The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1983
Filed:
Feb. 22, 1982
Gary T Clark, Kingsport, TN (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Disclosed is a process for the preparation of disperse dye couplers of the general formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are typical groups such as straight or branched alkylene for R.sub.1, phenyl, cyclohexyl or straight or branched substituted or unsubstituted alkyl for R.sub.2, hydrogen, lower alkyl, halogen, lower alkoxy, acylamido and the like for R.sub.3, and n is 1, 2 or 3, comprising contacting under hydrogen atmosphere a mixture of at least one amine compound of the formula ##STR2## or its nitro precursor and at least one compound of the formula ##STR3## in the presence of from about 1 to about 10 parts of a hydrogenation catalyst per part of the amine or its nitro precursor, and from about 5.3.times.10.sup.-4 to about 1.0.times.10.sup.-1 mole per mole of said amine or its nitro precursor of one or more of lower alkyl sulfonic acid or benzenesulfonic acid which may be substituted with 1-3 lower alkyl groups such as p-toluenesulfonic acid.