Patent US3900608A successfully refreshed from Google Patents.
US3900608A
Expired / Lapsed
US
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Preparations of optical brighteners
Assignee: Bayer AG
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Filing: 1972-10-20
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Granted: 1975-08-19
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Expires: 1992-10-20
Abstract
Abstract Preparations of optical brighteners, for the whitening of fiber materials and coating mixtures for paper, which contain the solution of a dispersion brightener (a) in such a colourless organic liquid (b) which is immiscible with water, the boiling point of which is above 150*C and in which the brightener exhibits a minimum solubility of 0.3 g per litre at room temperature, with the solution optionally also containing an emulsifier (c); furthermore a process for the whitening of fiber materials and coating mixtures for paper wherein said solutions are applied.
Inventors
- 👤 Hubert Dierkes
- 👤 Karl Schonol
- 👤 Joachim Walter
- 👤 Friedhelm Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:18
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/636; D06L4/664
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A PROCESS FOR WHITENING OF FORMED FIBER MATERIALS CONSISTING ESSENTIALLY OF TREATING THE FORMED FIBERS AT TEMPERATURES OF FROM 20*-40*C WITH A WHITENER LIQUOR WHICH CONSISTS ESSENTIALLY OF (1) A SOLUTION OF A DISPERSION BRIGHTENER IN AN ORGANIC SOLVENT WHICH IS A WATER IMMISCIBLE LIQUID HAVING A BOILING POINT ABOVE 150*C AND IN WHICH THE WHITENER HAS A MINIMUM SOLUBILITY AT ROOM TEMPERATURE OF 0.3 GRAMS PER LITRE WHEREIN THE DISPERSION BRIGHTENER IS SELECTED FROM THE CLASS CONSISTING OF NAPHTHALIC ACID IMIDES, STYRYL-TRIAZOLES, DISTYRYL DERIVATIVES, PYRAZOLOQUINOLINES PYRENES, BENZOXAZOLES, PYRAZOLINES, CARBOSTYRILS, AND COUMARINES, AND WHEREIN THE ORGANIC SOLVENT IS SELECTED FROM THE CLASS CONSISTING OF HIGH BOILING ETHERS, PHOSPHORIC ACID ESTERS, MONOCARBOXYLIC ACID ESTERS, HYDROXY CARBOXYLIC ACID ESTERS, ALKANESULFONIC ACID ARYL ESTERS, ACETALS, EPOXIDIZED FATTY ACIDS, POLYMERIC ESTERS, ALKYLBENZENES AND DICARBOXYLIC ACID ESTERS, IN (II) A MEMBER SELECTED FROM THE GROUP CONSISTING OF AQUEOUS LIQUORS CONTAINING AN EMULSIFIER FOR THE COMPOSITION (I) OR A WATER IMMISCIBLE ORGANIC SOLVENT.
Claim 2
Dependent Claim
157 words
A PROCESS FOR WHITENING OF FORMED FIBER MATERIALS CONSISTING ESSENTIALLY OF TREATING THE FORMED FIBERS AT TEMPERATURES OF FROM 20*-40*C WITH A WHITENER LIQUOR WHICH CONSISTS ESSENTIALLY OF (1) A SOLUTION OF A DISPERSION BRIGHTENER IN AN ORGANIC SOLVENT WHICH IS A WATER IMMISCIBLE LIQUID HAVING A BOILING POINT ABOVE 150*C AND IN WHICH THE WHITENER HAS A MINIMUM SOLUBILITY AT ROOM TEMPERATURE OF 0.3 GRAMS PER LITRE WHEREIN THE DISPERSION BRIGHTENER IS SELECTED FROM THE CLASS CONSISTING OF NAPHTHALIC ACID IMIDES, STYRYL-TRIAZOLES, DISTYRYL DERIVATIVES, PYRAZOLOQUINOLINES PYRENES, BENZOXAZOLES, PYRAZOLINES, CARBOSTYRILS, AND COUMARINES, AND WHEREIN THE ORGANIC SOLVENT IS SELECTED FROM THE CLASS CONSISTING OF HIGH BOILING ETHERS, PHOSPHORIC ACID ESTERS, MONOCARBOXYLIC ACID ESTERS, HYDROXY CARBOXYLIC ACID ESTERS, ALKANESULFONIC ACID ARYL ESTERS, ACETALS, EPOXIDIZED FATTY ACIDS, POLYMERIC ESTERS, ALKYLBENZENES AND DICARBOXYLIC ACID ESTERS, IN (II) A MEMBER SELECTED FROM THE GROUP CONSISTING OF AQUEOUS LIQUORS CONTAINING AN EMULSIFIER FOR THE COMPOSITION (I) OR A WATER IMMISCIBLE ORGANIC SOLVENT.
Claim 3
Dependent Claim
23 words
The process according to claim 1, wherein the aqueous whitener liquor additionally contains a compound which is able to absorb the organic liquid.
Claim 4
Dependent Claim
104 words
Process of claim 2 wherein the whitener liquor contains an absorbing agent selected from the group consisting of polyvinylacetate; polyacrylic acid esters, acrylic acid esters, styrene copolymers, copolymers from maleic acid anhydrides and olefines; self cross-linking copolymers from 0.5-10% by weight of an olefinically unsaturated monomer with at least one hydrophilic group, 0.5-15% by weight of a methylol ether and/or a Mannich base of acrylic or methacrylic acid amide and at least one further oelfinically unsaturated mOnomer which is capable of copolymerizing with and; plastics based on polyethercyclohexane-polyethylene or polyurethanes; starch or starch derivatives; cellulose derivatives or long chain alkyl amines or their derivatives.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |