US3980428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing process
Assignee: Sandoz AG
•
Filing: 1973-10-31
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Granted: 1976-09-14
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Expires: 1993-10-31
Abstract
Abstract The present invention relates to a process for dyeing or printing organic substrates in the presence of lactone, the amount of which is sufficient to adjust the pH value of the dyeing or printing medium from a neutral or basic value to a value from 4.0 to 6.5.
Inventors
- 👤 Sergio Fabbri
- 👤 Josef Frauenknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:11
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/04; D; D06; D06P; D06P1/00; D06P1/44; D06P1/673; D06P1/67333; D06P1/6735; D06P1/67366; D06P1/96; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241; D06P3/242; D06P3/26; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/921; Y10S8/922; Y10S8/924; Y10S8/927; Y10S8/928
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A process which comprises dyeing or printing a natural or synthetic organic substance with a dyeing or printing medium comprising a member selected from the group consisting of acid dyes and mixtures of acid dyes with metal complex, disperse, reactive or basic dyes to which has been added between 0.1 and 1 part per thousand, based on the dyeing or printing medium, of a lactone derived from an aliphatic hydroxy carboxylic acid to adjust the pH from a neutral or basic value to a value from 4.0 to 6.5.
Claim 2
Dependent Claim
89 words
A process which comprises dyeing or printing a natural or synthetic organic substance with a dyeing or printing medium comprising a member selected from the group consisting of acid dyes and mixtures of acid dyes with metal complex, disperse, reactive or basic dyes to which has been added between 0.1 and 1 part per thousand, based on the dyeing or printing medium, of a lactone derived from an aliphatic hydroxy carboxylic acid to adjust the pH from a neutral or basic value to a value from 4.0 to 6.5.
Claim 3
Dependent Claim
24 words
A process according to claim 1, in which the lactone is the internal condensation product of an α-hydroxy-, β-hydroxy-, γ-hydroxy or δ-hydroxy carboxylic acid.
Claim 4
Dependent Claim
54 words
A process according to claim 1, in which the lactone is of formula I, ##EQU3## in which each of R 1 and R 2 , which may be the same or different, signifies a hydrogen atom or an alkyl radical of 1 to 8 carbon atoms, and n is 1, 2, 3 and 4.
Claim 5
Dependent Claim
35 words
A process according to claim 3, in which the lactone is derived from glycolic acid, lactic acid, γ-hydroxybutyric acid, β-hydroxypropionic acid, γ-hydroxybutyric acid, γ-hydroxyvaleric acid or γ-hydroxy derivatives of caproic, heptylic, caprylic or pelargonic acid.
Claim 6
Dependent Claim
12 words
A process according to claim 4, in which the lactone is γ-butyrolactone.
Claim 7
Dependent Claim
34 words
A process according to claim 1, in which the amount of lactone added to the dyeing or printing medium is from 0.5 to 0.7 parts per thousand based on the dyeing or printing medium.
Claim 8
Dependent Claim
34 words
A process according to claim 1, in which the lactone is added to a basic dyeing medium which basic dyeing medium has a pH value of from 7.5 to 11 and contains a basifier.
Claim 9
Dependent Claim
22 words
A process according to claim 1, in which the lactone is added to the dyeing or printing medium simultaneously with a basifier.
Claim 10
Dependent Claim
23 words
A process according to claim 7, in which the ratio of basifier to lactone is within the range of from 1:4 to 4:1.
Claim 11
Dependent Claim
16 words
A process according to claim 9, in which the ratio of basifier to lactone is 1:1.
Claim 12
Dependent Claim
23 words
A process according to claim 8, in which the ratio of basifier to lactone is within the range of from 1:4 to 4:1.
Claim 13
Dependent Claim
16 words
A process according to claim 11, in which the ratio of basifier to lactone is 1:1.
Claim 14
Dependent Claim
34 words
A process according to claim 1, in which the substrate comprises natural or synthetic polyamides, basic modified polyamides, acid dyeable polyesters, cellulose-21/2- acetate, cellulose triacetate, polypropylene, polyacrylonitrile and basic modified polyacrylonitrile or blends thereof.
Claim 15
Dependent Claim
14 words
A process according to claim 13, in which the substrate is a differential polyamide.
Claim 16
Dependent Claim
17 words
A process according to claim 14, in which the substrate is in fibre, fabric or yarn form.
Claim 17
Dependent Claim
33 words
A process according to claim 1, in which the amount of lactone added to the dyeing or printing medium is sufficient to adjust the pH value to a value from 5 to 6.
Claim 18
Dependent Claim
31 words
A process according to claim 1 wherein dyeing is carried out for a short time in a basic dye liquor and the lactone is added subsequently to exhaust the dye liquor.
Claim 19
Dependent Claim
35 words
A process according to claim 1 wherein a basifier is added, dyeing is carried out for a short time in a basic dye liquor and the lactone is added subsequently to exhaust the dye liquor.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |