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US3754964A
Expired / Lapsed
US
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Process for the continuous optical brightening of acylated cellulose fibre material
Assignee: Novartis Corp
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Filing: 1971-02-26
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Granted: 1973-08-28
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Expires: 1991-02-26
Abstract
Abstract A process for the continuous optical brightening of incompletely and completely acylated cellulose fiber material comprising impreganting the material with a solution of at least on optical brightener in a non-aqueous solution of a water-soluble organic solvent which solution also contains at least 80 percent by volume of a water-insoluble organic solvent.
Inventors
- 👤 M Seuret
- 👤 W Leutenegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:07
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/90; D06L; D06L4/00; D06L4/60; D06L4/607; D06L4/664
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
22 words
A process as defined in claim 1, wherein said water-soluble solvent is cyclic carboxylic acid amide having four to eight carbon atoms.
Claim 2
Dependent Claim
31 words
A process as defined in claim 1, wherein said optical brightener is dissolved in a mixture consisting of 95 percent by volume of tetra-chloroethylene and 5 percent by volume of N-methylpyrrolidone.
Claim 3
Dependent Claim
15 words
A process as defined in claim 1, wherein said optical brightener is a phenyl coumarin.
Claim 4
Dependent Claim
29 words
A process as defined in claim 4, wherein said phenyl coumarin is selected from the group consisting of a 3-phenyl-7-(3''-alkyl-pyrazolyl-(1''))-coumarin, a 3-phenyl-7-(naphtho-(1'''',2'''' :4'' , 5'')-triazolyl-(2'')-coumarin and a 3-phenyl-7-(s-triazinylamino) -coumarin.
Claim 5
Dependent Claim
16 words
A process as defined in claim 1, wherein said optical brightener is an optically brightening pyrazoline.
Claim 6
Dependent Claim
36 words
A process as defined in claim 1, whErein the content of said water, insoluble solvent is from 90 to 99 percent by volume of the total volume of the mixture of water-soluble solvent and water-insoluble solvent.
Claim 7
Dependent Claim
13 words
A process as defined in claim 7, wherein said water-soluble solvent is N-alkylpyrrolidone.
Claim 8
Dependent Claim
13 words
A process as defined in claim 7, wherein said water-insoluble solvent is tetra-chloroethylene.
Claim 9
Dependent Claim
72 words
A process as defined in claim 7, wherein said water-soluble solvent is selected from benzyl alcohol, an aliphatic ketone, having 3 - 8 carbon atoms, cyclohexanone, dioxan, ethylenglycol monoalkylether having 3 - 8 carbon atoms, fatty acid amide having 1 - 10 carbon atoms, di-alkyl sulfoxide having 2 - 6 carbon atoms, pyridine, N-alkyl-pyrrolidone having 4 - 8 carbon atoms, hexaalkyl phosphoric triamide having 6 - 18 carbon atoms and ethylene carbonate.
Claim 10
Dependent Claim
34 words
A process as defined in claim 7, wherein said water-insoluble organic solvent is selected from the group consisting of benzene toluene, xylene, and a halogenated hydrocarbon having a boiling point between 70* and 150*C.
Claim 11
Dependent Claim
18 words
A process as defined in claim 7, wherein said water-insoluble organic solvent is a halogenated lower aliphatic hydrocarbon.
Claim 12
Dependent Claim
42 words
A process as defined in claim 7, wherein said water-insoluble organic solvent is selected from the group consisting of carbon tetrachloride, trichloroethylene, tetrachloroethylene, tetrachloroethane and dibromoethylene, and wherein said water-soluble solvent is cyclic carboxylic acid amide having 4 - 8 carbon atoms.
Claim 13
Dependent Claim
21 words
A process as defined in claim 7, wherein said incompletely acylated cellulose fiber material is cellulose 2 1/2 -acetate fiber material.
Claim 14
Dependent Claim
53 words
A process as defined in claim 7, wherein said excess solvent is removed from the impregnated fiber material at a temperature of from 30* - 100*C and in such amount as to leave in said material a liquid amount of about 30 to 150 percent calculated on the dry weight of said material.
Claim 15
Dependent Claim
63 words
A brightening liquor comprising an optical brightener, a water-soluble organic solvent boiling below 250*C, and at least 80 percent by volume calculated on the total volume of the resulting mixture of a water-insoluble organic solvent boiling below 250*C wherein the amount of said optical brightener ranges from about 0.01 to 10 percent by weight calculated on the total weight of the said 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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |