Patent US4923732A successfully refreshed from Google Patents.
US4923732A
Expired / Lapsed
US
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Leather, in particular split leather provided with a dressing as a process and apparatus for producing dressed leather
Assignee: Microplastic Rop
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Filing: 1989-08-14
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Granted: 1990-05-08
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Expires: 2009-08-14
Abstract
Abstract A dressed leather is provided at least on one side with depressions and have on this side absorbent protruding fibres. At this side the leather is bonded with a layer formed of an aqueous dispersion of synthetic plastics material, said layer fills the depressions and completely receives the protruding fibres and forms at least a part of the dressing, which dressing is provided with a structured surface at the side turned away from the leather. Preferably, the dressing consists of two layers, the inner layer, which is adjacent the leather and completely receives the protruding fibres, is formed of the aqueous dispersion of synthetic plastics material and the outer layer, which has the structured surface, consists of an aqueous dispersion of synthetic plastics material or of a liquid solution of synthetic plastics material.
Inventors
- 👤 Philipp Schaefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:21
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/12; B05D1/00; B05D1/28; B05D1/286; C; C14; C14C; C14C11/00; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24438; Y10T428/249921; Y10T428/249953; Y10T428/249955; Y10T428/249958; Y10T428/25; Y10T428/26; Y10T428/266; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/3158; Y10T428/31855; Y10T428/31931; Y10T428/4935
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A dressed leather provided at least on one side with depressions and having on said one side absorbent protruding fibers and being bonded at this side with a layer formed from an aqueous dispersion of synthetic plastics material, said layer filling the depressions and completely receiving the protruding fibers and forming at least part of a dressing, said dressing being provided with a structured surface at the side turned away from the leather, the dressing consisting of an inner layer which is adjacent the leather and completely receives the protruding fibers, and which is formed from the aqueous dispersion of synthetic plastics material, and an outer layer which has the structured surface and is formed from an aqueous dispersion of synthetic plastics material, the inner layer having a greater thickness and lesser density than the outer layer, the thickness of the inner layer being greater than 0.11 mm, the thickness of the outer layer being smaller than 0.10 mm, and at least the inner layer having a pore structure or foam structure, respectively, and a reinforcement in at least one of the layers.
Claim 2
Dependent Claim
183 words
A dressed leather provided at least on one side with depressions and having on said one side absorbent protruding fibers and being bonded at this side with a layer formed from an aqueous dispersion of synthetic plastics material, said layer filling the depressions and completely receiving the protruding fibers and forming at least part of a dressing, said dressing being provided with a structured surface at the side turned away from the leather, the dressing consisting of an inner layer which is adjacent the leather and completely receives the protruding fibers, and which is formed from the aqueous dispersion of synthetic plastics material, and an outer layer which has the structured surface and is formed from an aqueous dispersion of synthetic plastics material, the inner layer having a greater thickness and lesser density than the outer layer, the thickness of the inner layer being greater than 0.11 mm, the thickness of the outer layer being smaller than 0.10 mm, and at least the inner layer having a pore structure or foam structure, respectively, and a reinforcement in at least one of the layers.
Claim 3
Dependent Claim
57 words
A leather as claimed in claim 1, wherein the inner layer located adjacent the leather is made neutral with respect to color relative to the leather and relative to the outer layer comprising the structured surface and wherein pigments or, respectively, dye stuffs are incorporated into the outer layer and define the color shade of the dressing.
Claim 4
Dependent Claim
19 words
A leather as claimed in claim 1 wherein the thickness of the inner layer is greater than 0.21 mm.
Claim 5
Dependent Claim
50 words
A leather as claimed in claim 3 wherein at least in the inner layer there are embedded hollow microspheres having a diameter between 0.008 and 0.10 mm, the microspheres having thin shells consisting of a vinylidenechloride copolymer, the inner layer containing more than 8 percent by volume of hollow microspheres.
Claim 6
Dependent Claim
29 words
A leather as claimed in claim 3 wherein the inner layer has a density between 0.6 and 0.8 and the outer layer has a density between 0.82 and 1.24.
Claim 7
Dependent Claim
30 words
A leather as claimed in claim 1 wherein the reinforcement consists of a textile material or fleece having a weight per unit area of less than 80 g/m 2 .
Claim 8
Dependent Claim
23 words
A leather as claimed in claim 3 wherein the structured surface of the outer layer is provided with an additional thin finish layer.
Claim 9
Dependent Claim
24 words
A leather as claimed in claim 3 wherein the structured surface of the outer layer has the appearance of a finely ground, full-grain leather.
Claim 10
Dependent Claim
17 words
A leather as claimed in claim 3 wherein at least the outer layer contains finest cellulose particles.
Claim 11
Dependent Claim
16 words
A leather as claimed in claim 3 wherein at least the outer layer contains heat-sensible substances.
Claim 12
Dependent Claim
15 words
A leather as claimed in claim 10 wherein at least the outer layer contains polyvinylmethylether.
Claim 13
Dependent Claim
25 words
A leather as claimed in claim 3 which has, together with the dressing, a permeability for water vapor of more than 0.3 mg/cm 2 .
References Cited (Backward Citations)
US4330597A
Cited
US4581261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |