US3899292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for crumpling synthetic suede
Assignee: Toray Industries Inc
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Filing: 1973-03-06
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Granted: 1975-08-12
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Expires: 1993-03-06
Abstract
Abstract Preparing suede-like leather sheet materials by passing a napped sheet with a fluid through a venturi-nozzle having a predetermined inner area. The sheet has naps of superfine denier fiber at least on one surface, and comprises (a) a non-woven fabric made up to 0.01-0.3 denier superfine staple fibers of breaking strength below 3 grams and an elongation at break of 60180 percent and (b) a polyurethane elastomer obtained by reacting a diol mixture by weight of about 20-40 parts of polycaprolactone diol of a molecular weight of about 1000-3000 and about 60-80 parts of polytetramethyleneetherglycol of a molecular weight of about 1000-3000 with an organic diisocyanate and a diamine chain extender.
Inventors
- 👤 Kaoru Okazaki
- 👤 Kenkichi Yagi
- 👤 Miyoshi Okamoto
- 👤 Koji Watanabe
- 👤 Toyohiko Hikota
- 👤 Masayoshi Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:56
CPC Classifications
D; D06; D06P; D06P7/00; D06P7/005; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; D06N; D06N3/00; D06N3/0002; D06N3/0056; D06N3/12; D06N3/14; D06P3/00; D06P3/82; D06P3/8204; D06P3/8214; Y; Y10; Y10S; Y10S8/00; Y10S8/929
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
52 words
A PROCESS FOR PREPARING SYNTHETIC SUEDE, SAID SUEDE COMPRISING A NAPPED NEEDLE-PUNCHED FIBRIC COMPRISING A MULTIPLICITY OF FIBERS OF SUPERFINE DENIER INTO WHICH POLYURETHANE IS IMPREGNATED, SAID PROCESS COMPRISING REPEATEDLY CRUMPLING SAID NAPPED SHEET BY PASSING IT TOGETHER WITH A DYE LIQUID THROUGH AN AREA OF REDUCED CROSS-SECTION ACCORDING TO THE RELATIONSHIPS:
Claim 2
Dependent Claim
52 words
A PROCESS FOR PREPARING SYNTHETIC SUEDE, SAID SUEDE COMPRISING A NAPPED NEEDLE-PUNCHED FIBRIC COMPRISING A MULTIPLICITY OF FIBERS OF SUPERFINE DENIER INTO WHICH POLYURETHANE IS IMPREGNATED, SAID PROCESS COMPRISING REPEATEDLY CRUMPLING SAID NAPPED SHEET BY PASSING IT TOGETHER WITH A DYE LIQUID THROUGH AN AREA OF REDUCED CROSS-SECTION ACCORDING TO THE RELATIONSHIPS:
Claim 3
Dependent Claim
34 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the flow rate of the fluid in said reduced area is in the range of about 20- 150 m/min.
Claim 4
Dependent Claim
35 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the napped sheet is passed with a fluid through a venturi opening at a temperature of about 80- 150* C.
Claim 5
Dependent Claim
30 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the napped sheet is passed through said reduced area repeatedly at least about 10 times.
Claim 6
Dependent Claim
38 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the ratio of polyurethane elastomer Weight to the nonwoven fabric weight in the napped sheet is in the range of about 20/100- 100/100.
Claim 7
Dependent Claim
24 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the denier of the superfine fiber is 0.05- 0.2.
Claim 8
Dependent Claim
22 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the superfine denier fiber is a polyethyleneterephthalate.
Claim 9
Dependent Claim
33 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 7 wherein the napped sheet passes with a fluid through a venturi opening at a temperature of 100* -140* C.
Claim 10
Dependent Claim
47 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein a superfine denier fiber is such fiber that is obtained by dissolving at least one component from a multi-component fiber with a solvent, said multi-component fiber comprising at least two different polymers.
Claim 11
Dependent Claim
49 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 9 wherein the multi-component fiber is an islands-in-a-sea type fiber which forms a fiber bundle when the soluble component is dissolved, said fiber bundle being formed by fine filaments which are continuous along the fiber axis.
Claim 12
Dependent Claim
32 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 9 wherein the multi-component fiber is a filament of an intimate mixture of two mutually incompatible fiber-forming organic polymers.
Claim 13
Dependent Claim
50 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the diol mixture comprises about 20- 35 parts of polycaprolactone diol having a molecular weight of about 1000 - 3000 and about 65- 80 parts of polytetramethyleneetherglycol having a molecular weight of about 1000- 3000.
Claim 14
Dependent Claim
22 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the organic diisocyanate is an aromatic diisocyanate.
Claim 15
Dependent Claim
20 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 13 wherein the aromatic diisocyanate is diphenylmethane-4,4''-diisocyanate.
Claim 16
Dependent Claim
23 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the diamine chain extender is an aromatic diamine.
Claim 17
Dependent Claim
20 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 15 wherein the aromatic diamine is 4,4''-diaminodiphenylmethane.
Claim 18
Dependent Claim
42 words
A process for crumpling synthetic suede leather sheet material as claimed in claim 1 wherein the organic diisocyanate is diphenyl methane-4,4''-diisocyanate and the diamine chain extender is 4,4''-diaminodiphenylmethane, and the structure of the polyurethane elastomer is shown in the formula as follows:
Claim 19
Dependent Claim
16 words
The method defined in claim 1 wherein said area of reduced cross-section is circular in shape.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |