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:
Oct. 22, 1985
Filed:
Mar. 19, 1984
Werner Preiswerk, Binningen, CH;
Beat Bruttel, Bockten, CH;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The invention relates to a process for the preparation of solid photoactivator formulations containing sulfonated zinc or aluminum phthalocyanines. The process comprises passing a crude solution containing these compounds through a semipermeable asymmetrical membrane having a pore diameter of 1 to 500 .ANG. and drying the photoactivator solution obtained under mild conditions. The membrane consists of a basic structure of cellulose acetate, polyacrylonitrile or a copolymer of acrylonitrile and other ethylenically unsaturated monomers. This basic structure is modified in a specific manner with ionic groups. If desired, fillers and/or surfactants customarily employed in the detergent industry may be added to the concentrated solution before it is dried. The solid photoactivator formulations so obtained have excellent storage stability, are substantially non-hygroscopic, and contain exceedingly small amounts of undesirable organic impurities.