US4135877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving antistatic and hygroscopic properties of fibers or fibrous structures made thereof
Assignee: Kanebo Ltd
•
Filing: 1977-10-31
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Granted: 1979-01-23
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Expires: 1997-10-31
Abstract
Abstract A novel process for imparting durable antistatic and hygroscopic properties together with an excellent hand to fibers comprised of a high polymer having active hydrogen atoms in its molecule or fibrous structures made thereof is provided. The process is performed by heat treating such fibers or fibrous structures in the presence of a treating solution comprising at least one water-soluble vinyl monomer, acid and water. When the fibers impregnated with the solution are heated, the water-soluble vinyl monomers are graft polymerized with the fibers. The fibers are considered to act as a polymerization initiator, so that the graft polymerization reaction according to the present invention, different from conventional processes, can be effected without the aid of any polymerization initiators such as persulfates or peroxides.
Inventors
- 👤 Akira Aikawa
- 👤 Masao Oguchi
- 👤 Toshihide Takeda
- 👤 Akio Kisaichi
- 👤 Toshio Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:50
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/08; D06M14/12; Y; Y10; Y10S; Y10S8/00; Y10S8/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
134 words
A process for improving the antistatic and hygroscopic properties of polyamide fibers or fibrous structures made thereof, which comprises heating polyamide fiber or fibrous structure made thereof at a temperature of from 95° to 130° C. while in contact with an aqueous treating solution consisting essentially of from 0.02 to 10% by weight of at least one water-soluble vinyl monomer selected from the group consisting of N,N'-methylene-bis-acrylamide and triacryloyl hexahydrotriazine, from 0.05 to 3.0% by weight of at least one acid selected from the group consisting of formic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, acetic acid, tartaric acid and oxalic acid, and the balance is essentially water, said treating solution being free of polymerization initiator, whereby to graft polymerize said vinyl monomer with said polyamide.
Claim 2
Dependent Claim
134 words
A process for improving the antistatic and hygroscopic properties of polyamide fibers or fibrous structures made thereof, which comprises heating polyamide fiber or fibrous structure made thereof at a temperature of from 95° to 130° C. while in contact with an aqueous treating solution consisting essentially of from 0.02 to 10% by weight of at least one water-soluble vinyl monomer selected from the group consisting of N,N'-methylene-bis-acrylamide and triacryloyl hexahydrotriazine, from 0.05 to 3.0% by weight of at least one acid selected from the group consisting of formic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, acetic acid, tartaric acid and oxalic acid, and the balance is essentially water, said treating solution being free of polymerization initiator, whereby to graft polymerize said vinyl monomer with said polyamide.
Claim 3
Dependent Claim
33 words
A process as claimed in claim 1 in which, in said heating step, said polyamide fiber or fibrous structure made thereof is soaked in a bath of said treating solution at said temperature.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1 in which said polyamide fiber or fibrous structure made thereof is padded with said treating solution and then is steamed at said temperature.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 1 in which said vinyl monomer consists of N,N'-methylene-bis-acrylamide.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 4 in which said acid is formic acid.
Claim 7
Dependent Claim
29 words
A process as claimed in claim 1, wherein the amount of the water-soluble vinyl monomer is 0.03 to 5% by weight based on the weight of the treating solution.
Claim 8
Dependent Claim
27 words
A process as claimed in claim 1, wherein the amount of the acid is 0.1 to 1.0% by weight based on the weight of the treating solution.
Claim 9
Dependent Claim
18 words
A process as claimed in claim 1, wherein the heating is conducted for 40 minutes to 5 hours.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 1, wherein the heating is conducted for 1 to 3 hours.
Claim 11
Dependent Claim
34 words
A process as claimed in claim 2, wherein the heating is conducted at bath ratio of not exceeding 1/15, wherein bath ratio is the weight ratio of said fiber or fibrous structure/said treating solution.
Claim 12
Dependent Claim
16 words
A process as claimed in claim 10, wherein the bath ratio ranges from 1/20 to 1/200.
Claim 13
Dependent Claim
43 words
A process as claimed in claim 3, wherein the fiber or fibrous structure is padded and squeezed so that the amount of treating solution picked up is from 20 to 200% by weight, based on the weight of the fiber or fibrous structure.
Claim 14
Dependent Claim
24 words
A process as claimed in claim 1, which further comprises a step of washing the fiber or fibrous article with water after the heating.
Claim 15
Dependent Claim
12 words
A product manufactured according to a process as claimed in claims 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |