US4523035A
Expired / Lapsed
US
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Process for synthesizing squaraine compositions
Assignee: Xerox Corp
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Filing: 1983-12-05
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Granted: 1985-06-11
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Expires: 2003-12-05
Abstract
Abstract A process for synthesizing a squariane composition comprising forming a mixture comprising squaric acid, a long chain primary alcohol and a tertiary amine and heating the mixture in vacuo below the boiling points of the primary alcohol and the tertiary amine to form the squariane composition.
Inventors
- 👤 John F. Yanus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:53
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/007
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A process for synthesizing a squaraine composition comprising forming a mixture comprising squaric acid, a primary alcohol having a boiling point at atmospheric pressure between about 130° C. and about 210° C. and a tertiary amine and heating said mixture in vacuo below the boiling points of said primary alcohol and said tertiary amine to form said squaraine composition.
Claim 2
Dependent Claim
59 words
A process for synthesizing a squaraine composition comprising forming a mixture comprising squaric acid, a primary alcohol having a boiling point at atmospheric pressure between about 130° C. and about 210° C. and a tertiary amine and heating said mixture in vacuo below the boiling points of said primary alcohol and said tertiary amine to form said squaraine composition.
Claim 3
Dependent Claim
26 words
A process for synthesizing squaraines according to claim 1 including heating said mixture in vacuo to a temperature between about 60° C. and about 130° C.
Claim 4
Dependent Claim
22 words
A process for synthesizing squaraines according to claim 2 wherein the pressure is maintained between about 5 torr and about 200 torr.
Claim 5
Dependent Claim
27 words
A process for synthesizing squaraines according to claim 1 wherein said long chain aliphatic alcohol has a boiling point between about 170° C. and about 185° C.
Claim 6
Dependent Claim
25 words
A process for synthesizing squaraines according to claim 3 wherein said long chain aliphatic alcohol is selected from the group consisting of 1-heptatanol and 2-ethyl-1-hexanol.
Claim 7
Dependent Claim
24 words
A process for synthesizing squaraines according to claim 1 including introducing a strong acid to said mixture prior to said heating of said solution.
Claim 8
Dependent Claim
16 words
A process for synthesizing squaraines according to claim 5 wherein said strong acid is sulfuric acid.
Claim 9
Dependent Claim
31 words
A process for synthesizing squaraines according to claim 1 wherein said mixture comprises about one mole of said squaric acid and about 2 to about 2.4 moles of said tertiary amine.
Claim 10
Dependent Claim
26 words
A process for synthesizing squaraines according to claim 1 including refluxing said mixture during said heating and removing water formed during formation of said squaraine composition.
Claim 11
Dependent Claim
83 words
A process for synthesizing squaraines according to claim 1 wherein said tertiary amine is a tertiary aniline derivative having the formula: ##STR2## wherein R 1 and R 2 are independently selected from the group consisting of an alkyl radical having from 1 to 4 carbon atoms, phenyl, benzyl and substituted benzyl derivatives, and R 3 and R 4 are independently selected from the group consisting of H, CH 3 , CH 2 CH 3 , CF 3 , F, Cl, Br and COOH.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |