US4426421A
Expired / Lapsed
US
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Multilayer composite sheet useful as a substrate for artificial leather
Assignee: Asahi Kasei Corp
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Filing: 1982-03-29
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Granted: 1984-01-17
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Expires: 2002-03-29
Abstract
Abstract A multilayer composite sheet useful as a substrate for artificial leather, comprises at least three fibrous layers, namely, a superficial layer (A) consisting of a spun-laid web composed of extremely fine fibers having an average denier of 0.5 or less and three-dimensionally entangled with each other; and intermediate layer (B) consisting of a web of staple fibers having a length of 50 mm or less and entangled together; and a base layer (C) consisting of a woven or knitted fabric, the above-mentioned three fibrous layers being superimposed on each other and combined together in such a manner that a portion of the fibers in each layer penetrates into the adjacent layers and becomes entangled three-dimensionally with the fibers in the adjacent layers.
Inventors
- 👤 Kenji Nakamae
- 👤 Tsukasa Shima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:38
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; B32B5/02; B32B5/022; B32B5/024; B32B5/026; B32B5/06; D; D04; D04H; D04H1/00; D04H1/40; D04H1/44; D04H1/46; D04H1/492; D04H1/498; D04H1/54; D04H1/56; D04H3/00; D04H3/08; D04H3/16; D06; D06N; D06N3/00; D06N3/0002; D06N3/0004; D06N3/0006; D06N3/0009; D06N3/0011; D06N3/0013; D06N3/0015; D06N3/0036; D06N3/12; D06N3/14; B32B2437/00; D06N2209/00; D06N2209/08; D06N2209/0807; D06N2209/0823; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T442/00; Y10T442/30; Y10T442/3707; Y10T442/3724; Y10T442/3732; Y10T442/40; Y10T442/494
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
A multilayer composite sheet useful as a substrate for artificial leather, comprising at least three fibrous layers, namely, a superficial layer (A) consisting of spun-laid extremely fine fibers having an average denier of 0.5 or less, which fine fibers are three dimensionally entangled with each other, thereby forming a body of a non-woven fibrous layer; an intermediate layer (B) consisting of synthetic staple fibers having a length of 50 mm or less, which staple fibers are entangled with each other to form a body of a non-woven layer; and a base layer (C) consisting of a woven or knitted fabric, said superficial layer (A), said intermediate layer (B) and said base layer (C) being superimposed together in the above-mentioned order and being subjected to needle-punching or water-stream-ejecting under high pressure thereby to form a composite sheet wherein a portion of the fibers in each non-woven fibrous layer penetrates into the inside of the adjacent layers and said penetrated fibers become entangled with the fibers in the adjacent layers.
Claim 2
Dependent Claim
168 words
A multilayer composite sheet useful as a substrate for artificial leather, comprising at least three fibrous layers, namely, a superficial layer (A) consisting of spun-laid extremely fine fibers having an average denier of 0.5 or less, which fine fibers are three dimensionally entangled with each other, thereby forming a body of a non-woven fibrous layer; an intermediate layer (B) consisting of synthetic staple fibers having a length of 50 mm or less, which staple fibers are entangled with each other to form a body of a non-woven layer; and a base layer (C) consisting of a woven or knitted fabric, said superficial layer (A), said intermediate layer (B) and said base layer (C) being superimposed together in the above-mentioned order and being subjected to needle-punching or water-stream-ejecting under high pressure thereby to form a composite sheet wherein a portion of the fibers in each non-woven fibrous layer penetrates into the inside of the adjacent layers and said penetrated fibers become entangled with the fibers in the adjacent layers.
Claim 3
Dependent Claim
25 words
The composite sheet as claimed in claim 1, wherein said extremely fine synthetic fibers in said superficial layer (A) are produced by a melt-blow method.
Claim 4
Dependent Claim
24 words
The composite sheet as claimed in claim 1, wherein said intermediate layer (B) is produced by a paper-forming procedure and a subsequent entangling procedure.
Claim 5
Dependent Claim
104 words
The composite sheet as claimed in claim 1, wherein a back surface layer (D), consisting of synthetic staple fibers entangled together and having a length of 50 mm or less, is placed on the lower surface of the base layer (C) and is incorporated into said three fibrous layers, in such a manner that a portion of the fibers in the back surface layer (D) penetrates into the base layer (C) or into the other non-woven fibrous layers through the base layer (C) and said penetrated fibers become entangled with the fibers in the base layer (C) or in the other non-woven fibrous layers.
Claim 6
Dependent Claim
25 words
The composite sheet as claimed in claim 4, wherein said back surface layer (D) is produced by a paper-forming procedure and a subsequent entangling procedure.
References Cited (Backward Citations)
US4146663A
Cited
GB1585632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |