1970 - 1979 New fields of activity emerge in the Hoechst Works Knapsack
The production of acrylonitrile and hydrocyanic acid is terminated.
Polyolefine production in a newly commissioned plant for low-pressure polyethylene (HDPE) begins.
Dr. Hellmut Gäbler takes over the works management of Knapsack from 1 April 1970 until 1 April 1975. On 14 April 1972 he is designated as a member of the board of the Knapsack AG (Ltd.) and is named chairman of the board in 1 January 1973 and remains chairman until 8 July 1974.
The workforce grows to 5,000.
Calcium cyanamide is no longer used as a fertilizer for agriculture. The carbide furnaces 8 and 9 are shut down as well as the calcium cyanamide plant and the production of vinyl acetate.
A new production plant for the manufacturing of phosphorus intermediates is built on the works site Hürth.
First time use of the newly built center for vocational training located on the works site Hürth, where trade occupations are taught.
The construction of a chlorine hostalen and Hostalit H plant on the works site Hürth and the start of production of gypsum wallboard utilizing the gypsum from the wet broke from phosphate ores.
Farbwerke Hoechst and the company Aktiebolag found the joint venture BOLIDEN-KNAPSACK GMBH on 21 December to supply salts for dispersions e.g. for extracting phosphates from waste water.
Change of corporate form from Knapsack Aktiengesellschaft to HOECHST AKTIENGESELLSCHAFT, WERK HÜRTH.
The withdrawal from acetylene chemical production occurs by closing down the vinyl chloride 1 plant and the triumph of ethylene production takes place through the commissioning of a plant for oxychlorination of ethylene and the expansion of EDC splitting supervenes.
On 7 July there is a gas explosion in the EDC-splitting plant, whereby, fortunately, no one was injured.
Dr. Max-Rudolf Buchmann is appointed works manager of Knapsack of the Hoechst AG on 1 April 1975.
He manages the works until 30 April 1993.
Dedication of the center for education on the works site Hürth.
Expansion of the production range on the works site Hürth: commissioning of a plant for manufacturing the flame retardant ammonium polyphosphate as well as a plant for azo pigments (Hansa-yellow-pigments).
The polyethylene plant is converted to polypropylene production.
A desulfurization compound is developed and produced, which is based on carbide and used for the extraction of sulfur from steel melt.
A new field of chemical production is begun with the commissioning of the first crop protection plant PSM 1. The insecticide active agent Hostathion is the first crop protection product produced in Knapsack.
The works begins operations in a phoban plant for the production of specialty phosphorus products based on hydrogen phosphide.
The range of azo pigments is expanded to include red, Hansa and scarlet pigments.
The crop protection plant is expanded and the production of the fungicide Derosal is begun.
A second crop protection plant (PSM 2) is built and begins producing Illoxan, an herbicide that is selectively used against wild oats.
A new basic product is created in the pilot plant for organic research: MPE (Methanphosphonigsäuredichlorid / methane phosphorous acid dichloride). Both crop protection and flame retardant products are produced using this product.