US4352705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of leatherlike sheet materials
Assignee: Teijin Ltd
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Filing: 1981-07-02
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Granted: 1982-10-05
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Expires: 2001-07-02
Abstract
Abstract A process for the preparation of leatherlike sheet materials which comprises: preparing hollow composite fibers, each composed of 32 to 72 alternately arranged segments of polyester or polyamide and polystyrene which are mutually adhered side-by-side and encompass a hollow space, and which extend along the longitudinal axis of the fiber to form a tubular body, the hollow composite fiber having a denier of 1 to 20, and each segment having a denier of 0.01 to 0.5; forming a fabric using thus prepared hollow composite fibers; removing the polystyrene segments with a solvent thereof from the hollow composite fibers; and applying an elastic polymer to the fabric. The resultant leatherlike sheet materials have fine touch, excellent repulsive elasticity and excellent wrinkle resistance similar to natural suede. The hollow ratio (ratio by volume of the hollow space to the sum of the volume of the polyester or polyamide segments, the polystyrene segments and the hollow space) is 2-15%.
Inventors
- 👤 Kiyotaka Ozaki
- 👤 Michikage Matsui
- 👤 Norihiro Minemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:15
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/36; D06; D06N; D06N3/00; D06N3/0002; D06N3/0004; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
A process for the preparation of leatherlike sheet materials which comprises the steps of: (1) preparing hollow composite fibers, each composed of 32 to 72 alternately arranged segments of polyester or polyamide and polystyrene which are mutually adhered side-by-side and encompass a hollow space, and which extend along the longitudinal axis of the fiber to form a tubular body, said hollow composite fiber having a denier of 1 to 20, and said each segment having a denier of 0.01 to 0.5, the ratio of the total weight of the polyester or polyamide segments to that of the polystyrene segments in the hollow composite fiber being in the range of between 50:50 and 70:30 and the hollow ratio of the hollow composite fiber being between 2 and 15% by volume; (2) forming a fabric using thus prepared hollow composite fibers; (3) removing the polystyrene segments with a solvent thereof from the hollow composite fibers; and (4) applying an elastic polymer to the fabric.
Claim 2
Dependent Claim
162 words
A process for the preparation of leatherlike sheet materials which comprises the steps of: (1) preparing hollow composite fibers, each composed of 32 to 72 alternately arranged segments of polyester or polyamide and polystyrene which are mutually adhered side-by-side and encompass a hollow space, and which extend along the longitudinal axis of the fiber to form a tubular body, said hollow composite fiber having a denier of 1 to 20, and said each segment having a denier of 0.01 to 0.5, the ratio of the total weight of the polyester or polyamide segments to that of the polystyrene segments in the hollow composite fiber being in the range of between 50:50 and 70:30 and the hollow ratio of the hollow composite fiber being between 2 and 15% by volume; (2) forming a fabric using thus prepared hollow composite fibers; (3) removing the polystyrene segments with a solvent thereof from the hollow composite fibers; and (4) applying an elastic polymer to the fabric.
Claim 3
Dependent Claim
12 words
The process according to claim 1, wherein the polyester is polyethylene terephthalate.
Claim 4
Dependent Claim
15 words
The process according to claim 1, wherein the polyamide is nylon 6 or nylon 66.
Claim 5
Dependent Claim
13 words
The process according to claim 1, wherein the fabric is a woven fabric.
Claim 6
Dependent Claim
35 words
The process according to claim 4, wherein said polyethylene terephthalate has an intrinsic viscosity between 0.4 to 1.2 measured at 35° C. in o-chlorophenol and said polystyrene has a melt index between 10 to 20.
Claim 7
Dependent Claim
13 words
The process according to claim 1, wherein the fabric is a knitted fabric.
Claim 8
Dependent Claim
13 words
The process according to claim 1, wherein the fabric is a non-woven fabric.
Claim 9
Dependent Claim
60 words
The process according to claim 1, wherein the process of applying an elastic polymer to the fabric comprises applying an aqueous solution or emulsion of hydroscopic and heat-active urethane pre-polymer having an isocyanate group blocked by bisulfate to the fabric, and then heat-treating the applied fabric at a temperature of 100° to 180° C. to form polyurethane in the fabric.
Claim 10
Dependent Claim
51 words
The process according to claim 1, wherein the process of forming a fabric using the hollow composite fibers is followed by the process of applying an elastic polymer to the fabric and thereafter the process of removing polystyrene segments with a solvent thereof from the hollow composite fibers in the fabric.
Claim 11
Dependent Claim
17 words
The process according to claim 1, wherein said each segment has a denier of 0.05 to 0.3.
Claim 12
Dependent Claim
32 words
The process accordiang to claim 10, wherein said polyester or polyamide has a melt viscosity of 1,000 to 3,500 poises and said polystyrene has a melt viscosity of 500 to 1,500 poises.
Claim 13
Dependent Claim
32 words
The process according to claim 1, wherein said hollow composite fiber consists of 32 segments, 16 of which are polyester segments and 16 of which are polystyrene segments, encompassing said hollow space.
Claim 14
Dependent Claim
17 words
The process according to claim 12, wherein the denier of each segment is between 0.05 to 0.3.
Claim 15
Dependent Claim
31 words
The process according to claim 1, wherein said polyester segments and polystyrene segments are drawn at a draw ratio between 2 to 5 at a temperature between 40° to 130° C.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |