Patent US4028161A successfully refreshed from Google Patents.
US4028161A
Expired / Lapsed
US
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Method of making sheet material
Assignee: Kuraray Co Ltd
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Filing: 1974-10-29
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Granted: 1977-06-07
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Expires: 1994-10-29
Abstract
Abstract A sheet material having leather-like grain, excellent scuffing and abrasion resistance and superior dyeability comprising in combination, a substrate, and intermediate layer of 0.05 to 2.5 mm thickness consisting of a finely napped porous polymer bonded to said substrate and an upper layer consisting of a polymeric coating of thickness ranging from 1-100 microns. In typical embodiments, the upper layer may be a polymeric coating material such as linear or cross-linked polyurethanes, the intermediate layer may be a porous polyester, polyamide, vinyl or elastomeric polymer, e.g. a polyurethane, and the substrate may be a woven or non-woven fabric. In preparation of this sheet material, the intermediate layer is pressed and condensed to about 10 to 90% to a density of from about 0.20 to 0.50 g/cc.
Inventors
- 👤 Osamu Fukushima
- 👤 Kazuo Nagoshi
- 👤 Toshiaki Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; D; D06; D06N; D06N3/00; D06N3/0002; D06N3/004; D06N3/0043; D06N3/0045; D06N3/0054; D06N3/007; D06N3/0075; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23914; Y10T428/2395; Y10T428/23979; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/31504; Y10T428/31551; Y10T428/31554
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
A process for producing a sheet material having leather-like grain, excellent scuffing and abrasion resistance and superior dyeability, comprising: forming a finely napped porous polymeric layer having a thickness of about 0.05 to 2.50 mm, a density of about 0.10 to 0.30 g/cc and a nap length of about 0.03 to 0.5 mm, on a fibrous substrate, said layer containing minute pores of about 0.1 to 100 microns in diameter; treating the finely napped porous polymeric layer with a nap binding agent of the group consisting of a swelling agent for the polymer of the napped porous polymeric layer, solution of a polymer dissolved in the swelling agent and a two-liquid type curable polyurethane elastomer; compressing the finely napped porous polymeric layer by about 10 to 90% of its original thickness by means of even pressure in order to obtain a layer having a desinty of from 0.20 to 0.50 g/cc; and, overcoating the resultant compressed material with an upper layer consisting of a non-porous polymeric coating having a thickness of 1 to 100 microns.
Claim 2
Dependent Claim
175 words
A process for producing a sheet material having leather-like grain, excellent scuffing and abrasion resistance and superior dyeability, comprising: forming a finely napped porous polymeric layer having a thickness of about 0.05 to 2.50 mm, a density of about 0.10 to 0.30 g/cc and a nap length of about 0.03 to 0.5 mm, on a fibrous substrate, said layer containing minute pores of about 0.1 to 100 microns in diameter; treating the finely napped porous polymeric layer with a nap binding agent of the group consisting of a swelling agent for the polymer of the napped porous polymeric layer, solution of a polymer dissolved in the swelling agent and a two-liquid type curable polyurethane elastomer; compressing the finely napped porous polymeric layer by about 10 to 90% of its original thickness by means of even pressure in order to obtain a layer having a desinty of from 0.20 to 0.50 g/cc; and, overcoating the resultant compressed material with an upper layer consisting of a non-porous polymeric coating having a thickness of 1 to 100 microns.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein the nap binding agent is a swelling agent for the polymer of the napped porous polymeric layer.
Claim 4
Dependent Claim
21 words
The process of claim 2 in which the upper layer has a lamina structure of at least two or more laminae.
Claim 5
Dependent Claim
16 words
The process of claim 3 in which the bottom lamina consists of a cross-linked polyurethane elastomer.
Claim 6
Dependent Claim
30 words
The process of claim 1 wherein the nap binding agent is a solution of a polymer dissolved in a swelling agent for the polymer of the napped porous polymeric layer.
Claim 7
Dependent Claim
21 words
The process of claim 5 in which the upper layer has a lamina structure of at least two or more laminae.
Claim 8
Dependent Claim
16 words
The process in claim 6 in which the bottom lamina consists of a cross-linked polyurethane elastomer.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein the nap binding agent is a two-liquid type curable polyurethane elastomer.
Claim 10
Dependent Claim
21 words
The process of claim 8 in which the upper layer has a lamina structure of at least two or more laminae.
Claim 11
Dependent Claim
16 words
The process of claim 9 in which the bottom lamina consists of a cross-linked polyurethane elastomer.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |