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US 4,058,408 AGranted
Bis-benzoxazolyl-naphthalenes as optical brighteners
AssigneeCiba-Geigy Corporation
InventorHans-Rudolf Meyer
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AssigneeCiba-Geigy Corporation
InventorHans-Rudolf Meyer
Estimating the term…
The present invention relates to 1,4-bis-benzoxazolyl-(2)'-naphthalenes of the formula ##STR1## wherein R denotes optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, alkenyl with 2 to 4 carbon atoms, cycloalkyl, aryl or aralkyl, Y denotes hydrogen, alkyl with 1 to 4 carbon atoms, halogen, carboxyl, carbalkoxy with 2 to 5 carbon atoms or the radical --SO.sub.2 R', wherein R' represents optionally non-chromophorically substituted alkyl with 1 to 18 carbon atoms, cycloalkyl, alkenyl with 2 to 4 carbon atoms, aryl or aralkyl, and X and X' independently of one another denote hydrogen, chlorine or alkyl with 1 to 4 carbon atoms. These new compounds are useful as optical brighteners for organic materials, especially for polyesters, polyvinyl chloride, polystyrene, polyacrylonitrile and cellulose acetates.
Optically brightened organic material consisting essentially of organic material selected from the group consisting of polyesters, polyvinyl chloride, polystyrene, polyacrylonitrile and cellulose acetates, having applied thereto or incorporated therein 0.001 to 2 percent by weight of a compound of the formula ##STR65## wherein R.sub.1 and R.sub.1 ' independently of one another denote alkyl with 1 to 6 carbon atoms which is optionally substituted by chlorine, phenyl which is optionally substituted by chlorine or alkyl with 1 to 4 carbon atoms, or phenyl alkyl with 1 to 3 carbon atoms in the alkyl part which is optionally substituted by chlorine or methyl in the phenyl part, and
A process for optical brightening organic materials, comprising the step of applying to or incorporating in an organic material, selected from the group consisting of polyesters, polyvinyl chloride, polystyrene, polyacrylonitrile and cellulose acetates, 0.001 to 2 percent by weight of a compound of a formula ##STR70## wherein R.sub.1 and R.sub.1 ' independently of one another denote alkyl with 1 to 6 carbon atoms which is optionally substituted by chlorine, phenyl which is optionally substituted by chlorine or alkyl with 1 to 4 carbon atoms, or phenyl alkyl with 1 to 3 carbon atoms in the alkyl part which is optionally substituted by chlorine or methyl in the phenyl part, and
Dependencies are inferred from the claim text.