US5194121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needled felt for papermaking use
Assignee: DIC Corp
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Filing: 1989-11-29
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Granted: 1993-03-16
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Expires: 2009-11-29
Abstract
Abstract A needled felt for papermaking use of the present invention comprises fibers (having a specific fineness or diameter) formed of a polyamide block copolymer, particularly, polyamide block copolymer having hard segments composed of polyamide components such as nylon 12 and soft segments composed of polyether components, the felt of the present invention is excellent in elasticity, recovery and durability compared with other fibers exhibiting rubber-like elasticity such as polyurethane elastic fibers, in addition, the felt of the present invention facilitate needling which has been difficult with prior art rubbery elastic fibers.
Inventors
- 👤 Hiroshi Taguchi
- 👤 Masayuki Ito
- 👤 Junichi Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:28
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/42; D04H1/4326; D04H1/4334; D21; D21F; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10S; Y10S162/00; Y10S162/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
230 words
A needled felt for papermaking use having a base fabric and fibrous batt layer overlaid on one surface or both surfaces of said base fabric, said base fabric and said fibrous batt layer being unified by needling, wherein said fibrous batt layer and/or said base fabric mainly comprises fibers formed of a polyamide block copolymer having polyamide segments composed of at least one member selected from the group consisting of polycondensation products of dicarboxylic acids, polycondensation products of dicarboxylic acid and diamines, polymerization products of cyclic lactams, polycondensation products of aminocarboxylic acids, and copolymerization products of cyclic lactams, dicarboxylic acids, and diamines, and said polyamide block copolymer having polyether components composed of at least one member selected from the group consisting of diamines represented by the formula H.sub.2 N--CH.sub.2).sub.a O[(CH.sub.2).sub.b O].sub.c [(CH.sub.2).sub.d O].sub.e (H.sub.2).sub.f NH.sub.2 where a, b, d, and f are integers of at least 2, e is an integer of from 2 to 30, and c is 0 or an integer of from 2 to 30, and polyether glycols, said fibers comprised in said fibrous batt layer being fibers of 4 to 50 denier, and said fibers comprised in said base fabric being woolen yarns composed of fibers of 4 to 50 denier, multifilament yarns each filament of which has a fineness of 4 to 50 denier or monofilament yarns having a diameter of 0.1 to 0.8 mm.
Claim 2
Dependent Claim
230 words
A needled felt for papermaking use having a base fabric and fibrous batt layer overlaid on one surface or both surfaces of said base fabric, said base fabric and said fibrous batt layer being unified by needling, wherein said fibrous batt layer and/or said base fabric mainly comprises fibers formed of a polyamide block copolymer having polyamide segments composed of at least one member selected from the group consisting of polycondensation products of dicarboxylic acids, polycondensation products of dicarboxylic acid and diamines, polymerization products of cyclic lactams, polycondensation products of aminocarboxylic acids, and copolymerization products of cyclic lactams, dicarboxylic acids, and diamines, and said polyamide block copolymer having polyether components composed of at least one member selected from the group consisting of diamines represented by the formula H.sub.2 N--CH.sub.2).sub.a O[(CH.sub.2).sub.b O].sub.c [(CH.sub.2).sub.d O].sub.e (H.sub.2).sub.f NH.sub.2 where a, b, d, and f are integers of at least 2, e is an integer of from 2 to 30, and c is 0 or an integer of from 2 to 30, and polyether glycols, said fibers comprised in said fibrous batt layer being fibers of 4 to 50 denier, and said fibers comprised in said base fabric being woolen yarns composed of fibers of 4 to 50 denier, multifilament yarns each filament of which has a fineness of 4 to 50 denier or monofilament yarns having a diameter of 0.1 to 0.8 mm.
Claim 3
Dependent Claim
37 words
A needled felt for papermaking use as claimed in claim 1, in which said fibrous batt layer and/or said base fabric further comprises fibers formed of the polyamide block copolymer and fibers formed of another polyamide resin.
Claim 4
Dependent Claim
51 words
A needled felt for papermaking use as claimed in claim 1, in which said fibrous batt layer is composed of a plurality of layers, an outermost layer of which comprises the fibers formed of the polyamide block copolymer and an inner layer of which comprises fibers formed of another polyamide resin.
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) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |