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:
Aug. 03, 1993
Filed:
Jan. 25, 1991
Eckehard Saverin, Osnabruck, DE;
Hans-Udo Tyrakowski, Hasbergen, DE;
Felix Schoeller Jr. GmbH & Co. K.G., Osnabruck, DE;
Abstract
A coating mass for the production of a layer on the reverse side of photographic support materials of plastic foils or plastic coated papers is particularly distinguished by extraordinarily low dirt absorption and discoloration, even from greatly aged development baths. This is obtained through a mixture of colloidal aluminum modified silica, the alkali salt of an organic polyacid, a styrene/butadiene latex with a low content of free carboxyl groups and residual monomers, and a surface tension of >45 dyn/cm. The coating mass is so composed that the dried back coating has an interfacial surface tension of >50 dyn/cm.