US4309316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of washing powders of stabilized or enhanced appearance which contain fluorescent whitening agents
Assignee: BASF Corp
•
Filing: 1979-12-10
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Granted: 1982-01-05
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Expires: 1999-12-10
Abstract
Abstract The invention relates to the production of washing powders of stabilized or enhanced appearance which contain a fluorescent whitening agent of the formula ##STR1## or of the formula ##STR2## wherein R 1 is hydrogen or chlorine, and M is hydrogen, an alkali metal or ammonium ion. The stabilizing or enhancement of the appearance is effected by first dissolving or dispersing the fluorescent whitening agent in a mixture of water and a polyvinyl alcohol or polyvinyl pyrrolidone which is soluble or is able to swell in water, adding this solution or dispersion to the washing powder slurry and drying the slurry. The solution or dispersion can also be subsequently sprayed onto the dried residual washing powder. The appearance can be further enhanced by employing a polyethylene glycol, a surfactant containing ethyleneoxy and/or propyleneoxy groups, and/or a cellulose ether, in addition to the polymer in the solution or dispersion. The solution or dispersion comprising fluorescent whitening agent and polymer can also alternatively be dried, preferably by spray drying, to produce a preparation which, after it has been suspended in water, can also be added to the washing powder slurry. The slurry is then dried, preferably by spray drying.
Inventors
- 👤 Burkhart Lange
- 👤 Suresh C. Agarwal
- 👤 Werner Fringeli
- 👤 Franz Gunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:26
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/40; C11D3/42
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
168 words
A process for the production of a washing powder of stabilized or enhanced appearance which contains one or more fluorescent whitening agents of the formula ##STR7## or of the formula ##STR8## wherein R 1 is hydrogen or chlorine, and M is hydrogen, an alkali metal, ammonium or amine salt ion, which process comprises first dissolving or dispersing the fluorescent whitening agent or agents in a mixture of water and a polyvinyl alcohol or polyvinyl pyrrolidone polymer which is soluble or swellable in water, wherein the ratio of fluorescent whitening agent or agents to polymer in the aqueous solution or dispersion, or in the dry powder obtained therefrom, is 9:1 to 1:10, and adding the solution or dispersion so obtained, which may additionally contain a polyethylene glycol, a surfactant containing ethyleneoxy and/or propyleneoxy groups, or a cellulose ether, to the washing powder slurry and subsequently drying this slurry, or, optionally after the addition of further washing powder components, spraying said solution or dispersion onto a dried unfinished washing powder.
Claim 2
Dependent Claim
168 words
A process for the production of a washing powder of stabilized or enhanced appearance which contains one or more fluorescent whitening agents of the formula ##STR7## or of the formula ##STR8## wherein R 1 is hydrogen or chlorine, and M is hydrogen, an alkali metal, ammonium or amine salt ion, which process comprises first dissolving or dispersing the fluorescent whitening agent or agents in a mixture of water and a polyvinyl alcohol or polyvinyl pyrrolidone polymer which is soluble or swellable in water, wherein the ratio of fluorescent whitening agent or agents to polymer in the aqueous solution or dispersion, or in the dry powder obtained therefrom, is 9:1 to 1:10, and adding the solution or dispersion so obtained, which may additionally contain a polyethylene glycol, a surfactant containing ethyleneoxy and/or propyleneoxy groups, or a cellulose ether, to the washing powder slurry and subsequently drying this slurry, or, optionally after the addition of further washing powder components, spraying said solution or dispersion onto a dried unfinished washing powder.
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein the solution or dispersion containing the fluorescent whitening agent is added direct to the washing powder slurry and subsequently drying said slurry by spray drying.
Claim 4
Dependent Claim
25 words
A process according to claim 1, which comprises wet grinding the dispersion before it is incorporated in the detergent slurry or before it is dried.
Claim 5
Dependent Claim
32 words
A process according to claim 3, wherein the wet grinding procedure is carried out in a ball mill in the temperature range between room temperature and the boiling point of the dispersion.
Claim 6
Dependent Claim
53 words
A process according to claim 1, which comprises dissolving or dispersing the fluorescent whitening agent in a mixture of water and a polyvinyl alcohol having a degree of hydrolysis of 80 to 100% and a viscosity between 3 and 66 cP, or a polyvinyl pyrrolidone having a molecular weight of 10,000 to 360,000.
Claim 7
Dependent Claim
22 words
A process according to claim 1, wherein the mixture of water and the polymer contains at least 0.01% by weight of polymer.
Claim 8
Dependent Claim
20 words
A process according to claim 1, wherein the ratio of fluorescent whitening agent to polyvinyl alcohol is 80:20 to 40:50.
Claim 9
Dependent Claim
67 words
A process according to claim 1, wherein the mixture of water and polyvinyl alcohol or polyvinyl pyrrolidone, in which the fluorescent whitening agent is dissolved or dispersed, additionally contains a polyethylene glycol, a surfactant containing ethyleneoxy and/or propyleneoxy groups, or a cellulose ether, in an amount of 1 to 50 times the amount of polyvinyl alcohol or polyvinyl pyrrolidone, or mixtures thereof, present in the aqueous mixture.
Claim 10
Dependent Claim
25 words
A process according to claim 1, wherein the dissolving or dispersing of the fluorescent whitening agent in the aqueous polymer mixture is accelerated by heating.
Claim 11
Dependent Claim
27 words
A process according to claim 1, which comprises the use of a fluorescent whitening agent of the formula ##STR9## wherein M' is hydrogen, sodium, potassium or ammonium.
Claim 12
Dependent Claim
16 words
A process according to claim 4, wherein said temperature range is between 20° and 80° C.
Claim 13
Dependent Claim
165 words
A process according to claim 8, wherein said aqueous mixture contains a polyethylene glycol having a molecular weight between 100 and 10,000, a cellulose ether, a copolymer of polyethylene oxide and polypropylene oxide having a molecular weight of 2,000 to 20,000 of the formula HO(C.sub.2 H.sub.4 O).sub.x --(C.sub.3 H.sub.6 O).sub.y --(C.sub.2 H.sub.4 O).sub.z H wherein the content of ethylene oxide, x+z, is 10 to 85% by weight and the content of propylene oxide, y is 15 to 90% by weight, an ethoxylated alcohol of the formula H(OC.sub.2 H.sub.4).sub.a --OR wherein a is an integer between 10 and 200 and R is alkyl of 12 to 20 carbon atoms, alkenyl of 12 to 18 carbon atoms, or phenylalkyl, or an ethoxylated alkylphenol of the formula ##STR10## wherein R' is alkyl of 6 to 18 carbon atoms, Z is hydrogen, -SO 3 M' or --PO 3 M', in which M' is hydrogen, an alkali metal or ammonium ion, and b is an integer between 6 and 30.
Claim 14
Dependent Claim
13 words
A process according to claim 12, wherein a is between 30 and 100.
Claim 15
Dependent Claim
19 words
A process according to claim 9, wherein said heating is in temperature range of from 40° to 80° C.
Claim 16
Dependent Claim
16 words
A process according to claim 14, wherein the temperature range is from 60° to 80° C.
Claim 17
Dependent Claim
26 words
A process according to claim 1, which comprises the use of a fluorescent whitening agent of the formula ##STR11## wherein M' is hydrogen, sodium or potassium.
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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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |