US4356229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded nonwoven fabrics suitable for diaper coverstock
Assignee: Rohm and Haas Co
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Filing: 1980-10-20
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Granted: 1982-10-26
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Expires: 2000-10-20
Abstract
Abstract This invention concerns a nonwoven fabric particularly adapted for use as a diaper coverstock. The fabric consists essentially of fibers and a binder wherein at least 50%, by weight, of the fibers are hydrophobic fibers. The binder comprises a water insoluble, hydrophobic, emulsion copolymer of ethylenically unsaturated monomers comprising (A) 1 to 8% by weight of a monoethylenically unsaturated carboxylic acid, or a mixture thereof, (B) 50 to 75% by weight of a C 4 to C 8 alkyl acrylate or a mixture thereof, and (C) 20 to 49% by weight of methyl methacrylate, styrene, α-methyl styrene or a mixture thereof. The fabric has sufficient wet tensile strength for use as a diaper coverstock.
Inventors
- 👤 John G. Brodnyan
- 👤 Walter G. De Witt, III
- 👤 Robert A. Gill
- 👤 Gary D. Stelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:42
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/16; C08F220/18; C08F220/1802; C08F220/1804; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2221
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
139 words
A nonwoven fabric consisting essentially of fibers and a binder, (A) at least 50%, by weight, of the fibers being hydrophobic fibers having a moisture regain less than 2.5% of the fiber weight at 70° F. and 65% RH, (B) the binder being free of formaldehyde condensates and comprising a water-insoluble, hydrophobic, emulsion copolymer of ethylenically unsaturated monomers comprising (a) 1 to 8%, by weight, of a monoethylenically unsaturated carboxylic acid or a mixture thereof. (b) 50 to 75%, by weight, of a C 4 to C 8 alkyl acrylate or a mixture thereof, and (c) 20 to 49%, by weight, of one or more hard monomers, and (C) the fabric having a water-wet tensile strength, determined on a 2.5 cm wide specimen having a dry weight between 23 and 26 g/m 2 , of at least 1.5 kg.
Claim 2
Dependent Claim
139 words
A nonwoven fabric consisting essentially of fibers and a binder, (A) at least 50%, by weight, of the fibers being hydrophobic fibers having a moisture regain less than 2.5% of the fiber weight at 70° F. and 65% RH, (B) the binder being free of formaldehyde condensates and comprising a water-insoluble, hydrophobic, emulsion copolymer of ethylenically unsaturated monomers comprising (a) 1 to 8%, by weight, of a monoethylenically unsaturated carboxylic acid or a mixture thereof. (b) 50 to 75%, by weight, of a C 4 to C 8 alkyl acrylate or a mixture thereof, and (c) 20 to 49%, by weight, of one or more hard monomers, and (C) the fabric having a water-wet tensile strength, determined on a 2.5 cm wide specimen having a dry weight between 23 and 26 g/m 2 , of at least 1.5 kg.
Claim 3
Dependent Claim
19 words
The fabric of claim 1, the hard monomers being one or more of methyl methacrylate, sytrene and α-methyl styrene.
Claim 4
Dependent Claim
39 words
The fabric of claim 2, the molecular weight of the copolymer being greater than 100,000, the binder being from about 10% to 100% of the dry fiber by weight, and the acid being acrylic, methacrylic or a mixture thereof.
Claim 5
Dependent Claim
26 words
The fabric of claim 3, the copolymer being thermoplastic, having a glass transition temperature below 30° C. and being a copolymer of monomers other than acrylonitrile.
Claim 6
Dependent Claim
40 words
The fabric of claim 4, the hydrophobic fibers being polyester fibers, the copolymer having a weight average molecular weight greater than 300,000, the monomers comprising 1 to 5% acid monomers and the wet tensile strength being at least 2.0 kg.
Claim 7
Dependent Claim
31 words
The fabric of claim 5, the copolymer being from 20 to 50% of the dry fiber by weight, the fibers being in a carded array and consisting essentially of polyester fibers.
Claim 8
Dependent Claim
28 words
The fabric of claim 6 wherein the monomers comprise (a) 2 to 4% by weight of acid monomers and (b) 55 to 70% by weight of butyl acrylate.
Claim 9
Dependent Claim
57 words
The fabric of claim 4, the hydrophobic fibers being polyolefin fibers and the monomers comprising (a) 1 to 6% by weight of acid, (b) 55 to 70% by weight of a C 4 to C 8 alkyl acrylate or a mixture thereof and (c) 25 to 40% by weight of styrene, α-methyl styrene or a mixture thereof.
Claim 10
Dependent Claim
25 words
The fabric of claim 8, a major proportion of the fibers being polypropylene fibers, the copolymer having a weight strength being at least 2.0 kg.
Claim 11
Dependent Claim
32 words
The fabric of claim 9, the fibers being in a carded array and consisting essentially of polypropylene fibers and the copolymer being from 30% to 60% of the dry fiber by weight.
Claim 12
Dependent Claim
26 words
The fabric of claim 10, the monomers comprising (a) 2 to 4% acid monomers, (b) 55 to 70% butyl acrylate and (c) 28 to 40% styrene.
Claim 13
Dependent Claim
16 words
The fabric of claim 8 comprising fluorocarbon surfactant up to 2% by weight of the binder.
Claim 14
Dependent Claim
25 words
The fabric of claim 7, the surfactant having surface tensions of about 24 and 23 dynes/cm at 0.01% and 0.1, by weight in water, respectively.
Claim 15
Dependent Claim
18 words
The fabric of claim 11 comprising a nonionic fluorocarbon surfactant up to 2% by weight of the binder.
Claim 16
Dependent Claim
25 words
The fabric of claim 14, the surfactant having surface tensions of about 24 and 23 dynes/cm at 0.01% and 0.1%, by weight in water, respectively.
Claim 17
Dependent Claim
31 words
A process of making a nonwoven, wet-strength fabric which comprises associating the hydrophobic fibers and the emulsion copolymer of claim 1 and drying the fibrous product to render it water resistant.
Claim 18
Dependent Claim
30 words
A process of making a nonwoven, wet-strength fabric which comprises associating the hydrophobic fibers and the emulsion copolymer of claim 5 and drying the fibrous product to render it water-resistant.
Claim 19
Dependent Claim
31 words
A process of making a nonwoven, wet-strength fabric which comprises associating the hydrophobic fibers and the the emulsion copolymer of claim 8 and drying the fibrous product to render it water-resistant.
Claim 20
Dependent Claim
25 words
A disposable sanitary product comprising the fabric of claim 1 as a facing layer adapted to be positioned in contact with a wearer or user.
Claim 21
Dependent Claim
25 words
A disposable sanitary product comprising the fabric of claim 5 as a facing layer adapted to be positioned in contact with a wearer or user.
Claim 22
Dependent Claim
25 words
A disposable sanitary product comprising the fabric of claim 8 as a facing layer adapted to be positioned in contact with a wearer or user.
Claim 23
Dependent Claim
11 words
The fabric of claim 1 in the form of diaper coverstock.
Claim 24
Dependent Claim
11 words
The fabric of claim 7 in the form of diaper coverstock.
Claim 25
Dependent Claim
11 words
The fabric of claim 11 in the form of diaper coverstock.
References Cited (Backward Citations)
US2931749A
Cited
US3020178A
Cited
US3157562A
Cited
US3554788A
Cited
US3616166A
Cited
US4066584A
Cited
US4148987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |