US 4,045,169 AGranted

3-[3',4'-Dichloro-6'-alkyl-phenyl]-.DELTA. 2-pyrazoline derivatives and their use as optical brighteners

AssigneeHoechst Aktiengesellschaft

InventorHelmut Mengler

Life of this patent

Estimating the term…

Abstract

Novel pyrazolines are obtained by condensation of substituted propionphenones or vinyl-phenyl-ketones with substituted phenyl hydrazines. The products are useful as optical brighteners of a great variety of the shade of their fluorescence and of an improved fastness to light.

Claims9

Dependent claims

A compound of the formula ##STR14## in which R is alkyl of 1 to 4 carbon atoms and R.sub.1 is alkyl of 1 to 20 carbon atoms.

Dependencies are inferred from the claim text.

Facts

Application: 05/658,881Filed 18 Feb 1976 · division
Priority: DT 21450199 Sep 1971
Granted: 30 Aug 1977
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C07D 231/06
Not condensed with other rings: having one double bond between ring members or between a ring member and a non-ring member
D06L 4/60
Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs: optical bleaching or brightening
Y10S 8/907
Bleaching and dyeing; fluid treatment and chemical modification of textiles and fibers: nonionic emulsifiers for dyeing
Y10S 8/91
Anionic emulsifiers for dyeing: soap

Family

Serial287,075Parent of this division · filed 7 Sep 1972
Serial483,355Parent of this division · filed 26 Jun 1974
US 3,957,815 AParent of this division
3865816Parent of this division
US 4,045,169 AThis patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

patentgrep

Loading patent…

patentgrepSearch patents

Back to results