Patent US4405325A successfully refreshed from Google Patents.
US4405325A
Expired / Lapsed
US
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Hydrophobic nonwoven fabric bonded by a copolymer formed from a diene
Assignee: Goodrich Corp
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Filing: 1981-08-03
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Granted: 1983-09-20
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Expires: 2001-08-03
Abstract
Abstract A nonwoven fabric comprising polyester fibers bonded with a water-insoluble, hydrophobic emulsion polymer of 50 to 80 parts by weight of an ethylenically unsaturated monomer selected from styrene, methyl methacrylate and alpha -methyl styrene, and 50 to 20 parts of a diene monomer selected from butadiene and isoprene, said polymer having a Tg in the range of -5 DEG C. to +25 DEG C.
Inventors
- 👤 George J. Antlfinger
- 👤 Pravinchandra K. Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:00
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/587; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/674
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A nonwoven fabric comprising fibers at least 50% of which are hydrophobic fibers bonded together by means selected from the group consisting essentially of a binder comprising a water-insoluble, hydrophobic polymer of unsaturated monomers comprising 50 to 80 parts by weight of an ethylenically unsaturated monomer selected from styrene, α-methyl styrene, methyl methacrylate and mixtures thereof, and 50 to 20 parts by weight of a diene monomer selected from butadiene, isoprene, and mixtures thereof, said bonded fabric has a minimum dry and wet tensile strength of 170 g/in and 155 g/in in across machine direction, respectively, a maximum strike through of 7.0 seconds, and a maximum surface wetness of 0.5 g.
Claim 2
Dependent Claim
111 words
A nonwoven fabric comprising fibers at least 50% of which are hydrophobic fibers bonded together by means selected from the group consisting essentially of a binder comprising a water-insoluble, hydrophobic polymer of unsaturated monomers comprising 50 to 80 parts by weight of an ethylenically unsaturated monomer selected from styrene, α-methyl styrene, methyl methacrylate and mixtures thereof, and 50 to 20 parts by weight of a diene monomer selected from butadiene, isoprene, and mixtures thereof, said bonded fabric has a minimum dry and wet tensile strength of 170 g/in and 155 g/in in across machine direction, respectively, a maximum strike through of 7.0 seconds, and a maximum surface wetness of 0.5 g.
Claim 3
Dependent Claim
35 words
Fabric of claim 1 wherein Tg of said binder is in the range of -5° C. to +25° C. and amount of said binder is about 10 to 100% by weight of the dry fibers.
Claim 4
Dependent Claim
26 words
Fabric of claim 1 wherein said unsaturated monomers include about 0.5 to 5 parts by weight of a hydrophilic monomer to reduce dry-out of said binder.
Claim 5
Dependent Claim
28 words
Fabric of claim 2 wherein said fibers are all polyester fibers and said polymer is prepared in absence of a multifunctional monomer and in absence of an emulsifier.
Claim 6
Dependent Claim
26 words
Fabric of claim 2 wherein said unsaturated monomers include about 0.1 to 5 parts by weight of a hydrophilic mnomer to reduce dry-out of said binder.
Claim 7
Dependent Claim
19 words
Fabric of claim 5 wherein said hydrophlic monomer is selected from acrylamide, acrylic acid, methacrylic acid and itaconic acid.
Claim 8
Dependent Claim
27 words
Fabric of claim 5 wherein said polyester fibers are poly(ethylene terephthalate) fibers and amount of said binder is 25 to 40% by weight of the dry fibers.
Claim 9
Dependent Claim
19 words
Fabric of claim 5 wherein said hydrophilic monomer is selected from acrylamide, acrylic and methacrylic acid and itaconic acid.
Claim 10
Dependent Claim
26 words
Fabric of claim 8 wherein said fibers are carded fibers about 2 to 5 cm in length and of about 11/2 denier, said polymer being uncrosslinked.
Claim 11
Dependent Claim
27 words
Fabric of claim 8 wherein said binder is a film-forming polymer of 33 parts butadiene, 65 parts styrene and 1.5 parts acrylamide that is free of emulsifier.
Claim 12
Dependent Claim
21 words
A diaper comprising an outer water-impervious layer, an inner coverstock comprising nonwoven fabric of claim 7, and an intermediate absorbent pad.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |