oppositely rotating rolls, at least one of which is heated, and at least one of which has a raised pattern to thereby form a plurality of discrete compacted areas of thermally induced filament bonds extending through a major portion of the thickness of the polyethylene web, said compacted areas being distributed in an intermittent pattern corresponding to the raised pattern of the at least one roll and said intermittent pattern providing unbonded filament spans therebetween.
Claim 26
Dependent Claim
29 words
The improvement of claim 15 wherein a wetting agent is incorporated into the polypropylene filaments of the polypropylene web to thereby make it more wettable than the polyethylene web.
Claim 27
Dependent Claim
32 words
The improvement of claim 15 wherein a wetting agent is applied to the exterior of the polypropylene filaments of the polypropylene web to thereby make it more wettable than the polyethylene web.
Claim 28
Dependent Claim
29 words
The improvement of claim 15 wherein a wetting agent is incorporated into the polyethylene filaments of the polyethylene web to thereby make it more wettable than the polyethylene web.
Claim 29
Dependent Claim
32 words
The improvement of claim 15 wherein a wetting agent is applied to the exterior of the polyethylene filaments of the polyethylene web to thereby make it more wettable than the polypropylene web.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |