US4367070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating fibrous structure
Assignee: Toray Industries Inc
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Filing: 1981-06-15
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Granted: 1983-01-04
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Expires: 2001-06-15
Abstract
Abstract A process for treating a fibrous structure is provided. The fibrous structure comprises at least two components at least one of which is a polyester containing an SO 3 M group wherein M represents hydrogen or an alkali metal. The process is characterized in that the fibrous structure is treated with an agent which deteriorates the polyester prior to the alkali treatment for the removal of the polyester component.
Inventors
- 👤 Kazuya Hayashi
- 👤 Masato Shimada
- 👤 Teruo Nakamura
- 👤 Yoshihiro Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:22
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/0002; D06N3/0004; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/38
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
83 words
In a process for treating a fibrous structure comprising a plurality of components, at least one of which is a polyester containing an SO 3 M group, wherein M represents hydrogen or a metal, the steps which comprise pre-treating the fibrous structure with a degrading agent for the SO 3 M group-containing polyester which preferentially degrades said SO 3 M group-containing polyester, thereby producing a fibrous structure capable of being treated in a subsequent alkali treatment step to produce a soft fibrous product.
Claim 2
Dependent Claim
83 words
In a process for treating a fibrous structure comprising a plurality of components, at least one of which is a polyester containing an SO 3 M group, wherein M represents hydrogen or a metal, the steps which comprise pre-treating the fibrous structure with a degrading agent for the SO 3 M group-containing polyester which preferentially degrades said SO 3 M group-containing polyester, thereby producing a fibrous structure capable of being treated in a subsequent alkali treatment step to produce a soft fibrous product.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein said degrading agent is an acid.
Claim 4
Dependent Claim
22 words
A process according to claim 1 wherein the fibrous structure is a mixture of two or more polyester fibers of different compositions.
Claim 5
Dependent Claim
22 words
A process according to claim 1, wherein the fibrous structure contains multi-component fibers comprising two or more polyester components of different compositions.
Claim 6
Dependent Claim
32 words
A process according to claim 4, wherein the multi-component fibers have a plurality of cores in the cross section thereof and the SO 3 M group-containing polyester is interposed between the cores.
Claim 7
Dependent Claim
19 words
A process according to claim 5, wherein the fibers have at least five cores in the cross section thereof.
Claim 8
Dependent Claim
19 words
A process according to claim 5 wherein the fibers have at least ten cores in the cross section thereof.
Claim 9
Dependent Claim
26 words
The process according to claim 1, wherein said SO 3 M group-containing polyester is polyethylene terephthalate copolymerized with 1-15 mol percent of 5-(sodium sulfo) isophthalic acid.
Claim 10
Dependent Claim
106 words
In a process for treating a fibrous structure to produce a product having improved softness and handle, said structure comprising a plurality of components at least one of which is a polyester the polymeric structure of which includes an SO 3 M group bonded to the polymeric structure, where M represents H or a metal selected from the group consisting of the alkali and alkaline earth metals, the steps which comprise: (a) degrading the SO 3 M group-containing polyester by treatment with an agent to lower the molecular weight of the polyester polymer, and (b) hydrolyzing the degraded polyester by contact treatment with an alkaline substance.
Claim 11
Dependent Claim
106 words
In a process for treating a fibrous structure to produce a product having improved softness and handle, said structure comprising a plurality of components at least one of which is a polyester the polymeric structure of which includes an SO 3 M group bonded to the polymeric structure, where M represents H or a metal selected from the group consisting of the alkali and alkaline earth metals, the steps which comprise: (a) degrading the SO 3 M group-containing polyester by treatment with an agent to lower the molecular weight of the polyester polymer, and (b) hydrolyzing the degraded polyester by contact treatment with an alkaline substance.
Claim 12
Dependent Claim
16 words
The process defined in claim 9, wherein step (b) is carried out at an elevated temperature.
Claim 13
Dependent Claim
13 words
The process defined in claim 9, wherein step (b) includes contact with steam.
Claim 14
Dependent Claim
31 words
The process defined in claim 9, wherein step (a) is carried out by contact with a degradation agent selected from the group consisting of amines, zinc salts, oxidizing agents and acids.
Claim 15
Dependent Claim
20 words
The process defined in claim 12, wherein the amines are selected from the group consisting of ethylenediamine, ethylenetriamine, and monoethanolamine.
Claim 16
Dependent Claim
24 words
The process defined in claim 12, wherein the zinc salts are selected from the group consisting of zinc chloride, zinc sulfate and zinc nitrate.
Claim 17
Dependent Claim
24 words
The process defined in claim 12, wherein the oxidizing agents are selected from the group consisting of hydrogen peroxide, sodium hypochlorite and sodium chlorite.
Claim 18
Dependent Claim
23 words
The process defined in claim 12, wherein the acids are selected from the group consisting of hydrochloric, sulfuric, nitric, phosphoric and oxalic acids.
References Cited (Backward Citations)
JPS4841477A
Cited
GB2026053A
Cited
US4291442A
Cited
JPS55116874A
Cited
JPS55142767A
Cited
US4270913A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |