Patent US4777251A successfully refreshed from Google Patents.
US4777251A
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Process for preparing oxytitanium phthalocyanine
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-04-27
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Granted: 1988-10-11
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Expires: 2007-04-27
Abstract
Abstract An improved process for preparing oxytitanium phthalocyanine is provided wherein the condensation reaction of o-phthalodinitrile with titanium tetrachloride is effected in an organic solvent at 170 DEG to 300 DEG C. followed by hydrolysis, the improvement wherein said organic solvent is preliminarily heated at a temperature of 160 DEG to 300 DEG C. prior to initiation of the condensation reaction. The A form of oxytitanium phthalocyanine crystal can selectively be produced in the pure state.
Inventors
- 👤 Motoaki Tanaka
- 👤 Tutomu Miyagawa
- 👤 Iwao Takagishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:30
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0025; C09B67/0026; C09B47/00; C09B47/04; C09B47/06; C09B47/067
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
58 words
A process for preparing the A form crystal of oxytitanium phthlocyanine comprising effecting a condensation reaction of o-phthalodinitrile with titanium tetrachloride in an organic solvent at a temperature of 170° to 300° C. followed by hydrolysis, wherein the temperature of said organic solvent is 160° to 300° C. when the o-phthalodinitrile and titanium tetrachoride are brought into contact.
Claim 2
Dependent Claim
58 words
A process for preparing the A form crystal of oxytitanium phthlocyanine comprising effecting a condensation reaction of o-phthalodinitrile with titanium tetrachloride in an organic solvent at a temperature of 170° to 300° C. followed by hydrolysis, wherein the temperature of said organic solvent is 160° to 300° C. when the o-phthalodinitrile and titanium tetrachoride are brought into contact.
Claim 3
Dependent Claim
37 words
The process in accordance with claim 1 wherein the o-phthalodinitrile and titanium tetrachloride are added to an organic solvent which is at a temperature of 160° to 300° C., and the condensation reaction is then carried out.
Claim 4
Dependent Claim
42 words
The process in accordance with claim 1 wherein the titanium tetrachloride is added to a mixture of an organic solvent with o-phthalodinitrile, wherein the mixture is at a temperature of 160° to 300° C., and the condensation reaction is then carried out.
Claim 5
Dependent Claim
73 words
The process in accordance with claim 1 wherein a first mixture of titanium tetrachloride with a small amount of an organic solvent is added to a second mixture of an organic solvent with o-phthalodinitrile, wherein the second mixture is initially at a sufficiently high temperature such that the temperature of said second mixture after the addition of said first mixture is 160° to 300° C., and the condensation reaction is then carried out.
Claim 6
Dependent Claim
42 words
The process in accordance with claim 1 wherein the o-phthalodinitrile is added to a mixture of an organic solvent with titanium tetrachloride, wherein the mixture is at a temperature of 160° to 300° C., and the condensation reaction is then carried out.
Claim 7
Dependent Claim
35 words
The process in accordance with claim 1 wherein the A form crystal of oxytitanium phthalocyanine produced thereby shows strong diffraction peaks at Bragg angles (2θ) of 9.3° and 26.3° in the powder X-ray diffraction pattern.
Claim 8
Dependent Claim
29 words
The process in accordance with claim 1 wherein the A form crystal of oxytitanium phthalocyanine produced thereby has the powder X-ray diffraction pattern substantially as illustrated in FIG. 1.
Claim 9
Dependent Claim
19 words
The process in accordance with claim 1 wherein the temperature of said organic solvent is 170° to 250° C.
Claim 10
Dependent Claim
19 words
The process in accordance with claim 2 wherein the temperature of said organic solvent is 170° to 250° C.
Claim 11
Dependent Claim
18 words
The process in accordance with claim 3 wherein the temperature of said mixture is 170° to 250° C.
Claim 12
Dependent Claim
22 words
The process in accordance with claim 4 wherein the temperature of said second mixture after the addition is 170° to 250° C.
Claim 13
Dependent Claim
18 words
The process in accordance with claim 5 wherein the temperature of said mixture is 170° to 250° C.
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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |