Patent US4230855A successfully refreshed from Google Patents.
US4230855A
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US
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Method of preparation of improved nigrosine and indulino dyes
Assignee: BASF Italia SpA
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Filing: 1978-10-30
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Granted: 1980-10-28
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Expires: 1998-10-30
Abstract
Abstract Nigrosine and induline dyes having improved rheological properties are prepared by treating a base of the nigrosine or induline series with between 15 and 30% by weight of phthalic anhydride, at a temperature between 135 DEG and 150 DEG C. The resulting dyes are readily dispersible in plastics and inks and provide finished products having improved flowability.
Inventors
- 👤 Mario Capaccioni
- 👤 Laurentino Gentile
- 👤 Aldo Rusconi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:22
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0096; C09B17/00; C09B69/00; C09B69/02; C09B69/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
A process for preparing a nigrosine base or an induline base having improved dispersibility, fluidity and flowability in the coloring of plastics and in the preparation of inks, comprising treating a nigrosine base or induline base, at a temperature between 135° and 150° C., with between 15 and 30% by weight of phthalic anhydride, based on the weight of the base.
Claim 2
Dependent Claim
61 words
A process for preparing a nigrosine base or an induline base having improved dispersibility, fluidity and flowability in the coloring of plastics and in the preparation of inks, comprising treating a nigrosine base or induline base, at a temperature between 135° and 150° C., with between 15 and 30% by weight of phthalic anhydride, based on the weight of the base.
Claim 3
Dependent Claim
25 words
A process according to claim 1, comprising treating with said phthalic anhydride in situ said nigrosine base or induline base coming from the synthesis thereof.
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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |