Patent US3790341A successfully refreshed from Google Patents.
US3790341A
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Method of dyeing polymers containing nitrile groups and articles made of same
Assignee: Individual
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Filing: 1970-01-12
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Granted: 1974-02-05
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Expires: 1990-01-12
Abstract
Abstract A method of dyeing polymers containing nitrile groups and articles made from such polymers so as to impart colors thereto ranging from yellow to brown, according to which sulfur is introduced into said polymers and articles made therefrom by treating them with an aqueous solution of hydrosulfuric acid or salts thereof in a neutral medium with a subsequent treatment of said polymers and articles in a weakly acidic medium. Further treatment with a metal salt capable of forming a chelate with the sulfhydryl groups in the dyed polymer imparts decay-resistance, light-fastness, thermal stability and hydrophobic properties.
Inventors
- 👤 I Kalontarov
- 👤 E Repina
- 👤 K Makhkamov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:37
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/0076; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/927
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
14 words
A method as claimed in claim 1, wherein the sulfur compound is sodium sulfide.
Claim 2
Dependent Claim
43 words
A method as claimed in claim 1, wherein the treatment of the polymer with the aqueous solution of the sulfur compound is carried out in a neutral medium at a pH of 7-7.5 which is maintained by the introduction of a phosphate buffer.
Claim 3
Dependent Claim
15 words
A method as claimed in claim 3, wherein the phosphate buffer is monobasic potassium phosphate.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1, wherein the treatment of the polymer with the aqueous solution of the sulfur compound is carried out at a temperature of 60-100* C.
Claim 5
Dependent Claim
21 words
A method as claimed in claim 5, wherein the tratment with said solutions is effected at a temperature of 70*-80* C.
Claim 6
Dependent Claim
33 words
A method as claimed in claim 1 wherein sulfur is introduced into the polymer in an amount not less than 2.5 wt. percent, thereby imparting a yellow to orange color to the polymer.
Claim 7
Dependent Claim
33 words
A method as claimed in claim 1 wherein sulfur is introduced into the polymer in an amount not less than 8 wt percent, thereby imparting an orange to brown color to the polymer.
Claim 8
Dependent Claim
21 words
A method as claimed in claim 1 wherein the weakly acidic medium is a 3 percent aqueous solution of sulfuric acid.
Claim 9
Independent Claim
131 words
A method of dyeing a polymer containing nitrile groups and selected from the group consisting of polyacrylonitrile, cyanoethylated cellulose, cyanoethylated polyvinyl alcohol, and graft polymers of polyacrylonitrile with cellulose, polyvinyl alcohol or polyamide polymers in a color ranging from yellow to brown which consists essentially of treating said polymer with a solution consisting essentially of a substantiallly neutral aqueous solution containing at least 3 peRcent by weight of a sulfur compound selected from the group consisting of hydrosulfuric acid, ammonium sulfide and alkali metal sulfides so as to introduce sulfur in the form of sulfhydryl groups into the polymer and then treating the sulfhydrated polymer with a weakly acidic medium having a pH of 4 to 6, followed by treating the dyed polymer with steam at a temperature of 100*-105* C.
Claim 10
Independent Claim
142 words
A method of dyeing a polymer containing nitrile groups and selected from the group consisting of polyacrylonitrile, cyanoethylated cellulose, cyanoethylated polyvinyl alcohol, and graft copolymers of polyacrylonitrile with cellulose, polyvinyl alcohol or polyamide polymers in a color ranging from yellow to brown which consists essentially of treating said polymer with a solution consisting essentially of a substantially neutral aqueous solution containing at least 3 percent by weight of a sulfur compound selected from the group consisting of hydrosulfuric acid, ammonium sulfide and alkali metal sulfides so as to introduce sulfur in the form of sulfhydryl groups into the polymer and then treating the sulfhydrated polymer with a weakly acidic medium having a pH of 4 to 6 followed by treating the dyed polymer with an aqueous solution of a salt of a metal selected from the group consisting of copper and nickel.
Claim 11
Dependent Claim
16 words
A method as claimed in claim 11, wherein the salt is a salt of bivalent copper.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |