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:
Apr. 14, 1992
Filed:
Jul. 14, 1989
Eckehard Saverin, Osnabruck, DE;
Hans-Udo Tyrakowski, Hasbergen, DE;
Felix Schoeller Jr GmbH & Co. KG, Osnabruck, DE;
Abstract
The invention relates to a multifunctional back layer for a photographic element and to a coating composition for manufacturing the multifunctional layer which comprises at least four components: (a) a surface-hydroxylated aluminum-modified silica, (b) an alkali-metal salt of an organic polyacid, (c) an aqueous dispersion of copolymers of acrylic-acid-alkyl-ester including free carboxylic groups of from 1-10 mole-% and of free hydroxyl groups of from 5-20 mole-%, wherein the sum of free carboxylic groups and free hydroxy groups does not exceed 25 mole-%, and (d) a trifunctional aziridine as a cross-linking means. The multifunctional back layer of the photographic element according to the invention exhibits a low reception for dirt during passage through roller-transport developing machines, a high abrasion-proofness, wear resistance, stability in alkaline developer solutions, good printability during printing with conventional printing inks, good markability, inscriptability and lettering, as well as a good adhesive tape adhesion.