US3904544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of optical brightening agents
Assignee: Novartis AG
•
Filing: 1972-09-27
•
Granted: 1975-09-09
•
Expires: 1992-09-27
Abstract
Abstract The present invention provides a process in which a slurry is prepared containing optical brighteners from the distilbene, pyrazoline, coumarine and triazolyl-stilbene series, by mixing the wet filter-cake obtained during the preparation of these compounds with such quantity dispersing agent and/or electrolyte that the resultant slurry is thixotropic and, therefore, has reduced tendency to settle out on static storage and has a Brookfield viscosity at equilibrium from 2,000 to 10,000 centipoise at 6 revolutions per minute, 1,000 to 3,500 centipoise at 12 revolutions per minute and up to 2,000 centipoise at 60 revolutions per minute.
Inventors
- 👤 David Ronald Clark
- 👤 Thomas Gerald Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0073; B01J13/0082; C; C09; C09B; C09B67/00; C09B67/0071; D; D06; D06L; D06L4/00; D06L4/60; D06L4/664
Claims Analysis
Total Claims: 62
Claim 1
Independent Claim
30 words
AN AQUEOUS PROCESS IN WHICH A THIXOTROPIC SLURRY IS PREPARED CONTAINING FROM 15% TO 60% BY WEIGHT BASED ON THE TOTAL WEIGHT OF SLURRY OF A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
30 words
AN AQUEOUS PROCESS IN WHICH A THIXOTROPIC SLURRY IS PREPARED CONTAINING FROM 15% TO 60% BY WEIGHT BASED ON THE TOTAL WEIGHT OF SLURRY OF A COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
15 words
A process according to claim 1, in which is used a compound of formula IV.
Claim 4
Dependent Claim
17 words
A process according to claim 1, in which is used a compound of formula II or III.
Claim 5
Dependent Claim
48 words
A process according to claim 1, in which is used a compound of formula IV, wherein X1 is the sulphonic acid radical or its sodium salt X2is hydrogen or chlorine, X3 is the sulphonic acid radical or its sodium salt or chlorine and X4 is hydrogen or chlorine.
Claim 6
Dependent Claim
14 words
A process according to claim 1, in which is used a compound of formula
Claim 7
Dependent Claim
36 words
A process according to claim 1, in which is used a compound of formula V, wherein the grouping A1 is a sodium sulphonic acid radical or chlorine atom and its grouping A2 is a hydrogen atom.
Claim 8
Dependent Claim
14 words
A process according to claim 1, in which is used the compound of formula
Claim 9
Dependent Claim
14 words
A process according to claim 1, in which is used the compound of formula
Claim 10
Dependent Claim
32 words
A process according to claim 1, in which the proportion of the optical brightener present in the slurry is from 20% to 45% by weight based on the weight of the slurry.
Claim 11
Dependent Claim
26 words
A process according to claim 1 in which the surface active agent is the sodium salt of the condensation product of naphthalene sulphonic acid and formaldehyde.
Claim 12
Dependent Claim
27 words
A process according to claim 1 in which 0.1 to 2.0 by weight of the wet filter cake of a gelling agent is added to the slurry.
Claim 13
Dependent Claim
14 words
A process according to claim 11, in which the gelling agent is magnesium silicate.
Claim 14
Dependent Claim
48 words
A process according to claim 1 in which there is added to the slurry from 4% to 25% by weight based on the total weight of the slurry of the strong electrolyte of the group consisting of sodium chloride, sodium sulphate, sodium carbonate or the corresponding potassium salts.
Claim 15
Dependent Claim
13 words
A process according to claim 13, in which the electrolyte is sodium chloride.
Claim 16
Dependent Claim
16 words
A process according to claim 1, in which the slurry is subjected to a grinding treatment.
Claim 17
Dependent Claim
33 words
A process according to claim 1, in which the Brookfield viscosity is from 2,000 to 5,000 centipoise at 6 revolutions per minute and from 50 to 1000 centipoise at 60 revolutions per minute.
Claim 18
Dependent Claim
21 words
An aqueous process in which a slurry is prepared, containing from 10% to 40% by weight of a compound of formula
Claim 19
Dependent Claim
21 words
An aqueous process in which a slurry is prepared, containing from 10% to 40% by weight of a compound of formula
Claim 20
Dependent Claim
28 words
A process according to claim 17, in which is used a compound of formula VIII, wherein A is a benzene radical and R a sodium sulphonic acid radical.
Claim 21
Dependent Claim
25 words
A process according to claim 17, in which the surface-active agent is the sodium salt of the condensation product of naphthalene sulphonic acid and formaldehyde.
Claim 22
Dependent Claim
31 words
A process according to claim 17, in which 0.1% to 2.0% by weight based on the weight of the wet filter cake of a gelling agent is added to the slurry.
Claim 23
Dependent Claim
14 words
A process according to claim 17, in which the gelling agent is magnesium silicate.
Claim 24
Dependent Claim
51 words
A process according to claim 17, in which there is added to the slurry from 4% to 25% by weight of a strong electrolyte based on the total weight of slurry of an electrolyte selected from the group consisting of sodium chloride, sodium sulphate, sodium carbonate or the corresponding potassium salts.
Claim 25
Dependent Claim
16 words
A process according to claim 17, in which the slurry is subjected to a grinding treatment.
Claim 26
Dependent Claim
22 words
A process according to claim 17, in which the Brookfield viscosity is from 2,000 to 5,000 centipoise at 6 revolutions per minute.
Claim 27
Dependent Claim
29 words
An aqueous process in which a slurry is prepared containing from 15% to 60% by weight based on the total weight of slurry of a compound having the formula
Claim 28
Dependent Claim
29 words
An aqueous process in which a slurry is prepared containing from 15% to 60% by weight based on the total weight of slurry of a compound having the formula
Claim 29
Dependent Claim
33 words
A process according to claim 25, in which the proportion of compound of formula IX present in the slurry is from 20% to 45% by weight based on the weight of the slurry.
Claim 30
Dependent Claim
22 words
A process according to claim 25, in which the electrolyte is added as an aqueous solution containing from 5% to 10% electrolyte.
Claim 31
Dependent Claim
29 words
A process according to claim 25, in which the electrolyte present in the final slurry is from 0.5% to 2% by weight based on the total weight of slurry.
Claim 32
Dependent Claim
16 words
A process according to claim 25, in which the slurry is subjected to a grinding treatment.
Claim 33
Dependent Claim
33 words
A process according to claim 25, in which the Brookfield viscosity is from 2000 to 5000 centipoise at 6 revolutions per minute and from 50 to 1000 centipoise at 60 revolutions per minute.
Claim 34
Dependent Claim
25 words
An aqueous thixotropic slurry containing (a) from 15% to 60% by weight based on the total weight of slurry of a compound having the formula:
Claim 35
Dependent Claim
25 words
An aqueous thixotropic slurry containing (a) from 15% to 60% by weight based on the total weight of slurry of a compound having the formula:
Claim 36
Dependent Claim
17 words
A thixotropic slurry according to claim 31, characterized by a content of a compound having formula IV.
Claim 37
Dependent Claim
19 words
A thixotropic slurry according to claim 31, characterized by a content of a compound of formula II or III.
Claim 38
Dependent Claim
16 words
A thixotropIc slurry according to claim 31, characterized by a content of a compound of formula
Claim 39
Dependent Claim
51 words
A thixotropic slurry according to claim 31, characterized by a content of a compound of formula IV, wherein X1 is the sulphonic acid radical or its sodium salt, X2 is hydrogen or chlorine, X3 is the sulphonic acid radical or its sodium salt or chlorine and X4 is hydrogen or chlorine.
Claim 40
Dependent Claim
17 words
A thixotropic slurry according to claim 31, characterised by a content of a compound having the formula:
Claim 41
Dependent Claim
40 words
A thixotropic slurry according to claim 31, characterised by a content of a compound of the formula V, in which the grouping A1 is a sodium sulphonic acid radical or chlorine atom and the grouping A2 is a hydrogen atom.
Claim 42
Dependent Claim
17 words
A thixotropic slurry according to claim 31, characterised by the content of the compound of the formula
Claim 43
Dependent Claim
16 words
A thixotropic slurry according to claim 31, characterised by the content of the compound of formula
Claim 44
Dependent Claim
30 words
A thixotropic slurry according to claim 31, characterised by a content of from 20% to 45% by weight of an optical brightener based on the total weight of the slurry.
Claim 45
Dependent Claim
26 words
A thixotropic slurry according to claim 31, in which the surface-active agent is the sodium salt of the condensation product of naphthalene sulphonic acid and formaldehyde.
Claim 46
Dependent Claim
29 words
A thixotropic slurry according to claim 31, wherein the Brookfield viscosity is from 2000 to 5,000 centipoises at 6 r.p.m. and from 50 to 1,000 centipoises at 60 r.p.m.
Claim 47
Dependent Claim
30 words
A thixotropic slurry according to claim 31, characterised by a content of from 0.1% to 2.0% by weight based on the total weight of a gelling agent of the slurry.
Claim 48
Dependent Claim
14 words
A thixotropic slurry according to claim 43, wherein the gelling agent is magnesium silicate.
Claim 49
Dependent Claim
31 words
An aqueous thixotropic slurry, characterised by: a. a content of from 10% to 40% by weight based on the total weight of the slurry of an optical brightener having the formula
Claim 50
Dependent Claim
31 words
An aqueous thixotropic slurry, characterised by: a. a content of from 10% to 40% by weight based on the total weight of the slurry of an optical brightener having the formula
Claim 51
Dependent Claim
36 words
A thixotropic slurry according to claim 45, characterised by: a. a content of an optical brightener of the formula VIII, in which the grouping A is a benzene radical and R a sodium sulphonic acid radical.
Claim 52
Dependent Claim
26 words
A thixotropic slurry according to claim 46, in which the surface-active agent is the sodium salt of the condensation product of naphthalene sulphonic acid and formaldehyde.
Claim 53
Dependent Claim
20 words
A thixotropic slurry according to claim 45, wherein the Brookfield viscosity is from 2000 to 5,000 centipoise at 6 r.p.m.
Claim 54
Dependent Claim
30 words
A thixotropic slurry according to claim 45, characterised by a content of a gelling agent of from 0.1% to 2.0% by weight based on the weight of the wet filter-cake.
Claim 55
Dependent Claim
14 words
A thixotropic slurry according to claim 45, wherein the gelling agent is magnesium silicate.
Claim 56
Dependent Claim
29 words
A thixotropic slurry according to claim 45, characterised by the content of 4% to 25% by weight of a strong electrolyte based on the total weight of the slurry.
Claim 57
Dependent Claim
31 words
An aqueous thixotropic slurry, characterised by: a. a content of from 15% to 60% by weight based on the total weight of the slurry of the optical brightener having the formula
Claim 58
Dependent Claim
31 words
An aqueous thixotropic slurry, characterised by: a. a content of from 15% to 60% by weight based on the total weight of the slurry of the optical brightener having the formula
Claim 59
Dependent Claim
30 words
A thixotropic slurry according to claim 52, characterised by a content of from 20% to 45% by weight based on the total weight of the slurry of the optical brightener.
Claim 60
Dependent Claim
23 words
A thixotropic slurry according to claim 52, in which the electrolyte is sodium chloride, sodium sulphate, sodium carbonate or the corresponding potassium salts.
Claim 61
Dependent Claim
29 words
A thixotropic slurry according to claim 52, wherein the Brookfield viscosity is from 2000 to 5,000 centipoise at 6 r.p.m. and from 50 to 1,000 centipoise at 60 r.p.m.
Claim 62
Dependent Claim
29 words
A thixotropic slurry according to claim 52, characterised by a content of the electrolyte of from 0.5% to 2.0% by weight based on the total weight of the slurry.
References Cited (Backward Citations)
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |