Patent US3713857A successfully refreshed from Google Patents.
US3713857A
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Phthalocyanine pigments
Assignee: Sun Chemical Corp
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Filing: 1971-02-25
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Granted: 1973-01-30
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Expires: 1991-02-25
Abstract
Abstract Organic pigments having improved heat stability and dispersibility are obtained by pasting the crude pigment with sulfuric acid in the presence of (a) a salt of an aromatic sulfonic acid or (b) free aromatic sulfonic acid plus sodium sulfate.
Inventors
- 👤 L Shapiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:17
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0017
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A process for producing organic pigments having improved heat stability and dispersibility which comprises the steps of (1) dissolving the crude pigment in sulfuric acid in the presence of (a) the sodium salt of alpHa-naphthalene sulfonic acid or (b) a mixture of alpha-naphthalene sulfonic acid and sodium sulfate, (2) diluting the mixture with water, and (3) recovering the improved pigment product.
Claim 2
Dependent Claim
61 words
A process for producing organic pigments having improved heat stability and dispersibility which comprises the steps of (1) dissolving the crude pigment in sulfuric acid in the presence of (a) the sodium salt of alpHa-naphthalene sulfonic acid or (b) a mixture of alpha-naphthalene sulfonic acid and sodium sulfate, (2) diluting the mixture with water, and (3) recovering the improved pigment product.
Claim 3
Dependent Claim
13 words
The process of claim 1 where the salt (a) is sodium alpha-naphthalene sulfonate.
Claim 4
Dependent Claim
24 words
The process of claim 1 where step (1) is carried out in the presence of a mixture of alpha-naphthalene sulfonic acid and sodium sulfate.
Claim 5
Dependent Claim
13 words
The process of claim 1 where the crude pigment is chlorine-free copper phthalocyanine.
Claim 6
Dependent Claim
14 words
The process of claim 1 where the crude pigment is a chlorinated copper phthalocyanine.
Claim 7
Dependent Claim
37 words
The process of claim 1 wherein the crude pigment is dissolved in sulfuric acid and subsequently mixed with (the sodium) a salt of alpha-naphthalene sulfonic acid or (b) a mixture of alpha-naphthalene sulfonic acid and sodium sulfate.
Claim 8
Dependent Claim
64 words
In a process for producing organic pigments having improved heat stability and dispersibility which comprises acid pasting the crude pigment, diluting the paste with water, and recovering the pigment product, the improvement which comprises pasting the crude pigment with sulfuric acid in the presence of (a) the sodium salt of alpha-naphthalene sulfonic acid or (b) a mixture of alpha-naphthalene sulfonic acid and sodium sulfate.
Claim 9
Dependent Claim
64 words
In a process for producing organic pigments having improved heat stability and dispersibility which comprises acid pasting the crude pigment, diluting the paste with water, and recovering the pigment product, the improvement which comprises pasting the crude pigment with sulfuric acid in the presence of (a) the sodium salt of alpha-naphthalene sulfonic acid or (b) a mixture of alpha-naphthalene sulfonic acid and sodium sulfate.
Claim 10
Dependent Claim
26 words
The improvement of claim 7 wherein the ratio of the total amount of acid to the amount of crude pigment is about 5:1 to 12: 1.
Claim 11
Dependent Claim
26 words
The improvement of claim 7 wherein the ratio of the total amount of acid to the amount of crude pigment is about 7:1 to 10: 1.
Claim 12
Dependent Claim
32 words
The improvement of claim 7 wherein the amount of acid used in the process is about 5 to 12 parts by weight per part of the sodium salt of alpha-naphthalene sulfonic acid.
References Cited (Backward Citations)
US2367519A
Cited
US3150150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |