Patent US5479197A successfully refreshed from Google Patents.
US4386966A
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Copper phthalocyanine pigment process
Assignee: Artience Co Ltd
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Filing: 1981-12-14
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Granted: 1983-06-07
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Expires: 2001-12-14
Abstract
Abstract Premilled semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine is slurried and stirred with sulfuric acid (50-60% and preferably 55-59% in the case of semichloro copper phthalocyanine and 50-61% and preferably 58-61% in the case of partially sulfonated semichloro copper phthalocyanine) at 50°-85° C., preferably 65°-75° C. for 1/2 to 4 hours. The slurry is diluted with to less than 35% sulfuric acid concentration and stirred at 60°-95° C. for 1/2 to 4 hours. The resulting highly transparent pigment is filtered and dried.
Inventors
- 👤 Patrick H. Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:26
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017; C09B67/0019
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A process comprising premilling a crude semichloro copper phthalocyanine or a crude partially sulfonated semichloro copper phthalocyanine, forming a slurry of the premilled material in an aqueous solution of sulfuric acid of 50 to 60 percent by weight strength in the case of semichloro copper phthalocyanine or of 50 to 61 percent by weight strength in the case of partially sulfonated semichloro copper phthalocyanine, stirring the slurry while maintaining its temperature at from 50° to 85° C. for from 1/2 to 4 hours, diluting the slurry with water to less than 35 weight percent sulfuric acid in water, stirring the diluted slurry at from 60° to 95° C. for from 1/2 to 4 hours and recovering pigmentary grade semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine.
Claim 2
Dependent Claim
127 words
A process comprising premilling a crude semichloro copper phthalocyanine or a crude partially sulfonated semichloro copper phthalocyanine, forming a slurry of the premilled material in an aqueous solution of sulfuric acid of 50 to 60 percent by weight strength in the case of semichloro copper phthalocyanine or of 50 to 61 percent by weight strength in the case of partially sulfonated semichloro copper phthalocyanine, stirring the slurry while maintaining its temperature at from 50° to 85° C. for from 1/2 to 4 hours, diluting the slurry with water to less than 35 weight percent sulfuric acid in water, stirring the diluted slurry at from 60° to 95° C. for from 1/2 to 4 hours and recovering pigmentary grade semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein semichloro copper phthalocyanine is being treated.
Claim 4
Dependent Claim
21 words
The process of claim 2 wherein the aqueous slurry is formed using from 55 to 59 percent by weight sulfuric acid.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the initial sulfuric acid slurry is maintained at from 65° to 75° C.
Claim 6
Dependent Claim
27 words
The process of claim 4 wherein the weight ratio of aqueous solution of sulfuric acid to semichloro phthalocyanine in the initial slurry is from 4.5 to 5.1/1.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein partially sulfonated semichloro copper phthalocyanine is being treated.
Claim 8
Dependent Claim
21 words
The process of claim 6 wherein the aqueous slurry is formed using from 58 to 61 percent by weight sulfuric acid.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the initial sulfuric acid slurry is maintained at 65° to 75° C.
Claim 10
Dependent Claim
23 words
The process of claim 8 wherein the weight ratio of sulfuric acid to partially sulfonated semichloro copper phthalocyanine is from 4.5 to 5.5/1.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |