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:
Nov. 16, 1976
Filed:
Feb. 27, 1974
Thomas Stauner, Marly, CH;
Rainer Kitzing, Villars sur Glane, CH;
Ciba-Geigy AG, Basel, CH;
Abstract
A process for crosslinking hydrophilic colloids which contain amino, imino and/or hydroxyl groups is provided. The crosslinking agents correspond to the formula ##SPC1## Wherein A is hydrogen, hydroxyl, halogen, acylamino, an immonium-ether radical, the radical --NR.sub.1 R.sub.2 with R.sub.1 and R.sub.2 being hydrogen, alkyl, alkenyl, alkinyl, cycloalkyl, aryl, aralkyl or the nitrogen atom is part of a saturated ring which optionally contains further hetero-atoms, or the radical .sup.+NR.sub.3 R.sub.4 R.sub.5 with R.sub.3, R.sub.4 and R.sub.5 being hydrogen, alkyl, alkenyl, alkinyl, cycloalkyl, aryl, aralkyl or the nitrogen atom is part of a saturated or unsaturated ring which optionally contains further hetero-atoms, B is an ammonium or phosphonium radical and X.sup.- is an anion. The process is useful for crosslinking e.g. gelatine layers in photographic materials.