US3953167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dyeing fibers or fabrics of aromatic polyamides
Assignee: Teijin Ltd
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Filing: 1974-07-16
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Granted: 1976-04-27
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Expires: 1994-07-16
Abstract
Abstract Aromatic polyamide fibers or fabrics are dyed in a deep and brilliant color with good light fastness by impregnating the fibers or fabrics with (a) a cationic dye, (b) an aliphatic hydroxy compound having a boiling point of at least 180°C., (c) at least one swelling agent selected from o-phenylphenol, p-phenylphenol, benzophenone, α-naphthol and β-naphthol and (d) at least one of alkali metal salts or ammonium salts of inorganic or organic acids, the amount of the salt being 1 to 10% by weight based on the sum total of the amounts of (a), (b), (c) and (d), and then heat-treating the fibers or fabrics with steam.
Inventors
- 👤 Norihiro Minemura
- 👤 Setsuo Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/242; D06P1/00; D06P1/44; D06P1/64; D06P1/651; D06P1/65106; D06P1/653; D06P1/673; D06P1/67333; D06P1/6735; D06P1/90; D06P1/92; D06P1/928; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924; Y10S8/925
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A process for dyeing aromatic polyamide fibers or fabrics, which comprises impregnating aromatic polyamide fibers or fabrics with (a) a cationic dye, (b) an aliphatic hydroxy compound having a boiling point of at least 180°C., (c) at least one swelling agent selected from the group consisting of o-phenylphenol, p-phenylphenol, benzophenone, β-naphthol and α-naphthol and (d) at least one of alkali metal salts or ammonium salts of inorganic or organic acids, the amount of said salt (d) being 1 to 10% by weight based on the sum total of the amounts of the dye (a), the hydroxy compound (b), the swelling agent (c) and the salt (d); and then heat-treating said fibers or fabrics with steam.
Claim 2
Dependent Claim
115 words
A process for dyeing aromatic polyamide fibers or fabrics, which comprises impregnating aromatic polyamide fibers or fabrics with (a) a cationic dye, (b) an aliphatic hydroxy compound having a boiling point of at least 180°C., (c) at least one swelling agent selected from the group consisting of o-phenylphenol, p-phenylphenol, benzophenone, β-naphthol and α-naphthol and (d) at least one of alkali metal salts or ammonium salts of inorganic or organic acids, the amount of said salt (d) being 1 to 10% by weight based on the sum total of the amounts of the dye (a), the hydroxy compound (b), the swelling agent (c) and the salt (d); and then heat-treating said fibers or fabrics with steam.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said salt (d) is sodium nitrate, potassium nitrate, ammonium nitrate, sodium chloride, potassium chloride or ammonium chloride.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein the amount of said salt (d) is 3 to 10% by weight of the sum total of the amounts of the dye, aliphatic hydroxy compound, swelling agent and salt.
Claim 5
Dependent Claim
41 words
The process of claim 1 wherein the amount of said swelling agent (c) is 5 to 50% by weight based on the sum total of the amounts of the dye (a), aliphatic hydroxy compound (b), swelling agent (c) and salt (d).
Claim 6
Dependent Claim
41 words
The process of claim 1 wherein the amount of the swelling agent (c) is 5 to 15% by weight based on the sum total of the amounts of the dye (a), aliphatic hydroxy compound (b), swelling agent (c) and salt (d).
Claim 7
Dependent Claim
33 words
The process of claim 1 wherein said aromatic polyamide fibers or fabrics are impregnated with a mixture consisting essentially of the cationic dye, the swelling agent, the salt and the aliphatic hydroxy compound.
Claim 8
Dependent Claim
41 words
The process of claim 1 wherein said aromatic polyamide fibers or fabrics are impregnated with an aqueous solution of the dye, dried, and then impregnated with a mixture consisting essentially of the swelling agent, the salt and the aliphatic hydroxy compound.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein said aliphatic hydroxy compound (b) is ethylene glycol or propylene glycol.
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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |