GB828052A - Linear quinacridone pigments - Google Patents

Linear quinacridone pigments

Info

Publication number
GB828052A
GB828052A GB22616/56A GB2261656A GB828052A GB 828052 A GB828052 A GB 828052A GB 22616/56 A GB22616/56 A GB 22616/56A GB 2261656 A GB2261656 A GB 2261656A GB 828052 A GB828052 A GB 828052A
Authority
GB
United Kingdom
Prior art keywords
phase
salt
milling
crude
give
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB22616/56A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB828052A publication Critical patent/GB828052A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
    • C09B48/00—Quinacridones

Abstract

The invention comprises pigments which consist of or comprise quinacridones of the formula <FORM:0828052/IV(c)/1> wherein R is hydrogen, halogen, alkyl or alkoxy of 1-4 carbon atoms and which have a surface area of at least 60 square metres per gram. The invention also comprises a method of preparing the above by oxidation of the corresponding 6,13-dihydro bodies (prepared according to Specification 828,051). The substance in which R is hydrogen, i.e. quin-(2,3b)-acridine-7,14-(5,12)-dione is stated to exist in three crystal phases, a -, b -, and g -, each characterized by a particular X-ray diffraction pattern, and the invention claims these phases separately, having the surface area above referred to, and methods of producing them which are (1) production of a -phase by salt-milling or acid-pasting the crude quinacridone, (2) production of b -phase by salt-milling in presence of an aromatic or halogenated aromatic hydrocarbon; (3) production of g -phase by (a) treating the crude with dimethylformamide after salt milling, but before separating it from the salt, or (b) treating the crude with dimethyl formamide before and during salt milling. Examples describe (1) the oxidation of quin-(2,3b)-6,13-dihydro-acridine-7,14(5,12)-dione with nitrobenzene-m-sodium sulphonate in aqueous-alcoholic or -ethylene glycol solution in presence of caustic soda (other oxidizing agents specified are air and sodium polysulphide), and also (2) the saltmilling with sodium chloride, or acid-posting with sulphuric acid of the crude quinacridone so obtained to give the a -phase, (3) the salt-milling of the crude in presence of xylene to give the b -phase, and (4) the two treatments with dimethyl formamide above specified to give the gamma phase. A further example describes the manufacture of a lake from the a -phase and hydrogenated rosin by precipitation with calcium chloride from alkaline aqueous solution.
GB22616/56A 1955-07-22 1956-07-20 Linear quinacridone pigments Expired GB828052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US828052XA 1955-07-22 1955-07-22

Publications (1)

Publication Number Publication Date
GB828052A true GB828052A (en) 1960-02-10

Family

ID=22173574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22616/56A Expired GB828052A (en) 1955-07-22 1956-07-20 Linear quinacridone pigments

Country Status (1)

Country Link
GB (1) GB828052A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157659A (en) * 1959-10-10 1964-11-17 Basf Ag Process for preparing 2, 9-dichloro-quinacridone
US3257405A (en) * 1961-10-02 1966-06-21 Allied Chem Preparation of quinacridone pigments
US3264298A (en) * 1962-02-26 1966-08-02 American Cyanamid Co Quinacridone pigments
US3264300A (en) * 1963-04-30 1966-08-02 American Cyanamid Co 2, 9-dimethylquinacridone in a "yellow" crystalline form
US3272821A (en) * 1962-04-26 1966-09-13 Eastman Kodak Co Delta form of quinacridone pigment
EP0363759A2 (en) * 1988-10-12 1990-04-18 Bayer Ag Process for the manufacture of a possibly substituted quinacridone
US6402829B1 (en) 2000-12-20 2002-06-11 Sun Chemical Corporation Process for preparing a substantially pure gamma phase quinacridone pigment of large particle size

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3157659A (en) * 1959-10-10 1964-11-17 Basf Ag Process for preparing 2, 9-dichloro-quinacridone
US3257405A (en) * 1961-10-02 1966-06-21 Allied Chem Preparation of quinacridone pigments
US3264298A (en) * 1962-02-26 1966-08-02 American Cyanamid Co Quinacridone pigments
US3272821A (en) * 1962-04-26 1966-09-13 Eastman Kodak Co Delta form of quinacridone pigment
US3264300A (en) * 1963-04-30 1966-08-02 American Cyanamid Co 2, 9-dimethylquinacridone in a "yellow" crystalline form
EP0363759A2 (en) * 1988-10-12 1990-04-18 Bayer Ag Process for the manufacture of a possibly substituted quinacridone
EP0363759A3 (en) * 1988-10-12 1991-09-04 Bayer Ag Process for the manufacture of a possibly substituted quinacridone
US5093497A (en) * 1988-10-12 1992-03-03 Bayer Aktiengesellschaft Process for the preparation of a substituted or unsubstituted quinacridone
US6402829B1 (en) 2000-12-20 2002-06-11 Sun Chemical Corporation Process for preparing a substantially pure gamma phase quinacridone pigment of large particle size

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