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:
Jul. 30, 1991
Filed:
Jul. 22, 1988
Gerhard Wegner, Mainz-Drais, DE;
Arend J Schouten, Peize, NL;
Gisela Duda, Mainz, DE;
Thomas Arndt, Ingelheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Thin films are produced by a process in which organic polymers having long-chain side groups are dissolved in an organic solvent, the solution is spread at the water/air interface by the Langmuir-Blodgett technique and the film is transferred onto a solid base material after evaporation of the organic solvent, and the organic polymers used are those which contain long-chain n-alkyl side groups bonded to the main chain of the polymer via polar groups, and some of these long-chain n-alkyl side groups are replaced by shorter-chain n-alkyl side groups, by branched alkyl side groups having the same or a smaller number of carbon atoms or by equally long or shorter side groups having one or more C-C multiple bonds. This process can be used to produce film elements, for example for optical filters.