Patent US4097782A successfully refreshed from Google Patents.
US4033718A
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Photoactivated bleaching process
Assignee: Procter and Gamble Co
•
Filing: 1975-09-08
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Granted: 1977-07-05
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Expires: 1995-09-08
Abstract
Abstract Detergent compositions containing particular species of sulfonated zinc phthalocyanine were found to be unexpectedly effective bleach photoactivators for removing stains from textiles. These species are principally tri- and tetra-sulfonates, especially the latter, with minor amounts of di-sulfonates permitted.
Inventors
- 👤 Thomas Charles Holcombe
- 👤 Robert Howard Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:01
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/0005; C11D3/0063; C11D3/395; C11D3/3955; D; D06; D06L; D06L4/00; D06L4/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A process for removing stains from textiles which comprises treating the textiles, in the presence of visible light and oxygen, with an aqueous solution containing: (a) a concentration of from 78 milligrams per liter to 1,440 milligrams per liter of an anionic surfactant; (b) a concentration of from 215 milligrams per liter to 2,140 milligrams per liter of an alkaline builder salt; and (c) a concentration of from 0.25 milligrams per liter to 125 milligrams per liter of a bleach photoactivator which is a mixture of sulfonated zinc phthalocyanine species in which the relative densitometer values (RDV's) of the various sulfonated zinc phthalocyanine species in the mixture are: ______________________________________
Specie RDV
______________________________________
unsulfonated 0
monosulfonated
0
disulfonated 0-15
trisulfonated plus
tetrasulfonated
(100)-(RDV for disulfonated)
______________________________________
Claim 2
Dependent Claim
125 words
A process for removing stains from textiles which comprises treating the textiles, in the presence of visible light and oxygen, with an aqueous solution containing: (a) a concentration of from 78 milligrams per liter to 1,440 milligrams per liter of an anionic surfactant; (b) a concentration of from 215 milligrams per liter to 2,140 milligrams per liter of an alkaline builder salt; and (c) a concentration of from 0.25 milligrams per liter to 125 milligrams per liter of a bleach photoactivator which is a mixture of sulfonated zinc phthalocyanine species in which the relative densitometer values (RDV's) of the various sulfonated zinc phthalocyanine species in the mixture are: ______________________________________
Specie RDV
______________________________________
unsulfonated 0
monosulfonated
0
disulfonated 0-15
trisulfonated plus
tetrasulfonated
(100)-(RDV for disulfonated)
______________________________________
Claim 3
Dependent Claim
28 words
The process of claim 1 in which the concentration of the mixture of sulfonated zinc phthalocyanine species is from 1 milligram per liter to 20 milligrams per liter.
Claim 4
Dependent Claim
51 words
The process of claim 1 in which the RDV's of the sulfonated zinc phthalocyanine species in the mixture of sulfonated zinc phthalocyanine species used therein are: ______________________________________
Specie RDV
______________________________________
unsulfonated : 0
monosulfonated : 0
disulfonated : 0-4
tetrasulfonated
: 64-94
trisulfonated : (100)-(RDV for disulfonated)-
(RDV for tetrasulfonated).
______________________________________
Claim 5
Dependent Claim
48 words
The process of claim 1 in which the RDV's of the sulfonated zinc phthalocyanine species in the mixture of sulfonated zinc phthalocyanine species used therein are: ______________________________________
Specie RDV
______________________________________
unsulfonated : 0
monosulfonated : 0
disulfonated : 0
tetrasulfonated
: 84-94
trisulfonated : (100)-(RDV for
tetrasulfonated)
______________________________________
Claim 6
Dependent Claim
26 words
The process of claim 1 in which the mixture of sulfonated zinc phthalocyanine species used therein is prepared by direct sulfonation of zinc phthalocyanine with oleum.
Claim 7
Dependent Claim
28 words
The process of claim 3 in which the concentration of the mixture of sulfonated zinc phthalocyanine species is from 1 milligram per liter to 20 milligrams per liter.
Claim 8
Dependent Claim
28 words
The process of claim 4 in which the concentration of the mixture of sulfonated zinc phthalocyanine species is from 1 milligram per liter to 20 milligrams per liter.
Claim 9
Dependent Claim
28 words
The process of claim 5 in which the concentration of the mixture of sulfonated zinc phthalocyanine species is from 1 milligram per liter to 20 milligrams per liter.
References Cited (Backward Citations)
ZA723212B
Cited
GB1372035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |