US4289698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent stable copper phthalocyanine blue pigments
Assignee: BASF Corp
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Filing: 1980-01-03
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Granted: 1981-09-15
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Expires: 2000-01-03
Abstract
Abstract A process for producing stable copper phthalocyanine blue pigment in the alpha form. Copper phthalocyanine blue crystals are ground to produce a powder. The powder is contacted with chlorine and mixed with sulfuric acid. The pigment-sulfuric acid mixture is then mixed with water.
Inventors
- 👤 James D. Stepp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:40
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0032; C09B47/00; C09B47/04; C09B47/08; C09B47/10; C09B67/0001; C09B67/0017; C09B67/0019
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
A process for producing stable copper phthalocyanine blue pigment in the alpha form comprising grinding copper phthalocyanine blue crystals to produce a powder, contacting the powder with chlorine and mixing the chlorinated pigment with sulfuric acid.
Claim 2
Dependent Claim
36 words
A process for producing stable copper phthalocyanine blue pigment in the alpha form comprising grinding copper phthalocyanine blue crystals to produce a powder, contacting the powder with chlorine and mixing the chlorinated pigment with sulfuric acid.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the mixture of said pigment and sulfuric acid is mixed with water.
Claim 4
Dependent Claim
88 words
The process of claim 2 wherein the weight ratio of chlorine to copper phthalocyanine blue powder is about 0.03:1 to 0.2:1, the chlorination time ranges from about one-fourth to three hours, said sulfuric acid is an aqueous solution of from about 60 to 90 weight percent H 2 SO 4 , the weight ratio of aqueous sulfuric acid to chlorinated pigment is about 3:1 to 10:1 and the weight ratio of sulfuric acid to water in the pigment, sulfuric acid, water mixture is from about 1:5 to 1:50.
Claim 5
Dependent Claim
60 words
The process of claim 3 wherein the mixture of copper phthalocyanine pigment and sulfuric acid is allowed to stand for about one-half to 6 hours before mixing with water, and said mixture with water is heated to a temperature of from about 50° and 100° C. for one-half to four hours, the product is filtered washed until neutral and dried.
Claim 6
Dependent Claim
16 words
The process of claim 4 wherein said copper phthalocyanine blue is acid washed prior to grinding.
Claim 7
Dependent Claim
14 words
The process of claim 4 wherein said grinding is performed in a ball mill.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein said copper phthalocyanine blue is acid washed prior to grinding.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |