Abstract: Mixtures of fluorescent whitening agents consisting of 51 to 98.5% by weight of 1-(4-cyanostyryl)-4-(3'-styryl)benzene, 48.5 to 1% by weight of 1-(4-cyanostyryl)-4-(2'-cyanostyryl)benzene and 0.5 to 5% by weight of 1,4-bis(cyanostyryl)benzene, a process for the preparation of said mixtures by condensing terephthalaldehyde with a 4-dialkylphosphonomethylbenzonitrile to 4-cyano-4'-formylstilbene, which is further condensed, either direct or after isolation, with a 3- and 2-dialkylphosphonomethylbenzonitrile, the use of these mixtures for whitening polyester fibers, and compositions containing said mixtures for whitening polyester fibers.
Type:
Grant
Filed:
January 25, 1988
Date of Patent:
September 19, 1989
Assignee:
Ciba-Geigy Corporation
Inventors:
Leonardo Guglielmetti, Hans R. Meyer, Dieter Reinehr, Kurt Weber
Abstract: Super paramagnetic fluids having improved thermal and oxidative stability and processes for making super paramagnetic fluids having improved thermal and oxidative stability.
Type:
Grant
Filed:
August 27, 1987
Date of Patent:
August 8, 1989
Assignees:
Hitachi Metals, Ltd., Consolidated Chemical & Consulting Co.